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Bidirectional allowable protection method employing master station to identify dynamic topology for power distribution circuit

A permissive protection and dynamic topology technology, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve the problem that the outlet circuit breaker does not participate in signal transmission or reception, etc., to achieve accurate positioning, reduce fault hazards, and accurately The effect of quick positioning

Inactive Publication Date: 2017-02-22
STATE GRID SHANDONG ELECTRIC POWER COMPANY RIZHAOPOWER SUPPLY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The two-way permissive overcurrent protection method that does not discriminate the direction of the fault current does not discriminate the current direction. After the FTU senses the overcurrent, it sends a permit signal to its adjacent sides, requiring the exit circuit breaker to participate in the transmission of the permit signal, which cannot be adapted to the on-site exit circuit breaker. Not participating in signal transmission or reception

Method used

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  • Bidirectional allowable protection method employing master station to identify dynamic topology for power distribution circuit
  • Bidirectional allowable protection method employing master station to identify dynamic topology for power distribution circuit
  • Bidirectional allowable protection method employing master station to identify dynamic topology for power distribution circuit

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 1. Line equipment configuration

[0040] Generally, the distribution network in the hand-in-hand link is a closed-loop design and an open-loop operation. The system structure is as follows figure 1 shown. It is powered by two power sources A and B, and each circuit breaker is installed with a corresponding FTU. Among them, , is the outlet circuit breaker, and the outlet protection equipment does not participate in the receiving or sending of the permission signal, and the corresponding outlet protection is CB1, CB7; , is the outlet For the next circuit breaker of the circuit breaker, the corresponding FTU2 and FTU6 are defined as boundary FTUs. According to the operating conditions, the master station recognizes them as the beginning or end FTUs; The FTU3, FTU4, FTU5, and FTU8 are middle FTUs, and FTU8 only participates in the reception or transmission of the permission signal when the LB is closed; in normal operation, the LB is in the open state, and the two sides ar...

Embodiment 2

[0068] The difference from the embodiment is that the load is transferred, and the areas 1, 2, 3, and 4 are transferred by the B power supply.

[0069] At this time the contact switch LB is closed, as attached Figure 4 As shown, the border FTU2 is recognized by the master station as the tail end FTU, and the border FTU6 is recognized by the master station as the head end FTU.

[0070] 1) If a short circuit fault occurs at k3,

[0071] Only CB7 feels the overcurrent. Other FTUs cannot feel the overcurrent, and the corresponding circuit breaker cannot operate. After the delay time, CB7 can still feel the overcurrent, control the exit circuit breaker to trip, and successfully remove the fault at line k4.

[0072] 2) If a short circuit fault occurs at k2,

[0073] CB7, head-end FTU6, intermediate FTU5, intermediate FTU8, and intermediate FTU4 sense overcurrent and send inquiry signals to adjacent FTUs.

[0074] At this moment, FTU3 does not feel the overcurrent, and sends a ...

Embodiment 3

[0080] The difference from Example 1 is that the load is transferred, areas 3 and 4 are transferred by B power supply, and areas 1 and 2 are still powered by A power supply

[0081] At this time, the contact switch LB is closed, and QF3 is normally open. Figure 5 As shown, the border FTU2 is recognized by the master station as the originating FTU, and the border FTU6 is also recognized as the originating FTU by the master station. The following analysis only takes the B power supply area as an example.

[0082] 1) If a short circuit fault occurs at k3,

[0083] Only CB7 feels the overcurrent. After the delay time, CB7 can still feel the overcurrent, control the exit circuit breaker to trip, and successfully remove the fault at line k4.

[0084] 2) If a short circuit fault occurs at k2,

[0085] CB7, head-end FTU6, intermediate FTU5, intermediate FTU8, and intermediate FTU4 sense overcurrent and send inquiry signals to adjacent FTUs.

[0086] At the moment, FTU3 does not ...

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Abstract

The invention discloses a bidirectional allowable protection method employing a master station to identify a dynamic topology for a power distribution circuit. The method comprises the steps of firstly, dividing an FTU (Feeder Terminal Unit) into a boundary FTU and an intermediate FTU, and determining whether the boundary FTU is an initial-end FTU or a tail-end FTU or not by the master station through dynamic topology identification; judging whether an allowable signal is sent to an upper-level FTU and a lower-level FTU according to an overcurrent whether can be sensed by the FTU or not; controlling corresponding circuit breakers to do action according to the overcurrent whether can be sensed by the initial-end FTU, the tail-end FTU and the intermediate FTU and the allowable signal whether is received or not within a stipulated time; and outputting the actions of the circuit breakers if the overcurrent exists within time () after a fault to achieve fault protection between the initial-end FTU and an outgoing line circuit breaker. The method utilizes a network communication technology to complete action information exchange among adjacent levels of protection, the action delay brought by multi-level matching is effectively shortened, the fault is rapidly isolated, and the fault danger is reduced.

Description

technical field [0001] The invention relates to the field of relay protection for power system distribution lines, in particular to a bidirectional allowable protection method for distribution lines using a master station to identify dynamic topology. Background technique [0002] Traditional relay protection mostly utilizes the size of the setting value and the coordination of time to realize the detection and isolation of line faults. It is difficult to cooperate with the setting value and it is easy to overstep the action. Using time coordination, the fault removal time is long, which may damage the main transformer and other equipment. Moreover, the relay protection and the safety automatic device lack cooperation and are independent of each other, so data cannot be shared. In short, the existing protection and safety automatic devices can no longer meet the requirements of power system development. [0003] In recent years, the rapid development of distribution networ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26
CPCH02H7/262
Inventor 任力贾廷波李兵尹德强王晓梅申磊王毅刘永朱晓东王邦惠孙晓斌
Owner STATE GRID SHANDONG ELECTRIC POWER COMPANY RIZHAOPOWER SUPPLY
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