CN106885983B - On-line monitoring device for mechanical characteristics of circuit breaker - Google Patents

On-line monitoring device for mechanical characteristics of circuit breaker Download PDF

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Publication number
CN106885983B
CN106885983B CN201510933435.6A CN201510933435A CN106885983B CN 106885983 B CN106885983 B CN 106885983B CN 201510933435 A CN201510933435 A CN 201510933435A CN 106885983 B CN106885983 B CN 106885983B
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China
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circuit
circuit breaker
phase
displacement sensor
current sensor
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CN201510933435.6A
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CN106885983A (en
Inventor
成月
戚启忠
张金波
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Jiangsu Dechun Power Electric Co ltd
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Jiangsu Dechun Power Electric Co ltd
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/327Testing of circuit interrupters, switches or circuit-breakers
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01MTESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M13/00Testing of machine parts

Abstract

The invention relates to an on-line monitoring device for mechanical characteristics of a circuit breaker, which comprises an A-phase grating displacement sensor, a B-phase grating displacement sensor, a C-phase grating displacement sensor, an A-phase current sensor, a B-phase current sensor, a C-phase current sensor, a watchdog circuit, a microprocessor circuit, a display circuit, a key circuit, a clock circuit, a power circuit, a communication interface circuit, a switch control circuit, a switch circuit, a 3VDC voltage source and a circuit breaker mechanical performance detection loop, wherein the A-phase grating displacement sensor is connected with the B-phase current sensor; the device can greatly improve the reliability of a power supply and distribution system, ensure the safe operation of the circuit breaker, can find problems in time, improve the maintenance efficiency, and has very important significance for reducing the waste of manpower and material resources.

Description

On-line monitoring device for mechanical characteristics of circuit breaker
Technical Field
The invention relates to a device for judging the just opening and just closing points of a circuit breaker by using a voltage excitation method and realizing the online monitoring of mechanical characteristics of the circuit breaker by combining a displacement sensor, which has very important significance for ensuring the safe operation of the circuit breaker.
Background
The switching equipment is used as important equipment in the power distribution network, plays the roles of switching on and off and switching off power supply, and is used for realizing transmission, switching power load and quitting fault equipment and line sections from a power system, thereby ensuring the safe operation of the power distribution network. The opening distance and the overtravel of the circuit breaker are two important indexes for checking the mechanical performance of the circuit breaker, and the mechanical abrasion condition of a contact of the circuit breaker can be indirectly judged through the overtravel, so that the opening distance and the overtravel index of the circuit breaker must be measured when the circuit breaker leaves a factory. The invention provides a device and a method for monitoring the mechanical characteristics of a circuit breaker on line, which are characterized in that a voltage excitation method is adopted for monitoring the opening distance and the overtravel in the off-line mechanical characteristics of the circuit breaker, namely, a small voltage signal is added in a circuit breaker loop when the mechanical characteristics of the circuit breaker are measured, and the opening point and the closing point, namely, the just opening point and the just closing point of the circuit breaker can be judged by measuring the current of the circuit breaker loop, but the small voltage signal cannot be added in the operation process of the circuit breaker due to the existence of high voltage, so that the difficulty is brought to the on-line monitoring of the mechanical characteristics of the circuit breaker, therefore, the device and the method for monitoring the mechanical characteristics of the circuit breaker are provided, the device utilizes an additional measurement loop to construct a voltage excitation method measurement principle, combines a switch circuit, a displacement sensor and a straight-through current sensor to obtain the just opening point, the circuit breaker safe operation of guarantee can in time discover the problem, improves maintenance efficiency, to reducing the waste of manpower, material resources, has very important meaning.
Disclosure of Invention
The invention aims to solve the technical problems that how to utilize an external measurement loop to construct a voltage excitation method measurement principle, and combine a switch circuit, a displacement sensor and a straight-through current sensor to obtain the just opening and just closing point of a circuit breaker, and the mechanical characteristics of the circuit breaker are comprehensively judged in the total stroke so as to ensure the healthy and safe operation of the circuit breaker.
In order to solve the technical problem, the invention provides an online monitoring device for mechanical characteristics of a circuit breaker, which comprises an A-phase grating displacement sensor, a B-phase grating displacement sensor, a C-phase grating displacement sensor, an A-phase current sensor, a B-phase current sensor, a C-phase current sensor, a watchdog circuit, a microprocessor circuit, a display circuit, a key circuit, a clock circuit, a power circuit, a communication interface circuit, a switch control circuit, a switch circuit, a 3VDC voltage source and a circuit breaker mechanical performance detection loop; the output ends of the A-phase grating displacement sensor, the B-phase grating displacement sensor, the C-phase grating displacement sensor, the A-phase current sensor, the B-phase current sensor and the C-phase current sensor are respectively connected with the A/D end of the microprocessor circuit; the output ends of the watchdog circuit, the key circuit and the clock circuit are respectively connected with an I/O port of the microprocessor circuit; the input end of the display circuit is connected with the I/O port of the microprocessor circuit; the output end of the power supply circuit is connected with the power supply end of the microprocessor circuit; the input and output ends of the communication interface circuit are connected with the communication port of the microprocessor circuit; the input end of the switch control circuit is connected with an I/O port of the microprocessor circuit; the output end of the switch control circuit is connected with the coil end of the switch circuit; the output end of the 3VDC voltage source is connected with two pairs of contacts of the switch circuit and the mechanical performance detection loop of the circuit breaker in series.
The A-phase grating displacement sensor, the B-phase grating displacement sensor and the C-phase grating displacement sensor are arranged at a pull rod at the lower end of the circuit breaker, the grating is fixed on the base, and the circuit breaker opening and closing displacement-time curve of the circuit breaker is measured in a non-contact mode, so that the total stroke H, the action time t, the average closing speed and the average opening speed of the vacuum circuit breaker can be obtained.
The circuit breaker mechanical performance detection circuit comprises a vacuum circuit breaker, a switch circuit No. 1 contact, a switch circuit No. 2 contact, a 3VDC voltage source and a feed-through current sensor; the vacuum circuit breaker, switch circuit No. 1 contact, switch circuit No. 2 contact, 3VDC voltage source, punch-through current sensor all establish ties together and form the return circuit, judge the just minute of vacuum circuit breaker and just close the point with the electric voltage excitation method, when measuring first switch circuit No. 1 contact, switch circuit No. 2 contact closure, again with the vacuum circuit breaker closure or disconnection, just minute and just close the point that can judge the vacuum circuit breaker according to there being no change in the electric current in the return circuit, thereby obtain the opening distance H and the overtravel L of circuit breaker, and opening distance H + overtravel L be total stroke H, if the overtravel increase shows that the circuit breaker contact appears wearing and tearing, the standard overtravel is 3-5 mm.
The display circuit adopts a liquid crystal display for display, the display contents mainly comprise three-phase average closing speed of the circuit breaker, three-phase average opening speed, three-phase opening distance, three-phase overtravel, circuit breaker action times, circuit breaker opening and closing displacement-time curves and envelope lines, and if the envelope lines of the circuit breaker opening and closing displacement-time curves exceed 3% of soil of the envelope lines of the circuit breaker opening and closing displacement-time curves recorded when the circuit breaker is just put into operation, the circuit breaker is recommended to be subjected to power failure maintenance; if the three-phase average closing speed and the three-phase average opening speed of the circuit breaker exceed the standard values, namely the standard value of the three-phase average closing speed of the circuit breaker is 0.4-0.8m/s, and the standard value of the three-phase average opening speed of the circuit breaker is 0.9-1.3m/s, and if the three-phase average opening speed of the circuit breaker exceeds the range, the circuit breaker is recommended to be subjected to power failure maintenance; the accumulated value of the action times of the circuit breaker can reflect the mechanical service life of the circuit breaker, and the rated value of the action times of the vacuum bubble of the circuit breaker is 10000 times.
The switching circuit is a 5VDC operating electromagnetic relay with 2 pairs of normally open and normally closed contacts.
The power supply circuit adopts alternating current and direct current 90-260V for power supply.
The phase A cross-core current sensor, the phase B cross-core current sensor and the phase C cross-core current sensor are all cross-core Hall current transformers.
The invention has the positive effects that: (1) by constructing an external loop and utilizing a voltage excitation method to judge the rigid opening and closing points of the vacuum circuit breaker, the measurement of overtravel and open distance is realized; (2) judging whether a mechanical structure of the circuit breaker has a problem or not according to an envelope curve mark of a switching-off displacement-time curve of the circuit breaker; (3) judging the mechanical life of the circuit breaker according to the accumulated value of the action times of the circuit breaker; (4) and judging whether the mechanical structure of the circuit breaker has problems or not according to the three-phase average closing speed and the three-phase average opening speed of the circuit breaker.
Drawings
Fig. 1 is a schematic structure diagram of an online monitoring device for mechanical characteristics of a circuit breaker.
Fig. 2 is a schematic diagram of the circuit breaker mechanical performance detection circuit.
Detailed Description
As shown in the attached figure 1, the on-line monitoring device for the mechanical characteristics of the circuit breaker comprises an A-phase grating displacement sensor, a B-phase grating displacement sensor, a C-phase grating displacement sensor, an A-phase current sensor, a B-phase current sensor, a C-phase current sensor, a watchdog circuit, a microprocessor circuit, a display circuit, a key circuit, a clock circuit, a power circuit, a communication interface circuit, a switch control circuit, a switch circuit, a 3VDC voltage source and a circuit breaker mechanical performance detection circuit; the output ends of the A-phase grating displacement sensor, the B-phase grating displacement sensor, the C-phase grating displacement sensor, the A-phase current sensor, the B-phase current sensor and the C-phase current sensor are respectively connected with the A/D end of the microprocessor circuit; the output ends of the watchdog circuit, the key circuit and the clock circuit are respectively connected with an I/O port of the microprocessor circuit; the input end of the display circuit is connected with the I/O port of the microprocessor circuit; the output end of the power supply circuit is connected with the power supply end of the microprocessor circuit; the input and output ends of the communication interface circuit are connected with the communication port of the microprocessor circuit; the input end of the switch control circuit is connected with an I/O port of the microprocessor circuit; the output end of the switch control circuit is connected with the coil end of the switch circuit; the output end of the 3VDC voltage source is connected with two pairs of contacts of the switch circuit and the mechanical performance detection loop of the circuit breaker in series.
The A-phase grating displacement sensor, the B-phase grating displacement sensor and the C-phase grating displacement sensor are arranged at a pull rod at the lower end of the circuit breaker, the grating is fixed on the base, and the circuit breaker opening and closing displacement-time curve of the circuit breaker is measured in a non-contact mode, so that the total stroke H, the action time t, the average closing speed and the average opening speed of the vacuum circuit breaker can be obtained.
As shown in fig. 2, the circuit breaker mechanical performance detection circuit comprises a vacuum circuit breaker, a switch circuit No. 1 contact, a switch circuit No. 2 contact, a 3VDC voltage source and a feed-through current sensor; the vacuum circuit breaker, switch circuit No. 1 contact, switch circuit No. 2 contact, 3VDC voltage source, punch-through current sensor all establish ties together and form the return circuit, judge the just minute of vacuum circuit breaker and just close the point with the electric voltage excitation method, when measuring first switch circuit No. 1 contact, switch circuit No. 2 contact closure, again with the vacuum circuit breaker closure or disconnection, just minute and just close the point that can judge the vacuum circuit breaker according to there being no change in the electric current in the return circuit, thereby obtain the opening distance H and the overtravel L of circuit breaker, and opening distance H + overtravel L be total stroke H, if the overtravel increase shows that the circuit breaker contact appears wearing and tearing, the standard overtravel is 3-5 mm.
The display circuit adopts a liquid crystal display for display, the display contents mainly comprise three-phase average closing speed of the circuit breaker, three-phase average opening speed, three-phase opening distance, three-phase overtravel, circuit breaker action times, circuit breaker opening and closing displacement-time curves and envelope lines, and if the envelope lines of the circuit breaker opening and closing displacement-time curves exceed 3% of soil of the envelope lines of the circuit breaker opening and closing displacement-time curves recorded when the circuit breaker is just put into operation, the circuit breaker is recommended to be subjected to power failure maintenance; if the three-phase average closing speed and the three-phase average opening speed of the circuit breaker exceed the standard values, namely the standard value of the three-phase average closing speed of the circuit breaker is 0.4-0.8m/s, and the standard value of the three-phase average opening speed of the circuit breaker is 0.9-1.3m/s, and if the three-phase average opening speed of the circuit breaker exceeds the range, the circuit breaker is recommended to be subjected to power failure maintenance; the accumulated value of the action times of the circuit breaker can reflect the mechanical service life of the circuit breaker, and the rated value of the action times of the vacuum bubble of the circuit breaker is 10000 times.
The switching circuit is a 5VDC operating electromagnetic relay with 2 pairs of normally open and normally closed contacts.
The power supply circuit adopts alternating current and direct current 90-260V for power supply.
The phase A cross-core current sensor, the phase B cross-core current sensor and the phase C cross-core current sensor are all cross-core Hall current transformers.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that, for those skilled in the art, numerous modifications and refinements are possible without departing from the inventive concept, and such modifications and refinements should be considered as within the scope of the inventive concept.

Claims (2)

1. The circuit breaker mechanical characteristic on-line monitoring device is characterized in that: the system comprises an A-phase grating displacement sensor, a B-phase grating displacement sensor, a C-phase grating displacement sensor, an A-phase current sensor, a B-phase current sensor, a C-phase current sensor, a watchdog circuit, a microprocessor circuit, a display circuit, a key circuit, a clock circuit, a power circuit, a communication interface circuit, a switch control circuit, a switch circuit and a circuit breaker mechanical performance detection circuit; the output ends of the A-phase grating displacement sensor, the B-phase grating displacement sensor, the C-phase grating displacement sensor, the A-phase current sensor, the B-phase current sensor and the C-phase current sensor are respectively connected with the A/D end of the microprocessor circuit; the phase A cross-core current sensor, the phase B cross-core current sensor and the phase C cross-core current sensor are all cross-core Hall current transformers; the output ends of the watchdog circuit, the key circuit and the clock circuit are respectively connected with an I/O port of the microprocessor circuit; the input end of the display circuit is connected with the I/O port of the microprocessor circuit; the output end of the power supply circuit is connected with the power supply end of the microprocessor circuit; the power supply circuit adopts alternating current and direct current 90-260V for power supply; the input and output ends of the communication interface circuit are connected with the communication port of the microprocessor circuit; the input end of the switch control circuit is connected with an I/O port of the microprocessor circuit; the output end of the switch control circuit is connected with the coil end of the switch circuit; the switch circuit is a 5VDC working electromagnetic relay with 2 pairs of normally open and normally closed contacts;
the circuit breaker mechanical performance detection circuit comprises a circuit breaker, a switch circuit No. 1 contact, a switch circuit No. 2 contact, a 3VDC voltage source and phase-through current sensors; the circuit breaker, the No. 1 contact of the switch circuit, the No. 2 contact of the switch circuit, the 3VDC voltage source and the phase-through current sensors are all connected in series to form a loop; the circuit breaker is a vacuum circuit breaker, the rigid breaking point and the rigid closing point of the vacuum circuit breaker are judged by using a voltage excitation method, the No. 1 contact of a switch circuit and the No. 2 contact of the switch circuit are closed during measurement, then the vacuum circuit breaker is closed or disconnected, the rigid breaking point and the rigid closing point of the vacuum circuit breaker can be judged according to the fact that the current in a loop is changed, so that the opening distance H and the overtravel L of the circuit breaker are obtained, the opening distance H + the overtravel L is equal to the total stroke H, if the overtravel is increased, the contact of the circuit breaker is abraded, and the standard overtravel is 3-5 mm;
the A-phase grating displacement sensor, the B-phase grating displacement sensor and the C-phase grating displacement sensor are arranged at a pull rod at the lower end of the circuit breaker, the grating is fixed on the base, and the circuit breaker opening and closing displacement-time curve of the circuit breaker is measured in a non-contact mode, so that the total stroke H, the action time t, the average closing speed and the average opening speed of the vacuum circuit breaker can be obtained.
2. The on-line monitoring device for mechanical characteristics of circuit breakers of claim 1, characterized in that: the display circuit adopts a liquid crystal screen for display.
CN201510933435.6A 2015-12-15 2015-12-15 On-line monitoring device for mechanical characteristics of circuit breaker Active CN106885983B (en)

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CN107478985B (en) * 2017-08-21 2020-10-09 河海大学常州校区 On-load tap-changer state on-line monitoring device and monitoring method thereof for transformer
CN107656197A (en) * 2017-08-23 2018-02-02 中国电子科技集团公司第四十研究所 The implementation method of switching times is switched in a kind of programming count switching network
CN107870299B (en) * 2017-10-12 2020-03-31 温州大学 Detection device and detection method for tripping mechanism of molded case circuit breaker
CN107861058A (en) * 2017-11-07 2018-03-30 山东泰开高压开关有限公司 A kind of measurement apparatus and measuring method of vacuum circuit breaker divide-shut brake speed
CN108646175A (en) * 2018-04-17 2018-10-12 国网湖南省电力有限公司 High Voltage Circuit Breaker Contacts overtravel dynamic on-line measuring device and its application process
CN109884522A (en) * 2019-03-29 2019-06-14 云南电网有限责任公司电力科学研究院 Just divide the device and method just closed based on contactless live detection breaker

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Publication number Priority date Publication date Assignee Title
WO2003073577A1 (en) * 2002-02-28 2003-09-04 Siemens Aktiengesellschaft Testing arrangement for a power circuit breaker provided with an electronic trip element
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