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Protection method and device for small resistance grounding system of distribution network

A small resistance grounding and distribution network technology, which is applied to emergency protection circuit devices, electrical components, etc., can solve problems such as unsafe distribution network systems

Active Publication Date: 2019-01-15
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Based on this, it is necessary to provide a protection method and device for the small resistance grounding system of the distribution network in view of the unsafe problem of the distribution network system

Method used

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  • Protection method and device for small resistance grounding system of distribution network
  • Protection method and device for small resistance grounding system of distribution network
  • Protection method and device for small resistance grounding system of distribution network

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Embodiment Construction

[0028] A protection method for a small resistance grounding system of a distribution network is provided in an embodiment, wherein, such as figure 1 As shown, the small resistance grounding system of distribution network includes main transformer, bus bar, grounding transformer and resistor. The main transformer is connected between the AC power supply and the bus bar. The bus bar is connected to one end of the resistor through the grounding transformer. The corresponding loads are respectively connected through each transmission line (which may be a feeder line). It can be understood that each power transmission line is connected to a corresponding load, for example, there are 4 power transmission lines and 4 loads, and each power transmission line is connected to a corresponding load.

[0029] like figure 2 As shown, the above-mentioned protection method for the small resistance grounding system of the distribution network includes the following steps:

[0030] S210: Obta...

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Abstract

The invention discloses a protection method and a protection device of a power distribution network small resistance grounding system. The faults of the system are detected, and when the high resistance grounding of the power distribution network small resistance grounding system is detected, a first protection motion signal is acquired, and when the multi-circuit fault of the power distribution network small resistance grounding system is detected, a second protection motion signal is acquired. According to zero sequence current, a third preset zero sequence current threshold value, and a third preset time threshold value, a third protection motion signal is acquired. When any of the first protection motion signal, the second protection motion signal, and the third protection motion signal satisfies a preset condition, a motion of a relay protection device is controlled, connection between a busbar and a load is broken, and when any of the above mentioned faults occurs, the motion of the relay protection device is controlled, the power provided by the busbar for the load is cut off, and then the safety of the system is guaranteed.

Description

technical field [0001] The invention relates to the field of power system control, in particular to a protection method and device for a small-resistance grounding system of a distribution network. Background technique [0002] Since the zero-sequence current protection has the advantages of simple principle and less components, for the feeder grounding fault of the small resistance grounding system of the distribution network, the zero-sequence current protection is currently used to isolate the fault. At present, the method of fault isolation through zero-sequence current protection only considers the occurrence of single-circuit ground faults and low transition resistance ground faults in the system. However, with the continuous development of the modern distribution network, the application of multi-circuit lines on the same pole is more extensive, which makes the types of ground faults on the feeders more and more complex, and at the same time, the distribution overhead...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26
CPCH02H7/26H02H7/267
Inventor 白浩郭晓斌雷金勇于力马溪原田兵
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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