CN214480355U - Power supply fault rapid isolation and protection device with brake load protection function and permanent magnet synchronous generator set thereof - Google Patents
Power supply fault rapid isolation and protection device with brake load protection function and permanent magnet synchronous generator set thereof Download PDFInfo
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- CN214480355U CN214480355U CN202022769438.XU CN202022769438U CN214480355U CN 214480355 U CN214480355 U CN 214480355U CN 202022769438 U CN202022769438 U CN 202022769438U CN 214480355 U CN214480355 U CN 214480355U
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Abstract
The utility model provides a power supply fault rapid isolation and protection device with a braking load protection function, wherein a common energy consumption resistor of a load resistance box unit is connected with a converter monitoring unit, and a braking resistor is connected with a braking circuit protection unit; the rectification inversion module of the converter monitoring unit is used for monitoring the state of the generator converter and controlling the opening and closing of the machine side circuit breaker and the network side circuit breaker according to the state, and the machine side circuit breaker and the network side circuit breaker are used for controlling the on-off of a circuit; the circuit access component of the brake circuit protection unit is connected with the converter monitoring unit, the relay is connected with the circuit access component according to the converter monitoring unit, the brake circuit breaker is connected with the relay, the main circuit inlet end of the brake circuit breaker is connected with the generator, and the main circuit outlet end of the brake circuit breaker is connected with the brake resistor of the load resistor box unit. The utility model discloses refuse the switch-on power supply when the converter trouble to switch over to the braking circuit and unload, make safety protection perfect more, reliable.
Description
Technical Field
The utility model belongs to the technical field of electric power system automation, specifically, relate to a power supply fault is kept apart fast and protection device and permanent magnet synchronous generator set with braking load protect function.
Background
The output voltage of the permanent magnet synchronous generator exceeds the rated voltage as long as the rotating speed exceeds the rated rotating speed, and the higher the rotating speed is, the higher the voltage is. In order to prevent the generator and the load from being damaged due to overhigh voltage, the rotating speed of the permanent magnet synchronous generator needs to be controlled, and the flying is prevented by means of faster response speed.
The existing power protector can play a certain role of protecting equipment when an electrified circuit is in fault, but passive mechanical protection is generally adopted, namely after the power protector is required to be connected to electrify a load, a current transformer is used for detecting the current condition in the load or a power line to detect and judge and then drive a power switch to act. However, compared with the prior art, the protector does not have the function of rapid isolation and protection for the line disconnection time of the system, and cannot protect system equipment in time.
The load resistor needs to continuously adjust the actually input power according to a preset power value in the operation process, and also needs to monitor the operation state in real time, so that the load resistor is maintained in time when a fault occurs, and therefore, the real-time operation parameters of the resistor need to be monitored by adopting a measurement and control device. The current measurement and control system of the load resistor controls the loading and unloading of loads at various gears by components such as a relay, a contactor, a button, a switch and the like, and the measurement and control system can only meet some basic test functions.
SUMMERY OF THE UTILITY MODEL
The utility model discloses to the above-mentioned not enough that exists among the prior art, provide a power supply fault quick isolation and protection device with braking load protect function, provide a power supply fault quick isolation and protection method with braking load protect function simultaneously and based on the permanent magnet synchronous generator set that power supply fault quick isolation and protection device with braking load protect function realized.
The utility model discloses a realize through following technical scheme.
According to one aspect of the utility model, a power supply fault rapid isolation and protection device with a brake load protection function is provided, which comprises a load resistance box unit, a converter monitoring unit and a brake circuit protection unit; wherein:
the load resistance box unit comprises a common energy consumption resistor and a brake resistor; the common energy consumption resistor is connected with the converter monitoring unit, and the brake resistor is connected with the brake circuit protection unit;
the converter monitoring unit comprises a rectification inversion module, a machine side circuit breaker and a network side circuit breaker, wherein the rectification inversion module is used for monitoring the state of the generator converter and controlling the machine side circuit breaker and the network side circuit breaker to be opened and closed according to the state, and the machine side circuit breaker and the network side circuit breaker are used for controlling the on-off of a circuit;
the brake circuit protection unit comprises a brake circuit breaker, a circuit access component, a relay and a switch, wherein the circuit access component is connected with the converter monitoring unit, the relay is connected with the circuit access component according to the converter monitoring unit, the brake circuit breaker is connected with the relay, a main circuit wire inlet end of the brake circuit breaker is connected with the generator, and a main circuit wire outlet end of the brake circuit breaker is connected with a brake resistor of the load resistor box unit.
