CN201113452Y - Restricted surge switching device - Google Patents
Restricted surge switching device Download PDFInfo
- Publication number
- CN201113452Y CN201113452Y CNU2007200079413U CN200720007941U CN201113452Y CN 201113452 Y CN201113452 Y CN 201113452Y CN U2007200079413 U CNU2007200079413 U CN U2007200079413U CN 200720007941 U CN200720007941 U CN 200720007941U CN 201113452 Y CN201113452 Y CN 201113452Y
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- CN
- China
- Prior art keywords
- inrush current
- circuit breaker
- control
- switch
- drive unit
- 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.)
- Expired - Lifetime
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Abstract
The utility model relates to an adjustment device for a power supply or power distribution circuit, in particular to a switching device for limiting inrush current, which comprises a resistor, an on/off switch, a circuit breaker and a control device which is in control connection with the on/off switch and the circuit breaker, wherein, the resistor is serially connected with the on/off switch and then is parallelly connected with the circuit breaker, and a circuit which is parallelly connected is serially connected into a three-phase line of power grid equipment. The utility model is characterized in that: the device overcomes the technical prejudice of the technical personnel in the field; the provided switching device for limiting inrush current adopts the resistor as the electrical equipment used to control the excitation inrush current, exits the resistor in time under the condition of finishing the control of excitation inrush current to ensure that the system can normally operate, and achieves a rather good technical effect; the adjustment device has simple and convenient operation, greatly saves the cost, and has rather high economic value.
Description
Technical field
The utility model relates to the adjusting device of a kind of power supply or power distribution circuit, particularly a kind of limitation inrush current push-pull device.
Background technology
In the outlying district, power load disperse and power supply capacity little (combine with diesel generation or offshore oil platform is sent out supply terminals) as wind power plant also than dispersion, as networking with electric power system, its expense expense than self-built minor scale power net again is very manyly big, can only select to build minor scale power net for this reason, the general supply installed capacity that causes minor scale power net and transformer separate unit capacity ratio also less (below 3-4).When minor scale power net drops into unloaded transformer, because its magnetizing inrush current maximum can reach 6-8 times of transformer rated current, so big shoving adds in the electrical network will make mains breakdown, therefore must take to limit the measure of shoving.The current measure of generally taking is to adopt the electronic power switch that can control switching angle, energized when it can realize that alternating voltage reaches maximum, and under the situation of not considering the influence of transformer core remanent magnetism, magnetizing inrush current is minimum like this.Yet consider the influence of transformer core remanent magnetism, still magnetizing inrush current will occur, but magnetizing inrush current will be limited in the less scope of bearing.Also have the way that proposes to adopt shunt capacitor at home, but the problem of equally also cored remanent magnetism influence, also additional in addition have condenser capacity control problem, is difficult to concrete enforcement.It is feasible adopting electronic power switch restriction magnetizing inrush current, but its cost is too high, electronic power switch one cover (or) as 35KV is common SF6 circuit breaker or more than ten times (about 100,000 yuan of every cost of SF6 or vacuum circuit-breaker) of vacuum circuit-breaker cost, and the domestic this product (electronic power switch) of not producing, need be from abroad stocking up, installing still, maintenance all needs sizable human and material resources and financial resources.
Invention constitutes
The purpose of this utility model is to provide a kind of simple to operation and can effectively suppress magnetizing inrush current, significantly reduce the limitation inrush current push-pull device of cost simultaneously according to the deficiencies in the prior art part.
The utility model is realized by following approach:
Limitation inrush current push-pull device, its structural feature is, include resistance, deciliter switch, circuit breaker and with the control device of deciliter switch and circuit breaker control connection, resistance and deciliter switch back that is connected in series is in parallel with circuit breaker in succession, and the circuit after connecing is connected in series in the three-phase line of grid equipment.
The technology of the present invention can apply to most of occasion that needs the restriction magnetizing inrush current, in specification of the present invention, adopts this grid equipment of transformer to illustrate that as an example the concrete invention of magnetizing inrush current constitutes.During normal the operation, the exciting current of transformer is below 1% transformer rated current, and corresponding excitation impedance is very big, drops into unloaded transformer and can cause core sataration and very big magnetizing inrush current occur when voltage zero-cross, and corresponding excitation impedance becomes very little.At this moment, employing seals in resistance and throws unloaded transformer, when the absolute resistance of resistance during much larger than saturated excitation impedance, switching current will be limited in certain limit, and can reduce the damping time constant of loop DC component greatly, and DC component is decayed to approach 0, thereby can eliminate the influence of magnetizing inrush current to minor scale power net.
