High-voltage hybrid line fault section discrimination method using ratio braking differential principle
A technology of ratio braking and high-voltage mixing, applied in the direction of fault location, fault detection according to conductor type, emergency protection device for automatic disconnection, etc., can solve problems such as system and electrical equipment impact, endangering system stability and safe operation, explosion, etc. , to improve performance
Inactive Publication Date: 2020-01-31
EXAMING & EXPERIMENTAL CENT OF ULTRAHIGH VOLTAGE POWER TRANSMISSION COMPANY CHINA SOUTHEN POWER GRID
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Problems solved by technology
Most of the short-circuit faults of cables (including submarine cables) are permanent faults. If the circuit breaker is reclosed, an arc will be generated again at the fault point, which will not only cause another impact on the system and electrical equipment, but also expand the cable fault and even cause caused an explosion
For overhead-cable mixed lines, if the fault location is in the cable part, opening the reclosing switch will cause more serious accidents; if the reclosing switch is blocked, the chance of reclosing will be lost for overhead line faults, which may endanger the stability and safe operation of the system
Method used
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[0041] refer to figure 1 , figure 2 As shown, it is a schematic diagram of an overhead-cable hybrid line applicable to this method. The overhead-cable hybrid line includes two types: Type A and Type B. Type A includes two sections of overhead line and a section of cable, and the cable section is connected to two overhead Between the line segments, the two overhead line segments are the overhead line segment I and the overhead line segment II respectively, and the type B includes an overhead line segment and a cable segment, and the faulty section is identified by using the current sampling values at both ends of the overhead line segment. Specifically, the process as image 3 , Figure 4 As shown, the method includes the following steps:
[0042] When the hybrid line fails, the protection action trips the circuit breakers on both sides of the hybrid line;
[0043] Obtain the current sampling value at both ends of the overhead line segment, perform capacitive current com...
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The invention discloses a high-voltage hybrid line fault section discrimination method using a ratio braking differential principle. When a hybrid line fails, circuit breakers on both sides of the line are tripped off by a protection action, capacitance current compensation is carried out on current sampling values at both ends of an overhead line segment, a current phasor value is calculated by using the compensated current sampling values, and fault section discrimination is carried out by using the ratio braking differential principle. If the fault occurs in an overhead line I section or anoverhead line II section or the overhead line segment, a reclosing circuit breaker is opened, otherwise, the reclosing circuit breaker is closed. According to the invention, whether the reclosing circuit breaker is opened is determined through fault section discrimination, the reclosing circuit breaker is prevented from being reclosed when the fault is in a cable section, the reclosing opportunity is not lost when the fault is in the overhead line, and the performance of automatic reclosing can be improved.
Description
technical field [0001] The invention relates to the technical field of electric power detection, in particular to a method for discriminating a fault section of a high-voltage hybrid line using the principle of ratio brake differential. Background technique [0002] High-voltage cables are mainly used for cross-strait networking of regional power grids, power supply to offshore islands and offshore oil drilling platforms, grid-connection of offshore renewable energy power sources, and power supply to urban distribution networks. For example: Guangdong-Hainan 500kV interconnection line adopts overhead line-submarine cable hybrid line, overhead line is used for the land part, and submarine cable line is used for the part crossing the Qiongzhou Strait. [0003] The faults of overhead lines are mostly transient faults, and the lines can resume normal operation after reclosing. Most of the short-circuit faults of cables (including submarine cables) are permanent faults. If the c...
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IPC IPC(8): G01R31/08H02H3/06H02H7/26
CPCG01R31/086H02H3/06H02H7/26
Inventor 张怿宁王越杨国建宝杨光源
Owner EXAMING & EXPERIMENTAL CENT OF ULTRAHIGH VOLTAGE POWER TRANSMISSION COMPANY CHINA SOUTHEN POWER GRID