Ring network power supply system fault positioning system and method based on communication injection waveform

A fault location and power supply system technology, applied to electrical components, circuit devices, emergency protection circuit devices, etc., can solve feeder misoperation or refusal to operate, fault location algorithm failure, protection device current amplitude, angle uncertainty, etc. problems, to achieve stable and reliable data, reduce the scope of power outages, and avoid the effects of collection costs

Active Publication Date: 2021-09-28
南京弘毅电气自动化有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention is aimed at the problems existing in the prior art, and only uses the fault location method of each node fault current in the ring network power supply system to determine the fault location, so as to solve the uncertainty of the current amplitude and angle flowing through the protection device when the fault occurs , causing the original relay protection and feeder automation to malfunction or refuse to operate, the traditional fault location algorithm fails, and the problem of not meeting the reliability requirements of power supply

Method used

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  • Ring network power supply system fault positioning system and method based on communication injection waveform
  • Ring network power supply system fault positioning system and method based on communication injection waveform
  • Ring network power supply system fault positioning system and method based on communication injection waveform

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Embodiment 1

[0026] Embodiment 1: A ring network power supply system fault location system based on communication injection waveforms, the location system is composed of a relay protection device installed at each load / section switch and a protection server communicating with each protection device, The protection server and the relay protection device use optical fiber for full-duplex communication. Each switch is equipped with a relay protection device, and each bus section is equipped with a protection server. The relay protection device of each bus section communicates with the corresponding protection device through the communication interface. The server is connected, and the faults under each switch are removed by the relay protection device of the switch. The protection server realizes the data sharing of all relay protection devices, so that each protection device can use the relay protection data of the entire busbar when making logical judgments. Realize network fault discriminat...

Embodiment 2

[0027] Embodiment 2: A ring network power supply system fault location method based on communication injection waveforms, the method includes the following steps:

[0028] Definition: The current phase angle refers to the angle difference between the current flowing through the switch and the reference waveform. The sudden change of the phase angle means that the angle change of the current phase angle between this cycle and the previous cycle exceeds 90 degrees. The installation direction of the current transformer of the relay protection device is uniform. , define the load that flows from the power source to the bus in this section as the positive direction.

[0029] S1: The relay protection device has a unique ID address in the whole network, and collects the three-phase current at the load / section switch according to the inherent sampling frequency;

[0030] S2: The protection server sends the sampling data of the fixed power frequency waveform according to the sampling f...

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Abstract

The invention relates to a looped network power supply system fault positioning system based on communication injection waveforms. The positioning system is composed of relay protection devices installed at each load / section switch and a protection server communicating with each protection device, and the protection server and the relay protection devices perform full duplex communication through optical fibers; and one section of bus area is configured with one device. According to the scheme, the power failure range can be effectively reduced, and the fault is isolated by tripping of the switch closest to the fault point; the scheme is irrelevant to the number of power supplies, so a radiation single-power supply network can be realized, and fault positioning and isolation of a multi-power supply annular power supply network can also be realized.

Description

technical field [0001] The invention belongs to the field of fault location of intelligent power distribution technology, and in particular relates to a method for fault location and isolation of a ring network power supply system based on communication injection waveforms. Background technique [0002] With the development of society, people have higher and higher requirements for power supply reliability, especially in important independent power supply areas such as hospitals and governments and ships and camps. For special loads with particularly high safety and reliability requirements, ring network power supply is generally adopted at present, and multiple power points supply power to the same load, which can be operated separately or in parallel. The power supply of the input device is not used, and the failure of one power supply does not affect the independent power supply of the intact power supply during parallel operation. However, no matter what kind of power s...

Claims

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Application Information

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IPC IPC(8): H02H1/00H02H7/26H02H7/28
CPCH02H1/0007H02H1/0061H02H1/0092H02H7/263H02H7/28
Inventor 李从飞田伟侯继海何龙陈凡
Owner 南京弘毅电气自动化有限公司
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