CN204597457U - Transformer neutral point direct current is every straight device - Google Patents
Transformer neutral point direct current is every straight device Download PDFInfo
- Publication number
- CN204597457U CN204597457U CN201520247286.3U CN201520247286U CN204597457U CN 204597457 U CN204597457 U CN 204597457U CN 201520247286 U CN201520247286 U CN 201520247286U CN 204597457 U CN204597457 U CN 204597457U
- Authority
- CN
- China
- Prior art keywords
- transformer
- neutral point
- block capacitor
- rectifier bridge
- straight device
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000007935 neutral effect Effects 0.000 title claims abstract description 34
- 239000003990 capacitor Substances 0.000 claims abstract description 50
- 239000013307 optical fiber Substances 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000000452 restraining effect Effects 0.000 description 2
- 230000001960 triggered effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
Landscapes
- Rectifiers (AREA)
Abstract
The utility model relates to a kind of transformer neutral point direct current every straight device, comprise: 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 input of rectifier bridge connects the two ends of block capacitor, the output of rectifier bridge is serially connected with trigger module and current limiting reactor, also comprise for triggering the closed current transformer of normal open switch every straight device, this current transformer is connected on the circuit between block capacitor and the input of rectifier bridge.Because this current transformer is serially connected in AC, be engraved in change during the electric current of AC, so current transformer collects current signal at any time, reliability increases.And, closed by the signal controlling normal open switch gathered, improve the reliability of device.
Description
Technical field
The utility model relates to a kind of transformer neutral point direct current every straight device, belongs to high voltage power transmission technical field.
Background technology
In recent years, along with the development of extra-high voltage direct-current transmission technology, extra-high voltage direct-current transmission gets more and more at the circuit that puts into operation of China.When DC power transmission line is run at one pole the earth, because the earth electrode in direct current system is not desirable earth electrode, earth electrode has resistance to exist, and causes direct current part in system with the neutral point of AC system transformer for loop, flows into AC system by the neutral point of transformer.After direct current enters AC transformer, cause transformer produce D.C. magnetic biasing and cause transformer magnetic saturation, thus cause the exciting current of transformer to raise, transformer noise aggravates, and serious causes transformer fault.The DC magnetic bias current of power transformer neutral point has had a strong impact on the safety of electrical network.
Application number is 201310691362.5, denomination of invention is the Chinese patent application of " transformer neutral point DC current restraining device ", disclose a kind of transformer neutral point DC current restraining device, include: partiting dc capacitor, be connected between the neutral point of transformer and ground; Speed combination switch, fast combination switch is in parallel with partiting dc capacitor; Rectifier bridge, input is connected with the two ends of partiting dc capacitor, converts the alternating voltage of transformer neutral point to direct voltage output to trigger module; Trigger module, output connects the tripping coil of fast combination switch, trigger module detects the magnitude of voltage that rectifier bridge exports in real time, when overvoltage being detected, triggering and conducting, makes tripping coil obtain electric, the then normally opened contact rapid closing of fast combination switch, now partiting dc capacitor is by fast combination switch short circuit, and transformer neutral point, by fast combination switch ground connection, exits partiting dc capacitor automatically.
This application can avoid direct current to flow into AC transformer, both protects transformer neutral point, again the electric capacity of protective device itself.But owing to only obtaining the closed triggering signal of fast combination switch in DC side, and the difficulty that DC side obtains triggering signal than AC is large, so in this application, the reliability obtaining signal is very low.
Utility model content
The purpose of this utility model is to provide a kind of transformer neutral point direct current every straight device, causes the problem that reliability is very low in order to solve in prior art in the closed triggering signal of DC side collection speed combination switch.
For achieving the above object, scheme of the present utility model comprises a kind of transformer neutral point direct current every straight device, comprise: 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 input of rectifier bridge connects the two ends of block capacitor, the output of rectifier bridge is serially connected with trigger module and current limiting reactor, describedly also comprise one for triggering the closed current transformer of described normal open switch every straight device, described current transformer is connected on the circuit between described block capacitor and the input of rectifier bridge.
Describedly also comprise one every straight device and trigger the redundancy coil of closure signal for providing for described normal open switch, described redundancy coil is connected to the output of rectifier bridge.
