CN205693355U - A kind of medium voltage power distribution cabinet main electrical scheme system - Google Patents

Abstract

A main wiring system of a medium-voltage power distribution cabinet according to the utility model includes a main wiring system of a medium-voltage power distribution cabinet, including a metering cabinet, a PT cabinet, an incoming line cabinet and a feeder cabinet, and the metering cabinet includes a first A current transformer, a first fuse, a voltage transformer for metering, a first electrified display and a first lightning arrester, and the incoming line terminal of the voltage transformer for metering passes through the first fuse and the first current transformer in turn and the medium-voltage connected to the bus bar, and the outlet terminals of the first current transformer are respectively grounded through the first charged display and the first lightning arrester. The PT cabinet includes a three-winding voltage transformer and a second fuse. The three-winding voltage transformer The incoming line end of the second fuse is connected to the medium-voltage busbar through the second fuse, and the incoming line end of the second fuse is grounded through the second arrester. The utility model has the advantages of simple structure and convenient use, which reduces the failure rate of the system, improves the quality of electric energy, ensures the reliability of electric power, reduces the expenditure of electricity charges, and improves the reliability of the distribution network.

Description

A main wiring system of a medium-voltage power distribution cabinet

technical field

The utility model relates to the technical field of power grid distribution, in particular to a main wiring system of a medium-voltage power distribution cabinet.

Background technique

At present, the reliability of the user-side power distribution system is one of the important indicators for the assessment of power supply enterprises, and it also reflects the operation status and technical management level of the power supply network. An important indicator of the degree of power development. With the development of the times, the user's power distribution system requires higher reliability, more flexible intelligence, easier operation, more energy-saving operation, simpler maintenance, and higher safety performance. At present, there is no unified standard user-side power distribution system solution in the power market, but the types of customer equipment are relatively complicated, the requirements for individualization are relatively strong, and the market is becoming more and more open, which brings difficulties to user-side power distribution. Moreover, because the power measuring equipment is not independent, there is also a hidden danger of power theft, which is likely to increase the line loss rate. In addition, there are certain unsafe factors in the existing wiring mode.

Utility model content

The technical problem to be solved by the utility model is to provide a main wiring system of a medium-voltage power distribution cabinet, which has a simple structure, convenient operation and maintenance, high working efficiency, and is safe and reliable.

In order to solve the above technical problems, the utility model adopts the following technical solutions: It includes a main wiring system of a medium voltage power distribution cabinet, including a metering cabinet, a PT cabinet, an incoming line cabinet and a feeder cabinet, and the metering cabinet includes a first current transformer , the first fuse, the voltage transformer for metering, the first charged display and the first lightning arrester, the incoming terminal of the voltage transformer for metering is connected to the medium-voltage bus through the first fuse and the first current transformer in sequence, The outlet ends of the first current transformer are respectively grounded through the first charged display and the first lightning arrester, the PT cabinet includes a three-winding voltage transformer and a second fuse, and the incoming line of the three-winding voltage transformer The terminal is connected to the medium-voltage busbar through the second fuse, and the incoming terminal of the second fuse is grounded through the second arrester.

As a further improvement of the above technical solution:

The incoming cabinet includes a first circuit breaker, a second current transformer and a second electrified display, the carrying end of the first circuit breaker is connected to the medium-voltage bus line, and the outlet end of the first circuit breaker passes through the connection between the second current transformer and the PT cabinet. The medium-voltage busbars are connected, and the second charged indicator is connected to the outlet terminal of the second current transformer.

The feeder cabinet includes a second circuit breaker, a third current transformer, an isolating switch, a third live display and a zero-sequence current transformer. The three current transformers are connected to the zero-sequence current transformer, the isolating switch and the third charged display are connected to the outlet terminal of the third current transformer, and the incoming terminal of the third charged display is grounded through the third lightning arrester.

The beneficial effects of the utility model are: the main wiring system of the medium-voltage power distribution cabinet described in the utility model not only has a simple structure and is convenient to use, reduces the failure rate of the system, improves the power quality, but also has convenient operation and maintenance and high working efficiency. High, low construction and operating costs, can give full play to the advantages of scale and improve the overall efficiency. The system can be used as a backup power supply to provide power to users who require uninterrupted power supply, to ensure the reliability of power, reduce electricity costs, and improve the reliability of the distribution network.

