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Controllable gap, and device and method for protecting neutral point of 110KV transformer based on controllable gap

A transformer neutral point and pulse transformer technology, applied in the high-voltage field, can solve problems such as poor stability, unclear division of labor, misoperation, etc., and achieve the effect of improving stability

Inactive Publication Date: 2013-08-28
HARBIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention is to solve the poor stability of the existing discharge gap action, which leads to the problems of "refusal to operate under steady-state overvoltage" and "misoperation under transient overvoltage". In the existing 110KV transformer neutral point protection method, only Simply connect the arrester and the discharge gap in parallel, and the division of labor between the two is not clear. The existing 110KV transformer neutral point protection device has an unclear division of labor between the arrester and the discharge gap. A controllable gap and based on this can be provided. The Protection Device and Method for Realizing the Neutral Point of 110KV Transformer by Controlling the Gap

Method used

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  • Controllable gap, and device and method for protecting neutral point of 110KV transformer based on controllable gap
  • Controllable gap, and device and method for protecting neutral point of 110KV transformer based on controllable gap
  • Controllable gap, and device and method for protecting neutral point of 110KV transformer based on controllable gap

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specific Embodiment approach 1

[0023] Specific implementation mode one: see figure 1 with Figure 4 Describe this embodiment mode, a controllable gap described in this embodiment mode, which includes a controllable trigger type protection gap; the controllable trigger type protection gap is composed of an overvoltage type identification and energy storage unit 1, a trigger pulse forming unit 2 and a controlled discharge gap 3;

[0024] The identification of the overvoltage type and the energy storage unit 1 consists of a capacitor C 1 , capacitance C 2 , isolation transformer T 1 , Lightning protection resistor R 1 , full-wave rectifier bridge D 1 , current limiting protection resistor R 2 and pulse capacitor C,

[0025] The trigger pulse forming unit 2 consists of a high voltage trigger diode D 2 and pulse transformer T 2 composition,

[0026] The controlled discharge gap 3 is a three-electrode ball gap switch, and the three-electrode ball gap switch includes a first spherical electrode G 1 , th...

specific Embodiment approach 2

[0029] Specific implementation mode two: see figure 1with Figure 4 This embodiment is described. The difference between this embodiment and the controllable gap described in Embodiment 1 is that the controlled discharge gap 3 operates when the power frequency voltage value is greater than 48KV.

specific Embodiment approach 3

[0030] Specific implementation mode three: see figure 1 with Figure 4 Describe this embodiment. The difference between this embodiment and the controllable gap described in Embodiment 1 is that the controlled discharge gap 3 does not operate when the lightning impulse residual voltage is less than 146KV.

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Abstract

The invention relates to a controllable gap, and a device and method for protecting a neutral point of a 110KV transformer based on the controllable gap, and belongs to the technical field of the high voltage, solves such problems as anti-operation under the steady-state over-voltage and error operation under the transient-state over-voltage caused by the poor action stability in existing discharging gap, and solves the problem that a lightning arrester and the discharging gap in the existing protection method and protection device for the neutral point of the 110KV transformer are not clearly divided because the lightning arrester is just simply in parallel connection with the discharging gap. The method comprises the steps of: identifying the type of an over-voltage through a voltage-type identification and energy storage unit, transmitting a steady-state over-voltage to a triggering pulse forming unit through the voltage-type identification and energy storage unit when the over-voltage is a steady-state over-voltage, forming a triggering pulse signal through the triggering pulse forming unit, transmitting the triggering pulse signal to a controlled discharging gap, and enabling the controlled discharging gap to act; and enabling a zinc oxide lightning arrester (MOA) to act if the over-voltage is a transient over-voltage. The method and the device are mainly used for protecting a neutral point of the 110KV transformer.

Description

technical field [0001] The invention belongs to the technical field of high voltage. Background technique [0002] There are three main ways to protect the neutral point of transformers in the 110KV power system—arresters, discharge gaps, and arrester parallel discharge gaps. [0003] The main defect of the "surge arrester" protection method is that it cannot protect against long-lasting internal overvoltages such as power frequency overvoltages, and there is a risk of failure under relatively high power frequency overvoltages, which requires protection. Especially when non-full-phase operation occurs or the neutral point ungrounded system with single-phase grounding occurs, due to the increase in the neutral point voltage of the transformer, the surge arrester may be damaged by operating at a voltage above the rated voltage for a long time. Even cause an explosion. [0004] The main defects of the "discharge gap" protection method are: large discharge dispersion, unstable...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/04
Inventor 魏新劳聂洪岩王永红陈庆国池明赫王新宇
Owner HARBIN UNIV OF SCI & TECH
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