CN104931840B - A kind of transformer neutral point DC current restraining device tests system - Google Patents
A kind of transformer neutral point DC current restraining device tests system Download PDFInfo
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- CN104931840B CN104931840B CN201510389963.XA CN201510389963A CN104931840B CN 104931840 B CN104931840 B CN 104931840B CN 201510389963 A CN201510389963 A CN 201510389963A CN 104931840 B CN104931840 B CN 104931840B
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- 238000012360 testing method Methods 0.000 title claims abstract description 43
- 230000007935 neutral effect Effects 0.000 title claims abstract description 30
- 230000000452 restraining effect Effects 0.000 title claims abstract description 19
- 239000003990 capacitor Substances 0.000 claims description 36
- 230000002441 reversible effect Effects 0.000 claims description 5
- 230000006798 recombination Effects 0.000 abstract description 5
- 238000005215 recombination Methods 0.000 abstract description 5
- 150000001875 compounds Chemical class 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 7
- 230000005540 biological transmission Effects 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 239000003112 inhibitor Substances 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 206010037660 Pyrexia Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
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Abstract
The present invention relates to a kind of transformer neutral point DC current restraining device to test system, including DC charging unit, AC charging unit, trigger valve Vaux, output and ground；The AC charging unit connects output terminal with one end of DC charging unit by trigger valve Vaux, and the output terminal is used to be connected with the high-pressure side of test product device TO；The AC charging unit connects ground terminal with the other end of DC charging unit, and the ground terminal is used to after being connected with the ground terminal of test product device TO be grounded；The DC charging unit is made of LC resonance circuit and DC switch-type convertor circuit；The AC charging unit is made of LC resonance circuit and alternating-current switch type convertor circuit.By and by alternating current and the compound generation of DC current and the equivalent recombination current of actual condition, and it is added on test product device to be examined accordingly to device.Realize the electric current to transformer neutral point DC current restraining device, voltage stress test.
Description
Technical field
The invention belongs to testing field, and in particular to a kind of transformer neutral point DC current restraining device tests system.
Background technology
When DC transmission system is run using single pole-ground return mode, it will cause DC transmission system current conversion station
Earthing pole nearby produces DC potential, which is determined by the size and soil resistivity of earthing pole injection DC current.Injection
Electric current is exactly direct current conveying electric current, and soil resistivity is higher, and current potential is also higher, and coverage is also wider.Direct current grounding pole
High potential will influence whether the earth mat current potential of AC Substation, make to flow in the transformer that AC Substation neutral ground runs
Cross DC current；That is, having shunted Partial DC conveying electric current, the DC current flowed through in transformer can cause transformer
Generation D.C. magnetic biasing.With the increase of single pole-ground return mode direct current transmission power, some flow through the change of larger DC component
Magnetic saturation can occur for depressor, cause on these transformers to occur during system normal operation that acutely vibration, noise are excessive, local
The problems such as fever, both influenced the safety of transformer in itself, can also influence the normal operation of power grid.
The magnetic bias saturation of transformer, which can cause in AC system, introduces substantial amounts of harmonic wave.The system that harmonic wave causes AC system
Sustained overvoltage, protective relaying maloperation, wave filter overload, single-pole reclosing mistake are produced when voltage waveform distortion, the conjunction long line of zero load
Secondary arc current increase and breaker recovery voltage increase in journey.D.C. magnetic biasing also results in transformer magnetizing current increase, transformation
Device consumes idle increase, declines System Reactive Power compensation device overload or system voltage.Another consequence of transformer bias saturation
It is to cause noise and vibration, while can also increases transformer active loss, it is possible to transformer is produced hot-spot and cause
Damage.
The mode that earth current influences operating transformer when eliminating the direct current transportation single-stage the earth method of operation, is in neutrality
Point series transformer neutral point DC current inhibitor.The device mainly has three kinds：Change based on neutral point series connected resistance
Depressor neutral point DC current inhibitor, the transformer neutral point DC current restraining device based on neutral point series-capacitor
With the transformer neutral point DC current restraining device based on neutral point reverse current injection method.
Wherein, the transformer neutral point DC current restraining device based on neutral point series-capacitor, as shown in Figure 1, logical
Cross the switch closing and switch opening of control high-speed switch so that the device has 2 kinds of methods of operation, i.e. neutral point metallic ground mode and neutrality
Point capacity earth mode.According to the requirement of electric system, device must complete the switching of the method for operation under different electric network states,
And in the case where the fault conditions such as three-phase imbalance occur for power grid, the bypass protection of device can be acted correctly.
