SU532925A1 - Device for protection against earth faults in networks with insulated and compensated neutral - Google Patents
Device for protection against earth faults in networks with insulated and compensated neutralInfo
- Publication number
- SU532925A1 SU532925A1 SU2103600A SU2103600A SU532925A1 SU 532925 A1 SU532925 A1 SU 532925A1 SU 2103600 A SU2103600 A SU 2103600A SU 2103600 A SU2103600 A SU 2103600A SU 532925 A1 SU532925 A1 SU 532925A1
- Authority
- SU
- USSR - Soviet Union
- Prior art keywords
- protection against
- insulated
- networks
- earth faults
- against earth
- Prior art date
Links
Landscapes
- Emergency Protection Circuit Devices (AREA)
Description
Известно устройство дл токовой защиты от однофазных замыканий на землю в сет х с изолированной и компенсированной нейтралью 1 .A device for current protection against single-phase earth faults in networks with insulated and compensated neutral is known.
Однако оно обладает недостаточной чувствительностью и селективностью.However, it has insufficient sensitivity and selectivity.
Известно также устройство дл защиты от замыканий на землю в электрических сет х переменного тока, содержащее двухобмоточное пол ризованное реле, рабоча обмотка которого подключена к трансформатору тока нулевой последовательности , а тормозна - через усилитель, вьшр митель и разделительньш трансформатор к фильтру напр жени пр мой последовательности 2.It is also known a device for protection against earth faults in AC power grids containing a double-winding polarized relay, the working winding of which is connected to a zero-sequence current transformer, and the brake winding through an amplifier, coupler and a splitter transformer to a direct-sequence voltage filter. 2
Это устройство также не обладает достаточной чувствительностью, так как его ток срабатывани необходимо отстраивать от бросков собственного емкостного тока, величина которых в переходном режиме однофазного замьисани на землю в несколько раз (4-60) превышает установивщиес значени . Иначе устройство может неселективно работать от тока переходного процесса.This device also does not have sufficient sensitivity, since its operation current must be rebuilt from surges of its own capacitive current, the magnitude of which in the transient single-phase wiring mode to the earth several times (4-60) exceeds the setting value. Otherwise, the device may work non-selectively from the transient current.
Целью изобретени вл етс повышение чувствительности и селективности устройства.The aim of the invention is to increase the sensitivity and selectivity of the device.
вательно соединенные усилитель и выпр митель к трансформатору тока, последовательно включенному с фильтром, настроенным на повьппенную частоту переходного процесса, причем цепь трансформатор-фильтр включена между защищаемой сетью и землей.the amplifier and the rectifier are connected to a current transformer connected in series with a filter tuned to a transient frequency, the transformer – filter circuit being connected between the protected network and the ground.
На чертеже приведена схема предложенного устройства.The drawing shows a diagram of the proposed device.
Устройство содержит фильтр 1, настроенный наThe device contains a filter 1 configured on
повьпленную частоту переходного процесса и включенный между защищаемой сетью и землей, трансформатор тока 2, последовательно включенный с фильтром 1, пол ризованные реле 3,4 с рабочими обмотками 5,6, подсоединенными через усилителиTransient frequency transient and connected between the protected network and ground, current transformer 2, connected in series with filter 1, polarized with relay 3.4 with operating windings 5.6 connected via amplifiers
7,8 и вьптр мители 9,10 ко вторичным обмоткам трансформаторов тока 11 и 12 нулевой последоваельности , установленных на защищаемых лини х 13, 14, и тормозными обмотками 15,16, подключенными через уотлитель 17 и вьшр митель 18 ко вторичной7.8 and terminal 9.10 to the secondary windings of current transformers 11 and 12 of zero sequence, installed on the protected lines 13, 14, and brake windings 15.16, connected through the heat sink 17 and the expander 18 to the secondary
обмотке трансформатора тока 2.winding current transformer 2.
В нормальном режиме реле 3,4 наход тс в исходном состо нии, т.е. их контакты разомкнуты. При возникновении однофазного замыкани на землю, например, на линии 13 в сети возникаетIn normal mode, the relay 3.4 is in the initial state, i.e. their contacts are open. When a single-phase ground fault occurs, for example, on line 13, a network appears
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SU2103600A SU532925A1 (en) | 1975-01-31 | 1975-01-31 | Device for protection against earth faults in networks with insulated and compensated neutral |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SU2103600A SU532925A1 (en) | 1975-01-31 | 1975-01-31 | Device for protection against earth faults in networks with insulated and compensated neutral |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| SU532925A1 true SU532925A1 (en) | 1976-10-25 |
Family
ID=20609579
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SU2103600A SU532925A1 (en) | 1975-01-31 | 1975-01-31 | Device for protection against earth faults in networks with insulated and compensated neutral |
Country Status (1)
| Country | Link |
|---|---|
| SU (1) | SU532925A1 (en) |
-
1975
- 1975-01-31 SU SU2103600A patent/SU532925A1/en active
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