CN215897287U - De-excitation resistor rapid switching loop based on de-excitation switch tripping - Google Patents
De-excitation resistor rapid switching loop based on de-excitation switch tripping Download PDFInfo
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- CN215897287U CN215897287U CN202121202741.XU CN202121202741U CN215897287U CN 215897287 U CN215897287 U CN 215897287U CN 202121202741 U CN202121202741 U CN 202121202741U CN 215897287 U CN215897287 U CN 215897287U
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- 230000001629 suppression Effects 0.000 claims abstract description 60
- 230000005284 excitation Effects 0.000 claims abstract description 37
- 238000012544 monitoring process Methods 0.000 claims abstract description 19
- 238000010791 quenching Methods 0.000 claims abstract description 18
- 230000000171 quenching effect Effects 0.000 claims abstract description 18
- 230000005347 demagnetization Effects 0.000 claims description 18
- 230000003068 static effect Effects 0.000 abstract description 5
- 238000010891 electric arc Methods 0.000 abstract 1
- 230000001960 triggered effect Effects 0.000 abstract 1
- 238000000926 separation method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000002035 prolonged 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
- 238000010586 diagram Methods 0.000 description 1
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Abstract
The utility model discloses a de-excitation resistor rapid switching loop based on de-excitation switch tripping, which solves the problems that the de-excitation resistor cannot be switched or the waiting time before switching is too long when a de-excitation switch is tripped due to overcurrent of a body or a tripping connecting rod is manually operated in the traditional loop, reduces the damage degree of the arc discharge of the de-excitation switch to moving and static contacts, and reduces the damage of accident current to a generator. In the loop of the utility model, an excitation system rapid controller collects parallel signals of 2 normally-open auxiliary contacts of the magnetic quenching switches and a generator outlet voltage monitoring relay contact signal, and after the magnetic quenching switches of a generator are tripped in a grid-connected or no-load state, a closing order of the tripping signal contact of the magnetic quenching switches is opened. The thyristor trigger unit collects tripping signal contact signals of the magnetic quenching switch and opening control signal contact signals of the magnetic quenching switch and outputs trigger signals of the thyristor. And then, after the thyristor is triggered and conducted, the field suppression resistor and the thyristor are connected in series and are bridged at two ends of the generator rotor, so that accident field suppression is realized.
Description
Technical Field
The utility model belongs to the technical field of excitation control of a power system, and particularly relates to a de-excitation resistor rapid switching loop based on tripping of a de-excitation switch.
Background
The excitation system is an indispensable control device of the synchronous generator, and the reliability of the excitation system is directly related to the safe and stable operation of the power grid. As an important component of an excitation system, the field suppression system can integrate field suppression resistors into two sides of a generator rotor when a protection device trips a field suppression switch when an internal and external short circuit fault occurs in a generator, so that energy stored in the excitation transformer and between a generator stator and a generator rotor is quickly consumed, rotor current, generator electromotive force and an accident short circuit current value are quickly attenuated, the damage of a short circuit current thermal effect and an electromagnetic effect on a generator bar, an iron core and the like is reduced, and the accident is prevented from being expanded.
There are many de-excitation resistance input circuits (for example, the de-excitation circuit disclosed in chinese patent document CN 205754093U), and the simplest and most common circuit is that a thyristor trigger unit is linked by a tripping command of a generator protection device or an excitation control system, and the thyristor is turned on to release magnetic energy of a rotor on the de-excitation resistance through the thyristor in a bridging manner. However, when the de-excitation switch body is tripped due to overcurrent or a trip connecting rod is manually operated, the de-excitation resistor cannot be put into the de-excitation switch body to perform accident de-excitation.
There is also the return circuit that uses the normally closed auxiliary contact of demagnetization switch linkage thyristor trigger unit to drop demagnetization resistance, but the demagnetization switch is from tripping, through sound contact complete separation, and then to the closed auxiliary contact closure of normally closed, and the required time is longer, and this performance guarantee value of common demagnetization switch generally is 75 ~ 100ms, can't drop demagnetization resistance at the very first time and carry out effectual accident demagnetization.
