CN213518627U - Insulation alarm device for alternating current power supply system of transformer substation - Google Patents
Insulation alarm device for alternating current power supply system of transformer substation Download PDFInfo
- Publication number
- CN213518627U CN213518627U CN202023124921.9U CN202023124921U CN213518627U CN 213518627 U CN213518627 U CN 213518627U CN 202023124921 U CN202023124921 U CN 202023124921U CN 213518627 U CN213518627 U CN 213518627U
- Authority
- CN
- China
- Prior art keywords
- triode
- power supply
- circuit
- resistor
- diode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The utility model relates to a transformer substation uses power technical field, the insulating alarm device of transformer substation alternating current power supply system is proposed, include a plurality of leakage current sensors of being connected with collection module, collection module is a plurality of, a plurality of collection modules all are connected with the monitoring host computer, a plurality of leakage current sensors are used for detecting the leakage current of each feeder branch road of alternating current power supply, still include alarm circuit, alarm circuit includes triode Q2 and triode Q4, triode Q1's base is passed through resistance R12 and is connected with power VIN, triode Q1's projecting pole ground connection, triode Q1's collecting electrode passes through resistance R10 and connects power VIN, triode Q1's collecting electrode still is connected with electric capacity C3's anodal, electric capacity C3's negative pole is connected with triode Q2's base. Through the technical scheme, the problem that in the prior art, the insulation monitoring of the alternating current power supply system of the transformer substation is difficult is solved.
Description
Technical Field
The utility model relates to a power technology field is used in transformer substation station, and is concrete, relates to the insulating alarm device of transformer substation's alternating current power supply system.
Background
The station alternating current power supply is used as a power supply for a transformer cooling fan, domestic electricity, a fire pump, a charging device, power distribution maintenance and the like, and is a basic guarantee for safe and reliable operation of a transformer substation. Due to the complicated wiring of the on-site alternating current power supply of the transformer substation, the improper safety measures, the quality of the electric equipment, the aging of lines and other problems, the insulation performance is failed, and not only can the tripping of an alternating current feed switch and the power failure of the electric equipment be caused, but also serious accidents such as fire disasters, total-station alternating current power failure, shutdown of the transformer substation and the like can be caused. Therefore, the insulation monitoring technology research of the AC power supply system for the station is developed, the insulation alarm device of the AC power supply system is developed, the on-line monitoring of the insulation condition of the AC power supply system for the station is realized, ready-made personnel are reminded to eliminate insulation faults in time, and the operation safety of the AC power supply system for the station and the power system is effectively improved.
SUMMERY OF THE UTILITY MODEL
The utility model provides an insulating alarm device of transformer substation alternating current power supply system has solved the problem of transformer substation alternating current power supply system insulation monitoring difficulty among the prior art.
The technical scheme of the utility model as follows: comprises a plurality of leakage current sensors connected with an acquisition module, wherein the acquisition module is in plurality, the acquisition modules are all connected with a monitoring host, the leakage current sensors are used for detecting the leakage current of each feeder line branch of the alternating current power supply,
still include alarm circuit, alarm circuit includes triode Q2 and triode Q4, triode Q1's base is passed through resistance R12 and is connected with power VIN, triode Q1's projecting pole ground connection, triode Q1's collecting electrode passes through resistance R10 and connects power VIN, triode Q1's collecting electrode still is connected with electric capacity C3's positive pole, electric capacity C3's negative pole is connected with triode Q2's base,
the base electrode of the triode Q2 is also connected with a power supply VIN through a resistor R11, the emitting electrode of the triode Q2 is grounded, the collector electrode of the triode Q2 is connected with the power supply VIN through a resistor R13, the collector electrode of the triode Q2 is also connected with the positive electrode of a capacitor C4, the negative electrode of the capacitor C4 is connected with the base electrode of the triode Q1,
the collector of the triode Q2 is connected to the G pole of a MOS transistor Q3 through a diode D9, the S pole of the MOS transistor Q3 is grounded, the D pole of the MOS transistor Q3 is connected with one end of a loudspeaker, the other end of the loudspeaker is connected with a power supply VIN,
the collection module includes the control output circuit who is connected with master control circuit, control output circuit includes triode Q4, triode Q4's base with master control circuit connects, triode Q4's projecting pole ground connection, triode Q4's collecting electrode is connected with the one end of relay K1 coil, the other end and the power 5V of relay K1 coil are connected, relay K1's normally open contact concatenates between power VIN and resistance R10.
