CN220210013U - Motor protection circuit for preventing water supply interruption in water supply pump station - Google Patents
Motor protection circuit for preventing water supply interruption in water supply pump station Download PDFInfo
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- CN220210013U CN220210013U CN202321745453.8U CN202321745453U CN220210013U CN 220210013 U CN220210013 U CN 220210013U CN 202321745453 U CN202321745453 U CN 202321745453U CN 220210013 U CN220210013 U CN 220210013U
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- water supply
- frequency converter
- check valve
- pump station
- motor
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 56
- 238000010586 diagram Methods 0.000 description 4
- 230000001360 synchronised effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
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Abstract
The utility model relates to the technical field of pump station electrical control, and particularly discloses a motor protection circuit for preventing water supply interruption in a water supply pump station, which comprises a frequency converter and a check valve, wherein the input end of the frequency converter is connected with a high-voltage bus, the output end of the frequency converter is connected with a motor, and a first circuit breaker is arranged at the output end of the frequency converter; the check valve is connected with the check valve control box, a change-over switch is arranged in the check valve control box, the change-over switch is connected with the output end of the frequency converter through a circuit breaker, and the change-over switch is connected with the internal circuit of the check valve control box through a circuit breaker II; the utility model adopts the change-over switch to connect the 380V power supply in the frequency converter into the check valve control box, uses the built-in low-voltage (380V) power supply of the frequency converter as the second power supply of the check valve control box, realizes the synchronization of the check valve with the frequency converter and the motor control power supply, avoids the interruption of water supply and overload of the motor when the power supply and the circuit are in fault, effectively ensures the stability of water supply and prolongs the service life of the motor.
Description
Technical Field
The utility model relates to the technical field of pump station electrical control, in particular to a motor protection circuit for preventing water supply interruption in a water supply pump station.
Background
The water machine system of the water supply pump station comprises a water inlet pipe, a water inlet valve 2, a water pump unit 1, a hydraulic control slow-closing check valve 3, a water outlet valve 4 and a water outlet pipe (shown in figure 1). As shown in the structure diagram of the pump station power supply system shown in FIG. 2, rated voltages of the motor and the frequency converter are 10KV, the 10KV power supply high-voltage bus of the high-voltage distribution room supplies power, meanwhile, the 10KV power supply high-voltage bus supplies power to a pump station transformer of the pump station, and a 380V power supply output by the pump station transformer is connected to a water inlet valve control box, a check valve control box, a water outlet valve control box and a frequency converter control box.
The power supply system is characterized in that when a high-voltage (10 KV) power supply is normal and a low-voltage (380V) power supply and a circuit are in fault, the operation of the frequency converter is not influenced by the built-in low-voltage (380V) power supply, the motor normally works, the water pump normally operates, the check valve is automatically closed, water supply is interrupted, and overload operation of the motor is caused due to the fact that an outlet of the water pump is closed, so that the motor is overloaded and heated. Therefore, there is an urgent need to design a motor protection circuit for preventing water supply interruption in a water supply pump station, so as to solve the problems of water interruption and motor overload damage caused by power control factors of the existing pump station.
Disclosure of Invention
Aiming at the problems in the prior art, the utility model aims to provide a motor protection circuit for preventing water supply interruption in a water supply pump station.
The technical scheme adopted for solving the technical problems is as follows: the motor protection circuit for preventing water supply interruption in the water supply pump station comprises a frequency converter and a check valve, wherein the input end of the frequency converter is connected with a high-voltage bus, the output end of the frequency converter is connected with a motor, and a first circuit breaker is arranged at the output end of the frequency converter;
the check valve is connected with the check valve control box, a change-over switch is arranged in the check valve control box, the change-over switch is connected with the output end of the frequency converter through a circuit breaker, and the change-over switch is connected with the internal circuit of the check valve control box through a circuit breaker II.
Specifically, the output end of the frequency converter comprises a U end, a V end and a W end, the U end, the V end and the W end correspond to a point a, a point b and a point c on an output line, and the point a, the point b and the point c on the output line are connected with a circuit breaker I.
Specifically, points a, b and c on an output line at the rear part of the circuit breaker are correspondingly connected with terminals 1, 5, 9 and 13 of the transfer switch through zero wires.
Specifically, the 2 and 4 terminals of the transfer switch are short-circuited, the 6 and 8 terminals are short-circuited, the 10 and 12 terminals are short-circuited, and the 14 and 16 terminals are short-circuited and then connected with the circuit breaker II.
Specifically, the high-voltage bus is also connected with the input end of a pump station transformer, and the output end of the pump station transformer is connected with the low-voltage power distribution cabinet.
The three-phase four-wire low-voltage control power supply of the low-voltage power distribution cabinet is connected to terminals 3, 7, 11 and 15 of the change-over switch.
The utility model has the following beneficial effects:
the motor protection circuit for preventing water supply interruption in the water supply pump station is designed by adopting the change-over switch to connect a 380V power supply in the frequency converter into the check valve control box, and utilizing a built-in low-voltage (380V) power supply of the frequency converter as a second power supply of the check valve control box, so that the synchronization of the check valve with the frequency converter and the motor control power supply is realized, the water supply interruption and motor overload during the faults of the power supply and the circuit are avoided, the water supply stability is effectively ensured, and the service life of the motor is prolonged.
Drawings
FIG. 1 is a schematic diagram of a conventional water supply pump station assembly.
Fig. 2 is a schematic diagram of a conventional power supply system for a water supply pump station unit.
Fig. 3 is a schematic circuit structure of the circuit breaker connected to the output end of the frequency converter.
Fig. 4 is a schematic diagram of a connection circuit structure of the transfer switch.
In the figure: 1-a water pump unit; 2-a water inlet valve; 3-check valve; 4-a water outlet valve; 5-frequency converter; 6-a motor; 7-a high voltage bus; 8-pump station transformers; 9-a low-voltage power distribution cabinet; 10-a first circuit breaker; 11-a change-over switch; 12-second circuit breaker.
Detailed Description
The technical solutions in the embodiments of the present utility model will be clearly and completely described in further detail below with reference to the accompanying drawings in the embodiments of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
As shown in fig. 3-4, a motor protection circuit for preventing water supply interruption in a water supply pump station comprises a frequency converter 5, a motor 6, a first breaker 10, a change-over switch 11, a second breaker 12 and a check valve 3, wherein the input end of the frequency converter 5 is connected with a high-voltage bus 7 (10 KV), the high-voltage bus 7 is also connected with the input end of a pump station transformer 8, and the output end of the pump station transformer 8 is connected with a low-voltage power distribution cabinet 9.
The output end of the frequency converter 5 is connected with a motor 6, the model of the frequency converter 5 is a tandem HD90S-J100-450-DB type 10KV frequency converter, the model of the motor 6 is a Y450-4 type 355KW motor and a 10KV motor, a first circuit breaker 10 is arranged at the output end of the frequency converter 5, and the first circuit breaker 10 is of a model of C65N-D16-3P.
The check valve 3 is connected with a check valve control box, a change-over switch 11 is arranged in the check valve control box, and the types of the change-over switch 11 are LW5D-16 and 5-pole 2-gear change-over switches. The change-over switch 11 is connected with the output end of the frequency converter 5 through the first circuit breaker 10, and the change-over switch 11 is connected with the internal circuit of the check valve control box through the second circuit breaker 12. The type of the second breaker 12 is DZ47-63 breaker. The model of the check valve 3 is KD741H-V10 hydraulic control slow-closing check butterfly valve, which is called slow-closing valve for short, the electric hydraulic system in the check valve control box is used for controlling the valve opening and closing, the 380V power supply of the low-voltage power distribution cabinet is used for supplying power, and the valve is automatically closed after power failure. The type of the water inlet valve 2 is PQ940H-10C electric eccentric half ball valve, which is called ball valve for short, the electric actuator controls the valve opening and closing, the low-voltage power distribution cabinet 380V power supply supplies power, and the valve is kept in the original state after power failure. The type of the water outlet valve is D941H-10 electric flange butterfly valve, which is called butterfly valve for short, the electric actuator controls the valve opening and closing, the low-voltage power distribution cabinet 380V power supply supplies power, and the valve is kept in the original state after power failure.
The output end of the frequency converter 5 comprises a U end, a V end and a W end, the U end, the V end and the W end correspond to a point a, a point b and a point c on an output line, a zero wire is added to form three-phase four wires, and a first breaker 10 is connected to the point a, the point b and the point c on the output line. Points a, b and c on the rear output line of the first circuit breaker 10 and zero wires are correspondingly connected with terminals 1, 5, 9 and 13 of the transfer switch 11.
