CN113690095B - Outdoor high-voltage vacuum circuit breaker - Google Patents

Outdoor high-voltage vacuum circuit breaker Download PDF

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Publication number
CN113690095B
CN113690095B CN202111133163.3A CN202111133163A CN113690095B CN 113690095 B CN113690095 B CN 113690095B CN 202111133163 A CN202111133163 A CN 202111133163A CN 113690095 B CN113690095 B CN 113690095B
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circuit
detection circuit
relay
voltage vacuum
npn triode
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CN113690095A (en
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江凌晨
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Henan Wistar Electric Co ltd
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Henan Wistar Electric Co ltd
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/60Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
    • H01H33/66Vacuum switches
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01DMEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D21/00Measuring or testing not otherwise provided for
    • G01D21/02Measuring two or more variables by means not covered by a single other subclass
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/54Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
  • Protection Of Static Devices (AREA)

Abstract

An outdoor high-voltage vacuum circuit breaker comprises a stabilized voltage power supply, a high-voltage vacuum circuit breaker body, a standby high-voltage vacuum circuit breaker, a prompt circuit, a time circuit, a contact detection circuit, a temperature detection circuit, an arc discharge detection circuit and a delay circuit; the arc discharge detection circuit and the temperature detection circuit are respectively matched with a photoresistor and a temperature switch, the photoresistor is arranged at the outer side end of the arc extinguishing chamber of the high-voltage vacuum circuit breaker body, and the temperature switch is arranged at the heating part of the high-voltage vacuum circuit breaker body; the stabilized voltage power supply, the time circuit, the contact detection circuit, the prompting circuit, the temperature detection circuit, the arcing detection circuit and the delay circuit are arranged in the electric cabinet and are electrically connected with the high-voltage vacuum circuit breaker body and the standby high-voltage vacuum circuit breaker. The invention can detect the contact performance of the high-voltage vacuum circuit breaker body, and can detect the temperature and whether the arcing phenomenon occurs in real time; when the overtemperature, arcing and contact performance degradation occur, the short message can prompt related personnel for maintenance.

Description

Outdoor high-voltage vacuum circuit breaker
Technical Field
The invention relates to the technical field of electrical equipment, in particular to an outdoor high-voltage vacuum circuit breaker.
Background
An outdoor high-voltage vacuum circuit breaker is an electrical device with wider application, and mainly plays roles of switching a power supply and safely supplying power. After the vacuum circuit breaker is used for a long time, the probability of resistivity increase of the power contact due to various reasons (influence of ablation and the like), namely the conductivity is poor; and also can generate arcing or overtemperature phenomenon due to the influence of the problems of long quality or service life and the like, thereby causing great potential safety hazard to safe power supply. In summary, it is particularly necessary to provide a vacuum circuit breaker that can automatically detect the contact performance, timely disconnect the load when arcing or overtemperature occurs, and prompt the manager to timely maintain or replace the whole equipment.
Disclosure of Invention
In order to overcome the defects that the existing vacuum circuit breaker is limited by a structure, is not provided with a contact performance self-checking device, can not prompt management personnel to maintain or replace in time when arc discharge or overtemperature occurs, and causes potential safety hazards to power supply, the invention provides an outdoor high-voltage vacuum circuit breaker based on a high-voltage vacuum circuit breaker body and a standby circuit breaker.
