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220KV current transformer electricity-using overcurrent protection circuit

A technology of overcurrent protection circuit and current transformer, which is applied in the direction of emergency protection circuit device, emergency protection circuit device, circuit device, etc. for limiting overcurrent/overvoltage, and can solve the problem of small absorbed power and leakage current, which cannot Ensure reliable power supply of current transformers and other issues

Inactive Publication Date: 2017-01-25
天津百利机械装备研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The absorption power and leakage current of this kind of scheme are relatively small, and it cannot guarantee the reliable power supply of the current transformer in the case of extremely short-circuit current.

Method used

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  • 220KV current transformer electricity-using overcurrent protection circuit
  • 220KV current transformer electricity-using overcurrent protection circuit
  • 220KV current transformer electricity-using overcurrent protection circuit

Examples

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Embodiment Construction

[0016] In order to further understand the invention content, characteristics and effects of the present invention, the following examples are given, and detailed descriptions are as follows in conjunction with the accompanying drawings:

[0017] see figure 1 , figure 1 It is the power supply circuit diagram of a traditional current transformer. In the traditional power supply circuit, multiple modules such as rectification, switching, control, and energy storage are arranged in sequence between the input side and the output side. To ensure the reliable operation of the above circuit.

[0018] see figure 2 and image 3 , a 220KV current transformer current overcurrent protection circuit, including: a rectifier bridge; a TVS transient voltage suppression tube D1 is arranged between the signal input end of the rectifier bridge and the power coil, and the TVS transient voltage The suppression tube D1 is used to absorb the rapidly rising voltage signal generated when the coil ...

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Abstract

The invention discloses a 220KV current transformer electricity-using overcurrent protection circuit which comprises a rectifier bridge. A TVS (transient voltage suppressor) is arranged between a signal connect-in end of the rectifier bridge and an electricity-using coil and used for absorbing quick-ascending voltage signals generated when the coil is saturated, an air discharging tube and an NMOS (n-channel metal oxide semiconductor) tube are sequentially arranged between the rectifier bridge and the electricity-using circuit, and the air discharging tube is used for releasing steady-state overhigh voltage signals; a signal output end of the rectifier bridge is electrically connected with a drain electrode and a source electrode of the NMOS tube respectively, a grid electrode of the NMOS tube is connected with one end of the electricity-using circuit through a second voltage-regulator tube, and the other end of the electricity-using circuit is connected with the grid electrode of the NMOS tube through a first voltage-regulator tube. The protection circuit does not act in a rated current mode; the protection circuit is started autonomously when a primary side has overcurrent, so that a key NMOS tube circuit, a key rectifier circuit and a voltage-regulator tube circuit are ensured to be free of overcurrent, and the protection circuit is high in starting speed and large in discharging current.

Description

technical field [0001] The invention relates to the technical field of electrical equipment, in particular to a 220KV current transformer electric overcurrent protection circuit. Background technique [0002] Taking power through the current transformer coil is an important power supply method for 220KV electronic current transformer equipment. The rated current of the primary side is generally as high as 1200A, and the power supply circuit of the current transformer coil generally adopts a PWM mode switching power supply circuit. The previous protection circuit design mainly adopts the protection scheme of AC 220V general switching power supply, especially the lightning protection scheme. The absorption power and leakage current of this kind of scheme are relatively small, and it cannot guarantee the reliable power supply of the current transformer when the current transformer is extremely short-circuited. The regulations require that when the short-circuit current on the...

Claims

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Application Information

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IPC IPC(8): H02H9/02H02H9/06
CPCH02H9/02H02H9/06
Inventor 陈星燎张舸杨宏达李亚梅王建中吕治国岳宝强张进水
Owner 天津百利机械装备研究院有限公司
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