CN208508536U - A kind of low-voltage distribution reactive compensation control system - Google Patents

Abstract

The utility model discloses a kind of low-voltage distribution reactive compensation interlock systems, including the first transformer circuit, the second transformer circuit, pass through mother cabinet F connection between first transformer circuit and the second transformer circuit, first transformer circuit includes the first transformer, incoming line cabinet A, compensating cabinet C, load, first transformer is connected through incoming line cabinet A and load, and compensating cabinet C loads the idle of generation for compensating in the first transformer circuit；Second transformer circuit includes the second transformer, incoming line cabinet K, compensating cabinet I, load, second transformer is connected through incoming line cabinet K and load, compensating cabinet I loads the idle of generation for compensating in the second transformer circuit, setting is interlocked between incoming line cabinet A and compensating cabinet C, so that compensating cabinet C follows the unlatching of incoming line cabinet A to be closed and synchronize unlatching closure；Setting is interlocked between incoming line cabinet K and compensating cabinet I, so that compensating cabinet I is closed according to the unlatching of incoming line cabinet K and synchronizes unlatching closure.Above scheme avoids power grid overcompensation phenomenon.

Description

A kind of low-voltage distribution reactive compensation control system

Technical field

The utility model relates to low-voltage distribution system field, in particular to a kind of low-voltage distribution reactive compensation control system.

Background technique

Currently, low-voltage distribution system such as attached drawing 1, in Fig. 1, QF1 is the breaker of the first transformer incoming line cabinet A, and QF2 is The breaker of second transformer incoming line cabinet K, QF3 are the breaker of mother cabinet F, and B, J are capacitor box, and C, I are compensating cabinet SVG, and D is extremely E, G to H is load cabinet.When normal use, busbar breaker QF3 disjunction, compensating cabinet C compensation load D generated to E cabinet it is idle, Compensating cabinet I compensation load H generates idle to G cabinet, and current transformer M, current transformer N are respectively compensating cabinet C, compensating cabinet I Sampling current transformer, for acquiring current signal.The end of incoming cables of current transformer M towards QF1, current transformer N into Line end is towards QF2.When mother QF3 disjunction, compensating cabinet C, the respective load of each self compensation of compensating cabinet I.But as incoming line cabinet A or K When having a power failure, for example A has a power failure, and mother cabinet F investment, current transformer M current sample is reversed at this time, although incoming line cabinet A, Capacitor box B is without electric current, but compensating cabinet C has itself electric current (3.6A or so), and compensation is positive feedback at this time, at 5 seconds or so, It is enhanced to itself maximum current of compensating cabinet C, reactive current is seriously amplified, and is such as cut off compensating cabinet C not in time, is be easy to cause overfill It repays.Conversely, compensating cabinet I be easy to cause overcompensation when incoming line cabinet K has a power failure.If do not improved, compensation effect is seriously affected.

Utility model content

The purpose of the utility model is to overcome the deficiencies in the prior art, provide a kind of low-voltage distribution the control of reactive power compensating system System reduces the overcompensation phenomenon in low-voltage distribution system due to occurring when incoming line cabinet A or K have a power failure.

To achieve the goals above, a kind of the technical solution adopted in the utility model are as follows: low-voltage distribution reactive compensation interlocking System, including the first transformer circuit, the second transformer circuit, between first transformer circuit and the second transformer circuit By the F connection of mother cabinet, first transformer circuit includes the first transformer, incoming line cabinet A, compensating cabinet C, load, and described the One transformer is connected through incoming line cabinet A and load, and the compensating cabinet C is for compensating the nothing for loading generation in the first transformer circuit Function；Second transformer circuit includes the second transformer, incoming line cabinet K, compensating cabinet I, load, and second transformer is through inlet wire Cabinet K and load connect, and the compensating cabinet I loads the idle of generation for compensate in the second transformer circuit, the incoming line cabinet A and Setting is interlocked between compensating cabinet C, so that the compensating cabinet C follows the unlatching of incoming line cabinet A to be closed and synchronize and carry out unlatching closure；Institute It states and interlocks setting between incoming line cabinet K and compensating cabinet I, so that compensating cabinet I is closed according to the unlatching of incoming line cabinet K and synchronizes and opened Closure.

