CN217332751U - Alternating current circuit breaker level difference cooperation testing device - Google Patents
Alternating current circuit breaker level difference cooperation testing device Download PDFInfo
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- CN217332751U CN217332751U CN202221108809.2U CN202221108809U CN217332751U CN 217332751 U CN217332751 U CN 217332751U CN 202221108809 U CN202221108809 U CN 202221108809U CN 217332751 U CN217332751 U CN 217332751U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
- Y04S40/126—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wireless data transmission
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Abstract
The utility model relates to the technical field of alternating current system, the utility model provides an alternating current breaker level difference cooperation testing arrangement, including short circuit analog circuit, short circuit analog circuit includes resistance R27, opto-coupler U7, triode Q5 and relay K1, the first input of opto-coupler U7 passes through resistance R27 and connects the 5V power, the second input is connected with the main control unit, the first output passes through resistance R26 and connects the 5V power, the second output ground connection, the first output still connects the base of triode Q5, the collecting electrode of triode Q5 passes through resistance R25 ground connection, the projecting pole passes through the input of relay K1 and connects the VCC power, first bus is connected to first public end, second bus is connected to the second public end, the load is connected to the normally closed end, the first normally open end is connected the second normally open end, through above-mentioned technical scheme, it mismatches to have solved the last subordinate alternating current breaker protection action characteristic in the alternating current system among the prior art, causing the problem of an ac circuit breaker tripping in steps and thereby causing other bus line outage accidents.
Description
Technical Field
The utility model relates to an alternating current system technical field, it is specific, relate to alternating current circuit breaker level difference cooperation testing arrangement.
Background
The ac power system is an important component of the power system, and is a basis of modern automatic control and monitoring, in the power system, the ac power system provides ac control or power supply for relays, circuit breakers, protection and automatic control devices, communication systems, and the like, and is an important component of the power system automatic monitoring, and in the ac power circuit, fuses and ac circuit breakers are main protective electrical components for each branch of the ac system with overcurrent or short-circuit faults.
At present, an alternating current bus network of a transformer substation adopts a tree structure, and an alternating current breaker is used as a main protection element for an alternating current bus with overcurrent and short-circuit faults, so that the alternating current bus network plays a role in disconnecting and isolating a feeder line loop power supply network. The power utilization equipment from the station to the power utilization equipment in the station generally passes through three-stage and four-stage power distribution, the alternating current circuit breaker is mostly adopted as a protective electric appliance for each stage of power distribution, if the protection action characteristics of the upper and lower alternating current circuit breakers are not matched, the override trip of the upper-stage alternating current circuit breaker can be caused when the lower-stage power utilization equipment has a short-circuit fault, so that the power failure accidents of other bus lines are caused, even the total-station alternating current power failure is caused, and the accident range is enlarged.
SUMMERY OF THE UTILITY MODEL
The utility model provides a poor cooperation testing arrangement of alternating current circuit breaker level has solved among the prior art middle and upper level alternating current circuit breaker protection operating characteristic of alternating current system and has unmatched, arouses the tripping operation of alternating current circuit breaker override to arouse the problem of the outage accident of other bus lines.
The technical scheme of the utility model as follows:
alternating current breaker level difference cooperation testing arrangement for monitor alternating current system, alternating current system includes multistage alternating current bus, and is multistage connect through alternating current breaker between the alternating current bus, including alternating current outage monitoring circuit, short circuit analog circuit, main control unit, long-range management and control platform and wireless transceiver module, alternating current outage monitoring circuit and short circuit analog circuit all are connected with the main control unit, the main control unit pass through local area network with long-range management and control platform communication connection, long-range management and control platform connects wireless transceiver module to with the help of wireless transceiver module with alternating current outage monitoring circuit with the communication is established to short circuit analog circuit, short circuit analog circuit includes resistance R27, opto-coupler U7, resistance R25, resistance R26, triode Q5 and relay K1, the first input of opto-coupler U7 passes through resistance R27 connects the 5V power, the second input end of opto-coupler U7 is connected the main control unit, the first output end of opto-coupler U7 passes through 5V power is connected to resistance R26, the second output end ground connection of opto-coupler U7, the first output end of opto-coupler U7 still connects triode Q5's base, triode Q5's collecting electrode passes through resistance R25 ground connection, triode Q5's projecting pole passes through VCC power is connected to relay K1's input, first ac bus is connected to relay K1's first public end, and the second ac bus is connected to the second public end, the first normally closed end of relay K1 with relay K1's second normally closed end connection load, the first normally open end of relay K1 is connected the second normally open end of relay K1.
