SU562035A1 - Method for testing secondary circuits of longitudinal differential current protection of three-winding transformers and autotransformers - Google Patents
Method for testing secondary circuits of longitudinal differential current protection of three-winding transformers and autotransformersInfo
- Publication number
- SU562035A1 SU562035A1 SU2342957A SU2342957A SU562035A1 SU 562035 A1 SU562035 A1 SU 562035A1 SU 2342957 A SU2342957 A SU 2342957A SU 2342957 A SU2342957 A SU 2342957A SU 562035 A1 SU562035 A1 SU 562035A1
- Authority
- SU
- USSR - Soviet Union
- Prior art keywords
- autotransformers
- differential current
- current protection
- secondary circuits
- longitudinal differential
- Prior art date
Links
Landscapes
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Description
тельности по предлагаемому способу нагрузку включают в каждой фазе поочередно.In accordance with the proposed method, the load is switched on in each phase alternately.
На чертеже приведен пример распределени токов в автотрансформаторе 500/220/11- 35 KB при питании со стороны среднего напр жени и замыкании на землю реактора 500 кв.The drawing shows an example of the distribution of currents in the autotransformer 500/220 / 11- 35 KB when powered from the medium-voltage side and is shorted to ground with a 500-kV reactor.
При включении несимметричной однофазной нагрузки, например реактор Р-500, в обмотках силового трансформатора и автотрансформатора по вл ютс составл ющие токов нулевой последовательности. В обмотке низшего напр жени по всем трем фазам проходит одинаковый ток, равный току нулевой последовательности, который поступает от трансформатора тока (ТТ) во вторичные цеди защиты со стороны плеча низшего напр жени . Со стороны высшего и среднего напр жени первичные токи также замер ютс соответствующими трансформаторами тока и поступают во вторичные цепи защиты. При наличии однофазной нагрузки первичные токи во всех обмотках имеют достаточное значение , обеспечивающее требуемую точность измерени токов во вторичных цеп х защиты. Вместе с тем их величина ограничена нагрузкой (Р-500) и не превышает 15-20% от их номинальных значений, что не вл етс опасным дл питающей сети и автотрансформатора .When an unbalanced single-phase load is switched on, for example, a R-500 reactor, the components of zero-sequence currents appear in the windings of the power transformer and autotransformer. In the low voltage winding, all three phases pass through the same current, equal to the zero sequence current, which comes from the current transformer (CT) to the secondary protection circuit from the side of the lower voltage arm. On the high and medium voltage side, the primary currents are also measured by the corresponding current transformers and enter the secondary protection circuits. With a single-phase load, the primary currents in all windings are of sufficient importance to ensure the required accuracy of current measurements in the secondary protection circuits. At the same time, their value is limited by the load (Р-500) and does not exceed 15-20% of their nominal values, which is not dangerous for the power supply network and the autotransformer.
Таким образом за счет включени однофазной нагрузки в обмотке низшего напр жени трансформатора и автотрансформатора по вл ютс токи нулевой последовательности, достаточные дл обеспечени требуемой точности измерени вторичных токов и напр жений в цеп х защиты, что повышает наделшость контрол схемы соединени вторичных цепей профильных дифференциальных токовых защит .Thus, due to the inclusion of a single-phase load in the low voltage winding of a transformer and an autotransformer, zero-sequence currents appear sufficient to provide the required accuracy in measuring secondary currents and voltages in protection circuits, which increases the control circuit of the secondary differential current circuits .
Claims (2)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SU2342957A SU562035A1 (en) | 1976-03-23 | 1976-03-23 | Method for testing secondary circuits of longitudinal differential current protection of three-winding transformers and autotransformers |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SU2342957A SU562035A1 (en) | 1976-03-23 | 1976-03-23 | Method for testing secondary circuits of longitudinal differential current protection of three-winding transformers and autotransformers |
Publications (1)
Publication Number | Publication Date |
---|---|
SU562035A1 true SU562035A1 (en) | 1977-06-15 |
Family
ID=20655269
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SU2342957A SU562035A1 (en) | 1976-03-23 | 1976-03-23 | Method for testing secondary circuits of longitudinal differential current protection of three-winding transformers and autotransformers |
Country Status (1)
Country | Link |
---|---|
SU (1) | SU562035A1 (en) |
-
1976
- 1976-03-23 SU SU2342957A patent/SU562035A1/en active
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