CN211905559U - Looped netowrk cabinet fault monitoring controls device - Google Patents
Looped netowrk cabinet fault monitoring controls device Download PDFInfo
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- CN211905559U CN211905559U CN201921401224.8U CN201921401224U CN211905559U CN 211905559 U CN211905559 U CN 211905559U CN 201921401224 U CN201921401224 U CN 201921401224U CN 211905559 U CN211905559 U CN 211905559U
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Abstract
The utility model relates to a wind-powered electricity generation control field discloses a looped netowrk cabinet trouble monitoring control device, including first control power supply, second control power supply, computer protection device, low SF6 atmospheric pressure monitor signal return circuit, looped netowrk cabinet SF6 atmospheric pressure low monitor signal return circuit, looped netowrk cabinet trouble monitor signal return circuit, and looped netowrk cabinet trouble monitor return circuit, the utility model discloses a looped netowrk cabinet trouble monitoring control device comprises low SF6 atmospheric pressure signal contact, looped netowrk cabinet trouble signal contact, and protection device power air switch and constitutes looped netowrk cabinet trouble monitor return circuit; the fault monitoring loop of the ring main unit by the fan control screen is formed by correspondingly connecting ports-420-08-X1.15 and-420-08-X1.19 of the heavy-load connector X1 of the ring main unit with ports-420-02-X1.15 and-420-02-X1.19 of the heavy-load connector X1' of the fan control screen.
Description
Technical Field
The utility model relates to a wind-powered electricity generation control field especially relates to looped netowrk cabinet fault monitoring controls device.
Background
In the field of wind power generation, in the traditional wind power generation, a 35KV box-type step-up transformer is arranged outside each fan tower, 0.69KV electric energy generated by the fan is changed through the box-type step-up transformer outside the tower, is firstly boosted to 35KV, is converged by a current collecting circuit, is connected to a 110KV or 220KV boosting station of a wind power plant, and is converged to a national main power grid after being boosted for the second time.
In the above boosting mode, 0.69KV electric energy generated by the fan needs to be transmitted to 35KV boosting transformer several tens meters away from the tower through the low-voltage cable up to hundreds of meters or even several hundreds of meters. The capacity of the fan is developed from 1.6MW to 8MW at present, the height of the tower is also increased from tens of meters to about 100 to 200 meters, and the current is increased from 1339 amperes to 6694 amperes with the gradual increase of the installed capacity. It is well known that line loss is proportional to the square of the current and to the resistance of the cable. Therefore, the line loss also increases greatly with the increase of the fan capacity and the increase of the cable length, resulting in an uneconomical operation mode.
At present, a new development trend is that a step-up transformer is directly installed nearby a generator at the top of a tower barrel, and a ring main unit is installed in the middle or at the bottom of the tower barrel. The transformer boosts the 0.69KV electric energy generated by the fan to 35KV nearby, and the current transmitted by the fan of 1.6MW to 8MW is also reduced from 1339-6694 ampere to 26-132 ampere. The 35KV high-voltage electric energy is transmitted to a ring main unit in the tower, after being converged by the ring main unit, the 35KV electric energy is transmitted to a 110KV or 220KV boosting station of the wind power plant, and after secondary boosting, the 35KV high-voltage electric energy is converged into a national main power grid. Thus, a good energy-saving effect is achieved. The ring main unit serves as intermediate electrical equipment for connecting the wind driven generator and the power system, and the built-in high-voltage switch equipment can play a role in protection, and can cut off the connection between the wind driven generator and the power system when the power system fails, so that safety accidents are avoided; for example, the utility model with publication number CN202454900U is a similar ring main unit.
On the other hand, as shown in fig. 1, a control loop and a signal loop inside the blower and the ring main unit are optimized. By improving the protection system, the state and control signals of the fan can reach the ring main unit through the fan control screen, and related signals of the ring main unit are uploaded to the fan control screen, so that the fan and the ring main unit are electrically interlocked, and the coordination, interoperability and reliability of the fan control and ring main unit control system are improved. On the other hand, after the design scheme is optimized, the power consumption of the control system is greatly reduced, and the power supply is changed from 220V or 110V to 24V direct current power supply, so that the control operation requirement is completely met. Under the general condition, a microcomputer protection device is arranged in the ring main unit and is mutually associated with an operating device arranged in the ring main unit, so that the voltage and current in an electric power system in the ring main unit can be protected, measured and controlled.