When the magnetic quenching switch is tripped, the magnetic quenching resistor cannot be put into use or cannot be put into use quickly, so that the magnetic quenching switch can be burnt due to hard arc, short-circuit accidents of the generator can be expanded, and the situation cannot be allowed. The technical scheme solves the problem that when the de-excitation switch body is tripped due to overcurrent or a trip connecting rod is manually operated to trip, the de-excitation resistor is effectively and quickly put into the de-excitation switch body.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a de-excitation resistor rapid switching loop based on de-excitation switch tripping, which is used for solving the technical problems in the prior art.
In order to achieve the purpose, the technical scheme of the utility model is as follows:
a field suppression resistor rapid switching loop based on tripping of a field suppression switch comprises a generator rotor anode, a field suppression resistor, a thyristor, a generator rotor cathode, a thyristor trigger unit and a field suppression switch opening control signal contact;
the anode of the thyristor is connected with the negative pole of the generator rotor, the cathode of the thyristor is connected with one end of the field suppression resistor, and the other end of the field suppression resistor is connected with the positive pole of the generator rotor, namely, a jumper formed by connecting the thyristor and the field suppression resistor in series is merged into a loop of the generator rotor;
the positive electrode of the output unit of the thyristor trigger unit is connected with the gate pole of the thyristor, and the negative electrode of the output unit of the thyristor trigger unit is connected with the cathode of the thyristor;
one end of a switch-off control signal contact of the field suppression switch is connected with the anode of the acquisition unit of the thyristor trigger unit, and the other end of the switch-off control signal contact is connected with the cathode of the acquisition unit of the thyristor trigger unit.
Furthermore, a fast controller of an excitation system, a normally open auxiliary contact I of a de-excitation switch, a normally open auxiliary contact II of the de-excitation switch, a generator outlet voltage monitoring relay contact and a signal opening contact of the fast controller of the excitation system are introduced;
one end of a normally open auxiliary contact II of the magnetic quenching switch is divided into two paths, wherein one path is connected with a signal terminal DI1 of a switching value input 1 of the excitation system quick controller, and the other path is connected with one end of the normally open auxiliary contact I of the magnetic quenching switch;
the other end of the normally open auxiliary contact II of the field suppression switch is divided into three paths, the first path is connected with the other end of the normally open auxiliary contact I of the field suppression switch, the second path is connected with one end of a generator outlet voltage monitoring relay contact, and the third path is connected with a switching value input power supply common terminal COM of the excitation system quick controller;
the other end of the generator outlet voltage monitoring relay contact is connected with a signal terminal DI2 of a switching value input 2 of the excitation system quick controller;
one end of a signal opening contact of the quick controller of the excitation system is connected with one end of a switch-off control signal contact of the de-excitation switch, and the other end of the signal opening contact of the quick controller of the excitation system is connected with the other end of the switch-off control signal contact of the de-excitation switch.
Further, the excitation system rapid controller collects a parallel signal of a normally open auxiliary contact I of the de-excitation switch and a normally open auxiliary contact II of the de-excitation switch and a contact signal of a generator outlet voltage monitoring relay, and judges that after the normally open auxiliary contact I of the de-excitation switch and the normally open auxiliary contact II of the de-excitation switch are both disconnected in a grid-connected or no-load state of the generator, namely after the de-excitation switch is tripped in the grid-connected or no-load state of the generator, a tripping signal of the de-excitation switch is generated;
the tripping signal of the de-excitation switch switches on the thyristor through the thyristor trigger unit, and the de-excitation resistor and the thyristor are connected in series and bridged at two ends of the generator rotor.
