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Redundant sampling optimization method for relay protection
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A relay protection and sampling optimization technology, applied in emergency protection circuit devices, electrical components, etc., can solve problems such as abnormal sampling, affecting the reliability of relay protection, etc., to prevent incorrect actions, reduce the probability of blocking protection functions, The effect of improving reliability
Inactive Publication Date: 2019-11-01
NR ENG CO LTD +1
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Abstract
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Problems solved by technology
Due to the damage of the sampling circuit components and other reasons, the sampling is abnormal, which seriously affects the reliability of the relay protection.
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Embodiment 1
[0040] figure 1 Shown is a flowchart of a redundant sampling optimization method for relay protection. Embodiment 1 of the present invention provides a redundant sampling optimization method for relay protection, including the following steps:
[0041] Step 1: The relay protection device is provided with 3 sets of sampling circuits.
[0042] Step 2: Obtain sampled value 1, sampled value 2, and sampled value 3 of the measured electrical quantity after being sampled by three sets of sampling loops respectively.
[0043] Step 3: Consistency judgment is performed on each two groups of sampled values in sampled value 1, sampled value 2 and sampled value 3 respectively.
[0044] Among them, the method for the consistency judgment of each two groups of sampling values is as follows:
[0045] Step 31, calculating the instantaneous value difference and the instantaneous value sum of two groups of sampling values;
[0046] Step 32, judge the judgment condition 1 and the judgment ...
Embodiment 2
[0056] Embodiment 2 of the present invention provides a redundant sampling optimization method for relay protection, comprising the following steps:
[0057] S1, the relay protection device is equipped with 3 sets of sampling circuits;
[0058] S2, obtain the sampled value 1, sampled value 2 and sampled value 3 of the measured electrical quantity after being sampled by 3 sets of sampling loops respectively;
[0059] S3, performing consistency judgment on each two groups of sampled values in sampled value 1, sampled value 2, and sampled value 3, respectively.
[0060] Discrimination condition 1, whether the absolute value of the instantaneous value difference between sampled value i and sampled value j is greater than the absolute value of the instantaneous value sum of sampled value i and sampled value j that is a multiple of the first preset value;
[0061] |A i (n)-A j (n)|>α|A i (n)+A j (n)|
[0062] Among them: A i (n) is the nth instantaneous value of sampling valu...
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Abstract
The invention discloses a redundant sampling optimization method for relay protection. The method comprises steps that step one, a relay protection device is provided with three sets of sampling loops; step two, sampling values 1, sampling values 2 and sampling values 3 after redundantly sampling of detected electrical quantities are respectively obtained; step three, every two sets of sampling values in the sampling values 1, the sampling values 2 and the sampling values 3 are subjected to consistency discrimination; and step four, final sampling values of the measured electrical quantity arecalculated according to the discrimination result of the step three. When a set of sampling loops is abnormal, the sampling value data of the other two sets of sampling loops are utilized, the probability of a blocking protection function of the relay protection device is greatly reduced, and reliability of the relay protection device is improved, in addition, consistency of instantaneous valuesof the sampling values is determined, redundant sampling anomalies are quickly identified, and the relay protection device is prevented from operating incorrectly.
Description
technical field [0001] The invention belongs to the field of electric powersystem relay protection, and in particular relates to a redundant sampling optimization method for relay protection. Background technique [0002] The power system relay protection device is an automatic device that quickly and accurately trips the circuit breaker or sends a signal when the electrical components in the power system fail or operate abnormally. [0003] The relay protection device collects the AC analog voltage and current through the collection module. Each AC analog input is equipped with a sampling loop, including amplifiers, anti-aliasing filters and an A / D converter, which converts the analog to digital and then to the processor. Due to the damage of the sampling circuit components and other reasons, the sampling is abnormal, which seriously affects the reliability of the relay protection. [0004] In order to improve the reliability of the relay protection system, the sampling ...
Claims
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