Relay protection method and device

A relay protection and power system technology, applied in the field of electronics, can solve problems such as excessive sampling interval, affecting AC sampling accuracy, and inability to accurately determine abnormal working conditions of power system faults, and achieve the effect of reliable relay protection

Inactive Publication Date: 2011-01-05
深圳市华力特电气有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the frequency of the actual power system will fluctuate within a certain range, especially for low-power power supply systems, such as diesel generator power supply systems, the signal frequency of the power supply grid will fluctuate in a large range with load fluctuations. If the signal cycle is calculated according to the rated frequency of the power system, the sampling interval will be too large or too small, causing the N-point sampling waveform to exceed or be less than one cycle, thus affecting the accuracy of AC sampling
However, when the real-time frequency of the power signal is actually fluctuating violently, for example, when a very serious fault occurs in the power system or the system cannot operate at all, the real-time frequency obtained by various methods in the prior art is inaccurate, so In this case, the relay protection device cannot accurately judge that the power system has failed or has abnormal conditions.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0020] Embodiment 1. The embodiment of the present invention provides an embodiment of a relay protection method, and the process is as follows figure 1 Shown, including:

[0021] 101. Obtain the real-time frequency of the AC signal;

[0022] During the actual operation of the power system, the real-time frequency of the AC signal in the system is constantly changing and cannot always be consistent with its rated frequency.

[0023] The method of obtaining the real-time frequency can be specifically as follows: In the process of relay protection, the relay protection device generally needs to measure many AC signals. One voltage or current loop can be selected as the frequency measurement loop, and the frequency measurement loop The AC signal is converted into a square wave signal, and then the square wave signal is counted by a second timer, and the real-time frequency of the AC signal can be obtained according to the count value.

[0024] 102. Determine whether the real-time frequen...

Embodiment 2

[0039] Embodiment 2. The embodiment of the present invention provides another embodiment of a relay protection method, and the process is as follows figure 2 Shown, including:

[0040] 201 and such figure 1 Step 101 in the first embodiment shown is the same, and will not be repeated here;

[0041] 202. Determine whether the real-time frequency is within the preset range, if not, perform step 203., if yes, perform step 204;

[0042] The process of the relay protection device judging whether the real-time frequency of the AC signal obtained in step 201 is within the preset range is the same as figure 1 The first embodiment shown is the same, but in this embodiment, the subsequent operation performed by the relay protection device according to the judgment result is the same as figure 1 The first embodiment shown is different, specifically:

[0043] When the real-time frequency acquired by the relay protection device is within the preset range, the relay protection device will also deter...

Embodiment 3

[0050] Embodiment 3. The embodiment of the present invention provides an embodiment of a relay protection device, the structure of which is as follows image 3 Shown, including:

[0051] The obtaining unit 301 is used to obtain the real-time frequency of the AC signal;

[0052] The AC sampling unit 302 is used to determine whether the real-time frequency is within the preset range, if not, adjust the first timer according to the rated frequency of the AC signal to perform AC sampling, and the first timer is used to generate samples during AC sampling Interrupt, if yes, adjust the first timer according to the real-time frequency to perform AC sampling;

[0053] The processing unit 303 is configured to perform analysis according to the AC sampling result, and the analysis result is used to determine whether a relay protection is required;

[0054] The relay protection unit 304 is used to protect the power system through a relay when relay protection is required.

[0055] Further, in thi...

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Abstract

The embodiment of the invention discloses relay protection method and device. After acquiring a real-time frequency of an AC signal, the relay protection device of the embodiment of the invention screens the real-time frequency in advance; if the real-time frequency is in a preset range, the relay protection device adjusts a first timer and controls an AC sampling frequency according the real-time frequency; and if the real-time frequency is not in the preset range, the relay protection device adjusts a first timer and controls the AC sampling frequency according to a rated frequency of the AC signal. Accordingly, the invention can reliably carry out relay protection to a power system.

Description

Technical field [0001] The invention relates to the field of electronic technology, in particular to a relay protection method and device. Background technique [0002] When the power system fails or other abnormal conditions that endanger safe operation occur, the relay protection device can automatically remove the faulty equipment from the system in the shortest time and smallest area possible, or send a signal to eliminate the abnormality by the staff on duty The root cause of the working condition to reduce or avoid the damage to other equipment and the influence on the power supply of adjacent areas. [0003] At present, the general process of the relay protection device to realize its function is as follows: [0004] 1. Real-time monitoring of the frequency change status of the power signal to obtain the real-time frequency of the power signal, where the power signal can be a current AC signal or a voltage AC signal; [0005] 2. Perform AC sampling on power signals; [0006] In...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26
Inventor 张宝贵郭彩霞董光府张进军
Owner 深圳市华力特电气有限公司
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