CN105119544A - Magnetic blow-out switch protective device - Google Patents
Magnetic blow-out switch protective device Download PDFInfo
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- CN105119544A CN105119544A CN201510605084.6A CN201510605084A CN105119544A CN 105119544 A CN105119544 A CN 105119544A CN 201510605084 A CN201510605084 A CN 201510605084A CN 105119544 A CN105119544 A CN 105119544A
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- thyristor
- branch road
- field suppression
- suppression switch
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Abstract
The invention discloses a magnetic blow-out switch protective device, and relates to the excitation control field of synchronous motors. The technical main points are that the magnetic blow-out switch protective device comprises a commutation branch and a magnetic blow-out branch, a three-phase AC power output end of an excitation transformer is connected to a three-phase AC power input end of a thyristor rectifier bridge, a first DC output end of the thyristor rectifier bridge is connected to one end of a magnetic blow-out switch, the other end of the magnetic blow-out switch is connected to one end of a load, the other end of the load is connected to a second DC output end of the thyristor rectifier bridge, one end of the commutation branch is connected to the other end of the magnetic blow-out switch, the other end of the commutation branch is connected to the second DC output end of the thyristor rectifier bridge, one end of the magnetic blow-out branch is connected to the other end of the magnetic blow-out switch, and the other end of the magnetic blow-out branch is connected to the second DC output end of the thyristor rectifier bridge, the commutation branch is used for conduction before the magnetic blow-out switch is turned off and then is cut off after keeping conducting for a period of time, and the magnetic blow-out branch is used for conduction after the commutation branch is cut off.
Description
Technical field
The present invention relates to synchronous machinery excitation control field, especially a kind of field suppression switch protective device.
Background technology
In synchronous generator excited system, excitation system Main Function is that alternating current is transformed into controlled direct current, the method of conversion generally adopts thyristor rectifier bridge, rectifier bridge be input as three-phase alternating-current supply voltage, export as pulsating dc voltage, be linked in load by field suppression switch, i.e. Generator's Rotor Circuit.
The Main Function of field suppression switch makes generator amature connect rectification DC power supply.But main effect, exactly when accident appears in engine block or electrical network or other device, can cut off the field power supply of rotor windings efficiently and effectively.
The field suppression switch that the excitation system of high-rating generator adopts can by the direct current of a few kiloampere, and when generator accident or outside accident, protection system can send trip command, and order field suppression switch trips.Due to field suppression switch connection is inductive load, and inductive current cannot suddenly change, otherwise can respond to higher voltage.For this reason, usual way is for inductive current provides demagnetization circuit, makes demagnetization current conversion in magnetism elimination circuit, and common demagnetization circuit is made up of linear resistance or nonlinear resistance and commutation switch.See such as 1.
When field suppression switch disconnects, the effect of inductance makes the voltage reversal of load, switch in magnetism elimination circuit is due to the effect of inverse overvoltage or the effect conducting due to the normally closed point of field suppression switch, magnetism elimination circuit is connected, field suppression switch electric current reduces gradually, the electric current of magnetism elimination circuit increases, and final field suppression switch disconnects.But in this course, field suppression switch is due to the effect of inductance reverse voltage, bear higher voltage and current, therefore trip at every turn, can make field suppression switch contact arcing scaling loss, repeatedly after tripping operation, the contact of field suppression switch just needs to change, and general 2-3 just needs replacing field suppression switch main contact, add operating cost, reduce the reliability of field suppression switch.
Summary of the invention
Technical problem to be solved by this invention is: for above-mentioned Problems existing, provides a kind of field suppression switch protective device.
Existing excitation system includes excitation transformer, thyristor rectifier bridge, field suppression switch and load; The three-phase alternating current output of excitation transformer is connected with the three-phase alternating current electrical input of thyristor rectifier bridge, first DC output end of thyristor rectifier bridge is connected with one end of field suppression switch, the other end of field suppression switch is connected with one end of load, and the other end of load is connected with the second DC output end of thyristor rectifier bridge.
Technical scheme of the present invention adds change of current branch road and demagnetization branch road on the basis of foregoing circuit structure.