The 2 and 4 terminals of the change-over switch 11 are short-circuited, the 6 and 8 terminals are short-circuited, the 10 and 12 terminals are short-circuited, and the 14 and 16 terminals are short-circuited and then connected with the wiring terminal of the circuit breaker II 12. Three-phase four-wire low-voltage control power supply of the low-voltage power distribution cabinet entering the check valve control box is connected to terminals 3, 7, 11 and 15 of the change-over switch 11.
The working principle of the utility model is as follows: when the change-over switch 11 turns to 45 degrees on the right side, the 3-4 terminal, the 7-8 terminal, the 11-12 terminal and the 15-16 terminal are respectively connected, and a power supply from the low-voltage power distribution cabinet enters an electric hydraulic control system of the check valve control box. When the change-over switch 11 turns to 45 degrees on the left side, the 1-2 terminal, the 5-6 terminal, the 9-10 terminal and the 13-14 terminal are respectively connected, the power from the frequency converter 5 enters the electric hydraulic control system of the check valve control box, the built-in low-voltage (380V) power supply of the frequency converter 5 is used as the second power supply of the electric hydraulic system of the check valve control box, so that the power supply of the electric hydraulic system of the check valve control box is synchronous with the frequency converter 5, and as long as the frequency converter 5 and the motor 6 normally operate, even if the low-voltage power supply and a circuit are in failure, the normal operation of the water pump unit 1 is not influenced. The check valve 3 is synchronous with the control power supply of the frequency converter 5 and the motor 6, and water supply interruption and motor overload during the faults of the low-voltage power supply and the circuit are avoided. In the electro-hydraulic system of the check valve control box, not only is the oil pump motor load needing a three-phase 380V power supply, but also the control power supply load needing a single-phase 220V power supply exists, so that the extracted power supply is required to be three-phase four-wire to meet the requirements.
The present utility model is not limited to the above embodiments, and any person who can learn the structural changes made under the teaching of the present utility model can fall within the scope of the present utility model if the present utility model has the same or similar technical solutions.
The technology, shape, and construction parts of the present utility model, which are not described in detail, are known in the art.
Claims (6)
1. The motor protection circuit for preventing water supply interruption in the water supply pump station is characterized by comprising a frequency converter and a check valve, wherein the input end of the frequency converter is connected with a high-voltage bus, the output end of the frequency converter is connected with a motor, and a first circuit breaker is arranged at the output end of the frequency converter;
the check valve is connected with the check valve control box, a change-over switch is arranged in the check valve control box, the change-over switch is connected with the output end of the frequency converter through a circuit breaker, and the change-over switch is connected with the internal circuit of the check valve control box through a circuit breaker II.
2. The motor protection circuit for preventing water supply interruption in a water supply pump station according to claim 1, wherein the output end of the frequency converter comprises a U end, a V end and a W end, the U end, the V end and the W end correspond to a point a, a point b and a point c on an output line, and a circuit breaker I is connected to the point a, the point b and the point c on the output line.
3. The motor protection circuit for preventing water supply interruption in a water supply pump station according to claim 2, wherein the point a, the point b, the point c and the zero wire on the output line at the rear part of the circuit breaker are correspondingly connected with terminals 1, 5, 9 and 13 of the transfer switch.
4. The motor protection circuit for preventing water supply interruption in a water supply pump station according to claim 1, wherein the 2 and 4 terminals of the change-over switch are short-circuited, the 6 and 8 terminals are short-circuited, the 10 and 12 terminals are short-circuited, and the 14 and 16 terminals are short-circuited and then connected with the second circuit breaker.
5. The motor protection circuit for preventing water supply interruption in a water supply pump station according to claim 1, wherein the high-voltage bus is further connected with an input end of a pump station transformer, and an output end of the pump station transformer is connected with a low-voltage power distribution cabinet.
6. The motor protection circuit for preventing water supply interruption in a water supply pump station according to claim 5, wherein the three-phase four-wire low-voltage control power supply of the low-voltage power distribution cabinet is connected to terminals 3, 7, 11 and 15 of the change-over switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321745453.8U CN220210013U (en) | 2023-07-05 | 2023-07-05 | Motor protection circuit for preventing water supply interruption in water supply pump station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321745453.8U CN220210013U (en) | 2023-07-05 | 2023-07-05 | Motor protection circuit for preventing water supply interruption in water supply pump station |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220210013U true CN220210013U (en) | 2023-12-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321745453.8U Active CN220210013U (en) | 2023-07-05 | 2023-07-05 | Motor protection circuit for preventing water supply interruption in water supply pump station |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220210013U (en) |
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2023
- 2023-07-05 CN CN202321745453.8U patent/CN220210013U/en active Active
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