Further, in the utility model discloses in alternating current outage monitoring circuit is including exchanging sampling circuit, reference circuit and comparator U4, it connects to exchange sampling circuit's output comparator U4's homophase input end, reference circuit's output is connected comparator U4's inverting input end, comparator U4's output outage signal.
Further, in the utility model, the sampling circuit includes transformer T2, rectifier bridge, stabilivolt D7, resistance R12 and resistance R13, transformer T2's input is connected the ac bus, transformer T2's output is connected the input of rectifier bridge, the output of rectifier bridge is connected after series connection resistance R9, R10, R11 in proper order resistance R13's first end, resistance R13's second end is connected the homophase input of comparator U4, stabilivolt D7's positive pole ground connection, stabilivolt D7's negative pole is connected resistance R13's first end, resistance R12 connects in parallel on stabilivolt D7.
Further, in the present invention, the reference circuit includes a resistor R14, a regulator U5, a resistor R15, a resistor R16, a resistor R17, and a resistor R18, the inverting input terminal of the comparator U4 is connected to the first end of the resistor R14 through the resistor R17, the second end of the resistor R14 is connected to the 12V power supply, the inverting input terminal of the comparator U4 is also grounded through the resistor R18, the first end of the resistor R15 is connected to the connection point of the resistor R14 and the resistor R17, the second end of the resistor R15 is grounded through the resistor R16, the cathode of the regulator U5 is connected to the first end of the resistor R15, the anode of the regulator U5 is grounded, and the reference electrode of the regulator U5 is connected to the second end of the resistor R15.
Furthermore, in the present invention, the ac power outage monitoring circuit further includes a resistor R19, a resistor R20, a transistor Q4, a capacitor C4, a resistor R21, a resistor R22, a resistor R23, an operational amplifier U6, and a resistor R24, wherein a base of the transistor Q4 is connected to an output terminal of the comparator U4 through the resistor R19, a base of the transistor Q4 is further grounded through the resistor R20, an emitter of the transistor Q4 is grounded, a collector of the transistor Q4 is connected to an inverting input terminal of the operational amplifier U6, a collector of the transistor Q4 is further grounded through the capacitor C4, an inverting input terminal of the operational amplifier U6 is connected to a 5V power supply through the resistor R21, a non-inverting input terminal of the operational amplifier U6 is connected to the 5V power supply through the resistor R22, a non-inverting input terminal of the operational amplifier U6 is further grounded through the resistor R23, a non-inverting input terminal of the operational amplifier U6 is connected to the output terminal of the operational amplifier U6 through the resistor R24, the output end of the operational amplifier U6 is connected with the main control unit.
The utility model discloses a theory of operation and beneficial effect do:
the utility model discloses in simulate the fault situation of interchange bus short circuit through short circuit analog circuit, and through the jump state of exchanging the multistage interchange circuit breaker of outage monitoring circuit monitoring, realize the poor cooperation test of level of interchange short circuiter with this, test structure passes to long-range management and control platform through the LAN, also can further send to the terminal equipment of tester through wireless transceiver module on, make the tester can in time know the test result, and change the relatively poor interchange circuit breaker of level difference test.
Wherein, short circuit analog circuit's theory of operation does, send a low level signal by the main control unit to opto-coupler U7's second input, make opto-coupler U7 switch on, opto-coupler U7's first output is the low level, consequently triode Q5 switches on, relay K1 gets electric action this moment, relay K1's normally closed end disconnection, with relay K1's normally open end switch-on, because relay K1's first normally open end is connected the second and is normally open end.
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Drawings
FIG. 1 is a schematic block diagram of the present invention;
fig. 2 is a circuit diagram of the short circuit simulation circuit of the present invention;
fig. 3 is a circuit diagram of the ac power failure monitoring circuit of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive work, are related to the scope of the present invention.
