CN114220699A - High-voltage circuit breaker protection device and method based on non-electric quantity information - Google Patents
High-voltage circuit breaker protection device and method based on non-electric quantity information Download PDFInfo
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- CN114220699A CN114220699A CN202111289285.1A CN202111289285A CN114220699A CN 114220699 A CN114220699 A CN 114220699A CN 202111289285 A CN202111289285 A CN 202111289285A CN 114220699 A CN114220699 A CN 114220699A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/02—Details
- H01H33/26—Means for detecting the presence of an arc or other discharge
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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
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- Arc-Extinguishing Devices That Are Switches (AREA)
Abstract
A high-voltage circuit breaker protection device and method based on non-electric quantity information comprises an arc extinguish chamber gas pressure switch, an arc light sensor and a temperature sensor which are arranged in an arc extinguish chamber of a circuit breaker, wherein a current transformer is arranged on a conductor close to a stationary contact end outside the arc extinguish chamber of the circuit breaker. Through at the indoor installation explosion chamber gas pressure switch of high voltage circuit breaker arc extinguishing, the arc light sensor, temperature sensor and current transformer, detect through the effect that the inside production of circuit breaker lasts electric arc and brings, thereby judge through the logic whether trigger circuit breaker protection action, can avoid the only protect function of this kind of causal factor of "operating device spring pressure is low/the oil pressure is low", "explosion chamber SF gas pressure is low" of current circuit breaker, and can not prevent the electric arc because of other factors lead to, can protect high voltage circuit breaker better.
Description
Technical Field
The invention relates to the field of high-voltage power transmission equipment, in particular to a high-voltage circuit breaker protection device and method based on non-electric quantity information.
Background
The circuit breaker is a switching device capable of closing, carrying and opening/closing a current under a normal circuit condition and a current under an abnormal circuit condition within a specified time, and is generally connected in series in an electric main circuit to operate live equipment or to remove a fault under an abnormal condition to protect safety of the main equipment.
The breaker cuts off short-circuit current and mainly relies on the arc extinguishing ability of explosion chamber, and when the arc extinguishing ability was not enough, the circuit breaker switching-off should be forbidden to avoid the fracture arcing can't extinguish and lead to the circuit breaker disintegration explosion, cause huge loss.
In the current common design concept, "the operating mechanism spring pressure is low/the oil pressure is low" and "the arc-extinguishing chamber SF6 gas pressure is low" are generally adopted as the conditions for opening and closing the circuit breaker. The method can only avoid breaker accidents caused by opening of the breaker under the two conditions of insufficient spring pressure and insufficient SF6 pressure, and has no case for judging the protection of the breaker body for important signals such as overhigh contact temperature, overlarge gas chamber pressure, overlong arc duration and the like.
In recent two years, some cases are developed in China continuously, the reasons and the processes are consistent, firstly, only an arc contact is closed and a main contact is not closed when a breaker operating mechanism breaks down to cause closing; then, an arc contact is heated and melted under the strong negative charge current of tens of thousands of amperes, surrounding gas is decomposed, and insulation is reduced; and finally, the arc extinguishing chamber conductor discharges to the ground, the relay protection action trips, and the circuit breaker is disassembled and exploded due to the fact that the arc extinguishing capability is lost.
The case shows that in the high-voltage circuit breaker control circuit, the conditions of 'low operating mechanism spring pressure/low oil pressure' and 'low arc extinguish chamber SF6 gas pressure' are far from enough to be used as the conditions for closing and opening the circuit breaker.
For example, chinese patent document CN 110376514a discloses a method for evaluating the comprehensive performance of a dc high-speed switch, which tests the external insulation performance, the breaking performance, the mechanical performance, and the current carrying performance of the dc high-speed switch through a continuous test of the dc high-speed switch, and through such a research on the switch itself, the protection of the circuit breaker can be performed by reference.
