How do I select a proper Prosurge SPD for my application?

Though we try our best to offer an extensive, thorough product presentation on our website, catalogs and other documents, we believe the best way for model selecting is to consult with us with your requirement and then our professional will recommend a suitable model.

What are ANSI/UL 1449 Third Edition Versus IEC 61643-1 – Key Differences In Testing

The following examines a few of the key differences between Underwriters Laboratory’s required test for surge protective devices (SPDs); ANSI/UL 1449 Third Edition and the International Electrotechnical Commission (IEC) required test for SPDs, IEC 61643-1. Short Circuit Current Rating (SCCR): The capacity of current with which the tested SPD can withstand at the terminals where connected, without breaching the enclosure in any way. UL: Tests the full product at twice the nominal voltage to see if entire product is completely offline. The entire product (as shipped) is tested; including metal oxide varistors (MOVs). IEC: Test only looks at the terminals and the physical connections to determine if they are robust enough to handle the fault. MOVs are replaced with a copper block and a manufacturer’s recommended fuse is placed in-line (external to the device). Imax: Per IEC 61643-1 – The crest value of a current through the SPD having an 8/20 waveshape and magnitude according to the test sequence of the class II operating duty test. UL: Does not recognize the need for an Imax test. IEC: An operating duty cycle test is used to ramp up to an Imax point (determined by the manufacturer). This is meant to find “blind points” within the design when subjected to a high level impulse. This is conducted as a life expectancy or robustness test. The fuse needs to withstand Imax, and the test checks thermal stability of the SPD (after each duty cycle impulse bringing the SPD up to its maximum continuous operating voltage MCOV) and its physical condition。 I nominal: The crest value of the current through the SPD having a current waveshape of 8/20. UL: I nominal test is similar to the IEC’s, however, the I nominal results do not link to a Up value (a value used internationally for electrical coordination). Instead, UL uses I nominal to determine a product’s Voltage Protection Rating (VPR). Levels are limited to a maximum of 20 kA. The SPD remains functional after 15 surges. IEC: Does not limit I nominal testing to 20kA, however, the manufacturer’s selected In level is used to get a Up value, a value considered to be the protective performance of the SPD. This value is used for electrical coordination(ratings of building wire, equipment). Therefore the goal of the manufacturer is to try to attain the highest Inominal level with the lowest Up results. Many manufactures opt to only test as high as 20 kA so they will appear to have a low Up. Class versus category UL: UL Type designation is a location designator with a difference to the way I nominal is tested (for device which provides SCCR needs to be included and survive when doing I nominal testing). IEC: Designates certain tests as a class I, II, or III. Class designation between I and II has to do with the impulse applied – Class I; an I imp test (10×350) and a class II – 8 x 20 μs. The IEC designates certain tests as a class I, II, or III and can beconfused with UL’s Type I, II, III, or IV designations. There is some validity to both identifying the product’s approved installation location (UL) and applying a more robust impulse/waveform to those products that will be installed in harsher locations (IEC). Waveforms: A graph of an impulse wave that shows its shape and changes in amplitude with time. UL: Recognizes the 8 x 20 μs waveform. IEC: The IEC incorporates 2 waveforms into their test, the 8 x 20 μs which is used for class II testing to represent surges induced onto power lines. And the 10 x 350 μs waveform which is used for class I testing that represents partial or direct lightning currents (due to building or power line strikes).The IEC also uses other ring wave type waveforms for point of use (class III) tests.

How do I know which is the correct surge protection device that must be installed?

Choosing the right surge arrester(s) is a key factor to guarantee correct protection of the installation. A poorly designed Lightning & Surge protection system may lead to early ageing of the SPD and potential failure of the protective devices in the installation allowing damage to the primary systems up stream, thus defeating the rationale behind the protection being installed Prosurge does not provide a set of rules and guides to support acorrect design of the protection system according to the application. However we follow the IEC and UL lightning and surge protection standards. With this in mind we provide a cascaded system as laid down in the rules of the standard, not the rules of Prosurge. In the field of industrial applications, a standard practice is to install a cascaded protection system based on several coordinated protective devices installed at different stages (LPZ’s). The benefit of this strategy is the fact that it allows a high discharge capacity close to the installation entrance along with a low residual voltage (level of protection) at the main incomer of installation of sensitive equipment. The design of such a protective system is, amongst other factors, based on the assessment of information such as existence of a lightning rod (Lightning Protection System) and type of incoming power supply lines, secondary primary equipment and data systems. The solutions provide protection against either Transient or Permanent (TOV) overvoltages or against both of them (T+P) simultaneously. The final product choice depends on parameters such as: type of installation, type of network disconnection (operation on MCB or RCD), auto reclosing, breaking capacity, etc. Usually you can refer IEC61643- Low-voltage surge protective devices – Part 12:Surge protective devices connected to low-voltage power distribution systems -Selection and application principles

Can lightning destroy the photovoltaic system?

Photovoltaic systems are technologically highly sensitive and a direct lightning strike would definitely destroy it. There is also yet another hazard,as a lightning strike could create surge voltage near the solar power system and these surge voltages can also destroy the system. The inverter is the primary point in need of protection. Usually, inverters will integrate surge-voltage protectors into their inverters. However, since these components only discharge small voltage peaks, you should consider using surge protective devices (SPD) in individual cases.

Are joule ratings a specification used for SPD?

In the past, some manufacturers have used joule ratings in their specifications. They are not considered a good indicator for SPD performance and not recognized by any standard organizations. Prosurge doesn’t support this specification also.

Is “Response Time”a valid specification?

Response time specifications are not supported by any standards organizations overseeing Surge Protective Devices.IEEE C62.62 Standard Test Specification for SPDs specifically mentions it should not be used as a specification.

What are the different power systems in use in the US and what are the protection needs for each?

The US power distribution system is a TN-C-S system. This implies that the Neutral and Ground conductors are bonded at the service entrance of each, and every, facility or separately derived sub-system. This means that the neutral-to-ground (N-G) protection mode within a multi-mode SPD installed at the service entrance panel is basically redundant. Further from this N-G bondpoint, such as in branch distribution panels, the need for this additional mode of protection is more warranted. In addition to the N-G protection mode, some SPDs can include line-to-neutral (L-N) and line-to-line (L-L) protection. On a three phase WYE system, the need for L-L protection is questionable as balanced L-N protection also provides a measure of protection on the L-L conductors. Changes to the 2002 edition of the National Electrical Code® (NEC®) (www.nfpa.org) have precluded the use of SPDs on ungrounded delta power distribution systems. Behind this rather broad statement is the intention that SPDs should not be connected L-G as by so doing these modes of protection are creating pseudo grounds to the floating system. Modes of protection connected L-L are however acceptable.The high-leg delta system is a grounded system and as such allows for protection modes to be connected L-L and L-N or L-G.