Further, the collection module still includes the leakage current collection circuit, the leakage current collection circuit includes resistance R1, fortune is put U1A and fortune and is put U1B, resistance R1 connects in parallel at the output of leakage current sensor, resistance R1's one end ground connection, the other end inserts the same phase input end of fortune is put U1A, the inverting input end of fortune is put U1A and is passed through resistance R3 ground connection, the output of fortune is put U1A and is passed through resistance R8 and insert the inverting input end,
the output that U1A was put to fortune passes through resistance R4 and inserts U1B's homophase input end is put to fortune, U1B's homophase input end is still connected with reference voltage VREF to fortune, U1B's inverting input end is put to fortune passes through resistance R6 ground connection, U1B's output is put to fortune passes through resistance R7 and inserts inverting input end, U1B's output is put to fortune still with master control circuit connects.
Further, the reference source circuit comprises a resistor R14 and a resistor R15 which are connected in series, one end of the resistor R14 is connected with a power supply 3.3V, one end of the resistor R15 is grounded, the series point of the resistor R14 and the resistor R15 is connected with the non-inverting input end of the operational amplifier U1C, the output end of the operational amplifier U1C is connected with the inverting input end, and the output end of the operational amplifier U1C outputs the reference voltage VREF.
Furthermore, the acquisition module is connected with the monitoring host computer through an RS485 communication circuit,
RS485 communication circuit is including triode Q5, RS485 interface chip U2 and RS485 interface terminal J1 that connect gradually, triode Q5's base with master control circuit connects, triode Q5's emitter ground, triode Q5's collecting electrode passes through resistance R20 and is connected with power 5V, triode Q5's collecting electrode still with RS485 interface chip U2's DE end,/RE connects, RS485 interface chip U2's RO end and DI end all with master control circuit connects, RS485 interface chip U2's A end and B end all with RS485 interface terminal J1 connects, RS485 interface terminal J1 with the monitoring host computer is connected.
Further, the power supply circuit comprises a forward charging branch circuit, the forward charging branch circuit comprises a capacitor C2, a diode D2, a diode D1, a battery B1 and a diode D5 which are connected in sequence, one end of the capacitor C2 is connected with a power supply L line, the cathode of the diode D5 is connected with a power supply N line,
the power circuit further comprises a negative charging branch circuit, the negative charging branch circuit comprises a diode D3, a diode D1, a battery B1, a diode D4 and a capacitor C2 which are sequentially connected, the anode of the diode D3 is connected with a power N line, one end of the capacitor C2 is connected with a power L line,
the positive electrode of the battery B1 is output to a power source VIN through a diode D6, the power source VIN is also connected with the cathode of a diode D7, and the anode of the diode D7 is connected with an external direct current power source 12 VIN.
Further, a resistor R9 is connected in parallel to both ends of the capacitor C2.
Further, the battery potentiometer also comprises a thyristor VT1 and a potentiometer RP1, two fixed ends of the potentiometer RP1 are connected with the battery B1 in parallel, the sliding end of the potentiometer RP1 is connected with the control end of the thyristor VT1, the anode of the thyristor VT1 is connected with one fixed end of the potentiometer RP1, and the cathode of the thyristor VT1 is connected with the other fixed end of the potentiometer RP 1.
The utility model discloses a theory of operation and beneficial effect do:
the utility model discloses a set up leakage current sensor in each feeder branch road of AC power supply, gather the leakage current of each feeder branch road of AC power supply, a plurality of leakage current sensor's output current signal access collection module, collection module reads each leakage current sensor's numerical value, and send to the monitoring host computer, the monitoring host computer analyzes each leakage current sensor's numerical value, handle, judge the trend of change of leakage current, when judging the insulating properties variation, the monitoring host computer sends the instruction to collection module, collection module passes through control output circuit and starts alarm circuit work, remind the field personnel in time to take measures, avoid the AC feed switch tripping operation because of insulation fault leads to, the consumer loses the electricity, arouse the conflagration even, total powerstation exchanges the loss electricity, serious accidents such as outage.
The specific working process is as follows: when the acquisition module receives an instruction sent by the monitoring host, the main control circuit sets a control signal ALARM to be at a high level, the triode Q4 is conducted, the coil of the relay K1 is electrified, the normally open contact of the relay K1 is closed, the ALARM circuit is electrified, the multi-resonant circuit consisting of the triode Q1, the triode Q2 and the peripheral resistance-capacitance elements starts to work, the collector of the triode Q2 outputs a pulse signal, and the pulse signal is amplified by the MOS tube Q3 to drive the loudspeaker to give an ALARM sound so as to remind field workers to take measures in time.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a schematic circuit block diagram of the present invention;
FIG. 2 is a schematic diagram of a middle alarm circuit of the present invention;
FIG. 3 is a schematic diagram of a control output circuit of the present invention;
FIG. 4 is a schematic diagram of a leakage current collecting circuit according to the present invention;
FIG. 5 is a schematic diagram of a reference source circuit according to the present invention;
fig. 6 is a schematic diagram of an RS485 communication circuit in the present invention;
FIG. 7 is a schematic diagram of a power supply circuit according to the present invention;
in the figure: the monitoring system comprises a leakage current sensor 1, an acquisition module 2, a main control circuit 21, a control output circuit 22, a leakage current acquisition circuit 23, a reference source circuit 24, an RS485 communication circuit 25, a power circuit 26, a monitoring host computer 3 and an alarm circuit 4.
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.
As shown in fig. 1-2, the insulation alarm device of the ac power supply system of the substation in this embodiment includes a plurality of leakage current sensors connected to a plurality of collection modules, each of the collection modules is connected to a monitoring host, the plurality of leakage current sensors are used for detecting leakage current of each feeder branch of the ac power supply,
the alarm circuit comprises a triode Q2 and a triode Q4, the base electrode of the triode Q1 is connected with a power supply VIN through a resistor R12, the emitting electrode of the triode Q1 is grounded, the collector electrode of the triode Q1 is connected with the power supply VIN through a resistor R10, the collector electrode of the triode Q1 is also connected with the positive electrode of a capacitor C3, the negative electrode of the capacitor C3 is connected with the base electrode of the triode Q2,
the base electrode of the triode Q2 is also connected with a power supply VIN through a resistor R11, the emitter electrode of the triode Q2 is grounded, the collector electrode of the triode Q2 is connected with the power supply VIN through a resistor R13, the collector electrode of the triode Q2 is also connected with the anode of a capacitor C4, the cathode of the capacitor C4 is connected with the base electrode of the triode Q1,
the collector of the triode Q2 is connected to the G pole of the MOS transistor Q3 through the diode D9, the S pole of the MOS transistor Q3 is grounded, the D pole of the MOS transistor Q3 is connected with one end of the loudspeaker, the other end of the loudspeaker is connected with the power supply VIN,
as shown in fig. 3, the acquisition module includes a control output circuit connected to the main control circuit, the control output circuit includes a transistor Q4, the base of the transistor Q4 is connected to the main control circuit, the emitter of the transistor Q4 is grounded, the collector of the transistor Q4 is connected to one end of the coil of the relay K1, the other end of the coil of the relay K1 is connected to the power supply 5V, and the normally open contact of the relay K1 is connected in series between the power supply VIN and the resistor R10.
In the embodiment, the leakage current sensors are arranged on the feeder branches of the alternating-current power supply, leakage currents of the feeder branches of the alternating-current power supply are collected, output current signals of the leakage current sensors are connected to the collection module, the collection module reads numerical values of the leakage current sensors and sends the numerical values to the monitoring host, the monitoring host analyzes and processes the numerical values of the leakage current sensors, the change trend of the leakage currents is judged, when insulation performance is judged to be poor, the monitoring host sends an instruction to the collection module, the collection module starts an alarm circuit to work through a control output circuit, field personnel are reminded to take measures in time, and serious accidents such as tripping of an alternating-current feed switch, power loss of electric equipment and even fire disasters, total-station alternating current power loss, shutdown of a transformer substation.
