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Dry-type air-core shunt reactor group protection sampling circuit and application thereof and protection method

A reactor group, sampling circuit technology, applied in the direction of measuring current/voltage, overload protection devices, instruments, etc., can solve the problems of overcurrent protection inaction, inter-turn insulation damage, etc.

Pending Publication Date: 2018-11-23
JILIN ELECTRIC POWER RES INST +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The technical problem to be solved by the present invention is: to provide a dry-type air-core shunt reactor group protection sampling circuit and its application and protection method, which are used to solve the dry-type air-core shunt single-phase reactor switching overvoltage in the prior art. The technical problem that the overcurrent protection does not operate after inter-turn insulation damage and inter-turn short circuit

Method used

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  • Dry-type air-core shunt reactor group protection sampling circuit and application thereof and protection method
  • Dry-type air-core shunt reactor group protection sampling circuit and application thereof and protection method
  • Dry-type air-core shunt reactor group protection sampling circuit and application thereof and protection method

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Embodiment Construction

[0061] Such as figure 1 As shown, the dry-type air-core shunt reactor group protection sampling circuit 1 is an overvoltage absorption and voltage and current signal sampling circuit, including three-phase busbars marked as A, B, and C, each phase busbar is connected with a circuit breaker, single-phase Reactors, absorbing resistors, absorbing capacitors, sampling capacitors, high-frequency protection resistors, bidirectional transient suppression diodes and low-voltage current transformers are connected in the same way,

[0062] One end of the single-phase reactor is a high-voltage end, which is connected to the busbar through a circuit breaker, and the other end of the single-phase reactor is Y-connected at the neutral point N, and the neutral point N is not grounded; the absorption resistor , absorbing capacitor and sampling capacitor are connected in series in sequence and then connected in parallel with the single-phase reactor; the high-frequency protection resistor and ...

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Abstract

The invention discloses a dry-type air-core shunt reactor group protection sampling circuit and application thereof and a protection method, which belong to the technical field of reactor overvoltageprotection. With a neutral point as reference potential, through an overvoltage absorption and power frequency voltage sampling circuit, protection on switching overvoltage is realized, and voltage signals of the reactor are extracted at the same time. Current signals flowing through the reactor are extracted through a low-voltage current sensor, and in combination of voltage signals of each reactor, resistive current and sensitive current are calculated. As a high insulation level is required for the neutral point to the ground, the insulation requirement is met when a measurement result is transmitted through an optical fiber. Thus, the switching overvoltage level of a neutral point-ungrounded dry-type air-core shunt reactor is reduced, inter-turn short circuit fault can be effectively discovered, and fire accidents are avoided.

Description

technical field [0001] The invention belongs to the technical field of single-phase reactor overvoltage protection and inter-turn short circuit protection, and in particular relates to a dry-type air-core shunt reactor group protection sampling circuit and its application and protection method. Background technique [0002] At present, dry-type air-core shunt reactors are widely used in reactive power compensation of power systems. However, in the application, the dry-type air-core shunt reactor will cause the single-phase reactor to burn out or even cause a fire accident due to inter-turn short circuit. [0003] According to the compensation requirements, the dry-type air-core shunt reactor group will be switched frequently, and the switching overvoltage is one of the main reasons for inter-turn insulation breakdown and inter-turn short circuit. After the turn-to-turn short circuit fault, the current flowing through the single-phase reactor changes very little, and the ove...

Claims

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Application Information

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IPC IPC(8): G01R1/36G01R19/25
CPCG01R1/36G01R19/2509
Inventor 赵春明王永红杨明庄羽杨代勇敖明列剑平张雷于群英林海丹朱爱军张赛鹏许文燮刘赫董洪达翟艳男
Owner JILIN ELECTRIC POWER RES INST
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