CN113690095A - Outdoor high-voltage vacuum circuit breaker - Google Patents
Outdoor high-voltage vacuum circuit breaker Download PDFInfo
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- CN113690095A CN113690095A CN202111133163.3A CN202111133163A CN113690095A CN 113690095 A CN113690095 A CN 113690095A CN 202111133163 A CN202111133163 A CN 202111133163A CN 113690095 A CN113690095 A CN 113690095A
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- 238000001514 detection method Methods 0.000 claims abstract description 81
- 238000010891 electric arc Methods 0.000 claims abstract description 29
- 238000010438 heat treatment Methods 0.000 claims abstract description 3
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 12
- 229910052710 silicon Inorganic materials 0.000 description 12
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- 239000011521 glass Substances 0.000 description 3
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- 238000002679 ablation Methods 0.000 description 1
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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
- H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
- H01H33/66—Vacuum switches
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING 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
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/54—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere
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- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
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Abstract
An outdoor high-voltage vacuum circuit breaker comprises a voltage-stabilized power supply, a high-voltage vacuum circuit breaker body, a standby high-voltage vacuum circuit breaker and a prompting circuit, and further comprises a time circuit, a contact detection circuit, a temperature detection circuit, an arc discharge detection circuit and a time delay circuit; the arc discharge detection circuit and the temperature detection circuit are respectively provided with a photoresistor and a temperature switch in a matched manner, the photoresistor is arranged at the outer side end of an arc extinguish chamber of the high-voltage vacuum circuit breaker body, and the temperature switch is arranged at a heating part of the high-voltage vacuum circuit breaker body; the voltage-stabilizing power supply, the time circuit, the contact detection circuit, the prompt circuit, the temperature detection circuit, the arc discharge 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 also detect the temperature and whether the arcing phenomenon occurs in real time; when overtemperature, arc discharge and contact performance are deteriorated, related personnel can be prompted to maintain through short messages.
Description
Technical Field
The invention relates to the technical field of electrical equipment, in particular to an outdoor high-voltage vacuum circuit breaker.
Background
The outdoor high-voltage vacuum circuit breaker is electrical equipment with wide application, and mainly plays the roles of switching on and off a power supply and safely supplying power. After the vacuum circuit breaker is used for a long time, the resistivity of a power supply contact is increased at a certain probability due to various reasons (influence of ablation and the like), namely the conductivity is deteriorated; and arc discharge or over-temperature phenomenon can be generated due to the influence of problems of longer quality or service life and the like, and great potential safety hazard is caused to safe power supply. In summary, it is necessary to provide a vacuum circuit breaker capable of automatically detecting the performance of a contact, timely disconnecting a load when arcing or overtemperature occurs, and prompting a manager to maintain or replace the whole device in time.
Disclosure of Invention
In order to overcome the defects that the prior vacuum circuit breaker has no contact performance self-checking device due to the structural limitation and can not prompt managers to maintain or replace in time when arcing or overtemperature occurs, the invention provides a high-voltage vacuum circuit breaker body and a standby circuit breaker, which can detect the contact resistance of the high-voltage vacuum circuit breaker body in the non-power consumption peak time period at a certain interval under the combined action of related mechanisms and circuits during application, and can detect whether arcing and overtemperature are generated during the power supply of the high-voltage vacuum circuit breaker body in real time, when arcing and overtemperature phenomena occur, the safety power supply of the standby circuit breaker can be automatically switched, and related management personnel can be prompted to maintain or replace the circuit breaker by short messages at the first time, so that the outdoor high-voltage vacuum circuit breaker for the safety power supply is effectively ensured.
The technical scheme adopted by the invention for solving the technical problems is as follows:
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 and a prompting circuit, and is characterized by also 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 an arc extinguish chamber of the high-voltage vacuum circuit breaker body, and the temperature switch is arranged at a heating part of the high-voltage vacuum circuit breaker body; the voltage-stabilizing power supply, the time circuit, the contact detection circuit, the prompt circuit, the temperature detection circuit, the arc discharge detection circuit and the delay circuit are arranged in the electric cabinet; the power supply output end of the voltage-stabilized power supply is electrically connected with the power supply 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 prompt 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 of power output end and the second path of power output end of the time circuit are respectively 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; and 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.
