CN203504132U - Overcurrent protection device for mining mobile transformer station of flame-proof type - Google Patents
Overcurrent protection device for mining mobile transformer station of flame-proof type Download PDFInfo
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- CN203504132U CN203504132U CN201320512046.2U CN201320512046U CN203504132U CN 203504132 U CN203504132 U CN 203504132U CN 201320512046 U CN201320512046 U CN 201320512046U CN 203504132 U CN203504132 U CN 203504132U
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Abstract
The utility model discloses an overcurrent protection device for a mining mobile transformer station of a flame-proof type, and solves a problem that a conventional overcurrent protection device for a mobile transformer station cannot be started quickly in the prior art when short circuit happens to a circuit. The device is characterized in that the output end of a dry-type transformer is electrically connected with a load (9) through an output circuit (7); the output circuit (7) is provided with a three-phase current transformer (8) which is electrically connected with the output end of a programmable controller (10); a control-loop transformer (2) is connected in parallel between the C and A phases of a three-phase high-voltage power supply; one output end of the control-loop transformer (2) is electrically connected with one end of a stop button (3), and other end of the stop button (3) is electrically connected with one end of a circuit-breaker opening coil (4); the other end of the circuit-breaker opening coil (4) is electrically connected with the other output end of the control-loop transformer (2); and two ends of the stop button (3) are respectively in electrical connection with the output end of the programmable controller (10). The device provided by the utility model effectively protects a low-voltage contactor from being burnt out.
Description
Technical field
The utility model relates to the high-voltage switch gear overcurrent protective device of the flameproof mining mobile transformer substation in power supplying and distributing equipment under a kind of coal mine.
Background technology
Severe operational environment, the load condition in down-hole is unstable, gas and coal dust gathers, the factors such as roof fall of dripping all can make down-hole insulation of electrical installation intensity decline; operating personnel safeguard improper or operating mistake; the reasons such as the wire fracture of transmission line, also often can make down-hole transmission line be short-circuited.Flameproof mining mobile transformer substation is the power supply of various power supply units on down-hole combined mining working, if this equipment because overcurrent damages, will have a strong impact on the normal order of work in down-hole.Particularly underground equipment branch road is short-circuited, short circuit current can be very large, the electric current breaking capacity that has exceeded low tension switch contactor itself, at this moment disconnect contactor and be easy to burn out contactor, or there is overstep tripping and cause large-area power-cuts, bring great potential safety hazard, mobile substation main circuit must be cut off, to guarantee the safety of the whole electric power system in down-hole.
Summary of the invention
The utility model provides a kind of flameproof mining mobile transformer substation overcurrent protective device, when having solved prior art and having short circuit phenomenon to occur in circuit being detected, and the technical problem that mobile substation overcurrent protective device can not start rapidly.
The utility model is to solve by the following technical programs above technical problem:
A kind of flameproof mining mobile transformer substation overcurrent protective device, comprise three-phase high-voltage power supply, dry-type transformer and load, three-phase high-voltage power supply is electrically connected to the input of dry-type transformer by circuit breaker, the output of dry-type transformer is electrically connected to load by output circuit, on output circuit, be provided with threephase current transformer, threephase current transformer is electrically connected to the input of Programmable Logic Controller, an input of control loop transformer is electrically connected to the C phase power supply of three-phase high-voltage power supply, another input of control loop transformer is electrically connected to the A phase power supply of three-phase high-voltage power supply, an output of control loop transformer is electrically connected to the one end that stops knob by the 3rd fuse, the other end that stops knob being electrically connected to one end of breaker open operation coil, the other end of breaker open operation coil is electrically connected to another output of control loop transformer, the two ends that stop knob being electrically connected to the output of Programmable Logic Controller respectively.
Between an input of the C of three-phase high-voltage power supply phase power supply and control loop transformer, be in series with the first fuse, between the A of three-phase high-voltage power supply phase power supply and another input of control loop transformer, be in series with the second fuse.
The utility model is when circuit is short-circuited fault; low voltage electric network PLC intelligent protection module can be according to gathering electric current, voltage signal, judgement, the different feedback signal of relatively more last output; finally selectively cut off the electricity supply; both realized short circuit trip avoidance function; again lv contactor is protected, also avoided the generation of overstep tripping accident simultaneously.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model is elaborated:
A kind of flameproof mining mobile transformer substation overcurrent protective device, comprise three-phase high-voltage power supply 1, dry-type transformer 6 and load 9, three-phase high-voltage power supply 1 is electrically connected to the input of dry-type transformer 6 by circuit breaker 5, the output of dry-type transformer 6 is electrically connected to load 9 by output circuit 7, on output circuit 7, be provided with threephase current transformer 8, threephase current transformer 8 is electrically connected to the input of Programmable Logic Controller 10, an input of control loop transformer 2 is electrically connected to the C phase power supply of three-phase high-voltage power supply 1, another input of control loop transformer 2 is electrically connected to the A phase power supply of three-phase high-voltage power supply 1, an output of control loop transformer 2 is electrically connected to the one end that stops knob 3 by the 3rd fuse FU3, the other end that stops knob 3 is electrically connected to one end of breaker open operation coil 4, the other end of breaker open operation coil 4 is electrically connected to another output of control loop transformer 2, the two ends that stop knob 3 are electrically connected to the output of Programmable Logic Controller 10 respectively.
Between an input of the C of three-phase high-voltage power supply 1 phase power supply and control loop transformer 2, be in series with the first fuse FU1, between the A of three-phase high-voltage power supply 1 phase power supply and another input of control loop transformer 2, be in series with the second fuse FU2.
Design principle of the present utility model is: when short circuit occurs, can not only analyze and judge high-pressure side short circuit or low-pressure side is short-circuited, and by comparing size of current, judge it is the circuit breaker in disjunction high-pressure vacuum switch, or the contactor in low-voltage combination switch.When low-pressure side is short-circuited and when short circuit current exceeds the breaking capacity of contactor, the circuit breaker in disjunction high-pressure vacuum switch, thus effectively protect lv contactor not to be burned, moreover also avoid overstep tripping, and affect other equipment power supplies.Mobile substation increases low voltage electric network intelligent protection module with unit switch, according to the size of line short circuit current, through PLC program, judges whether short circuit current exceeds the breaking capacity of contactor, makes rational tripping operation and selects.If short circuit current is within the scope of the disjunction of contactor, PLC output contactor breaking signal control contactor disconnects; If short circuit current has exceeded the breaking capacity of contactor, PLC output circuit breaker breaking signal is controlled high-pressure vacuum breaker and is disconnected.
Claims (2)
1. a flameproof mining mobile transformer substation overcurrent protective device, comprise three-phase high-voltage power supply (1), dry-type transformer (6) and load (9), three-phase high-voltage power supply (1) is electrically connected to the input of dry-type transformer (6) by circuit breaker (5), the output of dry-type transformer (6) is electrically connected to load (9) by output circuit (7), it is characterized in that, on output circuit (7), be provided with threephase current transformer (8), threephase current transformer (8) is electrically connected to the input of Programmable Logic Controller (10), an input of control loop transformer (2) is electrically connected to the C phase power supply of three-phase high-voltage power supply (1), another input of control loop transformer (2) is electrically connected to the A phase power supply of three-phase high-voltage power supply (1), an output of control loop transformer (2) is electrically connected to the one end that stops knob (3) by the 3rd fuse (FU3), the other end that stops knob (3) is electrically connected to one end of breaker open operation coil (4), the other end of breaker open operation coil (4) is electrically connected to another output of control loop transformer (2), the two ends that stop knob (3) are electrically connected to the output of Programmable Logic Controller (10) respectively.
2. a kind of flameproof mining mobile transformer substation overcurrent protective device according to claim 1; it is characterized in that; between the C phase power supply of three-phase high-voltage power supply (1) and an input of control loop transformer (2), be in series with the first fuse (FU1), between the A phase power supply of three-phase high-voltage power supply (1) and another input of control loop transformer (2), be in series with the second fuse (FU2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320512046.2U CN203504132U (en) | 2013-08-21 | 2013-08-21 | Overcurrent protection device for mining mobile transformer station of flame-proof type |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320512046.2U CN203504132U (en) | 2013-08-21 | 2013-08-21 | Overcurrent protection device for mining mobile transformer station of flame-proof type |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203504132U true CN203504132U (en) | 2014-03-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320512046.2U Expired - Fee Related CN203504132U (en) | 2013-08-21 | 2013-08-21 | Overcurrent protection device for mining mobile transformer station of flame-proof type |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203504132U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112582970A (en) * | 2020-12-14 | 2021-03-30 | 湖南顶立科技有限公司 | Graphite resistance furnace load short circuit processing method and system |
-
2013
- 2013-08-21 CN CN201320512046.2U patent/CN203504132U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112582970A (en) * | 2020-12-14 | 2021-03-30 | 湖南顶立科技有限公司 | Graphite resistance furnace load short circuit processing method and system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20180928 Address after: 030009 Shanxi comprehensive reform demonstration zone, Taiyuan, Shanxi, Taiyuan, 280 Co-patentee after: Shanxi Fenxi Machinery Co., Ltd. Patentee after: Shanxi Fenxi heavy industry Ship Electric Co., Ltd. Address before: No. 131, Heping North Road, Taiyuan, Shanxi Province, Shanxi Patentee before: Shanxi Fenxi Machinery Co., Ltd. |
|
| TR01 | Transfer of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140326 Termination date: 20190821 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |