CN110514961B - Ring main unit fault monitoring control device - Google Patents
Ring main unit fault monitoring control device Download PDFInfo
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- CN110514961B CN110514961B CN201910795314.8A CN201910795314A CN110514961B CN 110514961 B CN110514961 B CN 110514961B CN 201910795314 A CN201910795314 A CN 201910795314A CN 110514961 B CN110514961 B CN 110514961B
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 55
- 229910018503 SF6 Inorganic materials 0.000 claims description 64
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 claims description 64
- 229960000909 sulfur hexafluoride Drugs 0.000 claims description 8
- 230000000875 corresponding effect Effects 0.000 description 9
- 230000005540 biological transmission Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000010248 power generation Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
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Abstract
The utility model relates to the field of wind power control and discloses a ring main unit fault monitoring and controlling device which comprises a first control power supply, a second control power supply, a microcomputer protection device, 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, wherein the ring main unit fault monitoring and controlling device comprises a ring main unit fault monitoring loop formed by a low SF6 air pressure signal contact, a ring main unit fault signal contact and a protection device power air switch; the ports-420-08-X1.15, -420-08-X1.19 of the ring main unit heavy-load connector X1 are correspondingly connected with the ports-420-02-X1.15, -420-02-X1.19 of the fan control screen heavy-load connector X1', so that a fault monitoring loop of the fan control screen to the ring main unit is formed, related signals can be simultaneously transmitted to the microcomputer protection device and the fan control screen, the reliability of the wind power system is enhanced, and misoperation accidents are effectively reduced.
Description
Technical Field
The utility model relates to the field of wind power control, in particular to a ring main unit fault monitoring and controlling device.
Background
In the field of wind power generation, the traditional wind power generation is to arrange a 35KV box-type boost transformer outside each fan tower, boost the 0.69KV electric energy generated by a fan to 35KV through the box-type boost transformer outside the tower, and then connect the wind power plant 110KV or 220KV boost station after converging through a current collecting circuit, and then merge the wind power plant 110KV or 220KV boost station into a national main power grid after secondary boost.
The boosting mode needs to send the 0.69KV electric energy generated by the fan to 35KV boosting change at a distance of tens of meters outside the tower through a low-voltage cable with a length of hundreds of meters or even hundreds of meters. Fan capacity has evolved from 1.6MW to the current 8MW, tower heights have also increased from tens of meters to as much as 100 to about 200 meters, and with increasing installed capacity, delivery current has increased from 1339 amps to 6694 amps. It is well known that line loss is proportional to the square of the current and proportional to the resistance of the cable. Therefore, the line loss also increases greatly with the increase of the capacity of the blower 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 and nearby arranged beside a generator at the top of a tower, and a ring main unit is arranged at the middle part or the bottom in the tower. The transformer boosts the power of 0.69KV to 35KV, and the current of 1.6MW to 8MW is reduced from 1339-6694 ampere to 26-132 ampere. The high-voltage energy of 35KV is transmitted to a ring main unit in a tower barrel, and the power of 35KV is transmitted to a 110KV or 220KV booster station of a wind power plant after being converged by the ring main unit, and is converged into a national main power grid after being boosted for the second time. Thus, the energy-saving effect is very good. The ring main unit is used 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, so that when the power system fails, the connection between the wind driven generator and the power system can be cut off, and safety accidents are avoided; the utility model patent with publication number of CN202454900U is a ring main unit.
On the other hand, as shown in fig. 1, the control loop and the signal loop inside the fan and the ring main unit are optimized. Through perfecting the protection system, the state and the control signal of the fan reach the ring main unit through the fan control screen, and meanwhile, 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, the interoperability and the reliability of the fan control and the 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 normal conditions, the ring main unit is internally provided with a microcomputer protection device which is mutually related with an operating device arranged in the ring main unit, so that the protection, measurement and control of voltage and current in an electric power system inside the ring main unit can be realized.
