CN202721451U - Apparatus for suppressing excitation surge current by using chopper control - Google Patents
Apparatus for suppressing excitation surge current by using chopper control Download PDFInfo
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- CN202721451U CN202721451U CN 201220375533 CN201220375533U CN202721451U CN 202721451 U CN202721451 U CN 202721451U CN 201220375533 CN201220375533 CN 201220375533 CN 201220375533 U CN201220375533 U CN 201220375533U CN 202721451 U CN202721451 U CN 202721451U
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- transformer
- thyristor
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- contactor
- inrush current
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Abstract
The utility model relates to an apparatus for suppressing an excitation surge current by using chopper control. The apparatus comprises a thyristor host machine, a control unit, a voltage sensor, a current sensor, an input contactor, an output contactor and a cabinet body. Besides, the apparatus is characterized in that thyristor host machine consists of a thyristor set, a resistance-capacitance absorption circuit, a voltage equalizing circuit, and a trigger circuit; the thyristor host machine is connected in series between a power grid and a power transformer by the input contactor and the output contactor; the voltage sensor and the current sensor are arranged between the thyristor host machine and the input contactor; the detection signals from the voltage sensor and the current sensor are transmitted to the control unit that is connected with the thyristor host machine; and the output terminal of the thyristor host machine and the output contactor are connected to the power transformer. According to the utility model, there is no need to detect the residual magnetism of the iron core of the transformer and to change the winding structure of the transformer; the three phases of the transformer can be used in the power grid simultaneously, thereby meeting the requirement of a power supply department; and the excitation surge current can be completely eliminated and thus there is no impact during the grid connection process of the transformer.
Description
Technical field
The utility model belongs to power transformer control protection field, particularly a kind ofly is applied to power transformer suppresses transformer excitation flow when idle grid connection device.
Background technology
When power transformer drops into electrical network at idle-loaded switching-on; because the nonlinear characteristic of remanent magnetism, Flux saturation and core material in the transformer core can produce the sizable magnetizing inrush current of amplitude (being generally 6～8 times transformer rated current); the differential protection misoperation that may cause thus power transformer; also may cause winding deformation, thereby reduce transformer life.Because magnetizing inrush current contains a plurality of harmonic componentss and DC component, this will reduce the power system power supply quality, and the high order harmonic component in shoving also has extremely strong destruction to the sensitive equipment that is connected in the electric power system simultaneously.
At present, the method that solves in the industry the transformer excitation flow problem has a lot, and can be summarized as two classes: a class is hidden measure; One class is braking measure.
Hide measure, mainly contain the identification transformer excitation flow, adjust the manner of execution of relay protection device, allow to pass into transformer in the situation that magnetizing inrush current occurs.
Braking measure has: (1) external control, and the magnetizing inrush current when namely taking some remedial measures to cut down idle-loaded switching-on in the power transformer outside, main technology is the identification transformer flux at present, phase-splitting drops into electrical network; (2) internal control, by analyzing the excitation principle of transformer core, the internal structure that changes Transformer Winding is cut down magnetizing inrush current.
But solve the method that does not all suppress magnetizing inrush current in the transformer excitation flow prior art with chopper control at present.
Summary of the invention
The purpose of this utility model is to provide a kind of chopper control transformer inrush current suppression apparatus, it adopts the thyristor voltage regulation transformer inrush current suppression apparatus, be series between electrical network and the transformer, the angle of flow of control thyristor, the terminal voltage that is applied to the transformer input is raise gradually, the magnetic field of transformer inside is slowly set up, after transformer is stable, with switch transformer is directly dropped into electrical network again, thereby realize eliminating fully magnetizing inrush current.
The utility model adopts a kind of in the following components and parts: thyristor, GTO, IGBT, IGCT etc., all can realize chopper control.
The utility model thyristor voltage regulation transformer inrush current suppression apparatus, it comprises: thyristor main frame, control unit, voltage sensor, current sensor, input contactor, output contactor and cabinet, it is characterized in that: described thyristor main frame, it comprises: thyristor groups, resistance capaciting absorpting circuit, equalizer circuit, circuits for triggering; The thyristor main frame is series between electrical network and the power transformer by input contactor, output contactor; Between thyristor main frame and input contactor, be provided with voltage sensor, current sensor; The detection signal of voltage sensor, current sensor is all delivered to control unit; Control unit is connected with the thyristor main frame; Output and the output contactor of thyristor main frame are connected to power transformer.
Wherein, described thyristor groups comprises: thyristor and radiator.
Described resistance capaciting absorpting circuit comprises: resistance, electric capacity, resistor cartridge and capacitance bracket.
Described equalizer circuit comprises: grading resistor and resistor cartridge.
Described circuits for triggering comprise: circuits for triggering plate, triggering power panel.
Described control unit is the control section of thyristor voltage regulation transformer inrush current suppression apparatus, comprises master control borad, master control power panel, signal plate, operation interface.
Described voltage sensor is for amplitude, the phase place of measuring line voltage, for control unit provides measurement voltage signal.
Described current sensor is used for measuring the power transformer electric current, for control unit provides the measurement current signal.
Described input contactor and output contactor are used for the access of this device and withdraw from control.
Described cabinet is the complete installation of this device each several part equipment.
The utility model advantage is: the utility model does not need to detect transformer core remanent magnetism; Do not need to change transformer winding structure; Three-Phase Transformer can drop into electrical network synchronously, meets the requirement of power supply department; Can eliminate magnetizing inrush current fully, transformer and network process are without any impact.
Description of drawings:
Fig. 1 is the chopper control schematic diagram;
Fig. 2 is that the utility model chopper control magnetizing inrush current suppresses Method And Principle figure.
Fig. 3 is the utility model electric power system line chart.
Fig. 4 is the utility model chopper control transformer inrush current suppression apparatus block diagram.
Fig. 5-1 is the utility model chopper control transformer inrush current suppression apparatus external structure front view.
Fig. 5-2 is the utility model chopper control transformer inrush current suppression apparatus external structure end view.
Fig. 6-1 is the utility model chopper control transformer inrush current suppression apparatus internal structure front view (without door).
Fig. 6-2 is the utility model chopper control transformer inrush current suppression apparatus internal structure end view (without wallboard).
Fig. 6-3 is the utility model chopper control transformer inrush current suppression apparatus internal structure rearview (without wallboard).
Fig. 7 is the utility model course of work voltage, current waveform figure.
Number in the figure is:
1-thyristor main frame; 2-circuits for triggering; 3-control unit;
4-input contactor; 5-output contactor; 6-current sensor; 7-voltage sensor;
8-optical fiber;
QF1-input circuit breaker; QF2-bypass breaker;
20-chopping voltage-regulating device; 21-electrical network; 22-transformer; 23-switch.
Embodiment:
Below in conjunction with drawings and Examples, the utility model is described in further detail.
As shown in Figure 1, the principle of applied chopper control is in the utility model:
Regulate angle of flow α, the voltage in per cycle only has part output, and the effective value of output voltage will be lower than the input voltage effective value, has played the effect of regulation voltage.Corresponding different angle of flow α, output voltage is:
In the formula, U
0Be supply voltage effective value, U
1Be the output voltage effective value.
Be the afterflow angle; α-Trigger Angle; θ-angle of flow.
Adopt chopper control, output voltage can be regulated between 0～100% input voltage continuously.
As shown in Figure 2, chopping voltage-regulating device 20 is connected between electrical network 21 and the transformer 22; The input voltage of chopping voltage-regulating device 20 is line voltage; The output connection transformer 22 of chopping voltage-regulating device 20; The output voltage of chopping voltage-regulating device 20 is exactly the input terminal voltage of transformer 22.
Embodiment 1:
When adopting the utility model implementation, can with thyristor as the chopper control element, make chopping voltage-regulating device.Fig. 3 to Fig. 7 is the embodiment that the utility model is applied to a 6kV/6300kVA no-load transformer starting equipment.