Preferably, for the condition of high-load operation of the generator, when a converter fails, the converter monitoring unit controls the machine-side circuit breaker and the grid-side circuit breaker to be disconnected, and at the moment, the load resistance box unit is cut off from a circuit system; meanwhile, the converter monitoring unit controls the circuit access part to be switched on, so that the intermediate relay is closed, the load resistance box unit is put into the circuit system again, and at the moment, the brake resistor in the load resistance box unit is put into operation to absorb the electric energy of the generator.
Preferably, the circuit access component adopts an alarm indicator lamp.
Preferably, the brake chopper current is 1250A.
Preferably, the outer diameter of a cable connected between the main circuit wire inlet end of the brake circuit breaker and the generator is 240mm2。
Preferably, the outer diameter of a cable connected between a main loop outlet end of the brake circuit breaker and the brake resistor of the load resistor box unit is 240mm2。
According to another aspect of the present invention, there is provided an isolation and protection method for a power supply fault rapid isolation and protection device with a braking load protection function, comprising:
monitoring the state of a generator converter in real time by adopting a rectification inversion module of a converter monitoring unit; when the acquired converter state is a converter fault, the converter monitoring unit controls the machine side circuit breaker and the network side circuit breaker to be disconnected, and at the moment, the load resistance box unit is cut off from the circuit system; meanwhile, the converter monitoring unit controls the circuit access part to be switched on, so that the intermediate relay is closed, the load resistance box unit is switched into the circuit system again, and at the moment, the brake resistor in the load resistance box unit is switched into operation to absorb the electric energy of the generator.
According to the utility model discloses a third aspect provides a permanent magnet synchronous generator set, including permanent magnet synchronous generator and the above-mentioned arbitrary item of being connected with permanent magnet synchronous generator power supply fault with braking load protect function keep apart fast and protection device.
Since the technical scheme is used, compared with the prior art, the utility model, have following beneficial effect:
the utility model provides a power supply fault keeps apart fast and protection device with braking load protect function, a method, before the closed power supply of circuit protection unit, the converter state of converter monitoring unit monitoring generator, whether there is overload, the too high state of rotational speed, if above-mentioned hidden danger appears, then the corresponding control signal of converter monitoring unit output to microprocessor, the machine side of disconnection, the net side circuit breaker, braking circuit protection unit intercommunication, fault indication and warning can be made simultaneously, only can realize the switch-on of main switch after getting rid of hidden danger, thereby provide more convenience for generating set, safe protection device.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
fig. 1 is a schematic circuit diagram of a power supply fault fast isolating and protecting device with a braking load protecting function according to a preferred embodiment of the present invention.
Detailed Description
The following is a detailed description of embodiments of the present invention: this embodiment is using the utility model discloses technical scheme carries out under the prerequisite, has given detailed implementation mode and specific operation process. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention.
An embodiment of the utility model provides a power supply fault is kept apart fast and protection device with braking load protect function. The direct reason that the generator is overspeed is that the electric energy of the generator is not safely released, and the power supply fault quick isolation and protection device with the braking load protection function provided by the embodiment can add a braking resistor to the generator to safely release the electric energy of the generator. When the converter is connected to supply power, the state of the generator can be detected, whether the states of overload, over-high rotating speed and the like exist is judged, if yes, the converter refuses to be connected to supply power, and the converter is switched to a braking circuit to unload, so that the safety protection is more perfect and reliable.
Fig. 1 is a schematic circuit diagram of a power supply fault fast isolating and protecting device with a braking load protecting function according to a preferred embodiment of the present invention.
Referring to fig. 1, the present embodiment provides a power supply fault fast isolating and protecting apparatus with a braking load protection function, including: the device comprises a load resistance box unit, a current transformer monitoring unit and a brake circuit protection unit; wherein:
the load resistance box unit comprises a common energy consumption resistor and a brake resistor; the common energy consumption resistor is connected with the converter monitoring unit, and the brake resistor is connected with the brake circuit protection unit;
the converter monitoring unit comprises a rectification inversion module, a machine side circuit breaker and a network side circuit breaker, wherein the rectification inversion module is used for monitoring the state of the generator converter and controlling the machine side circuit breaker and the network side circuit breaker to be opened and closed according to the state, and the machine side circuit breaker and the network side circuit breaker are used for controlling the on-off of a circuit;
the brake circuit protection unit comprises a brake circuit breaker, a circuit access component, a relay and a switch, wherein the circuit access component is connected with the converter monitoring unit, the relay is connected with the circuit access component, the brake circuit breaker is connected with the relay, a main circuit wire inlet end of the brake circuit breaker is connected with the generator, and a main circuit wire outlet end of the brake circuit breaker is connected with a brake resistor of the load resistor box unit.