Example 1
As shown in fig. 1-2, this embodiment provides an ac circuit breaker step-difference coordination testing apparatus for monitoring an ac system, the ac system includes multiple ac buses connected to each other through an ac circuit breaker, the ac system includes an ac outage monitoring circuit, a short circuit simulation circuit, a main control unit, a remote control platform and a wireless transceiver module, the ac outage monitoring circuit and the short circuit simulation circuit are both connected to the main control unit, the main control unit is connected to the remote control platform through a local area network, the remote control platform is connected to the wireless transceiver module and establishes communication with the ac outage monitoring circuit and the short circuit simulation circuit through the wireless transceiver module, the short circuit simulation circuit includes a resistor R27, an optocoupler U7, a resistor R25, a resistor R26, a triode Q5 and a relay K1, a first input end of the optocoupler U7 is connected to a 5V power supply through a resistor R27, a second input end of the optocoupler U7 is connected to the main control unit, the first output end of opto-coupler U7 passes through resistance R26 and connects the 5V power, the second output end ground connection of opto-coupler U7, the base of triode Q5 is still connected to the first output end of opto-coupler U7, the collector of triode Q5 passes through resistance R25 ground connection, the input connection VCC power that the projecting pole of triode Q5 passes through relay K1, first alternating current bus is connected to relay K1's first public end, second alternating current bus is connected to the second public end, load is connected to relay K1's first normally closed end and relay K1's second normally closed end, relay K1's first normally open end is connected the second normally open end of relay K1.
In this embodiment, it is assumed that the ac system includes a three-level ac bus, the short-circuit analog circuit is disposed at the third-level ac bus, and the ac power-off monitoring circuit in this embodiment is provided with two sets, the first set is used to monitor whether the first-level circuit breaker is in a step-by-step power-off state, the second set is used to monitor whether the second-level circuit breaker is in a protection power-off state, the short-circuit analog circuit is used to simulate a fault condition of an actual ac bus short-circuit, the main control unit in the short-circuit analog circuit sends a low-level signal to the second input terminal of the optocoupler U7 to turn on the optocoupler U7, the first output terminal of the optocoupler is at a low level, so that the triode Q5 is on, the relay K1 is powered on, the normally-closed terminal of the relay K1 is turned off and is connected to the normally-open terminal of the relay K1, and the first normally-open terminal of the relay K1 is connected to the second normally-open terminal, so that a short-circuit occurs in the relay K1, at this moment, the third-pole alternating current circuit breaker is in short circuit tripping, the optical coupler U7 has the effect that the main control unit is connected with a remote control platform through a local area network for preventing the mutual interference between the electric signals in the process of closing the relay and the electric signals of the main control unit, the remote control platform is provided with a wireless receiving and sending module, the process of simulating short circuit can be realized through the remote control of related testers, and the safety problem of the testers can be guaranteed.
Further, as shown in fig. 3, the ac power outage monitoring circuit in this embodiment includes an ac sampling circuit, a reference circuit, and a comparator U4, an output terminal of the ac sampling circuit is connected to a non-inverting input terminal of the comparator U4, an output terminal of the reference circuit is connected to an inverting input terminal of the comparator U4, and an output terminal of the comparator U4 outputs an outage signal.
In the process of range coordination test, if the first and second ac breakers generate tripping due to short circuit of the third ac bus, at this time, the tripping signal should be sent to the tester of the remote control platform in time, so that the tester can analyze and process the tripping signal, and determine whether the first and second ac breakers are tripped according to the change of the voltage value adopted by the ac sampling circuit, the comparator U4 will compare the collected voltage signal with the reference voltage generated by the reference circuit, the reference voltage of the reference circuit can be set according to the specific test condition, when the first and second ac buses work normally, the output terminal of the comparator U4 will output high level signal, when the first ac breaker is tripped, it indicates that the trip condition occurs, the output terminal of the comparator U4 in the first group of ac power failure monitoring circuits will output low level signal, when the second-stage alternating current circuit breaker is tripped, the output end of the comparator U4 in the second group of alternating current power failure monitoring circuits outputs a low-level signal, and the low-level signal plays a role in protecting power failure.
Further, as shown in fig. 3, the sampling circuit in this embodiment includes a transformer T2, a rectifier bridge, a voltage regulator tube D7, a resistor R12, and a resistor R13, an input end of the transformer T2 is connected to an ac bus, an output end of the transformer T2 is connected to an input end of the rectifier bridge, an output end of the rectifier bridge is sequentially connected in series with resistors R9, R10, and R11 and then connected to a first end of a resistor R13, a second end of the resistor R13 is connected to a non-inverting input end of a comparator U4, an anode of the voltage regulator tube D7 is grounded, a cathode of the voltage regulator tube D7 is connected to a first end of the resistor R13, and the resistor R12 is connected in parallel to the voltage regulator tube D7.
Because the alternating voltage in the alternating current bus is too high, voltage reduction needs to be carried out before sampling, the transformer T2 can carry out voltage reduction processing on the tested alternating current bus, the alternating current input voltage after voltage reduction is subjected to full-wave rectification through a rectification circuit formed by a diode D3, a diode D4, a diode D and a diode D6, and then voltage division is carried out through a resistor R9, a resistor R10, a resistor R11 and a resistor R12, so that a rectification voltage sampling signal of the alternating current input voltage is obtained and is connected to the non-inverting input end of the comparator U4.
Further, as shown in fig. 3, in this embodiment, the reference circuit includes a resistor R14, a regulator U5, a resistor R15, a resistor R16, a resistor R17, and a resistor R18, an inverting input terminal of a comparator U4 is connected to a first end of the resistor R14 through a resistor R17, a second end of the resistor R14 is connected to the 12V power supply, an inverting input terminal of the comparator U4 is further grounded through a resistor R18, a first end of the resistor R15 is connected to a connection point of the resistor R14 and the resistor R17, a second end of the resistor R15 is grounded through a resistor R16, a cathode of the regulator U5 is connected to a first end of the resistor R15, an anode of the regulator U5 is grounded, and a reference electrode of the regulator U5 is connected to a second end of the resistor R15.
The 12V power supply generates a stable voltage under the action of the regulator U5, in this embodiment, it is assumed that a 5V reference voltage Vref1 is generated, the 5V reference voltage is divided by the resistor R17 and the resistor R18, a lower reference voltage is generated at the inverting input terminal of the comparator U4 after the voltage is divided by the resistor R17 and the resistor R18, the reference voltage is compared with the sampling voltage, when the ac voltage of the ac bus to be measured is normal, the sampling voltage is greater than the reference voltage, the output terminal of the comparator U4 outputs a high level signal, and when the ac bus to be measured is tripped out of level, the output terminal of the comparator U4 changes the original high level signal into a low level signal.
Further, as shown in fig. 3, the ac power outage monitoring circuit in this embodiment further includes a resistor R19, a resistor R20, a transistor Q4, a capacitor C4, a resistor R21, a resistor R22, a resistor R23, an operational amplifier U6, and a resistor R24, a base of a transistor Q4 is connected to an output terminal of the comparator U4 through a resistor R19, a base of the transistor Q4 is also grounded through a resistor R20, an emitter of the transistor Q4 is grounded, a collector of the transistor Q4 is connected to an inverting input terminal of the operational amplifier U6, a collector of the transistor Q4 is also grounded through a capacitor C4, an inverting input terminal of the operational amplifier U6 is connected to a 5V power supply through a resistor R21, a non-inverting input terminal of the operational amplifier U6 is connected to the 5V power supply through a resistor R22, a non-inverting input terminal of the operational amplifier U6 is also grounded through a resistor R23, a non-inverting input terminal of the operational amplifier U5 6 is connected to an output terminal of the operational amplifier U6 through a resistor R39 24, and an output terminal of the operational amplifier U6 is connected to the main control unit.
When the alternating current voltage of the tested alternating current bus is normal, the output end of the comparator U4 outputs a high level signal, the high level signal is a pulse wave with a large duty ratio, due to the discharging effect of the capacitor C4, after the discharging of the capacitor C4 is finished, the 5V reference voltage can charge the capacitor C4 again through the resistor R21, so that the triode Q4 is in a conducting state in most of the alternating current period when the alternating current input is normal, the voltage on the capacitor is not enough to be charged to be higher than the voltage of the same-phase input end of the operational amplifier U6, when the alternating current voltage is normal, the operational amplifier U6 outputs a high level, when the alternating current voltage of the tested alternating current bus is normal, the output end of the comparator U4 is rapidly changed into a low level to cut off the triode Q4, the capacitor C4 is rapidly charged to be higher than the voltage of the same-phase input end of the operational amplifier U6 through the 5V reference voltage and the resistor R21, so that the operational amplifier U6 outputs a low level, this part is in order to can send the power failure condition faster to the relevant tester of remote management and control platform when the condition of tripping more appears, adjusts the delay time of circuit through adjusting the value of resistance R21 and electric capacity C4, and the smaller resistance R21 and electric capacity C4 are, and the shorter delay time is, and the more fast is monitored to the alternating current outage.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. Alternating current breaker level difference cooperation testing arrangement for monitor alternating current system, alternating current system includes multistage alternating current bus, and is multistage between the alternating current bus is connected through alternating current breaker, its characterized in that, including alternating current outage monitoring circuitry, short circuit analog circuit, main control unit, long-range management and control platform and wireless transceiver module, alternating current outage monitoring circuitry and short circuit analog circuit all are connected with the main control unit, the main control unit pass through the LAN with long-range management and control platform communication connection, long-range management and control platform is connected wireless transceiver module, and with the help of wireless transceiver module with alternating current outage monitoring circuitry with the communication is established to short circuit analog circuit, short circuit analog circuit includes resistance R27, opto-coupler U7, resistance R25, resistance R26, triode Q5 and relay K1, the first input of opto-coupler U7 passes through resistance R27 connects the 5V power, the second input of opto-coupler U7 is connected the main control unit, the first output of opto-coupler U7 passes through 5V power is connected to resistance R26, the second output ground connection of opto-coupler U7, the first output of opto-coupler U7 still connects triode Q5's base, triode Q5's collecting electrode passes through resistance R25 ground connection, triode Q5's projecting pole passes through VCC power is connected to relay K1's input, first ac bus is connected to relay K1's first common port, and the second ac bus is connected to the second common port, the first normally closed end of relay K1 with the second normally closed end of relay K1 connects the load, the first normally open end of relay K1 connects the second normally open end of relay K1.
