CN2504820Y - Passive demagnetization electronic switch thyrister - Google Patents
Passive demagnetization electronic switch thyrister Download PDFInfo
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- CN2504820Y CN2504820Y CN 01248446 CN01248446U CN2504820Y CN 2504820 Y CN2504820 Y CN 2504820Y CN 01248446 CN01248446 CN 01248446 CN 01248446 U CN01248446 U CN 01248446U CN 2504820 Y CN2504820 Y CN 2504820Y
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Abstract
The utility model relates to a passive de excitation electronic switch of a thyristor, consisting of an after-flow circuit component of the thyristor electronic switch and an automatic control component. The after-flow circuit component of the thyristor electronic switch which consists of an isolating diode D, a thyristor electronic switch DK and a current monitoring device is arranged in and connected with an after-flow branch of the positive and negative ends of a silicon controlled rectifier. The working characteristics of the electronic switch are as follows: the electronic switch is always kept in an open circuit status, only when de excitation occurs caused by an accident, the electronic switch can be conducted to turn off an excitation power supply, and then the electronic switch can be automatically disconnected to do de excitation of the generator rotator. The utility model is another significant innovative technique achievement since the technology of the passive de excitation switch of an excited generator has invented. The utility model has the advantages of advance technology, good performance, high application value and wide market prospect.
Description
The utility model relates to the passive demagnetization electronic switch of a kind of thyristor.Belong to from the shunt excitation passive demagnetization electronic switching technology field of generating electricity, it is the product that modern age, electronic technology combined with passive demagnetization control technology.
In the past, ancient demagnetization mode, its field suppression switch is to be serially connected in the Generator's Rotor Circuit, when the field suppression switch of Generator's Rotor Circuit disconnected, the arc voltage at its switch contact two ends tended to up to more than the 3-4 kilovolt.At present, international, the domestic powerful quick de-excitation switch of mechanical type that almost all adopts has only indivedual units to adopt controllable silicon formula field suppression switch.But, the powerful field suppression switch of which kind of high arc voltage no matter, because of it is arranged in the generator amature energized circuit, its current interruption process all can cause the switching overvoltage of energized circuit, this safety to energizing apparatus and field suppression switch self is all extremely unfavorable.
Since the appearance of passive demagnetization automatic controller innovative technology, controllable silicon has been obtained tangible improvement from the demagnetization condition of shunt dynamo, and its Control essentials is: disconnect field power supply earlier, then disconnect field suppression switch.Like this, not only reduced the field suppression switch arc voltage greatly, and the switch arc voltage is limited in below the 1500V, and also permission changes the mode of connection of field suppression switch, by the major loop of rotor, reconfiguration is in the additional afterflow parallel branch of rotor.Therefore, it also is a thyristor type electronic switch The application of new technique, and valuable condition is provided.
The purpose of this utility model is to provide a kind of thyristor passive demagnetization electronic switch, it is the innovative technology based on passive demagnetization automatic controller, conducting by the electronic switch in the rotor afterflow branch road of setting up, the power supply of field rectifier is turn-offed in advance, and the electronic switch that then disconnects again in the rotor freewheeling circuit carries out demagnetization.This first outage source is the mode of demagnetization then, the passive demagnetization of meaning.Under passive demagnetization condition, the position of its field suppression switch has two: one is located in the rotor-exciting major loop; It two is located in the additional afterflow branch road of rotor, though the two position difference, its cutout demagnetization effect is the same, its Xing Li, except that the difference of fraud very big.Because, cancelled the field suppression switch of excitation main circuit, simplified the excitation system tie lines, simplified the operation of field suppression switch, simplified the condition of work of electronic switch, simplified the structure and the design of electronic switch.Generally speaking, field suppression switch if can be added in the afterflow branch road to rotor by rotor-exciting major loop reconfiguration, and make continued flow switch and field suppression switch, two combine into one for both, and that is best selection.