However, in the practical application process, a great potential safety hazard exists for the misoperation accident of the control device, so that a certain improvement space exists.
Disclosure of Invention
Aiming at the defects of the prior art, the utility model provides the ring main unit fault monitoring control device, wherein a ring main unit fault monitoring loop is added in the control device, related signals are simultaneously transmitted to a microcomputer protection device and a fan control screen, the reliability of a wind power system is enhanced, and the occurrence of misoperation accidents is effectively reduced.
In order to solve the technical problems, the utility model is solved by the following technical scheme:
a ring main unit fault monitoring control device comprises
The first control power supply and the second control power supply are connected with a power supply air switch 2DK at the positive electrode and the negative electrode of the first control power supply;
the microcomputer protection device comprises working power supply ports 1D3 and 1D4, switching value input ports 3D20 and 3D13 and 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 positive electrode 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 negative electrode of the second control power supply;
the ring main unit SF6 air pressure low monitoring signal loop comprises a normally open contact K2-1 of a relay K2, wherein one end of the normally open contact K2-1 of the relay K2 is connected with a power air switch 2DK of the positive electrode of a first control power supply, and the other end of the normally open contact K2-1 of the relay K2 is connected with the power air switch 2DK of the negative electrode of the first control power supply through ports 3D20 and 3D13 of a microcomputer protection device;
the loop 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 positive electrode of the second control power supply, and the other end of the coil of the relay K8 is connected with the negative electrode of the second control power supply;
the loop network cabinet fault monitoring loop comprises a loop 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 to a port-420-08-X1.15 of the loop network cabinet heavy-load connector X1, and the other end of the normally closed contact K2-2 is connected to a port-420-08-X1.19 of the loop network cabinet heavy-load connector X1; the ports-420-08-X1.15, -420-08-X1.19 of the looped network cabinet heavy-load connector X1 are correspondingly connected with the ports-420-02-X1.15, -420-02-X1.19 of the fan control screen heavy-load connector X1'; an indication unit is connected to the port-420-02-X1.15 of the fan control screen heavy-load connector X1'.
By adopting the scheme, the low-SF 6 air pressure monitoring signal loop is formed by connecting the low-air pressure sensor switch P with the relay K2 in series and connecting the two ends of the power supply air switch 1DK of the 24V second control power supply; the normally open contact K2-1 of the relay K2 is connected in series with ports 3D20 and 3D13 of the microcomputer protection device, and is connected to two ends of a power supply air switch 2DK of a 24V first control power supply for judging that SF6 air pressure is low; then outputting SF6 air pressure low signals to a relay K8 through ports 2D7 and 2D8 of the microcomputer protection device, and simultaneously recording and displaying SF6 air pressure low events to form a ring main unit SF6 air pressure low monitoring signal loop; ports 2D7 and 2D8 of the microcomputer protection device are connected with a relay K8 in series, and are 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; the loop network cabinet fault monitoring loop is composed of a low SF6 air pressure signal contact (normally closed contact K2-2 of a relay K2), a loop network cabinet fault signal contact (normally closed contact K8-1 of a relay K8) and a protection device power supply air switch (auxiliary switch contact 2DK-1 of a power supply air switch 2 DK); the ports-420-08-X1.15, -420-08-X1.19 of the ring main unit heavy-load connector X1 are correspondingly connected with the ports-420-02-X1.15, -420-02-X1.19 of the fan control screen heavy-load connector X1', so that a fault monitoring loop of the fan control screen to the ring main unit is formed, related signals can be simultaneously transmitted to the microcomputer protection device and the fan control screen, the reliability of the wind power system is enhanced, and misoperation accidents are effectively reduced.
Preferably, the indicating unit comprises an indicating element and a power supply, one end of the indicating element is connected with the positive electrode of the power supply, the other end of the indicating element is connected with the port-420-02-X1.15 of the heavy-duty connector X1 'of the fan control screen, and the port-420-02-X1.19 of the heavy-duty connector X1' of the fan control screen is connected with the negative electrode 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 indication element is an indication lamp LD.
