CN2288538Y

CN2288538Y - Autocontrolled reactive compensation relay

Info

Publication number: CN2288538Y
Application number: CN 96211932
Authority: CN
Inventors: 阎文通
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-10-28
Filing date: 1996-10-28
Publication date: 1998-08-19
Anticipated expiration: 2006-10-28

Abstract

The utility model discloses an automatically control reactive compensation relay. The utility model comprises a driver device, a rotary disk, a permanent magnet, a reed switch, and a turning circuit, wherein, the driver device is composed of a current induction coil and a voltage induction coil, the current induction coil is connected with any phase of power supply line through a current transformer, and a voltage transformer is connected with the other two phases through a transformer; the rotary disk is arranged between the coils and is connected with the permanent magnet through a decelerator; the reed switch is arranged at the position corresponding to the permanent magnet and is connected with a compensation capacitor through the logic turning circuit. The utility model has the advantages that reliable operation and high environmental temperature adaptability.

Description

The reactive power compensation relay of automatic control

The utility model is a kind of reactive power compensation relay of automatic control.

In existing power consumption equipment, the overwhelming majority is an inductive load, when capacitive load and inductive load are uneven in AC network, can cause the power factor of electrical network to descend, and influences the power supply quality of electrical network.Solution to this problem is compensation condenser to be set to reach the purpose of balanced power factor in electrical network at present.Because input load is a change at random in the electrical network, be difficult to by manually monitoring at any time and compensate, so, be extensive use of the automatic switching device input now or cut out building-out capacitor, keep the dynamic equilibrium of power factor of electric network.Existing building-out capacitor automatic switching device all is an electronic type, mainly constitute by electronic measurement circuit and relay executive circuit, general nominal operation ambient temperature is+40 ℃--10 ℃, such index obviously can not adapt to the bigger natural environment of difference variation of China, thereby can only be operated in indoorly, can obviously increase the maintenance cost of electrical network like this.In addition, existing various automatic switching devices mostly have job insecurity, accident-prone shortcoming.

The purpose of this utility model is to provide a kind of reactive power compensation relay of automatic control, to improve the adaptive capacity to environment of building-out capacitor automatic switching device.

The technical scheme that the utility model adopted is: described reactive power compensation automatic control relay mainly is made of driving element, rotating disk, permanent magnet, tongue tube and reverse circuit.Wherein driving element is identical with driving element in the existing kilowatt-hour meter, it is made of voltage induced coil and induction by current coil, connect by arbitrary power line mutually in current transformer and the three-phase power line at the induction by current coil described in the utility model, described voltage transformer is by two being connected in addition in a transformer and the three phase mains, described rotating disk is located between above-mentioned induction by current coil and the voltage induced coil, this rotating disk is connected with described permanent magnet by a deceleration device, described tongue tube is located at and this permanent magnet corresponding position, and this tongue tube is connected with the corresponding compensation capacitor by a logic reverse circuit.

Above-mentioned operation principle is: when too much presenting perceptually when idle because of inductive load in the electrical network, because current vector lags behind voltage vector, just change so described driving element can drive rotating disk.Can drive described permanent magnet by deceleration device just changes, and when the described tongue tube of permanent magnet operation process place, promptly can trigger tongue tube, makes described reverse circuit upset, and the compensating circuit that is connected this reverse circuit other end is put in the electrical network.When presenting capacitive reactive power because of overcompensate in the electrical network, because this moment, current vector was ahead of voltage vector, so described driving element can drive the rotating disk counter-rotating, and by the counter-rotating of deceleration device drive permanent magnet, this permanent magnet is returned, and in return course, pass through above-mentioned tongue tube place once more, trigger this tongue tube once more, described reverse circuit is overturn once more and reset, thereby cut away the last compensation condenser that is dropped into.Through said process, promptly can realize the automatic switching of building-out capacitor.

Advantage of the present utility model is simple in structure, reliable operation, and dependency structure, technology are very ripe, and is easy to implement, and its ambient temperature adaptive capacity can be brought up to the level suitable with existing kilowatt-hour meter.

Below in conjunction with drawings and Examples the utility model is further described.

Fig. 1, the utility model structural representation.

Fig. 2, the utility model circuit diagram.

The circuit diagram of institute's employing tumbler switch in Fig. 3, the present embodiment.

Embodiment: the structure of the reactive power compensation relay of the described automatic control of this example as shown in Figure 1, 2, for improving actuating force, used three set drive spares in this example, each driving element is the driving element in the existing kilowatt-hour meter, and described three set drive spares are respectively by voltage induced coil L _V1, L _V2, L _V3With induction by current coil L _I1, L _I2, L _I3Form, wherein voltage induced coil L _V1, L _V2, L _V3Pass through measuring transformer B respectively ₁, B ₂, B ₃Be connected with the BC two-phase in the three-phase power line, use in this example three independently measuring transformer respectively to each voltage induced coil L _V1, L _V2, L _V3Power supply, be since single underpower of the transformer that this example adopted to drive the reactive power compensation relay of the described automatic control of this example.Above-mentioned three groups of induction by current coil L _I1, L _I2, L _I3Be connected on the output of current transformer L, this current transformer L is located at A phase power line place.Correspondingly, adopt 2 interlocks of two rotating disks in this example, connect with rotating shaft 3 between this two rotating disk 2, rotating shaft 3 is connected with the input of decelerator 4, the output of decelerator 4 is provided with a permanent magnet 5, and be provided with three tongue tubes 6 around the output of this decelerator 4, every tongue tube 6 is corresponding with three groups of compensation condenser C by reverse circuit 7 respectively.The trigger end of this routine described reverse circuit 7 is connected with corresponding tongue tube 6, and the output of reverse circuit 7 is provided with a relay, and the contact switch JK1 of this relay is connected on the side of corresponding compensation capacitor C, variable resistor R in this example _wWith voltage induced coil L _V3Series connection is regulated this sensitivity of the reactive power compensation relay of control automatically by it.Owing to used three groups of building-out capacitors and three cover interlock circuits in this example, thereby can realize the function of automatically dividing three grades to carry out power back-off.

