CN109599837A - A kind of voltage compensation type transformer excitation flow inhibition device - Google Patents
A kind of voltage compensation type transformer excitation flow inhibition device Download PDFInfo
- Publication number
- CN109599837A CN109599837A CN201910017408.2A CN201910017408A CN109599837A CN 109599837 A CN109599837 A CN 109599837A CN 201910017408 A CN201910017408 A CN 201910017408A CN 109599837 A CN109599837 A CN 109599837A
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- Prior art keywords
- voltage
- full wave
- bridge
- transformer
- direct current
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/04—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for transformers
- H02H7/045—Differential protection of transformers
- H02H7/0455—Differential protection of transformers taking into account saturation of current transformers
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
Abstract
The present invention relates to a kind of voltage compensation type transformer excitation flows to inhibit device, to inhibit excitation surge current, the device includes AC power source V1, Equivalent DC compensating voltage source Vc, first bridge full wave rectifier B1 and direct current reactor L1, the first input end of the first bridge full wave rectifier B1 is connect with AC power source V1, second input terminal is connect with the primary side of main transformer T2, the Equivalent DC compensating voltage source Vc is using AC power source V1 as input, it is connected in parallel on after connecting with direct current reactor L1 between the first output end and second output terminal of the first bridge full wave rectifier B1.Compared with prior art, the present invention have on system without influence, simple, the high reliability without additional control inspection circuit, loss of voltage compensation, structure.
Description
Technical field
The present invention relates to field of power systems, inhibit to fill more particularly, to a kind of voltage compensation type transformer excitation flow
It sets.
Background technique
Power transformer is effectively transmitted to pass to electric energy as power transmission and transformation key main equipment, reliable and stable operation
It is important.When steady-state operation, the exciting current of transformer only has the 1%~2% of rated current, but when transformer in zero load investment or
During Removal of external faults system voltage restores, it is also easy to produce very big excitation surge current, peak value is up to the several of rated current
Again to tens times.Biggish excitation surge current may cause differential protection misoperation, make the insulation ag(e)ing of transformer, and can be to change
The structure of depressor itself and its equipment belt for closing on greatly impact, influence transformer reliably, stable operation.
Since excitation surge current brings various detrimental effects to the operation of transformer, a variety of reduction excitations are proposed
All in all the method shoved can be divided into two major classes: internal control method passes through that is, from the excitation principle of transformer core
Change the internal structure of transformer to achieve the purpose that cut down excitation surge current；External control methods take suppression outside transformer
Circuit processed or control method are to cut down excitation surge current.Currently, internal control method has virtual air-gap method and changes the former and deputy side of transformer
The distribution etc. of winding, but due to inside transformer structure to be changed, and design of transformer and manufacture difficulty are increased, generally not
Using such method.External control method, which has, installs capacitor method, switch shutting-brake control method, interior plug-in additional in the low-pressure side of transformer
Resistance method and series resistor method.Low-pressure side installs capacitor method, series resistor method and resistor insertion method additional and requires to increase in circuit
Additional switch and control system guarantees to inhibit device to exit in time after excitation surge current is suppressed；Switching shutting-brake control rule needs
Increase Detection & Controling circuit, and control complexity, accuracy is difficult to grasp.
Therefore, it is necessary to a kind of on system stable operation without influence, not need the excitation for increasing switch with detection control circuit
Incoming current suppression device guarantees that transformer is stable, reliably runs.
Summary of the invention
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide a kind of voltage compensation types to become
Depressor magnetizing inrush current suppression device.
The purpose of the present invention can be achieved through the following technical solutions:
A kind of voltage compensation type transformer excitation flow inhibition device, to inhibit excitation surge current, which includes exchange
Power supply V1, Equivalent DC compensating voltage source Vc, the first bridge full wave rectifier B1 and direct current reactor L1, first bridge
The first input end of formula full-wave rectifier B1 is connect with AC power source V1, and the primary side of the second input terminal and main transformer T2 connect
It connects, the Equivalent DC compensating voltage source Vc is connected in parallel on after connecting with direct current reactor L1 using AC power source V1 as input
Between the first output end and second output terminal of first bridge full wave rectifier B1.