However, in the practical application process, misoperation accidents of the control device occur, and great potential safety hazards exist, so that certain improvement space exists.
SUMMERY OF THE UTILITY MODEL
The utility model discloses to prior art's shortcoming, provide a looped netowrk cabinet trouble monitoring control device, increase looped netowrk cabinet trouble monitoring circuit in control device, transmit computer protection device and fan control screen to relevant signal simultaneously, strengthened wind power system's reliability, effectively reduce the emergence of maloperation accident.
In order to solve the technical problem, the utility model discloses a following technical scheme can solve:
a fault monitoring and controlling device for ring main unit comprises
The positive pole and the negative pole of the first control power supply are both connected with a power supply air switch 2 DK;
the microcomputer protection device comprises working power supply ports 1D3 and 1D4, switching value input ports 3D20 and 3D13, switching value output ports 2D7 and 2D8, wherein the working power supply ports 1D3 and 1D4 are respectively connected with a power supply air switch 2DK at two ends of a first control power supply;
the low SF6 air pressure monitoring signal loop comprises a low air pressure sensor switch P and a relay K2, wherein one end of the low air pressure sensor switch P is connected with the anode of the second control power supply, the other end of the low air pressure sensor switch P is connected with one end of a coil of the relay K2, and the other end of the coil of the relay K2 is connected with the cathode of the second control power supply;
the looped netowrk cabinet SF6 atmospheric pressure hangs down and monitors the signal return circuit, including relay K2 normally open contact K2-1, relay K2 normally open contact K2-1's one end is connected to the anodal power air switch 2DK of first control power, and the other end passes through port 3D20, 3D13 of computer protection device and connects to the negative pole of first control power's power air switch 2 DK;
the looped network cabinet fault monitoring signal loop comprises a relay K8, wherein a coil of the relay K8 is connected with switching value output ports 2D7 and 2D8 of the microcomputer protection device in series, the port 2D7 is connected with the anode of a second control power supply, and the other end of the coil of the relay K8 is connected with the cathode of the second control power supply;
the looped network cabinet fault monitoring loop comprises a looped network cabinet heavy-load connector X1, a fan control screen heavy-load connector X1', a normally closed contact K2-2 of a relay K2, a normally closed contact K8-1 of a relay K8 and an auxiliary switch contact 2DK-1 of a power supply air switch 2DK which are sequentially connected in series, wherein the other end of the auxiliary switch contact 2DK-1 is connected with a port-420-08-X1.15 of a looped network cabinet heavy-load connector X1, and the other end of the normally closed contact K2-2 is connected with a port-420-08-X1.19 of a looped network heavy-load connector X1; ports-420-08-X1.15 and-420-08-X1.19 of the ring main unit heavy-load connector X1 are correspondingly connected with ports-420-02-X1.15 and-420-02-X1.19 of a fan control screen heavy-load connector X1'; an indicating unit is connected to the port-420-02-X1.15 of the heavy-load connector X1' of the fan control screen.
By adopting the scheme, the low-pressure sensor switch P is connected with the relay K2 in series and connected to two ends of a power supply air switch 1DK of a 24V second control power supply to form a low-SF 6 air pressure monitoring signal loop; a normally open contact K2-1 of a relay K2 is connected with ports 3D20 and 3D13 of a microcomputer protection device in series and connected to two ends of a power supply air switch 2DK of a 24V first control power supply to judge that the pressure of SF6 is low; then, SF6 air pressure low signals are output to a relay K8 through ports 2D7 and 2D8 of the microcomputer protection device, and SF6 air pressure low events are recorded and displayed at the same time to form an SF6 air pressure low monitoring signal loop of the ring main unit; ports 2D7 and 2D8 of the microcomputer protection device are connected in series with a relay K8 and connected to two ends of a power supply air switch 1DK of a 24V second control power supply to form a ring main unit fault monitoring signal loop; a low SF6 air pressure signal contact (a normally closed contact K2-2 of a relay K2), a looped network cabinet fault signal contact (a normally closed contact K8-1 of a relay K8) and a protection device power air switch (an auxiliary switch contact 2DK-1 of a power air switch 2 DK) form a looped network cabinet fault monitoring loop; the fault monitoring loop of the ring main unit by the fan control screen is formed by correspondingly connecting the ports-420-08-X1.15 and-420-08-X1.19 of the heavy-load connector X1 of the ring main unit and the ports-420-02-X1.15 and-420-02-X1.19 of the heavy-load connector X1' of the fan control screen, so that related signals can be simultaneously transmitted to the microcomputer protection device and the fan control screen, the reliability of a wind power system is enhanced, and the occurrence of misoperation accidents is effectively reduced.