The power unit module of the compensating cabinet C passes through the first stop button TA1 and control power supply composition the first control electricity The power unit module of resource loop, the compensating cabinet I passes through the second stop button TA2 and control power supply composition the second control power supply Circuit；Setting is interlocked between incoming line cabinet A and compensating cabinet C are as follows: concatenate the normally opened auxiliary contact K1 of the circuit breaker Q F1 of incoming line cabinet A In the first control electric power loop；Setting is interlocked between incoming line cabinet K and compensating cabinet I are as follows: by the normal of the circuit breaker Q F2 of incoming line cabinet K Auxiliary contact K2 is opened to be serially connected in second source control loop.

Utility model has the advantages that the unlimited auxiliary contact of incoming line cabinet inner breaker are concatenated by interlocking setting In the power supply control circuit of compensating cabinet, to realize that compensating cabinet follows the work of corresponding incoming line cabinet and works, avoid into The power-off of line cabinet stops working and compensating cabinet works on the overcompensation of generation, guarantees the safe operation of power grid.

Detailed description of the invention

Below to each width attached drawing of the utility model specification expression content and figure in label be briefly described:

Fig. 1 is prior art low-voltage distribution system schematic diagram

Fig. 2 is the locking principle figure of the utility model compensating cabinet C and incoming line cabinet A；

Fig. 3 is the locking principle figure of the utility model compensating cabinet I and incoming line cabinet K.

Specific embodiment

Specific embodiment of the present utility model is made into one by the description to optimum embodiment below against attached drawing Step detailed description.

As shown in Figure 1, being the low-voltage network system of the prior art, including two circuits, the first transformer circuit, second Transformer circuit, the first transformer circuit include the first transformer, incoming line cabinet A, capacitor box B, compensating cabinet C, load, and load includes Load cabinet D and E, the second transformer circuit include the second transformer, incoming line cabinet K, capacitor box J, compensating cabinet I, load, and load includes Load cabinet H to load cabinet G；By mother cabinet F connection, circuit breaker Q F3 is the breaker of mother cabinet F in two circuits；First transformation Device connects load after incoming line cabinet A, capacitor box B, compensating cabinet C, and compensating cabinet C is generated for compensating to load in the first transformer circuit It is idle；Second transformer is loaded through incoming line cabinet K, capacitor box J, compensating cabinet I connection, and compensating cabinet I is for compensating the second transformer The reactive power of generation is loaded in circuit.When in order to reduce due to one of incoming line cabinet A or incoming line cabinet K power-off, mother cabinet QF3 Investment, compensating cabinet can generate overcompensation at this time, cause the electric power netting safe runnings problem such as overcompensation, in order to solve these problems, will Setting is interlocked between incoming line cabinet A and compensating cabinet C, so that the compensating cabinet C follows the unlatching of incoming line cabinet A to be closed and synchronize out Opening and closing is closed；Setting will be interlocked between incoming line cabinet K and compensating cabinet I, so that compensating cabinet I is closed according to the unlatching of incoming line cabinet K and is synchronized Carry out unlatching closure.

Interlocking setting uses electric interlock mode, and the normally opened auxiliary contact of incoming line cabinet inner breaker are serially connected in compensating cabinet function Rate module, stop button, control power supply composition control electric power loop in, in this way in the case where incoming line cabinet has a power failure, The corresponding breaker of incoming line cabinet disconnects, and normally opened auxiliary contact disconnect the control electric power loop of compensating cabinet, so that compensating cabinet Power-off stops working, to have the function that prevent overcompensation.After the breaker of incoming line cabinet has electricity to close a floodgate, normally opened auxiliary contact The control electric power loop of closure, the power unit module of compensating cabinet is powered, and compensating cabinet automatically begins to work.

