CN220754679U - Excitation system de-excitation loop of generator set - Google Patents
Excitation system de-excitation loop of generator set Download PDFInfo
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- CN220754679U CN220754679U CN202322342846.0U CN202322342846U CN220754679U CN 220754679 U CN220754679 U CN 220754679U CN 202322342846 U CN202322342846 U CN 202322342846U CN 220754679 U CN220754679 U CN 220754679U
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- 230000005284 excitation Effects 0.000 title claims abstract description 61
- 230000021715 photosynthesis, light harvesting Effects 0.000 claims abstract description 38
- 230000008033 biological extinction Effects 0.000 claims abstract description 20
- 238000001514 detection method Methods 0.000 claims abstract description 12
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 8
- 239000011787 zinc oxide Substances 0.000 claims description 4
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 3
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 3
- 238000000034 method Methods 0.000 claims 1
- 239000004065 semiconductor Substances 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 230000001960 triggered effect Effects 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Abstract
The utility model discloses a field system de-excitation loop of a generator set, which comprises a primary excitation power supply, a field switch, an energy dissipation device, a trigger module and a generator rotor, wherein the primary excitation power supply is connected with the primary excitation power supply; the generator set excitation system de-excitation loop further comprises a first thyristor, a second thyristor and a third thyristor; the positive pole of the primary excitation power supply is respectively and electrically connected with one end of the energy dissipation device and the positive pole of the generator rotor, and a plurality of magnetic extinction switches are arranged between the junction of the connecting end of the energy dissipation device and the positive pole of the generator rotor and the positive pole of the primary excitation power supply; the other end of the energy dissipation device is electrically connected with the positive electrode of the detection end of the trigger module, the positive electrode of the first thyristor, the negative electrode of the second thyristor and the negative electrode of the third thyristor respectively; the trigger end of the trigger module is electrically connected with the G poles of the first thyristor, the second thyristor and the third thyristor respectively. The utility model effectively avoids false generation of overvoltage signals when the generator set is normally stopped and inverted.
Description
Technical Field
The utility model belongs to the technical field of generator excitation loop control, and particularly relates to a de-excitation loop of a generator set excitation system.
Background
The field-weakening technology is applied to the situation that when a short-circuit accident occurs in the generator or between the main transformer of the generator and the generator end to the generator or the load switch, the relay protection trips, and meanwhile, the field-weakening system is started to cut off the excitation power supply of the generator and consume the energy stored by the excitation winding as soon as possible, so that the rotor current is attenuated as soon as possible, the electromotive force and the short-circuit current of the generator are reduced rapidly, and the possibility that the short-circuit current causes insulation burnout, conductor melting or iron core burnout and other generator, transformer damage or accident expansion is reduced.
When an electric accident occurs to the generator, the generator protection device starts an outlet to act, and rapidly turns off a magnetic extinction switch on a generator rotor loop, and at the moment, strong magnetic field energy still exists on the generator rotor (large inductance), and the rotor loop generates very high reverse voltage, such as the rotor energy cannot be released in time, so that the insulation safety of the generator rotor can be influenced. In order to eliminate the strong magnetic field energy of the generator rotor and further reduce the voltage of the generator rotor, a device for transferring the magnetic field energy of the generator rotor, namely a rotor de-excitation device, is designed on a generator rotor loop. At present, in a power plant where the inventor is located, an excitation system de-excitation overvoltage reverse loop of a generator set consists of a diode and a jumper, wherein the diode is not controlled by the jumper circuit, and an overvoltage signal can be wrongly sent out when the generator set is normally shut down and inverted every time because the excitation variable voltage of the generator set is close to the voltage sensitive voltage of de-excitation overvoltage zinc oxide, so that judgment of operators is affected.
According to the utility model, the diodes in the de-excitation overvoltage reverse loop of the original generator set excitation system are replaced by two thyristors, so that false generation of overvoltage signals during normal shutdown and inversion of the generator set is effectively avoided.
