Basic power distribution knowledge

Update date:2018-05-04 Source:MAXGE

Basic power distribution knowledge

1.Inlet cabinet

Also known as the power receiving cabinet, is used to receive electrical energy from the power grid equipment (from the incoming line to the bus), generally installed circuit breakers, CT, PT, isolation knives and other components.

2. Outlet cabinet

Also known as feeder cabinet or distribution cabinet, is used to allocate electrical energy equipment (from the bus to the various outlets), generally also installed circuit breakers, CT, PT, isolation knives and other components.

3.Busbar cabinet

Also called the busbar disconnecting cabinet, it is used to connect two busbars (from busbars to busbars). Busbars are often used in single busbar subsection and double busbar systems to meet the requirements or guarantees of different operating modes for users. Selective removal load under fault conditions.

 968/5000 Xuánzhuǎn kāiguān yòu jiào shòu diàn guì, shìyòng lái cóng diàn wǎngshàng jiēshòu diànnéng de shèbèi (cóng jìn xiàn dào mǔxiàn), yībān ānzhuāng yǒu duànlù qì,CT,PT, gélí dāo děng yuán qìjiàn.  2. Chūxiàn guì  yě jiào kuì diàn guì huò pèi diàn guì, shì yòng lái fēnpèi diànnéng de shèbèi (cóng mǔxiàn dào gège chūxiàn), yībān yě ānzhuāng yǒu duànlù qì,CT,PT, gélí dāo děng yuán qìjiàn.  3. Mǔxiàn liánluò guì  yě jiào mǔxiàn fēnduàn guì, shì yòng lái liánjiē liǎng duàn mǔxiàn de shèbèi (cóng mǔxiàn dào mǔxiàn), zài dān mǔxiàn fēnduàn, shuāng mǔxiàn xìtǒng zhōng chángcháng yào yòng dào mǔxiàn liánluò, yǐ mǎnzú yònghù xuǎn zhái bu tóng yùnxíng fāngshì de yāoqiú huò bǎozhèng gùzhàng qíngkuàng xià yǒu xuǎnzé de qiēchú fùhè.  4.PT guì  diànyā hùgǎn qì guì, yībān shì zhíjiē zhuāng shè dào mǔxiàn shàng, yǐ jiǎncè mǔxiàn diànyā hé shíxiàn bǎohù gōngnéng. Nèibù zhǔyào ānzhuāng diànyā hùgǎn qì PT, gélí dāo, róngduàn qì hé bìléiqì děng.  5. Gélí guì  shì yòng lái gélí liǎng duān mǔxiàn yòng de huòzhě shì gélí shòu diàn shèbèi yǔ gōngdiàn shèbèi yòng de, tā kěyǐ gěi yùnxíng rényuán tígōng yīgè kějiàn de duāndiǎn, yǐ fāngbiàn wéihù hé jiǎnxiū zuòyè. Yóuyú gélí guì bù jùyǒu fèn duàn, jiē tōng fùhè diànliú de nénglì, suǒyǐ zài yǔqí pèihé de duànlù qì bìhé de qíngkuàng xià, bùnénggòu tuīlā gélí guì de shǒu chē. Zài yībān de yìngyòng zhōng, dōu xūyào shèzhì duànlù qì fǔzhù jiēdiǎn yǔ gélí shǒu chē de lián suǒ, fángzhǐ yùnxíng rényuán de wù cāozuò.  6. Gélí dāo zhá  gélí dāo zhá (huò chēng gélí kāiguān) yóuyú yǒu míngxiǎn de duànkǒu kěyǐ shìbié jiē tōng huò fēnduàn, zhǔyào shi yòng lái gélí gāoyā diànyuán de, yǐ bǎozhèng xiànlù hé shèbèi de ānquán jiǎnxiū, néng fēnduàn de diànliú hěn xiǎo (yībān zhǐyǒu jǐ gè ānpéi). Yóuyú méiyǒu zhuānmén de miè hú zhuāngzhì, suǒyǐ tā bù néng yòng lái fēnduàn gùzhàng diànliú hé zhèngcháng gōngzuò diànliú, bù yǔnxǔ dài fùhè jìn háng fēnduàn cāozuò.  7. Róngduàn qì  róngduàn qì shì yī zhǒng jiǎndān de diànlù bǎohù diànqì, qí yuánlǐ shì dāng liú jīng róngduàn qì de diànliú dádào huò chāoguò dìng zhí yīdìng shíjiān hòu, běnshēn de róng tǐ rónghuà, qiēduàn diànlù. Qí dòngzuò yuánlǐ jiǎndān, ānzhuāng fāngbiàn, yībān bù dāndú shǐyòng, zhǔyào yòng lái pèihé qítā diànqì shǐyòng.  8. Jiēchù qì  jiēchù qì shì yī zhǒng yòng yú yuǎn jùlí pínfán jiē tōng hé kāi duànjiāo zhíliú zhǔ diànlù jí dà róngliàng kòngzhì diànlù de diànqì, zhǔyào kòngzhì duìxiàng shì diàndòngjī, zhàomíng, diànróngqì zǔ děng, fēn jiāoliú jiēchù qì hé zhíliú jiēchù qì. Yǔ duànlù qì xiāng bǐ, bùtóng zhī chù zàiyú: Dòngzuò pínlǜ fēicháng gāo (yīncǐ yāoqiú qí diànqì shòumìng hé jīxiè shòumìng zúgòu zhǎng); yǒu jiào gāo de de kāi duàn hé jiē tōng róngliàng, dànshì yībān yòng zài 1kV jí yǐxià de diànyā děngjí zhōng, wúfǎ yǔ duànlù qì de jǐ shíqiān fú, jǐ bǎi qiān fú xiāng bǐ.  9. Jìdiànqì  jìdiànqì shì yòng lái zài kòngzhì huílù zhōng kòngzhì qítā diànqì (yībān shì yīcì diànqì zhǔ shèbèi) dòngzuò huò zài zhǔ diànlù zhōng zuòwéi bǎohù yòng yǐjí zuò xìnhào zhuǎnhuàn yòng de diànqì, zhǐ shì yòng yú yuǎn jùlí de fēnduàn, jiē tōng xiǎo róngliàng kòngzhì huílù, bǐrú: Jiāoliú/zhíliú diànliú jìdiànqì, diànyā jìdiànqì, shíjiān jìdiànqì, zhōngjiān jìdiànqì, rè jìdiànqì děng. Rotary switch

