CN204928124U

CN204928124U - Distribution network terminal with power compensation

Info

Publication number: CN204928124U
Application number: CN201520600723.5U
Authority: CN
Inventors: 王燕祥; 杨光彦; 沈国富; 钟东; 周骏; 史衍绪; 宣磊; 肖大林; 代洪芝; 韩建超
Original assignee: Kunming Power Supply Bureau of Yunnan Power Grid Co Ltd
Current assignee: Kunming Power Supply Bureau of Yunnan Power Grid Co Ltd
Priority date: 2015-08-11
Filing date: 2015-08-11
Publication date: 2015-12-30
Anticipated expiration: 2025-08-11

Abstract

The utility model discloses a distribution network terminal with power compensation, current transformer and voltage transformer be connected with AD switching circuit module, AD switching circuit module is connected with the singlechip, main circuit module pass through the pulse trigger circuit and be connected with the singlechip, display module, keyboard connect on the singlechip. The utility model discloses a design improve electric power system voltage quality, the defeated substation equipment's of full play efficiency reduces power loss, guarantees the operation of electric wire netting safety economy.

Description

A kind of power distribution network terminal with power back-off

Technical field

The utility model relates to a kind of power distribution network terminal with power back-off, belongs to distribution network technology field.

Background technology

In factories and miness electricity consumption enterprise, equipment mainly motor, solenoid, the transformer etc. of electricity consumption, these load inductance amounts are very large, cause supply line's power factor not high, and electric current electric energy line loss is large, and economic effect is low, waste electric energy.Improve safety operation level and the quality of power supply of electrical network, except electric network composition itself is wanted rationally, also must have advanced regulable control means, the safe operation of electrical network, economical operation are depended on its " degree of controllability " to a great extent.Meritorious or the reactive power compensation that shunt compensation provides can play irreplaceable important use of doing in enhancing electric power system female total stability side, and therefore from the birth of electric power system, shunt compensation technology just starts constantly to occur in electric power system.

The design of existing power distribution network terminal power compensating system is unreasonable, and circuit structure is complicated, auto-control and intelligence degree low, maintenance and repair is very inconvenient.

Utility model content

The utility model proposes a kind of power distribution network terminal with power back-off, the design of employing improves power system voltage quality, gives full play to the usefulness of power regulation station equipment, reduces power loss, ensures the operation of power grid security economy.

A kind of power distribution network terminal with power back-off of the present utility model, comprising: current transformer, voltage transformer, A/D change-over circuit module, main circuit module, single-chip microcomputer, display module, keyboard, pulsed triggering circuit, described current transformer and voltage transformer and A/D change-over circuit model calling, A/D change-over circuit module is connected with single-chip microcomputer, and described main circuit module is connected with single-chip microcomputer by pulsed triggering circuit, described display module, keyboard is connected on single-chip microcomputer, described single-chip microcomputer adopts 80C196KB chip, described current transformer is SPT205B current transformer, voltage transformer is SPT204A voltage transformer, described A/D change-over circuit module adopts MAX197 conversion chip, described keyboard adopts the I/O of 80C196KB chip as input, display module adopts LCD display, described keyboard adopts the I/O of 80C196KB chip as input, display module adopts LCD display, and described main circuit module is by thyristor T1, T2, T3......T6 and diode D1, D2, D3......D6 and electric capacity C1, C2, C3....C6 forms.

Further, thyristor T1, T2, T3......T6 and diode D1, D2, D3......D6 are connected with electrical network bus A, B, C respectively, thyristor T1, T2, T3......T6 and diode D1, D2, D3......D6 are connected in parallel, the magnitude of voltage that electrical network bus records, current value, through A/D change-over circuit module, analog quantity is converted to digital quantity, then is connected with single-chip microcomputer.

Further, in described voltage transformer internal circuit, current-limiting resistance Ri is provided with at input, in described current transformer internal circuit, input: the electric current of output is 3:1, specified input current is 3mA, specified output is 1mA, voltage transformer circuit summation current transformer main circuit is by A, B, the each phase voltage of C, each line current converts-10V to---and the ac voltage signal of+10V is sent into A/D change-over circuit and is carried out AC sampling and conversion, no matter neck determines input voltage has much, the value of adjustment, R1<5, the value of input current is made to be 2mA, then another side also can respond to the identical electric current 2mA of output one, regulating resistance R and w can obtain required output voltage, r and C is regulated to be used for compensating phase shift.

Further, in described A/D change-over circuit inside modules circuit, the CLK pin of MAX197 conversion chip be connected a 100pf electric capacity between ground, the CH0-CH3 of MAX197 conversion chip is connected with current transformer and voltage transformer, and D0-D7 is connected with single-chip microcomputer pin.

The beneficial effects of the utility model are: the design that the utility model adopts improves power system voltage quality, gives full play to the usefulness of power regulation station equipment, reduce power loss, ensure the operation of power grid security economy.

Accompanying drawing explanation

For ease of illustrating, the utility model is described in detail by following concrete enforcement and accompanying drawing;

Fig. 1 is structured flowchart of the present utility model;

Fig. 2 is main circuit module circuit diagram;

Fig. 3 is voltage transformer internal circuit diagram;

Fig. 4 is current transformer internal circuit diagram;

Fig. 5 is A/D change-over circuit inside modules circuit diagram.

Embodiment

For making the purpose of this utility model, technical scheme and advantage clearly understand, below by the specific embodiment shown in accompanying drawing, the utility model is described.But should be appreciated that, these describe just exemplary, and do not really want to limit scope of the present utility model.In addition, in the following description, the description to known features and technology is eliminated, to avoid unnecessarily obscuring concept of the present utility model.

As Fig. 1, 2, 3, 4, shown in 5, a kind of power distribution network terminal with power back-off, comprising: current transformer, voltage transformer, A/D change-over circuit module, main circuit module, single-chip microcomputer, display module, keyboard, pulsed triggering circuit, described current transformer and voltage transformer and A/D change-over circuit model calling, A/D change-over circuit module is connected with single-chip microcomputer, and described main circuit module is connected with single-chip microcomputer by pulsed triggering circuit, described display module, keyboard is connected on single-chip microcomputer, described single-chip microcomputer adopts 80C196KB chip, described current transformer is SPT205B current transformer, voltage transformer is SPT204A voltage transformer, described A/D change-over circuit module adopts MAX197 conversion chip, described keyboard adopts the I/O of 80C196KB chip as input, display module adopts LCD display, described keyboard adopts the I/O of 80C196KB chip as input, display module adopts LCD display, and described main circuit module is by thyristor T1, T2, T3......T6 and diode D1, D2, D3......D6 and electric capacity C1, C2, C3....C6 forms.

Particularly, as shown in Figure 2, in described main circuit module, A, B, C is electrical network bus, T1, T2, T3......T6 is thyristor, D1, D2, D3......D6 is diode, thyristor T1, T2, T3......T6 and diode D1, D2, D3......D6 respectively with electrical network bus A, B, C connects, thyristor T1, T2, T3......T6 and diode D1, D2, D3......D6 is connected in parallel, the magnitude of voltage that described electrical network bus records, current value, is converted to digital quantity through A/D change-over circuit module by analog quantity, then is connected with single-chip microcomputer, as shown in Figure 3 and Figure 4, in described voltage transformer internal circuit, the Ri of input is current-limiting resistance, in described current transformer internal circuit diagram, input: the electric current of output is 3:1, specified input current is 3mA, and specified output is 1mA, and described voltage transformer circuit summation current transformer main circuit is by A, the each phase voltage of B, C, each line current converts-10V to---and the ac voltage signal of+10V is sent into A/D change-over circuit and is carried out AC sampling and conversion, in described voltage transformer internal circuit diagram, no matter neck determines input voltage has much, the value of adjustment, R1<5, the value of input current is made to be 2mA, then another side also can respond to the identical electric current 2mA of output one, regulating resistance R and w can obtain required output voltage, r and C is regulated to be used for compensating phase shift, as shown in Figure 5, in described A/D change-over circuit inside modules circuit, an indirect 100pf electric capacity on CLK pin and ground is to arrange internal clock frequencies, and the analog signal that CH0-CH3 received current instrument transformer and voltage transformer transmit, D0-D7 is connected with single-chip microcomputer pin.

Claims

1. one kind has the power distribution network terminal of power back-off, it is characterized in that: comprise current transformer, voltage transformer, A/D change-over circuit module, main circuit module, single-chip microcomputer, display module, keyboard, pulsed triggering circuit, described current transformer and voltage transformer respectively with A/D change-over circuit model calling, A/D change-over circuit module is connected with single-chip microcomputer, described main circuit module is connected with single-chip microcomputer by pulsed triggering circuit, and described display module, keyboard are connected on single-chip microcomputer.

2. a kind of power distribution network terminal with power back-off according to claim 1, it is characterized in that: described single-chip microcomputer adopts 80C196KB chip, described current transformer is SPT205B current transformer, voltage transformer is SPT204A voltage transformer, described A/D change-over circuit module adopts MAX197 conversion chip, described keyboard adopts the I/O of 80C196KB chip as input, and display module adopts LCD display.

3. a kind of power distribution network terminal with power back-off according to claim 1, it is characterized in that: described main circuit module is made up of thyristor T1, T2, T3......T6 and diode D1, D2, D3......D6 and electric capacity C1, C2, C3....C6, thyristor T1, T2, T3......T6 and diode D1, D2, D3......D6 are connected with electrical network bus A, B, C respectively, and thyristor T1, T2, T3......T6 and diode D1, D2, D3......D6 are connected in parallel.

4. a kind of power distribution network terminal with power back-off according to claim 1, it is characterized in that: in described voltage transformer internal circuit, current-limiting resistance Ri is provided with at input, in described current transformer internal circuit, input: the electric current of output is 3:1, in described A/D change-over circuit inside modules circuit, the CLK pin of MAX197 conversion chip be connected a 100pf electric capacity between ground, CH0-CH3 pin of MAX197 conversion chip is connected with current transformer and voltage transformer, and D0-D7 pin is connected with single-chip microcomputer pin.