Disclosure of Invention
The utility model aims to solve the technical problem of providing a field-effect-eliminating circuit of a generator set excitation system, which effectively avoids false generation of overvoltage signals when the generator set is normally stopped and inverted.
In order to solve the technical problems, the utility model adopts the following technical scheme:
a field-eliminating loop of a generator set excitation system comprises a primary excitation power supply, a field-eliminating switch, an energy-dissipating device, a trigger module and a generator rotor; the distinguishing features are that: the generator set excitation system de-excitation loop further comprises a first thyristor, a second thyristor and a third thyristor; the positive pole of the primary excitation power supply is respectively and electrically connected with one end of the energy dissipation device and the positive pole of the generator rotor, and a plurality of magnetic extinction switches are arranged between the junction of the connecting end of the energy dissipation device and the positive pole of the generator rotor and the positive pole of the primary excitation power supply; the other end of the energy dissipation device is electrically connected with the positive electrode of the detection end of the trigger module, the positive electrode of the first thyristor, the negative electrode of the second thyristor and the negative electrode of the third thyristor respectively; the triggering end of the triggering module is electrically connected with the G poles of the first thyristor, the second thyristor and the third thyristor respectively; the negative electrode of the detection end of the trigger module, the negative electrode of the first thyristor, the positive electrode of the second thyristor and the positive electrode of the third thyristor are electrically connected with the negative electrode of the primary excitation power supply; the negative pole of the generator rotor is electrically connected with the negative pole of the primary excitation power supply.
Further, the triggering module comprises a first relay K1, a second relay K2 and a third relay K3; the coil anodes of the first relay K1, the second relay K2 and the third relay K3 are respectively and electrically connected with the anode of the primary excitation power supply, the coil cathodes of the first relay K1, the second relay K2 and the third relay K3 are respectively and electrically connected with the cathode of the primary excitation power supply, the common end of the first relay K1, the common end of the second relay K2 and the common end of the third relay K3 are respectively and electrically connected with the cathode of the primary excitation power supply, and the normally open ends of the first relay K1, the second relay K2 and the third relay K3 are respectively and electrically connected with the G poles of the third thyristor, the second thyristor and the first thyristor; and a magnetic extinction switch opening position contact is arranged between the coil positive poles of the first relay and the second relay and the positive pole of the primary excitation power supply.
Further, two ends of the energy dissipation device are connected with a resistor R71 in parallel.
Further, the energy dissipation device is connected in series with a shunt, and the energy dissipation device and the shunt are connected in parallel with the resistor R71.
Further, the energy dissipation device is a zinc oxide de-excitation resistor or a silicon carbide de-excitation resistor.
Further, a current transformer is connected between the junction point of the cathode of the first thyristor, the anode of the second thyristor, the anode of the third thyristor and the cathode of the detection end of the trigger module and the cathode of the primary excitation power supply, and the current transformer is connected with the generator rotor in parallel.
Furthermore, a magnetic extinction switch is arranged between the connecting end of the current transformer and the negative electrode junction point of the generator rotor and the negative electrode of the primary excitation power supply.
The beneficial effects of the utility model are as follows:
the detection end of the trigger module is used for detecting whether the loop of the generator rotor is forward voltage or reverse voltage, and when the generator normally operates, the trigger module detects that the generator rotor has forward overvoltage; when the generator fails, the magnetic extinction switch is disconnected, and when the trigger module detects that reverse overvoltage occurs on the generator rotor, trigger pulse voltage is sent to the G poles of the second thyristor and the third thyristor, so that the second thyristor and the third thyristor are conducted, the generator rotor, the energy dissipation device, the second thyristor and the third thyristor form a reverse loop, the resistance value of the energy dissipation device is suddenly reduced due to the overvoltage voltage and is equivalent to a short circuit state, and the overvoltage energy is discharged, so that the overvoltage effect is eliminated; therefore, the second and the third thyristors are used for replacing the diode in the original reverse loop in the reverse loop, when the trigger module detects that reverse overvoltage occurs on the generator rotor, the second and the third thyristors are triggered to be conducted, so that the reverse loop is formed.