How does installation affect the performance of SPDs?

The installation of SPDs is often poorly understood. A good SPD, incorrectly installed, can prove of little benefit in real-life surge conditions. The very high rate-of-change of current, typical of a surge transient, will develop significant volt drops on the leads connecting the SPD to the panel or equipment being protected. This can mean higher than desired voltages reaching the equipment during such a surge condition. Prosurge suggests that measures to counteract this effect include locating the SPD so as to keep interconnecting lead lengths as short as possible, twisting these leads together. Using a heavier gauge AWG cable helps to some extent but this is only a second order effect. It is also important to keep protected and unprotected circuits and leads separate to avoid cross coupling of transient energy.

What is a practical surge rating for service entrance protection?

This is a difficult question and depends on many aspects including – site exposure, regional is okeraunic levels and utility supply. A statistical study of lightning strike probability reveals that the average lightning discharge is between 30 and 40kA, while only 10% of lightning discharges exceed 100kA. Given that a strike to a transmission feeder is likely to share the total current received into anumber of distribution paths, the reality of the surge current entering a facility can be very much less than that of the lightning strike which precipitate it. The ANSI/IEEE C62.41.1-2002 standard seeks to characterize the electrical environment at different locations throughout a facility. It defines the service entrance location as between a B and C environment, meaning that surge currents up to 10kA 8/20 can be experienced in such locations. This said,SPDs located in such environments are often rated above such levels to provide a suitable operating life expectancy, 100kA/phase being typical.

What are surges transients, and temporary over-voltages, and what are their typical characteristics?

Although often used as separate terms in the surge industry, Transients and Surges are the same phenomenon. Transients and Surges can be current, voltage, or both and can have peak values in excess of 10kA or 10kV. They are typically of very short duration (usually >10 µs & <1 ms), with a waveform that has a very rapid rise to the peak and then falls off at a much slower rate. Transients and Surges can be caused by external sources such as lightning or a short circuit, or from internal sources such as Contactor switching, Variable Speed Drives, Capacitor switching, etc. Temporary over voltages (TOVs) are oscillatory phase-to-ground or phase-to-phase over voltages that can last as little as a few seconds or as long as several minutes. Sources of TOV’s include fault reclosing, load switching, ground impedance shifts,single-phase faults and ferroresonance effects to name a few. Due to their potentially high voltage and long duration, TOV’s can be very detrimental to MOV-based SPD’s. An extended TOV can cause permanent damage to an SPD and render the unit inoperable. Note that while UL 1449 (3rd Edition) ensures that the SPD will not create a safety hazard under these conditions, SPDs are not designed to protect against TOVs.

Do SPDs protect against direct lightning strikes?

A direct lighting strike is the most powerful and difficult surge to protect against. Prosurge recommend that Proper grounding and bonding of the electrical system and employing proper surge protection can protect sensitive equipment. A SPD with a higher single surge current rating will perform best against this type of event, if the unit is properly installed and the grounding system is adequate.The maximum single withstand surge current rating is defined in IEEE SPD Standard C62.62.

What is Suppressed Voltage Rating (SVR) and Voltage Protection Rating (VPR)?

SVR was part of an earlier version of UL 1449 Edition and is no longer used in the UL 1449 standard. The SVR was replaced by VPR. VPR is part of the UL 1449 3rd Edition and is the clamping performance data for SPDs. Each SPD mode is subjected to a 6kV/3kA combination surge wave and its measured clamping value is rounded up to the nearest value based on table 63.1 from UL 1449 3rd Edition.

How are SPDs related to UL 96A?

UL 96A is the standard for Lightning Protection systems. For a building to meet UL 96A is must have a Type 1 SPD with a Nominal Discharge Current rating of 20kA installed at the service entrance.

How does a Type 1 SPD compare to a Type 2 SPD?

Some key differences between Type 1 and Type 2 SPDs are: External Overcurrent Protection. Type 2 SPDs may require external overcurrent protection or it may be included within the SPD. Type 1 SPDs generally include overcurrent protection within the SPD or other means to satisfy the requirements of the standard; thus, Type 1 SPDs and Type 2 SPDs that do not require external overcurrent protection devices eliminate the potential for installing an incorrectly rated (mismatched) overcurrent protection device with the SPD. Nominal Discharge Current Ratings. Available Nominal Discharge Current (In) ratings of Type 1 SPDs are 10 kA or 20 kA; whereas, Type 2 SPDs may have 3 kA , 5 kA, 10 kA or 20 kA Nominal Discharge Current ratings. UL 1283 EMI/RFI Filtering. Some UL 1449 Listed SPDs include filter circuits that have been evaluated as a UL 1283 (Standard for Electromagnetic Interference Filters) filter. These are complimentary UL Listed as a UL 1283 filter and a UL 1449 SPD. By definition and the scope of UL 1283, UL 1283 Listed filters are evaluated for load-side applications only, not line-side applications. Consequently, UL will not complimentary list a Type 1 SPD as a UL 1283 Listed filter. However, a Type 1 SPD might include a UL 1283 filter as a Recognized Component within a Listed Type 1 SPD, which has been fully evaluated for lineside usage. Manufacturers of such products generally offer the identical SPD as a Type 2 UL 1449 Listed SPD with complimentary Listing as a UL 1283 Listed filter. Capacitors. Capacitors utilized in Type 1 SPDs may be evaluated for safety differently than in Type 2 SPDs. All capacitors in Type 1 SPD applications are evaluated to UL 810 (Standard for Capacitors). This includes filtering capacitors referenced above in UL 1283 (Standard for Electromagnetic Interference Filters) applications. Capacitors in Type 2 SPDs are evaluated to UL 1414 (Standard for Capacitors and Suppressors for Radio- and Television-Type Appliances) and/or UL 1283 (Standard for Electromagnetic Interference Filters).

What are the UL SPD Type categories and what do they mean?

