CN104810793B - A kind of transformer neutral point direct current blocking device - Google Patents
A kind of transformer neutral point direct current blocking device Download PDFInfo
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- CN104810793B CN104810793B CN201510194325.2A CN201510194325A CN104810793B CN 104810793 B CN104810793 B CN 104810793B CN 201510194325 A CN201510194325 A CN 201510194325A CN 104810793 B CN104810793 B CN 104810793B
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- 230000007935 neutral effect Effects 0.000 title claims abstract description 32
- 230000000903 blocking effect Effects 0.000 title claims abstract description 28
- 239000003990 capacitor Substances 0.000 claims abstract description 47
- 239000013307 optical fiber Substances 0.000 claims description 6
- 230000015556 catabolic process Effects 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 description 4
- 230000005611 electricity Effects 0.000 description 4
- 230000001960 triggered effect Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000000452 restraining effect Effects 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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- 230000007774 longterm Effects 0.000 description 1
- 230000005404 monopole Effects 0.000 description 1
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Abstract
The present invention relates to a kind of transformer neutral point direct current blocking device, including：Block capacitor, normal open switch, rectifier bridge, block capacitor is connected between the neutral point of transformer and ground, normal open switch is in parallel with block capacitor, the both ends of the input connection block capacitor of rectifier bridge, the output end of rectifier bridge is serially connected with trigger module and current-limiting reactor, blocking device also includes being used for the current transformer for triggering normal open switch closure, and the current transformer is connected on the circuit between block capacitor and the input of rectifier bridge.Because the current transformer is serially connected in AC, the electric current moment of AC is changing, so current transformer collects current signal, reliability increase at any time.Moreover, controlling normal open switch to close by the signal of collection, the reliability of device is improved.
Description
Technical field
The present invention relates to a kind of transformer neutral point direct current blocking device, belong to high voltage power transmission technical field.
Background technology
In recent years, as the development of extra-high voltage direct-current transmission technology, put into operation circuit of the extra-high voltage direct-current transmission in China are got over
Come more.When DC power transmission line is run in monopole the earth, because the earthing pole in straight-flow system is not preferable earthing pole, connect
Earth polar causes the DC current part in system to pass through change using the neutral point of AC system transformer as loop with the presence of resistance
The neutral point of depressor flows into AC system.After DC current enters AC transformer, cause transformer to produce D.C. magnetic biasing and draw
Transformer magnetic saturation is played, so as to cause the exciting current of transformer to raise, transformer noise aggravation, serious causes transformer event
Barrier.The DC magnetic bias current of power transformer neutral point has had a strong impact on the safety of power network.
Application No. 201310691362.5, the China of entitled " transformer neutral point DC current restraining device "
Patent application, a kind of transformer neutral point DC current restraining device is disclosed, is included：Partiting dc capacitor, it is connected to transformation
Between the neutral point and ground of device；Fast combination switch, fast combination switch are in parallel with partiting dc capacitor；Rectifier bridge, input and stopping direct current electricity
The both ends connection of appearance, direct voltage output is converted into trigger module by the alternating voltage of transformer neutral point；Trigger module, it is defeated
Go out the tripping coil that end connects fast combination switch, trigger module detects the magnitude of voltage of rectifier bridge output in real time, when detecting overvoltage
When, triggering and conducting, obtain tripping coil electric, then the normally opened contact rapid closing of fast combination switch, now partiting dc capacitor is closed by speed
Switch short, transformer neutral point are grounded by fast combination switch, automatically exit from partiting dc capacitor.
This application can avoid direct current from flowing into AC transformer, both protect transformer neutral point, and protection device is in itself
Electric capacity.But due to only obtaining the closure trigger signal of fast combination switch in DC side, and DC side is obtained than AC and triggered
The difficulty of signal is big, so, in this application, the reliability for obtaining signal is very low.
The content of the invention
It is an object of the invention to provide a kind of transformer neutral point direct current blocking device, to solve in the prior art straight
The problem of closure trigger signal that stream side gathers fast combination switch causes reliability very low.