As a preferred embodiment, in the case of high-load operation of the generator, when the converter fails, the converter monitoring unit controls the machine-side circuit breaker and the grid-side circuit breaker to be disconnected, and at this time, the load resistance box unit is cut off from the circuit system; meanwhile, the converter monitoring unit controls the circuit access part to be switched on, so that the intermediate relay is closed, the load resistance box unit is put into the circuit system again, and at the moment, the brake resistor in the load resistance box unit is put into operation to absorb the electric energy of the generator.
As a preferred embodiment, the circuit access component adopts an alarm indicator lamp.
As a preferred embodiment, the brake chopper current is 1250A.
As a preferred embodiment, the outer diameter of a cable connected between the main circuit wire inlet end of the brake circuit breaker and the generator is 240mm2。
As a preferred embodiment, the outer diameter of a cable connected between a main loop outlet end of the brake circuit breaker and the brake resistor of the load resistor box unit is 240mm2。
As shown in fig. 1, in the power supply fault fast isolating and protecting device with a braking load protection function provided in this embodiment, under a system fault condition, the breaker control unit controls each incoming line switch and outgoing line switch to implement fault fast isolating and communicates with a braking load to implement a protection function. The embodiment can realize the quick isolation of the fault line and effectively improve the reliability and stability of power supply.
In the load resistance box unit, a common energy consumption resistor is connected with the converter monitoring unit, and a brake resistor in the load resistance box unit is connected with the brake circuit protection unit; in the brake circuit protection unit, a brake protection circuit contactor KA3 is controlled to be attracted and disconnected through brake circuit converter open circuit alarm output terminals 1 and 2; in the converter monitoring unit, a rectification inversion module is responsible for monitoring the state of a generator, and the circuit breakers on the machine side and the network side control the on-off of a converter monitoring unit circuit.
The converter monitoring module continuously monitors the voltage of the generator, and the converter is in fault shutdown and lights a fault indicator lamp HL1 on the converter cabinet door when the voltage of the generator exceeds a protection value. The coil of the intermediate relay KA1 can be wired from the terminal of the converter fault indicator lamp HL1, and KA3 also attracts when HL1 lights up.
A brake circuit breaker QS3 is controlled to start and stop by KA1, and the brake circuit breaker QS3 is referenced to current 1250A. From generator motor line (reference cable external diameter 240 mm)2) In addition, a group of cables are connected to the main loop inlet end of a brake circuit breaker QS3, and the main loop outlet end of the brake circuit breaker QS3 is connected with a field load box (the outer diameter of the reference cable is 240 mm)2)。
When the generator runs under high load, if a converter fault caused by the fact that the voltage of the generator exceeds a protection value or other reasons occurs, the converter can immediately disconnect a machine side breaker QS2 and a net side breaker QS1 and light a fault indicator lamp, a load box is cut off from the system, QS3 is attracted, the load box is put into operation again, and the function of the load box is changed from normal load to brake resistance at the moment. The whole process of changing from the load box to the braking resistor can be completed within 1 second, and then the braking resistor absorbs the electric energy of the generator. When the converter fails, the load resistance is large, the brake resistance is large, and manual intervention is not needed. Therefore, the electric energy of the generator can be continuously and effectively and safely released, the expander control system also receives the fault signal of the converter to enter a shutdown state, and the rotating speed of the generator cannot be continuously increased so as to fly.
When the generator stops, the converter is reset manually, the converter fault indicator lamp HL1 is turned off, the brake resistor is withdrawn, and the restarting is not influenced.
No matter whether the generator is operated or not, the brake resistor can be put into use as long as the converter fails, and the generator can be started only by eliminating the fault of the converter.
The utility model discloses another embodiment provides the isolation and the protection method of the power supply fault quick isolation and protection device that have braking load protect function that provide in any above-mentioned embodiment, include:
monitoring the state of a generator converter in real time by adopting a rectification inversion module of a converter monitoring unit; when the acquired converter state is a converter fault, the converter monitoring unit controls the machine side circuit breaker and the network side circuit breaker to be disconnected, and at the moment, the load resistance box unit is cut off from the circuit system; meanwhile, the converter monitoring unit controls the circuit access part to be switched on, so that the intermediate relay is closed, the load resistance box unit is switched into the circuit system again, and at the moment, the brake resistor in the load resistance box unit is switched into operation to absorb the electric energy of the generator.