Furthermore, the time circuit comprises a time control switch and relays which are electrically connected, and the power output end of the time control switch is respectively connected with the two power input ends of the two relays; .
Furthermore, the contact detection circuit has three same 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 of the first NPN triode and a base of the second NPN triode, one end of the adjustable resistor is connected with the base of the first NPN triode, and emitters of the two NPN triodes are connected.
Furthermore, the prompting circuit is a short message alarm module.
Furthermore, 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 the temperature switch, one end of the temperature switch is connected with the anode of the silicon controlled rectifier and the input end of the relay control power supply, the other end of the temperature switch is connected with one end of the resistor, the other end of the resistor is connected with the control electrode of the silicon controlled rectifier, the cathode of the silicon controlled rectifier is connected with the input end of the anode power supply of the relay and the base electrode of the NPN triode, and the input end of the cathode power supply of the relay is connected with the emitting electrode of the NPN triode.
Further, the arc discharge detection circuit comprises an adjustable resistor, an NPN triode and a PNP triode which are electrically connected, and the adjustable resistor, the NPN triode and the PNP triode are electrically connected with each other, one end of the photosensitive resistor is connected with an emitting electrode of the PNP triode, the other end of the photosensitive resistor is connected with one end of the adjustable resistor, the other end of the adjustable resistor is connected with a base electrode of the NPN triode, and a collector electrode of the NPN triode is connected with the base electrode of the PNP triode.
Furthermore, the time 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 emitting electrode 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 electrode of the NPN triode, the collector electrode 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.
The invention has the beneficial effects that: in application, a time circuit can be connected with a contact detection circuit at intervals to detect the contact performance of the high-voltage vacuum circuit breaker body, and the standby high-voltage vacuum circuit breaker is automatically connected to temporarily supply power to an 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 determine whether the arc discharge phenomenon is generated in power supply. When the high-voltage vacuum circuit breaker body is over-temperature and arcing occurs between the incoming line contact and the outgoing line contact (the standby high-voltage vacuum circuit breaker is switched on to supply power for the power load temporarily), when the performance of the power input and output contacts is deteriorated, the prompting circuit can prompt relevant managers to maintain or replace in a short message mode at the first time, so that safe power supply is effectively guaranteed, and great convenience is brought to the management of the managers. Based on the above, the invention has good application prospect.
Drawings
The invention is further illustrated below with reference to the figures and examples.
Fig. 1 is a schematic view of the overall structure of the present invention.
Fig. 2 is a circuit diagram of the present invention.
Detailed Description
As shown in fig. 1 and 2, an outdoor high-voltage vacuum circuit breaker includes a regulated power supply a1, a high-voltage vacuum circuit breaker body M, a standby high-voltage vacuum circuit breaker M1, a prompt 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; the arc discharge detection circuit 4 and the temperature detection circuit 5 are respectively provided with a photoresistor RL and a temperature switch W in a matching way, the photoresistor RL is bonded at the outer end of a glass vacuum arc extinguish chamber 6 of the high-voltage vacuum circuit breaker body by transparent adhesive, the light receiving surface of the photoresistor RL faces to the inner end of the arc extinguish chamber, the temperature switch W is arranged at the outer 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 tightly attached to the outer end of the static contact; the voltage-stabilized 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.