Preferably, the indicating unit comprises an indicating element and a power supply, one end of the indicating element is connected to the positive pole of the power supply, the other end of the indicating element is connected to the port-420-02-X1.15 of the heavy-load connector X1 'of the fan control panel, and the port-420-02-X1.19 of the heavy-load connector X1' of the fan control panel is connected to the negative pole of the power supply.
By adopting the scheme, the power supply can provide electric energy for the operation of the indicating element and the ring main unit fault monitoring loop, and when the electronic element in the ring main unit fault monitoring loop makes corresponding action, the indicating element can switch the indicating mode under the action of the power supply.
Preferably, the indicator element is an indicator lamp LD.
By adopting the scheme, the light prompt effect of the indicator light is not only striking, but also does not disturb the surrounding environment in the working process, and is more humanized.
The utility model discloses owing to adopted above technical scheme, have apparent technological effect: a low-SF 6 air pressure monitoring signal loop is formed by connecting a low-SF sensor switch P and a relay K2 in series and connecting the low-SF sensor switch P and the relay K2 to two ends of a power supply air switch 1DK of a 24V second control power supply; a normally open contact K2-1 of a relay K2 is connected with ports 3D20 and 3D13 of a microcomputer protection device in series and connected to two ends of a power supply air switch 2DK of a 24V first control power supply to judge that the pressure of SF6 is low; then, SF6 air pressure low signals are output to a relay K8 through ports 2D7 and 2D8 of the microcomputer protection device, and SF6 air pressure low events are recorded and displayed at the same time to form an SF6 air pressure low monitoring signal loop of the ring main unit; ports 2D7 and 2D8 of the microcomputer protection device are connected in series with a relay K8 and connected to two ends of a power supply air switch 1DK of a 24V second control power supply to form a ring main unit fault monitoring signal loop; a low SF6 air pressure signal contact (a normally closed contact K2-2 of a relay K2), a looped network cabinet fault signal contact (a normally closed contact K8-1 of a relay K8) and a protection device power air switch (an auxiliary switch contact 2DK-1 of a power air switch 2 DK) form a looped network cabinet fault monitoring loop; the fault monitoring loop of the ring main unit by the fan control screen is formed by correspondingly connecting the ports-420-08-X1.15 and-420-08-X1.19 of the heavy-load connector X1 of the ring main unit and the ports-420-02-X1.15 and-420-02-X1.19 of the heavy-load connector X1' of the fan control screen, so that related signals can be simultaneously transmitted to the microcomputer protection device and the fan control screen, the reliability of a wind power system is enhanced, and the occurrence of misoperation accidents is effectively reduced.
Drawings
Fig. 1 is a system architecture diagram of a ring main unit, a fan control screen and a fan in the prior art;
FIG. 2 is a circuit diagram of the first embodiment;
fig. 3 is a logic diagram of fault monitoring of the ring main unit according to the first embodiment;
fig. 4 is a system architecture diagram of the third embodiment.
The names of the parts indicated by the numerical references in the above figures are as follows: 1n, a microcomputer protection device; 2. an indicating unit; 3. a control module; 4. a wireless transmitting module; 5. a wireless receiving module; 6. a main server; 7. a local device.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Example one
As shown in fig. 2, the ring main unit fault monitoring and controlling apparatus disclosed in this embodiment includes a first control power supply, a second control power supply, a microcomputer protection device 1n, a low SF6 air pressure monitoring signal loop, a ring main unit SF6 air pressure low monitoring signal loop, a ring main unit fault monitoring signal loop, and a ring main unit fault monitoring loop. The first control power supply and the second control power supply are preferably 24V DC power supplies, and each control power supply comprises a positive electrode and a negative electrode (namely 24V + and 24V-). The positive pole and the negative pole of first control power all are connected with power air switch 2DK, and the positive pole and the negative pole of second control power all are connected with power air switch 1 DK.
