CN216794882U - Speed regulator control circuit of hydraulic generator - Google Patents
Speed regulator control circuit of hydraulic generator Download PDFInfo
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- CN216794882U CN216794882U CN202220304337.1U CN202220304337U CN216794882U CN 216794882 U CN216794882 U CN 216794882U CN 202220304337 U CN202220304337 U CN 202220304337U CN 216794882 U CN216794882 U CN 216794882U
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- power supply
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- speed regulator
- control circuit
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Abstract
The utility model relates to a speed regulator control circuit of a hydraulic generator, which comprises a main circuit, a control circuit and an emergency speed regulator closing circuit, wherein the emergency speed regulator closing circuit is interlocked with the main circuit and comprises a fifth contactor and a direct-current power supply, a motor of a speed regulator is connected with a machine end power supply through the fifth contactor, the fifth contactor is powered by the direct-current power supply, the starting condition of the emergency speed regulator closing circuit is that the frequency of the machine end power supply is more than 70Hz, the technical scheme is not influenced by the machine end power supply frequency, the problem of stable speed regulator closing under the condition of large-network jumping is solved, and the reliability of a machine set is improved.
Description
Technical Field
The utility model relates to the field of hydroelectric generation, in particular to a speed regulator control circuit of a hydraulic generator.
Background
The motor power AC380V of the existing manual-electric speed regulator is provided by switching a power grid power supply and a power supply at an end, and the control circuit power AC220V is also provided by switching the power grid power supply and the power supply at the end. Under the condition of large-grid power jump, because the generator and the load are suddenly disconnected under the operation condition, the load of the water turbine is instantaneously reduced, so that the rotating speed of the water turbine is instantaneously increased, and the frequency is correspondingly increased. The coil frequency of the AC contactor is 50Hz, when the frequency is more than 50Hz, the AC contactor cannot act in the frequency increasing process, so that the AC contactor cannot be attracted, the power supply of a motor of the speed regulator is cut off, the speed regulator cannot be normally closed, and finally the runaway accident of the unit is caused.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects of the prior art, the utility model provides a speed regulator control circuit of a hydraulic generator, which can close the speed regulator in an emergency.
The utility model relates to a speed regulator control circuit of a hydraulic generator, which adopts the following technical scheme: it includes:
the main circuit comprises a power grid power supply, a machine end power supply, a third contactor and a fourth contactor, wherein the power grid power supply and the machine end power supply are respectively connected with the third contactor and the fourth contactor in series and then are connected with a motor of the speed regulator through a control circuit;
the control circuit comprises a first contactor, a second contactor, a forward rotation starting button and a reverse rotation starting button, wherein the first contactor is connected to a first series circuit, the second contactor is connected to a second series circuit, and the first series circuit and the second series circuit are connected in parallel and then are respectively connected with the positive pole and the negative pole of a power supply; connecting; the first series circuit is: the forward rotation starting button is connected with the normally open contact of the first contactor in parallel and then is respectively connected with the reverse rotation starting button, the normally closed contact of the second contactor and the first contactor in series; the second series circuit is: the reverse rotation starting button is connected with a normally open contact of the second contactor in parallel and then is respectively connected with the forward rotation starting button, a normally closed contact of the first contactor and the second contactor in series;
the emergency speed-regulating circuit comprises a fifth contactor and a direct-current power supply, a motor of the speed regulator is connected with a machine-end power supply through the fifth contactor, and the fifth contactor is powered by the direct-current power supply.
Further, the starting condition of the emergency cut-off speed regulator circuit is that the frequency of the generator-end power supply is greater than 70 Hz.
Further, the emergency shutdown speed regulator circuit and the main circuit are mechanically interlocked.
Further, the direct current power supply is obtained by switching the switch power supply as an end power supply.
Furthermore, the input voltage range of the switching power supply is AC 100V-400V or DC 90V-350V, and is not limited by frequency.
Compared with the prior art, the utility model has the following beneficial effects: the circuit of the emergency speed regulator is added, a contactor coil of the circuit adopts a DC power supply, and a DC control power supply is supplied by a switching power supply and is not influenced by the frequency of a power supply at the machine end, so that the problem of stable shutdown of the speed regulator under the condition of large-network power jumping is solved, and the reliability of a unit is improved.
Drawings
The accompanying drawings, which are described herein to provide a further understanding of the application, are included in the following description:
FIG. 1 is a circuit of the present invention.
Detailed Description
Referring to fig. 1, a speed regulator control circuit of a hydro-generator according to a first embodiment includes:
the main circuit comprises a power grid power supply, a generator side power supply, a third contactor PQ-1 and a fourth contactor PQ-2, wherein the power grid power supply and the generator side power supply are respectively connected with the third contactor PQ-1 and the fourth contactor PQ-2 in series and then are connected with a motor of the speed regulator through a control circuit, and the third contactor PQ-1 and the fourth contactor PQ-2 are interlocked; the third contactor PQ-1 and the fourth contactor PQ-2 are switched to supply power to the speed regulator motor, and the auxiliary contact connecting switch K20 on the coil of the fourth contactor PQ-2 is switched to supply power to the control circuit;
the control circuit comprises a first contactor PJ-1, a second contactor PJ-2, a forward rotation starting button SBZ and a reverse rotation starting button SBF, wherein the first contactor PJ-1 is connected to a first series circuit, the second contactor PJ-2 is connected to a second series circuit, and the first series circuit and the second series circuit are connected in parallel and then are respectively connected with the positive pole and the negative pole of a power supply; the first series circuit is: the forward rotation starting button SBZ is connected with a normally open contact of the first contactor PJ-1 in parallel and then is respectively connected with the reverse rotation starting button, a normally closed contact of the second contactor PJ-2 and the first contactor PJ-1 in series; the second series circuit is: the reverse rotation starting button is connected with a normally open contact of the second contactor PJ-2 in parallel and then is respectively connected with the forward rotation starting button SBZ, a normally closed contact of the first contactor PJ-1 and the second contactor PJ-2 in series;
the emergency speed-closing circuit is interlocked with the main circuit and comprises a fifth contactor PM1 and a direct-current power supply, a motor of the speed regulator is connected with a machine-end power supply through the fifth contactor PM1, and the fifth contactor PM1 is powered by the direct-current power supply.
