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Anti-current mutual-inductor saturated suddenly-changed quantity difference current dynamic recollecting discrimination method

A technology of a current transformer and a discrimination method, which is applied in the protection, electrical components, circuit devices and other directions that react to overcurrent, can solve problems such as failure to equipment damage, protection rapidity limitation, and synchronous identification method sensitivity requirement limitation, etc. achieve high sensitivity

Inactive Publication Date: 2007-01-17
NANJING GUODIAN NANZI POWER GRID AUTOMATION CO LTD
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Problems solved by technology

Therefore, the synchronous identification method will be limited in sensitivity requirements
At the same time, due to the increase of the system capacity, the damage to the equipment caused by the fault is more serious. In order to protect the equipment, it is required to disconnect quickly when the fault occurs, and the saturation discrimination time of the synchronous identification method is generally 5ms, which also limits the rapidity of protection.

Method used

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  • Anti-current mutual-inductor saturated suddenly-changed quantity difference current dynamic recollecting discrimination method
  • Anti-current mutual-inductor saturated suddenly-changed quantity difference current dynamic recollecting discrimination method

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Embodiment Construction

[0039] The present invention will be further described below with reference to the accompanying drawings and examples.

[0040] The dynamic recall method of the busbar protection current transformer saturation mutation amount differential current of the present invention, its discrimination process is as follows:

[0041] ①According to the set time interval, collect the current transformer output terminal current of each branch of a certain busbar in the high-voltage and ultra-high-voltage equipment, and obtain the output terminal current I 1t , I 2t ... I nt , I 1(t+1) , I 2(t+1) ... I n(t+1) , I 1(t+2) , I 2(t+2) ... I n(t+2) ,..., I 1(t+m-1) , I 2(t+m-1) ... I n(t+m-1) . n is the serial number of the branch current transformer, m is the number of sampling points, the number of sampling points is the number of sampling points in one cycle, and the time interval is equal to the time of each cycle divided by the number of sampling points (T / m). t+1 represents the s...

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Abstract

The present invention discloses a method for distinguishing saturation of current transformer for buslar protection equipment in power system-busbar protection current trasformer saturation mutational load difference current dynamic recollecting method. The method uses mutational load difference current as main distinguishing basis and collects the output end current of every current transformer in high-voltage and ultrahigh-voltage equipment according to the interval of a certain time, and utilizes the A / D conversion mode to convert the output end current into digital quantity from analog quantity, then utilizes there digital quantities to make correspondent calculation and uses the distinguishing basis to correctly distinguish the fault source.

Description

technical field [0001] The invention belongs to the field of relay protection of power systems, and relates to a method for judging saturation of a current transformer (TA) in high-voltage and ultra-high-voltage power equipment (especially busbar protection equipment) in the power system. Background technique [0002] The function of power system relay protection is that when a certain part of the power system fails, it can quickly trip the adjacent circuit breaker at the fault point, reduce the scope of the accident, and ensure the safety of the power system. The relay protection judges whether the power system is normal or not is obtained by analyzing various currents and voltages after the current and voltage transformers are transformed. The current and voltage transformers are inductive components, and when the input volume contains a lot of DC or the harmonic volume is too large, it will be saturated and the transmission waveform will be distorted. At present, the met...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H3/08H02H3/26H02H7/26
Inventor 李天华夏俊陈亚强胡明辉毛乃虎汪思满王小春
Owner NANJING GUODIAN NANZI POWER GRID AUTOMATION CO LTD
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