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Relay protection method of the line single phase grounding failure affected by the distribution-resisting capacitance and current

A single-phase ground fault and relay protection technology, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve the problems of low voltage level of transmission lines, inability to correctly judge the fault location, short (not exceeding 500km) and other problems

Active Publication Date: 2007-07-11
TSINGHUA UNIV +1
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  • Application Information

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Problems solved by technology

For distributed capacitance, the voltage level of high-voltage (110kV, 220kV), ultra-high-voltage (330kV, 500kV) transmission lines is not high, especially the transmission line length is short (not exceeding 500km), and the distributed capacitance has little influence on the impedance relay. It is lower than 4% of the protection range, basically can be ignored or can be compensated by protection setting, so the current grounding impedance relay can basically meet the actual needs
However, for UHV transmission lines above 750kV (1000kV, 1150kV), the typical transmission radius is 800km to 1000km, and the influence of distributed capacitance can no longer be ignored; at this time, the premise of the traditional grounding impedance relay is no longer valid, and the fault location cannot be correctly judged. New conservation methods must be developed

Method used

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  • Relay protection method of the line single phase grounding failure affected by the distribution-resisting capacitance and current
  • Relay protection method of the line single phase grounding failure affected by the distribution-resisting capacitance and current
  • Relay protection method of the line single phase grounding failure affected by the distribution-resisting capacitance and current

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Embodiment Construction

[0064] The embodiment of the relay protection method for the line single-phase ground fault that is resistant to the influence of the distributed capacitance current proposed by the present invention is described in detail as follows:

[0065] A type of 1000kV UHV power transmission system applying the present invention is shown in Figure 1, and the line parameter values ​​are shown in Table 1. The line length is 800km. The system impedance on both sides is as follows, the power supply angle of the N side is 44 degrees behind the M side, and the potentials of the M side and N side are 1.1062 and 1.1069 times the rated voltage respectively. Taking the M side protection as an example, the voltage and current come from the line side voltage transformer (PT) and current transformer (CT) respectively.

[0066] Table 1 Main parameters of 1000kV UHV transmission line

[0067] Line parameters

Resistance (Ω / km)

Reactance (Ω / km)

Capacitive reactance (MΩ / km)

...

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Abstract

This invention belongs to power system relay protection field and relates to anti-distribution capacitor current single phase earth fault relay protection method, which comprises each phase voltage, current, zero order voltage and current in the transducer station as input voltage, wherein, it uses measurement voltage and current to compute reactor Relay measurement voltage and current proportion; according to circuit distribution parameter to compute resistance integral value; using measurement resistance and integral vale to get relative operation base.

Description

technical field [0001] The invention belongs to the field of relay protection of power systems, in particular to a relay protection method for single-phase ground faults of high-voltage transmission lines based on accurate measurement of short-circuit impedance. Background technique [0002] Distance protection is widely used in power system line protection, and impedance relay is the measuring element in distance protection. Since there are many types of short circuits in the power system, different impedance relays are required to respond to different types of faults. Examples: Ground impedance relays that respond to short circuits to ground and phase-to-phase impedance relays that respond to phase-to-phase short circuits. At present, the commonly used grounding impedance relays mainly include the following types: ① round characteristic impedance relay; ② quadrilateral characteristic impedance relay; ③ linear characteristic impedance relay. [0003] Regardless of the ope...

Claims

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Application Information

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IPC IPC(8): H02H7/26
Inventor 董新洲王宾薄志谦
Owner TSINGHUA UNIV
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