Described current transformer comprises the secondary coil of the input for connecting a rectifier, and the output of described rectifier is connected in series the control coil of described normal open switch and a normally closed auxiliary contact of described control coil.
Described trigger module comprises two thyristors and the trigger controller for triggering turn on thyristors that are arranged in parallel in the same way, described thyristor is connected with described current limiting reactor, described trigger controller comprises BOD and the optical fiber trigger module for judging turn on thyristors according to the terminal voltage of block capacitor, one end of described BOD connects the output of rectifier bridge, and the other end connects the gate pole of thyristor.
Described every straight device also comprise one for described in switching every the isolating switch of straight device, one end of described block capacitor by the neutral point of described isolating switch connection transformer, other end ground connection.
The beneficial effects of the utility model are, circuit between block capacitor and the input of rectifier bridge is connected one for triggering the closed current transformer of normal open switch, because this current transformer is serially connected in AC, change is engraved in during the electric current of AC, so current transformer collects current signal at any time, in addition, effectively control normal open switch according to the signal gathered to close, ensure that normal open switch has two kinds of closed control loops, greatly add reliability and the fail safe of device.
Accompanying drawing explanation
Fig. 1 is the structural representation of the utility model execution mode;
Fig. 2 is the circuit diagram of the control loop of high-speed switch;
Fig. 3 is the trigging control schematic diagram of electronic switch;
Fig. 4 is the structural representation of another execution mode of the utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in more detail.
A kind of transformer neutral point direct current is every straight device, comprise: 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 input of rectifier bridge connects the two ends of block capacitor, the output of rectifier bridge is serially connected with trigger module and current limiting reactor, should also comprise one for triggering the closed current transformer of normal open switch every straight device, current transformer is connected on the circuit between block capacitor and the input of rectifier bridge.
Based on above basic technical scheme, by reference to the accompanying drawings, provide with next embodiment.
As shown in Figure 1; this transformer neutral point direct current comprises every straight device: block capacitor C1, the quick-make switch KM1 for the protection of block capacitor C1, rectifier bridge (D1-D4); block capacitor C1 is connected between the neutral point of transformer and ground; quick-make switch KM1 is in parallel with block capacitor C1; the input of rectifier bridge connects the two ends of block capacitor C1, and the output of rectifier bridge is serially connected with trigger module and current limiting reactor L2.
This also comprises the Current Transmit 1 for triggering quick-make switch KM1 every straight device, and Current Transmit 1 is serially connected on the circuit between block capacitor C1 and the input of rectifier bridge, namely in AC power taking.
Control switch KM1 conducting whether current coil L3 is connected with at the output of rectifier bridge, this current coil is used for providing triggering closure signal for quick-make switch KM1, as an execution mode, current limiting reactor L2 connects with coil L3, for providing triggering closure signal for quick-make switch KM1.Current Transmit 1 and current coil L3 redundancy are arranged.
Under normal circumstances, block capacitor C1 is connected in transformer neutral point all the time, utilizes capacitor to lead to the feature exchanging stopping direct current, the direct current of isolating transformer.
As shown in Figure 2, the secondary side of Current Transmit 1 connects the input of rectifier ZLQ, the control coil DF of output serial connection quick-make switch KM1 of rectifier ZLQ and the normally closed auxiliary contact DF of this control coil.In order to limit the voltage magnitude after rectifier ZLQ rectification output, to protect the closing coil of quick-make switch KM1 not damage by the overvoltage after rectification, can at the two ends of a closing coil parallel connection lightning arrester FV.
As shown in Figure 3, above-mentioned trigger module comprises the trigging control loop of two thyristors (T1, T2) and the thyristor be arranged in parallel in the same way.Two thyristors are triggered conducting simultaneously, and first double-thyristor is for subsequent use each other can improve reliability, and in addition, these two thyristor turned in parallel, improve the through-current capability in thyristor loop, can bear higher fault current.Thyristor is connected with current limiting reactor L2, and trigging control loop comprises two parts, and one is that one end of breakdown diode BOD, BOD connects the output of rectifier bridge, and the other end connects the gate pole of two thyristors by diode D11 simultaneously; The another part in trigging control loop is an optical fiber trigger module, be specially controlled by control device triggering 1, trigger and 2 to form, when control device detects that capacitor terminal voltage exceedes set point, by optical fiber by triggering 1 and triggering 2 output two triggering signals jointly, two signals are Redundancy Design, and triggering signal is after treatment by triggering turn on thyristors after diode D12.Optical fiber trigger module and BOD redundancy are arranged.Wherein BOD be standby trigger, when control device or formed by this optical fiber trigger module triggering loop fault time, trigger loop forced-triggered thyristor in support by thyristor overvoltage BOD.
