SU1471241A1 - Method for protecting insulation check voltage transformer against single-phase arc ground faults in mains with insulated neutral - Google Patents
Method for protecting insulation check voltage transformer against single-phase arc ground faults in mains with insulated neutral Download PDFInfo
- Publication number
- SU1471241A1 SU1471241A1 SU853981588A SU3981588A SU1471241A1 SU 1471241 A1 SU1471241 A1 SU 1471241A1 SU 853981588 A SU853981588 A SU 853981588A SU 3981588 A SU3981588 A SU 3981588A SU 1471241 A1 SU1471241 A1 SU 1471241A1
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- SU
- USSR - Soviet Union
- Prior art keywords
- fuse
- voltage transformer
- tnki
- mains
- resistor
- Prior art date
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Abstract
Изобретение относитс к области электротехники и предназначено дл релейной защиты трансформаторов напр жени . Цель изобретени - повышение надежности защиты. В случае возникновени сверхтоков 0,3-1,0 А и выше плавка вставка 1 начинает выгорать и при полном ее выгорании измерительна цепь трансформатора 5 напр жени контрол изол ции (ТНКИ)разорветс . При этом обмотка 4 обесточитс и контакты 3 замкнутс , подключа резистор 2 параллельно плавкой вставке, одновременно шунтиру и обмотку реле. При этом весь ток проходит от системы шин 6 через резистор 2 к ТНКИ 5, т.е. вводитс ограничивающее сопротивление, защищающее трансформатор от сверхтока и токов короткого замыкани . 1 ил.The invention relates to the field of electrical engineering and is intended for relay protection of voltage transformers. The purpose of the invention is to increase the reliability of protection. In the event of an overcurrent of 0.3-1.0 A and above, the melting insert 1 begins to burn out and, when it is completely burned out, the measuring circuit of the transformer 5 of the insulation control voltage (TNKI) will break. In this case, the winding 4 will be de-energized and the contacts 3 will be closed, connecting the resistor 2 in parallel with the fuse-link, simultaneously the shunt and the winding of the relay. In this case, all the current passes from the bus system 6 through the resistor 2 to TNKI 5, i.e A limiting resistance is introduced to protect the transformer from overcurrent and short-circuit currents. 1 il.
Description
Изобретение относитс к электротехнике , в частности к релейной защите , и может быть использовано дл защиты от повреждени трансформаторов напр жени контрол изол ции (ТНКИ) дл перемежающихс дуговых замыкани х на землю в сет х, работающих с изолированной нейтралью без компенсации емкостных токов.The invention relates to electrical engineering, in particular, to relay protection, and can be used to protect against damage to transformer isolation control voltage (TNKI) for intermittent arc ground faults in networks operating with insulated neutral without compensation of capacitive currents.
Цель изобретени - повышение надежности защиты.The purpose of the invention is to increase the reliability of protection.
На чертеже показана схема устройства , реализующего предлагаемьш способ.The drawing shows a diagram of the device that implements the proposed method.
Устройство защиты трансформатора напр жени контрол изол ции содержит плавкую вставку 1 предохранител и подключенный параллельно к ней резистор 25 причем резистор 2 подключен параллельно плавкой вставке через размыкающие контакты 3 элект- ромагнитного реле 4. Устройство защиты подключено ме оду ТНКИ 5 и .плавкой вставкой 1 предохранител , один вывод резистора 2 подключен между системой шин 6 и плавкой вставкой 1 предохранител , а второй вывод резистора 2 подключен между . таКИ 5 и обмоткой реле 4 через ее размыкающие контакты 3.The protection device of the insulation control voltage transformer contains a fuse insert 1 of the fuse and a resistor 25 connected in parallel with it and a resistor 2 connected in parallel with the fuse insert through the normally closed contacts 3 of the electromagnetic relay 4. The protection device is connected to the TNKI 5 and fuse insert 1 of the fuse , one output of the resistor 2 is connected between the bus system 6 and the fuse insert 1 of the fuse, and the second output of the resistor 2 is connected between. taki 5 and winding relay 4 through its break contacts 3.
При протекании по измерительной цепи ТНКИ 5 нормального тока пор дка 10-15 МА ток проходит через плавкую вставку 1 предохранител , обмот 4 и ТНКИ 5, при этом контак отклЕоченном состо не подключен к преку релеWhen flowing through the measuring circuit of TNKI 5 of normal current in the order of 10-15 MA, the current passes through the fuse insert 1 of the fuse, winding 4 and TNKI 5, while the contact is not connected to the relay circuit
ты 3 наход тс вyou 3 are in
НИИ и резистор 2Research institute and resistor 2
дохранителюоdohraniteluo
В случае воз1шкновени сверхтоков 0,3-1,0 А и выше плавка вставка 1 начинает выгорать и при полном ее выгорании измерительна цепь ее разорветс . При этом обмотка 4 обес- точитс и контакты 3 замкнутс , подключа резистор 2 параллельно плавкой вставке, одновременно лгунтиру и обмотку реле. При этом весь ток проходит от системы шин 6 через резистор 2 к ТНКИ 5, т.е. в цепь об- ютки ТНКИ 5 вводитс токоограничивающее .сопротивление, заащщающее трансформатор от сверхтока и токов к. 3.In the event of an overcurrent of 0.3-1.0 A and above, melting insert 1 begins to burn out and, when it is completely burned out, the measuring circuit breaks. In this case, the winding 4 is connected and the contacts 3 are closed, connecting the resistor 2 in parallel with the fuse link, at the same time it is the looser and the relay winding. In this case, all the current passes from the bus system 6 through the resistor 2 to TNKI 5, i.e A current-limiting resistance is introduced into the circuit of the TNKI 5, protecting the transformer from overcurrent and currents K. 3.
После ликвидации аварии системы шин 6 необходимо заменить перегоревшую плавкую вставку 1 предохраните- л и ток потечет через плавкую вставку .и обмотку реле 4, которое в свою очередь откроет контакты 3 и отключит сопротивление 2. При этом устройство защпы установитс в ждущем режиме до след,у1ощей аварии.After elimination of the accident of the busbar system 6, it is necessary to replace the blown fuse insert 1 and the current will flow through the fuse insert. And the winding of the relay 4, which in turn will open the contacts 3 and disconnect the resistance 2. At the same time, the pinch device will set up in standby mode the worst of the accident.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SU853981588A SU1471241A1 (en) | 1985-11-27 | 1985-11-27 | Method for protecting insulation check voltage transformer against single-phase arc ground faults in mains with insulated neutral |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SU853981588A SU1471241A1 (en) | 1985-11-27 | 1985-11-27 | Method for protecting insulation check voltage transformer against single-phase arc ground faults in mains with insulated neutral |
Publications (1)
Publication Number | Publication Date |
---|---|
SU1471241A1 true SU1471241A1 (en) | 1989-04-07 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SU853981588A SU1471241A1 (en) | 1985-11-27 | 1985-11-27 | Method for protecting insulation check voltage transformer against single-phase arc ground faults in mains with insulated neutral |
Country Status (1)
Country | Link |
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SU (1) | SU1471241A1 (en) |
-
1985
- 1985-11-27 SU SU853981588A patent/SU1471241A1/en active
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