Disclosure of Invention
The invention aims to solve the technical problem of providing a high-voltage circuit breaker protection device and method based on non-electric quantity information, which make full use of various non-electric quantity signals of a circuit breaker body to perform multi-dimensional combination judgment, eliminate the risks and ensure the safe operation of power equipment.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
the utility model provides a high voltage circuit breaker protection device based on non-electric quantity information, is including installing explosion chamber gas pressure switch, arc light sensor and the temperature sensor in the circuit breaker arc chamber, is close to outside the circuit breaker arc chamber and is equipped with current transformer on the stationary contact end conductor, and explosion chamber gas pressure switch, arc light sensor, temperature sensor and current transformer are connected with the input of logic judgement unit, and logic judgement unit output can outwards send alarm signal and start circuit breaker failure protection signal.
The logic judgment unit is in communication connection with the man-machine interaction module, the arc sensor, the temperature sensor and the current transformer are connected with the analog input module after signal conversion is carried out on the arc sensor, the temperature sensor and the current transformer through the transmitter, and the analog input module is electrically connected with the logic judgment unit.
The output end of the logic judgment unit is provided with an alarm signal relay and a breaker failure protection execution relay for sending out an alarm signal and executing protection action.
The protection method of the high-voltage circuit breaker protection device based on the non-electric quantity information comprises the following steps:
step one, a circuit breaker is disconnected, arc extinguishing chamber gas pressure overrun time t1, arc signal duration time t2, temperature overrun time t3, circuit breaker load current overrun time t4 and protection starting delay time t5 are set on a man-machine interaction module, and the current pressure, the temperature limit value and the load current limit value of the arc extinguishing chamber are set according to the type and the load characteristics of the circuit breaker;
step two, the circuit breaker is switched on, the gas pressure switch of the arc extinguish chamber detects whether the gas pressure in the arc extinguish chamber is over the set value, when the gas pressure exceeds the set value, the switch closing point is disconnected, the logic judgment unit receives a disconnection signal and a pressure overrun signal and starts to time and compares the disconnection signal and the pressure overrun signal with the time t1, the arc light sensor detects the arc light signal in the arc extinguish chamber, the analog input module receives the arc light signal and transmits the arc light signal to the logic judgment unit to time, the timing time is compared with t2, the temperature sensor detects the temperature in the arc extinguish chamber, the analog input module receives the temperature signal and transmits the temperature signal to the logic judgment unit, if the temperature exceeds the limit value, timing is started and compared with t3, the current transformer collects three-phase current information of the circuit breaker, the analog input module receives the current and transmits the current to the logic judgment unit, and if the current exceeds the set limit value, timing is started and compared with time t 4;
and step three, when any one or more of the gas pressure exceeding time in the arc extinguishing chamber in the step two exceeds t1, the arc light signal duration time exceeds t2, the temperature exceeding time exceeds t3 and the circuit breaker load current out-of-limit time exceeds t4 are met, controlling an alarm signal relay to attract and send out an alarm signal, transmitting alarm content to a man-machine interaction module and displaying the alarm content, and when the four conditions are all met and are still met after the protection starting delay time t5, controlling the circuit breaker to fail and protect and execute the relay to attract, tripping all other circuit breakers ringing with the circuit breaker, realizing the electrical isolation of the fault circuit breaker, and protecting circuits.
In the third step, if only the gas pressure exceeding time in the arc extinguishing chamber exceeds t1, the pressure switch is judged to be abnormal or the pressure in the arc extinguishing chamber is judged to be abnormal, and the man-machine interaction module displays the pressure switch or the pressure in the arc extinguishing chamber to check the arc extinguishing device.
In the third step, if only the temperature overrun time exceeds t3 and the breaker load current overrun time exceeds t4, the load is judged to be overlarge, and the man-machine interaction module displays that the arc-extinguishing device is checked.
In the third step, only when the gas pressure exceeding time in the arc extinguishing chamber exceeds t1 and the arc signal duration time exceeds t2, the arc extinguishing capability of the circuit breaker is judged to be weakened, the contact is worn, and the man-machine interaction module displays that the arc extinguishing device is checked.
According to the high-voltage circuit breaker protection device and method based on non-electric quantity information, the arc extinguish chamber gas pressure switch, the arc light sensor, the temperature sensor and the current transformer are installed in the arc extinguish chamber of the high-voltage circuit breaker, the effect caused by continuous electric arc generated in the circuit breaker is detected, and therefore whether the circuit breaker protection action is triggered or not is judged logically, the protection functions of the traditional circuit breaker, namely the factors of low spring pressure/low oil pressure of an operating mechanism and low SF6 gas pressure of the arc extinguish chamber, can be avoided, electric arcs caused by other factors cannot be prevented, and the high-voltage circuit breaker can be protected better.