Electronic switch as afterflow and demagnetization are integrated at present, has thyratron transistor formula electronic switch only, is called for short the thyristor electronic switch.It can be by its base current mode of control, and electronic switch is had by disconnected to logical and by leading to the two kinds of operating states of breaking.Because, be located at the thyristor electronic switch in the rotor afterflow branch road, during its conducting afterflow, the function in outage source is arranged, when it disconnects afterflow, the function that makes the rotor demagnetization is arranged again.Therefore, the thyristor electronic switch is located in the afterflow branch road, not only can replace controllable silicon formula continued flow switch, and it can replace the field suppression switch of excitation main circuit again, and it has two kinds of functions of outage source and disconnected current source.But, controllable silicon formula electronic switch, its shutoff know-why requirement must add the electronic switch of one a group of power capacitor power supply and a controllable silicon formula in addition, to apply reverse voltage, could turn-off.Its structure is comparatively complicated, and operation maintenance is very inconvenient.
The purpose of this utility model is achieved through the following technical solutions:
It is to be made of thyristor electronic switch freewheeling circuit assembly and passive demagnetization automatic control unit.Thyristor electronic switch freewheeling circuit assembly is made up of isolating diode D1, thyristor electronic switch DK and current monitoring device DLQ.It is connected to the positive and negative two ends of thyristor excitation rectifier KZQ.Additional afterflow branch road as generator amature.Automatic control unit is to open, stop assembly, passive demagnetization control warning component and continuous controller PLC assembly three able to programme by QTJ to constitute.
The passive demagnetization electronic switch of the utility model; it is static, contactless thyristor electronic switch; function with high speed switching electric current; and outage is flow through journey and is not had arc light, noiseless; there is not switching overvoltage again; the performance that these are good, to the demagnetizing time of shortening accident generator, the safety of protection main frame and energizing apparatus all is beneficial to.Add that it is arranged in additional afterflow branch road, long-term no current circulation can not generated heat, aging, and flow passage switch in short-term transships through-flow multiple height, and device lifetime is long, the operation maintenance amount is little.These advantages all can receive praises from customers.
In recent years, be on the increase from the quantity of shunt dynamo group, not only Hydropower Unit is glad adopts from shunt excitation, and thermoelectricity is also more and more from the shunt excitation unit, and passive demagnetization electronic switch will replace old-fashioned field suppression switch, and its market prospects are good, the using value height.
Fig. 1 is passive demagnetization electronic switch structural representation.
Fig. 2,3,4 is passive demagnetization automatic control unit structural representation.
Fig. 5 is from shunt dynamo excitation unit and passive demagnetization electronic switch structural representation.
Fig. 6 is a DK electronic switch control assembly structural representation.
Describe the utility model in detail below in conjunction with accompanying drawing:
Shown in Fig. 1,5, thyristor electronic switch freewheeling circuit assembly is by isolating diode D, and thyristor electronic switch DK and current monitoring device DLQ three form.It is connected to the positive and negative two ends of thyristor excitation rectifier KZQ.Additional afterflow branch road as generator amature.
Under the generator normal operation, because of no current in the additional afterflow branch road of its rotor, thyristor electronic switch DK, can be designed to flow passage switch in short-term, such condition of work not only can be omitted the heat dissipation ventilation problem of electronic switching device, and helps improving the through-current capability of electronic switch.To simplifying the electronic switch structure, prolong normal switching device life-span or the like, all be of great benefit to.
When the generating set accident demagnetization, when its protection outlet auxiliary relay BCJ normal opened contact was closed, the base stage of thyristor electronic switch DK had had optically-controlled signal, obtains enough big base current; Meanwhile, the pulse trigger power supply of silicon controlled rectifier KZQ is also cut, and is in the afterflow state, when its anode voltage enters negative half-cycle, makes thyristor electronic switch DK that forward voltage arranged.When having only these two conditions to possess simultaneously, thyristor electronic switch DK just understands saturation conduction.
When thyristor electronic switch DK saturation conduction, generator rotor current all flows through the afterflow branch road of additional electron switch, at this moment, reduces to null value because of silicon controlled rectifier KZQ electric current, ends less than its extinction current, and field power supply is disconnected.
After field power supply disconnects, when generator rotor current all flows through additional electron switch freewheeling circuit, its freewheel current monitor DLQ action, thyristor electronic switch DK is in the state of cut-offfing because of losing optically-controlled signal.
After thyristor electronic switch DK cut-offs, the self-induced e.m.f of generator amature winding, its nonlinear resistance of conducting and demagnetization drops to the residual voltage value up to generator unit stator voltage.
The passive demagnetization automatic control unit circuit structure of thyristor electronic switch is shown in accompanying drawing 2-4, and it opens, stops assembly by QTJ, and passive demagnetization control warning component and continuous controller PLC assembly three able to programme constitute.
