SU136813A1 - The method of protection of voltage transformers in installations for monitoring the state of isolation of the high-voltage network - Google Patents
The method of protection of voltage transformers in installations for monitoring the state of isolation of the high-voltage networkInfo
- Publication number
- SU136813A1 SU136813A1 SU641451A SU641451A SU136813A1 SU 136813 A1 SU136813 A1 SU 136813A1 SU 641451 A SU641451 A SU 641451A SU 641451 A SU641451 A SU 641451A SU 136813 A1 SU136813 A1 SU 136813A1
- Authority
- SU
- USSR - Soviet Union
- Prior art keywords
- voltage
- isolation
- state
- installations
- monitoring
- Prior art date
Links
Landscapes
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Description
При однофазных замыкани х на землю через электрическую дугу в сети с изолированной нейтралью ири погашении дуги возникает смещение нейтрали системы и по вл етс посто нна составл юща напр жени на фазах.With single-phase ground closures through an electric arc in a network with an isolated neutral and when the arc is canceled, a system neutral displacement occurs and a constant component of the voltage on the phases appears.
При наличии в такой сети трансформаторов напр жени с заземленной нейтралью (или каких-либо других индуктивностей с железо.л, включенных между фазой и землей) зар д фаз, св занный с посто нной составл ющей напр жени , стекает через обмотки трансформаторов напр жени и тем самым вызывает насыщение л елеза трансформаторов, что сопровождаетс очень большим возрастанием токов промышленной частоты. Эти токи вл ютс причиной повреждени (сгорани ) трансформаторов напр жени или срабатывани защищающих их предохранителей (в зависимости от величины токов и длительности замыкани на землю).When such a network has voltage transformers with a grounded neutral (or any other inductance with ironl connected between phase and earth), the charge of the phases associated with the constant component of the voltage flows through the windings of the voltage transformers and thereby causing saturation of the transformer's rail, which is accompanied by a very large increase in power frequency currents. These currents cause damage to the (transformed) voltage transformers or the operation of the fuses protecting them (depending on the magnitude of the currents and the duration of the earth fault).
С целью ограничени низкочастотных составл ющих тока в первичной обмотке указанных трансформаторов, предлагаетс в установке дл контрол состо ни изол ции высоковольтной сети с изолированной нейтралью применить ограничивающее активное сопротивление, включенное между нулевой точкой первичной обмотки трансформаторов и землей.In order to limit the low-frequency components of the current in the primary winding of these transformers, it is proposed in the installation to monitor the isolation state of the high-voltage network with insulated neutral to apply limiting resistance connected between the zero point of the primary winding of the transformers and ground.
На чертеже показана схема включени указанного сопротивлени R между нулевой точкой О первичной обмотки трансформатора и землей.The drawing shows the connection circuit of the indicated resistance R between the zero point O of the primary winding of the transformer and the ground.
Предмет изобретени Subject invention
Способ защиты трансформаторов напр жени в установках дл контрол состо ни изол ции высоковольтной сети с изолированной нейтралью при однофазных замыкани х на землю через электрическую дугу, отличающийс тем, что, с целью ограничени низкочастотныхA method of protecting voltage transformers in installations for monitoring the state of isolation of a high-voltage network with insulated neutral during single-phase earth faults through an electric arc, characterized in that, in order to limit low-frequency
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SU641451A SU136813A1 (en) | 1959-10-17 | 1959-10-17 | The method of protection of voltage transformers in installations for monitoring the state of isolation of the high-voltage network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SU641451A SU136813A1 (en) | 1959-10-17 | 1959-10-17 | The method of protection of voltage transformers in installations for monitoring the state of isolation of the high-voltage network |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| SU136813A1 true SU136813A1 (en) | 1960-11-30 |
Family
ID=48293063
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SU641451A SU136813A1 (en) | 1959-10-17 | 1959-10-17 | The method of protection of voltage transformers in installations for monitoring the state of isolation of the high-voltage network |
Country Status (1)
| Country | Link |
|---|---|
| SU (1) | SU136813A1 (en) |
-
1959
- 1959-10-17 SU SU641451A patent/SU136813A1/en active
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