The Equivalent DC compensating voltage source Vc is made of isolating transformer T1 and the second full wave bridge rectifier B2, institute
The isolating transformer T1 primary side one end stated is connect with AC power source V1, and other end ground connection, secondary side is as the second full wave bridge type
First output end of the input of rectifier B2, the second full wave bridge rectifier B2 passes through the first bridge-type of direct current reactor L1
The first output end of full-wave rectifier B1 connects, and the second output terminal of the second full wave bridge rectifier B2 and the first full-wave bridge are whole
Flow the second output terminal connection of device B1.
The first bridge full wave rectifier B1 is made of 4 diodes D1, D2, D3, D4, second full-wave bridge
Formula rectifier B2 is made of 4 diodes D5, D6, D7, D8.
When transformer zero load investment or Removal of external faults after system voltage restore during when, transformer core by
Gradually to saturation state, line current is risen rapidly, diode D1, D4 conducting in the first bridge full wave rectifier B1, route
Electric current flows through direct current reactor L1, and exciting current is suppressed, and operating status at this time is limited current state；
When excitation surge current is suppressed, direct current reactor L1 starts to discharge the energy in limited current state storage, voltage reversal,
Diode D1, D2, D3, D4 are all turned on, and inhibit device circuit afterflow, both end voltage is in short circuit state close to 0, main
Transformer T2 is connected directly with AC power source V1, and row state at this time is freewheeling state；
When direct current reactor L1 stores depleted of energy, to transformer charging complete, circuit enters stable state, diode
D1, D2, D3, D4 remain conducting, and device is inhibited to be in short-circuit condition, and main transformer T2 is directly connect with AC power source V1,
Do not influence load terminal voltage and electric current.
In stable state, Equivalent DC compensating voltage source Vc to compensate due to before the first bridge full wave rectifier B1 to
The no-load voltage ratio N value of voltage drop caused by the coil resistance R1 of conducting voltage and direct current reactor L1, isolating transformer T1 depends on
The amplitude of voltage drop.
Compared with prior art, the invention has the following advantages that
One, device is inhibited to be connected by the automatic of diode by direct current reactor L1 access system when no-load transformer is put into
The middle generation for inhibiting excitation surge current when steady-state operation, inhibits device to be considered short circuit, has no effect to system operation.
Two, it does not need to increase any additional control and detection circuit when actual motion.
Three, direct current compensation voltage source can compensate due to before bridge rectifier diode to conducting voltage and direct current reactor
The loss of voltage caused by coil resistance.
Four, structure is simple, high reliablity.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the embodiment of the present invention.
Fig. 2 is the equivalent schematic that the present invention works in limited current state.
Fig. 3 is the equivalent schematic of the invention worked in freewheeling state.
Specific embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
Embodiment
As shown in Figure 1, the present invention provides a kind of voltage compensation type transformer excitation flow inhibition device, specifically:
The device is series between main transformer T2 primary side and AC power source V1, by direct current reactor L1, the first bridge-type
Full-wave rectifier B1, isolating transformer T1 and the second bridge full wave rectifier B2 composition, diode D1, D2, D3, D4 constitute first
Bridge full wave rectifier B1, diode D5, D6, D7, D8 constitute the second bridge full wave rectifier B2, isolating transformer T1 and second
Bridge full wave rectifier B2 constitutes Equivalent DC compensating voltage source Vc, generates offset voltage, direct current reactor L1 and Equivalent DC
It is in parallel with the first bridge full wave rectifier B1 after compensating power supply Vc series connection.
In conjunction with Fig. 1, Fig. 2 and Fig. 3, the working principle of the invention is:
When switch K1 closes a floodgate, main transformer T2 zero load investment, transformer core gradually tends to saturation state, line current I
It rises rapidly, a pair of diodes D1, D4 conducting of the first bridge full wave rectifier B1, diode D1, direct current reactor L1, reactance
Device coil resistance R1, Equivalent DC compensating voltage source Vc, diode D4 are sequentially connected in series, and line current flows through direct current reactor L1,
The exciting current that main transformer T2 is generated is inhibited by direct current reactor L1, this operating status is known as limited current state, and equivalent circuit is such as
Shown in Fig. 2.
When excitation surge current is suppressed, direct current reactor L1 starts to discharge it in the energy stored by limited current state, and at this time two
Pole pipe D1, D2, D3, D4 are whole while switched on, inhibit circuit afterflow of shoving, and the voltage at the inhibition device both ends is close to zero,
It may be regarded as short circuit, transformer is directly connected with voltage source, this operating status is known as freewheeling state, and equivalent circuit is as shown in Figure 3.?
This stage, line current I flow through transformer by the diode be connected, automatic to get around direct current reactor L1, direct current reactor L1
Discharge the energy of storage, and voltage reversal.
When L1 stores depleted of energy, to transformer charging complete, circuit enters stable state, and direct current compensation voltage source can be with
Compensation before bridge rectifier diode to voltage caused by the coil resistance of conducting voltage and direct current reactor as declining, diode
D1-D4 remains on state, and equivalent circuit diagram is identical as freewheeling state.This stage inhibits device to be regarded as short circuit, main transformer pressure
Device T2 is directly connected to power supply.Load side voltage and current waveform are not inhibited device influence when stable state.
When stable state, direct current compensation voltage source Vc compensation due to before bridge rectifier diode to conducting voltage and direct current
Voltage drop caused by the coil resistance R1 of anti-device, the value of isolating transformer no-load voltage ratio N depend on the amplitude of voltage drop.
Claims (5)
1. a kind of voltage compensation type transformer excitation flow inhibits device, to inhibit excitation surge current, which is characterized in that the device
Including AC power source (V1), Equivalent DC compensating voltage source (Vc), the first bridge full wave rectifier (B1) and direct current reactor
(L1), the first input end of first bridge full wave rectifier (B1) is connect with AC power source (V1), the second input terminal with
The primary side of main transformer (T2) connects, the Equivalent DC compensating voltage source (Vc) using AC power source (V1) as inputting,
Be connected in parallel on after connecting with direct current reactor (L1) the first bridge full wave rectifier (B1) the first output end and second output terminal it
Between.
2. a kind of voltage compensation type transformer excitation flow according to claim 1 inhibits device, which is characterized in that described
Equivalent DC compensating voltage source (Vc) be made of isolating transformer (T1) and the second full wave bridge rectifier (B2), it is described every
It is connect from transformer (T1) primary side one end with AC power source (V1), other end ground connection, secondary side is whole as the second full wave bridge type
The input of device (B2) is flowed, the first output end of second full wave bridge rectifier (B2) passes through direct current reactor (L1) first
First output end of bridge full wave rectifier (B1) connects, the second output terminal and the first bridge of the second full wave bridge rectifier (B2)
The second output terminal of formula full-wave rectifier (B1) connects.
3. a kind of voltage compensation type transformer excitation flow according to claim 2 inhibits device, which is characterized in that described
The first bridge full wave rectifier (B1) be made of 4 diodes (D1, D2, D3, D4), second full wave bridge rectifier
(B2) it is made of 4 diodes (D5, D6, D7, D8).
4. a kind of voltage compensation type transformer excitation flow according to claim 3 inhibits device, which is characterized in that work as change
Depressor zero load investment or Removal of external faults after system voltage restore during when, transformer core gradually tends to saturation shape
State, line current rise rapidly, and diode (the D1, D4) conducting in the first bridge full wave rectifier (B1), line current flows through
Direct current reactor (L1), exciting current are suppressed, and operating status at this time is limited current state；
When excitation surge current is suppressed, direct current reactor (L1) starts to discharge the energy in limited current state storage, voltage reversal, and two
Pole pipe (D1, D2, D3, D4) all turns on, and inhibits device circuit afterflow, both end voltage is in short circuit state close to 0, main
Transformer (T2) is connected directly with AC power source (V1), and row state at this time is freewheeling state；
When direct current reactor (L1) stores depleted of energy, to transformer charging complete, circuit enters stable state, diode (D1,
D2, D3, D4) remain conducting, inhibit device to be in short-circuit condition, main transformer (T2) directly connects with AC power source (V1)
It connects, does not influence load terminal voltage and electric current.
