CN211478632U - Circuit for preventing communication with primary equipment during calibration of transformer substation protection measurement and control device - Google Patents
Circuit for preventing communication with primary equipment during calibration of transformer substation protection measurement and control device Download PDFInfo
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- CN211478632U CN211478632U CN201922121863.5U CN201922121863U CN211478632U CN 211478632 U CN211478632 U CN 211478632U CN 201922121863 U CN201922121863 U CN 201922121863U CN 211478632 U CN211478632 U CN 211478632U
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Abstract
The application provides a circuit that communicates with primary equipment when preventing transformer substation's protection measurement and control device check-up, its characterized in that: the on-off control circuit is used for receiving the charged information of the target circuit and realizing the on-off of the circuit according to the information. The circuit provided by the application can automatically detect the electrification condition of the voltage terminal row of the transformer substation protection measurement and control device, and when the electrification condition of the voltage terminal row is detected, the connection between the output end of the relay protection tester and the voltage terminal row of the transformer substation protection measurement and control device is disconnected, so that the voltage of the relay protection tester cannot be transmitted to the secondary side of the bus voltage transformer; the circuit that this application provided can effectively avoid because of the security risk that personnel misoperation brought for the electric wire netting.
Description
Technical Field
The utility model relates to a detect the control circuit field, especially relate to a circuit that communicates with primary equipment when preventing transformer substation's protection measurement and control device check-up.
Background
The relay protection tester is applied to the verification work of a transformer substation protection measurement and control device, and outputs analog voltage and current for verifying the reliability of the protection device in the verification process of the protection measurement and control device. In the process of verifying the protection, measurement and control device of the transformer substation, due to uncertain factors of technical level and mental state of operators, misoperation may exist, and potential hazards are brought to safe operation of transformer substation equipment. When the protection measurement and control device is checked, the voltage input end of the protection measurement and control device is disconnected with the secondary side of the bus voltage transformer by cutting the voltage terminal row connecting piece. When a single-interval protection measurement and control device is usually checked, the secondary side of a bus PT is electrified, and in the checking process of the protection measurement and control device, if a worker has an operation error, a voltage output terminal of a relay protection tester is connected to the electrified side of a voltage terminal row by mistake, a voltage transformer on the secondary side of the bus is likely to be disconnected and tripped, and the protection device which normally operates is subjected to voltage loss and misoperation.
Therefore, a circuit for preventing the substation protection measurement and control device from being communicated with the primary equipment during verification is needed.
SUMMERY OF THE UTILITY MODEL
In view of this, the present application provides a circuit capable of automatically detecting an electrified condition of a voltage terminal row of a substation protection measurement and control device, and when detecting that the voltage terminal row is electrified, disconnecting an output terminal of a relay protection tester from the voltage terminal row of the substation protection measurement and control device, so that a voltage of the relay protection tester cannot be transmitted to a secondary side of a bus voltage transformer, which prevents primary equipment from being connected during verification of the substation protection measurement and control device.
The application provides a circuit that communicates with primary equipment when preventing transformer substation's protection measurement and control device check-up, its characterized in that: comprises a detection circuit and an on-off control circuit;
the detection circuit comprises a first detection circuit and a second detection circuit, the first detection circuit is used for detecting whether the output end of the relay protection tester is electrified or not and transmitting information of whether the output end of the tester is electrified or not to the on-off control circuit, and the second detection circuit is used for detecting whether a voltage terminal strip of the transformer substation protection measurement and control device is electrified or not and transmitting information of whether the voltage terminal strip is electrified or not to the on-off control circuit;
and the on-off control circuit is used for receiving the information of the first detection circuit and the second detection circuit and realizing the connection or disconnection between the relay protection tester and the transformer substation protection measurement and control device according to the information, thereby preventing the transformer substation protection measurement and control device from being checked in an electrified way.
