A method of preventing circuit breaker failure protection from malfunctioning based on current waveform identification

A failure protection and current waveform technology, applied in emergency protection circuit devices, electrical components, etc., can solve problems such as unfavorable dynamic stability characteristics of power systems, achieve the effects of shortening inherent action delay, good application prospects, and maintaining dynamic stability

Active Publication Date: 2018-06-29
NARI TECH CO LTD +4
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Problems solved by technology

[0005] The purpose of the present invention is to overcome the problem in the prior art that the tailing current is avoided by increasing the action delay of the failure protection to prevent the failure protection from malfunctioning, which is quite unfavorable to the maintenance of the dynamic stability characteristics of the power system operation

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  • A method of preventing circuit breaker failure protection from malfunctioning based on current waveform identification
  • A method of preventing circuit breaker failure protection from malfunctioning based on current waveform identification
  • A method of preventing circuit breaker failure protection from malfunctioning based on current waveform identification

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Embodiment Construction

[0033] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0034] Such as figure 1 As shown, the schematic diagram of the CT primary current and secondary current when the circuit breaker is closed, in order to satisfy the magnetic potential relationship, the primary alternating current enters from the CT polarity end, and the secondary induced current exits from the CT polarity end. The dotted line indicates the primary current. The principal flux, current and flux satisfy the right-hand spiral theorem.

[0035] Such as figure 2 As shown, when the circuit breaker trips, the current on the primary side of the CT is 0. Since the magnetic flux in the iron core cannot change suddenly, the secondary current will maintain the size before the circuit break...

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Abstract

The invention discloses a method based on current waveform recognition for preventing failure protection maloperation of a circuit breaker. The method can recognize tripping-off state of a switch of the circuit breaker quickly, so as to prevent maloperation of failure protection of the circuit breaker due to a tail current generated after the switch is tripped off. The recognition process takes short time, the problem of maloperation of failure protection of the circuit breaker caused by the tail current generated after the switch of the circuit breaker is tripped off under the condition of short action delay is solved, a blocking signal as a circuit breaker tripping-off recognition mark is added into the original failure logic, a deduction that the circuit breaker is tripped off is made through recognizing the tail current quickly, the failure protection logic is blocked quickly so as to prevent maloperation of the failure protection caused by the tail current; and since the recognition of the tail current logic takes short time, the inherent action delay of failure protection can be further shortened when conditions permit, the method is of positive significance in maintaining dynamic stability of power system operation, and has good application prospect.

Description

technical field [0001] The invention relates to a method for preventing malfunction protection of a circuit breaker based on current waveform identification, and belongs to the technical field of power system automation. Background technique [0002] Circuit breaker failure protection refers to a protection that can quickly trip the adjacent circuit breaker to remove the fault under the condition that the fault component protection issues a trip order and the circuit breaker body refuses to move when a fault occurs in the power system. In the power system of 220kV and above, it is equipped with circuit breaker failure protection. [0003] With the increasing complexity of the power system structure, in order to ensure the stability of the power system operation, the action delay of the failure protection is usually shorter and the return setting threshold is lower. As a result, when a fault occurs in the power system, the correct action of the fault component protection wil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/22H02H7/26
CPCH02H7/222H02H7/262
Inventor 万洛飞李志坚郑玉平潘书燕吴崇昊宋斌戴魏王寅丞白亮亮江源
Owner NARI TECH CO LTD
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