Furthermore, the microcomputer protection device 1n includes working power supply ports 1D3, 1D4, switching value input ports 3D20, 3D13, switching value output ports 2D7, 2D8, and the working power supply ports 1D3, 1D4 are respectively connected to the power supply air switch 2DK at both ends of the first control power supply to supply power to the microcomputer protection device 1 n.
Further, the low SF6 pressure monitoring signal circuit includes a low pressure sensor switch P and a relay K2, wherein one end of the low pressure sensor switch P is connected to the positive pole of the second control power supply, the other end is connected to one end of the coil of the relay K2, and the other end of the coil of the relay K2 is connected to the negative pole of the second control power supply.
Furthermore, the looped netowrk cabinet SF6 atmospheric pressure hangs down the monitor signal return circuit and includes normally open contact K2-1 of relay K2, and the one end of normally open contact K2-1 of relay K2 is connected with the anodal power air switch 2DK of first control power, and the other end passes through port 3D20, 3D13 of computer protection device 1n and connects with the anodal power air switch 2DK of first control power.
Furthermore, the ring main unit fault monitoring signal circuit comprises a relay K8, a coil of the relay K8 is connected in series with the switching value output ports 2D7 and 2D8 of the microcomputer protection device 1n, the port 2D7 is connected to the positive pole of the second control power supply, and the other end of the coil of the relay K8 is connected to the negative pole of the second control power supply.
Furthermore, the looped network cabinet fault monitoring loop comprises a looped network cabinet heavy-load connector X1, a fan control screen heavy-load connector X1', a normally closed contact K2-2 of a relay K2, a normally closed contact K8-1 of the relay K8 and an auxiliary switch contact 2DK-1 of a power supply air switch 2DK which are sequentially connected in series, wherein the other end of the auxiliary switch contact 2DK-1 is connected with a port-420-08-X1.15 of a looped network cabinet heavy-load connector X1, and the other end of the normally closed contact K2-2 is connected with a port-420-08-X1.19 of a looped network cabinet heavy-load connector X1; ports-420-08-X1.15 and-420-08-X1.19 of the ring main unit heavy-load connector X1 are correspondingly connected with ports-420-02-X1.15 and-420-02-X1.19 of a fan control screen heavy-load connector X1'; the port-420-02-X1.15 of the fan control screen heavy-duty connector X1' is connected with an indicating unit 2. The indicating unit 2 includes an indicating element and a power supply, wherein the power supply is preferably a 24V DC power supply, which includes a positive electrode and a negative electrode (i.e. 24V + and 24V-). The indicating element is an indicator lamp LD. More specifically, one end of the indicating element is connected to the positive pole of the power supply, the other end of the indicating element is connected to the port-420-02-X1.15 of the heavy-load connector X1 'of the fan control panel, and the port-420-02-X1.19 of the heavy-load connector X1' of the fan control panel is connected to the negative pole of the power supply.
Example two
On the basis of the first embodiment, the low-pressure sensor switch P is arranged in the air chamber of the sulfur hexafluoride breaker, when the low-pressure sensor switch P detects that the air pressure value in the air chamber of the sulfur hexafluoride breaker is too low, the coil of the relay K2 is controlled to be electrified and sucked, so that the normally open contact K2-1 of the relay K2 is controlled to be closed, the microcomputer protection device 1n outputs an SF6 air pressure low signal through the ports 2D7 and 2D8, and meanwhile, the microcomputer protection device 1n records and displays an SF6 air pressure low event.