Type 1 SPDs (Listed) – Permanently connected, hard-wired SPDs intended for installation between the secondary of the service transformer and the line side of the main service equipment overcurrent protective device, as well as the load side of the main service equipment (i.e. Type 1’s can be installed anywhere within the distribution system). Type 1 SPDs include watt-hour meter socket enclosure type SPDs. Being on the line side of the service disconnect where there are no overcurrent protective devices to protect an SPD, Type 1 SPDs must be listed without the use of an external overcurrent protective device. The Nominal Discharge Current Rating for Type 1 SPDs is either 10kA or 20kA. Type 2 SPDs (Listed) – Permanently connected, hard-wired SPDs intended for installation on the load side of the main service equipment overcurrent protective device. These SPDs may also be installed at the main service equipment, but must be installed on the load side of the main service overcurrent protective device. Type 2 SPDs may or may not require an overcurrent protection device per their NRTL listing. If a specific overcurrent protection is required, the SPD’s NRTL listing file and labeling/instructions are required to note the size and type of overcurrent protective device. Note: In some cases the overcurrent protective device used can impact the nominal discharge rating of the SPD. For example, the SPD may have a 10 kA nominal discharge current rating when protected by a 30 Amp circuit breaker and a 20 kA nominal discharge current rating when protected by a different but specific make and model of overcurrent protection device. The Nominal Discharge Current Rating for Type 2 SPDs is 3 kA, 5 kA, 10 kA, or 20 kA. Type 3 SPDs (Listed) – These SPDs are called, ‘Point of Utilization SPDs’, which are to be installed at a minimum conductor length of 10 meter (30 feet) from the electrical service panel unless they are evaluated at Type 2 SPDs (that is, they receive a Nominal Discharge Current Rating of 3 kA minimum). Typically, these are cord-connected surge strips, direct plug-in SPDs, or receptacle-type SPDs installed at the utilization equipment being protected (i.e. computers, copy machines, etc.). Type 1, 2, 3 Component Assembly SPDs (Component Recognized) – These SPDs are intended to be factory installed into electrical distribution equipment or end-use equipment. These are Recognized Component SPDs evaluated for use in Type 1, 2 or 3 SPD applications. Such component SPDs must pass all the same electrical safety failure tests as listed Type 1, 2 or 3 SPDs. While these SPDs are 100% compliant from a safety failure testing point of view, these Type 1, 2 and 3 component assembly SPDs have conditions of acceptability such as exposed terminals or other mechanical construction that requires them to be installed or housed within a listed assembly to provide protection from exposure to live parts or other requirements. These Type 1, 2 or 3 Recognized Component SPDs should not be confused with ANSI/UL 1449-2006 Type 4 Component Assemblies and Type 5 discrete SPD components that require additional components (possibly safety disconnectors), design and testing in order to be used as a complete surge protective device. Type 4 Component Assembly SPD (Component Recognized) –– These component assemblies consist of one or more Type 5 SPD components together with a disconnector (integral or external) or a means of complying with the limited current tests in UL 1449, Section 39.4. These are incomplete SPD assemblies, which typically are installed in listed end-use products as long as all conditions of acceptability are met. These Type 4 component assemblies are incomplete as an SPD, require further evaluation and are not permitted to be installed in the field as a stand-alone SPD. Often, these devices require additional overcurrent protection. Type 5 SPD (Component Recognized) – Discrete component surge protection devices, such as MOVs that may be mounted on a printed wiring board, connected by its leads or provided within an enclosure with mounting means and wiring terminations. These Type 5 SPD components are incomplete as an SPD, require further evaluation and are not permitted to be installed in the field as a stand-alone SPD. Type 5 SPDs are generally the components used in the design and construction of complete SPDs or other SPD assemblies.

What is the UL Short Circuit Current Rating (SCCR)?

SSCR-Short Circuit Current Rating. The suitability of an SPD for use on an AC power circuit that is capable of delivering not more than a declared rms symmetrical current at a declared voltage during a short circuit condition. SCCR is not the same as AIC (Amp Interrupting Capacity). SCCR is the amount of “available”current that the SPD can be subjected to and safely disconnect from the power source under short circuit conditions. The amount of current “interrupted” by the SPD is typically significantly less than the “available” current. UL 1449 and the National Electric Code (NEC) require the SCCR (Short Circuit Current Rating) to be marked on all SPD units. It is not a surge rating, but the maximum allowable current a SPD can interrupt in the event of failure. The NEC/UL has a requirement that the SPD be tested and labelled with a SCCR equal to, or greater than the available fault current at that point in the system.

What is important when specifying SPD?

When specifying SPD, submit a clear, concise specification detailing the required performance and design features. A minimum specification should include: • UL surge rating • Suppression rating • Short circuit rating • Peak surge current per mode (L-N, L-G, and N-G) • voltage and configuration of electrical service

What is a Surge Protective Device or Surge Arrestor (SPD)?

SPD is a device designed to limit surge energy to electrical equipment. It does this by diverting or limiting surge current. An SPD is wired in parallel to the equipment it is intended to protect. Once the surge voltage exceeds its designed rating it “begins to clamp” and starts to conduct energy directly to the electrical grounding system. An SPD has a very low resistance during this time and “shorts” the energy to ground. Once the surge is over it “opens” up, so it does not trigger upstream circuit breakers.

FAQ - Prosurge

Q: Do SPDs protect against direct lightning strikes?

A direct lighting strike is the most powerful and difficult surge to protect against. Prosurge recommend that Proper grounding and bonding of the electrical system and employing proper surge protection can protect sensitive equipment. A SPD with a higher single surge current rating will perform best against this type of event, if the unit is properly installed and the grounding system is adequate.The maximum single withstand surge current rating is defined in IEEE SPD Standard C62.62.

Nka khetha Prosurge SPD e nepahetseng joang bakeng sa kopo ea ka?prosurge2017-10-31T17:34:33+08:00

Nka khetha Prosurge SPD e nepahetseng joang bakeng sa kopo ea ka?

Le hoja re leka ka hohle ho fana ka boitsebiso bo pharaletseng le bo hlakileng ho liwebsaeteng tsa rona, likaroloana le litokomane tse ling, re lumela hore tsela e ntle ka ho fetisisa ea ho khetha mohlala ke ho buisana le rona ka litlhoko tsa hau 'me joale setsebi sa rona se tla buella mohlala o loketseng.

Li-ANSI / UL 1449 Khatiso ea Boraro ho ea ho IEC 61643-1 - Phapang e Khōlō Ha ho Lekoaprosurge2017-10-31T17:29:56+08:00

Li-ANSI / UL 1449 Khatiso ea Boraro ho ea ho IEC 61643-1 - Phapang e Khōlō Ha ho Lekoa

Tse latelang li hlahloba liphapang tse 'maloa tsa bohlokoa lipakeng tsa teko e hlokahalang ea Underwriters Laboratory bakeng sa lisebelisoa tsa ts'ireletso (SPDs); ANSI / UL 1449 Khatiso ea Boraro le Khomishene ea Machabeng ea Electrotechnical (IEC) li hloka tlhahlobo ea li-SPD, IEC 61643-1.

Tekanyetso ea hajoale ea Potoloho e Khuts'oane (SCCR): Bokhoni ba hajoale boo SPD e lekiloeng e ka mamellang lits'oants'o moo e hokahantsoeng, ntle le ho roba sebaka ka tsela efe kapa efe.

UL: E leka sehlahisoa se felletseng ka makhetlo a mabeli matla a motlakase ho bona hore na sehlahisoa sohle ha sea fumaneha. Sehlahisoa sohle (joalo ka ha se romelloa) se ea lekoa; ho kenyeletsoa li-metal oxide varistors (MOVs).