By adopting the scheme, the lamplight prompting effect of the indicator lamp is not only striking, but also can not disturb the surrounding environment in the working process, and is more humanized.
Preferably, 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 low-pressure sensor switch P controls the coil of the relay K2 to be electrified and closed, so that the normally open contact K2-1 of the relay K2 is controlled to be closed, the microcomputer protection device outputs SF6 air pressure low signals through the ports 2D7 and 2D8, and meanwhile, the microcomputer protection device records and displays SF6 air pressure low events.
By adopting the scheme, when the SF6 air pressure value in the air chamber of the sulfur hexafluoride breaker is too low, the SF6 air in the air chamber is indicated to leak, and the microcomputer protection device can automatically record the specific occurrence time point of the SF6 air pressure low event at the moment so as to be called by staff to check and analyze data.
Preferably, the microcomputer protection device is connected with a control module, and the control module is connected with a wireless transmitting module; the wireless receiving module is connected with a master server, and a plurality of local devices are connected to the master server; the control module is used for retrieving file data corresponding to the SF6 air pressure low event recorded in the microcomputer protection device, sending the data to the wireless receiving module through the wireless transmitting module, uploading the received data to the total server for storage by the wireless receiving module, and the local equipment is used for retrieving the data stored in the total server and displaying the SF6 air pressure low event corresponding to the data.
By adopting the scheme, the data of the SF6 air pressure low event recorded and stored on the microcomputer protection device can be transmitted to the total server in a wireless mode, and the data in the total server is called through the local equipment to be checked, so that a user can access the SF6 air pressure low event stored in the microcomputer protection device, and the method is more convenient.
Preferably, the control module sorts the file data of the retrieved SF6 air pressure low event according to the occurrence time point of the SF6 air pressure low event, and preferentially sends the file data corresponding to the SF6 air pressure low event with the previous time point to the wireless receiving module through the wireless transmitting module.
By adopting the scheme, because the storage space in the microcomputer protection device is limited, only a specific number of SF6 air pressure low event data can be stored, if the input number exceeds the rated number, the data in front can be covered in sequence, so that the data cannot be stored completely; the control module is used for preferentially wirelessly transmitting file data corresponding to the SF6 air pressure low event with the front time point, so that the data with the front time sequence in the microcomputer protection device 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 microcomputer protection device is more humanized.
The utility model has the remarkable technical effects due to the adoption of the technical scheme: the low-SF 6 air pressure monitoring signal loop is formed by connecting a low-air pressure sensor switch P with a relay K2 in series and connecting two ends of a power air switch 1DK of a 24V second control power supply; the normally open contact K2-1 of the relay K2 is connected in series with ports 3D20 and 3D13 of the microcomputer protection device, and is connected to two ends of a power supply air switch 2DK of a 24V first control power supply for judging that SF6 air pressure is low; then outputting SF6 air pressure low signals to a relay K8 through ports 2D7 and 2D8 of the microcomputer protection device, and simultaneously recording and displaying SF6 air pressure low events to form a ring main unit SF6 air pressure low monitoring signal loop; ports 2D7 and 2D8 of the microcomputer protection device are connected with a relay K8 in series, and are 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; the loop network cabinet fault monitoring loop is composed of a low SF6 air pressure signal contact (normally closed contact K2-2 of a relay K2), a loop network cabinet fault signal contact (normally closed contact K8-1 of a relay K8) and a protection device power supply air switch (auxiliary switch contact 2DK-1 of a power supply air switch 2 DK); the ports-420-08-X1.15, -420-08-X1.19 of the ring main unit heavy-load connector X1 are correspondingly connected with the ports-420-02-X1.15, -420-02-X1.19 of the fan control screen heavy-load connector X1', so that a fault monitoring loop of the fan control screen to the ring main unit is formed, related signals can be simultaneously transmitted to the microcomputer protection device and the fan control screen, the reliability of the wind power system is enhanced, and misoperation accidents are effectively reduced.
