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Power distribution network bidirectional allow type protection method based on FTU role identification

A permissive protection and distribution network technology, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve the problem of not being able to adapt to the exit circuit breaker not participating in signal transmission or reception, so as to avoid malfunction, reduce workload, The effect of accurate and fast 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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  • Power distribution network bidirectional allow type protection method based on FTU role identification
  • Power distribution network bidirectional allow type protection method based on FTU role identification
  • Power distribution network bidirectional allow type protection method based on FTU role identification

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 1. Line equipment configuration

[0038] 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 the circuit breakers for each segment protection on the line are installed corresponding to the FTU. , is the outgoing line circuit breaker in the substation, the outgoing line protection equipment does not participate in the receiving or sending of the permission signal, and the corresponding outgoing line protection is CB1, CB7; , is the section protection circuit breaker adjacent to the outgoing line circuit breaker, and defines the corresponding FTU2, FTU6 are outlet FTUs; , , are section protection circuit breakers, LB is a tie switch, and the corresponding FTU3, FTU4, FTU8, and FTU5 are defined as line FTUs; in normal operation, LB is in a disconnected state, and both sides supply power respectively , Areas 1, 2, ...

Embodiment 2

[0070] The difference from Example 1 is that, as attached Figure 4 As shown, after the line fault, part of the load is transferred to power supply, area 2 is fault isolated, areas 3 and 4 are transferred from B power supply, and area 1 is still powered by A power supply.

[0071] At this time, the contact switch LB is closed, and QF2 and QF3 are disconnected. The following only takes the B power supply area as an example for analysis.

[0072] 1) If a short circuit fault occurs at k4,

[0073] Only CB7 feels the overcurrent. Other FTUs do not feel the overcurrent, and the corresponding section protection circuit breakers do not operate. After the delay time, CB7 can still feel the overcurrent, control the tripping of the outgoing circuit breaker in substation B, and successfully remove the fault at line k4.

[0074] 2) If a short circuit fault occurs at k2,

[0075] CB7, outlet FTU6, line FTU5, line FTU8, and line FTU4 all feel overcurrent.

[0076] ① The outlet FTU6 sen...

Embodiment 3

[0087] The difference from Example 1 is that, as attached Figure 5 As shown, if bus A fails or is overhauled, all the loads it carries will be transferred, and areas 1, 2, 3, and 4 will be transferred from B power supply.

[0088] At this time, the outlet circuit breaker QF1 is disconnected and the contact switch LB is closed.

[0089] 1) If a short-circuit fault occurs at k2, k4, etc., the fault handling process is similar to that described in (2), and will not be repeated here.

[0090] 2) If a short circuit fault occurs at k1,

[0091] ①FTU2, FTU3, FTU4, FTU8, FTU5, and FTU6 all feel overcurrent, and send trip request inquiry signals to adjacent FTUs;

[0092] The outlet FTU2 identifies the power direction, and the short-circuit current power direction is opposite to the positive direction defined by the outlet FTU2.

[0093] ② FTU2 directly sends a trip command to the corresponding section circuit breaker to remove the fault. The overcurrent disappears, and other prot...

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Abstract

The invention discloses a novel power system power distribution network segmented relay protection method. An FTU sends trip request signals to adjacent FTUs after experiencing the short circuit current, and after the trip allowance signal is obtained, the bidirectional allow type protection of corresponding segmented relay tripping is realized, and the method is suitable for the condition that a main station doesn't participate in the control, a transformer station outlet breaker doesn't participate in the allowance signal transmission and reception, and is particularly suitable for the line segmented protection of a power distribution network designed in a closed loop manner and running in an open loop manner (namely, a hand-in-hand structure with power transfer). The method completes the fault information exchange between adjacent two-stage segment protection by means of optical fiber communication technology, accurately positions the fault section by means of the fault information, realizes the accurate segment protection, effectively shortens the motion delay cooperated with multi-stage segment protection, rapidly isolates the faults, and reduces the power shutdown section influenced by the faults.

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 networks based on FTU role identification. Background technique [0002] In recent years, the distribution network has become increasingly urgent to reduce the number of short-term power outages and narrow the fault-affected power outage interval. The distribution network load is large and unevenly distributed along the line. In order to reduce the fault outage area and outage time, it is necessary to divide the line into multiple sections through multi-level protection devices. Different from the transmission line, the distribution line is generally short, and the current protection is mainly coordinated through the time difference. The general protection level difference is 0.3s. When there are too many protection levels (such as four or more levels), this will cause the outlet circ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26
CPCH02H7/262
Inventor 贾廷波王晓梅李兵尹德强申磊郑楠王邦惠孙晓斌
Owner STATE GRID SHANDONG ELECTRIC POWER COMPANY RIZHAOPOWER SUPPLY
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