SU656143A1 - Device for protecting three-phase network with consumer from earth fault - Google Patents
Device for protecting three-phase network with consumer from earth faultInfo
- Publication number
- SU656143A1 SU656143A1 SU731903567A SU1903567A SU656143A1 SU 656143 A1 SU656143 A1 SU 656143A1 SU 731903567 A SU731903567 A SU 731903567A SU 1903567 A SU1903567 A SU 1903567A SU 656143 A1 SU656143 A1 SU 656143A1
- Authority
- SU
- USSR - Soviet Union
- Prior art keywords
- consumer
- protecting
- earth fault
- phase network
- network
- Prior art date
Links
Landscapes
- Emergency Protection Circuit Devices (AREA)
Description
Изобретение относитс к области защиты от поражени электротоком н опасных утечек тока на землю, преимущественно дл подземных электрических сетей с изолированной нейтралью трансформатора.The invention relates to the field of protection against electric shock and dangerous leakage of current to earth, mainly for underground electrical networks with insulated transformer neutral.
Известны устройства защиты от утечек тока на землю 1, 2. Из известных устройств наиболее близким по технической сущности к данному изобретению вл етс устройство, описанное в 2. Оно содержит источник посто нного оперативного тока, в качестве которого используетс трехфазный полупроводниковый выпр митель, один полюс которого через токоограничивающий резистор соединен с землей. Измерительное реле с помощью фильтра присоединени , образованного трем резисторами, подключено между сетью и землей параллельно источнику оперативного тока.The devices for protection against leakage of current to the earth 1, 2 are known. Of the known devices, the closest to the technical essence of this invention is the device described in 2. It contains a source of constant operating current, which uses a three-phase semiconductor rectifier, one pole which through the current limiting resistor is connected to ground. The measuring relay is connected via a junction filter formed by three resistors between the network and the ground in parallel with the operating current source.
Это устройство обладает высокой чувствительностью и самоконтролем исправности элементов схемы. Однако ему присущ существенный недостаток: оно не в состо нии обеспечить контроль сопротивлени изол ции в отключенной сети. В результате этогоThis device has a high sensitivity and self-monitoring of the health of the circuit elements. However, it has a significant drawback: it is not able to provide control of the insulation resistance in a disconnected network. As a result
возможна подача напр жени на сеть с поврежденной изол цией.voltage supply to the network with damaged insulation is possible.
Даже кратковременное включение сети с поврежденной изол цией токоведущих проводников в щахтных услови х св зано с опасностью пopaжeIи электротоком, пожаром или взрывом газа метана.Even short-term switching on of the network with damaged insulation of current-carrying conductors in the field conditions is associated with the danger of electric shock, fire or explosion of methane gas.
Целью насто щего изобретени вл етс устранение указанных недостатков.The purpose of the present invention is to eliminate these drawbacks.
Устройство защиты от утечек тока на землю осуществл ет контроль сопротивлени изол ции отключенной кабельной сети и не позвол ет включение коммутационного аппарата (автоматического выключател , магнитного пускател и пр.), если сопротиБление изол ции, подлежащей включению сети, ниже допустимой величины.The earth leakage protection device monitors the insulation resistance of the disconnected cable network and does not allow the switching apparatus (circuit breaker, magnetic starter, etc.) to be turned on if the insulation resistance to be switched on is less than the permissible value.
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SU731903567A SU656143A1 (en) | 1973-04-10 | 1973-04-10 | Device for protecting three-phase network with consumer from earth fault |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SU731903567A SU656143A1 (en) | 1973-04-10 | 1973-04-10 | Device for protecting three-phase network with consumer from earth fault |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| SU656143A1 true SU656143A1 (en) | 1979-04-05 |
Family
ID=20548327
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SU731903567A SU656143A1 (en) | 1973-04-10 | 1973-04-10 | Device for protecting three-phase network with consumer from earth fault |
Country Status (1)
| Country | Link |
|---|---|
| SU (1) | SU656143A1 (en) |
-
1973
- 1973-04-10 SU SU731903567A patent/SU656143A1/en active
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