Compared with the prior art, the utility model has the beneficial effects that:
the scheme has the innovation point that the auxiliary contact is introduced as an action condition, and the deexcitation resistor can be effectively put into the deexcitation switch to perform accident deexcitation when the deexcitation switch is tripped due to overcurrent of the main body or a trip connecting rod is manually operated to trip the main body, so that the damage of the actual situation to the deexcitation switch and a generator is avoided; the normally open auxiliary contact of the field suppression switch can be disconnected at the instant of tripping action without waiting for the complete separation of the moving contact and the static contact, and the acquisition and control period of a common excitation rapid controller is in the level of 1-2 ms, so that the field suppression resistor can be rapidly switched into without completely separating the moving contact and the static contact, and the damage degree of the field suppression switch and a generator is reduced; because the voltage monitoring relay contact at the outlet of the generator is introduced for locking, the field suppression resistor cannot be put into use when the generator is stopped or in an idle state, the problem that a thyristor jumper is frequently put into use when a field suppression switch is in a switching-on and switching-off test is avoided, the service lives of the thyristor and a trigger unit thereof are prolonged, and the problem that monitoring signals are frequently reported to further interfere a monitoring disc of an operator on duty is avoided; because the parallel signals of the normally open auxiliary contacts of the two demagnetization switches are adopted, the risk of mistakenly putting in the demagnetization resistor caused by single signal misoperation is avoided.
Drawings
FIG. 1 is a circuit diagram of a fast-switching loop of the field suppression resistor of the present invention.
Fig. 2 is a flow chart of the operation of the rapid switching circuit of the field suppression resistor of the present invention.
Fig. 3 is a flow chart of the internal operation of the excitation fast controller of the present invention.
In the figure: the generator rotor comprises a generator rotor anode 1, a field suppression resistor 2, a thyristor 3, a generator rotor cathode 4, a thyristor trigger unit 5, a field suppression switch opening control signal contact 6, a field suppression switch tripping signal contact 7 in a grid-connected or no-load state, an excitation system controller 8, a field suppression switch normally-open auxiliary contact I9, a field suppression switch normally-open auxiliary contact II 10 and a generator outlet voltage monitoring relay contact 11. Wherein BOD denotes a thyristor trigger unit and FER denotes an excitation system fast controller.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to fig. 1-2 of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example (b):
as shown in fig. 1-3, a field suppression switch tripping-based field suppression resistor rapid switching loop comprises a generator rotor anode 1, a field suppression resistor 2, a thyristor 3, a generator rotor cathode 4, a thyristor trigger unit 5, a field suppression switch opening control signal contact 6, a field suppression switch tripping signal contact 7 in a grid-connected or no-load state, an excitation system rapid controller 8, a field suppression switch normally-open auxiliary contact one 9, a field suppression switch normally-open auxiliary contact two 10, a generator outlet voltage monitoring relay contact 11 and the like.
The positive pole of thyristor 3 is connected generator rotor negative pole 4, and the one end of demagnetization resistance 2 is connected to the thyristor 3 negative pole, and the other end of demagnetization resistance 2 is connected generator rotor positive pole 1, and the jumper that like this thyristor 3 and demagnetization resistance 2 establish ties has merged into the generator rotor return circuit.
The positive pole of the output unit of the thyristor trigger unit 5 is connected with the gate pole of the thyristor 3, and the negative pole of the output unit of the thyristor trigger unit 5 is connected with the cathode of the thyristor 3. One end of a switch-off control signal contact 6 of the field suppression switch is divided into two paths, wherein one path is connected with the anode of the acquisition unit of the thyristor trigger unit 5, and the other path is connected with one end of a switching value output contact 6 of the fast controller of the excitation system. The other end of the switch-off control signal contact 6 of the field-suppression switch is divided into two paths, wherein one path is connected with the cathode of the acquisition unit of the thyristor trigger unit 5, and the other path is connected with the other end of the switching value output contact 7 of the fast controller of the excitation system.
One end of the normally open auxiliary contact II 10 of the magnetic quenching switch is divided into two paths, wherein one path is connected with a signal terminal DI1 of the switching value input 1 of the excitation system quick controller 8, and the other path is connected with one end of the normally open auxiliary contact I9 of the magnetic quenching switch. The other end of the normally open auxiliary contact II 10 of the field suppression switch is divided into three paths, the first path is connected with the other end of the normally open auxiliary contact I9 of the field suppression switch, the second path is connected with one end of a generator outlet voltage monitoring relay contact 11, and the third path is connected with a switching value input power supply common terminal COM of the excitation system quick controller 8. The other end of generator outlet voltage monitor relay contact 11 is connected to signal terminal DI2 of switching value input 2 of excitation system fast controller 8.
The working principle of the whole device is as follows:
when the generator outlet has pressure, the generator outlet voltage monitoring relay contact 11 is closed, and when the excitation system quick controller 8 detects that the DI2 signal arrives, the generator is judged to be in an idle load or grid-connected state. At this time, if the magnetic quenching switch is tripped due to overcurrent or a trip connecting rod is manually operated, the first magnetic quenching switch normally-open auxiliary contact 9 and the second magnetic quenching switch normally-open auxiliary contact 10 are simultaneously opened, and when the excitation system quick controller 8 detects DI1 reset, the magnetic quenching switch is judged to be tripped in a no-load or grid-connected state, and a closing order of the output contact 7 is opened. Furthermore, the acquisition unit loop of the thyristor trigger unit 5 is closed.
When the generator protection device or the excitation control system opens the switch-off command of the field suppression switch, the switch-off control signal contact 6 of the field suppression switch is closed, which also causes the loop of the acquisition unit of the thyristor trigger unit 5 to be closed.
After the acquisition unit loop of the thyristor trigger unit 5 is closed, the output unit of the thyristor trigger unit 5 acts to conduct the thyristor 3, so that the field suppression resistor is bridged on the positive electrode and the negative electrode of the generator rotor through the thyristor 3, and the rapid input of the field suppression resistor is realized.
In the scheme, the auxiliary contact is introduced as an action condition, and when the de-excitation switch is tripped due to overcurrent of the main body or a trip connecting rod is manually operated to trip, the de-excitation resistor can be effectively put into the de-excitation switch to perform accident de-excitation, so that the damage of the de-excitation switch and a generator under the actual condition is avoided; the normally open auxiliary contact of the field suppression switch can be disconnected at the instant of tripping action without waiting for the complete separation of the moving contact and the static contact, and the acquisition and control period of a common excitation rapid controller is in the level of 1-2 ms, so that the field suppression resistor can be rapidly switched into without completely separating the moving contact and the static contact, and the damage degree of the field suppression switch and a generator is reduced; because the voltage monitoring relay contact at the outlet of the generator is introduced for locking, the field suppression resistor cannot be put into use when the generator is stopped or in an idle state, the problem that a thyristor jumper is frequently put into use when a field suppression switch is in a switching-on and switching-off test is avoided, the service lives of the thyristor and a trigger unit thereof are prolonged, and the problem that monitoring signals are frequently reported to further interfere a monitoring disc of an operator on duty is avoided; because the parallel signals of the normally open auxiliary contacts of the two demagnetization switches are adopted, the risk of mistakenly putting in the demagnetization resistor caused by single signal misoperation is avoided.
The above are preferred embodiments of the present invention, and all changes made according to the technical scheme of the present invention that produce functional effects do not exceed the scope of the technical scheme of the present invention belong to the protection scope of the present invention.
Claims (3)
1. A field suppression resistor rapid switching loop based on tripping of a field suppression switch is characterized by comprising a generator rotor positive pole (1), a field suppression resistor (2), a thyristor (3), a generator rotor negative pole (4), a thyristor trigger unit (5) and a field suppression switch opening control signal contact (6);
the anode of the thyristor (3) is connected with the negative pole (4) of the generator rotor, the cathode of the thyristor (3) is connected with one end of the field suppression resistor (2), the other end of the field suppression resistor (2) is connected with the positive pole (1) of the generator rotor, namely, a jumper which is formed by connecting the thyristor (3) and the field suppression resistor (2) in series is merged into a loop of the generator rotor;
the positive electrode of the output unit of the thyristor trigger unit (5) is connected with the gate electrode of the thyristor (3), and the negative electrode of the output unit of the thyristor trigger unit (5) is connected with the cathode of the thyristor (3);
one end of a switch-off control signal contact (6) of the magnetic switch is connected with the anode of the acquisition unit of the thyristor trigger unit (5), and the other end of the switch-off control signal contact is connected with the cathode of the acquisition unit of the thyristor trigger unit (5).
2. The rapid input circuit of a field suppression resistor based on trip of a field suppression switch according to claim 1, characterized in that a rapid controller (8) of an excitation system, a first normally open auxiliary contact (9) of the field suppression switch, a second normally open auxiliary contact (10) of the field suppression switch, a generator outlet voltage monitoring relay contact (11) and a signal output contact (7) of the rapid controller (8) of the excitation system are introduced;
one end of a normally open auxiliary contact II (10) of the magnetic quenching switch is divided into two paths, wherein one path is connected with a signal terminal DI1 of a switching value input 1 of the excitation system quick controller (8), and the other path is connected with one end of a normally open auxiliary contact I (9) of the magnetic quenching switch;
the other end of the normally open auxiliary contact II (10) of the field suppression switch is divided into three paths, the first path is connected with the other end of the normally open auxiliary contact I (9) of the field suppression switch, the second path is connected with one end of a generator outlet voltage monitoring relay contact (11), and the third path is connected with a switching value input power supply common terminal COM of the excitation system quick controller (8);
the other end of the generator outlet voltage monitoring relay contact (11) is connected with a signal terminal DI2 of a switching value input 2 of an excitation system quick controller (8);
one end of a signal opening contact (7) of the excitation system quick controller (8) is connected with one end of a switch-off control signal contact (6), and the other end of the signal opening contact (7) of the excitation system quick controller (8) is connected with the other end of the switch-off control signal contact (6).
3. The rapid input circuit of the demagnetization resistor based on the trip of the demagnetization switch according to claim 2, characterized in that the excitation system rapid controller (8) collects the parallel signal of the normally open auxiliary contact one (9) and the normally open auxiliary contact two (10) of the demagnetization switch and the signal of the generator outlet voltage monitoring relay contact (11), and determines that the normally open auxiliary contact one (9) and the normally open auxiliary contact two (10) of the demagnetization switch are both disconnected when the generator is in a grid-connected or no-load state, that is, the generator is tripped when the demagnetization switch is in the grid-connected or no-load state, and then opens the signal opening contact (7);
the signal opening contact (7) conducts the thyristor (3) through the thyristor trigger unit (5), and then the field suppression resistor (2) and the thyristor (3) are connected in series and bridged at two ends of the generator rotor.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121202741.XU CN215897287U (en) | 2021-05-31 | 2021-05-31 | De-excitation resistor rapid switching loop based on de-excitation switch tripping |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121202741.XU CN215897287U (en) | 2021-05-31 | 2021-05-31 | De-excitation resistor rapid switching loop based on de-excitation switch tripping |
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| Publication Number | Publication Date |
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| CN215897287U true CN215897287U (en) | 2022-02-22 |
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| CN202121202741.XU Active CN215897287U (en) | 2021-05-31 | 2021-05-31 | De-excitation resistor rapid switching loop based on de-excitation switch tripping |
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| CN (1) | CN215897287U (en) |
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- 2021-05-31 CN CN202121202741.XU patent/CN215897287U/en active Active
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