IEC: Teko e sheba feela lits'oants'o le likhokahano tsa 'mele ho bona hore na li matla ho lekana ho sebetsana le phoso. Li-MOV li nkeloa sebaka ke `` block '' ea koporo mme fuse e khothalletsoang ke moetsi e kenngoe moleng (kantle ho sesebelisoa).

Imax: Per IEC 61643-1 - Boleng ba boleng ba hajoale ka SPD bo nang le 8/20 waveshape le boholo ho latela tatellano ea liteko tsa sehlopha sa II sa teko ea ts'ebetso.

UL: Ha e hlokomele tlhoko ea tlhahlobo ea Imax.

IEC: Teko ea potoloho ea ts'ebetso ea ts'ebetso e sebelisoa ho nyolohela ntlheng ea Imax (e khethiloeng ke moetsi). Sena se reretsoe ho fumana "lintlha tse foufetseng" ka har'a moralo ha o le tlas'a tšusumetso e phahameng. Sena se etsoa joalo ka teko ea nako ea bophelo kapa teko ea matla. Fuse e hloka ho mamella Imax, 'me liteko li lekola botsitso ba mocheso oa SPD (kamora ts'ebetso e' ngoe le e 'ngoe ea tšebetso ea ts'ebetso e tlisang SPD ho matla a eona a tsoelang pele a ts'ebetso ea MCOV) le boemo ba eona ba mmele.

Ke ipitsa ka lebitso: Boleng ba sejoale-joale ka SPD bo nang le sebopeho sa hajoale sa 8/20.

UL: Teko ea ka ea lebitso le ts'oanang le ea IEC, leha ho le joalo, sephetho sa 'na ha se amane le boleng ba Up (boleng bo sebelisitsoeng machabeng bakeng sa khokahano ea motlakase). Sebakeng seo, UL e sebelisa lebitso la ka ho khetholla sehlahisoa sa Voltage Protection Rating (VPR). Methati e lekanyelitsoe ho palo e kaholimo ho 20 kA. SPD e lula e sebetsa kamora likhahla tse 15.

IEC: Ha e lekanyetse tlhahlobo ea lebitso ho 20kA, leha ho le joalo, mochini o khethiloeng In level o sebelisetsoa ho fumana boleng ba Up, boleng bo nkuoang e le ts'ebetso e sirelletsang ea SPD. Boleng bona bo sebelisetsoa khokahano ea motlakase (lintlha tsa terata ea moaho, lisebelisoa).

Ka hona sepheo sa moetsi ke ho leka ho fumana boemo bo phahameng ka ho fetisisa ba Inominal ka liphetho tse tlase tsa Up. Lihlahisoa tse ngata li khetha ho etsa liteko feela tse ka bang 20 kA kahoo li tla bonahala li na le Up e tlase.

Sehlopha se lekanang le sehlopha

UL: UL Mofuta oa lebitso ke moqapi oa sebaka o nang le phapang ea tsela eo ke khethiloeng ka eona (bakeng sa sesebelisoa se fanang ka SCCR se hloka ho kenyelletsoa le ho phela ha ke ntse ke etsa liteko tsa lebitso)

IEC: E khetha liteko tse itseng e le sehlopha sa I, II, kapa III. Boemo ba sehlopha pakeng tsa I le II bo amana le tšusumetso e sebelisitsoeng - Sehlopha sa I; teko ea I imp (10 × 350) le sehlopha sa II - 8 x 20 μs.

IEC e hlalosa liteko tse kang sehlopha sa I, II, kapa III 'me se ka hlahisoa ka litlhaloso tsa UL's I, II, III kapa IV. Ho na le bopaki ba hore bobeli bo khetholla sebaka seo ho kenyelletsoang sehlahisoa se amohelehang ho sona (UL) le ho sebelisa boitsebiso bo matla bo feteletseng ho lihlahisoa tse tla kenngoa libakeng tse thata (IEC).

Mekhoa ea maqhubu: Graph ea leqhubu le susumetsang le bonts'ang sebōpeho sa eona le ho fetoha hoa bophahamo ka nako.

UL: E amohela sebopeho sa maqhubu a 8 x 20 μs.

IEC: IEC e kenyelletsa mefuta e 2 ea maqhubu litekong tsa bona, li-8 x 20 μs tse sebelisetsoang tlhahlobo ea sehlopha sa II ho emela li-surges tse kentsoeng likhoeleng tsa motlakase. Le mofuta oa leqhubu la 10 x 350 μs o sebelisetsoang tlhahlobo ea sehlopha sa I o emelang maqhubu a lehalima kapa a otlolohileng (ka lebaka la moaho kapa mohala oa motlakase) IEC e sebelisa mefuta e meng ea leqhubu la leqhubu bakeng sa liteko tsa tšebeliso (sehlopha sa III).

Ke tseba joang e leng sesebelisoa se nepahetseng sa ts'ireletso ea ts'ireletso se lokelang ho kengoa?prosurge2017-10-31T17:28:05+08:00

Ke tseba joang e leng sesebelisoa se nepahetseng sa ts'ireletso ea ts'ireletso se lokelang ho kengoa?

Ho khetha batšoaruoa ba nepahetseng ke ntho ea bohlokoa ho netefatsa ts'ireletso e nepahetseng ea kopo. Sesebelisoa sa tšireletso sa Lehalima le Ts'ireletso se sa sebetseng hantle se ka lebisa ho tsofaleng ha SPD le ho hloleha ha lisebelisoa tse sireletsang ho kenngweng ho lumella tšenyo ea litsamaiso tsa mantlha ho nyoloha, ka hona ho hlola mohopolo oa ts'ireletso e kenngoang

Prosurge ha e fane ka melao le litaelo tsa ho tšehetsa moqapi o sa nepahalang oa tsamaiso ea ts'ireletso ho ea ka kopo. Leha ho le joalo re latela lits'ebeletso tsa IEC le UL le litekanyetso tsa tšireletso. Re na le sena ka kelellong re fana ka tsamaiso ea cascaded e behiloeng melao ea tekanyetso, eseng melao ea Prosurge.

Lefapheng la likopo tsa liindasteri, mokhoa o tloaelehileng ke ho kenya mokhoa oa ts'ireletso ea cascaded e thehiloeng ho lisebelisoa tse 'maloa tse sirelelitsoeng tse sirelelitsoeng tse kentsoeng mekhahlelo e sa tšoaneng (LPZ). Melemo ena ke hore e lumella matla a phahameng a ho ntša metsi a haufi le ho kenngoa ha lisebelisuoa hammoho le ho theoha ha matla a motlakase (tekanyo ea ts'ireletso) mohloling o ka sehloohong oa ho kenya lisebelisoa tse mahlahahlaha.

Moqapi oa tsamaiso e joalo ea tšireletso ke, har'a lintlha tse ling, ho itšetlehile ka tlhahlobo ea tlhahisoleseling e kang ho ba le molamu oa lehalima (Lightning Protection System) le mofuta oa mehloli ea matla a kenang, lisebelisoa tse ka sehloohong le lisebelisoa tsa data.

