SU699600A1 - Device for checking insulation in mains of up to 1000v with insulated neutral wire - Google Patents
Device for checking insulation in mains of up to 1000v with insulated neutral wireInfo
- Publication number
- SU699600A1 SU699600A1 SU742079132A SU2079132A SU699600A1 SU 699600 A1 SU699600 A1 SU 699600A1 SU 742079132 A SU742079132 A SU 742079132A SU 2079132 A SU2079132 A SU 2079132A SU 699600 A1 SU699600 A1 SU 699600A1
- Authority
- SU
- USSR - Soviet Union
- Prior art keywords
- relay
- insulated neutral
- insulation
- mains
- network
- Prior art date
Links
Landscapes
- Measurement Of Resistance Or Impedance (AREA)
Description
Изобретение относитс к электро технике и предназначено дл непрерывного контрол изол ции в сет х д 1000 В, работающих с изолированной нейтралью, например в .электросет х карьеров. Известно устройство контрол исправности трехфазной сети с помощью трансформаторов тока, включенных в каждую из фаз, вторичные обмотки которых соединены в одну цепь с пос ледовательно включенным в нее реле контрол исправности трехфазной сети 1 . В таких устройствах возможны лож ные срабатывани при колебани х напр жени сети. Цель изобретени - повышение дос товерности . контрол при изменени х напр жени сети. Дл этого в устройстве контрол изол ции в сет х до 1000 В с ИЗО.ПИрованной нейтралью, содержащем выпр митель, реле сопротивлени , измерительный прибор и три дроссел , параллельно обмоткам дросселей включе ны конденсаторы, параметры которых соответствуют резонансу токов по третьей гармонике в контуре дроссель -конденсатор. На чертеже схематически изображено предлагаемое устройство. Дроссели 1, 2, 3 подсоединены звездой к сети 4, нулева точка звезды через выпр митель 5, резисторы 6, 7, реле 8 с замыкающими контактами 9, 10 и измерительный прибор 11 подсоединены к земле. Конденсаторы 12, 13, 14 шунтируют обмотки дросселей 1-3. Устройство работает следующим образом . При снижении сопротивлени изол ции сети 4 ниже установ.пенного предела реле 8 срабатывает и своими контактами 9 подает сигнал снижени сопротивлени изол ции. При снижении напр жени сети, с однойстороны, ток измерительной цепи, состо щей из вкпр мителл 5, резисторов 6,7, реле 8 и прибора 11 стремитс уменьшитс , а, с другой стороны, в контурах дроссель-конденсатор резче про вл етс резонансный режим по третьей гармонике и соответственно стремитс увеличитьс ток измерительной цепи так, что в целом он остаетс посто нным. При повь ненни напр жени сети происходит противоположный процесс, и таким образом ток измерительнойThe invention relates to electrical engineering and is intended for continuous monitoring of insulation in networks of 1000 V, working with an insulated neutral, for example, in electrical grids of quarries. It is known a device for monitoring the operability of a three-phase network with the help of current transformers included in each of the phases, the secondary windings of which are connected in one circuit with a successively connected in it relay monitoring the operability of a three-phase network 1. In such devices, false positives are possible during fluctuations in network voltage. The purpose of the invention is to increase the reliability. control when the voltage of the network. For this purpose, in the device for control of insulation in networks up to 1000 V with an IZO.PIirovannaya neutral, containing rectifier, relay resistance, measuring device and three droplets parallel to the windings of chokes include capacitors whose parameters correspond to the resonance of currents on the third harmonic in the loop -capacitor. The drawing schematically shows the proposed device. The chokes 1, 2, 3 are connected by a star to the network 4, the zero point of the star through the rectifier 5, the resistors 6, 7, the relay 8 with the closing contacts 9, 10 and the measuring device 11 are connected to earth. Capacitors 12, 13, 14 shunt the windings of chokes 1-3. The device works as follows. When the insulation resistance of the network 4 is lower than the established limit of the relay, the relay 8 is activated and with its contacts 9 it gives a signal of the insulation resistance reduction. When the network voltage decreases, on the one hand, the current of the measuring circuit consisting of Mittelle Vcr 5, resistor 6,7, Relay 8 and device 11 tends to decrease, and, on the other hand, in the circuits of the choke-capacitor the resonant mode appears according to the third harmonic and, accordingly, the current of the measuring circuit tends to increase so that in general it remains constant. When the mains voltage is reversed, the opposite process occurs, and thus the measuring current
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Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SU742079132A SU699600A1 (en) | 1974-11-25 | 1974-11-25 | Device for checking insulation in mains of up to 1000v with insulated neutral wire |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SU742079132A SU699600A1 (en) | 1974-11-25 | 1974-11-25 | Device for checking insulation in mains of up to 1000v with insulated neutral wire |
Publications (1)
Publication Number | Publication Date |
---|---|
SU699600A1 true SU699600A1 (en) | 1979-11-25 |
Family
ID=20601970
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SU742079132A SU699600A1 (en) | 1974-11-25 | 1974-11-25 | Device for checking insulation in mains of up to 1000v with insulated neutral wire |
Country Status (1)
Country | Link |
---|---|
SU (1) | SU699600A1 (en) |
-
1974
- 1974-11-25 SU SU742079132A patent/SU699600A1/en active
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