Now, the working principle of the ring main unit fault monitoring and controlling device is described in detail with reference to the first embodiment and the second embodiment:
a low-SF 6 air pressure monitoring signal loop is formed by connecting a low-SF sensor switch P and a relay K2 in series and connecting the low-SF sensor switch P and the relay K2 to two ends of a power supply air switch 1DK of a 24V second control power supply; a normally open contact K2-1 of a relay K2 is connected in series with ports 3D20 and 3D13 of a microcomputer protection device 1n and connected to two ends of a power supply air switch 2DK of a 24V first control power supply to judge that the pressure of SF6 is low; then, an SF6 air pressure low signal is output to a relay K8 through ports 2D7 and 2D8 of the microcomputer protection device 1n, and meanwhile, an SF6 air pressure low event is recorded and displayed to form an SF6 air pressure low monitoring signal loop of the ring main unit; ports 2D7 and 2D8 of the microcomputer protection device 1n are connected with a relay K8 in series and connected to two ends of a power supply air switch 1DK of a 24V second control power supply to form a ring main unit fault monitoring signal loop; a low SF6 air pressure signal contact (a normally closed contact K2-2 of a relay K2), a looped network cabinet fault signal contact (a normally closed contact K8-1 of a relay K8) and a protection device power air switch (an auxiliary switch contact 2DK-1 of a power air switch 2 DK) form a looped network cabinet fault monitoring loop; the fault monitoring loop of the ring main unit by the fan control screen is formed by correspondingly connecting ports-420-08-X1.15 and-420-08-X1.19 of the heavy-load connector X1 of the ring main unit with ports-420-02-X1.15 and-420-02-X1.19 of the heavy-load connector X1' of the fan control screen.
As shown in fig. 3, only when the low pressure sensor switch P detects that the pressure level in the sulfur hexafluoride breaker gas chamber is normal and in an off state, the microcomputer protection device 1n is in a fault-free operation (live contact) state, and simultaneously the auxiliary switch contact 2DK-1 of the power supply air switch 2DK is in a closed state; the low SF6 air pressure signal contact (normally closed contact K2-2 of relay K2), the looped network cabinet no-fault signal contact (normally closed contact K8-1 of relay K8) and the protection device power air switch (auxiliary switch contact 2DK-1 of power air switch 2 DK) are all closed, at the moment, the power supply loop of the indicator light LD is switched on, so that the indicator light LD is lightened to remind a user that the looped network cabinet system is in a normal operation state; on the contrary, if any one of the above conditions is not met, the indicator light LD cannot be turned on, so that the indicator light LD is in an off state to remind the user of the fault of the ring main unit system, thereby implementing the logical relationship shown in fig. 3.
EXAMPLE III
As shown in fig. 4, on the basis of the first embodiment, the microcomputer protection device 1n is connected to a control module 3, and the control module 3 is a chip with data processing capability, including but not limited to a single chip microcomputer, a PLC, a CPU, an MCU, an ARM, and the like. The control module 3 is connected with a wireless transmitting module 4; the wireless receiving module 5 is used for exchanging data with the wireless transmitting module 4, and the wireless transmitting module 4 and the wireless receiving module 5 can be Bluetooth modules or infrared receiving and transmitting modules. The wireless receiving module 5 is connected with a main server 6, the main server 6 is connected with a plurality of local devices 7, and the local devices 7 are preferably computers; the control module 3 is used for retrieving file data corresponding to an SF6 low-pressure event recorded in the microcomputer protection device 1n and sending the data to the wireless receiving module 5 through the wireless transmitting module 4, the wireless receiving module 5 uploads the received data to the main server 6 for storage, and the local device 7 is used for retrieving data stored in the main server 6 and displaying an SF6 low-pressure event corresponding to the data. The data of the SF6 low-pressure event recorded and stored in the microcomputer protection device 1n can be transmitted to the main server 6 in a wireless mode, and the data in the main server 6 is called through the local device 7 to be checked, so that a user can access the SF6 low-pressure event stored in the microcomputer protection device 1n, and the microcomputer protection device is more convenient to use.
Furthermore, the control module 3 sorts the file data of the SF6 barometric low event according to the time point of the SF6 barometric low event, and preferentially sends the file data corresponding to the SF6 barometric low event with the earlier time point to the wireless receiving module 5 through the wireless transmitting module 4. Because the storage space in the microcomputer protection device 1n is limited, only a specific amount of SF6 barometric low event data can be stored, if the input amount exceeds the rated amount, the previous data can be sequentially covered, and the data cannot be completely stored; the control module 3 preferentially sends the file data corresponding to the SF6 low-pressure event with the earlier time point in a wireless mode, so that the data with the earlier time sequence in the microcomputer protection device 1n can be effectively stored, the data transmission quantity in the wireless transmission process can be effectively reduced, the transmission efficiency is improved, the transmission power consumption is reduced, and the system is more humanized.