4. PT cabinet

Voltage transformer cabinets are generally installed directly on bus bars to detect bus voltage and achieve protection functions. Mainly installed inside the voltage transformer PT, isolation knives, fuses and arresters.

5. Separate cabinet

It is used to isolate the busbars at both ends or to isolate the power-receiving equipment and the power supply equipment. It can provide the operating personnel with a visible endpoint to facilitate maintenance and inspection operations. Because the isolation cabinet does not have the ability to break and connect the load current, it cannot push and pull the handcart of the isolation cabinet when the circuit breaker with which it is fitted is closed. In general applications, it is necessary to provide an interlock between the auxiliary contact of the circuit breaker and the isolated handcart to prevent misoperation of the operating personnel.

6. Isolate the knife gate

Isolation switch (or isolation switch) can identify the connection or disconnect due to the obvious fracture, is mainly used to isolate the high voltage power supply, to ensure the safety of the line and equipment maintenance, the current can be broken very small (usually only a few ampere). Since there is no special arc extinguishing device, it cannot be used to break fault current and normal operating current, and it is not allowed to carry out breaking operation with a load.

Fuse

7. Fuse

A fuse is a simple circuit protection device. The principle is that when the current flowing through the fuse reaches or exceeds a certain value for a certain period of time, the melt itself melts and the circuit is cut off. Its principle of operation is simple, easy to install, generally not used alone, mainly used with other electrical appliances.

8. Contactor

Contactor is a kind of electrical appliance used for long-distance frequent turning on and off of AC and DC main circuit and large capacity control circuit. The main control object is motor, lighting, capacitor bank, etc., and AC contactor and DC contactor. Compared with the circuit breaker, the difference is: the operating frequency is very high (thereby requiring its electrical and mechanical life long enough); have a high breaking and switching capacity, but generally used in voltage levels of 1kV and below It cannot be compared with the tens of kilovolts and hundreds of kilovolts of circuit breakers.

Surge protector

9. Relay

Relays are used to control the operation of other electrical equipment (usually an electrical main equipment) in the control loop or as a protection and signal conversion appliance in the main circuit. They are only suitable for remote disconnecting and switching on small-capacity control loops. For example: AC/DC current relays, voltage relays, time relays, intermediate relays, thermal relays, etc.

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