Further, the first detection circuit comprises a transformer T1, a transformer T2, a transformer T3, a three-phase rectifier bridge D1, a resistor R1, a capacitor C1 and an optocoupler G1;
one end of the primary side of a transformer T1 is electrically connected with the phase A of the output end of the relay protection tester, the other end of the primary side of a transformer T1 is grounded, one end of the secondary side of a transformer T1 is connected with the phase A input end of a three-phase rectifier bridge D1, one end of the primary side of a transformer T2 is electrically connected with the phase B of the output end of the relay protection tester, the other end of the primary side of a transformer T2 is grounded, one end of the secondary side of a transformer T2 is connected with the phase B input end of the three-phase rectifier bridge D1, one end of the primary side of a transformer T3 is electrically connected with the phase C of the output end of the relay protection tester, the other end of the primary side of a transformer T3 is grounded, one end of the secondary side of a transformer T3 is connected with the phase C input end of the three-phase rectifier bridge D1, the other end of the, the positive output end of the rectifier bridge D1 is connected with one end of a capacitor C1, the other end of the capacitor C1 is grounded, one end of a resistor R1 is connected with a common connection point of the capacitor C1 and the rectifier bridge D1, the other end of a resistor R1 is connected with the anode of a light-emitting diode of the optocoupler G1, the cathode of the light-emitting diode of the optocoupler G1 is grounded, the collector of a triode of the optocoupler G1 is connected with a direct-current power supply, and the emitter of the triode of the optocoupler G1 is grounded.
Further, the second detection circuit comprises a transformer T4, a transformer T5, a transformer T6, a three-phase rectifier bridge D2, a resistor R2, a capacitor C2 and an optocoupler G2;
one end of the primary side of a transformer T4 is electrically connected to the phase A of the output end of the voltage terminal row of the substation protection and control device, the other end of the primary side of a transformer T4 is grounded, one end of the secondary side of a transformer T4 is connected to the phase A input end of a three-phase rectifier bridge D2, one end of the primary side of a transformer T5 is electrically connected to the phase B of the output end of the voltage terminal row of the substation protection and control device, the other end of the primary side of a transformer T5 is grounded, one end of the secondary side of a transformer T5 is connected to the phase B input end of the three-phase rectifier bridge D2, one end of the primary side of a transformer T6 is electrically connected to the phase C of the output end of the voltage terminal row of the substation protection and control device, the other end of the primary side of a transformer T6 is grounded, one end of the secondary side of a transformer T6 is connected to the phase C input end of the three-phase rectifier bridge, the positive output end of the three-phase rectifier bridge D2 is connected with one end of a capacitor C2, the other end of the capacitor C2 is grounded, one end of a resistor R2 is connected with a common connection point of the capacitor C2 and the three-phase rectifier bridge D2, the other end of the resistor R2 is connected with the anode of a light-emitting diode of the optocoupler G2, the cathode of the light-emitting diode of the optocoupler G2 is grounded, the collector of a triode of the optocoupler G2 is connected with a direct-current power supply, and the emitter of the triode of the optocoupler G2 is grounded.
Further, the on-off control circuit comprises a relay KA1, a relay KA2, a relay KA3 and a relay KA 4;
one end of a normally open contact of the relay KA2 is connected with one end of a normally closed contact of the relay KA3 in series, the other end of the normally open contact of the relay KA2 is connected with a direct current power supply, one end of a coil of the relay KA2 is connected with a direct current power supply, the other end of the coil of the relay KA2 is connected with a collector electrode of a triode of an optocoupler G1 of the first detection circuit, one end of a coil of the relay KA3 is connected with the direct current power supply, the other end of the coil of the relay KA3 is connected with a collector electrode of a triode of an optocoupler G2 of the second detection circuit, one end of a coil of the relay KA1 is connected with the other end of the normally closed contact of the relay KA3, the other end of the coil of the relay KA1 is grounded, two ends of the normally open contact of the relay KA1 are respectively connected with an output end of a relay protection tester and a, one end of a normally closed contact of the relay KA4 is connected with a voltage terminal row of the transformer substation protection measurement and control device, and the other end of the normally closed contact of the relay KA4 is connected with primary side non-grounding ends of the transformer T4, the transformer T5 and the transformer T6.
Further, the circuit also comprises an alarm circuit A1 for sending out warning information when the voltage terminal strip of the transformer substation protection measurement and control device is electrified, wherein the alarm circuit A1 is connected with a coil of the relay KA3 in parallel.