Under the generator normal operation, the thyristor electronic switch DK in the additional freewheeling circuit of its rotor remains on the state of cut-offfing, and the automatic control unit of electronic switch all is ready, and has only four power supply prisons to show lamp LD1, LD2, LD3, LD4 Chang Liang.
When generating set accident, when its protection outlet auxiliary relay BCJ normal opened contact is closed, the action of QTJ starting relay, its normally closed contact disconnects the pulse trigger power supply of silicon controlled rectifier KZQ; Simultaneously, its normal opened contact closure, the light-emitting diodes of connecting thyristor electronic switch DK closes circuit.When there had been forward voltage and enough big base current in thyristor electronic switch DK two ends, electronic switch DK can saturation conduction, and field power supply is disconnected immediately.
When treating thyristor electronic switch DK saturation conduction, the current relay DLJ action of current monitor DLQ, its normal opened contact DLJ closure, make passive demagnetization exit relay MCJ action, its normally closed contact disconnects light-emitting diodes and closes circuit, make thyristor electronic switch DK base current reduce to null value, at this moment, thyristor electronic switch DK is in off-state.
Thyristor electronic switch DK makes generator amature carry out demagnetization after disconnecting.When eliminating magnetism of generator finishes, when its stator voltage is reduced to the residual voltage value, under-voltage replay DYJ action, time-delay through adjusting, automatically reset relay ZFJ action, make the action of QTJ slew relay, at this moment, the automatic control unit of thyristor electronic switch, involution immediately is to original armed state, and the pulse trigger power up of thyristor excitation rectifier is switched on, so far, the passive demagnetization process of generator accident is all over.
The circuit structure of thyristor electronic switch DK as shown in Figure 5, it is arranged in generator amature afterflow branch road, this afterflow branch road, by electronic switch DK, freewheel current monitor DLQ and isolating diode D three form.Its concrete mode of connection: the negative terminal of electronic switch DK, receive the end of afterflow monitor DLQ; The other end of DLQ connects the positive pole of isolating diode D; The negative pole of diode D connects the anode of silicon controlled rectifier KZQ; The anode of electronic switch DK is received the negative terminal of silicon controlled rectifier KZQ.The two ends of generator amature winding, FR is connected in parallel with nonlinear resistance; Then be connected in parallel with the positive and negative two ends of silicon controlled rectifier KZQ again.
The master component circuit structure of thyristor electronic switch DK is seen frame of broken lines in the accompanying drawing 5, and the anode of electronic switch DK connects the collector electrode of triode T2, T3, T4; The base terminal 1 of triode T2 joins with its control assembly 1D1 isolating diode terminals 1; The emitter of triode T2 connects the base stage of triode T3, T4; The terminals 2 of triode T2 emitter join with the terminals 2 of its control assembly resistance R 5; The emitter of triode T3 is received the end of flows resistance R6; The emitter of triode T4 is received the end of flows resistance R7; The other end of flows resistance R6, R7 is received the negative terminal of electronic switch DK; The terminals 3 of the negative terminal of electronic switch DK join with its control assembly isolating diode negative terminal terminals 3.
The circuit structure of thyristor electronic switch DK control assembly is seen in the frame of broken lines in the accompanying drawing 6, is described in detail as follows:
Electronic switch DK, the anode of its 24V control power supply, each end of connecting resistance R1, R3; The other end of R1 is received the collector electrode of optical coupler GO phototriode, an end of resistance R 2 and the base stage of triode T1; The emitter of optical coupler GO phototriode is connected to the negative terminal that DK electronic switch 24V controls power supply; The light-emitting diode of optical coupler GO, its terminals 4,5 join with terminals 4,5 in the passive demagnetization automatic control unit circuit of electronic switch DK; The other end of resistance R 3 is received the collector electrode of triode T1, an end of resistance R 4 and the anode of isolating diode 1D1; The negative terminal terminals 1 of isolating diode 1D1 join with the base terminal 1 of triode T2; One termination line end 2 of resistance R 5 joins with the emitter terminals 2 of triode T2; The other end of the emitter of triode T1, resistance R 2, R4, the 24V that receives electronic switch DK controls the negative terminal of power supply; The other end of the anode of isolating diode 1D2 and resistance R 5, the 24V that also receives electronic switch DK together controls power supply negative terminal; The negative terminal terminals 3 of isolating diode 1D2 join with electronic switch DK negative terminal terminals 3.