Claims (3)
1. The utility model provides a looped netowrk cabinet fault monitoring controlling means which characterized in that: comprises that
The positive pole and the negative pole of the first control power supply are both connected with a power supply air switch 2 DK;
the microcomputer protection device (1n) comprises working power supply ports 1D3 and 1D4, switching value input ports 3D20 and 3D13, switching value output ports 2D7 and 2D8, wherein the working power supply ports 1D3 and 1D4 are respectively connected with a power supply air switch 2DK at two ends of a first control power supply;
the low SF6 air pressure monitoring signal loop comprises a low air pressure sensor switch P and a relay K2, wherein one end of the low air pressure sensor switch P is connected with the anode of the second control power supply, the other end of the low air pressure sensor switch P is connected with one end of a coil of the relay K2, and the other end of the coil of the relay K2 is connected with the cathode of the second control power supply;
the looped netowrk cabinet SF6 atmospheric pressure hangs down and monitors the signal return circuit, including relay K2 normally open contact K2-1, relay K2 normally open contact K2-1's one end is connected to the anodal power air switch 2DK of first control power, and the other end passes through port 3D20, 3D13 of computer protection device (1n) and connects to the negative pole of first control power's power air switch 2 DK;
the looped network cabinet fault monitoring signal loop comprises a relay K8, wherein a coil of the relay K8 is connected with switching value output ports 2D7 and 2D8 of a microcomputer protection device (1n) in series, the port 2D7 is connected with the anode of a second control power supply, and the other end of the coil of the relay K8 is connected with the cathode of the second control power supply;
the looped network cabinet fault monitoring loop comprises a looped network cabinet heavy-load connector X1, a fan control screen heavy-load connector X1', a normally closed contact K2-2 of a relay K2, a normally closed contact K8-1 of a relay K8 and an auxiliary switch contact 2DK-1 of a power supply air switch 2DK which are sequentially connected in series, wherein the other end of the auxiliary switch contact 2DK-1 is connected with a port-420-08-X1.15 of a looped network cabinet heavy-load connector X1, and the other end of the normally closed contact K2-2 is connected with a port-420-08-X1.19 of a looped network heavy-load connector X1; ports-420-08-X1.15 and-420-08-X1.19 of the ring main unit heavy-load connector X1 are correspondingly connected with ports-420-02-X1.15 and-420-02-X1.19 of a fan control screen heavy-load connector X1'; the port-420-02-X1.15 of the heavy-load connector X1' of the fan control screen is connected with an indicating unit (2).
2. The ring main unit fault monitoring and controlling device according to claim 1, wherein: the indicating unit (2) comprises an indicating element and a power supply, one end of the indicating element is connected to the positive pole of the power supply, the other end of the indicating element is connected to the port-420-02-X1.15 of the fan control screen heavy-load connector X1 ', and the port-420-02-X1.19 of the fan control screen heavy-load connector X1' is connected to the negative pole of the power supply.
3. The ring main unit fault monitoring and controlling device according to claim 2, wherein: the indicating element is an indicator lamp LD.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921401224.8U CN211905559U (en) | 2019-08-27 | 2019-08-27 | Looped netowrk cabinet fault monitoring controls device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921401224.8U CN211905559U (en) | 2019-08-27 | 2019-08-27 | Looped netowrk cabinet fault monitoring controls device |
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| CN211905559U true CN211905559U (en) | 2020-11-10 |
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| CN201921401224.8U Active CN211905559U (en) | 2019-08-27 | 2019-08-27 | Looped netowrk cabinet fault monitoring controls device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110514961A (en) * | 2019-08-27 | 2019-11-29 | 宁波天安（集团）股份有限公司 | Ring network cabinet fault monitoring control device |
| CN113014239A (en) * | 2021-01-29 | 2021-06-22 | 库柏爱迪生(平顶山)电子科技有限公司 | Switch operating device capable of realizing electric opening and closing |
-
2019
- 2019-08-27 CN CN201921401224.8U patent/CN211905559U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110514961A (en) * | 2019-08-27 | 2019-11-29 | 宁波天安（集团）股份有限公司 | Ring network cabinet fault monitoring control device |
| CN110514961B (en) * | 2019-08-27 | 2023-12-08 | 宁波天安（集团）股份有限公司 | Ring main unit fault monitoring control device |
| CN113014239A (en) * | 2021-01-29 | 2021-06-22 | 库柏爱迪生(平顶山)电子科技有限公司 | Switch operating device capable of realizing electric opening and closing |
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