2. The AC circuit breaker step coordination test device according to claim 1, wherein said AC power failure monitoring circuit comprises an AC sampling circuit, a reference circuit and a comparator U4, an output end of said AC sampling circuit is connected to a non-inverting input end of said comparator U4, an output end of said reference circuit is connected to an inverting input end of said comparator U4, and an output end of said comparator U4 outputs a power failure signal.
3. The alternating current breaker step matching testing device according to claim 2, wherein the sampling circuit comprises a transformer T2, a rectifier bridge, a voltage regulator tube D7, a resistor R12 and a resistor R13, the input end of the transformer T2 is connected with the alternating current bus, the output end of the transformer T2 is connected with the input end of the rectifier bridge, the output end of the rectifier bridge is sequentially connected with resistors R9, R10 and R11 in series and then connected with the first end of the resistor R13, the second end of the resistor R13 is connected with the non-inverting input end of the comparator U4, the anode of the voltage regulator tube D7 is grounded, the cathode of the voltage regulator tube D7 is connected with the first end of the resistor R13, and the resistor R12 is connected to the voltage regulator tube D7 in parallel.
4. The apparatus as claimed in claim 2, wherein the reference circuit comprises a resistor R14, a regulator U5, a resistor R15, a resistor R16, a resistor R17 and a resistor R18, an inverting input terminal of the comparator U4 is connected to a first terminal of the resistor R14 through the resistor R17, a second terminal of the resistor R14 is connected to the 12V power supply, an inverting input terminal of the comparator U4 is further connected to ground through the resistor R18, a first terminal of the resistor R15 is connected to a connection point between the resistor R14 and the resistor R17, a second terminal of the resistor R15 is connected to ground through the resistor R16, a cathode of the regulator U5 is connected to a first terminal of the resistor R15, an anode of the regulator U5 is connected to ground, and a reference electrode of the regulator U5 is connected to a second terminal of the resistor R15.
5. The ac circuit breaker step matching test device according to claim 2, wherein said ac power failure monitoring circuit further comprises a resistor R19, a resistor R20, a transistor Q4, a capacitor C4, a resistor R21, a resistor R22, a resistor R23, an operational amplifier U6 and a resistor R24, wherein a base of said transistor Q4 is connected to an output terminal of said comparator U4 through said resistor R19, a base of said transistor Q4 is further grounded through said resistor R20, an emitter of said transistor Q4 is grounded, a collector of said transistor Q4 is connected to an inverting input terminal of said operational amplifier U6, a collector of said transistor Q4 is further grounded through said capacitor C4, an inverting input terminal of said operational amplifier U6 is connected to a 5V power supply through said resistor R21, a non-inverting input terminal of said operational amplifier U6 is connected to a 5V power supply through said resistor R22, a non-inverting input terminal of said operational amplifier U6 is further grounded through said resistor R23, the non-inverting input end of the operational amplifier U6 is connected with the output end of the operational amplifier U6 through the resistor R24, and the output end of the operational amplifier U6 is connected with the master control unit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221108809.2U CN217332751U (en) | 2022-05-10 | 2022-05-10 | Alternating current circuit breaker level difference cooperation testing device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221108809.2U CN217332751U (en) | 2022-05-10 | 2022-05-10 | Alternating current circuit breaker level difference cooperation testing device |
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| CN217332751U true CN217332751U (en) | 2022-08-30 |
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