As shown in FIGS. 1 and 2, the regulated power supply A1 is a finished product of an AC-to-DC switching power supply module with the model number of 220V/12V/100W. The time circuit comprises a time control switch A2 and relays K1 and K3 which are connected through circuit board wiring, wherein pins 3 and 4 of a power output end of the time control switch A2 are respectively connected with two ends of power input ends of the two relays K1 and K3; the time control switch A2 is a finished product of a full-automatic microcomputer time control switch with model KG316T, the microcomputer time control switch is provided with a display screen, seven keys of canceling/restoring, time correcting, week correcting, automatic/manual, timing and clock, and is provided with two power input ends 1, 2 pins and two power output ends 3, 4 pins, a user respectively presses and operates the seven keys, the interval time of the two power output ends for outputting power and the time of outputting power each time can be set, and the power failure can not cause the change of the set power output time as long as the next key operation setting is not carried out after one time setting. The contact detection circuit comprises three circuits, wherein each circuit comprises an adjustable resistor RP (RP1 or RP2), 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 a collector of the first NPN triode Q (Q3 or Q5) and a base of the second NPN triode Q2(Q4 or Q6), one end of the adjustable resistor RP (RP1 or RP2) is connected with a base of the first NPN triode Q (Q3 or Q5), and emitters of the two NPN triodes Q and Q2(Q3 or Q4) and Q2(Q5 or Q6). The prompting circuit is a short message alarming module A3 with a model number of GSM 800, a finished short message alarming module A3 is provided with two power input ends 1 and 2, and signal input ports 3-8, after each signal input port inputs a low level signal, the finished short message alarming module can send a short message through a wireless mobile network, the short message alarming module stores a short message (a direction prompting short message is edited in the embodiment, such as 'breaker failure', and a manager can know the specific direction of electricity stealing according to the position of a short message telephone), and the short message alarming module can send a short message after the signal input port of the short message alarming module inputs the low level signal.
As shown in fig. 1 and 2, the temperature detection circuit includes a thyristor VS, a resistor R7, a relay K4, and an NPN transistor Q8 connected to a circuit board through wires, and is connected to a temperature switch W through a wire, one end of the temperature switch W is connected to a positive terminal of the thyristor VS and a control power input terminal of the relay K4, the other end of the temperature switch W is connected to one end of the resistor R7, the other end of the resistor R7 is connected to a control terminal of the thyristor VS, a negative terminal of the thyristor VS is connected to a positive power input terminal of the relay K4 and a base of the NPN transistor Q8, and a negative power input terminal of the relay K4 is connected to an emitter of the NPN transistor Q8. The arc detection circuit comprises an adjustable resistor RP3, an NPN triode Q10 and a PNP triode Q11 which are connected through circuit board wiring, and the adjustable resistor RP3, the NPN triode Q10 and the PNP triode Q11 are connected with a photosensitive resistor RL through a conducting wire, one end of the photosensitive resistor RL is connected with an emitting electrode of the PNP triode Q11, the other end of the photosensitive resistor RL is connected with one end of an 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 electrode of the NPN triode Q10 is connected with a base electrode of the PNP triode Q11. The time delay circuit comprises resistors R1 and R2, a capacitor C1, an NPN triode Q1, a relay K, K2 and a relay K5 which are connected through circuit board wiring; one end of a first resistor R1 is connected with the positive power input end of a first relay K2, the positive power input end of a second relay K, the positive power input end of a third relay K5 and three control power input ends of a first relay K2, the negative power input end of the second relay K is connected with the negative electrode of a capacitor C1 and the emitting electrode of an NPN triode Q1, the other end of a first resistor R1 is connected with the negative electrode of the capacitor C1 and one end of a second resistor R2, the other end of the second resistor R2 is connected with the base electrode of the NPN triode Q1, the collector electrode of the NPN triode Q1 is connected with the negative power input ends of the first relay K2 and the third relay K5, and the three control power input ends of the second relay K are respectively connected with the three control power input ends of the third relay K5.
