CN203983954U - Transformer neutral point is through circuit breaker parallel low resistance earthing device - Google Patents
Transformer neutral point is through circuit breaker parallel low resistance earthing device Download PDFInfo
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- CN203983954U CN203983954U CN201420398798.5U CN201420398798U CN203983954U CN 203983954 U CN203983954 U CN 203983954U CN 201420398798 U CN201420398798 U CN 201420398798U CN 203983954 U CN203983954 U CN 203983954U
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- neutral point
- circuit breaker
- transformer
- transformer neutral
- small resistor
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Abstract
The utility model relates to a kind of transformer neutral point through circuit breaker parallel low resistance earthing device, belongs to power system transformer protective device.Hall current instrument transformer one end is connected with the earth connection of transformer neutral point, the other end is connected with the also interface of small resistor and circuit breaker, and master controller is connected with circuit breaker electric with this Hall current instrument transformer respectively.Advantage is novel structure, utilize Hall current instrument transformer to detect in real time the geomagnetic induction current of inflow transformer neutral point, when electric current meets or exceeds when threshold value is set, start the circuit breaker trip that is connected on transformer neutral point, small resistor in parallel is with it sealed in to transformer neutral point, realize transformer neutral point and move through small resistor, reduce geomagnetic induction current, guarantee the safety of electric power system.This device, when effectively preventing and treating geomagnetic induction current, can be realized the function with breaker protection small resistor.
Description
Technical field
The utility model belongs to power system transformer protective device.
Background technology
Along with the increase of China's long distance powedr transmission and electrical network scale, various factors is more and more to the interference of the equipment such as network transformer, protection; Especially the transformer core that the reason such as magnetic storm, direct current transportation, overtension causes is saturated, will have a strong impact on the safe operation of electrical network.Repeatedly there is magnetic storm both at home and abroad and on transmission line, cause geomagnetic induction current invasion and attack grid event, more typically there is geomagnetic induction current to cause the areas such as Quebec, CAN, Malmo, Sweden and have a power failure on a large scale, and the trip protection accident of a large amount of network transformers, transmission line and reactive-load compensation equipment; Domestic Guangdong, Jiangsu, zhejiang and other places have also been found a large amount of geomagnetic induction current invasion and attack grid event, and Bing Yi ridge Australia nuclear power station geomagnetic induction current invasion accident is typical case the most.
Geomagnetic induction current (GIC) can bring a series of adverse effects to the normal operation of a lot of equipment of transformer, instrument transformer, reactor, capacitor and relaying protection etc. in electrical network, and the safety of electrical network, stable operation are constituted a threat to.Because GIC is mainly the transformer inflow system by neutral ground, thereby the improvement of GIC is mainly to start with from transformer at present, takes the method for the restriction GIC such as compensation, isolation and inhibition.The methods such as the compensation of the GIC of above-mentioned discussion, isolation and inhibition, the neutral point that all has a transformer is ground connection effectively, and have problems such as whether can affecting normal, the safe operation of electrical network.
Transformer neutral point is widely used at home through low resistance grounding, facts have proved that transformer neutral point is when low resistance grounding can effectively suppress geomagnetic induction current, can not affect stability and the safety of power system operation, but the problem existing is electric power system while being short-circuited fault, short circuit current flows through the small resistor of neutral point series connection, easily burns series connection small resistor.
Summary of the invention
The utility model provides a kind of transformer neutral point through circuit breaker parallel low resistance earthing device, to solve the problem that geomagnetic induction current exerts an influence to transformer in electrical network and transformer neutral point series connection small resistor easily burns.
The technical scheme that the utility model is taked is: Hall current instrument transformer one end is connected with the earth connection of transformer neutral point, the other end is connected with the also interface of small resistor and circuit breaker, and master controller is connected with circuit breaker electric with this Hall current instrument transformer respectively;
The structure of master controller described in the utility model is: for receiving the low pass filter of Hall current instrument transformer secondary output data, through analog quantity/data volume transducer, be connected with CPU, this CPU is also connected with clock circuit, keyboard, memory, power system of data acquisition port, display respectively, this CPU is also connected with circuit breaker Q F through data volume/analog quantity converter, voltage relay, and this CPU is also connected with outside main PC through receiver.
The resistance of small resistor described in the utility model is 5 ~ 15 ohm.
The utility model has the advantages that novel structure, utilize Hall current instrument transformer to detect in real time the geomagnetic induction current of inflow transformer neutral point, when electric current meets or exceeds when threshold value is set, start the circuit breaker trip that is connected on transformer neutral point, small resistor in parallel is with it sealed in to transformer neutral point, realize transformer neutral point and move through small resistor, reduce geomagnetic induction current, guarantee the safety of electric power system.This device, when effectively preventing and treating geomagnetic induction current, can be realized the function with breaker protection small resistor.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present utility model;
Fig. 2 is the schematic block circuit diagram of the utility model master controller;
Fig. 3 is the utility model power circuit block diagram.
Embodiment
Hall current instrument transformer TA one end is connected with the earth connection of transformer 2 neutral points, the other end is connected with the also interface of small resistor R and circuit breaker Q F, and master controller 1 is electrically connected to this Hall current instrument transformer TA and circuit breaker Q F respectively;
The structure of master controller 1 described in the utility model is: for receiving the low pass filter 101 of Hall current instrument transformer secondary output data, through analog quantity/data volume transducer 102, be connected with CPU 103, this CPU is also connected with clock circuit 104, keyboard 105, memory 106, power system of data acquisition port one 07, display 108 respectively, this CPU is also connected with circuit breaker Q F through data volume/analog quantity converter 109, voltage relay 110, and this CPU is also connected with outside main PC through receiver 111.
The resistance of small resistor R described in the utility model is 5 ~ 15 ohm.
The utility model is not having geomagnetic induction current GIC when invasion, breaker closing, neutral point reliable ground; When geomagnetic induction current is invaded and surpass setting threshold, circuit breaker trip, Neutral Point Through Low Resistance; At geomagnetic induction current, during lower than setting threshold, breaker closing, by parallel low resistance short circuit, is realized neutral point effective grounding; When system is short-circuited fault, breaker closing, by parallel low resistance short circuit, is protected small resistor.
The major function of the utility model master controller has: (1) provides power supply for Hall current instrument transformer and master controller self, power circuit basic comprising as shown in Figure 3, from transformer control cubicle, get AC220V voltage, through AC/DC module output+12V voltage, through power circuit to Hall transformer for supplying power, DC12V voltage is DC5V voltage through 7805 voltage stabilizing circuit step-downs, supplies with master controller power supply.(2) receive the secondary output data of Hall current instrument transformer, the output data of Hall current instrument transformer are passed through low pass filter filtering by data wire and are delivered to analog quantity/data volume transducer (A/D), analog signal is changed into digital signal, and give CPU main system, CPU main system receives, record, and upload data in Substation control monitoring PC in the heart, realize there the functions such as data analysis, storage, generating report forms printing.(3) when geomagnetic induction current being detected over setting threshold, detect circuit breaker in combined floodgate running status, start circuit breaker trip; If circuit breaker detected in gate-dividing state when geomagnetic induction current transfinites, keep circuit breaker to operate in gate-dividing state; When geomagnetic induction current coordinates circuit-breaker status audit function during lower than setting threshold, circuit breaker operates in "on" position.(4) by power system of data acquisition port, obtain protecting electrical power system data; and coordinate adjusting of relay protection of power system; when there is magnetic storm; electric power system is broken down; the requirement of preferential execution relay protection of power system to transformer neutral point operational mode, completes the switching of the High Voltage Circuit Breaker Condition.(5) utilize keyboard to realize setting parameter function.(6) Presentation Function.(7) data storage.
Claims (3)
1. a transformer neutral point is through circuit breaker parallel low resistance earthing device, it is characterized in that: Hall current instrument transformer one end is connected with the earth connection of transformer neutral point, the other end is connected with the also interface of small resistor and circuit breaker, and master controller is connected with circuit breaker electric with this Hall current instrument transformer respectively.
2. transformer neutral point according to claim 1 is through circuit breaker parallel low resistance earthing device, it is characterized in that: the structure of described master controller is: for receiving the low pass filter of Hall current instrument transformer secondary output data, through analog quantity/data volume transducer, be connected with CPU, this CPU is also connected with clock circuit, keyboard, memory, power system of data acquisition port, display respectively, this CPU is also connected with circuit breaker Q F through data volume/analog quantity converter, voltage relay, and this CPU is also connected with outside main PC through receiver.
3. transformer neutral point according to claim 1 and 2, through circuit breaker parallel low resistance earthing device, is characterized in that: the resistance of described small resistor is 5 ~ 15 ohm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420398798.5U CN203983954U (en) | 2014-07-18 | 2014-07-18 | Transformer neutral point is through circuit breaker parallel low resistance earthing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420398798.5U CN203983954U (en) | 2014-07-18 | 2014-07-18 | Transformer neutral point is through circuit breaker parallel low resistance earthing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203983954U true CN203983954U (en) | 2014-12-03 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420398798.5U Expired - Fee Related CN203983954U (en) | 2014-07-18 | 2014-07-18 | Transformer neutral point is through circuit breaker parallel low resistance earthing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203983954U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106410619A (en) * | 2016-08-28 | 2017-02-15 | 安徽普天电力科技有限公司 | Opening prevention type quick switch cabinet |
| CN108258682A (en) * | 2018-01-11 | 2018-07-06 | 内蒙古科技大学 | The control method and system of a kind of electric network geomagnetic induction current |
| CN111224376A (en) * | 2020-04-10 | 2020-06-02 | 湖南省湘电试研技术有限公司 | Low-voltage distribution network electric shock protection method and protection device |
-
2014
- 2014-07-18 CN CN201420398798.5U patent/CN203983954U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106410619A (en) * | 2016-08-28 | 2017-02-15 | 安徽普天电力科技有限公司 | Opening prevention type quick switch cabinet |
| CN108258682A (en) * | 2018-01-11 | 2018-07-06 | 内蒙古科技大学 | The control method and system of a kind of electric network geomagnetic induction current |
| CN108258682B (en) * | 2018-01-11 | 2019-03-19 | 内蒙古科技大学 | A kind of control method and system of electric network geomagnetic induction current |
| CN111224376A (en) * | 2020-04-10 | 2020-06-02 | 湖南省湘电试研技术有限公司 | Low-voltage distribution network electric shock protection method and protection device |
| CN111224376B (en) * | 2020-04-10 | 2020-09-25 | 湖南省湘电试研技术有限公司 | Low-voltage distribution network electric shock protection method and protection device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141203 Termination date: 20160718 |