Drawings
Fig. 1 is a circuit diagram of a de-excitation loop of a generator set excitation system according to an embodiment of the present utility model.
Fig. 2 is a trigger principle wiring diagram of a trigger module of an embodiment of the present utility model.
Detailed Description
The present utility model is described below with reference to the accompanying drawings, and the specific embodiments described herein are for illustrating and explaining the present utility model, not for limiting the present utility model, and various modifications and improvements made by those skilled in the art to which the present utility model pertains without departing from the spirit of the design of the present utility model, should fall within the scope of the present utility model.
As shown in fig. 1 and fig. 2, the field-eliminating circuit of the generator set field-eliminating system of the present embodiment includes a primary field source, a field-eliminating switch, an energy-eliminating device, a triggering module, a generator rotor, a first thyristor, a second thyristor and a third thyristor.
The positive pole of the primary excitation power supply is respectively and electrically connected with one end of the energy dissipation device and the positive pole of the generator rotor, the energy dissipation device and the generator rotor are connected in parallel in a circuit, a plurality of magnetic extinction switches are arranged between the junction of the connecting end of the energy dissipation device and the positive pole of the generator rotor and the positive pole of the primary excitation power supply, the plurality of magnetic extinction switches are connected in series in the circuit, one end of the magnetic extinction switch connected in series is electrically connected with the positive pole of the primary excitation power supply, the other end of the magnetic extinction switch is respectively and electrically connected with one end of the energy dissipation device and the positive pole of the generator rotor, and in the circuit of fig. 1, the magnetic extinction switch is represented by QFG.
The other end of the energy dissipation device is electrically connected with the positive electrode of the detection end of the trigger module, the positive electrode of the first thyristor, the negative electrode of the second thyristor and the negative electrode of the third thyristor respectively. The trigger end of the trigger module is electrically connected with the G poles of the first thyristor, the second thyristor and the third thyristor respectively. The negative electrode of the detection end of the trigger module, the negative electrode of the first thyristor, the positive electrode of the second thyristor and the positive electrode of the third thyristor are electrically connected with the negative electrode of the primary excitation power supply. The negative pole of the generator rotor is electrically connected with the negative pole of the primary excitation power supply.
The two ends of the energy dissipation device are connected with a resistor R71 in parallel, the resistance value of the resistor R71 is 10KΩ, the energy dissipation device is connected with a shunt in series, the energy dissipation device and the shunt are connected with the resistor R71 in parallel, and the shunt is used for measuring the de-excitation current. In this embodiment, the energy dissipation device is a zinc oxide or silicon carbide de-excitation resistor, and the energy dissipation device is represented by GB in the circuit.
The first thyristor, the second thyristor and the third thyristor are connected in parallel, the three thyristors after being connected in parallel are shown as a whole as V71 in fig. 1, and the first thyristor, the second thyristor and the third thyristor are shown as V1, V2 and V3 in fig. 2, respectively.
The detection end of the trigger module is used for detecting whether the loop of the generator rotor is forward voltage or reverse voltage. Specifically, the triggering module includes a first relay K1, a second relay K2, and a third relay K3. The coil anodes of the first relay K1, the second relay K2 and the third relay K3 are respectively and electrically connected with the anode of the primary excitation power supply, the coil cathodes of the first relay K1, the second relay K2 and the third relay K3 are respectively and electrically connected with the cathode of the primary excitation power supply, the common end of the first relay K1, the common end of the second relay K2 and the common end of the third relay K3 are respectively and electrically connected with the cathode of the primary excitation power supply, and the normally open ends of the first relay K1, the second relay K2 and the third relay K3 are respectively and electrically connected with the G poles of the third thyristor, the second thyristor and the first thyristor; and a switching-off position contact of the magnetic-killing switch is arranged between the coil positive electrode of the first relay and the coil positive electrode of the second relay and the positive electrode of the primary excitation power supply, and in the circuit, the switching-off position contact of the magnetic-killing switch is represented by QFG1 and QFG 2. In the circuit, resistors R1, R2 and R3 are connected in series between a coil positive electrode of the first relay K1 and a switching-off position contact QFG1 of the magnetic-deactivation switch, resistors R4, R5 and R6 are connected in series between a coil positive electrode of the second relay K2 and a switching-off position outlet QFG2 of the magnetic-deactivation switch, and a resistor R0 is connected in series between a coil positive electrode of the third relay K3 and a positive electrode of the primary excitation power supply. Furthermore, a rectifier bridge circuit is connected to the circuit of the triggering module. In the circuit, the trigger module is denoted by the symbol AP 62.
The current transformer is connected between the junction point of the cathode of the first thyristor, the anode of the second thyristor, the anode of the third thyristor and the cathode of the detection end of the trigger module and the cathode of the primary excitation power supply, and is connected with the generator rotor in parallel, and is denoted by BA61 in a circuit and used for measuring the de-excitation current. And a magnetic extinction switch is arranged between the connecting end of the current transformer and the negative electrode intersection point of the generator rotor and the negative electrode of the primary excitation power supply, namely one end of the magnetic extinction switch is electrically connected with the negative electrode of the primary excitation power supply, and the other end of the magnetic extinction switch is respectively electrically connected with one end of the current transformer and the negative electrode of the generator rotor.
The working principle of the triggering module is as follows: when the generator normally operates, the magnetic extinction switch is closed, the third relay K3 is conducted, the first relay K1 and the second relay K2 are not conducted, at the moment, the trigger module (AP 62) detects that the rotor loop is in positive (LZ 611 is positive, LZ612 is negative) overvoltage, trigger pulse voltage is sent to the G pole of the first thyristor (V1) to enable the first thyristor to be conducted, and then the voltage positive pole (LZ 611) forms a loop with the voltage negative pole (LZ 612) through the energy dissipation device, the first thyristor and the current transformer (BA 61) for measuring the current through the magnetic extinction current, and the resistance value of the energy dissipation device is also suddenly reduced due to voltage overvoltage and is equivalent to a short circuit state, so that overvoltage energy is achieved to eliminate overvoltage.
When the generator fails, the magnetic extinction switch is opened, the contacts (QFG 1 and QFG 2) at the opening position are connected after the switch is opened, at the moment, the trigger module detects reverse overvoltage of the rotor loop of the generator, the coils of the first relay K1 and the second relay K2 are electrified, the third relay K3 is opened, the normally open ends of the first relay K1 and the second relay K2 are closed, so that the second thyristor and the third thyristor send trigger pulse voltage, the second thyristor and the third thyristor are conducted, the generator rotor is reversely (LZ 612 is positive electrode and LZ611 is negative electrode) voltage, and the reverse voltage is applied between the energy dissipation device and the resistor R71 through the current transformer, the second thyristor (V2) and the third thyristor (V3), and the energy dissipation device has good nonlinear volt-ampere characteristics, namely the resistance value is very large when the voltage at two ends of the energy dissipation device is lower than the threshold value (voltage sensitive voltage), the current flowing through the energy dissipation device is very small, the resistance value is suddenly reduced when the voltage is higher than the threshold value, the voltage is equivalent to a short circuit state, therefore, the over-voltage is released, and the high voltage state is restored after the over-voltage is high. The resistance value of the resistor R71 connected in parallel with the energy dissipation device reaches 10kΩ, and the current flowing through the resistor R71 is very small no matter in normal or overvoltage, so that the effect of the energy dissipation device is not affected.
In summary, the second and the third thyristors are used to replace the diode in the original reverse loop in the reverse loop, when the trigger module detects that the reverse overvoltage occurs on the generator rotor, the second and the third thyristors are triggered to be conducted, so that the reverse loop is formed.
Claims (7)
1. A field-eliminating loop of a generator set excitation system comprises a primary excitation power supply, a field-eliminating switch, an energy-dissipating device, a trigger module and a generator rotor; the method is characterized in that: the semiconductor device further comprises a first thyristor, a second thyristor and a third thyristor; the positive pole of the primary excitation power supply is respectively and electrically connected with one end of the energy dissipation device and the positive pole of the generator rotor, and a plurality of magnetic extinction switches are arranged between the junction of the connecting end of the energy dissipation device and the positive pole of the generator rotor and the positive pole of the primary excitation power supply; the other end of the energy dissipation device is electrically connected with the positive electrode of the detection end of the trigger module, the positive electrode of the first thyristor, the negative electrode of the second thyristor and the negative electrode of the third thyristor respectively; the triggering end of the triggering module is electrically connected with the G poles of the first thyristor, the second thyristor and the third thyristor respectively; the negative electrode of the detection end of the trigger module, the negative electrode of the first thyristor, the positive electrode of the second thyristor and the positive electrode of the third thyristor are electrically connected with the negative electrode of the primary excitation power supply; the negative pole of the generator rotor is electrically connected with the negative pole of the primary excitation power supply.
2. The genset excitation system de-excitation loop of claim 1 wherein: the triggering module comprises a first relay K1, a second relay K2 and a third relay K3; the coil anodes of the first relay K1, the second relay K2 and the third relay K3 are respectively and electrically connected with the anode of the primary excitation power supply, the coil cathodes of the first relay K1, the second relay K2 and the third relay K3 are respectively and electrically connected with the cathode of the primary excitation power supply, the common end of the first relay K1, the common end of the second relay K2 and the common end of the third relay K3 are respectively and electrically connected with the cathode of the primary excitation power supply, and the normally open ends of the first relay K1, the second relay K2 and the third relay K3 are respectively and electrically connected with the G poles of the third thyristor, the second thyristor and the first thyristor; and a magnetic extinction switch opening position contact is arranged between the coil positive poles of the first relay and the second relay and the positive pole of the primary excitation power supply.
3. The genset excitation system de-excitation loop of claim 1 wherein: the two ends of the energy dissipation device are connected with a resistor R71 in parallel.
4. A genset excitation system de-excitation loop according to claim 3, wherein: the energy dissipation device is connected with a shunt in series, and the energy dissipation device and the shunt are connected with a resistor R71 in parallel.
5. The genset excitation system de-excitation loop of claim 4 wherein: the energy dissipation device is a zinc oxide de-excitation resistor or a silicon carbide de-excitation resistor.
6. The genset excitation system de-excitation loop of claim 1 wherein: and a current transformer is connected between the junction point of the cathode of the first thyristor, the anode of the second thyristor, the anode of the third thyristor and the cathode of the detection end of the trigger module and the cathode of the primary excitation power supply, and the current transformer is connected with the generator rotor in parallel.
7. The genset excitation system de-excitation loop of claim 6 wherein: and a magnetic extinction switch is arranged between the connecting end of the current transformer and the negative electrode junction point of the generator rotor and the negative electrode of the primary excitation power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322342846.0U CN220754679U (en) | 2023-08-30 | 2023-08-30 | Excitation system de-excitation loop of generator set |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322342846.0U CN220754679U (en) | 2023-08-30 | 2023-08-30 | Excitation system de-excitation loop of generator set |
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| Publication Number | Publication Date |
|---|---|
| CN220754679U true CN220754679U (en) | 2024-04-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322342846.0U Active CN220754679U (en) | 2023-08-30 | 2023-08-30 | Excitation system de-excitation loop of generator set |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220754679U (en) |
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2023
- 2023-08-30 CN CN202322342846.0U patent/CN220754679U/en active Active
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