CN102798838B - Pluggable safety junction box for site calibration of electric energy meter - Google Patents

Abstract

The embodiment of the invention discloses a plug-in electric energy meter on-site verification safety junction box, which includes a wiring socket and a wiring plug; Transformers, current sampling metal parts and voltage sampling metal parts; the socket shell is provided with current sampling jacks, voltage sampling jacks and insulating jacks; the secondary side of the current transformer is connected to the current sampling metal parts, The current line of the electric energy meter to be tested is connected with the primary side of the current transformer; the voltage sampling metal part is connected with the voltage line of the electric energy meter to be tested; plug. The invention avoids the open circuit of the secondary current loop during use and overcomes the potential safety hazards existing in the existing junction box.

Description

A safety junction box for on-site verification of plug-in electric energy meters

technical field

The invention relates to the field of electric power technology, in particular to a safety junction box for on-site verification of a plug-in electric energy meter.

Background technique

According to the requirements of DL/T 448-2000 "Technical Management Regulations for Electric Energy Metering Devices", the on-site verification of the actual operating load of the high-voltage electric energy metering device in operation should be carried out. Therefore, the electric energy metering device connected to the secondary circuit of the transformer should be installed easily and The junction box connected to the on-site calibrator is convenient for on-site load calibration.

In the process of realizing the present invention, the inventor found that the existing junction boxes have potential safety hazards in the use process: when wiring, the metal terminals are all exposed, which can easily cause electric shock to the operator; The tester is connected in series to the secondary current circuit of the metering transformer, which not only makes the connection of the current connection not firm, but also causes the secondary current circuit to open due to human error, causing damage to the primary transformer and affecting the safe and stable operation of the entire power grid. .

Contents of the invention

In view of this, the purpose of the present invention is to provide a safety junction box for on-site verification of a plug-in electric energy meter, so as to avoid the open circuit of the secondary current loop during use and overcome the safety hazards existing in the existing junction box.

To achieve the above object, the present invention provides the following technical solutions:

A safety junction box for on-site verification of a plug-in electric energy meter, including a wiring socket and a wiring plug;

The wiring socket includes a socket shell, and a current transformer, a current sampling metal piece and a voltage sampling metal piece placed in the cavity formed by the socket shell;

The socket housing is provided with a current sampling jack, a voltage sampling jack and an insulating jack; the secondary side of the current transformer is connected to the current sampling metal piece, and the current wire of the electric energy meter to be tested is connected to the current transformer The primary side is connected; the voltage sampling metal piece is connected to the voltage line of the electric energy meter to be tested;

The wiring plug includes a hand-held part, a current sampling plug connected to the current input end and the current output end of the on-site calibrator, a voltage sampling plug connected to the voltage input end of the on-site calibrator and an insulating plug; the current The sampling plug, the voltage sampling plug and the insulating plug are fixed on the handle;

The current sampling plug is inserted into the wiring socket through the current sampling jack, and is movably connected with the current sampling metal part; the voltage sampling plug is inserted into the wiring socket through the voltage sampling jack, and connected to the wiring socket. The above-mentioned voltage sampling metal parts are flexibly connected.

Preferably, the current transformer is a feedthrough current transformer.

Preferably, the current sampling metal piece and the voltage sampling metal piece are beryllium copper shrapnel metal pieces.

Preferably, a card slot is provided at the bottom of the socket housing; the wiring socket is fixed inside the metering cabinet where the electric energy meter to be measured is located through the card slot, and the wiring plug is placed outside the metering cabinet.

It can be seen from the above-mentioned technical scheme that the present invention connects the secondary current loop of the electric energy meter to be tested to the primary side of the current transformer, and connects the on-site The calibrator is connected to the secondary side of the current transformer, and through the current induction of the current transformer, the on-site calibrator can obtain the current and voltage of the electric energy meter to be tested, without directly connecting the on-site calibrator to the electric energy to be tested. The secondary current circuit of the meter, thus eliminating the potential safety hazards of the power grid, equipment and personal safety caused by the open circuit of the secondary circuit of the electric energy meter to be tested during wiring calibration. And all kinds of sampling metal parts are encapsulated in the plug shell, and are not exposed to the outside, which eliminates the hidden danger of electric shock caused by the calibration personnel accidentally touching the terminal or the point circuit.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

FIG. 1 is a schematic structural view of a junction box provided by an embodiment of the present invention;

2 is a schematic cross-sectional structure diagram of the current sampling part of the junction box provided by the embodiment of the present invention;

3 is a schematic cross-sectional structure diagram of the voltage sampling part of the junction box provided by the embodiment of the present invention;

Fig. 4 is a schematic diagram when the junction plug of the junction box provided by the embodiment of the present invention is just inserted into the junction base;

Fig. 5 is a schematic diagram when the junction plug of the junction box provided by the embodiment of the present invention is fully inserted into the junction base;

Fig. 6 is a schematic diagram of an arrangement of the sampling elements of the junction box provided by the embodiment of the present invention;

FIG. 7 is a schematic structural view of a junction base of a junction box provided by an embodiment of the present invention.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

The embodiment of the invention discloses a safety junction box for on-site verification of a plug-in electric energy meter, so as to avoid the open circuit of the secondary current loop during use and overcome the safety hazards existing in the existing junction box.