The specific working process is as follows: when the acquisition module receives an instruction sent by the monitoring host, the main control circuit sets a control signal ALARM to be at a high level, the triode Q4 is conducted, the coil of the relay K1 is electrified, the normally open contact of the relay K1 is closed, the ALARM circuit is electrified, the multi-resonant circuit consisting of the triode Q1, the triode Q2 and the peripheral resistance-capacitance elements starts to work, the collector of the triode Q2 outputs a pulse signal, and the pulse signal is amplified by the MOS tube Q3 to drive the loudspeaker to give an ALARM sound so as to remind field workers to take measures in time.
Further, as shown in fig. 4, the acquisition module further includes a leakage current acquisition circuit, the leakage current acquisition circuit includes a resistor R1, an operational amplifier U1A and an operational amplifier U1B, the resistor R1 is connected in parallel to the output end of the leakage current sensor, one end of the resistor R1 is grounded, the other end is connected to the non-inverting input end of the operational amplifier U1A, the inverting input end of the operational amplifier U1A is grounded through a resistor R3, the output end of the operational amplifier U1A is connected to the inverting input end through a resistor R8,
the output end of the operational amplifier U1A is connected to the non-inverting input end of the operational amplifier U1B through a resistor R4, the non-inverting input end of the operational amplifier U1B is also connected to a reference voltage VREF, the inverting input end of the operational amplifier U1B is grounded through a resistor R6, the output end of the operational amplifier U1B is connected to the inverting input end through a resistor R7, and the output end of the operational amplifier U1B is also connected to a main control circuit.
The working principle of the leakage current acquisition circuit is as follows: as shown in fig. 4, the output current of the leakage current sensor is connected to the terminal P1, the output of the leakage current sensor is an alternating current signal of-0.15 mA to 0.15mA, the resistor R1 is connected in parallel to two ends of the terminal P1, and the alternating current signal of-0.15 mA to 0.15mA output by the leakage current sensor is converted into a voltage signal of-75 mV to 75 mV; after amplification of the operational amplifier U1A, a voltage signal of-1.5V to 1.5V is output, a reference voltage VREF is superposed on a non-inverting input end of the operational amplifier U1B, the voltage signal is converted into a voltage signal of 0V to 3.3V, and the voltage signal is input into an AD sampling channel of the main control circuit, so that the main control circuit can accurately read a leakage current signal.
Further, the reference source circuit is further included, as shown in fig. 5, the reference source circuit includes a resistor R14 and a resistor R15 which are connected in series, one end of the resistor R14 is connected with the power supply 3.3V, one end of the resistor R15 is grounded, a series point of the resistor R14 and the resistor R15 is connected with a non-inverting input terminal of the operational amplifier U1C, an output terminal of the operational amplifier U1C is connected to an inverting input terminal, and an output terminal of the operational amplifier U1C outputs a reference voltage VREF.
The resistor R14 and the resistor R15 are connected in series between a power supply 3.3V and the ground, divide voltage and output 1.65V reference voltage, and are superposed to the non-inverting input end of the operational amplifier U1B after impedance matching is carried out by a voltage follower formed by the operational amplifier U1C, so that the regulation of leakage current signals is realized. The circuit has simple structure and reliable operation.
Further, the acquisition module is connected with the monitoring host through an RS485 communication circuit, as shown in fig. 6, the RS485 communication circuit includes a triode Q5, an RS485 interface chip U2 and an RS485 interface terminal J1 which are connected in sequence, a base of the triode Q5 is connected with the main control circuit, an emitter of the triode Q5 is grounded, a collector of the triode Q5 is connected with a power supply 5V through a resistor R20, a collector of the triode Q5 is also connected with a DE end,/RE of the RS485 interface chip U2, an RO end and a DI end of the RS485 interface chip U2 are both connected with the main control circuit, an a end and a B end of the RS485 interface chip U2 are both connected with the RS485 interface terminal J1, and the RS485 interface terminal J1 is connected with the monitoring host.
The multi-path acquisition module is connected with the monitoring host through an RS485 communication mode, networking is simple, differential transmission is adopted in RS485 communication, anti-interference performance is strong, and accurate transmission of signals is guaranteed. The PE2 signal output by the main control circuit is a 3.3V pulse signal, and is subjected to level conversion by a triode Q5 and then is accessed to an enabling end DE and/RE of an RS485 interface chip U2; the RO end and the DI end of the RS485 interface chip U2 are used for carrying out data communication with the main control circuit; the A end and the B end of the RS485 interface chip U2 are led out to an RS485 interface terminal J1, so that the connection with a monitoring host is facilitated.
Further, the power supply circuit comprises a forward charging branch circuit, as shown in fig. 7, the forward charging branch circuit comprises a capacitor C2, a diode D2, a diode D1, a battery B1 and a diode D5 which are connected in sequence, one end of the capacitor C2 is connected with a power supply L line, a cathode of the diode D5 is connected with a power supply N line,
the power circuit also comprises a negative charging branch circuit, the negative charging branch circuit comprises a diode D3, a diode D1, a battery B1, a diode D4 and a capacitor C2 which are connected in sequence, the anode of the diode D3 is connected with a power supply N line, one end of the capacitor C2 is connected with a power supply L line,
the positive electrode of the battery B1 is output to the power source VIN through the diode D6, the power source VIN is also connected to the cathode of the diode D7, and the anode of the diode D7 is connected to the external dc power source 12 VIN.
In this embodiment, a positive charging branch and a negative charging branch are arranged in a power circuit to charge a battery B1, the terminal voltage of the battery B1 is 10V, when an external dc power supply 12VIN is normal, a diode D7 is turned on, and the external dc power supply 12VIN serves as a power supply VIN to supply power to an acquisition module; when the external direct-current power supply 12VIN is disconnected, the diode D6 is turned on, and the battery B1 serves as a power supply VIN to supply power to the acquisition module, so that normal power supply of the acquisition module is ensured.
Wherein the capacitive reactance of the capacitor C2 ensures a constant charging of the battery.
Further, a resistor R9 is connected in parallel to both ends of the capacitor C2.
In the process of switching between positive charging and negative charging, the capacitor C2 discharges through the resistor R9, which is beneficial to the rapid switching of the voltage across the capacitor C2.
Further, the battery charging system comprises a thyristor VT1 and a potentiometer RP1, two fixed ends of the potentiometer RP1 are connected with the battery B1 in parallel, the sliding end of the potentiometer RP1 is connected with the control end of the thyristor VT1, the anode of the thyristor VT1 is connected with one fixed end of the potentiometer RP1, and the cathode of the thyristor VT1 is connected with the other fixed end of the potentiometer RP 1.
When the voltage at the two ends of the battery B1 exceeds a set value, the partial voltage of the potentiometer RP1 reaches the trigger voltage of the thyristor VT1, the thyristor VT1 is conducted, the battery B1 is stopped being charged, and the battery B1 is prevented from being overcharged. The trigger voltage of the thyristor VT1 is reduced along with the rise of the temperature, so that the voltage for stopping charging the battery B1 is reduced, and the battery is protected from overtemperature within a certain range.
