CN2604809Y - Intelligent low-voltage reactive compensation equipment - Google Patents
Intelligent low-voltage reactive compensation equipment Download PDFInfo
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- CN2604809Y CN2604809Y CN 03233221 CN03233221U CN2604809Y CN 2604809 Y CN2604809 Y CN 2604809Y CN 03233221 CN03233221 CN 03233221 CN 03233221 U CN03233221 U CN 03233221U CN 2604809 Y CN2604809 Y CN 2604809Y
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- reactive power
- energy meter
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Abstract
The utility model relates to an intelligent low pressure reactive power compensation apparatus includes a reactive power compensation controller (1) and a distribution transformer monitoring energy meter (2), is characterized in that: at least one capacitor module composed by an air switch (12), an AC contactor (13), and a capacitor (14), wherein the output signal of the controller is connected with the controlling loop of the contact coil in the capacitor module; the switch output of the distribution transformer monitoring energy meter is connected with the auxiliary contact pin of the AC contactor; power supply of the apparatus is transmitted to the bus of the apparatus by a current transformer through the low pressure side of a distribution transformer; the bus is parallelly connected with a lightning arrester (9) which distributes the power supply to the distribution transformer monitoring energy meter, the reactive power compensation controller, and the capacitor modules. Combining the functions of reactive power compensation, distribution transformer monitoring, and electric energy measurement, the apparatus can record the input switch quantity and give timely alarm of short circuit fault of the capacitor, and thus wiring meter reading or wireless meter reading by far infrared communication interfaces can be realized.
Description
Affiliated technical field
The utility model is a kind of power electronic equipment that the electric power system low-voltage distribution network is carried out reactive power compensation.
Background technology
Along with the rapid growth of a large amount of inductive loads, the quality of power supply variation of electric power system low-voltage distribution network, voltage landing and power loss on the circuit increase, and have not only influenced user's ordinary production, life, return power department and cause economic loss.Low-voltage distribution network is carried out reactive power compensation can well be overcome the above problems, and effectively improves quality of voltage and reduces line loss.
But there are many deficiencies in the conventional low reactive power compensator that generally adopts in the electric power system at present, shows the following aspects:
1, function singleness.Has only no-power compensation function, can not monitor the operating state of transformer, the function that does not possess electric energy metrical, cause existing reactive power compensation case on the distribution transforming bar, electric energy metering box is arranged again, have in addition also have the distribution transformer monitoring case, neither attractive in appearance, uneconomical again, bring difficulty also for simultaneously work such as electric energy meter copy reading, maintenance.
2, not with voltage as primary controlled quentity controlled variable.The conventional low reactive power compensator often with power factor, reactive power and reactive current as controlled quentity controlled variable, and ignored control to voltage, therefore voltage phenomenon higher or on the low side appears unavoidably, influence month user's normal electricity consumption.
3, can not write down the switching situation of capacitor group, also not have communication function simultaneously, therefore make power department be difficult to grasp the operation conditions of low-voltage reactive compensator capable.
4, there is not warning function.Capacitor in low-voltage reactive compensator capable breaks down, and in the time of can't coming into operation, can not in time notify power department to keep in repair, and has reduced the compensation effect of device.
Summary of the invention
Technical problem to be solved in the utility model is to overcome conventional low reactive power compensator above shortcomings, and a kind of intelligent low-pressure reactive power compensator is provided.
The technical solution adopted in the utility model is such, and promptly a kind of intelligent low-pressure reactive power compensator comprises idle compensating control (1), distribution transformer monitoring electric energy meter (2), lightning arrester (9); It is characterized in that: also comprise the capacitor module that at least one is made of air switch (12), A.C. contactor (13) and capacitor (14); The output signal of its middle controller connects the control loop of A.C. contactor contact coil in the capacitor module, and the switch value input interface on the distribution transformer monitoring electric energy meter is connected with the auxiliary contact of A.C. contactor; The power supply of device is guided to bus in the device by the low-pressure side of distribution transformer through current transformer, and in parallel lightning arrester (9) give distribution transformer monitoring electric energy meter, idle compensating control and each capacitor module (10) by bus with power distribution then on the bus.
Characteristics of the present utility model are:
1. concentrated idle compensating control and distribution transformer monitoring electric energy meter in the device, made this device integrate reactive power compensation, distribution transformer monitoring, electric energy metrical function.
2. the control mode that designs in the idle compensating control is at first to carry out reactive power compensation by voltage swing, comes the switching of control capacitor group after voltage is qualified again according to power factor.
3. it is many to give full play to distribution transformer monitoring electric energy meter function, the advantage that memory capacity is big, the operational factor of monitoring, metering low-voltage distribution network.As: metered voltage deviation ratio, rate of qualified voltage, current imbalance rate; Record load operation parameter is also drawn load curve; The time of record each phase maximum voltage every day, minimum voltage, maximum power factor and appearance; Record powers on, overvoltage, under-voltage, beginning and ending time that incident takes place such as current imbalance transfinites.
4. utilize the distribution transformer monitoring electric energy meter can write down the function of input switch amount, the line voltage when noting capacitor group switching, power factor and switching time.
5. in installing, designed the display alarm function, can alarm indication in time after capacitor is short-circuited fault.
If the device box bottom design RS485 serial line interface jack, the RS485 serial ports of distribution transformer monitoring electric energy meter is linked to each other with computer, read the various data that write down in the electric energy meter by wired meter reading method.
7. can utilize the far infrared communication interface of distribution transformer monitoring electric energy meter to realize the radio meter register function.
Description of drawings
Below in conjunction with accompanying drawing the utility model is further specified.
Accompanying drawing 1 is a structural principle schematic diagram of the present utility model.
Accompanying drawing 2 is capacitor module structure principle charts.
Accompanying drawing 3 is display alarm circuit theory figure.
Figure number 1--controller wherein, 2--distribution transformer monitoring electric energy meter, 3--far infrared communication interface, the 4--switch value input interface, 5--controller earth terminal, 6--controller 5V power end, 7--RS485 serial line interface jack, the 8--fuse, the 9--lightning arrester, the 10--capacitor module, the 11--alarm lamp, the 12--air switch, 13--switch capacitor A.C. contactor, the 14--capacitor, the 15--contactor coil, the 16--main noddle on contactor, the 17--air switch is assisted normally closed interlock, 18--contactor current-limiting resistance, 19--contactor transition contact, the 20--fuse.
Embodiment
Idle compensating control among the embodiment (1), distribution transformer monitoring electric energy meter (2), air switch (12), A.C. contactor (13), capacitor (14), lightning arrester (9), fuse (8) and (20), RS485 serial line interface jack (7), alarm lamp compositions such as (11).The structure of each capacitor module (10) is the same, can be equipped with the capacitor module of right quantity in casing as required.Wherein, the power supply of device is guided to bus in the device by the low-pressure side of distribution transformer through current transformer; lightning arrester connected in parallel on the bus (9); give distribution transformer monitoring electric energy meter, idle compensating control and each capacitor module (10) by bus with power distribution then, lightning arrester is as Lightning Over-voltage and switching overvoltage protection component.
Referring to accompanying drawing 2, capacitor module is made up of air switch (12), switch capacitor A.C. contactor (13) and capacitor (14); Wherein contactor (13) is connected with bus with capacitor (14) series connection after air switch.Closure when air switch normally moves is by the switching of contactor control capacitor.Contactor is made up of coil (15), main contact (16), current-limiting resistance (18) and transition contact (19), and controller (1) output signal is through overcurrent fuse A (8) control contactor coil electricity and outage.Behind the coil electricity, at first drive the transition contact closure, surge current flows through capacitor through current-limiting resistance, transition contact, and shove and just suppressed by current-limiting resistance, main contact moment closure then, transition contact disconnects, and capacitor is put in the electrical network through main contact.
The input signal termination step down side electrical network three-phase voltage of distribution transformer monitoring electric energy meter (2) and the load secondary current output after the current transformer conversion.Can measure the multiple operational factor of electrical network, for electric industry department provides the distribution service data.
The input signal termination step down side electrical network single-phase voltage of idle compensating control (1) and load secondary current output.Because the input impedance of controller current sample end is less than 0.05 Ω, so current sampling signal directly takes out from the current sampling circuit of distribution transformer monitoring electric energy meter.The sampled voltage of controller, electric current input microprocessor after conversion loop, A/D sampling, microprocessor computing, deal with data, obtain line voltage and power factor, judge then whether voltage is qualified, promptly whether in voltage switching threshold value scope: drop into threshold value if voltage is lower than voltage, then delay time and export control signal after a period of time, make the ac contactor coil energising, drop into a group capacitor; Threshold value is then exported control signal rapidly if voltage is higher than the voltage excision, makes the ac contactor coil outage, excises a group capacitor.When voltage is qualified, then judge power factor: when dropping into threshold value, drop into a group capacitor after a period of time of just delaying time less than power factor; When power factor is leading, excision one group capacitor after a period of time of then delaying time; When power factor is in power factor switching threshold value scope, then keep the running status of this moment.When controller was measured little electric current that the load secondary current is less than or equal to setting and dropped into the locking value, controller no longer made the capacitor input, and the output control signal, and the capacitor group that dropped into of excision rapidly is to prevent capacitor vibration switching.When the vibration switching took place the capacitor group, controller can increase the switching delay time automatically, to reduce the frequent degree of switching.In the present embodiment, described controller (1) adopts the JKG e intelligent reactive power automatic compensation controller that Huaneng Group, Chongqing power electronic technology research institute produces.The model that described distribution transformer monitoring electric energy meter (2) adopts Hunan Weisheng Electronics Co.,Ltd to produce is the multi-functional three-phase alternating current electric energy of DTSD341 (3J type) full electronic table.
As shown in Figure 3, the capacitor short-circuit fault adopted alarm circuit in the present embodiment for ease of in time finding.This alarm circuit draws single phase poaer supply from bus, behind fuse (20), connects the auxiliary normally closed interlock (17) of the quantity in parallel air switch corresponding with air switch quantity, the alarm lamp (11) of connecting again.When capacitor normally moves, the air switch closure, its auxiliary normally closed interlock is opened, and indicator light does not work, in case any group capacitor is short-circuited, air switch meeting automatic disconnection, its auxiliary normally closed interlock just can be closed, connect the display alarm loop, indicator light is shinny, reports to the police.
The utility model utilizes the switch value input interface on the distribution transformer monitoring electric energy meter and the auxiliary contact of A.C. contactor to be connected, and has realized the function of record capacitor group switching situation, and whether being convenient to electric industry department, to understand the operation of reactive power compensator normal.
In the present embodiment, the device box bottom design RS485 serial line interface jack (7), be connected with the RS485 serial ports of distribution transformer monitoring electric energy meter, can realize linking to each other with computer, read the various data that write down in the electric energy meter by wired meter reading method.
Claims (6)
1, a kind of intelligent low-pressure reactive power compensator comprises idle compensating control (1), distribution transformer monitoring electric energy meter (2); It is characterized in that: also comprise the capacitor module that at least one is made of air switch (12), A.C. contactor (13) and capacitor (14); The output signal of its middle controller connects the control loop of A.C. contactor contact coil in the capacitor module, and the switch value input interface on the distribution transformer monitoring electric energy meter is connected with the auxiliary contact of A.C. contactor; The power supply of device is guided to bus in the device by the low-pressure side of distribution transformer through current transformer, and in parallel lightning arrester (9) give distribution transformer monitoring electric energy meter, idle compensating control and each capacitor module (10) by bus with power distribution then on the bus.
2, intelligent low-pressure reactive power compensator according to claim 1 is characterized in that: capacitor module is made up of air switch (12), switch capacitor A.C. contactor (13) and capacitor (14); Wherein contactor (13) is connected with bus with capacitor (14) series connection after air switch; Contactor is made up of coil (15), main contact (16), current-limiting resistance (18) and transition contact (19); Controller (1) output signal is through overcurrent fuse (8) control contactor coil electricity and outage.
3, intelligent low-pressure reactive power compensator according to claim 1 is characterized in that: the input signal termination step down side electrical network three-phase voltage of distribution transformer monitoring electric energy meter (2) and the load secondary current output after the current transformer conversion.
4, intelligent low-pressure reactive power compensator according to claim 1 is characterized in that: the input signal termination step down side electrical network single-phase voltage of idle compensating control (1) and load secondary current output.
5, intelligent low-pressure reactive power compensator according to claim 1, it is characterized in that: by the single phase poaer supply of drawing on the bus, behind fuse (20), connect the auxiliary normally closed interlock (17) of the quantity in parallel air switch corresponding with air switch quantity, the alarm lamp (11) of connecting again constitutes alarm circuit.
6, intelligent low-pressure reactive power compensator according to claim 1 is characterized in that: the device box bottom has RS485 serial line interface jack (7), is connected with the RS485 serial ports of distribution transformer monitoring electric energy meter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03233221 CN2604809Y (en) | 2003-02-17 | 2003-02-17 | Intelligent low-voltage reactive compensation equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03233221 CN2604809Y (en) | 2003-02-17 | 2003-02-17 | Intelligent low-voltage reactive compensation equipment |
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| Publication Number | Publication Date |
|---|---|
| CN2604809Y true CN2604809Y (en) | 2004-02-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03233221 Expired - Lifetime CN2604809Y (en) | 2003-02-17 | 2003-02-17 | Intelligent low-voltage reactive compensation equipment |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102946108A (en) * | 2012-11-21 | 2013-02-27 | 保定供电公司 | Voltage automatic compensation device |
| CN110571819A (en) * | 2019-09-12 | 2019-12-13 | 宁波市电力设计院有限公司 | novel distribution network voltage regulator device |
| CN110768373A (en) * | 2019-09-24 | 2020-02-07 | 国网山东省电力公司莱芜供电公司 | Intelligent distribution transformer monitoring system for high overload distribution transformer |
| CN113589044A (en) * | 2021-07-27 | 2021-11-02 | 国网江苏省电力有限公司电力科学研究院 | Automatic signal switching device for primary and secondary fusion detection equipment |
-
2003
- 2003-02-17 CN CN 03233221 patent/CN2604809Y/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102946108A (en) * | 2012-11-21 | 2013-02-27 | 保定供电公司 | Voltage automatic compensation device |
| CN110571819A (en) * | 2019-09-12 | 2019-12-13 | 宁波市电力设计院有限公司 | novel distribution network voltage regulator device |
| CN110768373A (en) * | 2019-09-24 | 2020-02-07 | 国网山东省电力公司莱芜供电公司 | Intelligent distribution transformer monitoring system for high overload distribution transformer |
| CN113589044A (en) * | 2021-07-27 | 2021-11-02 | 国网江苏省电力有限公司电力科学研究院 | Automatic signal switching device for primary and secondary fusion detection equipment |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20130217 Granted publication date: 20040225 |