Tharollo e fana ka tšireletso khahlanong le ho qhalana ha nako e telele kapa e sa feleng (TOV) kapa ka bobeli ba bona (T + P) ka nako e le 'ngoe.

Khetho ea ho qetela ea lihlahisoa e itšetlehile ka litekanyetso tse kang: mofuta oa ho kenngoa, mofuta oa ts'ebetso ea marang-rang (ts'ebetsong ea MCB kapa RCD), auto reclosing, ho senya matla, joalo-joalo.

Ka tloaelo o ka bua ka IEC61643- Lisebelisoa tse sireletsang matla a tlase-matla - Karolo ea 12: Lisebelisoa tse sireletsang tse hokahantsoeng le sistimi ea phepelo ea motlakase o tlase -Selection le melao-motheo ea ts'ebeliso

Na lehalima le ka senya tsamaiso ea photovoltaic?prosurge2017-10-31T17:26:31+08:00

Na lehalima le ka senya tsamaiso ea photovoltaic?

Mekhoa ea litšoantšo ea litšoantšo e na le theknoloji e tebileng haholo 'me mochine o tobileng oa lehali o tla o senya. Ho boetse ho na le kotsi e 'ngoe hape, kaha khanya ea lehalima e ka etsa hore ho be le mocheso o matla o haufi le motlakase oa letsatsi' me mekhahlelo ena e ka boela ea senya tsamaiso. Inverter ke ntlha e ka sehloohong e hlokang tšireletso. Hangata, bahlahlobisisi ba tla kenyelletsa li-protection-voltage ba sireletsang ho ba inverters. Leha ho le joalo, kaha likarolo tsena li ntša likhahla tse nyane tsa khase, u lokela ho nahana ka ho sebelisa lisebelisoa tse sireletsang (SPD) maemong ka bomong.

Na lipapali tsa lipapali li sebelisoa bakeng sa SPD?prosurge2017-10-31T17:25:41+08:00

Na lipapali tsa lipapali li sebelisoa bakeng sa SPD?

Nakong e fetileng, bahlahisi ba bang ba sebelisitse litekanyetso tsa lipapali ka litlhaloso tsa bona. Ha li nkoe e le sesuputso se setle sa ts'ebetso ea SPD ebile ha se amoheloe ke mekhatlo leha e le efe e tloaelehileng. Prosurge ha e tšehetse taba ena hape.

Na "Nako ea Karabo" ke tlhaloso e utloahalang?prosurge2017-10-31T17:24:47+08:00

Na "Nako ea Karabo" ke tlhaloso e utloahalang?

Litlhaloso tsa nako ea likarabo ha li tšehetsoe ke mekhatlo leha e le efe ea maemo e hlokomelang Matsoho a ho Sireletsa .EEE C62.62 Tlhahlobo ea Tekanyetso e Tloaelehileng bakeng sa SPDs e bolelang ka ho toba e sa lokela ho sebelisoa e le lintlha.

Ke lisebelisoa life tse fapaneng tsa motlakase tse sebelisoang US mme litlhoko tsa ts'ireletso ke life?prosurge2017-10-31T17:23:39+08:00

Ke lisebelisoa life tse fapaneng tsa motlakase tse sebelisoang US mme litlhoko tsa ts'ireletso ke life?

Tsamaiso ea tsamaiso ea matla ea US ke mokhoa oa TN-CS. Sena se bolela hore batsamaisi ba se nang lehlakore le ba se nang mobu ba kopantsoe monyako oa tšebeletso ea e mong le e mong, le mohaho o mong le o mong, kapa mohaho o mong o fumanoang o arohane. Sena se bolela hore mokhoa oa ho sireletsa o sa jeleng pahlakore (NG) ka har'a SPD ea mefuta-futa e kentsoeng lenaneng la tšebeletso ea tšebeletso ha e le hantle. Ho phaella ho sena bondpoint ea NG, e kang ea likarolo tsa ho arolelana lekala, tlhokahalo ea mokhoa ona oa ts'ireletso o eketsehileng o tiile haholoanyane. Ntle le mokhoa oa ts'ireletso oa NG, li-SPD tse ling li ka kenyelletsa line-to-neutral (LN) le ts'ireletso ea line-to-line (LL). Molaong o mong oa litekanyetso tsa WYE, tlhokahalo ea LL ts'ireletso e belaelloa e le ho sireletsa LN e leka-lekaneng hape e fana ka tekanyo ea tšireletso ho li-conductor tsa LL.
Liphetoho ho khatiso ea 2002 ea National Electrical Code® (NEC®) (www.nfpa.org) e thibelitse tšebeliso ea SPD mekhatlong ea ho tsamaisa matla a motlakase o se nang moeli. Ka morao ho polelo ena e pharaletseng ke morero oa hore SPDs e se ke ea amana le LG joalo ka ho etsa joalo mekhoa ea ts'ireletso e theha mabaka a sa utloahaleng a tsamaiso e potolohileng. Mekhoa ea tšireletso e amanang le LL e ntse e amoheleha.Le tsamaiso ea lithaba tse phahameng-leoto ke setsi sa motheo mme kahoo se lumella mekhoa ea ts'ireletso e hokahanngoa LL le LN kapa LG.

Ho kenya ho kenyeletsa ts'ebetso ea SPD joang?prosurge2017-10-31T17:19:51+08:00

Ho kenya ho kenyeletsa ts'ebetso ea SPD joang?

Ho kenngoa ha SPD hangata ha ho utloisisoe hantle. SPD e ntle, e kenngoa ka tsela e fosahetseng, e ka iponahatsa e se na molemo bophelong ba sebele ba bophelo. Lebelo le phahameng haholo la ho fetoha ha hona joale, le tloaelehileng la nakoana le ho feta, le tla hlahisa marotholi a maholo a volt marapeng a hokahanya SPD le panane kapa thepa e sirelelitsoeng. Sena se ka bolela ho feta mekhahlelo e batlang e sebelisoa ho fihlela thepa e joalo. Prosurge e fana ka maikutlo a hore mehato ea ho loantša phello ena e kenyelletsa ho fumana SPD e le ho boloka ho kopana ha bolelele ba bolelele ho feta kamoo ho ka khonehang, ho sotha tsena li tsamaisa hammoho. Ho sebelisa mohala o boima ka ho fetisisa AWG cable ho thusa ho isa bohōleng bo bong empa sena ke feela sephetho sa bobeli. Hape ke habohlokoa ho boloka lipotoloho tse sirelelitsoeng le tse sa sireletsoeng 'me li lebisa karohano ho qoba ho kopanya matla a nakoana.

Ke bokae bo sebetsang ba tšireletso ea monyako oa tšebeletso?prosurge2017-10-31T17:17:34+08:00

Ke bokae bo sebetsang ba tšireletso ea monyako oa tšebeletso?