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 (7)
1. The transformer substation alternating current power supply system insulation alarm device is characterized by comprising a plurality of leakage current sensors (1) connected with acquisition modules (2), wherein the acquisition modules (2) are multiple, the acquisition modules (2) are all connected with a monitoring host (3), the leakage current sensors (1) are used for detecting leakage current of each feeder line branch of an alternating current power supply,
still include alarm circuit (4), alarm circuit (4) include triode Q2 and triode Q4, triode Q1's base is passed through resistance R12 and is connected with power VIN, triode Q1's projecting pole ground connection, triode Q1's collecting electrode passes through resistance R10 and connects power VIN, triode Q1's collecting electrode still is connected with electric capacity C3's positive pole, electric capacity C3's negative pole is connected with triode Q2's base,
the base electrode of the triode Q2 is also connected with a power supply VIN through a resistor R11, the emitting electrode of the triode Q2 is grounded, the collector electrode of the triode Q2 is connected with the power supply VIN through a resistor R13, the collector electrode of the triode Q2 is also connected with the positive electrode of a capacitor C4, the negative electrode of the capacitor C4 is connected with the base electrode of the triode Q1,
the collector of the triode Q2 is connected to the G pole of a MOS transistor Q3 through a diode D9, the S pole of the MOS transistor Q3 is grounded, the D pole of the MOS transistor Q3 is connected with one end of a loudspeaker, the other end of the loudspeaker is connected with a power supply VIN,
collection module (2) include control output circuit (22) be connected with master control circuit (21), control output circuit (22) include triode Q4, triode Q4's base with master control circuit (21) are connected, triode Q4's projecting pole ground connection, triode Q4's collecting electrode is connected with the one end of relay K1 coil, the other end and the power 5V of relay K1 coil are connected, relay K1's normally open contact concatenates between VIN power and resistance R10.
2. The substation alternating current power supply system insulation alarm device according to claim 1, wherein the collection module (2) further comprises a leakage current collection circuit (23), the leakage current collection circuit (23) comprises a resistor R1, an operational amplifier U1A and an operational amplifier U1B, the resistor R1 is connected in parallel with the output end of the leakage current sensor (1), one end of the resistor R1 is grounded, the other end of the resistor R1 is connected to the non-inverting input end of the operational amplifier U1A, the inverting input end of the operational amplifier U1A is grounded through a resistor R3, the output end of the operational amplifier U1A is connected to the inverting input end through a resistor R8,
the output of op-amp U1A passes through resistance R4 and inserts the non inverting input end of op-amp U1B, the non inverting input end of op-amp U1B still is connected with reference voltage VREF, the inverting input end of op-amp U1B passes through resistance R6 ground connection, the output of op-amp U1B passes through resistance R7 and inserts the inverting input end, the output of op-amp U1B still with main control circuit (21) are connected.
3. The substation alternating current power supply system insulation alarm device according to claim 2, further comprising a reference source circuit (24), wherein the reference source circuit (24) comprises a resistor R14 and a resistor R15 which are connected in series, one end of the resistor R14 is connected with a power supply at 3.3V, one end of the resistor R15 is grounded, the series point of the resistor R14 and the resistor R15 is connected with a non-inverting input end of an operational amplifier U1C, an output end of the operational amplifier U1C is connected with an inverting input end, and an output end of the operational amplifier U1C outputs the reference voltage VREF.
4. The substation alternating current power supply system insulation alarm device according to claim 1, wherein the collection module (2) is connected with the monitoring host (3) through an RS485 communication circuit (25),
RS485 communication circuit (25) including triode Q5, RS485 interface chip U2 and the RS485 interface terminal J1 that connect gradually, triode Q5's base with master control circuit (21) are connected, triode Q5's projecting pole ground connection, triode Q5's collecting electrode passes through resistance R20 and is connected with power 5V, triode Q5's collecting electrode still with the DE end of RS485 interface chip U2,/RE is connected, RS485 interface chip U2's RO end and DI end all with master control circuit (21) are connected, RS485 interface chip U2's A end and B end all with RS485 interface terminal J1 connects, RS485 interface terminal J1 with monitoring host (3) connect.
5. The substation alternating current power supply system insulation alarm device according to claim 1, further comprising a power supply circuit (26), wherein the power supply circuit (26) comprises a forward charging branch, the forward charging branch comprises a capacitor C2, a diode D2, a diode D1, a battery B1 and a diode D5 which are connected in sequence, one end of the capacitor C2 is connected with a power supply L line, a cathode of the diode D5 is connected with a power supply N line,
the power supply circuit (26) further comprises a negative charging branch circuit, the negative charging branch circuit comprises a diode D3, a diode D1, a battery B1, a diode D4 and a capacitor C2 which are sequentially connected, the anode of the diode D3 is connected with a power supply N line, one end of the capacitor C2 is connected with a power supply L line,
the positive electrode of the battery B1 is output to a power source VIN through a diode D6, the power source VIN is also connected with the cathode of a diode D7, and the anode of the diode D7 is connected with an external direct current power source 12 VIN.
