CN2890938Y

CN2890938Y - Circuit for monitoring capacitance value of reactive compensation controller capacitor

Info

Publication number: CN2890938Y
Application number: CN 200620029807
Authority: CN
Inventors: 秦岭
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-01-13
Filing date: 2006-01-13
Publication date: 2007-04-18
Anticipated expiration: 2016-01-13

Abstract

The utility model discloses a reactive-load compensation controller capacitance holding supervision circuit which is connected between a capacitance compensator host circuit and a reactive-load compensation controller, wherein the capacitance compensator host circuit is inwardly connected with a compensation current sampling terminal, a sampling circuit collating circuit is further connected between the compensation current sampling terminal and the reactive-load compensation controller for inputting the collected current parameters after collating into a data processing unit of the reactive-load compensation controller through an A/D transformer, and a connection terminal is also equipped between the compensation current sampling terminal and the sampling current collating circuit. The utility model can supervise the real time capacitance values changes on-line to provide new grounds for the switching of the capacitor, and can realize protection of over-current and under-current of the capacitor, thereby avoiding accidents caused by electricity cutting off when detecting the capacitance and capacitor switching damage and prolonging the service life of the equipments.

Description

Non Power Compensation Controller Electric Capacity Monitor Circuit

Technical field:

The utility model relates to idle compensating control, particularly a kind of circuit that capacitor group in the idle compensating control is monitored.

Background technology:

Reactive-load compensation is as an important technology of power supply and distribution of electric power system, safety and economic operation in safeguards system, aspects such as support voltage play a part to become more and more important, existing reactive power compensation technology is the form appearance with device mostly, this reactive power compensator is generally by Reactive Power Compensation Automatic Controller, the capacitor group, capacitor switching switch and protective device constitute, come the switching of control capacitor group by the idle amount or the power factor that detect electric system, as notification number is the Chinese patent disclosed " Intelligent Reactive Compensating Controller " of CN2563809, by to power factor and the two-parameter sampling of reactive current and then control switching, and can't judge the size of the actual capacitance value of its input; Sort controller has a tangible prerequisite to the electric capacity that drops into simultaneously, and that appearance value that is exactly electric capacity is constant, and that is to say: electric capacity is in shape always.Yet in fact electric capacity changes, and this appearance value to change must be our GPRS, just to meet national requirements, otherwise the switching that external condition decision electric capacity is only arranged, and do not know the electric capacity quality, and not only inoperative sometimes, can bring the disaster of secure context on the contrary to system.In addition; overcurrent condition to reactive power compensator; controller also has no way of monitoring; can't be neatly by the overcurrent protection of controller realization to capacitor; in order to obtain the appearance value delta data of capacitor, i.e. the size of actual offset current, can only take has a power failure withdraws from the method for capacitor; will inevitably increase bigger labour intensity like this, and reduce ageing that data obtain.Moreover because controller can't carry out the setting of overcurrent protection flexibly and relevant protection parameter, its overcurrent protection only can be installed fixing overflow protecting element additional and be realized that its effect is often relatively poor by externally compensating in the major loop.

Summary of the invention:

The utility model provides a kind of Non Power Compensation Controller Electric Capacity Monitor Circuit at above deficiency exactly, by to the capacitance current collection, and the data of the voltage that provides according to original idle compensating control, calculates the actual appearance value of electric capacity.

Technical solution adopted in the utility model is:

A kind of Non Power Compensation Controller Electric Capacity Monitor Circuit that is connected between Electric capacity compensation device major loop and the idle compensating control, be connected with offset current sampling terminal in the Electric capacity compensation device major loop, also be connected with the sampling current finishing circuit between offset current sampling terminal and the idle compensating control, be used for and be input to the data processing unit of idle compensating control by A/D converter from the current parameters arrangement back of gathering.

Also be connected to connection terminal between described offset current sampling terminal and the sampling current finishing circuit.

Described offset current sampling terminal is current transformer Ta, Tb, the Tc of common end grounding.

Described sampling current finishing circuit is mainly by the mutual inductor TAa that is connected in series with current transformer Ta, diode D1, the mutual inductor TAb that is connected in series with current transformer Tb, diode D2, and the mutual inductor TAc that is connected in series with current transformer Tc, diode D3 constitute; Be connected with resistance R L1 between the intermediate contact of mutual inductor TAa and diode D1 and the ground, be connected with resistance R L2 between the intermediate contact of mutual inductor TAb and diode D2 and the ground, be connected with resistance R L3 between the intermediate contact of mutual inductor TAc and diode D3 and the ground; Capacitor C 1 that also is connected between the intermediate contact of diode D1 and idle compensating control and the ground and connects and resistance R 1, capacitor C 2 that also is connected between the intermediate contact of diode D2 and idle compensating control and the ground and connects and resistance R 2, the capacitor C 3 and the resistance R 3 that also are connected between the intermediate contact of diode D3 and idle compensating control and the ground and connect.

Described data processing unit also is connected with the alarm indication circuit.

The beneficial effect that the utility model can reach is:

1, the utility model circuit is simple, can change by the real time on-line monitoring capacitor's capacity, and can report to the police by appropriate format, has avoided because of detecting the power failure phenomenon that electric capacity causes.

2, the utility model as detected object, for the switching of capacitor provides criterion, can effectively avoid damaging the unsafe factor of capacitor switching process with capacitor's capacity, has prolonged the serviceable life of equipment.

3, the utility model can be realized overcurrent and undercurrent protection to capacitor by the real-time testing to capacitance current.

Description of drawings:

Fig. 1 is the logic block-diagram of the utility model embodiment 1.

Fig. 2 is the circuit theory diagrams of the utility model embodiment 1.

Fig. 3 is the logic block-diagram of the utility model embodiment 2.

Fig. 4 is the circuit theory diagrams of the utility model embodiment 2.

Embodiment:

The utility model will be further described below in conjunction with accompanying drawing:

As Fig. 1, Fig. 2, Fig. 3, shown in Figure 4, this Non Power Compensation Controller Electric Capacity Monitor Circuit is connected between Electric capacity compensation device major loop and the idle compensating control, advance the current transformer Ta of switch QF connection by the master in the Electric capacity compensation device major loop by common end grounding, Tb, the offset current sampling terminal that Tc constitutes, the lower end of offset current sampling terminal also is connected to a plurality of capacitor groups, current transformer Ta, Tb, Tc connects by common terminal subsample electric current finishing circuit, wherein current transformer Ta is connected in series mutual inductor TAa, diode D1, current transformer Tb serial connection mutual inductor TAb, diode D2, current transformer Tc serial connection mutual inductor TAc, diode D3; Be connected with resistance R L1 between the intermediate contact of mutual inductor TAa and diode D1 and the ground, be connected with resistance R L2 between the intermediate contact of mutual inductor TAb and diode D2 and the ground, be connected with resistance R L3 between the intermediate contact of mutual inductor TAc and diode D3 and the ground; Capacitor C 1 that also is connected between the intermediate contact of diode D1 and idle compensating control and the ground and connects and resistance R 1, capacitor C 2 that also is connected between the intermediate contact of diode D2 and idle compensating control and the ground and connects and resistance R 2, capacitor C 3 that also is connected between the intermediate contact of diode D3 and idle compensating control and the ground and connects and resistance R 3, the electric current finishing circuit is input to the current parameters arrangement back of gathering the data processing unit of idle compensating control by A/D converter, data processing unit also can be connected with the alarm indication circuit, so that the warning of appropriate format to be provided.The electric current finishing circuit can be arranged in the idle compensating control with suitable form.

During work, at first in idle compensating control, import the rated capacity of original capacitor, Electric capacity compensation device is started working, the normal switching of capacitor, at this moment, capacity current produces, Non Power Compensation Controller Electric Capacity Monitor Circuit begins monitoring, current transformer Ta, Tb, Tc becomes capacity current into the little electric current of secondary (0-5A), mutual inductor TAa in the excess current finishing circuit again, Tab, the TAc secondary diminishes, be input to the data processing unit of idle compensating control through rectifying and wave-filtering by A/D converter again, the data of the voltage that provides according to original idle compensating control are revised specified segmented current, thereby determine actual capacitor's capacity, contrast the rated capacity appearance value and actual capacitor's capacity of capacitor, determine the quality of electric capacity, and report to the police with suitable form; And the electric current of detected capacity current and idle compensating control agreement compared, thereby determine undercurrent or overcurrent, and then determine the protection action.

Claims

1, a kind of Non Power Compensation Controller Electric Capacity Monitor Circuit, be connected between Electric capacity compensation device major loop and the idle compensating control, it is characterized in that: be connected with offset current sampling terminal in the Electric capacity compensation device major loop, also be connected with the sampling current finishing circuit between offset current sampling terminal and the idle compensating control, be used for and be input to the data processing unit of idle compensating control by A/D converter from the current parameters arrangement back of gathering.

2, Non Power Compensation Controller Electric Capacity Monitor Circuit as claimed in claim 1 is characterized in that: also be connected to connection terminal between offset current sampling terminal and the sampling current finishing circuit.

3, Non Power Compensation Controller Electric Capacity Monitor Circuit as claimed in claim 1 or 2 is characterized in that: offset current sampling terminal is current transformer (Ta), (Tb), (Tc) of common end grounding.

4, Non Power Compensation Controller Electric Capacity Monitor Circuit as claimed in claim 1 or 2, it is characterized in that: the sampling current finishing circuit is mainly by the mutual inductor (TAa) that is connected in series with current transformer (Ta), diode (D1), the mutual inductor (Tab) that is connected in series with current transformer (Tb), diode (D2), the mutual inductor (TAc) that is connected in series with current transformer (Tc), diode (D3) constitute; Be connected with resistance (RL1) between the intermediate contact of mutual inductor (TAa) and diode (D1) and the ground, be connected with resistance (RL2) between the intermediate contact of mutual inductor (Tab) and diode (D2) and the ground, be connected with resistance (RL3) between the intermediate contact of mutual inductor (TAc) and diode (D3) and the ground; Electric capacity (C1) that also is connected to and connects between the intermediate contact of diode (D1) and idle compensating control and the ground and resistance (R1), electric capacity (C2) that also is connected to and connects between the intermediate contact of diode (D2) and idle compensating control and the ground and resistance (R2), electric capacity (C3) that also is connected to and connects between the intermediate contact of diode (D3) and idle compensating control and the ground and resistance (R3).

5, Non Power Compensation Controller Electric Capacity Monitor Circuit as claimed in claim 4 is characterized in that: data processing unit also is connected with the alarm indication circuit.