Therefore, it is necessary to a kind of transformer neutral point DC current restraining device to test system, simulates the transformation of different amplitudes
The current component of device neutral point, generation and the equivalent recombination current of actual condition, realize and transformer neutral point DC current are pressed down
The electric current of device processed, voltage stress test.
The content of the invention
The object of the present invention is to provide a kind of transformer neutral point DC current restraining device to test system, to realize pair
The electric current of transformer neutral point DC current restraining device, voltage stress test.
To achieve the above object, the solution of the present invention includes：
A kind of transformer neutral point DC current restraining device tests system, including DC charging unit, AC charging list
Member, trigger valve Vaux, output and ground；One end of the AC charging unit and DC charging unit passes through trigger valve
Vaux connection output terminals, the output terminal are used to be connected with the high-pressure side of test product device TO；The AC charging unit and direct current
The other end connection ground terminal of charhing unit, the ground terminal are used to after being connected with the ground terminal of test product device TO be grounded；It is described
DC charging unit is made of LC resonance circuit and DC switch-type convertor circuit；The AC charging unit is by LC resonance circuit
Formed with alternating-current switch type convertor circuit.
The AC charging unit includes charging capacitor group C1, reactor L1, trigger valve V1With trigger valve V2；It is described to touch
Send out valve V1With trigger valve V2Reverse parallel connection；The charging capacitor group C1Pass sequentially through reactor L1, the trigger valve of reverse parallel connection
V1With trigger valve V2Connect trigger valve Vaux；Charging capacitor group C1With reactor L1Resonance produces sinusoidal current, trigger valve V1With
Trigger valve V2For controlling boosting and the break-make of alternating current.
The DC charging unit includes charging capacitor group C2, reactor L2, trigger valve V3With turn-off device IGCT
Valve；The charging capacitor group C2Pass sequentially through reactor L2With trigger valve V3Connect trigger valve Vaux；The IGCT valves series connection two
After pole pipe with charging capacitor group C2It is in parallel；The charging capacitor group C2With reactor L2Resonance, and controlled and produced by IGCT valves
Raw DC current.
The trigger valve V1、V2、V3, Vaux and IGCT valves control by same long hair pulse signal.
The beneficial effects of the invention are as follows：Direct current is produced by DC charging unit, exchange is produced by AC charging unit,
And by the compound generation of two-way electric current and the equivalent recombination current of actual condition, and be added on test product device corresponding to be carried out to device
Examination.Realize the electric current to transformer neutral point DC current restraining device, voltage stress test.
Brief description of the drawings
Fig. 1 is the transformer neutral point DC current restraining device figure based on neutral point series-capacitor；
Fig. 2 is the device circuit figure of the embodiment of the present invention 1；
Fig. 3 is the device circuit figure of the embodiment of the present invention 2；
Fig. 4 is the experiment transient-wave figure of the embodiment of the present invention 2.
Embodiment
Embodiment 1
As shown in Figure 1, the transformer neutral point DC current restraining device test system of the present invention includes DC charging list
Member, AC charging unit, trigger valve Vaux, output and ground；One end of AC charging unit and DC charging unit leads to
Trigger valve Vaux connection output terminals are crossed, output terminal is used to be connected with the high-pressure side of test product device TO；AC charging unit and direct current
The other end connection ground terminal of charhing unit, ground terminal are used to after being connected with the ground terminal of test product device TO be grounded；DC charging
Unit is made of LC resonance circuit and DC switch-type convertor circuit；AC charging unit is by LC resonance circuit and alternating-current switch type
Convertor circuit is formed.
In the above-described embodiments, AC charging unit includes charging capacitor group C1, reactor L1, trigger valve V1And triggering
Valve V2；Trigger valve V1With trigger valve V2Reverse parallel connection.Charging capacitor group C1Pass sequentially through reactor L1, the triggering of reverse parallel connection
Valve V1With trigger valve V2Connect trigger valve Vaux.Charging capacitor group C1With reactor L1Resonance produces sinusoidal current, trigger valve V1
With trigger valve V2For controlling boosting and the break-make of alternating current.
In the above-described embodiments, the DC charging unit includes charging capacitor group C2, reactor L2, trigger valve V3With
Turn-off device IGCT valves；The charging capacitor group C2Pass sequentially through reactor L2With trigger valve V3Connect trigger valve Vaux；Institute
State after IGCT valve series diodes with charging capacitor group C2It is in parallel；The charging capacitor group C2With reactor L2Resonance, and lead to
Cross the control of IGCT valves and produce DC current.As other embodiment, the charhing unit is directly constituted by DC source.
In the above-described embodiments, the trigger valve V1、V2、V3, Vaux and IGCT valves are by same long hair pulse signal control
System.
Embodiment 2
As shown in figure 3, the transformer neutral point DC current restraining device test system of the present invention includes DC charging list
Member, AC charging unit, trigger valve Vaux, output and ground；The one of the AC charging unit and DC charging unit
End passes through trigger valve Vaux connection output terminals, and the output terminal is connected with the high-pressure side of test product device TO；The AC charging list
Member connects ground terminal with the other end of DC charging unit, and the ground terminal is grounded after being connected with the ground terminal of test product device TO.
The AC charging unit includes charging capacitor group C1, reactor L1, trigger valve V1With trigger valve V2, trigger valve V1
With trigger valve V2Reverse parallel connection.Charging capacitor group C1Pass sequentially through reactor L1, the trigger valve V that of reverse parallel connection1And trigger valve
V2Connect trigger valve Vaux.Charging capacitor group C1With reactor L1Resonance produces sinusoidal current, trigger valve V1With trigger valve V2With
Boosting and break-make in control alternating current.
The DC charging unit includes charging capacitor group C2, reactor L2, trigger valve V3With turn-off device IGCT
Valve；The charging capacitor group C2Pass sequentially through reactor L2With trigger valve V3Connect trigger valve Vaux；The IGCT valves series connection two
After pole pipe with charging capacitor group C2It is in parallel；The charging capacitor group C2With reactor L2Resonance, and controlled and produced by IGCT valves
Raw DC current.
When testing test product device TO, according to test requirements document, calculate and set charging capacitor group C1With fill
Electric capacitor group C2Charging voltage and charging current.Respectively to charging capacitor group C1With charging capacitor group C2Charge；
As charging capacitor group C1、C2Charging voltage reach setting value after, cut off the power, make charger out of service.Test product is set to fill
It is set to the capacity earth method of operation；Trigger valve V is made by the first start pulse signal1、V2, V3, Vaux and IGCT valve conducting；Electricity
Predetermined alternating current-direct current recombination current is produced in road；Alternating current-direct current recombination current is flowed through in test product device TO, reaches protection act condition
Afterwards, the control strategy action inside device, pilot system is out of service, ground connection, off-test.
During experiment, test system simulates the ac and dc current complex component of different amplitudes.Test product device TO for
The electric current of AC compounent, impedance very little；DC current energy in absorbing circuit.When test product device TO capacitance voltages reach action
During voltage, the IGBT group in bypath system, tests the energy of system and the capacitive energy of test product device TO and is returned through over commutation
Thyristor is flowed through on road, and test product device TO switchs to be grounded the method for operation through small inductor.After some milliseconds, the control of electronics trip gear
High-speed switch closes, and test product device TO switchs to the metallic ground method of operation.Main circuit current, thyristor are measured during experiment
Bypass loop electric current and high-speed switch loop current and test product device TO capacitance both end voltages, as shown in Figure 4.
Claims (3)
1. a kind of transformer neutral point DC current restraining device tests system, it is characterised in that：Including DC charging unit, hand over
Current charge unit, trigger valve Vaux, output and ground；One end of the AC charging unit and DC charging unit passes through
Trigger valve Vaux connection output terminals, the output terminal are used to be connected with the high-pressure side of test product device TO；The AC charging unit
Ground terminal is connected with the other end of DC charging unit, the ground terminal is used to be connected with the ground terminal of test product device TO to be followed by
Ground；The DC charging unit is made of LC resonance circuit and DC switch-type convertor circuit；The AC charging unit is by LC
Resonance circuit and alternating-current switch type convertor circuit are formed；The DC charging unit includes charging capacitor group C2, reactor L2、
Trigger valve V3With turn-off device IGCT valves；The charging capacitor group C2Pass sequentially through reactor L2With trigger valve V3Connection is touched
Send out valve Vaux；After the turn-off device IGCT valve series diodes with charging capacitor group C2It is in parallel；The charging capacitor
Group C2With reactor L2Resonance, and controlled by turn-off device IGCT valves and produce DC current；Trigger valve V3, trigger valve Vaux
Controlled with turn-off device IGCT valves by same long hair pulse signal.
2. transformer neutral point DC current restraining device according to claim 1 tests system, it is characterised in that：It is described
AC charging unit includes charging capacitor group C1, reactor L1, trigger valve V1With trigger valve V2；The trigger valve V1And trigger valve
V2Reverse parallel connection；The charging capacitor group C1Pass sequentially through reactor L1, the trigger valve V that of reverse parallel connection1With trigger valve V2Even
Meet trigger valve Vaux；Charging capacitor group C1With reactor L1Resonance produces sinusoidal current, trigger valve V1With trigger valve V2For controlling
The break-make of alternating current processed.
3. transformer neutral point DC current restraining device according to claim 2 tests system, it is characterised in that：It is described
Trigger valve V1、V2、V3, Vaux and turn-off device IGCT valves control by same long hair pulse signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510389963.XA CN104931840B (en) | 2015-07-02 | 2015-07-02 | A kind of transformer neutral point DC current restraining device tests system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510389963.XA CN104931840B (en) | 2015-07-02 | 2015-07-02 | A kind of transformer neutral point DC current restraining device tests system |
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| CN104931840A CN104931840A (en) | 2015-09-23 |
| CN104931840B true CN104931840B (en) | 2018-05-04 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106532723B (en) * | 2016-09-08 | 2018-12-18 | 华北电力大学 | Idle method of adjustment under series transformer D.C. magnetic biasing in THE UPFC |
| CN106771512B (en) * | 2016-11-15 | 2019-08-09 | 广东电网有限责任公司电力科学研究院 | A kind of direct current current-limiting device installation judgment method and device |
| CN109103861A (en) * | 2018-08-13 | 2018-12-28 | 广州供电局有限公司 | Inhibit the device of AC transformer neutral point direct current and alternating current |
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|---|---|---|---|---|
| CN101236224A (en) * | 2007-12-24 | 2008-08-06 | 国网直流工程建设有限公司 | Converter transformer DC magnetic bias electrical current practical test method |
| CN201199633Y (en) * | 2008-04-17 | 2009-02-25 | 武汉华瑞防雷科技股份有限公司 | Neutral point great current earthing DC insulation control cabinet |
| CN101710697A (en) * | 2009-11-17 | 2010-05-19 | 江苏省电力试验研究院有限公司 | Device and method for inhibiting direct current of neutral point of transformer |
| CN201490692U (en) * | 2009-08-14 | 2010-05-26 | 华东电力试验研究院有限公司 | Direct current magnetic bias restraining device for transformer neutral points |
| CN103033695A (en) * | 2011-09-28 | 2013-04-10 | 特变电工股份有限公司 | Detection method of transformer direct current bias magnetic tolerance ability |
| CN103176069A (en) * | 2011-12-23 | 2013-06-26 | 特变电工沈阳变压器集团有限公司 | Test method for applying DC (Direct Current) magnetic bias current of transformer |
| CN103837827A (en) * | 2014-03-22 | 2014-06-04 | 中国科学院电工研究所 | Fault operation test device of flexible direct current transmission valve |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3750448B2 (en) * | 1999-11-30 | 2006-03-01 | 富士電機システムズ株式会社 | Method and apparatus for detecting direct-current bias in induction iron core |
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2015
- 2015-07-02 CN CN201510389963.XA patent/CN104931840B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101236224A (en) * | 2007-12-24 | 2008-08-06 | 国网直流工程建设有限公司 | Converter transformer DC magnetic bias electrical current practical test method |
| CN201199633Y (en) * | 2008-04-17 | 2009-02-25 | 武汉华瑞防雷科技股份有限公司 | Neutral point great current earthing DC insulation control cabinet |
| CN201490692U (en) * | 2009-08-14 | 2010-05-26 | 华东电力试验研究院有限公司 | Direct current magnetic bias restraining device for transformer neutral points |
| CN101710697A (en) * | 2009-11-17 | 2010-05-19 | 江苏省电力试验研究院有限公司 | Device and method for inhibiting direct current of neutral point of transformer |
| CN103033695A (en) * | 2011-09-28 | 2013-04-10 | 特变电工股份有限公司 | Detection method of transformer direct current bias magnetic tolerance ability |
| CN103176069A (en) * | 2011-12-23 | 2013-06-26 | 特变电工沈阳变压器集团有限公司 | Test method for applying DC (Direct Current) magnetic bias current of transformer |
| CN103837827A (en) * | 2014-03-22 | 2014-06-04 | 中国科学院电工研究所 | Fault operation test device of flexible direct current transmission valve |
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| CN104931840A (en) | 2015-09-23 |
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