Drawings
FIG. 1 is a diagram of a prior art system architecture of a ring main unit, a fan control screen, and a fan;
fig. 2 is a circuit diagram of the first embodiment;
fig. 3 is a logic diagram of ring main unit fault monitoring 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 reference numerals in the above drawings are as follows: 1n, microcomputer protection device; 2. an indication unit; 3. a control module; 4. a wireless transmitting module; 5. a wireless receiving module; 6. a total server; 7. a local device.
Detailed Description
The present utility model will be described in further detail with reference to the accompanying drawings and examples.
Example 1
As shown in fig. 2, the ring main unit fault monitoring and controlling device 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, which each include a positive electrode and a negative electrode (i.e., 24v+ and 24V-). The positive pole and the negative pole of the first control power supply are both connected with a power supply air switch 2DK, and the positive pole and the negative pole of the second control power supply are both connected with a power supply air switch 1DK.
Further, the microcomputer protection device 1n includes working power ports 1D3, 1D4, switching value input ports 3D20, 3D13, switching value output ports 2D7, 2D8, and the working power ports 1D3, 1D4 are respectively connected to the power air switches 2DK at two ends of the first control power source to supply power to the microcomputer protection device 1 n.
Further, the low SF6 air pressure monitoring signal loop comprises a low air pressure sensor switch P and a relay K2, one end of the low air pressure sensor switch P is connected to the positive electrode of the second control power supply, the other end of the low air pressure sensor switch P is connected to one end of a coil of the relay K2, and the other end of the coil of the relay K2 is connected to the negative electrode of the second control power supply.
Furthermore, the loop network cabinet SF6 air pressure low monitoring signal loop comprises a normally open contact K2-1 of a relay K2, one end of the normally open contact K2-1 of the relay K2 is connected with a power air switch 2DK of the positive electrode of the first control power supply, and the other end of the normally open contact K2-1 of the relay K2 is connected with the power air switch 2DK of the negative electrode of the first control power supply through ports 3D20 and 3D13 of a microcomputer protection device 1 n.
Furthermore, the loop network cabinet fault monitoring signal loop comprises a relay K8, a coil of the relay K8 is connected with the switching value output ports 2D7 and 2D8 of the microcomputer protection device 1n in series, the port 2D7 is connected with the positive electrode of the second control power supply, and the other end of the coil of the relay K8 is connected with the negative electrode of the second control power supply.
Still further, the looped netowrk cabinet fault monitoring loop comprises a looped netowrk 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 to a port-420-08-X1.15 of the looped netowrk cabinet heavy load connector X1, and the other end of the normally closed contact K2-2 is connected to a port-420-08-X1.19 of the looped netowrk cabinet heavy load connector X1; the ports-420-08-X1.15, -420-08-X1.19 of the looped network cabinet heavy-load connector X1 are correspondingly connected with the ports-420-02-X1.15, -420-02-X1.19 of the fan control screen heavy-load connector X1'; an indication unit 2 is connected to the port-420-02-X1.15 of the fan control screen heavy-duty connector X1'. The indication unit 2 includes an indication 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 indication element is an indication lamp LD. More specifically, one end of the indicating element is connected to the positive electrode 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 electrode of the power supply.