The technical scheme adopted for solving the technical problems is as follows:
the outdoor high-voltage vacuum circuit breaker comprises a stabilized voltage power supply, a high-voltage vacuum circuit breaker body, a standby high-voltage vacuum circuit breaker and a prompting circuit, and is characterized by further comprising a time circuit, a contact detection circuit, a temperature detection circuit, an arc discharge detection circuit and a delay circuit; the arc discharge detection circuit and the temperature detection circuit are respectively matched with a photoresistor and a temperature switch, the photoresistor is arranged at the outer side end of the arc extinguish chamber of the high-voltage vacuum circuit breaker body, and the temperature switch is arranged at the heating part of the high-voltage vacuum circuit breaker body; the stabilized voltage power supply, the time circuit, the contact detection circuit, the prompting circuit, the temperature detection circuit, the arc discharge detection circuit and the delay circuit are arranged in the electric cabinet; the power output end of the stabilized power supply is electrically connected with the power input ends of the time circuit, the prompting circuit, the temperature detection circuit, the arc discharge detection circuit and the contact detection circuit; the power supply output end of the delay circuit is electrically connected with the signal power supply input end of the contact detection circuit, and the power supply input end of the delay circuit is electrically connected with the power supply output end of the time circuit; the signal output ends of the contact detection circuit and the temperature detection circuit are electrically connected with the signal input end of the prompting circuit, and the signal output end of the arc discharge detection circuit is electrically connected with the signal input end of the temperature detection circuit; the first path and the second path of power output ends of the time circuit are respectively and electrically connected with the power input ends of the high-voltage vacuum circuit breaker body and the standby high-voltage vacuum circuit breaker, and the power input contact end and the power output contact end of the high-voltage vacuum circuit breaker body are electrically connected with the two paths of trigger signal input ends of the delay circuit; the trigger power supply output end of the temperature detection circuit is electrically connected with the control signal end of the time circuit and the control signal end of the time delay circuit respectively.
Further, the time circuit comprises a time control switch and a relay which are electrically connected, wherein the power output end of the time control switch is respectively connected with the power input ends of the two relays; .
Further, the contact detection circuit has the same three paths, each path comprises an adjustable resistor, a resistor and an NPN triode which are electrically connected, one end of the resistor is connected with a collector electrode of the first NPN triode and a base electrode of the second NPN triode, one end of the adjustable resistor is connected with a base electrode of the first NPN triode, and two emitter electrodes of the NPN triode are connected.
Further, the prompting circuit is a short message alarming module.
Further, the temperature detection circuit comprises a silicon controlled rectifier, a resistor, a relay and an NPN triode which are electrically connected, and is electrically connected with a temperature switch, one end of the temperature switch is connected with a silicon controlled rectifier anode and a relay control power input end, the other end of the temperature switch is connected with one end of the resistor, the other end of the resistor is connected with a silicon controlled rectifier control electrode, a silicon controlled rectifier cathode is connected with a relay positive power input end and an NPN triode base electrode, and a relay negative power input end is connected with an NPN triode emitter.
Further, the arc discharge detection circuit comprises an adjustable resistor, an NPN triode and a PNP triode which are electrically connected, wherein one end of the photoresistor is connected with the emitter of the PNP triode, the other end of the photoresistor is connected with one end of the adjustable resistor, the other end of the adjustable resistor is connected with the base electrode of the NPN triode, and the collector of the NPN triode is connected with the base electrode of the PNP triode.
Further, the delay circuit comprises a resistor, a capacitor, an NPN triode and a relay which are electrically connected, wherein one end of the first resistor is connected with a positive power input end of the first relay, a positive power input end of the second relay, a positive power input end of the third relay and three control power input ends of the first relay, the negative power input end of the second relay is connected with a capacitor negative electrode and an emitter of the NPN triode, the other end of the first resistor is connected with the capacitor negative electrode and one end of the second resistor, the other end of the second resistor is connected with a base electrode of the NPN triode, a collector electrode of the NPN triode is connected with the first relay and the negative power input end of the third relay, and the three control power input ends of the second relay and the three control power input ends of the third relay are respectively connected.
The invention has the beneficial effects that: the invention is based on the high-voltage vacuum circuit breaker body and the standby circuit breaker, in application, the time circuit can be connected with the contact detection circuit for detecting the contact performance of the high-voltage vacuum circuit breaker body at intervals, and the standby high-voltage vacuum circuit breaker is automatically connected to temporarily supply power for the electric load; the temperature detection circuit and the arc discharge detection circuit can detect the temperature of the high-voltage vacuum circuit breaker body in real time and can detect whether an arc discharge phenomenon occurs in power supply. When the high-voltage vacuum circuit breaker body is overtemperature and arcing occurs between the incoming contact and the outgoing contact (the standby high-voltage vacuum circuit breaker is switched on to temporarily supply power for an electric load), and the performance of the power supply input and output contacts is poor, the prompting circuit can prompt related management personnel to maintain or replace by a short message at the first time, so that safe power supply is effectively ensured, and great convenience is brought to management of the management personnel. Based on the above, the invention has good application prospect.
Drawings
The invention will be further described with reference to the drawings and examples.
Fig. 1 is a schematic diagram of the overall structure of the present invention.
Fig. 2 is a circuit diagram of the present invention.
Detailed Description
The outdoor high-voltage vacuum circuit breaker comprises a stabilized voltage power supply A1, a high-voltage vacuum circuit breaker body M, a standby high-voltage vacuum circuit breaker M1, a prompting circuit A3, a time circuit 1, a contact detection circuit 2, a temperature detection circuit 3, an arc discharge detection circuit 4 and a delay circuit 5, wherein the time circuit 1 is a circuit board; the arc discharge detection circuit 4 and the temperature detection circuit 5 are respectively matched with a photoresistor RL and a temperature switch W, the photoresistor RL is adhered to the outer side end of a glass vacuum arc-extinguishing chamber 6 of the high-voltage vacuum circuit breaker body by transparent adhesive, the light receiving surface of the photoresistor RL faces the inner side end of the arc-extinguishing chamber, and the temperature switch W is arranged at the outer side end of a static contact of the high-voltage vacuum circuit breaker body M, and the temperature sensing surface of the temperature switch W is clung to the outer side end of the static contact; the stabilized voltage power supply A1, the time circuit 1, the contact detection circuit 2, the prompt circuit A3, the temperature detection circuit 3, the arc discharge detection circuit 4 and the delay circuit 5 are arranged on a circuit board in the electric cabinet 7.
The voltage-stabilized power supply A1 is a finished product of an alternating current-to-direct current switching power supply module with the model of 220V/12V/100W as shown in figures 1 and 2. The time circuit comprises a time control switch A2 and relays K1 and K3 which are connected through wiring of a circuit board, wherein the power output ends 3 and 4 pins of the time control switch A2 are respectively connected with the two ends of the power input ends of the two relays K1 and K3; the time control switch A2 is a full-automatic microcomputer time control switch finished product of a model KG316T, the microcomputer time control switch is provided with a display screen, seven keys of cancel/restore, timing, correction, week correction, automatic/manual, timing and clock are provided, the time control switch is provided with two power input ends 1 and 2 feet, two power output ends 3 and 4 feet, a user can respectively press and operate seven keys, the interval time of the power output ends for outputting power and the time of outputting power each time can be set, and the power loss can not cause the set power output time change as long as the next operation key setting is not performed after one setting. The contact detection circuit has the same three paths, each path comprises an adjustable resistor RP (RP 1 or RP 2), a resistor R3 (R4 or R5), NPN triodes Q and Q2 (Q3 or Q4) and Q2 (Q4 or Q6) which are connected through circuit board wiring, one end of the resistor R3 (R4 or R5) is connected with the collector of the first NPN triode Q (Q3 or Q5), the base of the second NPN triode Q2 (Q4 or Q6), one end of the adjustable resistor RP (RP 1 or RP 2) is connected with the base of the first NPN triode Q (Q3 or Q5), and the emitters of the two NPN triodes Q and Q2 (Q3 or Q4) and Q2 (Q5 or Q6) are connected. The prompting circuit is a short message alarming module A3 of the model GSM 800, the finished product A3 of the short message alarming module is provided with two power input ends 1 and 2 pins, signal input ports 3 to 8 pins, after each signal input port inputs a low-level signal, the finished product of the short message alarming module can send a short message through a wireless mobile network, the short message alarming module stores the short message (the embodiment edits an azimuth prompting short message, such as a 'breaker fault', a manager can know the specific azimuth of the power stealing according to the position of a short message telephone), and after the signal input port of the short message alarming module is input with the low-level signal, the short message alarming module can send a short message.