Description of drawings

Figure 1 is a diagram of the main wiring system of the medium-voltage power distribution cabinet of the present invention.

detailed description

Below in conjunction with accompanying drawing, the utility model is further described.

As shown in Figure 1, the main wiring system of the medium-voltage power distribution cabinet in this embodiment includes a metering cabinet 1, a PT cabinet 2, an incoming line cabinet 3, and a feeder cabinet 4. The metering cabinet 1 includes a first current transformer 11, a first Fuse 12, voltage transformer 13 for metering, first charged indicator 14 and first lightning arrester 15, the incoming line terminal of voltage transformer 13 for metering passes through the first fuse 12 and the first current transformer 11 and the medium voltage bus in turn Connected, the outlet end of the first current transformer 11 is grounded respectively through the first charged display 14 and the first lightning arrester 15, the PT cabinet 2 includes a three-winding voltage transformer 21 and a second fuse 22, and the three-winding voltage transformer 21 The incoming line terminal of the second fuse 22 is connected to the medium-voltage busbar through the second fuse 22 , and the incoming line end of the second fuse 22 is grounded through the second arrester 23 .

In this embodiment, the incoming line cabinet 3 includes a first circuit breaker 31, a second current transformer 32 and a second charged display 33. The transformer 32 is connected to the medium-voltage busbar of the PT cabinet 2 , and the second charged indicator 33 is connected to the outlet terminal of the second current transformer 32 .

Further, the feeder cabinet 4 includes a second circuit breaker 41, a third current transformer 42, an isolating switch 43, a third electrified display 44 and a zero-sequence current transformer 45. The carrying end of the second circuit breaker 41 is connected to the medium voltage bus connected, its outlet end is connected with the zero-sequence current transformer 45 through the third current transformer 42, the isolating switch 43 and the third electrified indicator 44 are connected at the outlet end of the third current transformer 42, and the incoming line of the third electrified indicator 44 terminal through the third lightning arrester 46 to ground.

The main wiring system of the medium-voltage power distribution cabinet described in the utility model not only has a simple structure and is convenient to use, reduces the failure rate of the system, improves the power quality, but also has convenient operation and maintenance, high work efficiency, and low construction and operation costs. It can give full play to the advantage of scale and improve the overall efficiency. The system can be used as a backup power supply to provide power to users who require uninterrupted power supply, to ensure the reliability of power, reduce electricity costs, and improve the reliability of the distribution network.

Claims (3)

1. a medium voltage power distribution cabinet main electrical scheme system, it is characterised in that: include metering cabinet (1), PT cabinet (2), incoming line cabinet (3) and feedback Line cabinet (4), described metering cabinet (1) includes the first current transformer (11), the first fuse (12), metering voltage transformer (13), the first electrification display (14) and the first spark gap (15), the end of incoming cables of described metering voltage transformer (13) is successively It is connected with middle pressure bus with the first current transformer (11) through the first fuse (12), going out of described first current transformer (11) Line end is respectively through the first electrification display (14) and the first spark gap (15) ground connection, and described PT cabinet (2) includes three winding formula voltage Transformer (21) and the second fuse (22), the end of incoming cables the second fuse (22) of described three winding formula voltage transformer (21) It is connected with middle pressure bus, end of incoming cables the second spark gap (23) ground connection of described second fuse (22).

Medium voltage power distribution cabinet main electrical scheme system the most according to claim 1, it is characterised in that: described incoming line cabinet (3) includes One chopper (31), the second current transformer (32) and the second electrification display (33), the carrying out of described first chopper (31) End and middle pressure two buss lines, its leading-out terminal is connected with the middle pressure bus of PT cabinet (2) through the second current transformer (32), and described second Electrification display (33) is connected to the leading-out terminal of the second current transformer (32).

Medium voltage power distribution cabinet main electrical scheme system the most according to claim 1, it is characterised in that: described feeder cabinet (4) includes Two choppers (41), the 3rd current transformer (42), disconnecting switch (43), the 3rd electrification display (44) and zero sequence current mutual inductance Device (45), the carrying out of described second chopper (41) hold and be connected with middle pressure bus, and its leading-out terminal is through the 3rd current transformer (42) Being connected with zero sequence current mutual inductor (45), it is mutual that described disconnecting switch (43) and the 3rd electrification display (44) are connected to the 3rd electric current The leading-out terminal of sensor (42), the 3rd spark gap (46) ground connection is passed through in the end of incoming cables of described 3rd electrification display (44).