CN203014359U - Busbar residual voltage maintaining device - Google Patents
Busbar residual voltage maintaining device Download PDFInfo
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- CN203014359U CN203014359U CN 201220701843 CN201220701843U CN203014359U CN 203014359 U CN203014359 U CN 203014359U CN 201220701843 CN201220701843 CN 201220701843 CN 201220701843 U CN201220701843 U CN 201220701843U CN 203014359 U CN203014359 U CN 203014359U
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Abstract
The utility model discloses a busbar residual voltage maintaining device. The device comprises a measurement and control unit, a high-impedance current-limiting unit, and a vacuum circuit breaker, a quick transverter, a Rock coil and a current transformer which are connected with the measurement and control unit; and the quick transverter and the Rock coil are connected in series to form a path, the path is connected with the high-impedance current-limiting unit in parallel to form a short circuit protection circuit, and the vacuum circuit breaker, the short circuit protection circuit and the current transformer are connected in series. The busbar residual voltage maintaining device is simple in structure and low in manufacturing cost, the impedance of a subcircuit in which a short circuit fault occurs is increased to more than twenty times the total impedance of an associated system in 20 milliseconds, and the busbar residual voltage is recovered to and maintained higher than 95% of the rated voltage. After using the busbar residual voltage maintaining device in the utility model, when a short circuit fault occurs in a subcircuit, the busbar residual voltage can be quickly recovered and maintained.
Description
Technical field
The utility model relates to the branch, short-circuit protective device of medium voltage network, concrete a kind of bus residual voltage holding device.
Background technology
In the electric power system of electric power network medium voltage network or a certain electric pressure of enterprises medium voltage network, if a certain branch road is short-circuited, suddenly fall seriously with voltage on bus that this branch road is connected, the voltage of bus remnants (hereinafter referred to as residual voltage) is general lower than 20% of rated voltage, only have this branch breaker of working as to cut-off, excised short trouble, busbar voltage could be recovered.Busbar voltage is exactly the time that short trouble cut-offs in China's existing circuit breaker (switch) from suddenly dropping to recovery during this period of time; greatly about 70～100ms left and right; it is the time (10ms-20ms) of computer integrated protection failure judgement; add circuit breaker intrinsic operate time (40ms-60ms), add electric arc zero-crossing timing (﹤ 20ms left and right).Busbar voltage depression occurs during this period of time, and Enterprise Power System is referred to as " rolling electricity ".
" rolling electricity " between the emergence period, the bus residual voltage is very low, and the interconnected system load running of some faults that are not short-circuited is interrupted, as: the outage such as frequency converter, electromagnetically operated valve.These loads to " rolling electricity " significant reaction are referred to as sensitive loads, are characterized in mechanical movement and electric energy are arranged or the existence of magnetic energy energy-storage travelling wave tube.
the motor that uses in enterprise mostly is asynchronous machine, and the maintenance of the rotating magnetic field of asynchronous machine comes from the reactive power support of electrical network, during certain branch, short-circuit, the bus residual voltage is very low, asynchronous machine on other branch roads can not get reactive power support, and also will be to the short dot output short circuit current, the short circuit time constant τ of asynchronous machine is generally below 30ms, " rolling electricity " be 3 τ around, press the magnetic field approach exhaustion of the asynchronous machine of index law decay, the moment that voltage recovers after the short circuit trouble point excision, electrical network rebuilds to asynchronous machine the impact that magnetic field has produced 5-7 times of rated current, cause protective relaying maloperation to do.
The domestic interconnected system failure problems of bringing for solving short trouble at present, use industrial UPS and improve the ancillary techniques such as motor impedance and solve relay and interconnected system load running disruption, but after can't solving trouble shooting starting current to the motor shock problem.
The utility model content
The technical problems to be solved in the utility model is to provide a kind of bus residual voltage holding device, it is simple in structure, be installed on the branch road of medium voltage network, effectively utilize Rogowski coil detection branch short-circuit state, in time excision short circuit part, guarantee the normal use of branch road, the bus residual voltage can be recovered rapidly and be maintained.
