CN205070286U - Distribution looped netowrk PT cabinet - Google Patents

Abstract

The utility model provides a power distribution ring network PT cabinet, which belongs to the technical field of electrical equipment and includes a three-station load switch, a lightning arrester, a voltage transformer, a fuse, a voltage transformer, a busbar and a cabinet body. The upper end of the load switch is connected to the bus bar, the three-position load switch is electrically connected to the fuse at the lower end, and the fuse is electrically connected to the voltage transformer at the lower end, and the lightning arrester is arranged at the three-position load switch and the voltage transformer, the three-position load switch, lightning arrester, voltage transformer, fuse, voltage transformer and busbar are all arranged inside the cabinet. The PT cabinet can directly take power from the busbar of the switching station and monitor the power, which can replace the functions realized by the previous two conventional PT cabinets, reduce the overall equipment footprint, and reduce the overall production cost of the equipment. And the reduction of one cabinet is also beneficial to installation and maintenance, with stable performance, simplified structure and high reliability.

Description

A distribution ring network PT cabinet

technical field

The utility model relates to a PT cabinet, in particular to a PT cabinet for a power distribution ring network, which belongs to the technical field of electrical equipment.

Background technique

In order to improve the reliability of power supply and enable users to obtain power from two directions, the power supply network is usually connected into a ring. This power supply method is referred to as the ring network power supply. In industrial and mining enterprises, residential quarters, ports and high-rise buildings and other AC 10KV power distribution systems, due to the small load capacity, the high-voltage circuit is usually controlled by a load switch or a vacuum contactor, and is equipped with a high-voltage fuse for protection. The system usually uses ring network power supply, and PT cabinets, namely voltage transformer cabinets, are added to the ring network power supply. Generally, they are directly installed on the busbar to detect the busbar voltage and realize the protection function. In the original box-type switching station, the PT cabinet takes power from the incoming line cabinet, and the rear plug-in cable plug is used in the incoming line cabinet. If this side is not used as the power incoming line end, it needs to be adjusted to the front plug-in cable plug. On-site adjustment is more troublesome; at the same time, the PT cabinet arrester of this scheme is always connected to the incoming power supply, and the replacement of the arrester requires the entire line of the superior substation to be powered off.

Utility model content

The technical problem to be solved by the utility model overcomes the existing defects, and provides a PT cabinet for power distribution ring network, which uses a three-station load switch, and the grounding position is checked and repaired. The fuse or the voltage transformer can be repaired and replaced with power on, and the load switch only needs to be turned to the grounding position during the repair, which can effectively solve the problems in the background technology.

In order to solve the above technical problems, the utility model provides the following technical solutions:

The utility model is a PT cabinet for power distribution ring network, which includes a three-station load switch, a lightning arrester, a voltage transformer, a fuse, a voltage transformer, a busbar and a cabinet body, and the upper end of the three-station load switch is connected to the busbar, The three-position load switch is electrically connected to the fuse at the lower end, and the fuse is electrically connected to the voltage transformer at the lower end. The lightning arrester is arranged between the three-position load switch and the voltage transformer. The above-mentioned three-position load switch, lightning arrester, voltage transformer, fuse, voltage transformer and busbar are all arranged inside the cabinet.

As a preferred technical solution of the utility model, the cabinet body is an integral structure.

As a preferred technical solution of the present utility model, the size and height of the cabinet body is 1490mm.

The beneficial effects achieved by the utility model are:

The PT cabinet can directly take power from the busbar of the switching station and monitor the power, which can replace the functions realized by the previous two conventional PT cabinets, reduce the overall equipment footprint, and reduce the overall production cost of the equipment. And the reduction of one cabinet is also beneficial to installation and maintenance, with stable performance, simplified structure and high reliability.

Description of drawings

The accompanying drawings are used to provide a further understanding of the utility model, and constitute a part of the description, and are used to explain the utility model together with the embodiments of the utility model, and do not constitute a limitation to the utility model.

In the attached picture:

Fig. 1 is a schematic structural view of a PT cabinet of a power distribution ring network described in an embodiment of the present invention;

Fig. 2 is a schematic diagram of a cabinet structure of a power distribution ring network PT cabinet according to an embodiment of the present invention.

Labels in the figure 1, three-position load switch; 2, lightning arrester; 3, voltage transformer; 4, fuse; 5, voltage transformer; 6, busbar and 7, cabinet.

detailed description

The preferred embodiments of the present utility model are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described here are only used to illustrate and explain the present utility model, and are not intended to limit the present utility model.

Embodiment: As shown in Figure 1-2, the utility model is a power distribution ring network PT cabinet, including a three-position load switch 1, a lightning arrester 2, a voltage transformer 3, a fuse 4, a voltage transformer 5, and a bus 6 and the cabinet body 7, the upper end of the three-position load switch 1 is docked with the bus bar 6, the three-position load switch 1 is electrically connected with the fuse 4 at the lower end, and the fuse 4 is electrically connected with the voltage transformer 5 at the lower end, The lightning arrester 2 is set between the three-position load switch 1 and the voltage transformer 3, and the three-position load switch 1, the lightning arrester 2, the voltage transformer 3, the fuse 4, the voltage transformer 5 and the busbar 6 are all set in the cabinet body 7 internal.

In order to close the electrical equipment, enhance the safety performance, and protect the equipment operators, the cabinet body 7 is an integral structure.

In order to realize direct combination of cabinets with other ring network switch cabinets, the size and height of the cabinet body 7 is 1490mm.

The lightning arrester 2 of the utility model is used to limit the overvoltage, so that the electrical equipment in the power system is protected from the harm of the atmospheric overvoltage and the internal overvoltage, and the voltage transformer 3 converts the high voltage into a standard low voltage (100V, 220V) for measurement , measurement, protection, and provide the operating power of other switches in the box-type switching station. The fuse 4 is used to fuse the fuse with the heat generated by itself when the current exceeds the specified value for a certain period of time when the circuit is overloaded or short-circuited. The switchgear that breaks the circuit due to melting of the body, the three-position load switch 1, operates the normal load current of the equipment, and can be adjusted to the grounding position for maintenance of the equipment. The upper end of the three-position load switch 2 is connected to the bus bar 6, and the current passes through The load switch is turned on and enters the voltage transformer 5 through the fuse 4, and is converted into the voltage required by the equipment through the transformation ratio of the voltage transformer 5. It adopts a closed plug-in type to connect with the bus bar, which reduces the safety distance and improves the safety and reliability. The cabinet uses a three-position load switch 1, which can be repaired at the grounding position, and can be repaired and replaced with a fuse 4 or a voltage transformer 5. During maintenance, the load switch only needs to be turned to the grounding position. Compared with the isolation knife that only has the opening and closing state, it is safer and more reliable. The special connector used for the box-type opening and closing of the PT cabinet is directly connected to the main busbar of the ring network cabinet. The main busbar is charged, and the PT cabinet can take power. It is mature The advanced three-station SF6 air bag replaces the isolation knife of the above scheme, with stable performance, simplified structure and high reliability.

Finally, it should be noted that: the above is only a preferred embodiment of the utility model, and is not intended to limit the utility model, although the utility model has been described in detail with reference to the foregoing embodiments, for those skilled in the art , it is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present utility model shall be included in the protection scope of the present utility model.

Claims (3)

1. A power distribution ring network PT cabinet, including a three-position load switch (1), a lightning arrester (2), a voltage transformer (3), a fuse (4), a voltage transformer (5), and a busbar (6) and the cabinet (7), characterized in that the upper end of the three-position load switch (1) is connected to the busbar (6), and the three-position load switch (1) is electrically connected to the fuse (4) at the lower end connection, the fuse (4) is electrically connected to the voltage transformer (5) at the lower end, and the lightning arrester (2) is arranged between the three-position load switch (1) and the voltage transformer (3), The three-position load switch (1), lightning arrester (2), voltage transformer (3), fuse (4), voltage transformer (5) and busbar (6) are all arranged inside the cabinet (7) . 2. A power distribution ring network PT cabinet according to claim 1, characterized in that, the cabinet body (7) is an integral structure. 3. A power distribution ring network PT cabinet according to claim 1 or 2, characterized in that the size and height of the cabinet body (7) is 1490mm.