CN212034015U - Auxiliary power supply excitation circuit for brush synchronous generator excitation device - Google Patents
Auxiliary power supply excitation circuit for brush synchronous generator excitation device Download PDFInfo
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- CN212034015U CN212034015U CN202021001291.3U CN202021001291U CN212034015U CN 212034015 U CN212034015 U CN 212034015U CN 202021001291 U CN202021001291 U CN 202021001291U CN 212034015 U CN212034015 U CN 212034015U
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Abstract
The utility model discloses an auxiliary power source excitation circuit for having brush synchronous generator excitation device, including generator excitation winding, a excitation DC power source passes through contactor connection generator excitation winding, and an auxiliary relay is connected contactor solenoid control opening of contactor opens and stops, and opening of an excitation regulation controller connection auxiliary relay solenoid control auxiliary relay opens and stops, and the output voltage of synchronous generator excitation device and generator is connected to excitation regulation controller to monitor the output voltage of generator, concatenate a forward diode in excitation DC power source positive pole and generator excitation winding one end, concatenate a backward diode between forward diode's negative pole and the excitation DC power source negative pole and be used for generator excitation winding's afterflow. The utility model discloses simple structure has overcome because of excitation regulator internal power module output load is too big, leads to excitation regulator internal power module to damage.
Description
Technical Field
The utility model relates to an auxiliary power supply excitation circuit for brush synchronous generator excitation device.
Background
The generator excitation system is a device for providing direct current power supply to the excitation winding of the generator rotor. When excitation is started, the excitation starting switching contactor is closed, an excitation starting power supply is sent to a generator rotor, the voltage at the generator end gradually rises, after the voltage at the generator end rises to a certain value, the excitation starting switching contactor is disconnected, the excitation starting power supply is cut off, a power loop is triggered to finish excitation starting voltage building, and the excitation device is put into operation. However, the conventional auxiliary power supply excitation circuit has a complex structure and poor reliability, and cannot well realize reliable voltage build-up of a generator set; on the other hand, when the excitation switching contactor is attracted, the internal power supply module of the excitation regulator is damaged due to overlarge output load of the internal power supply module of the excitation regulator.
Disclosure of Invention
The utility model aims at providing an auxiliary power source excitation circuit for having brush synchronous generator excitation device realizes that the generator set reliably builds the pressure to when solving because of the excitation switching contactor inhales, because of excitation regulator internal power module output load is too big, lead to the problem that excitation regulator internal power module damaged.
In order to achieve the purpose, the technical scheme of the invention is as follows: an auxiliary power supply excitation circuit for an excitation device of a brushed synchronous generator comprises an excitation winding of the generator, an excitation direct-current power supply is connected with the excitation winding of the generator through a contactor, an intermediate relay is connected with an electromagnetic coil of the contactor to control the starting and stopping of the contactor, an excitation adjusting controller is connected with the electromagnetic coil of the intermediate relay to control the starting and stopping of the intermediate relay, the excitation adjusting controller is connected with the excitation device of the synchronous generator and the output voltage of the generator and monitors the output voltage of the generator, a forward diode is connected between the anode of the excitation direct-current power supply and the excitation winding of the generator in series, and a backward diode is connected between the cathode of the forward diode and the cathode of the excitation direct-current power supply in series and used for follow current of the excitation.
The scheme is further as follows: and two ends of the electromagnetic coil of the intermediate relay are connected with freewheeling diodes.
The scheme is further as follows: the excitation adjusting controller is a PLC programmable controller.
The scheme is further as follows: the excitation starting direct-current power supply is a 220V or 110V direct-current power supply, a resistor is connected between the positive electrode of the 220V or 110V direct-current power supply and the positive electrode of the forward diode in series, and the resistor is used for determining the excitation starting current of the excitation winding of the generator.
The utility model has the advantages that: the structure is simple, and the reliable voltage build-up of the generator set can be realized. The excitation regulator directly sends a control signal to the control coil of the excitation switching contactor, the control signal sent by the excitation regulator is changed into the control signal sent by the excitation regulator to the control coil of the intermediate relay, and then the control coil of the excitation switching contactor is sent by a pair of normally open contacts of the intermediate relay, so that the phenomenon that when the excitation switching contactor is attracted, the internal power supply module of the excitation regulator is damaged due to overlarge output load of the internal power supply module of the excitation regulator is avoided.
Drawings
Fig. 1 is a schematic diagram of the circuit principle of the present invention.