Drawings
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
fig. 1 is a schematic signal acquisition diagram of a high voltage circuit breaker of the present invention;
FIG. 2 is an electrical schematic of the present invention;
FIG. 3 is an enlarged partial view of the electrical schematic;
fig. 4 is a high voltage circuit breaker protection logic.
Wherein: the device comprises an arc extinguishing chamber gas pressure switch 1, an arc sensor 2, a temperature sensor 3, a current transformer 4, a logic judgment unit 5, a man-machine interaction module 51, an analog input module 52, a circuit breaker arc extinguishing chamber 6, an alarm signal relay 7 and a circuit breaker failure protection execution relay 8.
Detailed Description
The technical scheme of the invention is explained in detail in the following by combining the drawings and the embodiment.
As shown in fig. 1-3, a high-voltage circuit breaker protection device based on non-electric quantity information comprises an arc extinguish chamber gas pressure switch 1, an arc light sensor 2 and a temperature sensor 3 which are installed in an arc extinguish chamber 6 of a circuit breaker, wherein a current transformer 4 is arranged on a conductor close to a stationary contact end outside the arc extinguish chamber 6 of the circuit breaker, the arc extinguish chamber gas pressure switch 1, the arc light sensor 2, the temperature sensor 3 and the current transformer 4 are connected with an input end of a logic judgment unit 5, and an output end of the logic judgment unit 5 can send out an alarm signal and a circuit breaker failure protection signal.
The logic judgment unit 5 is in communication connection with the human-computer interaction module 51, the arc sensor 2, the temperature sensor 3 and the current transformer 4 are in signal conversion through the transmitter and then are connected with the analog input module 52, and the analog input module 52 is electrically connected with the logic judgment unit 5.
The output end of the logic judgment unit 5 is provided with an alarm signal relay 7 and a breaker failure protection execution relay 8 which are used for sending out an alarm signal and executing protection actions.
The protection method of the high-voltage circuit breaker protection device based on the non-electric quantity information comprises the following steps:
step one, a circuit breaker is disconnected, arc extinguishing chamber gas pressure overrun time t1, arc light signal duration time t2, temperature overrun time t3, circuit breaker load current overrun time t4 and protection starting delay time t5 are set on a man-machine interaction module 51, and the current pressure, temperature limit value and load current limit value of the arc extinguishing chamber are set according to the type and load characteristics of the circuit breaker;
step two, the circuit breaker is switched on, the arc extinguish chamber gas pressure switch 1 detects whether the gas pressure in the arc extinguish chamber is over a set value, when the gas pressure exceeds the set value, the switch closing point is disconnected, the logic judgment unit 5 receives a disconnection signal and a pressure overrun signal and starts to time and compares the time with the time t1, the arc sensor 2 detects the arc signal in the arc extinguish chamber, the analog quantity input module 52 receives the arc signal and transmits the arc signal to the logic judgment unit 5 for timing, the timing time is compared with the time t2, the temperature sensor 3 detects the temperature in the arc extinguish chamber, the analog quantity input module 52 receives the temperature signal and transmits the temperature signal to the logic judgment unit 5, if the temperature overrun starts to time and compares with the time t3, the current transformer 4 collects the three-phase current information of the circuit breaker, the analog quantity input module 52 receives the current and transmits the current to the logic judgment unit 5, if the current exceeds the set limit value, starting timing and comparing with the time t 4;
and step three, when any one or more of the gas pressure exceeding time in the arc extinguishing chamber in the step two exceeds t1, the arc signal duration time exceeds t2, the temperature exceeding time exceeds t3 and the circuit breaker load current out-of-limit time exceeds t4 are met, controlling the alarm signal relay 7 to attract and send out an alarm signal, transmitting alarm content to the man-machine interaction module 51 and displaying the alarm content, and when the four conditions are all met and are still met after the protection starting delay time t5, controlling the circuit breaker failure protection execution relay 8 to attract and trip all other circuit breakers ringing with the circuit breaker to realize the electrical isolation of the fault circuit breaker and protect the circuit.
In the third step, if only the gas pressure exceeding time in the arc extinguishing chamber exceeds t1, it is determined that the pressure switch is abnormal or the pressure in the arc extinguishing chamber is abnormal, and the man-machine interaction module 51 displays the result to check the arc extinguishing device.
In the third step, if only the temperature overrun time exceeds t3 and the breaker load current overrun time exceeds t4, the load is determined to be too large, and the man-machine interaction module 51 displays that the arc-extinguishing device is checked.
In the third step, if only the gas pressure exceeding time in the arc extinguishing chamber exceeds t1 and the arc signal duration exceeds t2, it is determined that the arc extinguishing capability of the circuit breaker is weakened and the contact is worn, and the man-machine interaction module 51 displays that the arc extinguishing device is checked.
The working principle of the device and the method is as follows:
when the high-voltage circuit breaker operating mechanism fault results in that only the arc contact is closed and the main contact is not closed, the circuit breaker contact can rapidly generate heat under strong negative charge current, meanwhile, surrounding gas is decomposed and expanded, the pressure inside the arc extinguish chamber can be rapidly increased and the temperature of a conductor can be rapidly increased under the two conditions, and an SF6 gas pressure gauge meter and a wireless temperature measuring sensor which are used for detecting the inside of the arc extinguish chamber can send the two non-electric quantity signals to the logic judgment unit. When the arc contact inside the arc extinguish chamber begins to melt and discharge, the arc sensor can capture the arc signal and simultaneously send the arc signal to the logic judgment unit. The logic judgment unit integrates the non-electric quantity signals and can make the judgment of the non-electric quantity protection action after corresponding time delay.
In order to prevent the misjudgment risk existing when the circuit breaker is stopped, the load current of the circuit breaker is introduced into the non-electric quantity protection logic judgment as the misjudgment prevention criterion. When the load current is smaller than the current fixed value, the breaker has no risk of explosion, and the related logic judgment is locked.
According to the current explosion case of the circuit breaker, the circuit breaker needs 30 minutes to 2 hours to accumulate enough energy for explosion after being closed. Therefore, the delay time values t1, t2, t3, t4 and t5 in the logic judgment unit can be set for a long time, such as about 30 seconds, so that the accuracy judgment requirement can be met, and the misoperation risk caused by the jump of the measurement element data can be prevented.
Claims (7)
1. The utility model provides a high voltage circuit breaker protection device based on non-electric quantity information, a serial communication port, including explosion chamber gas pressure switch (1) of installing in circuit breaker explosion chamber (6), arc light sensor (2) and temperature sensor (3), be close to on the stationary contact end conductor outside circuit breaker explosion chamber (6) current transformer (4), explosion chamber gas pressure switch (1), arc light sensor (2), temperature sensor (3) and current transformer (4) are connected with the input of logic judgement unit (5), logic judgement unit (5) output can outwards send alarm signal and start circuit breaker failure protection signal.
2. The protection device for the high-voltage circuit breaker based on the non-electric quantity information is characterized in that the logic judgment unit (5) is in communication connection with the man-machine interaction module (51), the arc sensor (2), the temperature sensor (3) and the current transformer (4) are connected with the analog quantity input module (52) after signal conversion is carried out on the arc sensor, the temperature sensor and the current transformer through the transmitters, and the analog quantity input module (52) is electrically connected with the logic judgment unit (5).
3. The high-voltage circuit breaker protection device based on non-electric quantity information is characterized in that the output end of the logic judgment unit (5) is provided with an alarm signal relay (7) and a circuit breaker failure protection execution relay (8) for sending an alarm signal and executing protection actions.