Ena ke potso e thata 'me e itšetlehile ka lintlha tse ngata ho kenyeletsoa - ho pepesa sebaka, libaka ke maemong a okeraunic le phepelo ea thuso. Tlhahlobo ea litekanyetso tsa lehalima e senola hore khanya e tloaelehileng ea lehali e pakeng tsa 30 le 40kA, ha 10% ea lehalima e lefshoa ho feta 100kA. Kaha ho na le sepheo sa ho fepa phepelo ea phepelo ea phetisetso ho ka arolelana kakaretso eo e fumanoang hona joale ka tsela e ngata ea ho tsamaisa batho, 'nete ea hore ho hlaha hona joale ho kena setsing e ka ba ho fokolang haholo ho feta ea sekhahla sa lehalima se tla se fokotsa.

Tekanyetso ea ANSI / IEEE C62.41.1-2002 e batla ho khetholla tikoloho ea motlakase libakeng tse fapaneng ho pholletsa le setsi. E hlalosa sebaka sa ho kenella litšebeletso joalo ka lipakeng tsa tikoloho ea B le C, ho bolelang hore maqhubu a fihlang ho 10kA 8/20 a ka ba teng libakeng tse joalo. Sena se boletse, li-SPD tse fumanehang libakeng tse joalo hangata li lekantsoe kaholimo ho maemo a joalo ho fana ka nako e loketseng ea ts'ebetso ea bophelo, 100kA / mohato o tloaelehileng.

Ho na le lintho tse ling tse fokolang, le nakoana ea ho tlōla-tlōla, hona litšobotsi tsa bona tse tloaelehileng ke life?prosurge2017-10-31T17:16:14+08:00

Ho na le lintho tse ling tse fokolang, le nakoana ea ho tlōla-tlōla, hona litšobotsi tsa bona tse tloaelehileng ke life?

Le ha hangata e sebelisoa e le mantsoe a arohaneng indastering ea ts'ebetso, Transients le Surges ke ntho e ts'oanang. Linako le li-Surges li ka ba tsa hajoale, matla a motlakase, kapa ka bobeli 'me li ka ba le boleng bo holimo ho feta 10kA kapa 10kV. Hangata li na le nako e khuts'oane haholo (hangata> 10 µs & <1 ms), e nang le sebopeho sa leqhubu se nang le phahama e potlakileng haholo ebe se oela butle haholo. Linako le li-Surges li ka bakoa ke mehloli e kantle e kang lehalima kapa potoloho e khuts'oane, kapa ho tsoa mehloling e kahare e joalo ka ho ts'oana le Contactor, Variable Speed Drives, switch switch ea Capacitor, jj.

Nakoana ka nako ea li-voltages (TOVs) li na le mahlakore a mararo a marang-rang kapa a phallang ka mekhahlelo a ka qetellang ka nakoana kapa metsotso e mengata. Lisebelisoa tsa li-TOV li kenyelletsa molato oa ho khelosa, ho fetola ha mocheso, ho fetoha ha moferefere, ho etsa liphoso, le liphello tsa ferroresonance ho bolela tse 'maloa. Ka lebaka la matla a bona a phahameng a ka 'nang a e-ba teng nako e telele, li-TOV li ka ba kotsi haholo ho SPD e thehiloeng ho MOV. Tlhahiso e kholo e ka baka tšenyo ea ka ho sa feleng ho SPD 'me ea etsa hore unit e se ke ea sebetsoa. Hlokomela hore le hoja UL 1449 (Khatiso ea 3rd) e tiisa hore SPD e ke ke ea baka tšireletso tlas'a maemo ana, SPD ha e etselitsoe ho sireletsa khahlanong le litlhahiso.

Na li-SPD lia sireletsa khahlanong le liqhomane tse tobileng?prosurge2017-10-31T17:13:42+08:00

Na li-SPD lia sireletsa khahlanong le liqhomane tse tobileng?

Mohato o tobileng oa lebone ke matla a matla le a thata ho a sireletsa. Prosurge e eletsa hore ho tiisa le ho hokahanya ha motlakase tsamaiso e nepahetseng ho ka sireletsa lisebelisoa tse thata. SPD e nang le tekanyo e phahameng ea ho feta ea nako e tlang e tla sebetsa ka ho fetisisa khahlanong le mofuta ona oa ketsahalo, haeba sesebelisoa se kenngoa ka mokhoa o nepahetseng le mokhoa oa mobu o lekaneng.Moholo o motle o emeng tekanyo ea morao ea bocha o hlalosoa ho IEEE SPD Standard C62.62.

Ke eng e thibelitsoeng ho Voltage Rating (SVR) le Voltage Protection Rating (VPR)?prosurge2017-10-31T17:10:31+08:00

Ke eng e thibelitsoeng ho Voltage Rating (SVR) le Voltage Protection Rating (VPR)?

SVR e ne e le karolo ea phetolelo ea pele ea Khatiso ea UL 1449 'me ha e sa sebelisoa ka molao oa UL 1449. SVR e ile ea nkeloa sebaka ke VPR.

VPR ke karolo ea Khatiso ea UL 1449 3rd mme ke data e kenyang ts'ebetso ea SPDs. Mokhoa o mong le o mong oa SPD o behoa motsoako o kopanetsoeng oa 6kV / 3kA 'me palo ea eona ea ho khomarela e lekantsoe ho theko ea haufi e thehiloeng tafoleng 63.1 ho Khatiso ea UL 1449 3rd.

SPDs e amana joang le UL 96A?prosurge2017-10-31T17:05:54+08:00

SPDs e amana joang le UL 96A?

UL 96A ke litekanyetso tsa mekhoa ea ho sireletsa mabone. Bakeng sa mohaho o tla kopana le UL 96A o tlameha ho ba le Mofuta oa 1 SPD o nang le Nominal Discharge Hona joale palo ea 20kA e kenyelletsoeng monyako oa tšebeletso.

Mofuta oa 1 SPD o bapisoa joang le Mofuta oa 2 SPD?prosurge2017-10-31T17:01:51+08:00

Mofuta oa 1 SPD o bapisoa joang le Mofuta oa 2 SPD?

