CN108598922A - Segmented threephase load phasing switch cabinet - Google Patents

Abstract

The invention discloses a segmented three-phase load phase-modulating switch cabinet, which includes a cabinet body, a three-phase isolating switch, a first bus bar, a second bus bar and a third bus bar arranged in the cabinet body; The first busbar, the second busbar, and the third busbar are respectively connected to the A-phase outlet connector, B-phase outlet connector, and C-phase outlet connector of the three-phase isolating switch in one-to-one correspondence; the first The busbar, the second busbar, and the third busbar are spaced apart from each other, and between the first busbar and the second busbar and between the second busbar and the third busbar Each room is connected to a power switch. The present invention can divide the load into one group or three groups or one large group and one small group through the on-off of two power switches, and through the A, B, C three-phase control of the three-phase isolating switch, one-phase or two-phase Phase or three-phase power supply, and the distribution of load in three phases can be flexibly adjusted through three busbars, so as to achieve the purpose of fine adjustment and facilitate operation and management.

Description

Segmented three-phase load phase modulation switchgear

technical field

The invention relates to the field of electric equipment, in particular to a segmented three-phase load phase-modulating switchgear.

Background technique

Due to the regional differences in the development level of distribution network automation, the three-phase unbalance control in many low-voltage station areas still adopts the solutions of on-site measurement of three-phase current by clamp current meter, power failure phase adjustment, and load transfer; this method requires staff to board the distribution transformer. Working on the low-voltage side of the bench, the operation is difficult, the adjustment period is long, and it will cause unnecessary power outages to users, and the maintenance time of the three-phase load balance after adjustment is not long, which needs to be improved urgently.

In recent years, the three-phase load automatic adjustment technology has been developing day by day. At present, there are three main typical application modes, namely, commutation switch type automatic adjustment device, capacitive automatic adjustment device and power electronic automatic adjustment device, capacitive automatic adjustment device and power electronic automatic adjustment device. The type automatic adjustment device can only adjust the load balance on the outlet side of the transformer, and cannot fundamentally solve the problem of actual load balance distribution. However, the traditional phase-change switch type automatic adjustment device has high construction costs and generally adopts "point "Touch" phase modulation switch, there is a risk that the opening and closing will not be in place, and it needs to be improved urgently.

Contents of the invention

The technical problem to be solved by the present invention is to provide a segmented three-phase load phase-modulating switchgear that can realize one-phase, two-phase or three-phase power supply, and can flexibly adjust the load distribution among the three phases.

In order to solve the above technical problems, the present invention adopts the following technical solutions: segmented three-phase load phase-modulating switchgear, including a cabinet body and a three-phase isolating switch arranged in the cabinet body, the first busbar, the second busbar and the third busbar;

The first busbar, the second busbar, and the third busbar are respectively connected to the A-phase outlet connector, B-phase outlet connector, and C-phase outlet connector of the three-phase isolating switch in one-to-one correspondence;

The first bus bar, the second bus bar, and the third bus bar are spaced apart from each other, and between the first bus bar and the second bus bar and between the second bus bar and the first bus bar Power switches are connected between the three busbars.

Further, the three-phase isolating switch is a three-phase isolating air switch.

Further, the power switch is a knife switch.

Further, a circuit breaker is also provided in the cabinet, and the A-phase incoming joint, B-phase incoming joint, and C-phase incoming joint of the three-phase isolating switch are respectively connected to the outlet terminals of the circuit breaker.

Further, the cabinet is also provided with three coils spaced apart from each other, and the A-phase feed joint, B-phase feed joint, and C-phase feed joint of the three-phase isolating switch are respectively connected to the circuit breaker through three busbars in one-to-one correspondence. connection, the three bus bars pass through the three coils in one-to-one correspondence.

Further, a fuse is also provided in the cabinet.

Further, a remote controller is also provided in the cabinet.

Further, the outer surface of the cabinet is provided with a PD intelligent display meter.

Further, the outer surface of the cabinet is provided with three indicator lights for respectively displaying the three-phase opening and closing states of the three-phase isolating switch.

Further, the cabinet body is equipped with a cabinet door.