5. a kind of voltage compensation type transformer excitation flow according to claim 4 inhibits device, which is characterized in that steady
When determining state, Equivalent DC compensating voltage source (Vc) is to compensate due to the first bridge full wave rectifier (B1) forward direction conducting voltage
The no-load voltage ratio N value of voltage drop caused by coil resistance (R1) with direct current reactor (L1), isolating transformer (T1) depends on electricity
The amplitude of pressure drop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910017408.2A CN109599837B (en) | 2019-01-08 | 2019-01-08 | Voltage compensation type transformer excitation inrush current suppression device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910017408.2A CN109599837B (en) | 2019-01-08 | 2019-01-08 | Voltage compensation type transformer excitation inrush current suppression device |
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| Publication Number | Publication Date |
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| CN109599837A true CN109599837A (en) | 2019-04-09 |
| CN109599837B CN109599837B (en) | 2020-06-02 |
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| CN201910017408.2A Active CN109599837B (en) | 2019-01-08 | 2019-01-08 | Voltage compensation type transformer excitation inrush current suppression device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112865068A (en) * | 2019-11-27 | 2021-05-28 | 中国船舶重工集团公司第七一九研究所 | Linear attenuation voltage compensation control method for dual-power switching device |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101034803A (en) * | 2007-01-23 | 2007-09-12 | 南京师范大学 | Failure current limit method and device based on the rectifying bridge and bidirectional switch switching |
| CN201918719U (en) * | 2011-01-18 | 2011-08-03 | 南京师范大学 | Exciting-surge-inhibiting circuit for three-phase transformers |
| CN201946971U (en) * | 2011-01-18 | 2011-08-24 | 南京师范大学 | Magnetizing inrush current suppression circuit in single-phase transformer |
| CN102412560A (en) * | 2011-12-27 | 2012-04-11 | 保定天威集团有限公司 | Single-phase-transformer-based inrush current research method and device |
| CN102882200A (en) * | 2012-10-31 | 2013-01-16 | 东南大学 | Bridge type fault current limiter with current balancing effect |
| CN104779596A (en) * | 2015-04-20 | 2015-07-15 | 国家电网公司 | Direct-current reactor type magnetizing inrush current suppressor |
-
2019
- 2019-01-08 CN CN201910017408.2A patent/CN109599837B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101034803A (en) * | 2007-01-23 | 2007-09-12 | 南京师范大学 | Failure current limit method and device based on the rectifying bridge and bidirectional switch switching |
| CN201918719U (en) * | 2011-01-18 | 2011-08-03 | 南京师范大学 | Exciting-surge-inhibiting circuit for three-phase transformers |
| CN201946971U (en) * | 2011-01-18 | 2011-08-24 | 南京师范大学 | Magnetizing inrush current suppression circuit in single-phase transformer |
| CN102412560A (en) * | 2011-12-27 | 2012-04-11 | 保定天威集团有限公司 | Single-phase-transformer-based inrush current research method and device |
| CN102882200A (en) * | 2012-10-31 | 2013-01-16 | 东南大学 | Bridge type fault current limiter with current balancing effect |
| CN104779596A (en) * | 2015-04-20 | 2015-07-15 | 国家电网公司 | Direct-current reactor type magnetizing inrush current suppressor |
Non-Patent Citations (1)
| Title |
|---|
| 邹必昌: "变压器空载投入时励磁涌流抑制新方法研究", 《中国农村水利水电》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112865068A (en) * | 2019-11-27 | 2021-05-28 | 中国船舶重工集团公司第七一九研究所 | Linear attenuation voltage compensation control method for dual-power switching device |
| CN112865068B (en) * | 2019-11-27 | 2023-02-28 | 中国船舶重工集团公司第七一九研究所 | Linear attenuation voltage compensation control method for dual-power switching device |
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| CN109599837B (en) | 2020-06-02 |
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