CN203774759U - Direct current inhibition apparatus of transformer neutral point - Google Patents
Direct current inhibition apparatus of transformer neutral point Download PDFInfo
- Publication number
- CN203774759U CN203774759U CN201320831764.6U CN201320831764U CN203774759U CN 203774759 U CN203774759 U CN 203774759U CN 201320831764 U CN201320831764 U CN 201320831764U CN 203774759 U CN203774759 U CN 203774759U
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- Prior art keywords
- neutral point
- transformer neutral
- combination switch
- capacitor
- direct current
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- 230000007935 neutral effect Effects 0.000 title claims abstract description 44
- 230000005764 inhibitory process Effects 0.000 title abstract 5
- 239000003990 capacitor Substances 0.000 claims abstract description 40
- 230000000452 restraining effect Effects 0.000 claims description 10
- 238000004146 energy storage Methods 0.000 claims description 4
- 230000000903 blocking effect Effects 0.000 abstract 5
- 230000005540 biological transmission Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 230000005611 electricity Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000009466 transformation Effects 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
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- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
Abstract
The utility model discloses a direct current inhibition apparatus of a transformer neutral point. The direct current inhibition apparatus comprises: a direct current blocking capacitor connected between the transformer neutral point and the ground; a fast-closing switch, connected in parallel with the direct current blocking capacitor; a rectifier bridge, wherein an input end of the rectifier bridge is connected with two ends of the direct current blocking capacitor, and an AC voltage of the transformer neutral point is transformed to a DC voltage and outputted to a trigger module; the trigger module, wherein an output end of the trigger module is connected with a trip coil of the fast-closing switch. The trigger module detects the value of the voltage outputted by the rectifier bridge in real time, when an overvoltage is detected, the trip coil obtains power through triggering, then a normally open contact of the fast-closing switch fast closes. And then the direct current blocking capacitor is short circuited by the fast-closing switch. The transformer neutral point is in ground connection through the fast-closing switch and automatically quits the direct current blocking capacitor. The direct current inhibition apparatus of the utility model can prevent the direct current from flowing into the AC transformer, so as to not only protect the transformer neutral point, but also protect the capacitor of the apparatus. The direct current inhibition apparatus enhances the reliability of the apparatus, and prevents an accident of an electrical network from being further enlarged.
Description
Technical field
The utility model relates to power system voltage automatic control technology field, relates in particular to a kind of transformer neutral point DC current restraining device, plays capacitor for voltage protection and prevents the superpotential device of transformer neutral point.
Background technology
At present, along with the development of extra-high voltage direct-current transmission technology, the extra-high voltage direct-current transmission circuit that puts into operation is more and more, and extra-high voltage direct-current transmission is more and more obvious on the impact of AC system.One of them major effect is that the earth can be served as an electric current return loop in the time of the operation of DC power transmission line one pole the earth or two-phase unbalanced operation, and now direct current is understood some inflow of the AC transformer by neutral ground AC system.Direct current flows into after AC transformer, and transformer can produce DC magnetic bias phenomena, affects the safe and stable operation of transformer.
Near power plant DC power transmission line earth electrode, the impact that transformer station has all been subject to D.C. magnetic biasing to some extent in recent years.
Utility model content
The purpose of this utility model is to provide a kind of transformer neutral point DC current restraining device; in can the complete dead electricity situation of implement device; while there is overvoltage in capacitor two ends; device still can exit capacitor automatically; play capacitor for voltage protection and prevent the superpotential effect of transformer neutral point, solved reliably the problem of transformer DC magnetic bias.
The utility model adopts following technical proposals: a kind of transformer neutral point DC current restraining device, includes:
Partiting dc capacitor, is connected between the neutral point and ground of transformer;
Speed combination switch, fast combination switch is in parallel with partiting dc capacitor, when described fast combination switch is opened, fast combination switch is carried out to spring energy-storage, is the quick-make savings ability of fast combination switch, and now transformer neutral point is by partiting dc capacitor ground connection;
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 of rectifier bridge output in real time, in the time overvoltage being detected, triggering and conducting, obtains tripping coil electric, the normally opened contact rapid closing of fast combination switch, now partiting dc capacitor is by fast combination switch short circuit, and transformer neutral point is by fast combination switch ground connection, and transformer neutral point exits partiting dc capacitor automatically.
Also include protection gap, protection gap is in parallel with partiting dc capacitor.
The puncture voltage in described protection gap is adjusted at 2000V.
Described trigger module includes overvoltage trigger element and thyristor, the signal input part of overvoltage trigger element connects the first output of rectifier bridge, the signal output part of overvoltage trigger element connects the gate pole of thyristor, the first output of the anodic bonding rectifier bridge of thyristor, negative electrode connects the tripping coil of fast combination switch, and the tripping coil other end connects the second output of rectifier bridge.
Described thyristor is two thyristors, two thyristor parallel connections.
The utility model is at the two ends of partiting dc capacitor fast combination switch in parallel, speed combination switch can be the in the situation that of the complete dead electricity of device, by the overvoltage triggering and conducting current drives speed combination switch closure of trigger module, transformer neutral point capacity earth and directly grounded state transformation are played, avoid direct current to flow into AC transformer, both protected transformer neutral point, again the electric capacity of protective device itself; Both improved the reliability of device, avoided again the further expansion of power grid accident, and avoided resulting in greater loss.
Brief description of the drawings
Fig. 1 is circuit theory diagrams of the present utility model.
Embodiment
As shown in Figure 1, the utility model provides a kind of transformer neutral point DC current restraining device, includes: partiting dc capacitor 1, fast combination switch, rectifier bridge 3, trigger module and protection gap 7,
Partiting dc capacitor 1, is connected between the neutral point N and ground of transformer;
Speed combination switch, fast combination switch 2 is in parallel with partiting dc capacitor 1, when described fast combination switch 2 is opened, fast combination switch is carried out to spring energy-storage, is the quick-make savings ability of fast combination switch, and now transformer neutral point N is by partiting dc capacitor 1 ground connection;
Rectifier bridge 3, input is connected with the two ends of partiting dc capacitor, converts the alternating voltage of transformer neutral point N to direct voltage output to trigger module;
Trigger module, include overvoltage trigger element 5 and thyristor 4, the signal output part of overvoltage trigger element 5 connects the gate pole of thyristor 4, the first output of the anodic bonding rectifier bridge 3 of thyristor 4, negative electrode connects the tripping coil 6 of fast combination switch, and the tripping coil other end connects the second output of rectifier bridge 3.Trigger module detects the magnitude of voltage of rectifier bridge output in real time, in the time overvoltage being detected, triggering and conducting, tripping coil 6 is obtained electric, normally opened contact 2 rapid closings of fast combination switch, now partiting dc capacitor 1 is by fast combination switch short circuit, and transformer neutral point N, by fast combination switch ground connection, exits partiting dc capacitor 1 automatically.
Wherein said thyristor 4 is double-thyristor parallel way; Two-way thyristor is simultaneously by overvoltage trigger element triggering and conducting, first double-thyristor each other stand-by heat improved the reliability of device itself, secondly double-thyristor parallel connection conducting, has improved the through-current capability in thyristor loop, can bear higher fault current.Than only saving cost with a large through-current capability thyristor.
Protection gap 7 is in parallel with partiting dc capacitor 1; between described protection; 7 puncture voltage is adjusted at 2000V; as the backup protection of capacitor and transformer neutral point; in the situation that overvoltage trigger element can not trigger; the effect that prevents transformer neutral point overtension can be played in protection gap, further protects transformer neutral point.
Fast combination switch inside described in the utility model has spring energy-storage and trip coil mechanism, to ensure that switch still can pass through the fault current driving switch rapid closing of thyristor the complete dead electricity in the situation that, closing time only has about a cycle (20ms).What speed combination switch adopted is the fast combination switch of the SH8C-2500 model of the vertical new appliance production in Shanghai.Speed is closed while opening and is driven by motor, splits pass contained spring and carries out accumulation of energy, and the effect of fast combination switch is extremely important, and it has played transformer neutral point capacity earth and directly grounded state transformation.When speed combination switch is opened, transformer neutral point passes through capacitor grounding, can effectively block direct current and flow into neutral point, in the time that partiting dc capacitor 1 both end voltage is greater than trigger voltage threshold value, overvoltage trigger element can trigger thyristor 4 conductings, thyristor On current drives the tripping coil 6 of fast combination switch to make fast combination switch 2 rapid closings, and capacitor is by fast combination switch short circuit, and transformer neutral point is by the direct ground connection of fast combination switch.This process does not rely on extraneous power supply, relies on the overvoltage triggering and conducting current drives speed combination switch closure of thyristor completely.The utility model can the complete dead electricity situation of implement device under; while there is overvoltage in partiting dc capacitor 1 two ends; device still can exit capacitor automatically; play protection partiting dc capacitor 1 and prevent the superpotential effect of transformer neutral point N, transformer neutral point still can reliably return to direct ground connection.