The beneficial effects of the present invention are reflected in:

The present invention can divide the load into one group or three groups or one large group and one small group through the on-off of two power switches, and through the A, B, C three-phase control of the three-phase isolating switch, one-phase or two-phase Phase or three-phase power supply, and when one-phase or two-phase power supply is selected, you can also choose arbitrarily among the three phases A, B, and C to realize the function of phase change adjustment. When the load of one phase of residential electricity is overloaded, switch Two-phase or three-phase load, so that it does not overload, once the adjustment is unsuccessful, you can also flexibly adjust the distribution of the load in the three-phase through three busbars (each busbar can be connected to users with a certain load in different proportions) ), to achieve a more refined three-phase load distribution, not only can achieve a more ideal three-phase load regulation effect, but also greatly reduce the construction cost of the device, which has high application value.

Description of drawings

Fig. 1 is a schematic diagram of the external structure of an embodiment of the present invention.

Fig. 2 is a schematic diagram of the internal structure of an embodiment of the present invention.

The marks of the components in the drawings are: 1 cabinet, 2 three-phase isolating switch, 3 first busbar, 4 second busbar, 5 third busbar, 6 power switch, 7 coil, 8 circuit breaker, 9 fuse device, 10 remote controllers, 11PD intelligent display meter, 12 indicator lights, 13 cabinet doors, and 14 door switches.

Detailed ways

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

See Figures 1 and 2.

The segmented three-phase load phase-modulating switch cabinet of the present invention includes a cabinet body 1 and a three-phase isolating switch 2 arranged in the cabinet body 1, a first bus bar 3, a second bus bar 4 and a third bus bar 5 ;

The first busbar 3, the second busbar 4, and the third busbar 5 are in one-to-one correspondence with the A-phase outlet connector, B-phase outlet connector, and C-phase outlet connector of the three-phase isolating switch 2, respectively. connect;

The first bus bar 3, the second bus bar 4, and the third bus bar 5 are spaced apart from each other, and between the first bus bar 3 and the second bus bar 4 and the second bus bar A power switch 6 is connected between the row 4 and the third busbar 5 .

When in use, the load can be connected to each busbar as required.

With this design, the three busbars can be combined flexibly by closing and disconnecting two power switches. When both power switches are closed, the first busbar, the second busbar and the third busbar are connected as a whole. Form a group of loads; when the two power switches are disconnected, the first bus bar, the second bus bar, and the third bus bar are independently regarded as a whole to form three groups of loads; when one of the two power switches When it is disconnected and the other is closed, the first busbar and the second busbar or the second busbar and the third busbar are connected as a whole, and the remaining busbars are independently used as a whole to form a large and a small group of loads .

And the first bus bar, the second bus bar, and the third bus bar can independently control the connection and disconnection of the three phases A, B, and C through the three-phase isolating switch.

The working principle of the present invention is: in the normal operating state, both power switches are closed, the three busbars are connected as a whole, and the loads connected to each busbar are only connected to A, B, and C through the three busbars as a whole. One of the three phases (that is, only one phase of the three-phase isolating switch is closed); when fine adjustment is required, the load can be recombined by controlling the on-off of the two power switches, and the power supply originally supplied by the one-phase power supply The load is distributed to two or three phases of the three phases, and then the two or three phases of the three-phase isolating switch are closed to achieve more fine load distribution.

In one embodiment, the three-phase isolating switch 2 is a three-phase isolating air switch. Compared with other types, the advantage of choosing the air type is that the air switch can reliably carry the rated operating current in a stable working environment in the low-voltage circuit, and can also provide reliable protection for the line and load in the fault environment, with high Breaking capacity, strong current limiting characteristics, reliable arc extinguishing characteristics.

In one embodiment, the power switch 6 is a knife switch. With the knife switch, the closing and breaking operation is convenient and the control is reliable.

In one embodiment, a circuit breaker 8 is also provided in the cabinet body 1, and the A-phase incoming joint, B-phase incoming joint, and C-phase incoming joint of the three-phase isolating switch 2 are respectively connected to the outgoing line of the circuit breaker 8. end connection. The circuit breaker is located on the incoming line side, and its incoming line end is connected to the power supply, and its function in the circuit is to connect and break the main circuit.

In one embodiment, the cabinet body 1 is also provided with three coils 7 spaced apart from each other, and the A-phase feed joint, B-phase feed joint, and C-phase feed joint of the three-phase isolating switch 2 pass through three coils one by one. The bus bars are respectively connected to the circuit breakers 8 , and the three bus bars pass through the three coils 7 in one-to-one correspondence. The coil here can also be called a low-voltage current transformer. Its function is to collect the current in the line and feed back the value to the digital display meter. The secondary terminal of the low-voltage current transformer is connected to the digital display meter through the control loop.