As shown in fig. 1 and 2, the temperature detection circuit comprises a silicon controlled rectifier VS, a resistor R7, a relay K4 and an NPN triode Q8 which are connected through wiring of a circuit board, and is connected with a temperature switch W through a wire, one end of the temperature switch W is connected with a silicon controlled rectifier VS anode and a control power input end of the relay K4, the other end of the temperature switch W is connected with one end of the resistor R7, the other end of the resistor R7 is connected with a silicon controlled rectifier VS control electrode, a silicon controlled rectifier VS cathode is connected with an anode power input end of the relay K4, a base electrode of the NPN triode Q8, and a cathode power input end of the relay K4 is connected with an emitter electrode of the NPN triode Q8. The arc discharge detection circuit comprises an adjustable resistor RP3, an NPN triode Q10 and a PNP triode Q11 which are connected through circuit board wiring, and is connected with a photoresistor RL through wires, one end of the photoresistor RL is connected with an emitter of the PNP triode Q11, the other end of the photoresistor RL is connected with one end of the adjustable resistor RP3, the other end of the adjustable resistor RP3 is connected with a base electrode of the NPN triode Q10, and a collector of the NPN triode Q10 is connected with a base electrode of the PNP triode Q11. The delay circuit comprises resistors R1 and R2, a capacitor C1, an NPN triode Q1, relays K, K and K5 which are connected through circuit board wiring; one end of a first resistor R1 is connected with a positive power input end of a first relay K2, a positive power input end of a second relay K, a positive power input end of a third relay K5 and three control power input ends of the first relay K2, a negative power input end of the second relay K is connected with a negative electrode of a capacitor C1 and an emitter of an NPN triode Q1, the other end of the first resistor R1 is connected with a negative electrode of the capacitor C1 and one end of the second resistor R2, the other end of the second resistor R2 is connected with a base of the NPN triode Q1, a collector of the NPN triode Q1 is connected with a negative power input end of the first relay K2 and a negative power input end of the third relay K5, and three control power input ends of the second relay K are respectively connected with three control power input ends of the third relay K5.
As shown in fig. 1 and 2, the power input terminals 1 and 2 of the regulated power supply A1 and the two poles of the 220V ac power supply are respectively connected by wires, the power output terminals 3 and 4 of the regulated power supply A1 and the power input terminals of the time circuit are respectively connected by wires, the 1 and 2 of the time switch A2, the 1 and 2 of the power input terminal short message module A3 of the prompting circuit, the anode of the silicon controlled rectifier VS and the emitter of the NPN triode Q8 of the power input terminal of the temperature detection circuit, one end of the photosensitive resistor RL of the arcing detection circuit and the emitter of the NPN triode Q10, and the other end of the power input terminal resistor R3 (R4 or R5) of the three-way contact detection circuit and the emitter of the NPN triode Q (Q3 or Q5) are respectively connected by wires. The three normally open contact ends of the relay K5 at the power output end of the delay circuit, the negative electrode of the capacitor C1 and the signal power input end of the three-way contact detection circuit are respectively connected with the other end of the adjustable resistor RP and the emitter of the NPN triode Q, the other end of the adjustable resistor RP2 and the emitter of the NPN triode Q3, and the other end of the adjustable resistor RP3 and the emitter of the NPN triode Q5 through wires. One end of a power input end resistor R1 of the delay circuit, the negative electrode of a capacitor C1 and pins 3 and 4 of a time control switch A2 at the power output end of the time circuit are respectively connected through wires. The collector of NPN triode Q2, Q4 and Q6 at the signal output end of the contact detection circuit, the collector of NPN triode Q8 at the signal output end of the temperature detection circuit and the 3 pin at the signal input end of the prompt circuit A3 are connected by a wire, and the collector of PNP triode Q11 at the signal output end of the arc discharge detection circuit and the resistor R7 at the signal input end of the temperature detection circuit are connected by a wire. The three control power input ends of the relays K3 and K1 of the signal input end of the time circuit and the three-phase 380V alternating current power supply are respectively connected through wires, and the three normally closed contact ends of the relay K1 of the first power output end and the relay K3 of the second power output end of the time circuit are respectively connected with the three power input ends of the high-voltage vacuum circuit breaker body M and the three power input ends of the standby high-voltage vacuum circuit breaker M1 through wires. The power output ends of the high-voltage vacuum circuit breaker body M and the standby high-voltage vacuum circuit breaker M1 are respectively connected with an electric load FH through wires, three power input contact ends, three power output contact ends of the high-voltage vacuum circuit breaker body M and two paths of trigger signal input ends of a delay circuit are respectively connected with three normally open contact ends of a relay K2, three normally open contact ends of a relay K5 and three control power input ends of the relay K through wires, and three normally closed contact ends of the relay K and three power input ends of the electric load FH are respectively connected through wires. The trigger power output end relay K4 normally open contact end of the temperature detection circuit, the negative power input end of the relay K4, the positive power input end and the negative power input end of the relays K1 and K3 of the control signal end of the time circuit, the positive power input end of the relay K2 of the control signal end of the delay circuit and the emitter of the NPN triode Q1 are respectively connected through wires.