4. The protection method of the high-voltage circuit breaker protection device based on the non-electric quantity information as claimed in claim 3 is characterized by comprising the following steps:
step one, a circuit breaker is disconnected, the gas pressure overrun time t1 of an arc extinguish chamber, the arc light signal duration time t2, the temperature overrun time t3, the load current overrun time t4 of the circuit breaker and the protection starting delay time t5 are set on a man-machine interaction module (51), and the gas pressure, the temperature limit value and the load current limit value of the arc extinguish chamber are set according to the type and the load characteristics of the circuit breaker;
step two, a breaker is switched on, a gas pressure switch (1) of an arc extinguish chamber detects whether the gas pressure in the arc extinguish chamber passes a set value, when the gas pressure exceeds the set value, a switch closing point is disconnected, a logic judgment unit (5) receives a disconnection signal and a pressure overrun signal, starts timing and compares with time t1, an arc sensor (2) detects the arc signal in the arc extinguish chamber, an analog quantity input module (52) receives the arc signal and transmits the arc signal to the logic judgment unit (5) for timing, the timing time is compared with t2, a temperature sensor (3) detects the temperature in the arc extinguish chamber, an analog quantity input module (52) receives the temperature signal and transmits the temperature signal to the logic judgment unit (5), if the temperature overrun starts timing and compares with t3, a current transformer (4) collects three-phase current information of the breaker, the analog quantity input module (52) receives the current and transmits the current to the logic judgment unit (5), if the current exceeds the set limit value, starting timing and comparing with the time t 4;
and step three, when any one or more of the gas pressure exceeding time in the arc extinguishing chamber in the step two exceeds t1, the arc light signal duration time exceeds t2, the temperature exceeding time exceeds t3 and the circuit breaker load current exceeding time exceeds t4 are met, controlling an alarm signal relay (7) to suck and send out an alarm signal, transmitting alarm content to a man-machine interaction module (51) and displaying the alarm content, when the four conditions are all met, and the alarm content is still met after protection starting delay time t5, controlling a circuit breaker failure protection execution relay (8) to alarm, tripping all other circuit breakers of the circuit breaker, realizing electrical isolation of the fault circuit breaker, and protecting circuits.
5. The method for protecting the high-voltage circuit breaker based on the non-electric quantity information according to claim 4, wherein in the third step, only when the gas pressure exceeding time in the arc extinguishing chamber exceeds t1, the pressure switch is judged to be abnormal or the arc extinguishing chamber is judged to be abnormal, and the man-machine interaction module (51) displays that the arc extinguishing device is checked.
6. The method for protecting the high-voltage circuit breaker based on the non-electric quantity information as claimed in claim 4, wherein in the third step, only when the temperature overrun time exceeds t3 and the circuit breaker load current overrun time exceeds t4, the high-voltage circuit breaker is judged to be overloaded, and the man-machine interaction module (51) displays the inspection of the arc extinguishing device.
7. The method for protecting the high-voltage circuit breaker based on the non-electric quantity information as claimed in claim 4, wherein in the third step, only when the gas pressure exceeding time in the arc extinguishing chamber exceeds t1 and the arc signal duration exceeds t2, the arc extinguishing capability of the circuit breaker is judged to be weakened, the contact is worn, and the man-machine interaction module (51) displays that the arc extinguishing device is checked.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111289285.1A CN114220699A (en) | 2021-11-02 | 2021-11-02 | High-voltage circuit breaker protection device and method based on non-electric quantity information |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111289285.1A CN114220699A (en) | 2021-11-02 | 2021-11-02 | High-voltage circuit breaker protection device and method based on non-electric quantity information |
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| CN114220699A true CN114220699A (en) | 2022-03-22 |
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| CN202111289285.1A Pending CN114220699A (en) | 2021-11-02 | 2021-11-02 | High-voltage circuit breaker protection device and method based on non-electric quantity information |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205944774U (en) * | 2016-08-16 | 2017-02-08 | 成都万博智能电力科技股份有限公司 | Cubical switchboard temperature rise monitoring fuel detonation suppressant system |
| CN112072784A (en) * | 2020-07-29 | 2020-12-11 | 上海红檀智能科技有限公司 | Power distribution cabinet arc light monitoring and early warning device and monitoring and early warning method thereof |
-
2021
- 2021-11-02 CN CN202111289285.1A patent/CN114220699A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205944774U (en) * | 2016-08-16 | 2017-02-08 | 成都万博智能电力科技股份有限公司 | Cubical switchboard temperature rise monitoring fuel detonation suppressant system |
| CN112072784A (en) * | 2020-07-29 | 2020-12-11 | 上海红檀智能科技有限公司 | Power distribution cabinet arc light monitoring and early warning device and monitoring and early warning method thereof |
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