Claims (5)
1. a transformer neutral point DC current restraining device, is characterized in that: include:
Partiting dc capacitor, is connected between the neutral point and ground of transformer;
Speed combination switch, fast combination switch is in parallel with partiting dc capacitor, when described fast combination switch is opened, fast combination switch is carried out to spring energy-storage, is the quick-make savings ability of fast combination switch, and now transformer neutral point is by partiting dc capacitor ground connection;
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 of rectifier bridge output in real time, in the time overvoltage being detected, triggering and conducting, obtains tripping coil electric, the normally opened contact rapid closing of fast combination switch, now partiting dc capacitor is by fast combination switch short circuit, and transformer neutral point is by fast combination switch ground connection, and transformer neutral point exits partiting dc capacitor automatically.
2. transformer neutral point DC current restraining device according to claim 1, is characterized in that: also include protection gap, protection gap is in parallel with partiting dc capacitor.
3. transformer neutral point DC current restraining device according to claim 2, is characterized in that: the puncture voltage in described protection gap is adjusted at 2000V.
4. according to the transformer neutral point DC current restraining device described in claim 1 or 2 or 3, it is characterized in that: described trigger module includes overvoltage trigger element and thyristor, the signal input part of overvoltage trigger element connects the first output of rectifier bridge, the signal output part of overvoltage trigger element connects the gate pole of thyristor, the first output of the anodic bonding rectifier bridge of thyristor, negative electrode connects the tripping coil of fast combination switch, and the tripping coil other end connects the second output of rectifier bridge.
5. transformer neutral point DC current restraining device according to claim 4, is characterized in that: described thyristor is two thyristors, two thyristor parallel connections.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320831764.6U CN203774759U (en) | 2013-12-17 | 2013-12-17 | Direct current inhibition apparatus of transformer neutral point |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320831764.6U CN203774759U (en) | 2013-12-17 | 2013-12-17 | Direct current inhibition apparatus of transformer neutral point |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203774759U true CN203774759U (en) | 2014-08-13 |
Family
ID=51291911
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320831764.6U Expired - Lifetime CN203774759U (en) | 2013-12-17 | 2013-12-17 | Direct current inhibition apparatus of transformer neutral point |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203774759U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103683194A (en) * | 2013-12-17 | 2014-03-26 | 国家电网公司 | Transformer neutral point direct current suppression 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 |
| CN106711945A (en) * | 2016-10-19 | 2017-05-24 | 许继集团有限公司 | Direct current blocking equipment with fault diagnosis function and diagnosis method |
| WO2020069384A1 (en) * | 2018-09-28 | 2020-04-02 | Emprimus, Llc | Power grid protection via transformer neutral blocking systems and triggered phase disconnection |
-
2013
- 2013-12-17 CN CN201320831764.6U patent/CN203774759U/en not_active Expired - Lifetime
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103683194A (en) * | 2013-12-17 | 2014-03-26 | 国家电网公司 | Transformer neutral point direct current suppression 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 |
| CN106711945A (en) * | 2016-10-19 | 2017-05-24 | 许继集团有限公司 | Direct current blocking equipment with fault diagnosis function and diagnosis method |
| 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 |
| WO2020069384A1 (en) * | 2018-09-28 | 2020-04-02 | Emprimus, Llc | Power grid protection via transformer neutral blocking systems and triggered phase disconnection |
| CN113396517A (en) * | 2018-09-28 | 2021-09-14 | 科技持有有限责任公司 | Power grid protection by transformer neutral point blocking system and triggering phase loss |
| JP2022502000A (en) * | 2018-09-28 | 2022-01-06 | テックホールド・エルエルシー | Power grid protection through transformer neutral cutoff system and triggered phase disconnection |
| US11469590B2 (en) | 2018-09-28 | 2022-10-11 | Emprimus, Llc | Power grid protection via transformer neutral blocking systems and triggered phase disconnection |
| US11984720B2 (en) | 2018-09-28 | 2024-05-14 | Techhold Llc | Power grid protection via transformer neutral blocking systems and triggered phase disconnection |
| CN113396517B (en) * | 2018-09-28 | 2024-08-20 | 科技持有有限责任公司 | Power grid protection by transformer neutral point blocking system and triggering phase loss |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20171201 Address after: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Co-patentee after: STATE GRID HENAN ELECTRIC POWER CORPORATION ELECTRIC POWER SCIENCE Research Institute Patentee after: State Grid Corporation of China Co-patentee after: NARI TECHNOLOGY Co.,Ltd. Address before: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Co-patentee before: STATE GRID HENAN ELECTRIC POWER CORPORATION ELECTRIC POWER SCIENCE Research Institute Patentee before: State Grid Corporation of China Co-patentee before: NANJING NARI Group Corp. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140813 |