Fig. 3 is the utility model electric power system line chart.Be a schematic diagram of a 6kV/6300kVA transformer of the utility model silicon controlled excitation incoming current suppression device starting.
Fig. 3 is to shown in Figure 7, and control principle and the process of a transformer of this device starting are as follows:
(1), according to the parameter of transformer, at the operation interface of this device relevant start-up parameters is set, transformer starting curve and initial start voltage are set, starting curve is the voltage curve that rises on the slow slope, initial voltage is 10%～50% rated voltage;
(2), after transformer is ready, by long-distance user control room or this locality---the starting button on this device sends starting command, and the control unit 3 control users of this device input circuit breaker Q F1 and close a floodgate;
(3), K2 in the control unit 3 control output contactor 5(of this device such as the accompanying drawing 3) close a floodgate K1 in control inputs contactor 4(such as the accompanying drawing 3) close a floodgate;
(4), the voltage sensor 7 of this device, current sensor 6 detect primary circuit voltage, electric current; Control unit 3 is according to electric current, magnitude of voltage, in conjunction with the starting curve that has arranged, begin to control the angle of flow of thyristor main frame 1, make output voltage (being the input voltage of transformer) from the initial voltage value of setting, slow slope, stably rising, the charging that realization is slow, level and smooth to transformer greatly reduces the impact to transformer.Because initial voltage value is low, according to the relation that no-load transformer combined floodgate magnetic flux is directly proportional with voltage, reduces voltage and just can reduce magnetic flux, thereby reach the effect that reduces magnetizing inrush current.
(5), when the output voltage (being the input voltage of transformer) of this device when reaching load voltage value, control unit 3 control user bypass breaker QF2 close a floodgate, after one section time-delay, K2 in the control output contactor 5(accompanying drawing 3) separating brake, K1 in the control inputs contactor 4(accompanying drawing 3) separating brake is controlled at last the user and is inputted circuit breaker Q F1 separating brake, and this moment, the transformer starting was finished, by the power supply of user's bypass breaker, this device withdraws from.
Such as Fig. 4-shown in Figure 7, the utility model thyristor voltage regulation transformer inrush current suppression apparatus, it comprises: thyristor main frame 1, control unit 3, input contactor 4, output contactor 5, current sensor 6, voltage sensor 7, input circuit breaker Q F1, bypass breaker QF2 and cabinet.
Thyristor main frame 1 is series between electrical network 21 and the power transformer 22 by input contactor 4, output contactor 5; Between thyristor main frame 1 and input contactor 4, be provided with voltage sensor 7, current sensor 6; The detection signal of voltage sensor 7, current sensor 6 is all delivered to control unit 3; Control unit 3 is connected with thyristor main frame 1; The output of thyristor main frame 1 and output contactor 5 are connected to power transformer 22.
Wherein, circuits for triggering 2 are made of circuits for triggering plate, triggering power panel;
Fig. 7 is the utility model course of work voltage, current waveform figure.The A point constantly is 5 closing moments of input circuit breaker Q F1, input contactor 4, output contactor among the figure; The B point begins chopper control constantly for chopper control transformer inrush current suppression apparatus of the present invention from starting voltage; The C point is the output 100% rated voltage moment; The D point is that bypass breaker QF2 is closed, and the chopper control transformer inrush current suppression apparatus is deactivated constantly, transformer access this moment electrical network, and the chopper control transformer inrush current suppression apparatus is finished the work.
Claims (8)
1. chopper control transformer inrush current suppression apparatus, it comprises: thyristor main frame, control unit, voltage sensor, current sensor, input contactor, output contactor and cabinet, it is characterized in that: described thyristor main frame, it comprises: thyristor groups, resistance capaciting absorpting circuit, equalizer circuit, circuits for triggering; The thyristor main frame is series between electrical network and the power transformer by input contactor, output contactor; Between thyristor main frame and input contactor, be provided with voltage sensor, current sensor; The detection signal of voltage sensor, current sensor is all delivered to control unit; Control unit is connected with the thyristor main frame; Output and the output contactor of thyristor main frame are connected to power transformer.
2. chopper control transformer inrush current suppression apparatus according to claim 1, it is characterized in that: described thyristor groups comprises: thyristor and radiator.
3. chopper control transformer inrush current suppression apparatus according to claim 1, it is characterized in that: described resistance capaciting absorpting circuit comprises: resistance, electric capacity, resistor cartridge and capacitance bracket.
4. chopper control transformer inrush current suppression apparatus according to claim 1, it is characterized in that: described equalizer circuit comprises: grading resistor and resistor cartridge.
5. chopper control transformer inrush current suppression apparatus according to claim 1, it is characterized in that: described circuits for triggering comprise: the circuits for triggering plate, trigger power panel.
6. chopper control transformer inrush current suppression apparatus according to claim 1 is characterized in that: described control unit, be the control section of thyristor voltage regulation transformer inrush current suppression apparatus, and comprise master control borad, master control power panel, signal plate, operation interface.
7. chopper control transformer inrush current suppression apparatus according to claim 1 is characterized in that: described voltage sensor is used for measuring amplitude, the phase place of line voltage, for control unit provides measurement voltage signal.
8. chopper control transformer inrush current suppression apparatus according to claim 1 is characterized in that: described current sensor is used for measuring the power transformer electric current, for control unit provides the measurement current signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220375533 CN202721451U (en) | 2012-07-30 | 2012-07-30 | Apparatus for suppressing excitation surge current by using chopper control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220375533 CN202721451U (en) | 2012-07-30 | 2012-07-30 | Apparatus for suppressing excitation surge current by using chopper control |
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| Publication Number | Publication Date |
|---|---|
| CN202721451U true CN202721451U (en) | 2013-02-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220375533 Expired - Lifetime CN202721451U (en) | 2012-07-30 | 2012-07-30 | Apparatus for suppressing excitation surge current by using chopper control |
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| Country | Link |
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| CN (1) | CN202721451U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102790405A (en) * | 2012-07-30 | 2012-11-21 | 能科节能技术股份有限公司 | Device and method for controlling magnetizing inrush current through wave chopping and voltage regulating |
| CN103701110A (en) * | 2014-01-10 | 2014-04-02 | 国家电网公司 | Alternating current demagnetizing method-based magnetizing rush current inhibiting method |
| CN105226610A (en) * | 2015-10-26 | 2016-01-06 | 三峡大学 | A kind of Transformer Close magnetizing inrush current arrester |
-
2012
- 2012-07-30 CN CN 201220375533 patent/CN202721451U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102790405A (en) * | 2012-07-30 | 2012-11-21 | 能科节能技术股份有限公司 | Device and method for controlling magnetizing inrush current through wave chopping and voltage regulating |
| CN102790405B (en) * | 2012-07-30 | 2015-07-01 | 能科节能技术股份有限公司 | Method for controlling magnetizing inrush current through wave chopping and voltage regulating |
| CN103701110A (en) * | 2014-01-10 | 2014-04-02 | 国家电网公司 | Alternating current demagnetizing method-based magnetizing rush current inhibiting method |
| CN103701110B (en) * | 2014-01-10 | 2016-05-11 | 国家电网公司 | A kind of excitation surge current inhibition method based on AC erasing method |
| CN105226610A (en) * | 2015-10-26 | 2016-01-06 | 三峡大学 | A kind of Transformer Close magnetizing inrush current arrester |
| CN105226610B (en) * | 2015-10-26 | 2017-11-24 | 三峡大学 | A kind of Transformer Close excitation surge current arrester |
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Legal Events
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 102400 Beijing Fangshan District, Chengguan Street, Guba Road, Area 1, No. 9 Patentee after: ENGKE TECHNOLOGY Co.,Ltd. Address before: 102400 Beijing Fangshan District, Chengguan Street, Guba Road, Area 1, No. 9 Patentee before: NANCAL ENERGY-SAVING TECHNOLOGY Co.,Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130206 |