Mefuta e meng ea bohlokoa pakeng tsa Mofuta oa 1 le Mofuta oa 2 SPDs ke:

Tšireletso e Fetelletseng ea Kantle. Mofuta oa 2 SPDs o ka hloka hore o fetele holimo ka ntle
Ts'ireletso kapa e kanna ea kenyelletsoa ka har'a SPD. Mofuta oa 1 SPDs ka kakaretso o kenyelletsa
tšireletso e fetelletseng kahare ho SPD kapa mekhoa e meng ea ho khotsofatsa litlhoko
ea maemo; ka hona, Type 1 SPDs le Type 2 SPDs tse sa hlokeng kantle
Lisebelisoa tsa ts'ireletso tse fetelletseng li felisa monyetla oa ho kenya hampe
e lekantsoeng (e sa tsamaellanang) sesebelisoa sa ts'ireletso e fetelletseng le SPD.
Lintlha tsa hajoale li bolela hore na li tla tsoa joang. Ho fumaneha ha Nominal Current (In)
litekanyo tsa Mofuta oa 1 SPD ke 10 kA kapa 20 kA; athe mofuta oa 2 SPD o kanna oa ba le 3
kA, 5 kA, 10 kA kapa 20 kA Nominal Discharge litekanyetso tsa morao-rao.
Ho Filter ea UL 1283 EMI / RFI. Li-SPD tse ling tsa UL 1449 li kenyelletsa lipotoloho tsa sefa
tse lekiloeng e le UL 1283 (Standard for Electromagnetic Interference
Filters) sefahleho. Tsena ke tsa tlatsetso tsa UL tse thathamisitsoeng joalo ka sefahleho sa UL 1283 le UL
EA-1449-SPD. Ka tlhaloso le pharalla ea UL 1283, UL 1283 Lisebelisoa tse thathamisitsoeng ke
e hlahlojoe bakeng sa lits'ebetso tsa lehlakoreng la mojaro feela, eseng lits'ebetso tse lehlakoreng.
Ka lebaka leo, UL e ke ke ea fana ka lethathamo la Mofuta oa 1 SPD joalo ka lenane la UL 1283
sefa. Leha ho le joalo, Mofuta oa 1 SPD o kanna oa kenyelletsa sefahleho sa UL 1283 joalo ka Se tsejoang
Karolo e ka hare ho Lethathamo la 1 la SPD, e 'nileng ea hlahlojoa ka botlalo bakeng sa mela
tshebediso. Baetsi ba lihlahisoa tse joalo ka kakaretso ba fana ka SPD e ts'oanang le
Tšoaea 2 UL 1449 e thathamisitsoeng SPD ka Lethathamo le tlatsetsang joalo ka UL 1283 e thathamisitsoeng
filthara.
Capacitors. Li-capacitor tse sebelisitsoeng Mofuteng oa 1 SPDs li ka hlahlojoa bakeng sa polokeho
ka mokhoa o fapaneng ho fapana le Mofuta oa 2 oa li-SPD. Li-capacitor tsohle tsa likopo tsa Type 1 SPD ke
e lekanyelitsoe ho UL 810 (Standard for Capacitors). Sena se kenyelletsa ho sefa li-capacitor
e boletsoeng ka holimo ho UL 1283 (Standard for Electromagnetic Interference Filters)
ditshebediso. Li-capacitor tsa Type 2 SPDs li hlahlojoa ho UL 1414 (Standard for
Capacitors le Suppressors bakeng sa Lisebelisoa tsa Radio- le Television-Type) le / kapa
UL 1283 (Tekanyetso ea Lihlahisoa tsa Elektroniki tsa Motlakase).

Li-SPD li na le mefuta efe, hona li bolela eng?prosurge2017-10-31T16:58:48+08:00

Li-SPD li na le mefuta efe, hona li bolela eng?

Mofuta oa 1 SPDs (Lethathamong) - Li-SPD tse hoketsoeng ka ho sa feleng tse etselitsoeng
Tlhomamiso lipakeng tsa sekontiri sa sesebelisoa se fetolang le karolo ea mola
Sesebelisoa sa ts'ireletso se sirelletsang, hammoho le lehlakore la mojaro
lisebelisoa tsa ts'ebeletso (ke hore, Mofuta oa 1 o ka kengoa kae kapa kae kahara kabo
tsamaiso). Mofuta oa 1 SPDs o kenyelletsa li-SPD tsa mofuta oa sethala sa hora ea watt-hour. Ho ba holim'a
lehlakoreng la tšebeletso hakolla moo ho se nang lisebelisoa tsa ts'ireletso tse fetang
sireletsa SPD, Mofuta oa 1 SPDs o tlameha ho thathamisoa ntle le ts'ebeliso ea kantle ho feta
sesebedisoa se sireletsang. The Nominal Discharge Current Rating bakeng sa Mofuta oa 1 oa li-SPD ke
10kA kapa 20kA.

Mofuta oa 2 SPDs (Lethathamong) - Li-SPD tse hoketsoeng ka ho sa feleng tse etselitsoeng
ho hlomamisa ka lehlakoreng la mojaro oa sesebelisoa se ka sehloohong sa ts'ireletso se sirelletsang.
Li-SPD tsena li kanna tsa kenngoa lisebelisoa tsa mantlha tsa ts'ebeletso, empa li tlameha ho kengoa ho
lehlakore la mojaro oa sesebelisoa se ka sehloohong sa ts'ireletso ea ts'ireletso. Mofuta oa 2 SPDs o kanna oa ba kapa oa
ha e hloke sesebelisoa sa ts'ireletso e fetelletseng ho latela lenane la bona la NRTL. Haeba e itseng
Ho hlokahala tšireletso e fetelletseng, faele ea lenane la NRTL ea SPD le ho ngola / litaelo
ho hlokahala hore u ele hloko boholo le mofuta oa sesebelisoa se sireletsang se fetang. Tlhokomeliso: Ho tse ling
linyeoe tseo sesebelisoa se sireletsang se fetelletseng se ka amang sekhahla sa tšollo ea lebitso
SPD. Mohlala, SPD e kanna ea ba le palo ea 10 kA ea lebitso la ho ntša maemo hona joale
ha e sirelelitsoe ke setloli sa potoloho sa Amp se 30 le ea hona joale ea 20 kA ka lebitso
tekanyetso ha e sirelelitsoe ke mofuta o fapaneng empa o ikhethileng oa mofuta o fetelletseng
sesebelisoa sa ts'ireletso. The Nominal Discharge Current Rating bakeng sa Mofuta oa 2 SPDs ke 3 kA, 5
kA, 10 kA, kapa 20 kA.

Mofuta oa 3 SPDs (Lethathamong) - Li-SPD tsena li bitsoa, 'Point of Utilization SPDs', tse lokelang ho
beoa bonyane ba mokhanni o bolelele ba limithara tse 10 (maoto a 30) ho tloha motlakase
phanele ea litšebeletso ntle le haeba li ka hlahlojoa ho Mofuta oa 2 oa li-SPD (ke hore, ba amohela Nominal
Tekanyetso ea hajoale ea lero la 3 kA bonyane). Ka tloaelo, tsena ke ts'ebetso e hoketsoeng ka mohala
lihlopha, li-plug-in tse tobileng tsa plug-in, kapa li-SPD tsa mofuta oa kamohelo tse kentsoeng lisebelisoa tsa ts'ebeliso
ho sireletsoa (ke hore, likhomphutha, mechini ea likopi, jj.).

Type 1, 2, 3 Component Assembly SPDs (Component Recognised) - Tsena ke li-SPD
e reretsoeng hore e kenngoe fekthering ka thepa ea kabo ea motlakase kapa e e sebelise qetellong
lisebelisoa. Tsena ke li-SPD tse tsebahalang tse hlahlojoang hore li sebelisoe Mofuteng oa 1, 2 kapa 3
Likopo tsa SPD. Likarolo tse joalo tsa SPD li tlameha ho fetisa ts'ireletso e ts'oanang ea polokeho ea motlakase
liteko joalo ka ha li thathamisitsoe Mofuta oa 1, 2 kapa 3 SPDs. Le ha li-SPD tsena li latela 100% ho tsoa polokehong
ntlha ea tlhahlobo ea ho hloleha, li-SPD tsena tsa mofuta oa 1, 2 le 3 li na le tsona
maemo a kamohelo joalo ka lits'oants'o tse pepesitsoeng kapa kaho e ngoe ea mochini
e hlokang hore li kenngoe kapa li lule ka har'a kopano e thathamisitsoeng ho fana ka ts'ireletso
ho tloha pepeneneng ho likarolo tse phelang kapa litlhokahalo tse ling. Mofuta ona oa 1, 2 kapa 3 oa tsebahala
Li-SPD tsa likarolo ha lia lokela ho ferekanngoa le ANSI / UL 1449-2006 Type 4 Component
Likopano le Mofuta oa 5 oa likarolo tsa SPD tse hlokang likarolo tse ling
(mohlomong li-disconnect tsa polokeho), moralo le tlhahlobo e le hore li ka sebelisoa e le ts'ebetso e felletseng
sesebedisoa se sireletsang.

Mofuta oa 4 oa Seboka sa Likarolo tsa SPD (Karolo e Tsejoang) –– Karolo ena
likopano li na le mofuta o le mong kapa ho feta tsa Mofuta oa 5 SPD hammoho le hakolla
(ea bohlokoa kapa e kantle) kapa mokhoa oa ho ikamahanya le liteko tse haelloang tsa hajoale ho UL 1449
Karolo ea 39.4. Tsena ke likopano tse sa phethahalang tsa SPD, tseo hangata li kenang ho
li thathamisitse lihlahisoa tsa tšebeliso ea ho qetela hafeela maemo ohle a amohelehang a finyelloa. Mefuta ena 4
likopano tsa motsoako ha li phethehe joaloka SPD, li hloka tlhahlobo e eketsehileng 'me ha li joalo
e lumeletsoe ho kenngoa ts'imong e le SPD e ikemetseng. Hangata, lisebelisoa tsena li hloka
tšireletso e eketsehileng ka ho fetisisa.

Mofuta oa 5 SPD (Component Recognised) - Lisebelisoa tsa ts'ireletso tse ikhethileng,
joalo ka li-MOV tse ka behoang holim'a boto e hatisitsoeng ea wiring, e hokahantsoeng ke litsamaiso tsa eona kapa
ha feela ka hara sebaka se kampetsoeng se nang le mekhoa ea ho hloella le ho emisa ka mehala. Tsena Mofuta
Likarolo tsa 5 SPD ha li a phethahala joalo ka SPD, li hloka tlhahlobo e ngoe hape ha li joalo
lumelloa ho kenngoa tšimong e le SPD e ikemetseng. Mofuta oa 5 SPDs hangata ke
likarolo tse sebelisoang ho rala le ho aha li-SPD tse felletseng kapa SPD e ngoe
likopano.

Lekala le khuts'oanyane la UL lekala le leng le le leng (SCCR) ke eng?prosurge2017-10-31T16:52:02+08:00

Lekala le khuts'oanyane la UL lekala le leng le le leng (SCCR) ke eng?

Tekanyetso ea SSCR-Short Potoloho ea Hajoale. Ho tšoaneleha ha SPD bakeng sa ts'ebeliso ho potoloho ea motlakase ea AC e khonang ho fana ka li-rms tse sa lekanyetsoang tsa hajoale ka har'a voltage e phatlalalitsoeng nakong e khutšoane ea potoloho. SCCR ha e tšoane le AIC (Amp Interrupting Capacity). SCCR ke palo ea "hajoale" ea hajoale eo SPD e ka bang le eona le ho e hokahanya ka mokhoa o sireletsehileng mohloling oa motlakase tlasa maemo a potoloho e khuts'oane. Palo ea "sitisoa" ea hajoale ke SPD hangata e tlase haholo ho feta "e fumanehang" ea hajoale.

UL 1449 le National Electric Code (NEC) li hloka SCCR (Short Circuit Current Rating) hore e behoe lihlopheng tsohle tsa SPD. Hase tekanyo ea ho phalla, empa boholo bo amohelehang ba hona joale ba SPD bo ka kena-kenana le ha ho ka etsahala hore o hlōlehe. NEC / UL e na le se hlokahalang hore SPD e hlahlojoe le ho ngoloa ka SCCR e lekanang le, kapa e kholo ho feta molato o fumanehang hona joale tsamaisong ena.

Ke eng ea bohlokoa ha u hlalosa SPD?prosurge2017-10-31T16:31:39+08:00

Ke eng ea bohlokoa ha u hlalosa SPD?

Ha o hlalosa SPD, fana ka tlhaloso e hlakileng le e khutšoanyane e bontšang ts'ebetso e hlokahalang le likarolo tsa moqapi. Boitsebiso bo fokolang bo lokela ho kenyeletsa:

• Tekanyetso ea ho feta ea UL

• Ho fokotsa tekanyo

• Tekanyetso e khutšoanyane ea potoloho

• Tlhōrō ea palo e kholo ea motlakase (LN, LG, le NG)

• motlakase le tlhophiso ea tšebeletso ea motlakase

Sesebelisoa sa Ts'ireletso sa Surge kapa Surge Arrestor (SPD) ke eng?prosurge2017-10-31T16:30:05+08:00

Sesebelisoa sa Ts'ireletso sa Surge kapa Surge Arrestor (SPD) ke eng?

SPD ke sesebelisoa se lokiselitsoeng ho fokotsa matla a ho feta ho thepa ea motlakase. E etsa sena ka ho khelosa kapa ho fokotsa ho feta hona joale. SPD e ts'oaroa ka tsela e tšoanang le thepa e reretsoeng ho e sireletsa. Hang ha mocheso o phallang ho feta tekanyo ea oona o entsoeng "o qala ho koala" mme o qala ho tsamaisa matla ka ho toba tsamaisong ea motlakase. SPD e na le tšitiso e tlaase haholo nakong ena 'me "e khutsufatsa" matla a ho theoha. Hang ha ho phahama ho feta "ho bula" holimo, kahoo ha e khone ho nyoloha ka holimo ho mekhahlelo ea potoloho.