Further, the alarm circuit a1 includes an audible and visual alarm.
The utility model has the advantages of: the circuit provided by the application can automatically detect whether the voltage terminal strip of the transformer substation protection measurement and control device is electrified, and when the voltage terminal strip is detected to be electrified, the connection between the output end of the relay protection tester and the voltage terminal strip of the transformer substation protection measurement and control device is disconnected, so that the voltage output by the relay protection tester cannot be transmitted to the secondary side of the bus voltage transformer; the circuit that this application provided can effectively avoid because of the security risk that personnel misoperation brought for the electric wire netting.
Drawings
The invention will be further described with reference to the following figures and examples:
fig. 1 is a circuit block diagram of the present invention.
Fig. 2 is a schematic diagram of a first detection circuit according to the present invention.
Fig. 3 is a schematic diagram of a second detection circuit and an alarm circuit a1 according to the present invention.
Fig. 4 is a schematic diagram of the on-off control 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 circuit that communicates with primary equipment when preventing transformer substation's protection measurement and control device calibration, its characterized in that: comprises a detection circuit and an on-off control circuit;
the detection circuit comprises a first detection circuit and a second detection circuit, the first detection circuit is used for detecting whether the output end of the relay protection tester is electrified or not and transmitting information of whether the output end of the tester is electrified or not to the on-off control circuit, and the second detection circuit is used for detecting whether a voltage terminal strip of the transformer substation protection measurement and control device is electrified or not and transmitting information of whether the voltage terminal strip is electrified or not to the on-off control circuit;
and the on-off control circuit is used for receiving the information of the first detection circuit and the second detection circuit and realizing the connection or disconnection between the relay protection tester and the transformer substation protection measurement and control device according to the information, thereby preventing the transformer substation protection measurement and control device from being checked in an electrified way. In this embodiment, the primary device is a bus transformer.
According to the technical scheme, the electrified detection circuit of the relay protection measurement and control screen voltage terminal row with the automatic on-off function can automatically detect the electrified state of the protection measurement and control screen voltage terminal row when the protection measurement and control device is checked, and can automatically disconnect the connection between the relay protection tester and the voltage terminal row and give an alarm when the voltage terminal row is electrified, so that the misoperation of the protection device caused by the misoperation of workers can be effectively avoided, and the safety of a power grid is improved.
In the present embodiment, it is preferred that,
the first detection circuit comprises a transformer T1, a transformer T2, a transformer T3, a three-phase rectifier bridge D1, a resistor R1, a capacitor C1 and an optical coupler G1;
one end of the primary side of a transformer T1 is electrically connected with the phase A of the output end of the relay protection tester, the other end of the primary side of a transformer T1 is grounded, one end of the secondary side of a transformer T1 is connected with the phase A input end of a three-phase rectifier bridge D1, one end of the primary side of a transformer T2 is electrically connected with the phase B of the output end of the relay protection tester, the other end of the primary side of a transformer T2 is grounded, one end of the secondary side of a transformer T2 is connected with the phase B input end of the three-phase rectifier bridge D1, one end of the primary side of a transformer T3 is electrically connected with the phase C of the output end of the relay protection tester, the other end of the primary side of a transformer T3 is grounded, one end of the secondary side of a transformer T3 is connected with the phase C input end of the three-phase rectifier bridge D1, the other end of the, the positive output end of the rectifier bridge D1 is connected with one end of a capacitor C1, the other end of the capacitor C1 is grounded, one end of a resistor R1 is connected with a common connection point of the capacitor C1 and the rectifier bridge D1, the other end of a resistor R1 is connected with the anode of a light-emitting diode of the optocoupler G1, the cathode of the light-emitting diode of the optocoupler G1 is grounded, the collector of a triode of the optocoupler G1 is connected with a direct-current power supply, and the emitter of the triode of the optocoupler G1 is grounded.
Through the technical scheme, when one or more of three phases of the voltage output terminal A, B, C of the relay protection tester are electrified, the voltage is reduced through the transformer T1, the transformer T2 or the transformer T3, the alternating current is converted into the direct current through the three-phase rectifier bridge D1, and the direct current is electrified and conducted through the resistor R1 and the optical coupler G1; otherwise, the optical coupler G1 is cut off.