As shown in fig. 1 and 2, after the 220V ac power enters the pins 1 and 2 of the power input end of the regulated power supply A1, the pins 3 and 4 of the power output end of the regulated power supply A1 output the stable 12V dc power to the power input ends of the time circuit, the prompting circuit, the temperature detection circuit, the arc discharge detection circuit and the contact detection circuit, so that the circuits are in the power-on operation state. After the time circuit is powered on, under the action of the internal circuit and 3 and 4 pin output power supply time set by a technician, the time control switch A2 outputs a power supply for a certain time to enter a power supply input end of the delay circuit (for example, every 5 days, A2-point night non-power peak time period is output for 20 seconds Zhong Dianyuan), and enters power supply input ends of the relays K1, K3 and K, so that the relay K1 is powered on to attract three control power supply input ends and three normally closed contact ends of the relay K1, the relay K3 is powered on to attract three control power supply input ends and three normally open contact ends of the relay K, and the relay K is powered on to attract three control power supply input ends and three normally closed contact ends of the relay K; the 380V alternating current power supply does not enter the electricity utilization load FH end through the high-voltage vacuum circuit breaker body M any more, the 380V alternating current power supply can enter the electricity utilization load FH end through the standby high-voltage vacuum circuit breaker M1, and therefore the 380V alternating current power supply can continue to supply power for the electricity utilization load end FH, the high-voltage vacuum circuit breaker body M does not supply power for the electricity utilization load any more, and preparation is made for the quality of the follow-up high-voltage vacuum circuit breaker body M. In the time that the time circuit does not output the power, 380V alternating current power enters the high-voltage vacuum circuit breaker body M power input end through three control power input ends and three normally closed contact ends of the relay K1, enters three control power input ends of the relay K through the high-voltage vacuum circuit breaker body M power output end, then enters the power utilization load end FH through three normally closed contact ends of the relay K, and the normal power supply of the power utilization load FH for the high-voltage vacuum circuit breaker body M at ordinary times is guaranteed (after the relay K3 loses power, the standby high-voltage vacuum circuit breaker M1 does not power for the power utilization load FH any more).
In fig. 1 and 2, after the delay circuit is powered on, the 12V power supply is reduced in voltage and limited in current through the resistor R1 to charge the capacitor C1, and when the capacitor C1 is not fully charged in a period of time from the beginning, the positive pole of the 12V power supply is reduced in voltage and limited in current through the resistors R1 and R2 and then enters the base electrode of the NPN triode Q1 to be lower than 0.7V, and the cut-off relays K2 and K5 of the NPN triode Q1 are not powered on and powered off; after a period of time (such as 5 seconds), when the capacitor C1 is fully charged, the 12V power supply anode is reduced in voltage and limited in current through the resistors R1 and R2 and then enters the base electrode of the NPN triode Q1 to be higher than 0.7V, the conduction collector output of the NPN triode Q1 is low in level and enters the power input ends of the relays K2 and K5, the control power input end and the normally open contact end of the relay K2 are closed after the relay K2 is electrified and sucked, the control power input end and the normally open contact end of the relay K5 are closed, so that the 12V power supply anode enters the three power input contacts of the high-voltage vacuum circuit breaker body M through the control power input end and the three normally open contact ends of the relay K2 respectively, then enters the three control power input ends of the relay K5 through the three power output contacts of the high-voltage vacuum circuit breaker body M, and then enters the positive signal power input ends (the other ends of the adjustable resistors RP1 and RP 2) of the three-way contact detection circuit from the three-way contact ends of the relay K5, and the three-way contact detection circuit is in an electrical working state. After the three-way contact detection circuit works, if the first contact (or the second contact and the third contact) in the high-voltage vacuum circuit breaker body M is good in conductivity and relatively small in resistance value, the positive electrode of the 12V power supply is reduced in voltage and limited in current through the adjustable resistor RP (or RP1 and RP 2) and then enters the