One end of described change of current branch road is connected with the described other end of field suppression switch, and the other end of change of current branch road is connected with the second DC output end of thyristor rectifier bridge; One end of demagnetization branch road is connected with the described other end of field suppression switch, and the other end of demagnetization branch road is connected with the second DC output end of thyristor rectifier bridge.
Described change of current branch road is used for conducting before field suppression switch disconnects and turns off after maintaining conducting certain hour; Described demagnetization branch road is used for closing at the change of current branch road conducting of having no progeny.
Further, also comprise the conducting of change of current branch road to switch off control circuit and demagnetization branch road turn-on control circuit;
The conducting of change of current branch road switches off control circuit for controlling the conducting turning off after maintaining conducting certain hour before field suppression switch disconnects of change of current branch road;
Demagnetization branch road turn-on control circuit closes at the change of current branch road conducting of having no progeny for controlling demagnetization branch road.
Further, described change of current branch road comprises the first thyristor; The conducting of described change of current branch road switches off control circuit and comprises controller, the second thyristor, the first diode, the first resistance and electric capacity;
The negative electrode of described first thyristor is connected with the described other end of field suppression switch, and the anode of the first thyristor is connected with the second DC terminal of thyristor rectifier bridge;
The anode of the first diode is connected with the described other end of field suppression switch, the negative electrode of the first diode is connected with one end of the first resistance, the other end of the first resistance is connected with one end of electric capacity, and the other end of electric capacity is connected with the second DC output end of thyristor rectifier bridge;
Described second thyristor and the first diodes in parallel, and the negative electrode of the second thyristor is connected with the described other end of field suppression switch;
The control end of the first thyristor is all connected with controller with the control end of the second thyristor.
Further, described demagnetization branch road comprises the second resistance and the 3rd thyristor; Described demagnetization branch road turn-on control circuit comprises the 3rd resistance, the 4th resistance, the second diode and trigger;
With change of current branch circuit parallel connection after second resistance and the 3rd Thyristors in series, the anode of the 3rd thyristor is connected with the second DC output end of thyristor rectifier bridge;
After 3rd resistance, the 4th resistance and the second Diode series again with change of current branch circuit parallel connection, and the anode of the second diode is connected with the second DC output end of thyristor rectifier bridge;
The triggering signal input of trigger is connected between the 3rd resistance and the 4th resistance, and the triggering signal output of trigger is connected with the control end of the 3rd thyristor.
Further, described field suppression switch is the mechanical contact of circuit breaker; Described controller is used for exporting trigger impulse simultaneously to the automatically controlled end of described circuit breaker and the first thyristor control end and extending certain hour, backward 3rd thyristor control end export conducting trigger impulse.
In sum, owing to have employed technique scheme, the invention has the beneficial effects as follows:
Field suppression switch protective circuit of the present invention is automatic conducting change of current branch road before field suppression switch disconnects; the electric current in field suppression switch is made to be quickly transferred in change of current branch road; field suppression switch is disconnected under the condition of very little electric current, protects field suppression switch, the contact of field suppression switch is not fragile.After field suppression switch tripping, change of current branch road disconnects demagnetization branch road conducting simultaneously, and the resistance on demagnetization branch road makes motor-field electric current reduce rapidly.Therefore, the invention enables field suppression switch can be effectively protected when tripping, ensure that the quick de-excitation of magnetism elimination circuit simultaneously.
Accompanying drawing explanation
Examples of the present invention will be described by way of reference to the accompanying drawings, wherein:
Fig. 1 is existing field suppression equipment.
Fig. 2 is field suppression switch protective device first embodiment in the present invention.
Fig. 3 is field suppression switch protective device second embodiment in the present invention.
Mark in figure:
1 is transformer; 2 is thyristor rectifier bridge; 3 is field suppression switch; 4 is load; 5 is change of current branch road; 6 is demagnetization branch road; 7 is controller.
Embodiment
All features disclosed in this specification, or the step in disclosed all methods or process, except mutually exclusive feature and/or step, all can combine by any way.
Arbitrary feature disclosed in this specification, unless specifically stated otherwise, all can be replaced by other equivalences or the alternative features with similar object.That is, unless specifically stated otherwise, each feature is an example in a series of equivalence or similar characteristics.
First embodiment
See Fig. 2, existing excitation system includes excitation transformation, 1, thyristor rectifier bridge 2, field suppression switch 3 and load 4.The three-phase alternating current output of excitation transformer 1 is connected with the three-phase alternating current electrical input of thyristor rectifier bridge 2, first DC output end of thyristor rectifier bridge 2 is connected with one end of field suppression switch 3, the other end of field suppression switch 3 is connected with one end of load 4, and the other end of load 4 is connected with the second DC output end of thyristor rectifier bridge 2.
Further comprise change of current branch road 5 and demagnetization branch road 6.
One end of described change of current branch road 5 is connected with the described other end of field suppression switch 3, and the other end of change of current branch road 5 is connected with the second DC output end of thyristor rectifier bridge 2; Demagnetization branch road 6 is in parallel with change of current branch road 5.
Described change of current branch road 5 disconnects front 5ms ~ 10ms conducting for starting at field suppression switch and maintains conducting certain hour, as 100ms(field suppression switch, complete tripping operation in 50ms ~ 100ms) turn off afterwards; Described demagnetization branch road is used for closing at the change of current branch road conducting of having no progeny.
When before field suppression switch tripping operation, the thyristor of change of current branch road 5 obtains conducting triggering signal in advance, prepares the conducting when thyristor obtains forward voltage; When field suppression switch starts to trip; the thyristor of change of current branch road 5 is due to the effect of load inductance; bear forward voltage and conducting; change of current branch road 5 resistance after conducting is very little; electric current in field suppression switch is quickly transferred in change of current branch road 5; make field suppression switch not have to disconnect under the very little condition of electric current or electric current, protect field suppression switch, the contact of field suppression switch is not fragile.After field suppression switch tripping operation, timely conducting demagnetization branch road 6, demagnetization branch road 6 reaches the effect of quick de-excitation.
Second embodiment
See Fig. 2, also comprise the conducting of change of current branch road in the present embodiment and switch off control circuit and demagnetization branch road turn-on control circuit.
The conducting of change of current branch road switches off control circuit for controlling the conducting turning off after maintaining conducting certain hour before field suppression switch disconnects of change of current branch road.
Demagnetization branch road turn-on control circuit closes at the change of current branch road conducting of having no progeny for controlling demagnetization branch road.
Wherein, described change of current branch road comprises thyristor V1; The conducting of described change of current branch road switches off control circuit and comprises controller 7, thyristor V3, diode V2, resistance R1 and electric capacity C1.
The negative electrode of described thyristor V1 is connected with the described other end of field suppression switch 3, and the anode of thyristor V1 is connected with the DC terminal of thyristor rectifier bridge 2.
The anode of diode V2 is connected with the described other end of field suppression switch, and the negative electrode of diode V2 is connected with one end of resistance R1, and the other end of resistance R1 is connected with one end of electric capacity C1, and the other end of electric capacity C1 is connected with the second DC output end of thyristor rectifier bridge 2.
Described thyristor V3 is in parallel with diode V2, and the negative electrode of thyristor V3 is connected with the described other end of field suppression switch 3.
The control end of thyristor V1 is all connected with controller 7 with the control end of thyristor V3.
Described demagnetization branch road comprises resistance R4 and thyristor V4; Described demagnetization branch road turn-on control circuit comprises resistance R2, resistance R3, diode V5 and trigger TR.
Resistance R4 connects with thyristor V4 afterwards and change of current branch circuit parallel connection, and the anode of thyristor V4 is connected with the second DC output end of thyristor rectifier bridge 2.
After resistance R2, resistance R3 and diode V5 series connection again with change of current branch circuit parallel connection, and the anode of diode V5 is connected with the second DC output end of thyristor rectifier bridge 2.
The triggering signal input of trigger TR is connected between resistance R2 and resistance R3, and the triggering signal output of trigger is connected with the control end of thyristor V4.
Described field suppression switch 3 is the mechanical contact of circuit breaker.Controller 7 can be made up of relay and the time relay, or is made up of the controller or integrating analog devices etc. of other parts as having CPU, and deadline control circui, this circuit can be completed by known technology.
Below in conjunction with accompanying drawing 2, set forth the operation principle of the present embodiment:
During normal excitation, field suppression switch 3 conducting, load upper end is just, lower end is negative, and thyristor V1, thyristor V3, thyristor V4 and diode V5 all turn off, diode V2 conducting, and electric capacity C1 charges, and on electric capacity C1, terminal voltage is just, lower terminal voltage is negative.
When field suppression switch 3 needs to turn off, controller 7 exports trigger impulse to the automatically controlled end of circuit breaker and thyristor V1 control end simultaneously.The mechanical contact of circuit breaker starts action, but does not really disconnect, the curent change now in load, load-sensing goes out lower just upper negative induced voltage, thyristor V1 conducting, the circuit on field suppression switch 3 flows to rapidly change of current branch road, and field suppression switch trips under low current or zero current condition.
After field suppression switch tripping operation, voltage in load become upper negative under just, this Time Controller exports conducting trigger impulse to thyristor V3, the conducting trigger impulse of thyristor V3 generally lags behind V1 conduction pulses 100ms, thyristor V3 conducting, voltage during thyristor V3 firm conducting on electric capacity C1 is still gone up just lower negative, and now thyristor V1 turns off under the effect of reverse voltage.Capacitor discharge reverse charging afterwards.
Reverse voltage on electric capacity C1 rises rapidly, and when voltage reaches certain value, thyristor V4 is triggered conducting.The conducting voltage of thyristor V4 is provided by resistance R2, resistance R3, diode V5 and trigger TR.When reverse voltage exceedes certain value, during as exceeded thyristor rectifier bridge nominal input voltage effective value 2 times, trigger action, triggers thyristor V4 conducting.The electric current of excitation winding, by thyristor V4 and de-excitation resistance R4 afterflow, reduces rapidly, reaches the effect of quick de-excitation.
The present invention is not limited to aforesaid embodiment.The present invention expands to any new feature of disclosing in this manual or any combination newly, and the step of the arbitrary new method disclosed or process or any combination newly.
Claims (5)
1. a field suppression switch protective device, the three-phase alternating current output of excitation transformer is connected with the three-phase alternating current electrical input of thyristor rectifier bridge, first DC output end of thyristor rectifier bridge is connected with one end of field suppression switch, the other end of field suppression switch is connected with one end of load, and the other end of load is connected with the second DC output end of thyristor rectifier bridge;
It is characterized in that, also comprise change of current branch road and demagnetization branch road;
One end of described change of current branch road is connected with the described other end of field suppression switch, and the other end of change of current branch road is connected with the second DC output end of thyristor rectifier bridge; One end of demagnetization branch road is connected with the described other end of field suppression switch, and the other end of demagnetization branch road is connected with the second DC output end of thyristor rectifier bridge;
Described change of current branch road is used for conducting before field suppression switch disconnects and turns off after maintaining conducting certain hour;
Described demagnetization branch road is used for closing at the change of current branch road conducting of having no progeny.
2. a kind of field suppression switch protective device according to claim 1, is characterized in that, also comprises the conducting of change of current branch road and switches off control circuit and demagnetization branch road turn-on control circuit;
The conducting of change of current branch road switches off control circuit for controlling the conducting turning off after maintaining conducting certain hour before field suppression switch disconnects of change of current branch road;
Demagnetization branch road turn-on control circuit closes at the change of current branch road conducting of having no progeny for controlling demagnetization branch road.
3. a kind of field suppression switch protective device according to claim 2, is characterized in that, described change of current branch road comprises the first thyristor; The conducting of described change of current branch road switches off control circuit and comprises controller, the second thyristor, the first diode, the first resistance and electric capacity;
The negative electrode of described first thyristor is connected with the described other end of field suppression switch, and the anode of the first thyristor is connected with the second DC terminal of thyristor rectifier bridge;
The anode of the first diode is connected with the described other end of field suppression switch, the negative electrode of the first diode is connected with one end of the first resistance, the other end of the first resistance is connected with one end of electric capacity, and the other end of electric capacity is connected with the second DC output end of thyristor rectifier bridge;
Described second thyristor and the first diodes in parallel, and the negative electrode of the second thyristor is connected with the described other end of field suppression switch;
The control end of the first thyristor is all connected with controller with the control end of the second thyristor.
4. a kind of field suppression switch protective device according to claim 3, is characterized in that, described demagnetization branch road comprises the second resistance and the 3rd thyristor; Described demagnetization branch road turn-on control circuit comprises the 3rd resistance, the 4th resistance, the second diode and trigger;
With change of current branch circuit parallel connection after second resistance and the 3rd Thyristors in series, the anode of the 3rd thyristor is connected with the second DC output end of thyristor rectifier bridge;
After 3rd resistance, the 4th resistance and the second Diode series again with change of current branch circuit parallel connection, and the anode of the second diode is connected with the second DC output end of thyristor rectifier bridge;
The triggering signal input of trigger is connected between the 3rd resistance and the 4th resistance, and the triggering signal output of trigger is connected with the control end of the 3rd thyristor.
5. a kind of field suppression switch protective device according to claim 3, is characterized in that, described field suppression switch is the mechanical contact of circuit breaker; Described controller is used for exporting trigger impulse simultaneously to the automatically controlled end of described circuit breaker and the first thyristor control end and extending certain hour, backward 3rd thyristor control end export conducting trigger impulse.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510605084.6A CN105119544A (en) | 2015-09-22 | 2015-09-22 | Magnetic blow-out switch protective device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510605084.6A CN105119544A (en) | 2015-09-22 | 2015-09-22 | Magnetic blow-out switch protective device |
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| Publication Number | Publication Date |
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| CN105119544A true CN105119544A (en) | 2015-12-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510605084.6A Pending CN105119544A (en) | 2015-09-22 | 2015-09-22 | Magnetic blow-out switch protective device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111800041A (en) * | 2020-08-06 | 2020-10-20 | 广东电网有限责任公司电力科学研究院 | Constant-power de-excitation device and method, storage medium and terminal equipment |
| EP4033657A1 (en) * | 2021-01-25 | 2022-07-27 | ABB Schweiz AG | De-exciting system for inductive circuits |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| EP0173077A2 (en) * | 1984-07-27 | 1986-03-05 | S O "Bulgarski Darjavni Jelesnizi" | AC supply device to actuate and to brake a DC train drive in a regenerator mode |
| CN85201172U (en) * | 1985-04-01 | 1986-06-25 | 中国科学院合肥等离子体物理研究所 | Field discharge device of generator |
| CN2588638Y (en) * | 2002-07-18 | 2003-11-26 | 科大创新股份有限公司科聚分公司 | Electronic coverting energy-switching magnet-eliminating protector for generator |
| CN1581675A (en) * | 2004-05-14 | 2005-02-16 | 国电自动化研究院 | Generator controlled follow-current type de-excitation circuit |
| CN1829028A (en) * | 2005-10-19 | 2006-09-06 | 葛洲坝水力发电厂 | Passive zero breaking automatic de-excitation device and method |
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2015
- 2015-09-22 CN CN201510605084.6A patent/CN105119544A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0173077A2 (en) * | 1984-07-27 | 1986-03-05 | S O "Bulgarski Darjavni Jelesnizi" | AC supply device to actuate and to brake a DC train drive in a regenerator mode |
| CN85201172U (en) * | 1985-04-01 | 1986-06-25 | 中国科学院合肥等离子体物理研究所 | Field discharge device of generator |
| CN2588638Y (en) * | 2002-07-18 | 2003-11-26 | 科大创新股份有限公司科聚分公司 | Electronic coverting energy-switching magnet-eliminating protector for generator |
| CN1581675A (en) * | 2004-05-14 | 2005-02-16 | 国电自动化研究院 | Generator controlled follow-current type de-excitation circuit |
| CN1829028A (en) * | 2005-10-19 | 2006-09-06 | 葛洲坝水力发电厂 | Passive zero breaking automatic de-excitation device and method |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111800041A (en) * | 2020-08-06 | 2020-10-20 | 广东电网有限责任公司电力科学研究院 | Constant-power de-excitation device and method, storage medium and terminal equipment |
| CN111800041B (en) * | 2020-08-06 | 2021-09-14 | 广东电网有限责任公司电力科学研究院 | Constant-power de-excitation device and method, storage medium and terminal equipment |
| EP4033657A1 (en) * | 2021-01-25 | 2022-07-27 | ABB Schweiz AG | De-exciting system for inductive circuits |
| WO2022156965A1 (en) * | 2021-01-25 | 2022-07-28 | Abb Schweiz Ag | De-exciting system for inductive circuits |
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Application publication date: 20151202 |