As shown in Figure 2,3, the power unit module of compensating cabinet C by the first stop button TA1 and control power supply L, N (or Person 380V controls power supply) the first control electric power loop is formed, the power unit module of compensating cabinet I passes through the second stop button TA2 With control power supply L, N composition the second control electric power loop, the normally opened auxiliary contact K1 of the circuit breaker Q F1 of incoming line cabinet A is serially connected in In first control electric power loop；The normally opened auxiliary contact K2 of the circuit breaker Q F2 of incoming line cabinet K is serially connected in second source control loop In.Using above-mentioned interlock, so that after the circuit breaker Q F1 of incoming line cabinet A is disconnected, that is, when incoming line cabinet A power-off, open circuit The normally opened auxiliary contact K1 of device QF1 is in an off state, and the first control electric power loop disconnects at this time, and compensating cabinet C stops working；When When circuit breaker Q F1 is closed, that is, incoming line cabinet A work once electrified, the normally opened auxiliary contact K1 closure of circuit breaker Q F1, at this time first Control electric power loop is powered to forming electric loop, and compensating cabinet C follows work automatically at this time.It avoids so disconnected in incoming line cabinet A When electric, the Harmonics amplification of compensating cabinet C is acted on, and be ensure that the safe operation of power grid, is similarly set between incoming line cabinet K and compensating cabinet I Corresponding interlocking is set, ensure that compensating cabinet I is automatically stopped work, in circuit breaker Q F2 when the circuit breaker Q F2 of incoming line cabinet K disconnection When closure, normally opened auxiliary contact K2 closure, compensating cabinet I follows work automatically.

Above-mentioned this interlocking setting is met when incoming line cabinet A has a power failure, and the normally opened auxiliary contact K1 of circuit breaker Q F1, which is in, to be beaten Open state, compensating cabinet C stop working；When incoming line cabinet A obtains electricity operation, the normally opened auxiliary contact K1 of circuit breaker Q F1 is in closure State, compensating cabinet C operation；When incoming line cabinet K has a power failure, the normally opened auxiliary contact K2 of circuit breaker Q F2 is in the open state, compensating cabinet I stops working；When incoming line cabinet K obtains electricity operation, the normally opened auxiliary contact K2 of circuit breaker Q F2 is in closed state, compensating cabinet I fortune Row；So as to avoid overcompensation scene, the compensation accuracy of power grid is improved, ensure that the safe operation of power grid.

Obvious the utility model specific implementation is not subject to the restrictions described above, as long as using method concept of the invention The improvement of the various unsubstantialities carried out with technical solution, it is within the scope of the present invention.

Claims (2)

1. a kind of low-voltage distribution reactive compensation control system, including the first transformer circuit, the second transformer circuit, described first By mother cabinet F connection between transformer circuit and the second transformer circuit, first transformer circuit includes the first transformation Device, incoming line cabinet A, compensating cabinet C, load, first transformer are connected through incoming line cabinet A and load, and the compensating cabinet C is for compensating The idle of generation is loaded in first transformer circuit；Second transformer circuit includes the second transformer, incoming line cabinet K, compensation Cabinet I, load, second transformer are connected through incoming line cabinet K and load, and the compensating cabinet I is for compensating the second transformer circuit Middle load generates idle, it is characterised in that: setting is interlocked between the incoming line cabinet A and compensating cabinet C, so that the compensating cabinet C The unlatching of incoming line cabinet A is followed to be closed and synchronize and carry out unlatching closure；Setting is interlocked between the incoming line cabinet K and compensating cabinet I, so that Compensating cabinet I is closed according to the unlatching of incoming line cabinet K and synchronizes and carry out unlatching closure.

2. a kind of low-voltage distribution reactive compensation control system as described in claim 1, it is characterised in that: the compensating cabinet C's Power unit module passes through the first stop button TA1 and control power supply composition the first control electric power loop, the function of the compensating cabinet I Rate unit module passes through the second stop button TA2 and control power supply composition the second control electric power loop；Incoming line cabinet A and compensating cabinet C Between interlock setting are as follows: the normally opened auxiliary contact K1 of the circuit breaker Q F1 of incoming line cabinet A is serially connected in the first control electric power loop； Setting is interlocked between incoming line cabinet K and compensating cabinet I are as follows: the normally opened auxiliary contact K2 of the circuit breaker Q F2 of incoming line cabinet K is serially connected in second In power control loop.