base electrode of the NPN triode Q (or Q3 and Q5) to be higher than 0.7V, the conducting collector of the NPN triode Q (or Q3 and Q5) is output to enter the base electrode of the NPN triode Q2 (or Q4 and Q6), the base electrode of the NPN triode Q2 (or Q4 and Q6) is not properly forward biased to be in a cut-off state, the 3 pin of the short message module A3 is not input with a low-level signal (not to send a short message, and if the conductivity of the first contact (or the second contact and the third contact) in the high-voltage vacuum circuit breaker body M is poor and the resistance value is relatively large, the positive electrode of the 12V power supply is reduced in voltage and limited in current through the adjustable resistor RP (or RP1 and RP 2) and then enters the base electrode of the NPN triode Q2 (or Q4 and Q6) to be lower than 0.7V, the base electrode of the NPN triode Q (or Q3 and Q5) is output to be lower than the base electrode of the NPN triode Q2 (or Q4 and Q6), the base electrode of the NPN triode Q2 (or Q4 and Q6) is not input to be in a proper forward biased state, and then the base electrode of the short message module A3 is input to be in the low-level signal is not input to the base electrode (or the short message is not sent to the base electrode.
After the temperature detection circuit is powered on, as shown in fig. 1 and 2, if the high-voltage vacuum circuit breaker body M works normally and the temperature is not high, the internal contact of the temperature switch W is opened, so that the thyristor VS is not turned on, and the short message module A3 is not sent out; if the high-voltage vacuum circuit breaker body M works abnormally and the temperature is high, the internal contact of the temperature switch W is closed, so that the 12V power supply anode can be reduced by the resistor R7 to limit the current to trigger the silicon controlled rectifier VS to be conducted, the control power supply input end and the normally open contact end of the relay K4 are powered on, the relay K of the delay circuit and the power supply input ends of the relays K1 and K3 of the time control circuit can be powered on, the high-voltage vacuum circuit breaker body M does not supply power for the power utilization load FH any more, and the standby high-voltage vacuum circuit breaker M1 supplies power for the power utilization load FH. After the silicon controlled rectifier VS is conducted, the NPN triode Q8 conducts the collector to output low level and enter the 3 pin of the short message module A3, and after the 3 pin of the short message module A3 inputs low level signals, a pre-stored short message is sent out under the action of an internal circuit of the short message module A3. In the arc-striking detection circuit, when the glass vacuum arc-extinguishing chamber 6 (the outer side end of the glass vacuum arc-extinguishing chamber is wrapped with an insulating material, external light cannot be irradiated on the light-receiving surface of the photoresistor RL) of the high-voltage vacuum circuit breaker body M is not in arc-striking during power supply, the light-receiving surface of the photoresistor RL is not large in illumination resistance (about 10M), so that the positive electrode of a 12V power supply is subjected to voltage reduction and current limitation through the photoresistor RL and the adjustable resistor RP3 and then enters the base electrode of the NPN triode Q10 to be lower than 0.7V, the NPN triode Q10 and the PNP triode Q11 are cut off, and then the relay K4 cannot be electrified and attracted. When the glass vacuum arc-extinguishing chamber 6 of the high-voltage vacuum circuit breaker body M generates arc discharge in power supply, the light receiving surface of the photoresistor RL is provided with a small light resistance (about 100K), so that the positive electrode of a 12V power supply is reduced in voltage and limited in current through the photoresistor RL and the adjustable resistor RP3 and enters the base electrode of the NPN triode Q10 to be higher than 0.7V, the NPN triode Q10 and the PNP triode Q11 are sequentially conducted, the high level output by the collector electrode of the PNP triode Q11 is reduced in voltage and limited in current through the resistor R7 to trigger the conduction of the controllable silicon VS, the relay K4 is electrified to close the control power supply input end and the normally open contact end, the relay K of the delay circuit and the relay K1 and the power supply input ends of the K3 of the time control circuit are electrified, the high-voltage vacuum circuit breaker body M is not electrified by the electric load FH, and the standby high-voltage vacuum circuit breaker M1 is electrified by the electric load FH. After the silicon controlled rectifier VS is conducted, the NPN triode Q8 conducts the collector to output low level and enter the 3 pin of the short message module A3, and after the 3 pin of the short message module A3 inputs low level signals, a pre-stored short message is sent out under the action of an internal circuit of the short message module A3. Through the functions of all the circuits, the time circuit can enable the contact detection circuit to be powered on at intervals of a certain period of time, and the contact detection circuit can automatically detect the contact performance of the high-voltage vacuum circuit breaker body M and switch the standby high-voltage vacuum circuit breaker M1 to supply power for the power utilization load FH, so that the normal power utilization of the power utilization load FH is ensured; the temperature detection circuit 3 and the arc discharge detection circuit 4 can detect whether the high-voltage vacuum circuit breaker body M is overtemperature or is in arc discharge, can automatically detect the contact performance of the high-voltage vacuum circuit breaker body M when the overtemperature and the arc discharge occur, and can switch the standby high-voltage vacuum circuit breaker M1 to supply power for the power load FH and ensure the normal power utilization of the power load FH; when overtemperature, arcing and contact performance degradation occur, the short message module A3 can send a short message, and after receiving the short message, a manager mobile phone connected with the short message module A3 can timely know that the overtemperature, arcing or contact performance degradation occurs on site, and can timely perform maintenance or replacement on site. The delay circuit has the advantages that the delay circuit is damaged due to the fact that 380V power supply enters one end of the resistor R1 through the relay K2 control power supply input end and the normally open contact end at the moment after the output power supply of the time circuit enters the delay circuit, the 380V power supply does not enter the normally closed contact end of the relay K1 and enters the three normally open contact ends of the relay K2 at the moment after 5 seconds delay, and therefore the delay circuit cannot be damaged due to overvoltage.
In fig. 2, the types of relays K, K1, K2, K3, K4, K5 are DC12V; resistors R1, R2, R3, R4, R5, R7 are 450K, 470K, 47K, 1K, respectively; the model of the silicon controlled rectifier VS is MR100-1; the model numbers of NPN triodes Q1, Q, Q2, Q3, Q4, Q5, Q6, Q8, Q10 and Q11 are 9013, 9014, 9013 and 9013 respectively; the model of the PNP triode Q11 is 9012; the model of the capacitor C1 is 10 mu F/25V; the model of the photoresistor RL is MD45; the adjustable resistors RP, RP1, RP2 and RP3 are 10M; the temperature switch W is a 60 ℃ normally open contact temperature switch with the model of KSD 301; the thyristor VS is a unidirectional thyristor of model MCR 100-1. The resistance values of RP, RP1, RP2 and RP3 are required to be determined before production and shaping; when the power supply is determined, selecting another high-voltage vacuum circuit breaker which is damaged and has larger power contact resistance and affects safe power supply as a laboratory bench, then repeatedly adjusting the resistance values of the adjustable resistors RP, RP1 and RP2, and adjusting the resistance values of the adjustable resistors RP, RP1 and RP2 to the required resistance values just after the NPN triodes Q2 or Q4 and Q6 are conducted; then when the light-receiving surface of the photoresistor RL is irradiated by the lamp illumination light, the resistance value of the adjustable resistor RP3 is repeatedly regulated, and after the PNP triode is just regulated to be conducted, the resistance value of the adjustable resistor RP3 is regulated to a required resistance value; and finally, disconnecting the power supply to test the resistance values of the adjustable resistors RP, RP1, RP2 and RP3 respectively, and then, directly adjusting the resistance values of the adjustable resistors RP, RP1, RP2 and RP3 to be in place (without determining the resistors) before subsequent mass production, or replacing the resistors with fixed resistors with the same resistance value. In the invention, in order to improve the driving capability, the NPN triode Q1 can be a composite triode, and the relays K1, K3 and K can be DC electromagnetic contactors.
While the fundamental and principal features of the invention and advantages of the invention have been shown and described, it will be apparent to those skilled in the art that the invention is limited to the details of the foregoing exemplary embodiments, and that the invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present description describes embodiments in terms of embodiments, the description of embodiments does not include only a single embodiment, but the description is for clarity only, and those skilled in the art should consider the description as a whole, and embodiments may be suitably combined to form other embodiments that will be understood by those skilled in the art.