Claims (2)
1. the passive demagnetization electronic switch of thyristor, it is to be made of thyristor electronic switch freewheeling circuit assembly and passive demagnetization automatic control unit, automatic control unit is to open, stop assembly, passive demagnetization control warning component and continuous controller PLC assembly three able to programme by QTJ to constitute, it is characterized in that described thyristor electronic switch freewheeling circuit assembly is made up of isolating diode D, thyristor electronic switch DK and current monitoring device DLQ, it is connected to the positive and negative two ends of thyristor excitation rectifier KZQ as the additional afterflow branch road of generator amature.
2. the passive demagnetization electronic switch of thyristor according to claim 1 is characterized in that the negative terminal of described thyristor electronic switch DK receives the end of afterflow monitor DLQ; The other end of DLQ connects the positive pole of isolating diode D; The negative pole of diode D connects the anode of silicon controlled rectifier KZQ; The anode of electronic switch DK is received the negative terminal of silicon controlled rectifier KZQ.The two ends of generator amature winding, FR is connected in parallel with nonlinear resistance; Then be connected in parallel with the positive and negative two ends of silicon controlled rectifier KZQ again;
Thyristor electronic switch DK circuit comprises its main circuit and control circuit, the constituting of main circuit: the anode of electronic switch DK connects the collector electrode of triode T2, T3, T4; The base terminal 1 of triode T2 joins with its control assembly 1D1 isolating diode terminals 1; The emitter of triode T2 connects the base stage of triode T3, T4; The terminals 2 of triode T2 emitter join with the terminals 2 of its control assembly resistance R 5; The emitter of triode T3 is received the end of flows resistance R6; The emitter of triode T4 is received the end of flows resistance R7; The other end of flows resistance R6, R7 is received the negative terminal of electronic switch DK; The terminals 3 of the negative terminal of electronic switch DK join with its control assembly isolating diode negative terminal terminals 3;
Electronic switch DK control circuit constitutes: electronic switch DK, the anode of its 24V control power supply, each end of connecting resistance R1, R3; The other end of R1 is received the collector electrode of optical coupler GO phototriode, an end of resistance R 2 and the base stage of triode T1; The emitter of optical coupler GO phototriode is connected to the negative terminal that DK electronic switch 24V controls power supply; The light-emitting diode of optical coupler GO, its terminals 4,5 join with terminals 4,5 in the passive demagnetization automatic control unit circuit of electronic switch DK; The other end of resistance R 3 is received the collector electrode of triode T1, an end of resistance R 4 and the anode of isolating diode 1D1; The negative terminal terminals 1 of isolating diode 1D1 join with the base terminal 1 of triode T2; One termination line end 2 of resistance R 5 joins with the emitter terminals 2 of triode T2; The other end of the emitter of triode T1, resistance R 2, R4, the 24V that receives electronic switch DK controls the negative terminal of power supply; The other end of the anode of isolating diode 1D2 and resistance R 5, the 24V that also receives electronic switch DK together controls power supply negative terminal; The negative terminal terminals 3 of isolating diode 1D2 join with electronic switch DK negative terminal terminals 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01248446 CN2504820Y (en) | 2001-06-29 | 2001-06-29 | Passive demagnetization electronic switch thyrister |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01248446 CN2504820Y (en) | 2001-06-29 | 2001-06-29 | Passive demagnetization electronic switch thyrister |
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| Publication Number | Publication Date |
|---|---|
| CN2504820Y true CN2504820Y (en) | 2002-08-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01248446 Expired - Fee Related CN2504820Y (en) | 2001-06-29 | 2001-06-29 | Passive demagnetization electronic switch thyrister |
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| Country | Link |
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| CN (1) | CN2504820Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105259447A (en) * | 2015-11-05 | 2016-01-20 | 马秀丽 | Tester for testing field suppression jumper device of generator rotor |
-
2001
- 2001-06-29 CN CN 01248446 patent/CN2504820Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105259447A (en) * | 2015-11-05 | 2016-01-20 | 马秀丽 | Tester for testing field suppression jumper device of generator rotor |
| CN105259447B (en) * | 2015-11-05 | 2017-12-12 | 马秀丽 | A kind of generator rotor de-excitation jumper device experiment tester |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |