High-voltage shunt reactor protecting method between turns

A technology of reactors and parallel connections, which is applied in the direction of emergency protection circuit devices and electrical components, can solve problems such as slow action speed, low sensitivity, and high misoperation rate, and achieve the goal of improving sensitivity and action speed, and solving sensitivity and reliability. Contradictions, the effect of preventing malfunction

Active Publication Date: 2004-11-10
NR ELECTRIC CO LTD
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Problems solved by technology

[0002] At present, there are zero-sequence current protection, zero-sequence current direction protection, zero-sequence power direction protection with fixed impedance compensation and zero-sequence impedance protection for inter-turn protection of high-voltage shunt reactors, but there

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  • High-voltage shunt reactor protecting method between turns
  • High-voltage shunt reactor protecting method between turns
  • High-voltage shunt reactor protecting method between turns

Examples

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Embodiment Construction

[0040] according to figure 1 and the above method,

[0041] The turn-to-turn short-circuit starting element has a floating threshold of phase current power frequency variation,

[0042] I 0 >kΔI t +I th

[0043] where: ΔI t It is a floating threshold, and it will gradually increase automatically as the output of the phase current variation increases. k is a certain proportional constant, which is taken as 0.2 in this example. ΔI is the half cycle integral value of the phase current, I th For a fixed threshold. The entire starting element guarantees that the zero-sequence current is greater than 0.1I e(reactor secondary rated current), the starting element can operate. This starting element is used for turn-to-turn short-circuit protection of the open reactor. It can be seen from the above action equation of the starting element that the threshold of the zero-sequence current starting element fluctuates when the reactor is air-dropped or when the line fa...

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Abstract

The invention is a turn-to-turn protecting method of high voltage parallel reactor, composed of self-adapting compensatory zero sequence power direction component, zero sequence impedance locking component, failure open component, harmonic locking component and turn-to-turn short-circuit protective starting component with phase current industrial frequency variation quantity brake and floating threshold: (1) adopting the turn-to-turn short-circuit protective starting component using phase current industrial frequency variation quantity brake and floating threshold technique; (2) when short circuit between turns occurs, for the self-adapting compensatory zero sequence power direction component, its zero sequence source is inside the reactor and zero sequence voltage is very small, in order to enhance sensitivity of short-circuit protection between turns, it compensates the zero sequence voltage; (3) the failure open component; (4) the harmonic locking component utilizes the proportional relation between industrial frequency components and other harmonics in current and voltage, and when the proportion exceeds to a certain extent, increases action delay time of short circuit between turns and reduces acting sensitivity of short-circuit protection between turns.

Description

1. Technical field [0001] The invention relates to a method for inter-turn protection of a high-voltage shunt reactor, in particular to a new method for inter-turn protection of a high-voltage shunt reactor which combines self-adaptive compensation, braking of phase current power frequency variation, and a floating threshold. 2. Background technology [0002] At present, there are zero-sequence current protection, zero-sequence current direction protection, zero-sequence power direction protection with fixed impedance compensation and zero-sequence impedance protection for inter-turn protection of high-voltage shunt reactors, but there are low sensitivity and slow action speed. Problems with high error rates: [0003] 1. Zero-sequence current protection as high-voltage shunt reactor inter-turn protection [0004] —The zero-sequence current protection is set to avoid the zero-sequence current that occurs in normal operation, and the protection band acts on tripping within a ...

Claims

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Application Information

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IPC IPC(8): H02H7/00
Inventor 陈松林王志鸿郑玉平金勇沈国荣
Owner NR ELECTRIC CO LTD
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