The technical solution of the utility model is:
A kind of bus residual voltage holding device comprises measurement and control unit, high impedance current limliting unit, and the vacuum circuit-breaker that is connected with measurement and control unit respectively, converter, Rogowski coil summation current transformer fast; Described quick converter is connected with Rogowski coil and is formed path, path and high impedance current limliting unit formation in parallel short-circuit protection circuit, and described vacuum circuit-breaker, short-circuit protection circuit summation current transformer are connected in series.
The output of described vacuum circuit-breaker is connected with the input of the input of path, high impedance current limliting unit respectively, and the input of described current transformer is connected with the output of the output of path, high impedance current limliting unit respectively.
The output of described quick converter is connected with the input of Rogowski coil and is formed path, and the input of converter is as the input of path fast, and the output of Rogowski coil is as the output of path.
Electric capacity, resistance or inductance are selected in described high impedance current limliting unit.
Advantage of the present utility model:
The utility model is according to Rogowski coil detection branch short-circuit state, during short circuit, make electric current pass through high impedance current limliting unit, limiting short-circuit current, amplitude of short circuit reduces greatly, makes branch equipment in 6～16 milliseconds of the faults of being short-circuited, and the bus residual voltage is remained on more than 95% of rated voltage, guarantee other fault-free branch road sensitive loads normal operations, the suffered short-circuit impacts of equipment such as while main transformer reduce greatly;
The utility model is provided with vacuum circuit-breaker, when short trouble can't be removed, disconnects vacuum circuit-breaker, makes electric current thoroughly cut off branch current by high impedance current limliting unit, makes busbar voltage recover normal;
Then current transformer Real-time Collection branch current of the present utility model is transferred to measurement and control unit, during near rated current, measurement and control unit is given quick converter order immediately when the detection branch electric current, and converter is closed fast, high impedance current limliting unit withdraws from, and short circuit branch can be recovered normal operation;
The utility model is simple in structure, cost of manufacture is low, is increased to more than 20 times of interconnected system total impedance at 20 milliseconds with the interior branch impedance that short trouble will occur, the bus residual voltage is recovered and remained to more than 95% of rated voltage; After using the utility model bus residual voltage holding device, when being short-circuited fault in branch road, the bus residual voltage can be recovered rapidly and be maintained.
Description of drawings
Fig. 1 is structural representation of the present utility model.
Fig. 2 is mounting structure schematic diagram of the present utility model.
Embodiment
See Fig. 1, a kind of bus residual voltage holding device comprises measurement and control unit, high impedance current limliting unit R, and the vacuum circuit-breaker QF that is connected with measurement and control unit respectively, fast converter ZK, Rogowski coil LK summation current transformer CT; The output of converter ZK is connected with the input of Rogowski coil LK and is formed path fast; path and high impedance current limliting unit R formation in parallel short-circuit protection circuit; and the output of vacuum circuit-breaker QF is connected with the input of path, the input of high impedance current limliting unit R respectively, and the input of Current Transmit is connected with the output of path, the output of high impedance current limliting unit R respectively.
See Fig. 2, the utility model is installed on branch road, its vacuum circuit-breaker QF input be connected with bus, the output of its Current Transmit is connected with branch bar, wherein, d is short dot.
Use principle of the present utility model:
(1), when short circuit appears in branch road, measurement and control unit is by Rogowski coil LK monitoring branch, short-circuit electric current, when short circuit current greater than set point, measurement and control unit sends actuating signal to quick converter ZK, converter ZK disconnects path fast in the 2-3 millisecond fast, the short circuit current change of current enters in high impedance current limliting unit R by vacuum circuit-breaker QF, limiting short-circuit current, amplitude of short circuit reduces greatly, make branch equipment in 6～16 milliseconds of the faults of being short-circuited, the bus residual voltage is remained on more than 95% of rated voltage, guarantee other fault-free branch road sensitive loads normal operations, the suffered short-circuit impacts of equipment such as while main transformer reduce greatly,
(2), after the excision of the short trouble in branch road, the branch road electrical transmission of Current Transmit Real-time Collection is to measurement and control unit, when branch current during near rated current, measurement and control unit is given quick converter ZK order immediately, converter ZK is closed in 10 milliseconds fast, high impedance current limliting unit withdraws from, and short circuit branch can be recovered normal operation;
(3), the be short-circuited branch road of fault is being short-circuited over 300 milliseconds, fault is not still removed, measurement and control unit is judged according to the collection value of Rogowski coil LK summation current transformer CT and is thought that the fault point fault do not remove yet, send ON-and OFF-command for immediately vacuum circuit-breaker QF, thoroughly this branch road of excision, make busbar voltage recover normal.
Claims (4)
1. bus residual voltage holding device is characterized in that: comprise measurement and control unit, high impedance current limliting unit, and the vacuum circuit-breaker that is connected with measurement and control unit respectively, converter, Rogowski coil summation current transformer fast; Described quick converter is connected with Rogowski coil and is formed path, path and high impedance current limliting unit formation in parallel short-circuit protection circuit, and described vacuum circuit-breaker, short-circuit protection circuit summation current transformer are connected in series.
2. a kind of bus residual voltage holding device according to claim 1, it is characterized in that: the output of described vacuum circuit-breaker is connected with the input of the input of path, high impedance current limliting unit respectively, and the input of described current transformer is connected with the output of the output of path, high impedance current limliting unit respectively.
3. a kind of bus residual voltage holding device according to claim 1, it is characterized in that: the output of described quick converter is connected with the input of Rogowski coil and is formed path, the input of converter is as the input of path fast, and the output of Rogowski coil is as the output of path.
4. a kind of bus residual voltage holding device according to claim 1 is characterized in that: electric capacity, resistance or inductance are selected in described high impedance current limliting unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220701843 CN203014359U (en) | 2012-12-18 | 2012-12-18 | Busbar residual voltage maintaining device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220701843 CN203014359U (en) | 2012-12-18 | 2012-12-18 | Busbar residual voltage maintaining device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203014359U true CN203014359U (en) | 2013-06-19 |
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ID=48605916
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220701843 Expired - Lifetime CN203014359U (en) | 2012-12-18 | 2012-12-18 | Busbar residual voltage maintaining device |
Country Status (1)
| Country | Link |
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| CN (1) | CN203014359U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106208003A (en) * | 2016-08-28 | 2016-12-07 | 安徽普天电力科技有限公司 | A kind of bus residual voltage holding means |
| CN109921375A (en) * | 2019-02-02 | 2019-06-21 | 中国电力科学研究院有限公司 | Short circuit current consumption branch withdrawal control method and device based on voltage characteristic |
| CN109962447A (en) * | 2019-02-02 | 2019-07-02 | 中国电力科学研究院有限公司 | Short circuit current consumption branch withdrawal control method and device based on overcurrent protection |
-
2012
- 2012-12-18 CN CN 201220701843 patent/CN203014359U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106208003A (en) * | 2016-08-28 | 2016-12-07 | 安徽普天电力科技有限公司 | A kind of bus residual voltage holding means |
| CN109921375A (en) * | 2019-02-02 | 2019-06-21 | 中国电力科学研究院有限公司 | Short circuit current consumption branch withdrawal control method and device based on voltage characteristic |
| CN109962447A (en) * | 2019-02-02 | 2019-07-02 | 中国电力科学研究院有限公司 | Short circuit current consumption branch withdrawal control method and device based on overcurrent protection |
| CN109962447B (en) * | 2019-02-02 | 2022-09-20 | 中国电力科学研究院有限公司 | Short-circuit current absorption branch exit control method and device based on overcurrent protection |
| CN109921375B (en) * | 2019-02-02 | 2023-10-13 | 中国电力科学研究院有限公司 | Short-circuit current absorption branch exit control method and device based on voltage characteristics |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: Bus residual voltage holding device Effective date of registration: 20160729 Granted publication date: 20130619 Pledgee: Hefei high tech Company limited by guarantee Pledgor: ANHUI HUIDIAN TECHNOLOGY Co.,Ltd. Registration number: 2016340000038 |
|
| PLDC | Enforcement, change and cancellation of contracts on pledge of patent right or utility model | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20170619 Granted publication date: 20130619 Pledgee: Hefei high tech Company limited by guarantee Pledgor: ANHUI HUIDIAN TECHNOLOGY Co.,Ltd. Registration number: 2016340000038 |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130619 |