Example two
On the basis of the first embodiment, the low-pressure sensor switch P is disposed in the air chamber of the sulfur hexafluoride breaker, and 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 low-pressure sensor switch P controls the coil of the relay K2 to be electrically attracted, so as to control the normally open contact K2-1 of the relay K2 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, with reference to the first embodiment and the second embodiment, the working principle of the ring main unit fault monitoring and controlling device is described in detail:
the low-SF 6 air pressure monitoring signal loop is formed by connecting a low-air pressure sensor switch P with a relay K2 in series and connecting two ends of a power air switch 1DK of a 24V second control power supply; the normally open contact K2-1 of the relay K2 is connected in series with ports 3D20 and 3D13 of the microcomputer protection device 1n, and is connected to two ends of a power supply air switch 2DK of a 24V first control power supply for judging that SF6 air pressure is low; then outputting SF6 air pressure low signals to a relay K8 through ports 2D7 and 2D8 of a microcomputer protection device 1n, and simultaneously recording and displaying SF6 air pressure low events to form a ring main unit SF6 air pressure low monitoring signal loop; the ports 2D7 and 2D8 of the microcomputer protection device 1n are connected with the relay K8 in series, and are connected to two ends of the power supply air switch 1DK of the 24V second control power supply to form a ring main unit fault monitoring signal loop; the loop network cabinet fault monitoring loop is composed of a low SF6 air pressure signal contact (normally closed contact K2-2 of a relay K2), a loop network cabinet fault signal contact (normally closed contact K8-1 of a relay K8) and a protection device power supply air switch (auxiliary switch contact 2DK-1 of a power supply air switch 2 DK); the ports-420-08-X1.15, -420-08-X1.19 of the ring main unit heavy-load connector X1 are correspondingly connected with the ports-420-02-X1.15, -420-02-X1.19 of the fan control screen heavy-load connector X1', so that a fan control screen fault monitoring loop for the ring main unit is formed.
As shown in fig. 3, only when the low air pressure sensor switch P detects that the air pressure level in the air chamber of the sulfur hexafluoride circuit breaker is normal and is in an open state, the microcomputer protection device 1n is in a fault-free operation (live contact) state, and the auxiliary switch contact 2DK-1 of the power air switch 2DK is in a closed state; the low SF6 air pressure signal contact (normally closed contact K2-2 of the relay K2), the ring main unit fault-free signal contact (normally closed contact K8-1 of the relay K8) and the protection device power supply air switch (auxiliary switch contact 2DK-1 of the power supply air switch 2 DK) are all closed, and at the moment, the power supply loop of the indicator lamp LD is switched on, so that the indicator lamp LD is lightened to remind a user that the ring main unit system is in a normal running state; otherwise, if any of the above conditions is not satisfied, the indicator lamp LD cannot be turned on, so that the indicator lamp LD is in an off state, so as to remind the user of the system failure of the ring main unit, thereby realizing the logical relationship as shown in fig. 3.
Example III
As shown in fig. 4, in the first embodiment, the microcomputer protection device 1n is connected with a control module 3, where the control module 3 is a chip with data processing capability, including but not limited to a single chip microcomputer, PLC, CPU, MCU, ARM, and the like. The control module 3 is connected with a wireless transmitting module 4; 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 total server 6, the total server 6 is connected with a plurality of local devices 7, and the local devices 7 are preferably computers; the control module 3 is configured to retrieve file data corresponding to the SF6 air pressure low event recorded in the microcomputer protection device 1n, send the data to the wireless receiving module 5 through the wireless transmitting module 4, upload the received data to the total server 6 for storage by the wireless receiving module 5, and the local device 7 is configured to retrieve the data stored in the total server 6 and display the SF6 air pressure low event corresponding to the data. The data of the SF6 air pressure low event recorded and stored on the microcomputer protection device 1n can be transmitted to the total server 6 in a wireless mode, and the data in the total server 6 is called through the local equipment 7 to be checked, so that a user can access the SF6 air pressure low event stored in the microcomputer protection device 1n, and the method is more convenient.
Furthermore, the control module 3 sorts the file data of the retrieved SF6 barometric low event according to the time point when the SF6 barometric low event occurs, and preferentially sends the file data corresponding to the SF6 barometric low event with the previous 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 number of SF6 air pressure low event data can be stored, if the input number exceeds the rated number, the data in front of the input number can be covered in sequence, so that the data cannot be stored completely; the control module 3 is used for preferentially wirelessly transmitting file data corresponding to the SF6 air pressure low event with the front time point, so that the data with the front 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 microcomputer protection device is more humanized.
