CN203811656U - Electric energy metering combined junction box - Google Patents

Abstract

An electric energy metering combined junction box comprises a junction box body, the junction box body comprises voltage line wiring terminal areas and current line wiring terminal areas, the current line wiring terminal areas are provided with two-electrode normally connected wiring terminals SA and two-electrode normally connected wiring terminals SB, the two-electrode normally connected wiring terminals SA and the two-electrode normally connected wiring terminals SB are respectively connected with two kinds of electric streamlines, short-circuit connecting pieces are connected between the two-electrode normally connected wiring terminals SA and the two-electrode normally connected wiring terminals SB, and the short-circuit connecting pieces are in a normally open state when a circuit runs. The two-electrode normally connected wiring terminals has the advantages of simple structure and the low misoperation rate, and the service lives of the short-circuit connecting pieces are long.

Description

A combined junction box for electric energy metering

technical field

The utility model relates to an electric energy metering device, in particular to an electric energy metering combined junction box.

Background technique

Commonly used electric energy metering joint junction box, its current line terminal area is designed as three poles, its lower end current line SA, SB is connected to 1st and 2nd poles, and the upper end SA, SB is connected to 1st, 3rd poles. Between the 1st and 2nd poles, there is a normally open diversion piece. The current line SB is connected through the connecting sheet between the 2 and 3 poles. When it is necessary to change the meter with electricity, it is necessary to connect the diversion link between the 1st and 2nd poles.

The article "Application of electric energy metering combined junction box in secondary circuit" published by Chen Lijun in "Ningxia Electric Power" No. 4, 2010 (CLC number: TM933.4, document code: B, article number 1672-3643 (2010) 04-06403) described a joint junction box for electric energy metering, the current line terminal area is also designed as three-pole, and contains two short-circuit connecting pieces. This three-pole design includes two types of short-circuit connecting pieces, which have a complex structure. Due to the normally open or normally closed connection of the double-short-circuit connecting pieces, it is easy to cause miswiring or open circuit of the current transformer during operation, resulting in misoperation. In addition, because one of the short-circuit connecting pieces is normally closed, it is prone to heat and ablation during long-term operation, so that the secondary side of the current transformer is open, resulting in less metered electricity, and it is also easy to pose a high-voltage threat to metering and census personnel.

Contents of the invention

The purpose of the utility model is to overcome the problems of complex structure and easy ablation of the short-circuit connecting piece caused by the three-pole design of the electric energy metering box in the prior art, and provide a simple structure, long service life of the short-circuit connecting piece, and low misoperation rate. Combined junction box for energy metering.

In order to achieve the above purpose, the technical solution adopted by the utility model is: a joint junction box for electric energy metering, including a junction box, the junction box includes a voltage line connection terminal area and a current line connection terminal area, and the current line connection terminal area There are two-pole normally-on terminals SA and SB, and the two-pole normally-on terminals SA and SB are respectively connected to two current wires IA and IB. There is a short-circuit connecting piece between the two-pole normally-on terminals SA and SB, and the circuit is short-circuited during operation. The continuous piece is normally open.

The junction box is a three-phase four-wire junction box or a three-phase three-wire junction box.

Compared with the prior art, the beneficial effects of the utility model are:

1. Since the junction box adopts a two-pole design and only includes one short-circuit connection piece, one pole and one short-circuit connection piece are less than the traditional junction box, the structure is simple, and the copper material used at the same time is less, which saves costs.

2. This design only includes a normally open short-circuit connection piece, which has a long service life and is not easy to cause misoperation such as miswiring or current transformer mistaken opening.

Description of drawings

Fig. 1 is the front view of the utility model.

Among them, the junction box 1, the voltage line terminal area 2, the current line terminal area 3, the terminal SA4, the terminal SB5, the current line IA6, the current line IB7, and the short-circuit connection piece 8.

Detailed ways

Below in conjunction with schematic diagram 1 the utility model is further described.

Referring to Fig. 1, a combined junction box for electric energy metering includes a junction box 1, the junction box 1 includes a voltage line terminal area 2 and a current line terminal area 3, and the current line terminal area 3 is provided with two poles normally connected Connecting terminals SA4 and SB5, the two-pole normally-on connecting terminals SA4 and SB5 are respectively connected to two current wires IA6 and IB7, and a short-circuit connecting piece 8 is connected between the two-pole normally-on connecting terminals SA4 and SB5. When the circuit is running, the short-circuit connecting piece 8 is Normally open state.

The junction box 1 is a three-phase four-wire junction box or a three-phase three-wire junction box.

In this design, the current line terminal area 3 of the combined junction box with electric energy metering device is changed from a three-pole design to a two-pole normally-on terminal block SA4 and SB5, and the two-pole normally-on terminal blocks SA4 and SB5 are respectively connected to two current lines IA6 and IB7 , a short-circuit connecting piece 8 is added between the two poles, which is used for changing the meter with electricity. When the circuit is in normal operation, the short-circuit connecting piece 8 is in the normally open state, which avoids the formation of normally open or normally closed connections when there are double short-circuit connecting pieces in the three-pole design. Miswiring or current transformer mistakenly open circuit. The junction box 1 can choose to use a three-phase four-wire junction box or a three-phase three-wire junction box as required. Since the junction box 1 adopts a two-pole design and only includes one short-circuit connecting piece 8, one pole and one short-circuit connecting piece 8 are less than the traditional design, the structure is simple, and the copper material used is less at the same time, which saves the cost. This design only includes a normally open short-circuit connecting piece 8, the short-circuit connecting piece 8 has a long service life, and at the same time, it is not easy to cause misoperation such as miswiring or mistaken opening of the current transformer. The utility model has the advantages of simple structure, long service life of short-circuit connecting pieces, and low misoperation rate.

Claims (2)

1. A combined junction box for electric energy metering, comprising a junction box (1), the junction box (1) including a voltage line terminal area (2) and a current line terminal area (3), characterized in that: the current The line terminal area (3) is provided with two-pole normally-connected terminals SA (4) and SB (5), and the two-pole normally-connected terminals SA (4) and SB (5) are respectively connected with two current wires IA (6) and IB (7) are connected, and a short-circuit connecting piece (8) is connected between the two-pole normally-connected terminals SA (4) and SB (5), and the short-circuit connecting piece (8) is normally open when the circuit is running. 2. A combined electric energy metering junction box according to claim 1, characterized in that: the junction box (1) is a three-phase four-wire junction box or a three-phase three-wire junction box.