A protection starting method and device based on transient quantity
A technology for protecting start-up and transient quantities, applied to emergency protection circuit devices, parts of emergency protection devices, circuit devices, etc., can solve hardware sampling circuit noise interference, reduce reliability of relay protection, and fail to meet rapid fault removal and other problems to achieve the effect of eliminating interference and improving reliability
Active Publication Date: 2019-07-23
河南许继继保电气自动化有限公司 +3
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Problems solved by technology
[0003] The traditional relay protection device only relies on power frequency to start protection, and its sampling frequency is generally not higher than 10kHz. The noise interference introduced by the hardware circuit to the device can basically be ignored, but it cannot meet the requirements of rapid fault removal under some working conditions
[0004] Transient protection is a relay protection device based on high-frequency transients generated by fault detection. Its sampling frequency is generally greater than 500kHz. At this time, the noise of the hardware sampling circuit will cause serious interference and even reduce the relay protection. reliability of protection
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[0039] The invention provides a protection starting method and device based on transient quantity, which are used to improve the reliability of relay protection of electric power system.
[0040] To achieve the above object, the technical solution provided by the invention is:
[0041] A protection starting method based on transient quantity, comprising the following steps:
[0042] (1) Sampling the transient current in the protected system;
[0043] (2) According to the data obtained by sampling, the differential current of each phase is obtained, and the differential current between each phase is calculated according to the differential current of each phase;
[0044] (3) According to the variation of the differential current between the phases, when the variation of the differential current between the phases is greater than the set value, it is judged that the relay protection needs to be started;
[0045] The absolute value of the differential current between one of the...
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The invention provides a transient quantity based protection starting method and device. The protection starting method comprises the following steps: a transient current in a protected system is sampled; a differential current of each phase according to data obtained via sampling operation is obtained, and all differential currents between phases are calculated according to the differential current of each phase; according to an amount of change of all the differential currents between the phases, that relay protection needs to be started is determined when the amount of change of any differential current between the phases is greater than a set value. Via the transient quantity based protection starting method and device provided in the invention, a transient quantity in a protected system can be solved in a differential manner, whether the relay protection needs to be started is determined according to the amount of change of all the differential currents between the phases, interference caused by noise of a hardware sampling loop can be eliminated, and reliability of relay protection of an electric power system can be improved.
Description
technical field [0001] The invention belongs to the technical field of electric power system relay protection, and in particular relates to a protection starting method and device based on transient quantities. Background technique [0002] With the increasing scale of the power system, the voltage level of the transmission line is getting higher and higher, and my country's power grid has undergone tremendous changes. my country has built the largest AC-DC hybrid power grid architecture. Line transmission capacity requires shorter and shorter fault removal time. [0003] Traditional relay protection devices rely solely on power frequency to start protection, and their sampling frequency is generally not higher than 10kHz. The noise interference introduced into the device by the hardware circuit can basically be ignored, but it cannot meet the requirements of rapid fault removal under some working conditions. [0004] Transient protection is a relay protection device based o...
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IPC IPC(8): H02H7/26H02H1/00
CPCH02H1/0007H02H7/26
Inventor 李旭王莉李宝伟樊占峰方正倪传坤石欣张旭李文正邓茂军董新涛陈继瑞唐艳梅姜自强
Owner 河南许继继保电气自动化有限公司