Detailed Description
An auxiliary power excitation circuit for an excitation device of a brushed synchronous generator is disclosed, as shown in fig. 1, the auxiliary power excitation circuit comprises an excitation winding 101 of a generator 1, a direct current 220 or 110V excitation direct current power supply is connected with the excitation winding 101 of the generator through a contactor 2, contacts of the contactor 2 are in a disconnected state in the figure, wherein an intermediate relay 3 is connected with an electromagnetic coil 201 of the contactor to control the on-off of the contactor 2, an excitation regulation controller 4 is connected with an electromagnetic coil 301 of the intermediate relay to control the on-off of the intermediate relay 3, the excitation regulation controller 4 is simultaneously connected with an excitation device 5 of the synchronous generator and an output voltage 6 of the generator and monitors the output voltage of the generator, the output voltage of the generator is simultaneously connected with the excitation device 5 of the synchronous generator, and a rectification circuit is arranged in the excitation device 5 of the synchronous generator, the direct current voltage output by the rectifying circuit is used for outputting exciting current to the exciting winding 101 after the excitation circuit is disconnected, the positive pole of a forward diode D1 is connected in series between the positive pole of the excitation direct current power supply and one end of the generator exciting winding, and a backward diode D2 is connected in series between the negative pole of the forward diode D1 and the negative pole of the excitation direct current power supply and used for afterflow of the generator exciting winding, namely: the negative electrode of the backward diode D2 is connected with the negative electrode of the forward diode D1, and the positive electrode of the backward diode D2 is connected with the negative electrode of the excitation direct-current power supply. The forward diode D1 and the backward diode D2 form an excitation diode module for preventing the generator field winding from charging backward to the excitation dc power supply and for freewheeling the generator field winding.
After the generator is started, the excitation regulation controller 4 firstly switches on the intermediate relay 3 to start the contactor 2, the excitation direct current power supply is connected with the generator excitation winding to generate excitation, the voltage of the generator end gradually rises along with the access of the excitation current, the excitation regulation controller 4 monitors the output voltage of the generator, when the output voltage of the generator reaches a set value, the output voltage of the generator at the moment enables the motor excitation device 5 to start working to generate excitation voltage, the excitation regulation controller controls to stop the intermediate relay 3 to work, the contactor power supply is cut off to disconnect the excitation direct current power supply from the generator excitation winding, the synchronous generator excitation device is switched on to be connected with the generator excitation winding, and the generator works normally.
In the examples: a freewheeling diode D3 is connected to both ends of the intermediate relay electromagnetic coil to prevent reverse voltage generated when the intermediate relay electromagnetic coil is de-energized from damaging the intermediate relay electromagnetic coil.
The excitation regulating controller in this embodiment is a PLC programmable controller, and can be directly programmed.
In the examples: the excitation starting direct-current power supply is a 220V or 110V direct-current power supply, a resistor R is connected between the positive electrode of the 220V or 110V direct-current power supply and the positive electrode of the forward diode in series, and the resistor R is used for adjusting and determining the excitation starting current of the excitation winding of the generator and plays a role in limiting current. A manual thermal switch QF is arranged in an excitation starting direct-current power supply output loop of direct current 220 or 110V and is used for manually controlling whether auxiliary power supply excitation is carried out or not, and operation of the circuit is facilitated.
Claims (4)
1. An auxiliary power supply excitation circuit for an excitation device of a brushed synchronous generator comprises an excitation winding of the generator, and an excitation direct-current power supply is connected with the excitation winding of the generator through a contactor.
2. The auxiliary power supply excitation circuit according to claim 1, wherein a freewheeling diode is connected to both ends of the intermediate relay electromagnetic coil.
3. The auxiliary power supply excitation circuit according to claim 1, wherein the excitation adjustment controller is a PLC programmable controller.
4. The auxiliary power supply excitation circuit according to claim 1, wherein the excitation direct current power supply is a 220 v or 110 v direct current power supply, and a resistor is connected in series between the positive pole of the 220 v or 110 v direct current power supply and the positive pole of the forward diode, and the resistor is used for determining the excitation current of the generator excitation winding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021001291.3U CN212034015U (en) | 2020-06-04 | 2020-06-04 | Auxiliary power supply excitation circuit for brush synchronous generator excitation device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021001291.3U CN212034015U (en) | 2020-06-04 | 2020-06-04 | Auxiliary power supply excitation circuit for brush synchronous generator excitation device |
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| Publication Number | Publication Date |
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| CN212034015U true CN212034015U (en) | 2020-11-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN202021001291.3U Active CN212034015U (en) | 2020-06-04 | 2020-06-04 | Auxiliary power supply excitation circuit for brush synchronous generator excitation device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114263528A (en) * | 2021-11-25 | 2022-04-01 | 潍柴动力股份有限公司 | System and method for removing condensation in generator set and generator set |
| CN115694274A (en) * | 2022-03-21 | 2023-02-03 | 中建八局第二建设有限公司 | Method for improving excitation mode of data center generator set |
-
2020
- 2020-06-04 CN CN202021001291.3U patent/CN212034015U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114263528A (en) * | 2021-11-25 | 2022-04-01 | 潍柴动力股份有限公司 | System and method for removing condensation in generator set and generator set |
| CN114263528B (en) * | 2021-11-25 | 2023-03-21 | 潍柴动力股份有限公司 | System and method for removing condensation in generator set and generator set |
| CN115694274A (en) * | 2022-03-21 | 2023-02-03 | 中建八局第二建设有限公司 | Method for improving excitation mode of data center generator set |
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