Claims (5)
1. The utility model provides a looped netowrk cabinet fault monitoring control device which characterized in that: comprising
The first control power supply and the second control power supply are connected with a power supply air switch 2DK at the positive electrode and the negative electrode of the first control power supply;
the microcomputer protection device (1 n) comprises working power supply ports 1D3 and 1D4, switching value input ports 3D20 and 3D13 and 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 positive electrode 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 negative electrode of the second control power supply;
the ring main unit SF6 air pressure low monitoring signal loop comprises a normally open contact K2-1 of a relay K2, wherein one end of the normally open contact K2-1 of the relay K2 is connected with a power air switch 2DK of the positive electrode of a first control power supply, and the other end of the normally open contact K2-1 of the relay K2 is connected with the power air switch 2DK of the negative electrode of the first control power supply through ports 3D20 and 3D13 of a microcomputer protection device (1 n);
the loop 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 (1 n) in series, the port 2D7 is connected with the positive electrode of a second control power supply, and the other end of the coil of the relay K8 is connected with the negative electrode of the second control power supply;
the loop network cabinet fault monitoring loop comprises a loop 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 to a port-420-08-X1.15 of the loop network cabinet heavy-load connector X1, and the other end of the normally closed contact K2-2 is connected to a port-420-08-X1.19 of the loop network cabinet heavy-load connector X1; the ports-420-08-X1.15, -420-08-X1.19 of the looped network cabinet heavy-load connector X1 are correspondingly connected with the ports-420-02-X1.15, -420-02-X1.19 of the fan control screen heavy-load connector X1'; an indication unit (2) is connected to the port-420-02-X1.15 of the fan control screen heavy-load connector X1';
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 low-pressure sensor switch P controls the coil of the relay K2 to be electrified and closed, so that the normally open contact K2-1 of the relay K2 is controlled to be closed, the microcomputer protection device (1 n) outputs SF6 air pressure low signals through the ports 2D7 and 2D8, and meanwhile the microcomputer protection device (1 n) records and displays SF6 air pressure low events.
2. The ring main unit fault monitoring and handling 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 with the positive electrode of the power supply, the other end of the indicating element is connected with the port-420-02-X1.15 of the heavy-duty connector X1 'of the fan control screen, and the port-420-02-X1.19 of the heavy-duty connector X1' of the fan control screen is connected with the negative electrode of the power supply.
3. The ring main unit fault monitoring and handling device according to claim 2, wherein: the indication element is an indication lamp LD.
4. The ring main unit fault monitoring and handling device according to claim 1, wherein: the microcomputer protection device (1 n) is connected with a control module (3), and the control module (3) is connected with a wireless transmitting module (4); the wireless receiving module (5) is used for carrying out data exchange with the wireless transmitting module (4), the wireless receiving module (5) is connected with a total server (6), and the total server (6) is connected with a plurality of local devices (7); the control module (3) is used for calling file data corresponding to the SF6 air pressure low event recorded in the microcomputer protection device (1 n), the data is sent to the wireless receiving module (5) through the wireless transmitting module (4), the wireless receiving module (5) uploads the received data to the total server (6) for storage, and the local equipment (7) is used for calling the data stored in the total server (6) and displaying the SF6 air pressure low event corresponding to the data.
5. The ring main unit fault monitoring and handling device of claim 4, wherein: the control module (3) sorts the file data of the called SF6 air pressure low event according to the occurrence time point of the SF6 air pressure low event, and preferentially sends the file data corresponding to the SF6 air pressure low event with the previous time point to the wireless receiving module (5) through the wireless transmitting module (4).
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| CN110514961A (en) | 2019-11-29 |
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