To achieve the above object, the solution of the present invention includes a kind of transformer neutral point direct current blocking device, including：Blocking
Capacitor, normal open switch, rectifier bridge, block capacitor are connected between the neutral point of transformer and ground, normal open switch and blocking
Capacitor is in parallel, the both ends of the input connection block capacitor of rectifier bridge, the output end of rectifier bridge be serially connected with trigger module and
Current-limiting reactor, the blocking device also include a current transformer for being used to trigger the normal open switch closure, the electricity
Current transformer is connected on the circuit between the input of the block capacitor and rectifier bridge.
The blocking device also includes a redundancy coil for being used to provide triggering closure signal for the normal open switch, institute
State the output end that redundancy coil is connected to rectifier bridge.
The current transformer include be used for connect a rectifier input secondary coil, the rectifier it is defeated
Go out end and concatenate the control coil of the normal open switch and a normally closed auxiliary contact of the control coil.
The trigger module includes two IGCTs being arranged in parallel in the same direction and the triggering control for triggering turn on thyristors
Device processed, the IGCT are connected with the current-limiting reactor, and the trigger controller includes BOD and for according to block capacitor
Terminal voltage judge the optical fiber trigger module of turn on thyristors, the output end of one end connection rectifier bridge of the BOD, the other end connects
Connect the gate pole of IGCT.
The blocking device also includes a disconnecting switch for being used for blocking device described in switching, the block capacitor
One end connects the neutral point of transformer, other end ground connection by the disconnecting switch.
The invention has the advantages that a use is connected on circuit between block capacitor and the input of rectifier bridge
In the current transformer of triggering normal open switch closure, because the current transformer is serially connected in AC, the electric current moment of AC
Changing, so current transformer collects current signal at any time, in addition, effectively being controlled according to the signal of collection normally opened
Switch closure, ensures that normal open switch has two kinds of closed control loops, the reliability and security of device has been significantly greatly increased.
Brief description of the drawings
Fig. 1 is the structural representation of one embodiment of the present invention；
Fig. 2 is the circuit diagram of the control loop of high-speed switch；
Fig. 3 is the triggering control principle drawing of electronic switch；
Fig. 4 is the structural representation of another embodiment of the invention.
Embodiment
The present invention will be further described in detail below in conjunction with the accompanying drawings.
A kind of transformer neutral point direct current blocking device, including：Block capacitor, normal open switch, rectifier bridge, capacitance
Device is connected between the neutral point of transformer and ground, and normal open switch is in parallel with block capacitor, the connection of the input of rectifier bridge every
The both ends of straight capacitor, the output end of rectifier bridge are serially connected with trigger module and current-limiting reactor, and the blocking device also includes one
For triggering the current transformer of normal open switch closure, current transformer be connected to block capacitor and rectifier bridge input it
Between circuit on.
Based on above basic technical scheme, with reference to accompanying drawing, provide with next embodiment.
As shown in figure 1, the transformer neutral point direct current blocking device includes：Block capacitor C1, for protecting blocking electric
Container C1 quick-make switch KM1, rectifier bridge (D1-D4), block capacitor C1 are connected to the neutral point and ground of transformer
Between, quick-make switch KM1 is in parallel with block capacitor C1, the input connection block capacitor C1 of rectifier bridge both ends, whole
The output end of stream bridge is serially connected with trigger module and current-limiting reactor L2.
The blocking device also includes being used for the Current Transmit 1 for triggering quick-make switch KM1, Current Transmit 1
It is serially connected on the circuit between block capacitor C1 and the input of rectifier bridge, i.e., in AC power taking.
The current coil L3 whether a controlling switch KM1 turn on, the current coil are connected with the output end of rectifier bridge
For providing triggering closure signal for quick-make switch KM1, as an embodiment, current-limiting reactor L2 and coil L3 goes here and there
Connection, for providing triggering closure signal for quick-make switch KM1.Current Transmit 1 is set with current coil L3 redundancies.
Under normal circumstances, block capacitor C1 is connected in transformer neutral point all the time, utilizes the logical exchange blocking of capacitor
The characteristics of stream, the DC current of isolating transformer.
As shown in Fig. 2 the secondary side connection rectifier ZLQ of Current Transmit 1 input, rectifier ZLQ output
The end concatenation quick-make switch KM1 control coil DF and normally closed auxiliary contact DF of the control coil.In order to limit rectifier
Voltage magnitude after ZLQ rectifications output, to protect overvoltage of the quick-make switch KM1 closing coil not after by rectification to damage
It is bad, can be in one arrester FV of the both ends of closing coil parallel connection.
As shown in figure 3, above-mentioned trigger module includes touching for two IGCTs (T1, T2) being arranged in parallel in the same direction and IGCT
Send out control loop.Two IGCTs while the conducting that is triggered, double-thyristor is standby each other first can improve reliability, in addition,
The two IGCT turned in parallel, the through-current capability in IGCT loop is improved, higher fault current can be born.IGCT
Connected with current-limiting reactor L2, triggering control loop includes two parts, and one is breakdown diode BOD, and BOD one end connection is whole
The output end of bridge is flowed, the other end connects the gate pole of two IGCTs by diode D11 simultaneously；Trigger another portion of control loop
It is an optical fiber trigger module to divide, and is specially made up of the triggering 1 of control device control, triggering 2, when control device detects electricity
When container terminal voltage exceedes setting value, by optical fiber, by triggering 1 and triggering 2, two trigger signals of output, two signals are jointly
Redundancy Design, trigger signal is after processing by triggering turn on thyristors after diode D12.Optical fiber trigger module and BOD redundancies
Set.Wherein BOD is standby triggering, when control device or the trigger circuit failure formed by the optical fiber trigger module, by crystalline substance
Brake tube overvoltage BOD is as standby trigger circuit forced-triggered IGCT.
Convenient with switching in order to overhaul, block capacitor C1 is in parallel with circuit breaker Q F1, and in block capacitor C1 and transformation
Disconnecting switch QF2 is concatenated on circuit between the neutral point of device.When carrying out system overhaul, by disconnecting QF1 and/or QF2, reach
To the purpose of safety inspection.
Under normal circumstances, block capacitor C1 is connected in transformer neutral point all the time, utilizes the logical exchange blocking of capacitor
The characteristics of stream, the DC current of isolating transformer.Work as transformer fault, the terminal voltage on capacitor exceedes the setting value allowed
When, IGCT (T1, T2) is turned on automatically due to trigger signal, by current-limiting reactor L2 shorted capacitor C1, so as to limit
Capacitor C1 terminal voltage, avoid block capacitor C1 excessive pressure damages.Quick-make switch KM1 can be given by current coil L3
One triggering closure signal, closes KM1；Meanwhile the electric current in current-limiting reactor L2 loops passes through Large Copacity current transformer
CT1 is sampled, and by rectifier ZLQ rectifications after, closing coil DF obtains electric, direct drive quick-make switch KM1 closing line
Circle closes KM1.Capacitor C1 is switched on and off KM1 short circuits, and transformer neutral point is directly grounded by quick-make switch KM1, is protected
The IGCT (T1, T2) and rectifier bridge in shield current-limiting reactor loop avoid long-term overcurrent damage.After high-speed switch KM1 closures,
By capacitor C1 short circuits, meanwhile, normally-closed contact DF disconnects automatically, and closing coil dead electricity, high-speed switch KM1 is returned to the shape of disconnection
State.The signal redundancy of above-mentioned two driving KM1 closures is set, as long as having a signal with regard to that can trigger KM1 closures.KM1 combined floodgate
Do not influenceed by external power source, its combined floodgate energy is from the electric current collected.
When at block capacitor C1 both ends overvoltage occurs for the present apparatus, device remains able to automatically exit from capacitor C1, rises
To protection electronic device and rectifier bridge and the effect for preventing transformer neutral point overvoltage.
In above-mentioned embodiment, Current Transmit 1 and current coil L3 redundancies are set, and control normal open switch KM1's closes
Close, as other embodiments, as shown in figure 4, only one Current Transmit of setting can also realize the control of normal open switch
System.
Specific embodiment is presented above, but the present invention is not limited to described embodiment.The base of the present invention
This thinking is above-mentioned basic scheme, for those of ordinary skill in the art, according to the teachings of the present invention, designs various changes
The model of shape, formula, parameter simultaneously need not spend creative work.It is right without departing from the principles and spirit of the present invention
The change, modification, replacement and modification that embodiment is carried out are still fallen within protection scope of the present invention.
Claims (3)
1. a kind of transformer neutral point direct current blocking device, including：Block capacitor, normal open switch, rectifier bridge, block capacitor
Be connected between the neutral point of transformer and ground, normal open switch is in parallel with block capacitor, the connection of two inputs of rectifier bridge every
The both ends of straight capacitor, the output end of rectifier bridge are serially connected with trigger module and current-limiting reactor, it is characterised in that the blocking dress
Putting also includes a current transformer for being used to trigger the normal open switch closure, and the current transformer is connected to the blocking
On circuit between capacitor and the input of rectifier bridge；
The blocking device also includes a redundancy coil for being used to provide triggering closure signal for the normal open switch, described superfluous
Remaining coil is connected to the output end of rectifier bridge；
The current transformer includes the secondary coil for being used to connect the input of a rectifier, the output end of the rectifier
Concatenate the control coil of the normal open switch and a normally closed auxiliary contact of the control coil；The combined floodgate of the normal open switch
The both ends of a coil arrester in parallel.
2. transformer neutral point direct current blocking device according to claim 1, it is characterised in that the trigger module includes
Two IGCTs being arranged in parallel in the same direction and the trigger controller for triggering turn on thyristors, the IGCT and the current limliting
Reactor is connected, and the trigger controller includes breakdown diode BOD and for judging crystalline substance according to the terminal voltage of block capacitor
The optical fiber trigger module of brake tube conducting, the output end of one end connection rectifier bridge of the breakdown diode BOD, other end connection are brilliant
The gate pole of brake tube.
3. transformer neutral point direct current blocking device according to claim 2, it is characterised in that the blocking device also wraps
A disconnecting switch for being used for blocking device described in switching is included, one end of the block capacitor is connected by the disconnecting switch
The neutral point of transformer, other end ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510194325.2A CN104810793B (en) | 2015-04-23 | 2015-04-23 | A kind of transformer neutral point direct current blocking device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510194325.2A CN104810793B (en) | 2015-04-23 | 2015-04-23 | A kind of transformer neutral point direct current blocking device |
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| Publication Number | Publication Date |
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| CN104810793A CN104810793A (en) | 2015-07-29 |
| CN104810793B true CN104810793B (en) | 2018-03-02 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106711945B (en) * | 2016-10-19 | 2018-10-19 | 许继集团有限公司 | A kind of blocking device and diagnostic method of tape jam diagnostic function |
| CN107064850B (en) * | 2017-04-11 | 2019-08-06 | 许继电气股份有限公司 | A kind of transformer blocking control device and data acquisition unit error calibration method |
| CN107834391A (en) * | 2017-11-07 | 2018-03-23 | 广州粤能电力科技开发有限公司 | Transformer capacitor blocking device |
| CN111446709A (en) * | 2019-01-17 | 2020-07-24 | 国网新疆电力有限公司电力科学研究院 | Resistance-type electric wire netting GIC administers device |
| CN111431151B (en) * | 2020-04-10 | 2022-05-06 | 南方电网科学研究院有限责任公司 | Transformer-shaped neutral point grounding device and method for blocking direct secondary side short circuit |
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| CN103683194A (en) * | 2013-12-17 | 2014-03-26 | 国家电网公司 | Transformer neutral point direct current suppression device |
| CN203631282U (en) * | 2013-12-19 | 2014-06-04 | 国家电网公司 | DC magnetic bias online monitoring and separating device of power transformer |
| CN204597457U (en) * | 2015-04-23 | 2015-08-26 | 许继集团有限公司 | Transformer neutral point direct current is every straight device |
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2015
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|---|---|---|---|---|
| US5734256A (en) * | 1995-05-31 | 1998-03-31 | General Electric Company | Apparatus for protection of power-electronics in series compensating systems |
| CN201946970U (en) * | 2011-01-11 | 2011-08-24 | 广州高澜节能技术有限公司 | High-voltage transformer neutral point direct current isolating device |
| CN201985516U (en) * | 2011-01-28 | 2011-09-21 | 广州高澜节能技术股份有限公司 | Isolation device for restraining high-tension transformer neutral point direct current by serial capacitance |
| CN103683194A (en) * | 2013-12-17 | 2014-03-26 | 国家电网公司 | Transformer neutral point direct current suppression device |
| CN203631282U (en) * | 2013-12-19 | 2014-06-04 | 国家电网公司 | DC magnetic bias online monitoring and separating device of power transformer |
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