As shown in fig. 1 and 2, pins 1 and 2 of a power input end of a regulated power supply a1 and two poles of a 220V alternating-current power supply are respectively connected through leads, pins 3 and 4 of a power output end of a regulated power supply a1 and pins 1 and 2 of a time control switch a2 and a power input end of a time circuit are respectively connected through leads, pins 1 and 2 of a short message module A3 of the power input end of a prompt circuit, an anode of a thyristor VS and an emitter of an NPN triode Q8 of the power input end of a temperature detection circuit, one end of a photoresistor RL and an emitter of an NPN triode Q10 of the power input end of a drawn arc detection circuit, the other end of a resistor R3(R4 or R5) of the power input end of a three-way contact detection circuit and the emitter of an NPN triode Q (Q3 or Q5) are respectively connected through leads. The power output end of the delay circuit is connected with three normally open contact ends of a relay K5, the negative electrode of a capacitor C1 and the other end of an adjustable resistor RP and the emitter of an NPN triode Q, the other end of an adjustable resistor RP2 and the emitter of an NPN triode Q3, the other end of an adjustable resistor RP3 and the emitter of an NPN triode Q5 through leads. One end of a power input end resistor R1 of the delay circuit, the negative electrode of a capacitor C1 and the 3 and 4 pins of the time control switch A2 of the power output end of the time circuit are respectively connected through leads. The signal output ends of the contact detection circuit are NPN triodes Q2, Q4 and Q6, the collector of the signal output end NPN triode Q8 of the temperature detection circuit is connected with the 3 pin of the signal input end of the prompt circuit A3 through a lead, and the collector of the signal output end PNP triode Q11 of the arc detection circuit is connected with one end of the signal input end resistor R7 of the temperature detection circuit through a lead. Three control power input ends of signal input end relays K3 and K1 of the time circuit are respectively connected with a three-phase 380V alternating current power supply through leads, and three normally closed contact ends of a first path of power output end relay K1 and three normally open contact ends of a second path of power output end relay K3 of the time circuit are respectively connected with three power input ends of a high-voltage vacuum circuit breaker body M and a standby high-voltage vacuum circuit breaker M1 through leads. High-pressure vacuum circuit breaker body M, reserve high-pressure vacuum circuit breaker M1's power output end is connected through the wire with electrical load FH respectively, high-pressure vacuum circuit breaker body M's three power input contact end, three power output contact end and delay circuit's two way trigger signal input relay K2 three normally open contact end, the three normally open contact end of relay K5, the three control power input end of relay K is connected through the wire respectively, the three normally closed contact end of relay K and the three power input end of electrical load FH are connected through the wire respectively. The normally open contact end of a trigger power supply output end relay K4 and the negative power supply input end of a relay K4 of the temperature detection circuit are respectively connected with the positive power supply input end and the negative power supply input end of control signal ends relays K1 and K3 of the time circuit, the positive power supply input end of a control signal end relay K2 of the time delay circuit and the emitter of an NPN triode Q1 of the time delay circuit through leads.
As shown in fig. 1 and 2, after the 220V ac power supply enters the power input terminals 1 and 2 of the regulated power supply a1, the power output terminals 3 and 4 of the regulated power supply a1 will output stable 12V dc power supply to enter the power input terminals of the time circuit, the prompting circuit, the temperature detection circuit, the arc detection circuit and the contact detection circuit, so that the circuits are in an energized operating state. After the time circuit is powered on, the time control switch A2 outputs a power supply with a certain time interval under the action of the internal circuit and the power supply output time of 3 and 4 pins set by a technician, the power supply with a certain time interval enters the power supply input end of the time delay circuit (for example, the power supply is output for 20 seconds every 5 days at 2 pm in an off-peak time period), and enters the power supply input ends of the relays K1, K3 and K, so that the relay K1 is powered on to attract the three control power supply input ends and three normally closed contact ends thereof to be opened, the relay K3 is powered on to attract the three control power supply input ends and three normally open contact ends thereof to be closed, and the relay K is powered on to attract the three control power supply input ends and three normally closed contact ends thereof to be opened; 380V alternating current power supply no longer gets into power consumption load FH end through high-pressure vacuum circuit breaker body M, and 380V alternating current power supply can get into power consumption load FH end through reserve high-pressure vacuum circuit breaker M1, and like this, 380V alternating current power supply can continue to be the power consumption load end FH power supply, and high-pressure vacuum circuit breaker body M no longer is the power consumption load power supply, for the follow-up quality that detects high-pressure vacuum circuit breaker body M prepares. In the time that the time circuit does not export power, 380V alternating current power supply gets into high-pressure vacuum circuit breaker body M power input end through three control power input end of relay K1 and three normally closed contact end, get into the three control power input end of relay K through high-pressure vacuum circuit breaker body M power output end again, then get into with electric load end FH through the three normally closed contact end of relay K, high-pressure vacuum circuit breaker body M normally supplies power for with electric load FH at ordinary times (after relay K3 loses the electricity, reserve high-pressure vacuum circuit breaker M1 also no longer supplies power for with electric load FH).
As shown in fig. 1 and 2, after the delay circuit is powered on to work, the 12V power supply is subjected to voltage reduction and current limitation by the resistor R1 to charge the capacitor C1, and when the capacitor C1 is not fully charged in a beginning period of time, the positive electrode of the 12V power supply enters the base of the NPN triode Q1 to be lower than 0.7V after being subjected to voltage reduction and current limitation by the resistors R1 and R2, and the NPN triode Q1 cut-off relays K2 and K5 are not powered on and attracted; after a period of time (for example, 5 seconds), when the capacitor C1 is fully charged, the 12V power supply positive electrode is subjected to voltage reduction and current limitation by the resistors R1 and R2, then enters the NPN triode Q1 base electrode higher than 0.7V, the NPN triode Q1 conducts the collector electrode and outputs a low level to the power supply input ends of the relays K2 and K5, the control power supply input end and the normally open contact end of the relay K2 are closed after the relay K2 is electrified and attracted, and the control power supply input end and the normally open contact end of the relay K5 are electrified and attracted, so that the 12V power supply positive electrode respectively enters the three power supply input contacts of the high-voltage vacuum circuit breaker body M through the control power supply input end and the three normally open contact ends of the relay K2, then enters the three control power supply input ends of the relay K5 through the three power supply output contacts of the high-voltage vacuum circuit breaker body M, and then enters the positive signal power supply input end (adjustable resistor RP1, RP1 or RP 5) of the three normally open contact ends of the relay K5 The other end of the RP2), the three-way contact detection circuit is in an electrically-powered working state. After the three-way contact detection circuit works in an electrified mode, if a first contact (or a second contact and a third contact) in a high-voltage vacuum circuit breaker body M is good in conducting performance and relatively small in resistance value, a 12V power supply positive electrode enters a base electrode of an NPN triode Q (or Q3 and Q5) after being subjected to voltage reduction and current limitation through an adjustable resistor RP (or RP1 and RP2), the base electrode of the NPN triode Q (or Q3 and Q5) is higher than 0.7V, the NPN triode Q (or Q3 and Q5) conducts a collector electrode to output a low level and enters a base electrode of an NPN triode Q2 (or Q4 and Q6), the base electrode of the NPN triode Q2 (or Q4 and Q6) is not properly biased in a cut-off state, a low-level signal (no short message is sent) cannot be input to a pin 3 of a short message module A3, and if the first contact (or the second contact and the third contact) in the high-voltage vacuum circuit breaker body M is poor in resistance value and the resistance value is relatively large, the 12V power supply positive electrode is subjected to current reduction through an adjustable resistor RP1, RP2) to reduce voltage and limit current, then the current enters an NPN triode Q (or Q3, Q5) base electrode lower than 0.7V, the NN triode Q (or Q3, Q6) stops collector electrode and no longer outputs low level to enter an NPN triode Q2 (or Q4, Q6) base electrode, the NPN triode Q2 (or Q4, Q6) base electrode reduces voltage and limits current via a resistor R3 to obtain proper forward bias conduction from the 12V power supply positive electrode, then the NPN triode Q2 (or Q4, Q6) collector electrode outputs low level to enter a short message module A3 pin 3, and after a low level signal is input to pin 3 of the short message module A3, a pre-stored short message is sent out under the action of its internal circuit.
As shown in fig. 1 and 2, after the temperature detection circuit is powered on and works, 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 open, so that the silicon controlled rectifier VS is not conducted, and the short message module a3 does not emit a short message; if its temperature of high-pressure vacuum circuit breaker body M abnormal work is high, the inside contact closure of temperature switch W, 12V power positive pole can be through resistance R7 step-down current-limiting trigger silicon controlled rectifier VS switches on like this, and then relay K4 gets electric actuation its control power input and normally open contact end closure, delay circuit's relay K and time control circuit's relay K1, K3 power input can get electric, high-pressure vacuum circuit breaker body M no longer is the power supply of power consumption load FH, reserve high-pressure vacuum circuit breaker M1 is the power supply of power consumption load FH. After the silicon controlled rectifier VS is conducted, the NPN triode Q8 can conduct a collector to output low level to enter a pin 3 of the short message module A3, and after a low level signal is input into the pin 3 of the short message module A3, a pre-stored short message can be sent out under the action of an internal circuit thereof. In the arc discharge detection circuit, when the glass vacuum arc extinguish chamber 6 (the outer end is wrapped by an insulating material, external light cannot irradiate on the light receiving surface of the photoresistor RL) of the high-voltage vacuum circuit breaker body M is not arc discharge in power supply, the light receiving surface of the photoresistor RL has no illumination resistance which is large (about 10M), so that the positive pole of a 12V power supply enters an NPN triode Q10 base electrode to be lower than 0.7V after being subjected to voltage reduction and current limitation by the photoresistor RL and an adjustable resistor RP3, the NPN triode Q10 and the PNP triode Q11 are cut off, and the relay K4 cannot be powered 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-sensitive resistor RL has a small illuminating resistance (about 100K) on the light-sensitive resistor RL, so that the 12V power supply positive electrode enters an NPN triode Q10 base electrode to be higher than 0.7V through voltage reduction and current limitation of the light-sensitive resistor RL and an adjustable resistor RP3, further, the NPN triode Q10 and the PNP triode Q11 are sequentially conducted, the high level output by the PNP triode Q11 collector electrode is triggered to be conducted through voltage reduction and current limitation of a resistor R7 to trigger a silicon controlled rectifier VS, further, a relay K4 is electrified to attract the power supply input end and a normally open contact end to be closed, the relay K of the delay circuit and the relays K1 and K3 of the time control circuit are electrified, the high-voltage vacuum circuit breaker body M no longer supplies power for an electric load FH, and a standby high-voltage vacuum circuit breaker M1 supplies power for the electric load FH. After the silicon controlled rectifier VS is conducted, the NPN triode Q8 can conduct a collector to output low level to enter a pin 3 of the short message module A3, and after a low level signal is input into the pin 3 of the short message module A3, a pre-stored short message can be sent out under the action of an internal circuit thereof. Through the action of all the circuits, the time circuit can enable the contact detection circuit to be electrified at certain intervals for working, 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 load FH, so that the normal power consumption of the power 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 over-temperature or arc discharge, can automatically detect the contact performance of the high-voltage vacuum circuit breaker body M when the over-temperature and the arc discharge occur, and can switch the standby high-voltage vacuum circuit breaker M1 to supply power for the power load FH so as to ensure the normal power consumption of the power load FH; when the over-temperature, arc discharge and contact performance are deteriorated, the short message module A3 sends a short message, and after a mobile phone of a management party connected with the short message module A3 receives the short message, the mobile phone can timely know that the over-temperature, arc discharge or contact performance is deteriorated on the site, and can timely go to the site for maintenance or replacement. The time delay circuit mainly has the function of preventing a 380V power supply from entering one end of a resistor R1 and the like through a relay K2 control power supply input end and a normally open contact end at the moment when a time circuit output power supply enters the time delay circuit, so that the time delay circuit is damaged, 5 seconds of time delay, the 380V power supply does not enter the normally closed contact end through a relay K1 and enters the three normally open contact ends of a relay K2, and the time delay circuit cannot be damaged due to overvoltage.
In fig. 2, the models of the relays K, K1, K2, K3, K4 and K5 are DC 12V; the resistors R1, R2, R3, R4, R5 and R7 are respectively 450K, 470K, 47K and 1K; the VS model of the controllable silicon is MR 100-1; NPN triodes Q1, Q, Q2, Q3, Q4, Q5, Q6, Q8, Q10 and Q11 are respectively 9013, 9014, 9013 and 9013 in model number; the model of the PNP triode Q11 is 9012; the model of the capacitor C1 is 10 mu F/25V; the photoresistor RL model is MD 45; the adjustable resistors RP, RP1, RP2 and RP3 are 10M in model number; the temperature switch W is a 60 ℃ normally open contact temperature switch with the model of KSD 301; the controllable silicon VS is a unidirectional controllable silicon with the model MCR 100-1. Before production and sizing, the resistance values of RP, RP1, RP2 and RP3 need to be determined; when the method is determined, another high-voltage vacuum circuit breaker which is damaged and has a larger power supply contact resistance to influence safe power supply is selected as a test bench, then the resistance values of the adjustable resistors RP, RP1 and RP2 are repeatedly adjusted until the NPN triode Q2 or the Q4 and the Q6 are conducted, and then the resistance values of the adjustable resistors RP, RP1 and RP2 are adjusted to the required resistance values; then when the lamp shines on the light receiving surface of the photosensitive resistor RL, the resistance value of the adjustable resistor RP3 is repeatedly adjusted, and the resistance value of the adjustable resistor RP3 is adjusted to the required resistance value just after the PNP triode is switched on; and finally, the power supply is disconnected to test the resistance values of the adjustable resistors RP, RP1, RP2 and RP3 respectively, and then the resistance values of the adjustable resistors RP, RP1, RP2 and RP3 can be directly adjusted to the right before subsequent batch production (the resistors do not need to be determined again), or fixed resistors with the same resistance values are used for replacing the resistors. In the invention, in order to improve the driving capability, a composite triode can be adopted as the NPN triode Q1, and direct current electromagnetic contactors can be adopted as the relays K1, K3 and K.
While there have been shown and described what are at present considered the fundamental principles and essential features of the invention and its advantages, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, but is capable of 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 refers to embodiments, the embodiments do not include only a single technical solution, and such description is for clarity only, and those skilled in the art should integrate the description, and the technical solutions in the embodiments can be combined appropriately to form other embodiments understood by those skilled in the art.
Claims (7)
1. 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 and a prompting circuit, and is characterized by also 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 an arc extinguish chamber of the high-voltage vacuum circuit breaker body, and the temperature switch is arranged at a heating part of the high-voltage vacuum circuit breaker body; the voltage-stabilizing power supply, the time circuit, the contact detection circuit, the prompt circuit, the temperature detection circuit, the arc discharge detection circuit and the delay circuit are arranged in the electric cabinet; the power supply output end of the voltage-stabilized power supply is electrically connected with the power supply 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 prompt 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 of power output end and the second path of power output end of the time circuit are respectively 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; and 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.
2. An outdoor high-voltage vacuum circuit breaker according to claim 1, characterized in that the time circuit comprises a time switch and a relay which are electrically connected, and the power output end of the time switch and the two power input ends of the two relays are respectively connected; .
3. The outdoor high-voltage vacuum circuit breaker according to claim 1, characterized in that the contact detection circuit has three identical paths, each path includes an adjustable resistor, a resistor, and an NPN transistor electrically connected, one end of the resistor is connected to the collector of the first NPN transistor and the base of the second NPN transistor, one end of the adjustable resistor is connected to the base of the first NPN transistor, and the emitters of the two NPN transistors are connected.
4. An outdoor high-voltage vacuum circuit breaker according to claim 1, characterized in that the prompting circuit is a short message alarm module.
5. The outdoor high-voltage vacuum circuit breaker according to claim 1, characterized in that the temperature detection circuit comprises a thyristor, a resistor, a relay and an NPN triode which are electrically connected and electrically connected with the temperature switch, one end of the temperature switch is connected with the anode of the thyristor and the input end of the relay control power supply, the other end of the temperature switch is connected with one end of the resistor, the other end of the resistor is connected with the control electrode of the thyristor, the cathode of the thyristor is connected with the input end of the positive power supply of the relay and the base of the NPN triode, and the input end of the negative power supply of the relay is connected with the emitter of the NPN triode.
6. The outdoor high-voltage vacuum circuit breaker according to claim 1, characterized in that the arc detection circuit comprises an adjustable resistor, an NPN triode and a PNP triode which are electrically connected with each other, and is electrically connected with a photoresistor, one end of the photoresistor is connected with an emitting electrode 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 a base electrode of the NPN triode, and a collector electrode of the NPN triode is connected with a base electrode of the PNP triode.
7. An outdoor high-voltage vacuum circuit breaker according to claim 1, characterized in that the delay circuit comprises a resistor, a capacitor, an NPN transistor and a relay which are electrically connected, one end of the first resistor and the positive power input end of the first relay, the positive power input end of the second relay, 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 electrode of the NPN triode, the collector electrode of the NPN triode is connected with the power input ends of the first relay and the negative electrode 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.
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| CN113690095B (en) | 2024-04-12 |
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