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Bus protection method based on line mode current S transformation argument detection

A line-mode current and busbar protection technology, applied in the direction of the fault location, can solve the problems of current transformer saturation and transition resistance, and achieve the effect of low sampling rate and simple principle

Inactive Publication Date: 2016-01-27
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the problem that the existing busbar protection method is affected by load current, current transformer saturation and transition resistance, etc., and propose a busbar protection method based on line-mode current S transformation argument angle detection

Method used

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  • Bus protection method based on line mode current S transformation argument detection
  • Bus protection method based on line mode current S transformation argument detection
  • Bus protection method based on line mode current S transformation argument detection

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Example 1: Bus fault

[0037] by figure 1 The power transmission system shown is taken as an example, and its line parameters are set as follows: the system bus adopts 3 / 2 connection, and the length of each outgoing line connected to the bus is L 1 =L 2 =L 3 =L 4 = 400km. Fault setting: set the phase A ground fault on the busbar, the initial phase angle of the fault is 90°, the transition resistance is 10Ω, the sampling rate is 10kHz, the fault time is set to 0.4463s, and the time range is 0.4453s to 0.4473s for fault three phase current.

[0038] (1) According to the set fault, get the three-phase current data through the measuring terminal according to step 1 in the manual, and calculate the line-mode current data including the fault phase;

[0039] (2) Carry out S-transformation to the line-mode current containing the fault phase according to step 2 to obtain an amplitude matrix, and determine the arrival time of the traveling wave by the abrupt point of the hi...

Embodiment 2

[0042] Example 2: Line L 1 Fault

[0043] by figure 1 The power transmission system shown is taken as an example, and its line parameters are set as follows: the system bus adopts 3 / 2 connection, and the length of each outgoing line connected to the bus is L 1 =L 2 =L 3 =L 4 = 400km. Fault setting: set line L 1 When a phase A ground fault occurs, the initial phase angle of the fault is 90°, the transition resistance is 10Ω, the sampling rate is 10kHz, the fault time is set to 0.4463s, and the fault three-phase current is taken within the time interval from 0.4453s to 0.4473s.

[0044](1) According to the set fault, get the three-phase current data through the measuring terminal according to step 1 in the manual, and calculate the line-mode current data including the fault phase;

[0045] (2) Carry out S-transformation to the line-mode current containing the fault phase according to step 2 to obtain an amplitude matrix, and determine the arrival time of the traveling wav...

Embodiment 3

[0048] Example 3: Line L 2 Fault

[0049] by figure 1 The power transmission system shown is taken as an example, and its line parameters are set as follows: the system bus adopts 3 / 2 connection, and the length of each outgoing line connected to the bus is L 1 =L 2 =L 3 =L 4 = 400km. Fault setting: set line L 2 When a phase A ground fault occurs, the initial phase angle of the fault is 90°, the transition resistance is 10Ω, the sampling rate is 10kHz, the fault time is set to 0.4463s, and the fault three-phase current is taken within the time interval from 0.4453s to 0.4473s.

[0050] (1) According to the set fault, get the three-phase current data through the measuring terminal according to step 1 in the manual, and calculate the line-mode current data including the fault phase;

[0051] (2) Carry out S-transformation to the line-mode current containing the fault phase according to step 2 to obtain an amplitude matrix, and determine the arrival time of the traveling wa...

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Abstract

The invention relates to a bus protection method based on line mode current S transformation argument detection, and belongs to the technical field of power system relay protection. When a fault happens to a line or a bus, three-phase current data of each line of the bus in a short-time window is extracted after the fault, and a line mode current containing a fault phase is calculated through the three-phase current data. The method carries out the S transformation of the line mode current, and obtains an amplitude matrix of the line mode current. The method determines the arrival moment of a traveling wave through an abrupt change point of the highest-frequency component in the S transformation amplitude matrix, and solves an argument difference between the line mode current and the remaining line mode currents. The phase relation of high-frequency components of all line mode currents at the starting moment of the fault forms the criterion. The method achieves the discrimination of a line fault and a bus fault according to the criterion. Large amount of simulation analysis indicates that the method can reliably discriminate an outgoing line fault and the bus fault, is simple in theory, is reliable and effective.

Description

technical field [0001] The invention relates to a busbar protection method based on line-mode current S transformation argument detection, and belongs to the technical field of electric power system relay protection. Background technique [0002] The busbar connects multiple incoming and outgoing lines, is the hub of power transmission and distribution, and occupies an extremely important position in the power system. When the busbar fails, if the faulty busbar cannot be detected and removed in time, the scope of the accident will be expanded, more equipment will be destroyed, the safe and stable operation of the power system will be damaged, and the entire power system will even be disintegrated. Therefore, the research has high reliability, good selectivity and high sensitivity. The principle of busbar protection is necessary. [0003] Busbar protection mainly uses Kirchhoff's current law to identify busbar faults. When the sum of the currents on the lines connected to th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
Inventor 束洪春白冰
Owner KUNMING UNIV OF SCI & TECH
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