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A method for judging ct secondary side disconnection by using pulse quantity for protection device

A technology of protection device and pulse quantity, which is applied in the direction of emergency protection circuit device, measuring device, measuring electricity, etc. It can solve the problems that the protection device cannot judge the CT disconnection in time, and cannot judge the CT disconnection.

Active Publication Date: 2017-09-19
BEIJING SIFANG JIBAO AUTOMATION +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Then, if the zero-sequence current cannot exceed the fixed value of the zero-sequence starting current for 10 seconds continuously, it cannot be judged that the CT is disconnected.
The actual situation is that sometimes the CT secondary side disconnection occurs, but the protection device fails to judge the CT disconnection in time

Method used

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  • A method for judging ct secondary side disconnection by using pulse quantity for protection device
  • A method for judging ct secondary side disconnection by using pulse quantity for protection device
  • A method for judging ct secondary side disconnection by using pulse quantity for protection device

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Embodiment Construction

[0026] The technical solution of the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0027] figure 1 Schematic diagram of test wiring for generating pulses for CT secondary side disconnection.

[0028] Test equipment: 1 current booster; 1 current transformer with a CT ratio of 1500 / 1; 1 set of current test terminal blocks; 1 protection device.

[0029] Test method: Provide a large current through the current booster and add it to the primary side of the current transformer; do a CT open circuit test on the secondary side, and take the C phase open circuit as an example for the test wiring; install the current test terminal on the terminal block, and install it on the IC Do CT open circuit at the place, the open circuit gap distance can be adjusted, the maximum can reach 6mm; the secondary current loop from the current transformer is connected to the IC and IC' of the protection device; the terminals IA', IB', IC', I...

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Abstract

The invention discloses a method for a protection device to judge the disconnection of a secondary side of a CT by using the pulse quantity. The method includes the following main steps: the protection device collects the secondary current in real time during operation, when a pulse current is measured, the protection starts, and when the conditions are satisfied, it is judged that the secondary side of the CT is disconnected, and an alarm signal and an alarm message are sent out. No latching protection. This method can be used as a supplement to the original CT secondary side disconnection criterion.

Description

technical field [0001] The invention belongs to the field of electric power systems, and in particular relates to providing means for power system failure analysis, and is a method for a protection device to judge the disconnection of a CT secondary side by using the pulse amount. Background technique [0002] If the secondary side of the CT is disconnected, if it is not handled in time, the relevant protection device will not be able to collect the current of the CT open circuit phase, and it may refuse to operate when there is a fault in the area, which will expand the impact of the accident; The differential current will be measured by the dynamic protection device, and the protection device will malfunction, which also expands the impact of the accident. [0003] If the protection does not operate after the secondary side of the CT is disconnected, and fails to detect and deal with it in time, the open circuit may burn and endanger the safety of the equipment; long-term ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26G01R31/02
Inventor 赵志宏伍叶凯张月品黄少锋范暐魏会利
Owner BEIJING SIFANG JIBAO AUTOMATION