This routine described tumbler switch circuit as shown in Figure 3, this circuit comprises a relay J, the control end of this relay L and resistance R 1, resistance R 5, diode V3 and normal open switch JK-1 are connected between the both positive and negative polarity of power supply.Thyristor V5 one end is connected between resistance R 1 and the resistance R 5, the other end is connected with power cathode by the normal open switch JK-1 of resistance R 4 and relay J, should also be connected with the control end of thyristor V5 by end simultaneously by resistance R 3, the control end of this thyristor V5 connects the negative pole of diode V1, and the positive pole of this diode V1 is connected with power cathode by described tongue tube 6.Resistance R 3 is connected with the positive pole of diode V2 with node between the resistance R 4, and the negative pole of this diode V2 connects power cathodes by tongue tube 6.Diode V4 is connected in parallel on the resistance R 4.One end of resistance R 2 is connected the node place between resistance R 1 and the resistance R 5, and the other end of this resistance R 2 is connected with power cathode by tongue tube 6.

The course of work of this circuit is: when control switch is that tongue tube 6 is when connecting first, constitute the loop by resistance R 1, R5, diode V3, relay J diode V4, V2 and tongue tube 6, relay J is powered on, the normal open switch JK-1 of this relay J connects, the corresponding compensation capacitor is dropped into, and make relay J keep power-up state, make simultaneously and constitute the loop conducting by resistance R 1, R2, diode V1, resistance R 3, R4 and switch JK-1, so the voltage on the resistance R 3 acts on the control end of thyristor V5, make this thyristor keep conducting.When tongue tube 6 is connected once more, because thyristor V5 conducting, power supply constitutes the loop through resistance R 1, thyristor V5, diode V2 and tongue tube 6, and relay J is descended electricity because of its place loop voltage, and normal open switch JK-1 disconnects the corresponding compensation capacitor is cut away.

Claims

1, a kind of reactive power compensation relay of automatic control, it is characterized in that it is by driving element, rotating disk (2), permanent magnet (5), tongue tube (6) and reverse circuit (7) constitute, wherein driving element is made of voltage induced coil (Lv) and induction by current coil (Li), wherein induction by current coil (Li) is by arbitrary connection of power line mutually in current transformer (L) and the three-phase power line, described voltage transformer (Lv) is by two being connected in addition in transformer (B) and the three phase mains, described rotating disk (2) is located between above-mentioned induction by current coil (Li) and the voltage induced coil (Lv), this rotating disk (2) is connected with described permanent magnet (5) by a deceleration device (4), described tongue tube (6) is located at and this permanent magnet (5) corresponding position, and this tongue tube (6) is connected with corresponding compensation capacitor (C) by a logic reverse circuit (7).

2, the reactive power compensation relay of automatic control as claimed in claim 1 it is characterized in that described rotating disk (2) is fixed with rotating shaft (3), and this rotating shaft (3) is connected with the input of deceleration device.

3, the reactive power compensation relay of automatic control as claimed in claim 2 is characterized in that it comprises two rotating disks (2), connects with rotating shaft (3) between this two rotating disk (2), and rotating shaft (3) is connected with the input of decelerator (4).

4, the reactive power compensation relay of automatic control as claimed in claim 1 is characterized in that it comprises three set drive spares, respectively by voltage induced coil (Lv1, L _V2, L _V3) and induction by current coil (L _I1, L _I2, L _I3) composition, wherein voltage induced coil (L _V1, L _V2, L _V3) pass through measuring transformer (B respectively ₁, B ₂, B ₃) be connected induction by current coil (L with B, C two-phase in the three-phase power line _I1, L _I2, L _I3) be connected on the output of current transformer (L), this current transformer (L) is located on the A phase power line.

5, the reactive power compensation relay of automatic control as claimed in claim 1, it is characterized in that, described tumbler switch circuit comprises a relay J, the control end of this relay L and resistance R 1, resistance R 5, diode V3 and normal open switch JK-1 are connected between the both positive and negative polarity of power supply, thyristor V5 one end is connected between resistance R 1 and the resistance R 5, the normal open switch JK-1 of the other end by resistance R 4 and relay J with.Power cathode connects, should also be connected with the control end of thyristor V5 by end simultaneously by resistance R 3, the control end of this thyristor V5 connects the negative pole of diode V1, the positive pole of this diode V1 is connected with power cathode by described tongue tube 6, resistance R 3 is connected with the positive pole of diode V2 with node between the resistance R 4, the negative pole of this diode V2 connects power cathode by tongue tube 6, and diode V4 is connected in parallel on the resistance R 4.One end of resistance R 2 is connected the node place between resistance R 1 and the resistance R 5, and the other end of this resistance R 2 is connected with power cathode by tongue tube 6.