In the embodiment, the second detection circuit comprises a transformer T4, a transformer T5, a transformer T6, a three-phase rectifier bridge D2, a resistor R2, a capacitor C2 and an optocoupler G2;
one end of the primary side of a transformer T4 is electrically connected to the phase A of the output end of the voltage terminal row of the substation protection and control device, the other end of the primary side of a transformer T4 is grounded, one end of the secondary side of a transformer T4 is connected to the phase A input end of a three-phase rectifier bridge D2, one end of the primary side of a transformer T5 is electrically connected to the phase B of the output end of the voltage terminal row of the substation protection and control device, the other end of the primary side of a transformer T5 is grounded, one end of the secondary side of a transformer T5 is connected to the phase B input end of the three-phase rectifier bridge D2, one end of the primary side of a transformer T6 is electrically connected to the phase C of the output end of the voltage terminal row of the substation protection and control device, the other end of the primary side of a transformer T6 is grounded, one end of the secondary side of a transformer T6 is connected to the phase C input end of the three-phase rectifier bridge, the positive output end of the three-phase rectifier bridge D2 is connected with one end of a capacitor C2, the other end of the capacitor C2 is grounded, one end of a resistor R2 is connected with a common connection point of the capacitor C2 and the three-phase rectifier bridge D2, the other end of the resistor R2 is connected with the anode of a light-emitting diode of the optocoupler G2, the cathode of the light-emitting diode of the optocoupler G2 is grounded, the collector of a triode of the optocoupler G2 is connected with a direct-current power supply, and the emitter of the triode of the optocoupler G2 is grounded.
According to the technical scheme, when one or more phases of the voltage terminal row A, B, C of the transformer substation protection measurement and control device are electrified, the voltage is reduced through the transformer T4, the transformer T5 or the transformer T6, the alternating current is converted into the direct current through the three-phase rectifier bridge D2, and the direct current is electrified and conducted through the resistor R2 and the optical coupler G2; otherwise, the optical coupler G2 is cut off.
The three-phase rectifier bridges D1 and D2 both use the existing full-bridge rectifier circuit, and are not described herein again.
In the embodiment, the on-off control circuit comprises a relay KA1, a relay KA2, a relay KA3 and a relay KA 4;
one end of a normally open contact of the relay KA2 is connected with one end of a normally closed contact of the relay KA3 in series, the other end of the normally open contact of the relay KA2 is connected with a direct current power supply, one end of a coil of the relay KA2 is connected with a direct current power supply, the other end of the coil of the relay KA2 is connected with a collector electrode of a triode of an optocoupler G1 of the first detection circuit, one end of a coil of the relay KA3 is connected with the direct current power supply, the other end of the coil of the relay KA3 is connected with a collector electrode of a triode of an optocoupler G2 of the second detection circuit, one end of a coil of the relay KA1 is connected with the other end of the normally closed contact of the relay KA3, the other end of the coil of the relay KA1 is grounded, two ends of the normally open contact of the relay KA1 are respectively connected with an output end of a relay protection tester and a, one end of a normally closed contact of the relay KA4 is connected with a voltage terminal row of the transformer substation protection measurement and control device, and the other end of the normally closed contact of the relay KA4 is connected with primary side non-grounding ends of the transformer T4, the transformer T5 and the transformer T6.
