CN212304708U - Cross-region integrated power supply system for relay protection acquisition terminal - Google Patents
Cross-region integrated power supply system for relay protection acquisition terminal Download PDFInfo
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- CN212304708U CN212304708U CN201922261657.4U CN201922261657U CN212304708U CN 212304708 U CN212304708 U CN 212304708U CN 201922261657 U CN201922261657 U CN 201922261657U CN 212304708 U CN212304708 U CN 212304708U
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Abstract
The utility model provides a cross regional integration relay protection acquisition end power supply system, power supply system includes: the power supply system comprises an alternating current power supply unit, a direct current power supply unit and a switching control unit, wherein the input end of the alternating current power supply unit is connected with a power transmission line, the output end of the alternating current power supply unit is connected with the input end of the switching control unit, the direct current power supply unit adopts a storage battery for power supply, the output end of the direct current power supply unit is connected with the input end of the switching control unit, and the output end of the switching control unit is the output end of the power supply system. The adoption of the double-current power supply mode for the acquisition unit ensures that the acquisition unit is continuously supplied with power without interruption, and can also normally acquire power data even when power failure is detected and repaired, thereby ensuring the reliability of cross-region integrated relay protection.
Description
Technical Field
The utility model relates to an electric power relay protection field especially relates to a cross regional integration relay protection and gather end power supply system.
Background
When a power system fails, a relay protection device is required to execute relay protection action, and the precondition for the correct action of the relay protection device of the power system is that electric quantity characteristics such as analog quantity and switching quantity which reflect the fault characteristics of the power system can be quickly and accurately received. In order to improve the reliability of the relay protection device for sampling the characteristics of the electric quantity, a series of measures are taken for designing the relay protection equipment of the power system, such as adopting a three-out-of-two tripping outlet mode to prevent the protection device from misoperation, adopting a double-CPU module serial mode to prevent the protection device from being mistakenly opened when a processor fails, setting a double-relay serial loop to prevent a tripping contact from being closed due to the mistaken excitation of a relay, adopting double-AD sampling to prevent the protection device from being refused or mistakenly operated due to the sampling abnormity of a single loop, introducing sampling value abnormity detection to timely find out the corresponding protection of abnormal locking of the sampling link, and the. However, with the deep development of computer technology and network technology, the monitoring, measurement, control and protection of the relay protection of the power system are realized by real-time monitoring and on-line setting calculation, but the existing relay protection has low reliability and is easy to malfunction and refuse to operate.
Therefore, a trans-regional integrated power supply system with high reliability for the relay protection acquisition end and capable of online real-time monitoring and setting calculation is needed.
SUMMERY OF THE UTILITY MODEL
In view of this, the invention provides a power supply system for a cross-region integrated relay protection acquisition end, which is used for solving the problem of poor reliability of a cross-region integrated relay protection device in the prior art.
The utility model provides a transregional integration relay protection gathers end power supply system, its characterized in that: the power supply system includes: the power supply system comprises an alternating current power supply unit, a direct current power supply unit and a switching control unit, wherein the input end of the alternating current power supply unit is connected with a power transmission line, the output end of the alternating current power supply unit is connected with the input end of the switching control unit, the direct current power supply unit adopts a storage battery for power supply, the output end of the direct current power supply unit is connected with the input end of the switching control unit, and the output end of the switching control unit is the output end of the power supply system;
the power supply system also comprises a voltage-stabilizing output unit, wherein the input end of the voltage-stabilizing output unit is connected with the output end of the alternating current power supply unit, and the output end of the voltage-stabilizing output unit is connected with the input end of the switching control unit;
the power supply system further comprises an overcurrent self-locking unit, the input end of the overcurrent self-locking unit is connected with the output end of the switching control unit, and the output end of the overcurrent self-locking unit is the output end of the power supply system.
Further, the switching control unit comprises a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, an operational amplifier U2 and a MOS transistor Q4, one end of the resistor R3 is connected with the output end of the ac power supply unit, the other end of the resistor R3 is the output end of the power supply unit, one end of the resistor R6 is connected with a common connection point of the resistor R3 and the ac power supply unit, the other end of the resistor R6 is grounded via a resistor R7, one end of the resistor R4 is connected with a common connection point of the resistor R3 and the output end, the other end of the resistor R4 is connected with an inverting end of the operational amplifier U2, the non-inverting end of the operational amplifier U2 is connected with a common connection point of the resistor R6 and the resistor R6, one end of the resistor R6 is connected with a common connection point of the inverting end of the resistor R6 and the inverting end of the operational amplifier U6, the other end of the resistor R6 is connected with the gate of the output end of the, the source electrode of the MOS transistor Q4 is connected with the output end of the direct current power supply unit, and the drain electrode of the MOS transistor Q4 is connected with the common connection point of the resistor R3 and the output end;
the MOS transistor Q4 is a P-channel enhancement type MOS transistor.
Further, the alternating current power supply unit includes current transformer, full-bridge rectifier circuit, filter circuit and protection unit, current transformer's input is connected with the power transmission line, current transformer's output with the input of full-bridge rectifier is connected, the output of full-bridge rectifier with filter circuit's input is connected, the protection unit includes transient suppression diode and voltage follower, transient suppression diode with the input of full-bridge rectifier is parallelly connected, the voltage follower is operational amplifier U1, operational amplifier U1's homophase end with filter circuit's output is connected, operational amplifier U1's inverting terminal is connected with the output, operational amplifier U1's output with the input of switching control unit is connected.
Further, the voltage stabilizing output unit comprises a piezoresistor RV, a resistor R2, a resistor R10, a voltage stabilizing diode DW1, a MOS tube Q1 and a MOS tube Q2, one end of the piezoresistor RV is connected with the output end of the alternating current power supply unit, the other end of the piezoresistor RV is grounded through a resistor R10, one end of a resistor R2 is connected with the output end of the alternating current power supply unit, the other end of a resistor R2 is connected with the source of a MOS tube Q2, the gate of the MOS tube Q2 is connected with the common connection point of the piezoresistor RV and the resistor R10, the drain of the MOS tube Q1 is connected with the output end of the alternating current power supply unit, the source of the MOS tube Q1 is connected with one end of a resistor R3, the gate of the MOS tube Q1 is connected with the drain of the MOS tube Q2, the cathode of the voltage stabilizing diode DW1 is connected with the common connection point of the drain of the MOS tube Q2 and the gate of the;
the MOS transistor Q1 is an N-channel enhancement type MOS transistor, and the MOS transistor Q2 is a P-channel enhancement type MOS transistor.
Further, the overcurrent self-locking unit comprises a resistor R8, a resistor R9, a comparator U3 and a MOS tube Q3, one end of the resistor R8 is connected with a common connection point of the drains of the resistor R3 and the MOS tube Q4, the other end of the resistor R8 is grounded through the resistor R9, the same-phase end of the comparator U3 is connected with a common connection point of the resistor R8 and the resistor R9, the reverse-phase end of the comparator U3 is connected with a reference voltage REF, the source of the MOS tube Q4 is connected with a common connection point of the resistor R3 and the drain of the MOS tube Q4, the drain of the MOS tube Q3 is connected, and the gate of the MOS tube Q3 is connected with the output end of the comparator U3;
the MOS transistor Q3 is a P-channel enhancement type MOS transistor.
Furthermore, the system also comprises a charging unit, wherein the input end of the charging unit is connected with the output end of the voltage-stabilizing output unit, and the output end of the charging unit is connected with the direct-current power supply unit.
Further, the charging unit comprises a MOS transistor Q5, a resistor R11 and a comparator U4; the source electrode of the MOS tube Q5 is connected with the output end of the voltage-stabilizing output unit, the drain electrode of the MOS tube Q5 is connected with the charging end of the storage battery through a resistor R11, the in-phase end of the comparator U4 is connected with the storage battery, the inverting end of the comparator U4 is connected with a reference voltage REF1, and the output end of the comparator U4 is connected with the gate electrode of the MOS tube Q5;
the MOS transistor Q5 is a P-channel enhancement type MOS transistor.
The utility model has the advantages of: the adoption of the double-current power supply mode for the acquisition unit ensures that the acquisition unit is continuously supplied with power without interruption, and can also normally acquire power data even when power failure is detected and repaired, thereby ensuring the reliability of cross-region integrated relay protection.
Drawings
The invention will be further described with reference to the following figures and examples:
fig. 1 is a block diagram of the power supply structure of the present invention.
Fig. 2 is a schematic diagram of a power circuit of the present invention.
Detailed Description
The invention is further explained by the following combined with the attached drawings of the specification:
the utility model provides a pair of transregional integration relay protection gathers end power supply system, its characterized in that: as shown in fig. 1, the power supply system includes: the power supply system comprises an alternating current power supply unit, a direct current power supply unit and a switching control unit, wherein the input end of the alternating current power supply unit is connected with a power transmission line, the output end of the alternating current power supply unit is connected with the input end of the switching control unit, the direct current power supply unit adopts a storage battery for power supply, the output end of the direct current power supply unit is connected with the input end of the switching control unit, and the output end of the switching control unit is the output end of the power supply system;
the power supply system also comprises a voltage-stabilizing output unit, wherein the input end of the voltage-stabilizing output unit is connected with the output end of the alternating current power supply unit, and the output end of the voltage-stabilizing output unit is connected with the input end of the switching control unit;
the power supply system further comprises an overcurrent self-locking unit, the input end of the overcurrent self-locking unit is connected with the output end of the switching control unit, and the output end of the overcurrent self-locking unit is the output end of the power supply system.
The double-current power supply ensures that the acquisition unit continuously supplies power without interruption, and can also normally acquire power data even when power failure is detected and repaired, thereby ensuring the reliability of cross-region integrated relay protection.
As shown in fig. 2, the switching control unit includes a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, an operational amplifier U2 and a MOS transistor Q4, one end of the resistor R3 is connected to the output terminal of the ac power supply unit, the other end of the resistor R3 is the output terminal of the power supply unit, one end of the resistor R6 is connected to a common connection point of a resistor R3 and the ac power supply unit, the other end of the resistor R6 is grounded via a resistor R7, one end of the resistor R4 is connected to a common connection point of a resistor R3 and the output terminal, the other end of the resistor R4 is connected to an inverting terminal of the operational amplifier U2, the non-inverting terminal of the operational amplifier U2 is connected to a common connection point of a resistor R6 and a resistor R6, one end of the resistor R6 is connected to a common connection point of the inverting terminals of a resistor R6 and the output terminal of the operational amplifier U6, the operational amplifier U6 is connected to a gate of the MOS transistor Q36, the source electrode of the MOS transistor Q4 is connected with the output end of the direct current power supply unit, and the drain electrode of the MOS transistor Q4 is connected with the common connection point of the resistor R3 and the output end;
the MOS transistor Q4 is a P-channel enhancement type MOS transistor.
The power supply mode is double power supply, alternating current power supply is preferred, and when the alternating current power supply fails, a storage battery is adopted for supplying power; the alternating current power supply adopts a current transformer to induce current from a power transmission line, and the current is rectified through a full bridge, filtered through an RC and then output through a voltage follower of an operational amplifier U1;
when the alternating current is normally supplied, current flows through two ends of the resistor R3, the voltage output by the operational amplifier U2 is the voltage drop of two ends of the resistor R3, and through the resistance design of the resistor R3, the MOS transistor Q4 is cut off, namely, the alternating current supplies power to the outside;
when the alternating current is abnormally supplied, no current flows through the two ends of the resistor R3, at the moment, the operational amplifier U2 does not output voltage zero, at the moment, the source voltage of the MOS transistor Q4 is greater than the grid voltage, the MOS transistor Q4 is conducted, and the storage battery supplies power to the outside;
therefore, dual power supplies are realized, and the reliability of data acquisition is ensured.
The alternating current power supply unit comprises a current transformer, a full-bridge rectification circuit, a filter circuit and a protection unit, wherein the input end of the current transformer is connected with a power transmission line, the output end of the current transformer is connected with the input end of the full-bridge rectification, the output end of the full-bridge rectification is connected with the input end of the filter circuit, the protection unit comprises a transient suppression diode and a voltage follower, the transient suppression diode is connected with the input end of the full-bridge rectification in parallel, the voltage follower is operational amplifier U1, the in-phase end of the operational amplifier U1 is connected with the output end of the filter circuit, the inverting end of the operational amplifier U1 is connected with the output end, and the output end of the operational amplifier U1 is connected with the input end of the switching control unit. As shown in fig. 2, the full-bridge rectification adopts an existing diode full-bridge rectification circuit, the filter circuit adopts RC filtering, a resistor R1 and a capacitor C1, one end of the resistor R1 is connected with the positive output end of the full-bridge rectification ZL1, and the other end of the resistor R1 is grounded through a capacitor C1.