In order to overhaul and switching convenient, block capacitor C1 is in parallel with circuit breaker Q F1, and circuit between block capacitor C1 and the neutral point of transformer is connected in series isolating switch QF2.When carrying out system overhaul, by disconnecting QF1 and/or QF2, reach the object of safety inspection.
Under normal circumstances, block capacitor C1 is connected in transformer neutral point all the time, utilizes capacitor to lead to the feature exchanging stopping direct current, the direct current of isolating transformer.Work as transformer fault, when terminal voltage on capacitor exceedes the set point of permission, thyristor (T1, T2) is automatic conducting due to triggering signal, by current limiting reactor L2 shorted capacitor C1, thus the terminal voltage of limiting capacitance device C1, avoid block capacitor C1 excessive pressure damages.Trigger closure signal can to quick-make switch KM1 mono-by current coil L3, KM1 is closed; Meanwhile, the electric current in current limiting reactor L2 loop is sampled by Large Copacity Current Transmit 1, and by after rectifier ZLQ rectification, closing coil DF obtains electric, and the closing coil of Direct driver quick-make switch KM1 makes KM1 close.Capacitor C1 is by K switch M1 short circuit, and transformer neutral point is by the direct ground connection of quick-make switch KM1, and thyristor (T1, T2) and the rectifier bridge in protection current limiting reactor loop avoid long-term overcurrent damage.After high-speed switch KM1 is closed, by capacitor C1 short circuit, meanwhile, normally-closed contact DF disconnects automatically, closing coil dead electricity, and high-speed switch KM1 gets back to again the state of disconnection.Above-mentioned two drive the signal redundancy that KM1 is closed to arrange, close as long as there is a signal just can trigger KM1.The combined floodgate of KM1 is not by the impact of external power source, and its combined floodgate energy is from the electric current collected.
When overvoltage occurs at block capacitor C1 two ends this device, device still can exit capacitor C1 automatically, plays protection electronic device and rectifier bridge and prevents the superpotential effect of transformer neutral point.
In above-mentioned execution mode, Current Transmit 1 and current coil L3 redundancy are arranged, and control the closed of normal open switch KM1, as other execution mode, as shown in Figure 4, only arrange the control that a Current Transmit also can realize normal open switch.
Be presented above concrete execution mode, but the utility model is not limited to described execution mode.Basic ideas of the present utility model are above-mentioned basic scheme, and for those of ordinary skill in the art, according to instruction of the present utility model, designing the model of various distortion, formula, parameter does not need to spend creative work.The change carried out execution mode when not departing from principle of the present utility model and spirit, amendment, replacement and modification still fall in protection range of the present utility model.
Claims (5)
1. a transformer neutral point direct current is every straight device, comprise: 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 input of rectifier bridge connects the two ends of block capacitor, the output of rectifier bridge is serially connected with trigger module and current limiting reactor, it is characterized in that, describedly also comprise one for triggering the closed current transformer of described normal open switch every straight device, described current transformer is connected on the circuit between described block capacitor and the input of rectifier bridge.
2. transformer neutral point direct current according to claim 1 is every straight device, it is characterized in that, describedly also comprises one every straight device and triggers the redundancy coil of closure signal for providing for described normal open switch, and described redundancy coil is connected to the output of rectifier bridge.
3. transformer neutral point direct current according to claim 2 is every straight device, it is characterized in that, described current transformer comprises the secondary coil of the input for connecting a rectifier, and the output of described rectifier is connected in series the control coil of described normal open switch and a normally closed auxiliary contact of described control coil.
4. transformer neutral point direct current according to claim 3 is every straight device, it is characterized in that, described trigger module comprises two thyristors and the trigger controller for triggering turn on thyristors that are arranged in parallel in the same way, described thyristor is connected with described current limiting reactor, described trigger controller comprises BOD and the optical fiber trigger module for judging turn on thyristors according to the terminal voltage of block capacitor, one end of described BOD connects the output of rectifier bridge, and the other end connects the gate pole of thyristor.
5. transformer neutral point direct current according to claim 4 is every straight device, it is characterized in that, described every straight device also comprise one for described in switching every the isolating switch of straight device, one end of described block capacitor by the neutral point of described isolating switch connection transformer, other end ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520247286.3U CN204597457U (en) | 2015-04-23 | 2015-04-23 | Transformer neutral point direct current is every straight device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520247286.3U CN204597457U (en) | 2015-04-23 | 2015-04-23 | Transformer neutral point direct current is every straight device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204597457U true CN204597457U (en) | 2015-08-26 |
Family
ID=53933571
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520247286.3U Active CN204597457U (en) | 2015-04-23 | 2015-04-23 | Transformer neutral point direct current is every straight device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204597457U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104810793A (en) * | 2015-04-23 | 2015-07-29 | 许继集团有限公司 | Transformer neutral point direct current blocking device |
| CN105490259A (en) * | 2016-01-20 | 2016-04-13 | 桂林电力电容器有限责任公司 | Transformer neutral point capacitive DC blocking device |
| CN105655998A (en) * | 2016-03-31 | 2016-06-08 | 国网天津市电力公司 | Low-voltage side neutral point FACTS (flexible alternating current transmission systems) grounding device of 110kV transformer |
-
2015
- 2015-04-23 CN CN201520247286.3U patent/CN204597457U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104810793A (en) * | 2015-04-23 | 2015-07-29 | 许继集团有限公司 | Transformer neutral point direct current blocking device |
| CN104810793B (en) * | 2015-04-23 | 2018-03-02 | 许继集团有限公司 | A kind of transformer neutral point direct current blocking device |
| CN105490259A (en) * | 2016-01-20 | 2016-04-13 | 桂林电力电容器有限责任公司 | Transformer neutral point capacitive DC blocking device |
| CN105655998A (en) * | 2016-03-31 | 2016-06-08 | 国网天津市电力公司 | Low-voltage side neutral point FACTS (flexible alternating current transmission systems) grounding device of 110kV transformer |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107093890B (en) | A kind of flexible direct current converter station internal fault switchgear distribution and sweep-out method | |
| CN105470911B (en) | A kind of direct current limiter | |
| CN104810793A (en) | Transformer neutral point direct current blocking device | |
| CN102623947B (en) | A kind of earth leakage protective device with phase line handoff functionality | |
| CN103199505B (en) | Output short-circuit protection circuit for high tension battery | |
| CN103138171B (en) | A kind of power electronic transformer substation | |
| CN101741076B (en) | YBCO high-temperature superconducting strip-based short circuit fault current limiter | |
| CN204597457U (en) | Transformer neutral point direct current is every straight device | |
| CN204967236U (en) | Leakage protector | |
| CN103166176B (en) | Under-voltage protection tripper for low-voltage circuit breaker | |
| CN102005749A (en) | Current limiting device with flexible switch characteristic and current limiting method | |
| CN202663104U (en) | Short-circuit current limit device | |
| CN204741270U (en) | Transformer neutral point direct current isolating device | |
| CN203774759U (en) | Direct current inhibition apparatus of transformer neutral point | |
| CN201584755U (en) | Current switching-on device for neutral point direct-current blocking equipment of transformer | |
| US10218170B2 (en) | Current-limiting device utilizing a superconductor for a current-limiting operation | |
| CN103825261A (en) | Circuit control system for suppressing short-circuit fault of circuit | |
| CN202503263U (en) | Leakage protector having phase line switching function | |
| CN116581720A (en) | Thyristor type direct current breaker and control method thereof | |
| CN102664393B (en) | Short circuit current current-limiting apparatus | |
| CN113130235B (en) | Intelligent load switch for electric energy meter, control method thereof and fault diagnosis method | |
| CN201584906U (en) | Thyristor trigger circuit for neutral point direct-current blocking device of transformer | |
| CN211127104U (en) | Circuit breaker | |
| CN204992525U (en) | Undervoltage protection circuit of delaying of switch electrical apparatus | |
| CN202840464U (en) | High-voltage reactive on-site compensation apparatus |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |