SU143457A1 - Device for the protection of electrical installations - Google Patents
Device for the protection of electrical installationsInfo
- Publication number
- SU143457A1 SU143457A1 SU694891A SU694891A SU143457A1 SU 143457 A1 SU143457 A1 SU 143457A1 SU 694891 A SU694891 A SU 694891A SU 694891 A SU694891 A SU 694891A SU 143457 A1 SU143457 A1 SU 143457A1
- Authority
- SU
- USSR - Soviet Union
- Prior art keywords
- protection
- transformer
- currents
- electrical installations
- phases
- Prior art date
Links
Description
Известны устройства дл защиты электрических установок or коротких замыканий в трехфазной сети с изолированной нейтралью, содержащие трехобмоточный вспомогательный трансформатор тока, первичные обмотки которого включены на разность токов двух фаз, а ко вторичной обмотке трансформатора подключено реле.Known devices for protecting electrical installations or short circuits in a three-phase network with insulated neutral, containing a three-winding auxiliary current transformer, the primary windings of which are connected to the difference of currents of two phases, and a relay connected to the secondary winding of the transformer.
Такие устройства имеют ограниченное применение, так как чувствительность их зависит от вида двухфазного короткого замыкани .Such devices have limited application, since their sensitivity depends on the type of two-phase short circuit.
Предлагаемое устройство отличаетс от известных тем, что позвол ет повысить чувствительность защиты при двухфазных коротких замыкани х . Это достигаетс тем, что обмотка реле в нем одновременно включена на сумму токов двух фаз и ток вторичной обмотки вспомогательного трансформатора, ограниченного активным сопротивлением.The proposed device differs from the known ones in that it makes it possible to increase the sensitivity of protection in case of two-phase short circuits. This is achieved by the fact that the relay winding in it is simultaneously switched on for the sum of the currents of the two phases and the secondary winding of the auxiliary transformer, limited by the active resistance.
На чертеже изображена схема предлагаемого устройства.The drawing shows a diagram of the proposed device.
Устройство содержит трехобмоточный вспомогательный трансформатор 1, сопротивление 2 и реле 3.The device contains a three-winding auxiliary transformer 1, resistance 2 and relay 3.
Первичные обмотки 4 и 5 трансформатора 1 включены на разность токов двух фаз защищаемой установки, а обмотка реле 3 включена одновременно на сумму токов тех же фаз и тока вторичной обмотки 6 трансформатора, последовательно с которой включено активное сопротивление 2.The primary windings 4 and 5 of transformer 1 are connected to the difference of the currents of the two phases of the installation to be protected, and the winding of relay 3 is turned on simultaneously for the sum of the currents of the same phases and the current of the secondary winding 6 of the transformer, in series with which active resistance 2 is connected.
Дл получени суммы токов двух фаз два трансформатора 7 и 5 тока трехфазной системы соединены в неполную звезду, а разность токов этих фаз создаетс через вспомогательный трансформатор с коэффициентом трансформации 1,73/1.To obtain the sum of the currents of the two phases, the two transformers 7 and 5 of the current of the three-phase system are connected to an incomplete star, and the difference in the currents of these phases is created through an auxiliary transformer with a transformation ratio of 1.73 / 1.
Одновременно на вспомогательном трансформаторе создаетс сдвиг фаз между токами первичных и вторичной обмоток. Необходимый фазовый сдвиг достигаетс регулированием тока намагничивани трансформатора , величина которого при данном импеданспом угле нагрузки позвол ет получать требуемый yro.i.At the same time, a phase shift between the currents of the primary and secondary windings is created on the auxiliary transformer. The required phase shift is achieved by adjusting the magnetizing current of the transformer, the value of which at a given impedance loading angle yields the required yro.i.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SU694891A SU143457A1 (en) | 1961-11-20 | 1961-11-20 | Device for the protection of electrical installations |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SU694891A SU143457A1 (en) | 1961-11-20 | 1961-11-20 | Device for the protection of electrical installations |
Publications (1)
Publication Number | Publication Date |
---|---|
SU143457A1 true SU143457A1 (en) | 1961-11-30 |
Family
ID=48299217
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SU694891A SU143457A1 (en) | 1961-11-20 | 1961-11-20 | Device for the protection of electrical installations |
Country Status (1)
Country | Link |
---|---|
SU (1) | SU143457A1 (en) |
-
1961
- 1961-11-20 SU SU694891A patent/SU143457A1/en active
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