Metal oxide varistor (MOV) based series compensation device
A series compensation and parallel connection technology, applied in reactive power compensation, circuit devices, reactive power adjustment/elimination/compensation and other directions, can solve problems such as potential safety hazards
Active Publication Date: 2016-08-17
STATE GRID CORP OF CHINA +1
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[0004] The invention provides an MOV-based series compensation device to solve the problem of potential safety hazards in the prior art
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[0026] In order to make the above objects, features and advantages of the present invention more comprehensible, specific implementations of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0027] The invention provides an MOV-based series compensation device to solve the problem of potential safety hazards in the prior art.
[0028] Specifically, the MOV-based series compensation device such as figure 1 As shown in the middle dotted line box, it is connected in parallel with the capacitor bank, and the MOV-based series compensation device includes: a first current transformer CT1, a second current transformer CT2, a first branch MOV1, a second branch MOV2 and a controller ;in:
[0029] Both the first branch MOV1 and the second branch MOV2 include a plurality of MOVs connected in series;
[0030] The first branch MOV1 is connected in parallel with the second branch MOV2;
[0031] The first current transformer CT1 is co...
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The invention provides a metal oxide varistor (MOV) based series compensation device. A metal zinc oxide lightning arrester is formed by connecting a first branch and a second branch in parallel, wherein the first branch circuit and the second branch circuit both comprise a plurality of MOVs, a first current transformer is used for detecting a branch current of the first branch circuit or the second branch circuit, and a second current transformer is used for detecting the total current of the MOV based series compensation device; a controller is used for performing calculation to obtain a logic calculation current of the first branch circuit and the second branch circuit according to the branch current and the total current; and when the change of the logic calculation current of the first branch circuit or the second branch circuit exceeds a preset value, it is indicated that the breakdown of at least one MOV or the damage to at least one MOV occurs in the corresponding branch circuit, at the moment, the controller judges that a fault occurs in the corresponding branch circuit, namely, fault monitoring of the MOV can be achieved, and a guarantee is provided for safe and reliable running of the MOV based series compensation device.
Description
technical field [0001] The invention relates to the technical field of high-voltage power supply, in particular to an MOV-based series compensation device. Background technique [0002] In the power system, series compensation devices play a vital role in compensating reactive power, extending the electrical distance of transmission lines and improving system stability. In the prior art, a plurality of MOVs (metal oxide varistors, metal oxide varistors, a semiconductor voltage-limiting anti-surge device sintered with zinc oxide) are commonly used in series to form a metal zinc oxide arrester, which is used to Or limit the overvoltage across the capacitor to a reasonable protection level in an abnormal state, thereby realizing the protection of the capacitor bank. [0003] However, in the prior art, during the normal operation of the MOV-based series compensation device, for the case of a single MOV breakdown or damage, since its protection effect on the capacitor bank is no...
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Login to View More IPC IPC(8): H02J3/18G01R31/08
CPCY02E40/30H02J3/1807G01R31/081
Inventor 李振动刁彦平宋巍顾颖王翀吴炜王龙宇李代君柏峰蔡勇赵伟刘启蒙郭飞王艳召王玉强于文博牛雪飞田霖金海望陈习文杨洁杨凡韩璐
Owner STATE GRID CORP OF CHINA