The utility model discloses the third embodiment provides a permanent magnet synchronous generator set, including permanent magnet synchronous generator and the power supply trouble that provides in the above-mentioned arbitrary embodiment of being connected with permanent magnet synchronous generator and have braking load protect function keep apart fast and protection device.
The output voltage of the permanent magnet synchronous generator exceeds the rated voltage as long as the rotating speed exceeds the rated rotating speed, and the higher the rotating speed is, the higher the voltage is. In order to prevent the generator and the load from being damaged due to high voltage, the rotating speed of the permanent magnet synchronous generator needs to be controlled. The direct reason that the generator hypervelocity is that the electric energy of generator does not have the safety release, the utility model discloses the power supply trouble quick isolation and protection device, the method with braking load protect function that above-mentioned embodiment provided can add a brake resistance for the generator, the electric energy of safety release generator. When the converter monitoring unit is connected to supply power, the converter state of the generator can be detected, whether the generator has states of overload, over-high rotating speed and the like is judged, if yes, the converter refuses to be connected to supply power, and the converter is switched to a braking circuit to unload, so that the safety protection is more perfect and reliable.
It should be noted that, the steps in the method provided by the present invention can be implemented by using corresponding modules, devices, units, etc. in the system, and those skilled in the art can refer to the technical scheme of the system to implement the step flow of the method, that is, the embodiment in the system can be understood as a preferred example of the implementation method, and details are not described herein.
The foregoing description of the specific embodiments of the invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes and modifications may be made by those skilled in the art within the scope of the appended claims without departing from the spirit of the invention.
Claims (6)
1. A power supply fault rapid isolation and protection device with a braking load protection function is characterized by comprising a load resistance box unit, a current transformer monitoring unit and a braking circuit protection unit; wherein:
the load resistance box unit comprises a common energy consumption resistor and a brake resistor; the common energy consumption resistor is connected with the converter monitoring unit, and the brake resistor is connected with the brake circuit protection unit;
the converter monitoring unit comprises a rectification inversion module, a machine side circuit breaker and a network side circuit breaker, wherein the rectification inversion module is used for monitoring the state of the generator converter and controlling the machine side circuit breaker and the network side circuit breaker to be opened and closed according to the state, and the machine side circuit breaker and the network side circuit breaker are used for controlling the on-off of a circuit;
the brake circuit protection unit comprises a brake circuit breaker, a circuit access component, a relay and a switch, wherein the circuit access component is connected with the converter monitoring unit, the relay is connected with the circuit access component, the brake circuit breaker is connected with the relay, a main circuit wire inlet end of the brake circuit breaker is connected with the generator, and a main circuit wire outlet end of the brake circuit breaker is connected with a brake resistor of the load resistor box unit.
2. The power supply fault rapid isolation and protection device with brake load protection function according to claim 1, wherein the circuit access component adopts an alarm indicator lamp.
3. The power supply fault rapid isolation and protection device with brake load protection function according to claim 1, wherein the brake breaker current is 1250A.
4. The power supply fault rapid isolation and protection device with brake load protection function according to claim 1, wherein the outer diameter of the cable connected between the main loop inlet end of the brake circuit breaker and the generator is 240mm2。
5. The power supply fault rapid isolation and protection device with brake load protection function as claimed in claim 1, wherein the outer diameter of the cable connected between the main loop outlet end of the brake circuit breaker and the brake resistor of the load resistor box unit is 240mm2。
6. A permanent magnet synchronous generator set, characterized in that, it comprises a permanent magnet synchronous generator and a power supply failure rapid isolation and protection device with brake load protection function of claim 1 connected with the permanent magnet synchronous generator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022769438.XU CN214480355U (en) | 2020-11-26 | 2020-11-26 | Power supply fault rapid isolation and protection device with brake load protection function and permanent magnet synchronous generator set thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022769438.XU CN214480355U (en) | 2020-11-26 | 2020-11-26 | Power supply fault rapid isolation and protection device with brake load protection function and permanent magnet synchronous generator set thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214480355U true CN214480355U (en) | 2021-10-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022769438.XU Active CN214480355U (en) | 2020-11-26 | 2020-11-26 | Power supply fault rapid isolation and protection device with brake load protection function and permanent magnet synchronous generator set thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214480355U (en) |
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2020
- 2020-11-26 CN CN202022769438.XU patent/CN214480355U/en active Active
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