6. The substation alternating current power supply system insulation alarm device according to claim 5, wherein a resistor R9 is connected in parallel with two ends of the capacitor C2.
7. The substation alternating current power supply system insulation alarm device according to claim 5, further comprising a thyristor VT1 and a potentiometer RP1, wherein two fixed ends of the potentiometer RP1 are connected in parallel with the battery B1, a sliding end of the potentiometer RP1 is connected with a control end of the thyristor VT1, an anode of the thyristor VT1 is connected with one fixed end of the potentiometer RP1, and a cathode of the thyristor VT1 is connected with the other fixed end of the potentiometer RP 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023124921.9U CN213518627U (en) | 2020-12-22 | 2020-12-22 | Insulation alarm device for alternating current power supply system of transformer substation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023124921.9U CN213518627U (en) | 2020-12-22 | 2020-12-22 | Insulation alarm device for alternating current power supply system of transformer substation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213518627U true CN213518627U (en) | 2021-06-22 |
Family
ID=76428484
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202023124921.9U Active CN213518627U (en) | 2020-12-22 | 2020-12-22 | Insulation alarm device for alternating current power supply system of transformer substation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213518627U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115932565A (en) * | 2022-11-15 | 2023-04-07 | 国网河南省电力公司安阳供电公司 | Power transmission and transformation high voltage circuit breaker monitoring circuit |
-
2020
- 2020-12-22 CN CN202023124921.9U patent/CN213518627U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115932565A (en) * | 2022-11-15 | 2023-04-07 | 国网河南省电力公司安阳供电公司 | Power transmission and transformation high voltage circuit breaker monitoring circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203466383U (en) | Intelligent static safe energy-saving multifunctional socket with zero power consumption | |
| CN207010221U (en) | A kind of intelligent wireless controller switching equipment of fault detect | |
| CN202737576U (en) | Intelligent measure-control apparatus used for low voltage power distribution network | |
| CN103321814B (en) | Car emergency ignition installation | |
| CN101764426A (en) | Protective device for on-line discharge capacity test of storage battery and testing method thereof | |
| CN107834977A (en) | A kind of photovoltaic module intelligent wiring box and its control method | |
| CN102664454A (en) | Non-floating charging type substation direct current power supply system based on iron lithium battery | |
| CN103219766A (en) | Non floating charge lithium battery type DC (direct current) power system used for station | |
| CN205792453U (en) | A kind of distributed photovoltaic system online insulation against ground safety monitoring assembly | |
| CN213518627U (en) | Insulation alarm device for alternating current power supply system of transformer substation | |
| CN203326621U (en) | Non floating charge lithium battery type DC (direct current) power system used for station | |
| CN103001282B (en) | Charge variable current protector | |
| CN105490361A (en) | Intelligent charger with universal serial bus (USB) interface | |
| CN111929523B (en) | Low-voltage transformer area topology rapid identification system | |
| CN206497184U (en) | A kind of detection means and the detection circuit for contactor | |
| CN201639353U (en) | Safety device for testing discharge capacity of accumulator battery without off line | |
| CN214011469U (en) | Insulation monitoring device for alternating current power supply system of transformer substation | |
| CN206378569U (en) | A kind of voltage relay abnormal detector | |
| CN206894301U (en) | A kind of double accessory power supplys and the energy-storage system based on double accessory power supplys | |
| CN202550664U (en) | Direct current power supply system of non-floating charge type transformer substation based on lithium iron battery | |
| CN205693413U (en) | Charging electric vehicle controller | |
| CN212845895U (en) | Voltage comparator module circuit in short-circuit fault warning device of ammeter | |
| CN208971247U (en) | The long-range integrated monitoring device of DC power supply | |
| CN208672782U (en) | A kind of battery current measuring device | |
| CN201750182U (en) | Direct current power supply cabinet with voltage-reducing protection function |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |