The utility model content
The utility model is at the problems referred to above, the forward and reverse Reactive Power Automatic Regulating device of a kind of transformer substation voltage is proposed, the capacitor of this device, reactor grouping switching are for one-time fixing input, the terminal voltage that changes capacitor and reactor by voltage regulator reaches the purpose that changes compensation capacity, switch inductive reactive power compensation branch road and capacitive reactive power compensation branch road by the single-pole double throw isolating switch, solved overvoltage in traditional switching, technical problem such as shove, changing lags behind is adjusted to timely adjustment, can reduce line loss significantly, improve power factor, the conservation of power energy.
The purpose of this utility model is achieved through the following technical solutions: the forward and reverse reactive-load adjusting device of a kind of transformer substation voltage, mainly comprise: microcomputerized controller, voltage transformer, current transformer, control box, on-load tap-changing transformer, voltage regulator, capacitor, it is characterized in that: on-load tap-changing transformer is connected between distribution input high voltage bus and the user's low-voltage bus bar, voltage transformer A summation current transformer is connected on the simple bus of described on-load tap-changing transformer, voltage transformer B and voltage regulator are connected on the secondary bus of described on-load tap-changing transformer, the detection signal output of described voltage transformer A and voltage transformer B and current transformer is connected with the input of described microcomputerized controller respectively, the signal output part of microcomputerized controller respectively with control box A, control box B connects, and control box A realizes operation to the on-load tap-changing transformer shunting switch by the control signal of controller; Control box B realizes control to the voltage regulator shunting switch by the signal of controller; Described voltage regulator output is connected with a diverter switch, and this diverter switch is switched between capacitive compensation branch road and perception compensation branch road, and series reactor and capacitor are formed the capacitive compensation branch road, and shunt reactor is formed perception compensation branch road.
Transforming plant voltage reactive adjusting device of the present utility model is according to formula Q=2 π FCU
2And Q=U
2The principle of/2 π FL, i.e. the relation that capacitive compensation branch road and the output of perception compensation branch road is directly proportional with voltage changes idle output variable by the terminal voltage that changes each branch road.When transforming plant voltage reactive automatic regulating equipment of the present utility model moves, voltage detecting instrument transformer and current detecting instrument transformer send the voltage and current signal on the detected bus to microcomputerized controller, microcomputerized controller is by the working procedure of inner setting, analyze and judge according to the requirement of voltage of setting and power factor, and then send control command.Control its switch is switched capacitive compensation branch road or perception compensation branch road, and passes through the shunting switch of control box B control voltage regulator, changes the terminal voltage of described compensation branch road.As cos Φ (power factor) when being lower than requirement, microcomputerized controller sends the instruction of the compensation wire-end voltage that raises and gives control box B; The terminal voltage of compensation branch road is raise, improve idle output, thereby improve cos Φ; When cos Φ was higher than requirement, microcomputerized controller then sent the instruction that reduces a compensation wire-end voltage, reduces idle output, thereby reduced cos Φ, and the system power factor is remained in the scope of setting.
When the system voltage lifting makes busbar voltage defective, voltage transformer a-signal input microcomputerized controller, microcomputerized controller computing by analysis send instruction to control box A, finish the action of the tap changer of on-load tap-changing transformer by control box A, adjust its output voltage, guarantee that voltage is qualified.
The utlity model has following advantage:
(1) owing to having adopted microcomputerized controller, can be according to the idle parameter of system voltage, the guaranteed output factor is in being provided with scope, and the best, the line loss minimum.
(2) capacitor is fixing inserts, and it is idle not adopt the switching capacitance mode to regulate, but according to Q=2 π FCU
2Change the capacitor terminal voltage and regulate idle exerting oneself, satisfy system's load or burden without work requirement.
(3) reactor is fixing inserts, and it is idle not adopt the grouping switching reactor to regulate, but according to Q=U
2/ 2 π FL change the reactor terminal voltage and regulate idle exerting oneself, and satisfy system's load or burden without work requirement.
(4) because pressure regulation process capacitor or reactor do not break away from electrical network all the time, therefore no charge and discharge phenomena does not have the time-delay of adjusting, can realize timely adjustment.And do not have overvoltage and shoving in the pressure regulation process, and make system safer, prolong its useful life
(5) can adopt capacitor or reactor low-voltage to close a floodgate, effectively reduce of the impact of capacitor inrush phenomenon system.
(6) in equipment running process,, controller allow system voltage operate in the acceptability limit thereby carrying out Comprehensive Control to capacitance switch, electronic disconnecting link, voltage power-less adjuster according to change in voltage in good time.
Embodiment
Below in conjunction with drawings and Examples the utility model is described further: embodiment: with reference to accompanying drawing, the forward and reverse reactive-load adjusting device of a kind of transformer substation voltage, mainly comprise: microcomputerized controller, voltage transformer, current transformer, control box, on-load tap-changing transformer, voltage regulator, capacitor, on-load tap-changing transformer 8 is connected between distribution input high voltage bus 5 and the user's low-voltage bus bar 4, this bus is three-phase, voltage transformer A2 summation current transformer 7 is connected on the simple bus of described on-load tap-changing transformer, voltage transformer B3 and voltage regulator 10 are connected on the secondary bus of described on-load tap-changing transformer, the detection signal output of voltage transformer A and voltage transformer B and current transformer is connected with the input of described microcomputerized controller respectively, the signal output part of microcomputerized controller 1 is connected with control box B9 with control box A6 respectively, control box A connects the control on-load tap-changing transformer, control box B connects the control voltage regulator, described voltage regulator output is connected with diverter switch 11, diverter switch of the present utility model is the single-pole double throw isolation switch, this single-pole double throw isolation switch is connected to capacitive compensation branch road and perception compensation branch road, and series reactor L1 and capacitor C form capacitive compensation branch road 12; Shunt reactor L2 forms perception compensation branch road 13.The product of present embodiment has passed through the check at the complete control device quality testing of Ministry of Power Industry's reactive power compensation center.