Specifically can operate as follows by control device: when throwing unloaded transformer, deciliter switch closes a floodgate earlier, and switching current will be limited in certain limit owing to sealed in resistance this moment, and DC component is decayed to approach 0.The circuit breaker that closes in limited time more just can drop into unloaded transformer safely, disconnects deciliter switch after transformer drops into immediately, enters normal operating condition.If a deciliter switch caters to the fault point, when closing after-current and can not descend, control device will disconnect a deciliter switch in limited time, and stop the closing operation to circuit breaker.
Above limitation inrush current push-pull device simple to operate do not need to control switching angle, all can drop into operation at any time, and be therefore easy to operate; It needs the make-and-break time of control deciliter switch and circuit breaker in addition, and this can achieve the goal by simple setting, and is therefore simple to operate; Because the utility model quoted this resistive electronic component of resistance, can make switching current DC component within the specific limits and big at short notice high attenuation, even to zero, effect of its control magnetizing inrush current also is goodish.The cost of this covering device only is about 2 times of normal circuit breaker, and product can be manufactured at home, be to install or safeguard all extremely convenient and simplely, the equipment of therefore greatly having saved is installed and the cost of maintenance and repair from purchasing to, has quite high economic worth.
In the art, because what the grid equipment majority will be considered all is the calculating of reactance value, therefore in the solution process of present technique problem, those skilled in the art only considers to add in the line the equipment with reactance value, as capacitor, perhaps directly adopt switch to control, thereby formed a kind of technology prejudice, think that promptly the inapplicable resistance of technical problem proposed by the invention solves, yet those skilled in the art but overcome this technology prejudice, adopted resistance to solve the problem of magnetizing inrush current, this is because magnetizing inrush current mostly is DC component, so also reached following technique effect: simple to operate, convenient, provide cost savings greatly, have quite high economic worth.
The utility model can further be specially:
Control device includes current sensing means, drive unit and time set, the control output end of time set is connected with two control trigger ends of drive unit respectively with the control output end of current sensing means, and a trigger end of drive unit is connected with the timing trigger end of time set.
When beginning to drop into the no-load transformer operation, driving device controls deciliter switch closure and circuit breaker disconnects, and the triggering timing device picks up counting; In the timing time of setting, if detecting magnetizing inrush current, current sensing means is effectively controlled, it will transmit control signal to drive unit; Arrived timing time, time set also will transmit control signal to drive unit, after drive unit receives the control signal of current sensing means and time set at the same time, send and disconnect deciliter switch immediately after drive control signal control breaker closing is connected, in the timing time of setting, current sensing means detects electric current and does not descend, it will can not transmit control signal to drive unit, drive unit will be in the time of setting, after promptly receiving the control signal of time set, disconnect deciliter switch, and stop the combined floodgate of circuit breaker.
Deciliter switch can have following selection:
Deciliter switch is a kind of vacuum contactor, and perhaps deciliter switch is a kind of on-load switch.
As the switch that controlling resistance inserts, deciliter switch can also have multiple choices, as long as can satisfy under the relevant voltage condition the access of resistance or disconnect control.
Circuit breaker can have following selection:
Circuit breaker is a kind of SF
6Circuit breaker, perhaps circuit breaker is a kind of vacuum circuit-breaker.
Circuit breaker mainly is to have controlled the resistance short circuit of magnetizing inrush current after having controlled magnetizing inrush current originally and with its circuit that logs off, is not need resistance to insert when normal operation.The selection of circuit breaker can also be other exercisable circuit breakers under the corresponding voltage condition except enumerate two kinds.
Included current sensing means, drive unit and the time set of control device all is integrated in the control chip, and the model of this control chip is: ISD1420.Control chip also can adopt other can realize and the chip model of the constructed effect of this control device that above model just exemplifies.
In sum, characteristics of the present utility model are, overcome those skilled in the art's technology prejudice, the limitation inrush current push-pull device that is provided has adopted the electric equipment of resistance as the control magnetizing inrush current, and having controlled under the situation of magnetizing inrush current, in time withdraws from resistance, the system that makes can normally move, reached goodish technique effect: simple, convenient, provide cost savings greatly, have quite high economic worth.
Description of drawings
Figure 1 shows that the electrical block diagram of limitation inrush current push-pull device described in the utility model;
Figure 2 shows that the control device framework schematic diagram of limitation inrush current push-pull device described in the utility model.
Below in conjunction with embodiment the utility model is described further.
Specific embodiment
Most preferred embodiment:
With reference to accompanying drawing 1, limitation inrush current push-pull device, include resistance R, deciliter switch CZ, circuit breaker CB and with the control device of deciliter switch CZ and circuit breaker CB control connection, resistance R is connected in series back in parallel in succession with circuit breaker CB with a deciliter switch CZ, and the circuit after connecing is connected in series in the three-phase line of transformer B, be in the three-phase line, each all is equipped with the limitation inrush current push-pull device of a cover mutually.Wherein a deciliter switch CZ is a kind of on-load switch, and circuit breaker CB is a kind of SF
6Circuit breaker.
With reference to accompanying drawing 2, control device includes current sensing means, drive unit and time set, the control output end of time set is connected with two control trigger ends of drive unit respectively with the control output end of current sensing means, and a trigger end of drive unit is connected with the timing trigger end of time set.Wherein current sensing means, drive unit and time set all are integrated in the control chip, and the model of this control chip is: RTOS ISD1420.When beginning to drop into the no-load transformer operation, driving device controls deciliter switch closure and circuit breaker disconnects, and the triggering timing device picks up counting; In the timing time of setting, if detecting magnetizing inrush current, current sensing means is effectively controlled, it will transmit control signal to drive unit; Arrived timing time, time set also will transmit control signal to drive unit, after drive unit receives the control signal of current sensing means and time set at the same time, disconnect deciliter switch CZ immediately after sending closed connection of drive control signal control circuit breaker CB, in the timing time of setting, current sensing means detects electric current and does not descend, it will can not transmit control signal to drive unit, drive unit will be in the time of setting, after promptly receiving the control signal of time set, disconnect deciliter switch CZ, and stop the combined floodgate of circuit breaker CB.
It is same as the prior art that the utility model is not stated part.
Claims (5)
1, limitation inrush current push-pull device, it is characterized in that, include resistance, deciliter switch, circuit breaker and with the control device of deciliter switch and circuit breaker control connection, resistance and deciliter switch back that is connected in series is in parallel with circuit breaker in succession, and the circuit after connecing is connected in series in the three-phase line of grid equipment.
2, limitation inrush current push-pull device according to claim 1, it is characterized in that: control device includes current sensing means, drive unit and time set, the control output end of time set is connected with two control trigger ends of drive unit respectively with the control output end of current sensing means, and a trigger end of drive unit is connected with the timing trigger end of time set.
3, limitation inrush current push-pull device according to claim 1 is characterized in that: deciliter switch is a kind of vacuum contactor, and perhaps deciliter switch is a kind of on-load switch.
4, limitation inrush current push-pull device according to claim 1 is characterized in that: circuit breaker is a kind of SF6 circuit breaker, and perhaps circuit breaker is a kind of vacuum circuit-breaker.
5, according to claim
Described limitation inrush current push-pull device is characterized in that: included current sensing means, drive unit and the time set of control device all is integrated in the control chip, and the model of this control chip is: ISD1420.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200079413U CN201113452Y (en) | 2007-08-15 | 2007-08-15 | Restricted surge switching device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200079413U CN201113452Y (en) | 2007-08-15 | 2007-08-15 | Restricted surge switching device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201113452Y true CN201113452Y (en) | 2008-09-10 |
Family
ID=39965197
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200079413U Expired - Lifetime CN201113452Y (en) | 2007-08-15 | 2007-08-15 | Restricted surge switching device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201113452Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101141067B (en) * | 2007-08-15 | 2010-09-08 | 福建省电力勘测设计院 | Limitation inrush current push-pull device |
| CN102790517A (en) * | 2011-05-17 | 2012-11-21 | 株式会社日立制作所 | Power conversion device |
| CN105871193A (en) * | 2016-06-03 | 2016-08-17 | 东莞市科旺科技股份有限公司 | PLC-based method for controlling transformer two-way soft start |
| CN109256806A (en) * | 2018-10-26 | 2019-01-22 | 中国电力科学研究院有限公司 | A kind of low based on Hybrid Real Time Simulation encourages long-term method for establishing model and system in limitation |
-
2007
- 2007-08-15 CN CNU2007200079413U patent/CN201113452Y/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101141067B (en) * | 2007-08-15 | 2010-09-08 | 福建省电力勘测设计院 | Limitation inrush current push-pull device |
| CN102790517A (en) * | 2011-05-17 | 2012-11-21 | 株式会社日立制作所 | Power conversion device |
| CN105871193A (en) * | 2016-06-03 | 2016-08-17 | 东莞市科旺科技股份有限公司 | PLC-based method for controlling transformer two-way soft start |
| CN109256806A (en) * | 2018-10-26 | 2019-01-22 | 中国电力科学研究院有限公司 | A kind of low based on Hybrid Real Time Simulation encourages long-term method for establishing model and system in limitation |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20080910 Effective date of abandoning: 20070815 |