The working principle is as follows:
when the voltage terminal strip of the transformer substation protection measurement and control device is electrified, the optocoupler G2 is conducted, the coil of the relay KA3 is electrified, the normally closed contact of the relay KA3 is opened from the normally closed action, and the coil of the relay KA1 is not electrified, so that the voltage output terminal of the relay protection tester and the voltage terminal strip of the transformer substation protection measurement and control device are in a disconnected state, and the transformer substation protection measurement and control device is prevented from being communicated with primary equipment during verification;
when a voltage terminal row of the substation protection measurement and control device is not electrified, the optocoupler G2 is cut off, a coil of the relay KA3 cannot be electrified, and a normally closed contact of the relay KA3 does not act, namely the normally closed contact of the relay KA3 is in a closed state; meanwhile, when the voltage output terminal of the relay protection tester is electrified, the optocoupler G1 is conducted, the coil of the relay KA2 is electrified, the normally open contact of the relay KA2 acts, the normally open action is closed, and the coil of the relay KA1 is electrified, so that the voltage output terminal of the relay protection tester and the voltage terminal bar of the transformer substation protection measurement and control device are in a connection state, and primary equipment is ensured to be uncharged when the voltage terminal bar of the transformer substation protection measurement and control device is verified;
meanwhile, when the voltage output terminal of the relay protection tester is not electrified, the optocoupler G1 is cut off, the coil of the relay KA2 is not electrified, the normally open contact of the relay KA2 does not act, the normally open state is kept, and the coil of the relay KA1 is not electrified;
namely, when the voltage output terminal of the relay protection tester is electrified and the voltage terminal row of the substation protection measurement and control device is not electrified, the coil of the relay KA1 is electrified, the normally open contact of the relay KA1 is closed, and therefore the calibration of the substation protection measurement and control device is started.
In this embodiment, the circuit further includes an alarm circuit a1, which is used for sending out warning information when the voltage terminal strip of the substation protection measurement and control device is electrified, and the alarm circuit a1 is connected in parallel with the coil of the relay KA 3. As shown in FIG. 3, the alarm is a conventional audible and visual alarm, and will not be described in detail herein. When opto-coupler G2 switched on, when transformer substation protection measurement and control device voltage terminal row was electrified promptly, the alarm got the electricity and sent audible and visual alarm for inform the present circuit live condition of staff, thereby realize the information transfer of staff and circuit.
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 (6)
1. The utility model provides a circuit that prevents that protection measurement and control device of transformer substation from communicateing with primary equipment during check-up which characterized in that: comprises a detection circuit and an on-off control circuit;
the detection circuit comprises a first detection circuit and a second detection circuit, the first detection circuit is used for detecting whether the output end of the relay protection tester is electrified or not and transmitting information of whether the output end of the tester is electrified or not to the on-off control circuit, and the second detection circuit is used for detecting whether a voltage terminal strip of the transformer substation protection measurement and control device is electrified or not and transmitting information of whether the voltage terminal strip is electrified or not to the on-off control circuit;
and the on-off control circuit is used for receiving the information of the first detection circuit and the second detection circuit and realizing the connection or disconnection between the relay protection tester and the transformer substation protection measurement and control device according to the information, thereby preventing the transformer substation protection measurement and control device from being checked in an electrified way.
2. The circuit for preventing the substation protection measurement and control device from being communicated with the primary equipment during verification according to claim 1, is characterized in that: the first detection circuit comprises a transformer T1, a transformer T2, a transformer T3, a three-phase rectifier bridge D1, a resistor R1, a capacitor C1 and an optical coupler G1;
one end of the primary side of a transformer T1 is electrically connected with the phase A of the output end of the relay protection tester, the other end of the primary side of a transformer T1 is grounded, one end of the secondary side of a transformer T1 is connected with the phase A input end of a three-phase rectifier bridge D1, one end of the primary side of a transformer T2 is electrically connected with the phase B of the output end of the relay protection tester, the other end of the primary side of a transformer T2 is grounded, one end of the secondary side of a transformer T2 is connected with the phase B input end of the three-phase rectifier bridge D1, one end of the primary side of a transformer T3 is electrically connected with the phase C of the output end of the relay protection tester, the other end of the primary side of a transformer T3 is grounded, one end of the secondary side of a transformer T3 is connected with the phase C input end of the three-phase rectifier bridge D1, the other end of the, the positive output end of the rectifier bridge D1 is connected with one end of a capacitor C1, the other end of the capacitor C1 is grounded, one end of a resistor R1 is connected with a common connection point of the capacitor C1 and the rectifier bridge D1, the other end of a resistor R1 is connected with the anode of a light-emitting diode of the optocoupler G1, the cathode of the light-emitting diode of the optocoupler G1 is grounded, the collector of a triode of the optocoupler G1 is connected with a direct-current power supply, and the emitter of the triode of the optocoupler G1 is grounded.
3. The circuit for preventing the substation protection measurement and control device from being communicated with the primary equipment during verification according to claim 1, is characterized in that: the second detection circuit comprises a transformer T4, a transformer T5, a transformer T6, a three-phase rectifier bridge D2, a resistor R2, a capacitor C2 and an optical coupler G2;
one end of the primary side of a transformer T4 is electrically connected to the phase A of the output end of the voltage terminal row of the substation protection and control device, the other end of the primary side of a transformer T4 is grounded, one end of the secondary side of a transformer T4 is connected to the phase A input end of a three-phase rectifier bridge D2, one end of the primary side of a transformer T5 is electrically connected to the phase B of the output end of the voltage terminal row of the substation protection and control device, the other end of the primary side of a transformer T5 is grounded, one end of the secondary side of a transformer T5 is connected to the phase B input end of the three-phase rectifier bridge D2, one end of the primary side of a transformer T6 is electrically connected to the phase C of the output end of the voltage terminal row of the substation protection and control device, the other end of the primary side of a transformer T6 is grounded, one end of the secondary side of a transformer T6 is connected to the phase C input end of the three-phase rectifier bridge, the positive output end of the three-phase rectifier bridge D2 is connected with one end of a capacitor C2, the other end of the capacitor C2 is grounded, one end of a resistor R2 is connected with a common connection point of the capacitor C2 and the three-phase rectifier bridge D2, the other end of the resistor R2 is connected with the anode of a light-emitting diode of the optocoupler G2, the cathode of the light-emitting diode of the optocoupler G2 is grounded, the collector of a triode of the optocoupler G2 is connected with a direct-current power supply, and the emitter of the triode of the optocoupler G2 is grounded.
4. The circuit for preventing the substation protection measurement and control device from being communicated with the primary equipment during verification according to claim 1, is characterized in that: the on-off control circuit comprises a relay KA1, a relay KA2, a relay KA3 and a relay KA 4;
one end of a normally open contact of the relay KA2 is connected in series with one end of a normally closed contact of the relay KA3, the other end of the normally open contact of the relay KA2 is connected with a direct current power supply, one end of a coil of the relay KA2 is connected with a direct current power supply, the other end of the coil of the relay KA2 is connected with a collector electrode of a triode of the optocoupler G1 of the first detection circuit, one end of a coil of the relay KA3 is connected with the direct current power supply, the other end of a coil of the relay KA3 is connected with a collector electrode of a triode of the optocoupler G2 of the second detection circuit, one end of a coil of the relay KA1 is connected with the other end of the normally closed contact of the relay KA3, the other end of the coil of the relay KA1 is grounded, two ends of the normally open contact of the relay KA1 are respectively connected with an output end of a relay protection tester and a voltage terminal row of a substation protection device, a coil of the relay KA4 is, the other end of the normally closed contact of the relay KA4 is connected to the primary-side non-ground terminals of the transformer T4, the transformer T5, and the transformer T6.
5. The circuit for preventing the substation protection measurement and control device from being communicated with the primary equipment during verification according to claim 1, is characterized in that: the circuit further comprises an alarm circuit A1 for sending out warning information when a voltage terminal strip of the transformer substation protection measurement and control device is electrified, wherein the alarm circuit A1 is connected with a coil of the relay KA3 in parallel.
6. The circuit for preventing the substation protection measurement and control device from being communicated with the primary equipment during verification according to claim 5, is characterized in that: the alarm circuit a1 comprises an audible and visual alarm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922121863.5U CN211478632U (en) | 2019-11-29 | 2019-11-29 | Circuit for preventing communication with primary equipment during calibration of transformer substation protection measurement and control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922121863.5U CN211478632U (en) | 2019-11-29 | 2019-11-29 | Circuit for preventing communication with primary equipment during calibration of transformer substation protection measurement and control device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211478632U true CN211478632U (en) | 2020-09-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922121863.5U Active CN211478632U (en) | 2019-11-29 | 2019-11-29 | Circuit for preventing communication with primary equipment during calibration of transformer substation protection measurement and control device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211478632U (en) |
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- 2019-11-29 CN CN201922121863.5U patent/CN211478632U/en active Active
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