Claims (1)

1. The outdoor high-voltage vacuum circuit breaker comprises a stabilized voltage power supply, a high-voltage vacuum circuit breaker body, a standby high-voltage vacuum circuit breaker and a prompting circuit, and is characterized by further comprising a time circuit, a contact detection circuit, a temperature detection circuit, an arc discharge detection circuit and a delay circuit; the arc discharge detection circuit and the temperature detection circuit are respectively matched with a photoresistor and a temperature switch, the photoresistor is arranged at the outer side end of the arc extinguish chamber of the high-voltage vacuum circuit breaker body, and the temperature switch is arranged at the heating part of the high-voltage vacuum circuit breaker body; the stabilized voltage power supply, the time circuit, the contact detection circuit, the prompting circuit, the temperature detection circuit, the arc discharge detection circuit and the delay circuit are arranged in the electric cabinet; the power output end of the stabilized power supply is electrically connected with the power input ends of the time circuit, the prompting circuit, the temperature detection circuit, the arc discharge detection circuit and the contact detection circuit; the power supply output end of the delay circuit is electrically connected with the signal power supply input end of the contact detection circuit, and the power supply input end of the delay circuit is electrically connected with the power supply output end of the time circuit; the signal output ends of the contact detection circuit and the temperature detection circuit are electrically connected with the signal input end of the prompting circuit, and the signal output end of the arc discharge detection circuit is electrically connected with the signal input end of the temperature detection circuit; the first path and the second path of power output ends of the time circuit are respectively and electrically connected with the power input ends of the high-voltage vacuum circuit breaker body and the standby high-voltage vacuum circuit breaker, and the power input contact end and the power output contact end of the high-voltage vacuum circuit breaker body are electrically connected with the two paths of trigger signal input ends of the delay circuit; the trigger power supply output end of the temperature detection circuit is electrically connected with the control signal end of the time circuit and the control signal end of the delay circuit respectively; the time circuit comprises a time control switch and a relay which are electrically connected, and the power output end of the time control switch is respectively connected with the power input ends of the two relays; the contact detection circuit is provided with three identical paths, each path comprises an adjustable resistor, a resistor and an NPN triode which are electrically connected, one end of the resistor is connected with the collector electrode of the first NPN triode and the base electrode of the second NPN triode, one end of the adjustable resistor is connected with the base electrode of the first NPN triode, and the emitters of the two NPN triodes are connected; the prompting circuit is a short message alarming module; the temperature detection circuit comprises a silicon controlled rectifier, a resistor, a relay and an NPN triode which are electrically connected, and is electrically connected with a temperature switch, one end of the temperature switch is connected with a silicon controlled rectifier anode and a relay control power input end, the other end of the temperature switch is connected with one end of the resistor, the other end of the resistor is connected with a silicon controlled rectifier control electrode, a silicon controlled rectifier cathode is connected with a relay positive power input end and a NPN triode base electrode, and a relay negative power input end is connected with an NPN triode emitter; the arc discharge detection circuit comprises an adjustable resistor, an NPN triode and a PNP triode which are electrically connected, and is electrically connected with the photoresistor, one end of the photoresistor is connected with the emitter of the PNP triode, the other end of the photoresistor is connected with one end of the adjustable resistor, the other end of the adjustable resistor is connected with the base electrode of the NPN triode, and the collector of the NPN triode is connected with the base electrode of the PNP triode; the delay circuit comprises a resistor, a capacitor, an NPN triode and a relay which are electrically connected, wherein one end of the first resistor is connected with the positive power input end of the first relay, the positive power input end of the second relay, the positive power input end of the third relay and the three control power input ends of the first relay, the negative power input end of the second relay is connected with the negative electrode of the capacitor and the emitter of the NPN triode, the other end of the first resistor is connected with the negative electrode of the capacitor and one end of the second resistor, the other end of the second resistor is connected with the base of the NPN triode, the collector of the NPN triode is connected with the negative power input ends of the first relay and the third relay, and the three control power input ends of the second relay and the three control power input ends of the third relay are respectively connected.
CN202111133163.3A 2021-09-27 2021-09-27 Outdoor high-voltage vacuum circuit breaker Active CN113690095B (en)

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