In one embodiment, a fuse 9 is further provided in the cabinet body 1 . The fuse is located in the control circuit, and the function is that when the secondary line fails, the fuse will be blown and separated to protect the electrical components. Both sides of the fuse are respectively connected to the main circuit busbar and the secondary terminal.

In one embodiment, the outer surface of the cabinet body 1 is provided with a PD intelligent display meter 11 . PD intelligent display meter can display real-time current and voltage and other numerical information, so as to artificially judge the working status of the circuit. The PD intelligent display meter is connected to the low-voltage current transformer and the secondary terminal respectively.

In one embodiment, the outer surface of the cabinet body 1 is provided with three indicator lights 12 for respectively displaying the three-phase opening and closing states of the three-phase isolating switch 2 . Preferably, the three indicator lights are yellow, green and red in turn.

In one embodiment, a remote controller 10 is further provided in the cabinet body 1 . The remote controller is composed of a controller and a transmitter. The transmitter gives a signal, and the controller in the cabinet controls the opening and closing of the three-phase isolating switch. In the prior art, there are many controllers capable of controlling the opening and closing of the three-phase isolating switch, which will not be repeated here.

In one embodiment, the cabinet body 1 is equipped with a cabinet door 13 . Easy to open and close the cabinet cavity. Door switch 14 can be set on the cabinet door 13, is convenient to switch cabinet door.

Finally, it should be noted that: the above is only a preferred embodiment of the present invention, and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, it still The technical solutions recorded in the foregoing embodiments may be modified, or some of the technical features may be replaced equivalently, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the within the protection scope of the present invention.

Claims (10)

1. Segmented three-phase load phase-modulating switchgear, characterized in that it includes a cabinet (1) and a three-phase isolating switch (2) arranged in the cabinet (1), the first busbar (3) , the second busbar (4) and the third busbar (5); The first busbar (3), the second busbar (4), and the third busbar (5) are respectively connected to the A-phase outlet connector and the B-phase outlet connector of the three-phase disconnector (2) , C-phase outlet connectors are connected in one-to-one correspondence; The first busbar (3), the second busbar (4), and the third busbar (5) are distributed at intervals from each other, and the first busbar (3) and the second busbar ( 4) and between the second busbar (4) and the third busbar (5) are connected with power switches (6). 2. The segmented three-phase load phase-modulating switchgear according to claim 1, characterized in that: the three-phase isolating switch (2) is a three-phase isolating air switch. 3. The segmented three-phase load phase-modulating switchgear according to claim 1 or 2, characterized in that: the power switch (6) is a knife switch. 4. The segmented three-phase load phase-modulating switch cabinet according to claim 1 or 2, characterized in that: a circuit breaker (8) is also provided in the cabinet (1), and the three-phase isolating switch ( 2) A-phase inlet connector, B-phase inlet connector, and C-phase inlet connector are respectively connected to the outlet terminals of the circuit breaker (8). 5. The segmented three-phase load phase-modulating switch cabinet according to claim 4, characterized in that: the cabinet (1) is also provided with three coils (7) spaced apart from each other, and the three-phase isolation The A-phase feed joint, the B-phase feed joint, and the C-phase feed joint of the switch (2) are respectively connected to the circuit breaker (8) through three bus bars in one-to-one correspondence, and the three bus bars pass through the three described bus bars in one-to-one correspondence. Coil (7). 6. The segmented three-phase load phase-modulating switchgear according to claim 1 or 2, characterized in that: a fuse (9) is also provided in the cabinet body (1). 7. The segmented three-phase load phase-modulating switch cabinet according to claim 1 or 2, characterized in that: a remote controller (10) is also provided in the cabinet body (1). 8. The segmented three-phase load phase-modulating switch cabinet according to claim 1 or 2, characterized in that: the outer surface of the cabinet body (1) is provided with a PD intelligent display meter (11). 9. The segmented three-phase load phase-modulating switchgear according to claim 1 or 2, characterized in that: the outer surface of the cabinet (1) is provided with three respectively for displaying the three-phase isolating switch (2 ) indicator light (12) of the three-phase opening and closing state. 10. The segmented three-phase load phase-modulating switchgear according to claim 1 or 2, characterized in that: the cabinet body (1) is equipped with a cabinet door (13).