CN114843150A - Judging device for opening and closing state of breaker opening and closing mechanical contact and breaker - Google Patents
Judging device for opening and closing state of breaker opening and closing mechanical contact and breaker Download PDFInfo
- Publication number
- CN114843150A CN114843150A CN202210628853.4A CN202210628853A CN114843150A CN 114843150 A CN114843150 A CN 114843150A CN 202210628853 A CN202210628853 A CN 202210628853A CN 114843150 A CN114843150 A CN 114843150A
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- Prior art keywords
- circuit breaker
- breaker
- contact
- switching
- end part
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
- G01R31/3275—Fault detection or status indication
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
- G01R31/3272—Apparatus, systems or circuits therefor
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/04—Means for indicating condition of the switching device
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/20—Systems supporting electrical power generation, transmission or distribution using protection elements, arrangements or systems
Abstract
The invention relates to a judging device for the on-off state of a breaker on-off mechanical contact and a breaker, comprising a linkage contact rod fixed at the end part of a transmission shaft of the breaker, wherein a first static contact and a second static contact are respectively arranged at two sides of the end part of the linkage contact rod; when the breaker is opened, the transmission shaft drives the end part of the linkage contact rod to be only contacted with the second static contact; the first stationary contact and the second stationary contact are connected with an I/O interface of the singlechip through a signal processing circuit; the single chip microcomputer judges the switching-on and switching-off states of the circuit breaker in real time according to signals received by the I/O interface so as to control the conduction time of the current of the permanent magnet coil of the circuit breaker and finish the intelligent control of the circuit breaker.
Description
Technical Field
The invention belongs to the technical field of state monitoring of power transmission and transformation equipment, and relates to a judging device for the on-off state of a breaker on-off mechanical contact and a working method thereof.
Background
In the high-voltage switch of the electric power system, most of the vacuum circuit breakers adopting the permanent magnetic mechanism switch have the advantages of few mechanical parts, long service life, no maintenance, stability, reliability, reliable operation of the mechanism and high brake opening speed.
When a permanent magnet coil of an existing circuit breaker (including a vacuum circuit breaker) is electrified to work, a transmission shaft of the circuit breaker is driven to move axially under the action of electromagnetic force, and the purpose of switching on and off is achieved. However, in the switching-on and switching-off process, mechanical jitter exists, and how to accurately judge the switching-on and switching-off positions of the circuit breaker in real time so that the circuit breaker works in the best condition is a technical problem in the field. As shown in fig. 1, the waveform shown in fig. 1 is a current state waveform in the permanent magnet coil detected when the circuit breaker is switched on and switched off, the actual waveform is mixed with a lot of stray interference or noise waves caused by mechanical jitter, and if the noise waves disappear, the on-off state of the circuit breaker is judged, a time delay is bound to occur, and the accurate control of the circuit breaker is influenced.
The existing design adopts a displacement sensor or a Hall sensor with high cost to realize the aim, the cost of the methods is high, and the circuit breaker generates mechanical vibration in the action process and is easy to generate misjudgment.
Disclosure of Invention
The invention aims to provide a judging device for judging the on-off state of a breaker on-off mechanical contact and a working method thereof, which have the advantages of higher accuracy and reliability, difficulty in misjudgment and lower cost.
In order to solve the above technical problem, the present invention provides a device for determining the on/off state of a breaker on/off mechanical contact, comprising: the circuit breaker comprises a linkage contact rod 11 fixed at the end part of a transmission shaft 1 of the circuit breaker, wherein a first stationary contact 2 and a second stationary contact 3 are respectively arranged at two sides of the end part of the linkage contact rod 11, and when the circuit breaker is switched on, the transmission shaft 1 drives the end part of the linkage contact rod 11 to be only contacted with the first stationary contact 2; when the breaker is opened, the transmission shaft drives the end part of the linkage contact rod 11 to only contact with the second stationary contact 3; the first and second stationary contacts are connected with an I/O interface of the singlechip through a signal processing circuit (preferably a photoelectric isolation circuit or a magnetic coupling isolation or an A/D conversion circuit); the single chip microcomputer judges the switching-on and switching-off states of the circuit breaker in real time according to signals received by the I/O interface, and once the switching-on and switching-off states of the circuit breaker are judged to be in place, the single chip microcomputer cuts off the working current of the permanent magnet coil of the circuit breaker to finish the intelligent control of the circuit breaker.
The working method of the single chip microcomputer comprises the following steps: establishing a detection window with a fixed time interval in a software space, wherein the time window fully utilizes an accurate timer in an MCU (microprogrammed control Unit), the opening and closing state of the circuit breaker is tested at intervals of 0.5ms, 0 and 1 respectively representing the opening and closing state are sequentially recorded in a 32-bit file register shown in figure 4, the 32-bit file register corresponds to the recorded value of the time window, 32-bit equally-spaced 0 and 1 states are recorded together, and the total time is 16ms of the window; the window continuously removes the old recorded value and records the latest value by adopting the first-in first-out principle as the time goes on, after each new value is recorded,
equation 1:
wherein: CNT is a counting value, Bt is the value of each bit in a file register with 32 bits, and t is a time interval of 0.5 ms;
equation 2: closing threshold H TH ＝k H .CNT
Wherein k is H A closing threshold coefficient of 0.75 (obtained after averaging experimental data);
equation 3: switching-off threshold F TH ＝k T .CNT
Wherein k is T The opening threshold coefficient is 0.25 (obtained by averaging experimental data);
counting the number of 1 states according to the formula 1, and when the threshold value H is closed TH When the current is greater than a preset closing threshold value, judging that the current is in a closing state; when the switching-off threshold value F TH When the current value is less than the preset opening threshold value, the judgment is thatOpening the brake; the method can eliminate accidental interference, accurately distinguish mechanical shaking interference and accurately judge the point of the change of the opening and closing positions of the circuit breaker.
An operating method of a circuit breaker applying the judging device comprises the following steps: when the single chip microcomputer receives a switching-on or switching-off control signal, a PWM module in the single chip microcomputer sends a pulse width adjustable signal to an IGBT driving circuit so as to drive a permanent magnet coil of the circuit breaker to work and further control a transmission shaft of the circuit breaker to displace so as to implement switching-on or switching-off action of the circuit breaker; meanwhile, the single chip microcomputer judges the opening and closing state of the circuit breaker in real time according to signals received by the I/O interface, and once the opening and closing state of the circuit breaker is detected to be in place, the single chip microcomputer cuts off the working current of a permanent magnet coil of the circuit breaker.
The invention has the technical effects that: the sampling breaker mechanism in the judging device is provided with a linkage auxiliary contact. The on-off position judgment of the on-off brake of the high-voltage switch is realized, and compared with the prior art, the on-off position judgment method is low in cost, high in judgment accuracy and reliability and not prone to misjudgment. The invention judges the opening and closing positions of the circuit breaker in real time by using the linkage auxiliary contact of the mechanism, accurately and timely cuts off the working current of the permanent magnet coil, the singlechip receives a closing or opening state signal and sends a pulse width adjustable signal to an IGBT driving circuit through a PWM module in the singlechip to drive the permanent magnet coil of the circuit breaker to work, meanwhile, the singlechip detects the opening and closing positions of the circuit breaker in real time by using the linkage auxiliary contact of the mechanism, once the circuit breaker is opened and closed in place, the singlechip cuts off the working current of the coil, and the coil is prevented from being electrified for a long time to cause damage. The working process of the invention can greatly avoid the influence of ripples and burrs in the judging process and improve the brake closing and opening judging precision.
Drawings
In order that the invention may be more clearly understood, the following detailed description of the invention is given in conjunction with the accompanying drawings and the specific embodiments:
fig. 1 is a diagram of current waveforms in a permanent magnet coil from closing to opening of a conventional circuit breaker;
fig. 2 is a schematic structural diagram of a judging device for judging the on-off state of the on-off mechanical contact of the circuit breaker according to the present invention;
fig. 3 is a schematic diagram of a time window from closing to opening of the circuit breaker of the present invention;
FIG. 4 is a schematic diagram of the 32-bit file register of the present invention recording status signals at equal intervals in a first-in first-out manner;
FIG. 5 is a schematic block circuit diagram of the judging means of the present invention;
fig. 6 is a circuit schematic of the signal processing circuit of the present invention.
Detailed Description
As shown in fig. 1 to 6, the device for determining the opening/closing state of the opening/closing mechanical contact of the circuit breaker of this embodiment includes: the circuit breaker comprises a linkage contact rod 11 fixed at the end part of a transmission shaft 1 of the circuit breaker, wherein a first stationary contact 2 and a second stationary contact 3 are respectively arranged at two sides of the end part of the linkage contact rod 11, and when the circuit breaker is switched on, the transmission shaft drives the end part of the linkage contact rod 11 to be only contacted with the first stationary contact 2 and form a low-voltage direct-current loop; when the breaker is opened, the transmission shaft drives the end part of the linkage contact rod 11 to only contact with the second stationary contact 3, and another low-voltage direct-current loop is formed; the first and second stationary contacts are connected with an I/O interface of the singlechip through a signal processing circuit (preferably a photoelectric isolation circuit or a magnetic coupling isolation or an A/D conversion circuit); the single chip microcomputer judges the switching-on and switching-off states of the circuit breaker in real time according to signals received by the I/O interface so as to control the conduction time of the current of the permanent magnet coil L of the circuit breaker and finish the intelligent control of the circuit breaker.
The judging method of the judging device for the on-off state of the on-off mechanical contact of the circuit breaker comprises the working method of the single chip microcomputer, and specifically comprises the following steps: establishing a detection window with a fixed time interval in the software space of the singlechip, wherein the time window fully utilizes an accurate timer in the MCU, tests the opening and closing state of the circuit breaker every 0.5ms, and sequentially records 0 and 1 respectively representing the opening and closing state in a 32-bit file register shown in figure 4, wherein the 32-bit file register is corresponding to the recorded value of the time window, and totally records the 0 and 1 states of 32 equal intervals, and the total is 16ms of window; the window continuously removes the old recorded value and records the latest value by adopting the first-in first-out principle as the time goes on, after each new value is recorded,
equation 1:
wherein: CNT is a counting value, Bt is the value of each bit in a file register with 32 bits, and t is a time interval of 0.5 ms;
equation 2: closing threshold H TH ＝k H .CNT
Wherein k is H A closing threshold coefficient of 0.75 (obtained after averaging experimental data);
equation 3: switching-off threshold F TH ＝k T .CNT
Wherein k is T The opening threshold coefficient is 0.25 (obtained by averaging experimental data);
counting the number of 1 states according to the formula 1, and when the threshold value H is closed TH When the current is greater than a preset closing threshold value, judging that the current is in a closing state; when the switching-off threshold value F TH When the current value is less than a preset brake opening threshold value, the brake opening state is judged; the method can eliminate accidental interference, accurately distinguish mechanical shaking interference and accurately judge the point of the change of the opening and closing positions of the circuit breaker.
As alternative embodiments, the file register may also use 24, 48, 64 or 128 bits, and the interval 0.5ms may be adjusted accordingly. The single chip microcomputer is preferably an M4, M5, M6 or M7 single chip microcomputer.
Referring to fig. 5, the linkage auxiliary contact of the mechanism is used for judging the opening and closing state of the circuit breaker in real time, so that the working current of the permanent magnet coil is accurately and timely cut off. The specific working process is as follows: when the singlechip receives a switching-on or switching-off control signal, a pulse width adjustable signal is sent to an IGBT driving circuit through a PWM module in the singlechip so as to drive a permanent magnet coil of a breaker to work, and further, the transmission shaft displacement is controlled so as to implement switching-on or switching-off actions; meanwhile, the single chip microcomputer judges the opening and closing state of the circuit breaker in real time according to signals received by the I/O interface, and once the circuit breaker is judged to be opened or closed in place, the single chip microcomputer cuts off the working current of the permanent magnet coil, so that the permanent magnet coil is prevented from being damaged due to long-time electrification. The working process of the invention can greatly avoid the influence of ripples and burrs in the judging process and improve the brake closing and opening judging precision.
As in fig. 6, the signal processing circuit: a low-voltage direct-current power supply is applied to a loop where the end part of the linkage feeler lever is located, signals flow through a resistor R1 and a resistor R2 to enable an optical coupler to be switched on or off, a 0 or 1 digital signal level is generated and sent to an I/O interface of a single chip microcomputer, the single chip microcomputer samples circuit breaker combination and division signals at equal intervals in real time, mechanical jitter and random interference signals are removed through a window algorithm, and accurate judgment is achieved. In the figure, C1 is a hardware filter, VD1 is a high-voltage interference clamp circuit, and R3 is an optocoupler current-limiting protection resistor.
It should be understood that the above examples are only for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And such obvious variations or modifications which fall within the spirit of the invention are intended to be covered by the scope of the present invention.
Claims (4)
1. A judging device for the on-off state of a breaker on-off mechanical contact is characterized by comprising a linkage contact rod fixed at the end part of a transmission shaft of a breaker, wherein a first static contact and a second static contact are respectively arranged on two sides of the end part of the linkage contact rod;
when the circuit breaker is switched on, the transmission shaft drives the end part of the linkage contact rod to be only contacted with the first static contact; when the breaker is opened, the transmission shaft drives the end part of the linkage contact rod to be only contacted with the second static contact; the first stationary contact and the second stationary contact are connected with an I/O interface of the singlechip through a signal processing circuit; the single chip microcomputer judges the switching-on and switching-off states of the circuit breaker in real time according to signals received by the I/O interface, and once the switching-on and switching-off states of the circuit breaker are judged to be in place, the single chip microcomputer cuts off the working current of the permanent magnet coil of the circuit breaker.
2. The judgment device according to claim 1, wherein: the signal processing circuit is two photoelectric isolation circuits or two magnetic coupling isolation circuits or two A/D conversion circuits.
3. The judgment device according to claim 2, wherein: the signal processing circuit includes: a low-voltage direct-current power supply is applied to a loop where the end part of the linkage contact rod is located, and when the end part of the linkage contact rod is in contact with the first contact or the second contact, a signal flows through the resistor R1 and the resistor R2 to enable the optical coupler to be conducted; on the contrary, the optocoupler is closed to generate a digital signal level of 0 or 1, the digital signal level is sent to an I/O interface of the singlechip, and the singlechip samples the circuit breaker switching signal at equal intervals in real time; a filter capacitor C1 and a voltage stabilizing tube VD1 for high-voltage interference clamping are connected in parallel between the connection point of the resistor R1 and the resistor R2 and the reference ground, and an optical coupler current limiting protection resistor R3 is connected in parallel between the current input end and the current output end of the optical coupler.
4. A circuit breaker to which the determination device of claim 3 is applied, comprising: when the single chip microcomputer receives a switching-on or switching-off control signal, a PWM module in the single chip microcomputer sends a pulse width adjustable signal to an IGBT driving circuit so as to drive a permanent magnet coil of the circuit breaker to work and further control a transmission shaft of the circuit breaker to displace so as to implement switching-on or switching-off action of the circuit breaker; meanwhile, the single chip microcomputer judges the opening and closing state of the circuit breaker in real time according to signals received by the I/O interface, and once the opening and closing state of the circuit breaker is detected to be in place, the single chip microcomputer cuts off the working current of the permanent magnet coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210628853.4A CN114843150A (en) | 2020-12-31 | 2020-12-31 | Judging device for opening and closing state of breaker opening and closing mechanical contact and breaker |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210628853.4A CN114843150A (en) | 2020-12-31 | 2020-12-31 | Judging device for opening and closing state of breaker opening and closing mechanical contact and breaker |
| CN202011638659.1A CN112750638B (en) | 2020-12-31 | 2020-12-31 | Judging device for on-off state of breaker on-off mechanical contact and working method |
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| CN202011638659.1A Division CN112750638B (en) | 2020-12-31 | 2020-12-31 | Judging device for on-off state of breaker on-off mechanical contact and working method |
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| CN114843150A true CN114843150A (en) | 2022-08-02 |
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| CN202011638659.1A Active CN112750638B (en) | 2020-12-31 | 2020-12-31 | Judging device for on-off state of breaker on-off mechanical contact and working method |
| CN202210629078.4A Pending CN114994524A (en) | 2020-12-31 | 2020-12-31 | Working method of circuit breaker |
| CN202210628853.4A Pending CN114843150A (en) | 2020-12-31 | 2020-12-31 | Judging device for opening and closing state of breaker opening and closing mechanical contact and breaker |
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| CN202011638659.1A Active CN112750638B (en) | 2020-12-31 | 2020-12-31 | Judging device for on-off state of breaker on-off mechanical contact and working method |
| CN202210629078.4A Pending CN114994524A (en) | 2020-12-31 | 2020-12-31 | Working method of circuit breaker |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116819299A (en) * | 2023-03-27 | 2023-09-29 | 通号（长沙）轨道交通控制技术有限公司 | Operating mechanism data acquisition system and driving loop module and method thereof |
| CN117810016A (en) * | 2024-03-01 | 2024-04-02 | 江苏大灰熊科技有限公司 | High-voltage emergency breaker structure with state monitoring function |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN203444081U (en) * | 2013-08-20 | 2014-02-19 | 北京电研华源电力技术有限公司 | Monitoring and control system for permanent magnetic mechanism breaker |
| CN206848434U (en) * | 2017-05-31 | 2018-01-05 | 河南省高压电器研究所 | A kind of device for measuring the high-voltage circuit-breaker switching on-off time |
| CN111381158A (en) * | 2020-05-09 | 2020-07-07 | 国网江苏省电力有限公司宿迁供电分公司 | Circuit breaker divide-shut brake coil real-time supervision device |
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2020
- 2020-12-31 CN CN202011638659.1A patent/CN112750638B/en active Active
- 2020-12-31 CN CN202210629078.4A patent/CN114994524A/en active Pending
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| CN114994524A (en) | 2022-09-02 |
| CN112750638A (en) | 2021-05-04 |
| CN112750638B (en) | 2022-06-03 |
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