Further, the starting condition of the emergency cut-off speed regulator circuit is that the frequency of the generator-end power supply is greater than 70 Hz.
Further, the emergency shutdown speed regulator circuit and the main circuit are mechanically interlocked.
Further, the direct current power supply is obtained by converting an end power supply through a third switch power supply PW.
Furthermore, the input voltage range of the switching power supply PW is AC 100V-400V or DC 90V-350V, and is not limited by frequency.
The working principle of the utility model is as follows:
in the control circuit, a forward rotation starting button SBZ is pressed, a coil of a first contactor PJ-1 is electrified to attract a main contact of the first contactor PJ-1 to be closed and connected with a first series loop power supply, a speed regulator operates in a forward direction, and a normally closed auxiliary contact of the first contactor PJ-1 is disconnected with a circuit of a second contactor PJ-2; a reverse start button SBF is pressed, a coil of a second contactor PJ-2 is electrified to attract a main contact of the second contactor PJ-2 to be closed and connected with a power supply of a second series loop, a speed regulator runs in a reverse direction, and a normally closed auxiliary contact of the second contactor PJ-2 disconnects a circuit of a first contactor PJ-1, so that the contactor KM1 and the contactor KM2 are interlocked;
under the condition of large-network power supply jumping, because the generator and the load are suddenly disconnected under the operation condition, the load of the water turbine is instantaneously reduced, so that the rotating speed of the water turbine is instantaneously increased, and the power supply frequency at the generator end is correspondingly increased. At the moment, the coil frequency of the third contactor PQ-1 and the fourth contactor PQ-2 is greater than 50Hz, when the coil frequency is greater than 50Hz, namely the coil frequency is not operated, the third contactor PQ-1 and the fourth contactor PQ-2 cannot be attracted, the power supply of the speed regulator motor is cut off, the speed regulator closing process cannot be normally executed, the starting of the speed regulator circuit is emergently closed, the fifth contactor PM1 is connected with the power supply at the machine end to supply power to the speed regulator motor, and the fifth contactor PM1 is obtained by switching the power supply at the machine end through the third switch power supply PW and is not limited by the frequency of the power supply at the machine end.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. A hydro-generator governor control circuit comprising:
the main circuit comprises a power grid power supply, a machine end power supply, a third contactor and a fourth contactor, wherein the power grid power supply and the machine end power supply are respectively connected with the third contactor and the fourth contactor in series and then are connected with a motor of the speed regulator through a control circuit;
the control circuit comprises a first contactor, a second contactor, a forward rotation starting button and a reverse rotation starting button, wherein the first contactor is connected to a first series circuit, the second contactor is connected to a second series circuit, and the first series circuit and the second series circuit are connected in parallel and then are respectively connected with the positive pole and the negative pole of a power supply; the first series circuit is: the forward rotation starting button is connected with the normally open contact of the first contactor in parallel and then is respectively connected with the reverse rotation starting button, the normally closed contact of the second contactor and the first contactor in series; the second series circuit is: the reverse rotation starting button is connected with a normally open contact of the second contactor in parallel and then is respectively connected with the forward rotation starting button, a normally closed contact of the first contactor and the second contactor in series;
the method is characterized in that: the emergency speed-regulating circuit comprises a fifth contactor and a direct-current power supply, a motor of the speed regulator is connected with a machine-end power supply through the fifth contactor, and the fifth contactor is powered by the direct-current power supply.
2. The hydro-generator governor control circuit of claim 1 wherein: the starting condition of the emergency speed-regulating cut-off circuit is that the frequency of a generator-end power supply is greater than 70 Hz.
3. The hydro-generator governor control circuit of claim 1 wherein: the emergency speed-regulating cut-off circuit and the main circuit are mechanically interlocked.
4. The hydro-generator governor control circuit of claim 1 wherein: the direct current power supply is obtained by switching a switch power supply.
5. The hydro-generator governor control circuit of claim 4 wherein: the input voltage range of the switching power supply is AC 100V-400V or DC 90V-350V, and is not limited by frequency.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220304337.1U CN216794882U (en) | 2022-02-15 | 2022-02-15 | Speed regulator control circuit of hydraulic generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220304337.1U CN216794882U (en) | 2022-02-15 | 2022-02-15 | Speed regulator control circuit of hydraulic generator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216794882U true CN216794882U (en) | 2022-06-21 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220304337.1U Active CN216794882U (en) | 2022-02-15 | 2022-02-15 | Speed regulator control circuit of hydraulic generator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216794882U (en) |
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2022
- 2022-02-15 CN CN202220304337.1U patent/CN216794882U/en active Active
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