The power supply also comprises a voltage-stabilizing output unit, wherein the input end of the voltage-stabilizing output unit is connected with the output end of the alternating current power supply unit, and the output end of the voltage-stabilizing output unit is connected with the input end of the switching control unit;
the voltage stabilizing output unit comprises a piezoresistor RV, a resistor R2, a resistor R10, a voltage stabilizing diode DW1, an MOS tube Q1 and an MOS tube Q2, one end of the piezoresistor RV is connected with the output end of the alternating current power supply unit, the other end of the piezoresistor RV is grounded through a resistor R10, one end of a resistor R2 is connected with the output end of the alternating current power supply unit, the other end of the resistor R2 is connected with the source electrode of the MOS tube Q2, the grid electrode of the MOS tube Q2 is connected with the common connection point of the piezoresistor RV and the resistor R10, the drain electrode of the MOS tube Q1 is connected with the output end of the alternating current power supply unit, the source electrode of the MOS tube Q1 is connected with one end of the resistor R3, the grid electrode of the MOS tube Q1 is connected with the drain electrode of the MOS tube Q2, the cathode of the voltage stabilizing diode DW1 is connected with the common connection point of the drain electrode;
the MOS transistor Q1 is an N-channel enhancement type MOS transistor, and the MOS transistor Q2 is a P-channel enhancement type MOS transistor.
The working principle is as follows:
when the voltage is less than or equal to the rated voltage, no current flows through the piezoresistor, namely no voltage exists on the grid of the MOS tube Q2, the source voltage A point of the MOS tube Q2 is connected with the grid voltage, the MOS tube Q2 is connected, the MOS tube Q1 is connected, the grid of the MOS tube Q1 is constant through the voltage stabilizing diode DW1, and according to the characteristics of the MOS tube, when the grid voltage of the MOS tube is stable, the output current is constant, namely the output voltage is constant;
if the input voltage is higher than the preset voltage, the resistance value of the voltage dependent resistor drops suddenly, the resistance value of the voltage dependent resistor is close to zero, the grid voltage of the MOS transistor Q2 is equal to the voltage at the two ends of the resistor R10, the source voltage of the MOS transistor Q2 is lower than the grid voltage of the MOS transistor Q2, the MOS transistor Q2 is cut off, and the MOS transistor Q1 is cut off, so that the outward output is stopped, and a subsequent circuit is protected.
The power supply also comprises an overcurrent self-locking unit, the input end of the overcurrent self-locking unit is connected with the output end of the switching control unit, and the output end of the overcurrent self-locking unit is the output end of the power supply;
the overcurrent self-locking unit comprises a resistor R8, a resistor R9, a comparator U3 and a MOS tube Q3, one end of the resistor R8 is connected with a common connection point of the drains of the resistor R3 and the MOS tube Q4, the other end of the resistor R8 is grounded through the resistor R9, the same-phase end of the comparator U3 is connected with a common connection point of the resistor R8 and the resistor R9, the reverse-phase end of the comparator U3 is connected with a reference voltage REF, the source of the MOS tube Q4 is connected with a common connection point of the resistor R3 and the drain of the MOS tube Q4, the drain of the MOS tube Q3 is connected, and the gate of the MOS tube Q3 is connected with the output end of the comparator U3;
the MOS transistor Q3 is a P-channel enhancement type MOS transistor.
The working principle is as follows:
by comparing the voltage at two ends of the resistor R9 for collecting current with a preset reference voltage, when the voltage at two ends of the resistor R9 is larger than the preset reference voltage, namely the output current of the power supply is higher than the preset current, the comparator U3 outputs a high level, and the MOS transistor Q3 is cut off, so that the connection with a subsequent circuit is disconnected, and the situation that a large current flows into subsequent equipment to cause irreversible damage is avoided; when the voltage at the two ends of the resistor R9 is not greater than the preset reference voltage, namely the current output by the power supply is normal, the comparator U3 outputs low level, the MOS transistor Q3 is conducted, and the current is output to supply power for subsequent circuits; by the technical scheme, the overcurrent automatic disconnection and the connection of the subsequent circuit can be realized, so that the subsequent circuit is protected.
The system further comprises a charging unit, wherein the input end of the charging unit is connected with the output end of the voltage-stabilizing output unit, and the output end of the charging unit is connected with the direct-current power supply unit.
The charging unit comprises a MOS transistor Q5, a resistor R11 and a comparator U4; the source electrode of the MOS tube Q5 is connected with the output end of the voltage-stabilizing output unit, the drain electrode of the MOS tube Q5 is connected with the charging end of the storage battery through a resistor R11, the in-phase end of the comparator U4 is connected with the storage battery, the inverting end of the comparator U4 is connected with a reference voltage REF1, and the output end of the comparator U4 is connected with the gate electrode of the MOS tube Q5;
the MOS transistor Q5 is a P-channel enhancement type MOS transistor.
The working principle is as follows:
when the current of the alternating current unit is output outwards, the storage battery is charged through the MOS tube Q5 and the resistor R11, the voltage after the charger is fully charged is higher than the reference voltage REF1 through the setting of the reference voltage REF1, and when the storage battery is charged, the grid voltage of the MOS tube Q5 is at a high level, the MOS tube Q5 is cut off, so that the storage battery is stopped being charged; after the storage battery is used, namely the voltage of the storage battery is lower than the preset voltage, the storage battery is charged by the alternating current, and the cycle is repeated, so that the charging of the storage battery is realized.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (7)
1. The utility model provides a cross regional integration relay protection collection end power supply system which characterized in that: the power supply system includes: the power supply system comprises an alternating current power supply unit, a direct current power supply unit and a switching control unit, wherein the input end of the alternating current power supply unit is connected with a power transmission line, the output end of the alternating current power supply unit is connected with the input end of the switching control unit, the direct current power supply unit adopts a storage battery for power supply, the output end of the direct current power supply unit is connected with the input end of the switching control unit, and the output end of the switching control unit is the output end of the power supply system;
the power supply system also comprises a voltage-stabilizing output unit, wherein the input end of the voltage-stabilizing output unit is connected with the output end of the alternating current power supply unit, and the output end of the voltage-stabilizing output unit is connected with the input end of the switching control unit;
the power supply system further comprises an overcurrent self-locking unit, the input end of the overcurrent self-locking unit is connected with the output end of the switching control unit, and the output end of the overcurrent self-locking unit is the output end of the power supply system.
2. The cross-regional integrated relay protection acquisition terminal power supply system according to claim 1, characterized in that: the switching control unit comprises a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, an operational amplifier U2 and a MOS transistor Q4, wherein one end of the resistor R3 is connected with the output end of the alternating current power supply unit, the other end of the resistor R3 is the output end of the power supply unit, one end of a resistor R6 is connected with a common connection point of a resistor R3 and the alternating current power supply unit, the other end of the resistor R6 is grounded through a resistor R7, one end of a resistor R4 is connected with a common connection point of a resistor R3 and the output end, the other end of the resistor R4 is connected with an inverting end of an operational amplifier U2, the same-phase end of an operational amplifier U2 is connected with a common connection point of a resistor R6 and a resistor R6, one end of the resistor R6 is connected with a common connection point of the inverting end of the resistor R6 and the inverting end of the operational amplifier U6, the other end of the resistor R6 is connected with the output end of, the source electrode of the MOS transistor Q4 is connected with the output end of the direct current power supply unit, and the drain electrode of the MOS transistor Q4 is connected with the common connection point of the resistor R3 and the output end;
the MOS transistor Q4 is a P-channel enhancement type MOS transistor.
3. The cross-regional integrated relay protection acquisition terminal power supply system according to claim 1, characterized in that: the alternating current power supply unit comprises a current transformer, a full-bridge rectification circuit, a filter circuit and a protection unit, wherein the input end of the current transformer is connected with a power transmission line, the output end of the current transformer is connected with the input end of the full-bridge rectification, the output end of the full-bridge rectification is connected with the input end of the filter circuit, the protection unit comprises a transient suppression diode and a voltage follower, the transient suppression diode is connected with the input end of the full-bridge rectification in parallel, the voltage follower is operational amplifier U1, the in-phase end of the operational amplifier U1 is connected with the output end of the filter circuit, the inverting end of the operational amplifier U1 is connected with the output end, and the output end of the operational amplifier U1 is connected with the input end of the switching control unit.
4. The cross-regional integrated relay protection acquisition terminal power supply system according to claim 1, characterized in that: the voltage stabilizing output unit comprises a piezoresistor RV, a resistor R2, a resistor R10, a voltage stabilizing diode DW1, an MOS tube Q1 and an MOS tube Q2, one end of the piezoresistor RV is connected with the output end of the alternating current power supply unit, the other end of the piezoresistor RV is grounded through a resistor R10, one end of a resistor R2 is connected with the output end of the alternating current power supply unit, the other end of the resistor R2 is connected with the source electrode of the MOS tube Q2, the grid electrode of the MOS tube Q2 is connected with the common connection point of the piezoresistor RV and the resistor R10, the drain electrode of the MOS tube Q1 is connected with the output end of the alternating current power supply unit, the source electrode of the MOS tube Q1 is connected with one end of the resistor R3, the grid electrode of the MOS tube Q1 is connected with the drain electrode of the MOS tube Q2, the cathode of the voltage stabilizing diode DW1 is connected with the common connection point of the drain electrode;
the MOS transistor Q1 is an N-channel enhancement type MOS transistor, and the MOS transistor Q2 is a P-channel enhancement type MOS transistor.
5. The cross-regional integrated relay protection acquisition terminal power supply system according to claim 1, characterized in that: the overcurrent self-locking unit comprises a resistor R8, a resistor R9, a comparator U3 and a MOS tube Q3, one end of the resistor R8 is connected with a common connection point of the drains of the resistor R3 and the MOS tube Q4, the other end of the resistor R8 is grounded through the resistor R9, the same-phase end of the comparator U3 is connected with a common connection point of the resistor R8 and the resistor R9, the reverse-phase end of the comparator U3 is connected with a reference voltage REF, the source of the MOS tube Q4 is connected with a common connection point of the resistor R3 and the drain of the MOS tube Q4, the drain of the MOS tube Q3 is connected, and the gate of the MOS tube Q3 is connected with the output end of the comparator U3;
the MOS transistor Q3 is a P-channel enhancement type MOS transistor.
6. The cross-regional integrated relay protection acquisition end power supply system according to claim 4, characterized in that: the system further comprises a charging unit, wherein the input end of the charging unit is connected with the output end of the voltage-stabilizing output unit, and the output end of the charging unit is connected with the direct-current power supply unit.
7. The cross-regional integrated relay protection acquisition end power supply system according to claim 6, characterized in that: the charging unit comprises a MOS transistor Q5, a resistor R11 and a comparator U4; the source electrode of the MOS tube Q5 is connected with the output end of the voltage-stabilizing output unit, the drain electrode of the MOS tube Q5 is connected with the charging end of the storage battery through a resistor R11, the in-phase end of the comparator U4 is connected with the storage battery, the inverting end of the comparator U4 is connected with a reference voltage REF1, and the output end of the comparator U4 is connected with the gate electrode of the MOS tube Q5;
the MOS transistor Q5 is a P-channel enhancement type MOS transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922261657.4U CN212304708U (en) | 2019-12-13 | 2019-12-13 | Cross-region integrated power supply system for relay protection acquisition terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922261657.4U CN212304708U (en) | 2019-12-13 | 2019-12-13 | Cross-region integrated power supply system for relay protection acquisition terminal |
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| Publication Number | Publication Date |
|---|---|
| CN212304708U true CN212304708U (en) | 2021-01-05 |
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| CN201922261657.4U Active CN212304708U (en) | 2019-12-13 | 2019-12-13 | Cross-region integrated power supply system for relay protection acquisition terminal |
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