Networking intelligent switch protection system for feeders of power distribution networks

An intelligent switch and protection system technology, applied in emergency protection circuit devices, electrical components, etc., can solve problems such as power supply and production impact, and achieve the effects of reducing power outages, high reliability, and simple structure

Inactive Publication Date: 2015-06-10
KAILI POWER SUPPLY BUREAU +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this mode, the circuit breaker at the outlet of the substation will operate, causing some non-faulty areas to also have a power outage. Although the time is relatively short, it will also affect normal power supply and production.

Method used

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  • Networking intelligent switch protection system for feeders of power distribution networks
  • Networking intelligent switch protection system for feeders of power distribution networks
  • Networking intelligent switch protection system for feeders of power distribution networks

Examples

Experimental program
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specific Embodiment 1

[0028] see figure 2 as shown, figure 1 It is a structural schematic diagram of the intelligent switch protection system of distribution network feeder network in the present invention.

[0029] In one embodiment, several switches, intelligent protection switches, gateways, sensors, actuators and processors are included.

[0030] The above sensor can detect the power flow direction when a large number of induction motors are faulty in some industrial loads in the distribution network. There is overcurrent on this side and the load side has "no current" or "current", but the power direction is opposite to this side. , turn off the switch on this side. In the case of installing a voltage transformer, the fault point can be accurately detected. If no voltage transformer is installed on site, the system can calculate the fault current phase in real time based on the fault occurrence time as the starting point, and send it to the neighborhood switch (the switch is divided, or th...

specific Embodiment 2

[0040] In one embodiment, in the networked mode, when a short-circuit fault occurs somewhere in the distribution network line, CB1, S1, and S2 pass the short-circuit current, and S3 does not pass the short-circuit current. In order to quickly identify faults, a protection switch is installed on the switch, and the short-circuit large current is monitored through the short-circuit current acquisition module of the protection switch, and at the same time, a short-circuit blocking signal is sent to the upper-level protection switch, as follows image 3 Shown:

[0041] The protection 3 detects the short-circuit current and generates a short-circuit blocking signal, and the protection 1, protection 2 and protection 3 detect the short-circuit current at the same time and generate a short-circuit blocking signal at the same time. Protection 4 cannot detect short-circuit current. The short-circuit locking signal of each switch protection is connected to the input terminal of the uppe...

specific Embodiment 3

[0042] In one embodiment, the fault isolation of the power supply terminal is shown as follows Figure 4 shown.

[0043] The above-mentioned protection 3 detects a fault, but fails to receive the fault blocking information sent by the next-level protection, so the fault is in this area, and the protection 3 outputs a control command to control the opening of the S2 switch to isolate the fault. If the protection 3 refuses to operate, the definite time protection of the protection 2 starts, and the S1 switch is controlled to open to isolate the fault.

[0044] In one embodiment, in order to complete fault isolation, the closing switch at the downstream end of the fault must also be disconnected to achieve complete fault isolation. Therefore, protection 3 sends isolation information to its next-level protection 4, After the lower-level protection 4 receives the isolation information sent by the upper level, it outputs a control command to control the opening of the S3 switch to co...

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Abstract

The invention provides a networking intelligent switch protection system for feeders of power distribution networks. The networking intelligent switch protection system has the advantages that the networking intelligent switch protection system is applied to the feeders of the power distribution networks and has nearby protection and on-site isolation functions by the aid of powerful network data exchange, quick fault detection technologies, adaptive power supply direction technologies, synchronous locking technologies, quick region isolation technologies and quick communication technologies are implemented, accordingly, faults only affect circuits in zones with the faults without being spread to circuits of other normal zones after the faults occur, the power failure range can be diminished, the power failure time can be shortened, the faults can be quickly positioned, and the quick first-aid repair purpose can be achieved; the networking intelligent switch protection system is simple in structure, low in correlation and high in reliability, the faults can be diagnosed and isolated in non-disconnection states of circuit breakers at exits of transformer substations, and accordingly power failure of the zones with the non-fault circuits can be reduced to the greatest extent.

Description

[0001] technical field [0002] The invention relates to a networked intelligent switch protection system for distribution network feeders, which belongs to the field of urban distribution network feeder automation. [0003] Background technique [0004] With the development of the economy, urban users' requirements for power supply reliability and power quality continue to increase, and the power supply department pays more and more attention to the distribution network feeder automation, and the reliability of the urban distribution network power supply is mainly reflected in the feeder failure. on the processing. [0005] At present, the feeder automation of the urban distribution network mainly adopts centralized fault diagnosis and processing, that is, the distribution network master station system conducts comprehensive diagnosis based on the protection action information of the circuit breaker, the overcurrent information of the FTU on the line, and the topology info...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26
Inventor 龙家焕王荣文石祖昌杨海勇龙兴富施辉详蒋友权李正佳
Owner KAILI POWER SUPPLY BUREAU
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