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Fault diagnosis and degree evaluation method of frame circuit breaker based on operating accessory current

A fault diagnosis and circuit breaker technology, which is applied in circuit breaker testing, instrumentation, and electrical measurement, can solve problems such as economic losses caused by power outages, misjudgment of fault levels, and affecting the working status of circuit breakers.

Active Publication Date: 2019-05-31
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the research on the degree of failure is limited to the orderly classification of the degree of failure, that is, the use of intelligent identification algorithms to identify faults with a fixed degree. The degree of misjudgment will affect the grasp of the working state of the circuit breaker in the slightest, and cause power outages and major economic losses in severe cases.

Method used

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  • Fault diagnosis and degree evaluation method of frame circuit breaker based on operating accessory current
  • Fault diagnosis and degree evaluation method of frame circuit breaker based on operating accessory current
  • Fault diagnosis and degree evaluation method of frame circuit breaker based on operating accessory current

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0212] In this example, a frame-type circuit breaker of model DW15-1600 is used as the test object. The mechanical structure of this circuit breaker is highly visible, and it is suitable for distribution networks with a rated operating voltage of 380V and 50Hz. The rated current is 1600A, and the switch mechanism is a spring. operating mechanism. The energy storage motor is a reluctance synchronous motor with a rated voltage of AC380V, a starting torque of not less than 8N·m, and a speed of 750r / min. The fault simulation method in the energy storage stage is: use a hard iron wire to fix a certain length of energy storage spring to simulate the spring jamming caused by the corrosion of the energy storage spring of the circuit breaker, and place a wooden wedge between the transmission gears to simulate the transmission gear jam of the circuit breaker. For astringent faults, since the probability of spring falling off is relatively small and extreme, only one spring falling off i...

Embodiment 2

[0238] In this example, a frame-type circuit breaker of model DW15-1600 is used as the test object. The mechanical structure of this circuit breaker is highly visible, and it is suitable for distribution networks with a rated operating voltage of 380V and 50Hz. The rated current is 1600A, and the switch mechanism is a spring. operating mechanism. The closing electromagnet in the closing coil circuit is an armored solenoid electromagnet, the voltage is 380V, 50Hz, the number of turns is 2130 turns, and the enamelled copper wire has a diameter of 0.25mm. The fault simulation method in the closing coil circuit is as follows: a thin iron wire is inserted between the moving iron core shaft of the solenoid electromagnet and the coil to simulate the jamming fault of the iron core; Insert a small wooden rod to simulate the jamming fault of the mechanical structure; the simulation of the fault degree of insufficient iron core stroke is realized by adding different numbers of rubber pad...

Embodiment 3

[0266] In this example, a frame-type circuit breaker of model DW15-1600 is used as the test object. The mechanical structure of this circuit breaker is highly visible, and it is suitable for distribution networks with a rated operating voltage of 380V and 50Hz. The rated current is 1600A, and the switch mechanism is a spring. operating mechanism. The opening electromagnet in the opening coil circuit is a snap-on electromagnet, the voltage is 380V, 50Hz, the number of turns is 4650 turns, and the enamelled copper wire has a diameter of 0.21mm. The fault simulation method of the opening coil circuit is: use an elastic rope to tie the push rod push piece, and simulate the abnormal resistance of the push rod during the stroke; since the opening electromagnet is a snap-on electromagnet, its armature stroke is smaller than that of the closing electromagnet , in order to construct a sufficient number of faults of different degrees, so by pasting different numbers of hard paper (0.1mm...

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Abstract

The invention relates to a frame-type circuit breaker fault diagnosis and degree evaluation method based on operating accessory current. The method includes the steps of firstly determining the working stages, including an energy storage stage, a closing stage and an opening stage, of the circuit breaker to be diagnosed and evaluated, then using the current of an energy storage motor to diagnose fault during the energy storage stage, and using the current of a closing coil to diagnose fault during the closing stage, using the current of the opening coil to diagnose fault and assess degree during the opening stage, respectively detecting the current signals of the energy storage motor during the energy storage stage, the current signals of the closing coil to diagnose fault during the closing stage and the current signals of the opening coil during the opening stage, conducting fault diagnosis with a multi-core support vector machine, and accurately determining the fault degree through a fault degree characteristic curve when the degree of the fault diagnosed has to evaluated.

Description

technical field [0001] The technical solution of the present invention relates to the fault diagnosis and degree evaluation of a circuit breaker, in particular to a method for fault diagnosis and degree evaluation of a frame type circuit breaker based on the operating accessory current. Background technique [0002] With the rapid development of the national economy, ordinary users have also begun to put forward higher requirements for power quality. The low-voltage distribution network is the terminal power grid of the transmission network, which is directly connected to the majority of users. It is very important to connect the transmission network and users. It is the key to distribute and regulate electric energy to the majority of power users in the power system. The operation and maintenance level and health of the low-voltage distribution network often directly determine the quality of power consumption of power users. The key equipment frame circuit breaker in the lo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/327
CPCG01R31/3277
Inventor 孙曙光张强杜太行王佳兴齐玲王岩
Owner HEBEI UNIV OF TECH
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