Referring to Figures 1 to 3, the plug-in electric energy meter field verification safety junction box provided by the embodiment of the present invention includes a wiring socket 1 and a wiring plug 2;

The wiring socket 1 includes a socket housing 11, a current transformer 12, a current sampling metal piece 13 and a voltage sampling metal piece 14. The socket housing 11 forms a fully enclosed cavity, and the current transformer 12, the current sampling metal piece 13 and the voltage sampling metal piece The pieces 14 are all placed in the cavity, and the current sampling metal piece 13 and the voltage sampling metal piece 14 are fixedly connected to the socket shell 11 through the nut 05;

The socket housing 11 is provided with a current sampling jack 15, a voltage sampling jack 16 and an insulating jack 17; the secondary side of the current transformer 12 is connected to the current sampling metal piece 13, and the current wire 01 of the electric energy meter to be tested is connected to the current transformer 12 The primary side is connected; the voltage sampling metal piece 14 is connected with the voltage line of the electric energy meter to be measured;

The wiring plug 2 includes a hand-held part 24, a current sampling plug 21 connected to the current input terminal 02 and the current output terminal 03 of the on-site calibrator, a voltage sampling plug 22 connected to the voltage input end 04 of the on-site calibrator and an insulating plug 23 ; The current sampling plug 21, the voltage sampling plug 22 and the insulating plug 23 are fixed on the hand-held part 24;

The current sampling plug 21 is inserted into the wiring socket 1 through the current sampling jack 15, and is movably connected with the current sampling metal piece 13; the voltage sampling plug 22 is inserted into the wiring socket 1 through the voltage sampling jack 16, and is movably connected with the voltage sampling metal piece 14.

Since the wiring socket is always connected with the measured electric energy meter, the primary side of the current transformer 12 always has a current flowing through it. In order to prevent its secondary side from being open, the non-conductive insulating plug 23 is slightly shorter than the current sampling plug 21, so that: in the wiring plug 2 When the connection socket 1 is not inserted, the two current sampling metal parts 13 connected to the same current transformer 12 are in contact with each other (06 in Fig. The secondary side is short-circuited, as shown in Figure 2; when the wiring plug 2 is inserted into the wiring socket 1, the current sampling metal part and the current sampling plug first contact (that is, the current sampling path as the secondary side load of the current transformer 12 is first connected , as shown in FIG. 4 ), the insulating plug 23 is then inserted between the two connected current sampling metal pieces 13 to disconnect them, as shown in FIG. 5 .

It can be seen from the structure and circuit connection method of the above-mentioned plug-in electric energy meter field verification safety junction box, the embodiment of the present invention connects the secondary current loop of the electric energy meter to be tested to the primary side of the current transformer, and takes the current sampling metal parts, Voltage sampling metal parts, current sampling plug and voltage sampling plug Connect the field calibrator to the secondary side of the current transformer, and through the current induction of the current transformer, the field calibrator can obtain the current and voltage of the electric energy meter to be tested , It is not necessary to directly connect the on-site calibrator to the secondary current circuit of the electric energy meter to be tested, thereby eliminating the potential safety hazards of the power grid, equipment and personal safety caused by the open circuit of the secondary circuit of the electric energy meter to be tested during the calibration wiring. And all kinds of sampling metal parts are encapsulated in the plug shell, and are not exposed to the outside, which eliminates the hidden danger of electric shock caused by the calibration personnel accidentally touching the terminal or the point circuit.

Specifically, the current transformer 12 in the above embodiment can be a feed-through current transformer, through which the current wire of the electric energy meter to be measured passes through the feed-through current transformer to realize the connection with the primary side of the current transformer.

Further, since the electric energy meter to be tested is a three-phase four-wire electric energy meter, there are three feed-through current transformers 12, which are respectively passed through by the three-phase current lines A, B, and C, and the current sampling metal parts 13, current sampling There are 6 jacks 15 and current sampling plugs 21, 3 of which are used for current input, and the other 3 are used for current output; there are 4 voltage sampling metal parts 14, voltage sampling jacks 16 and voltage sampling plugs 22, They are respectively used for the connection of A, B, and C three-phase voltage lines and neutral lines; there are three insulating jacks 17 and insulating plugs 23.

For the convenience of plug and play, the above components can be arranged as shown in Figure 6, 111~113 correspond to three current sampling metal parts 13 connected to the secondary side of different feed-through current transformers, or three current sampling plugs Holes 15, or 3 current sampling plugs 21, are used for current input; 201~204 correspond to 4 voltage sampling metal parts, or 4 voltage sampling jacks, or 4 voltage sampling plugs; 121~123 correspond to 3 and the same The contact parts 06 of the two current sampling metal parts 13 connected by the feedthrough current transformer 12, or three insulating jacks 17, or three insulating plugs 23; 131~133 correspond to the remaining three current sampling metal parts 13, or The other three current sampling jacks 15 or the other three current sampling plugs 21 are used for current output.

It can be seen that the junction box described in the embodiment of the present invention adopts the plug-socket access mode, and no auxiliary tools are needed when verifying the wiring; only the wiring operation is required for the first installation (connecting the electric energy meter to be tested with the wiring socket) , when calibrating, you only need to insert various sampling plugs into the wiring socket through the sampling jack, and then various sampling plugs can be connected to the corresponding sampling metal parts to realize the access of the on-site calibrator, which is easy to operate and reduces Improve the operation level requirements of calibration personnel, reduce or even eliminate wrong wiring.

Further, in other embodiments of the present invention, the current sampling metal part 13 and the voltage sampling metal part 14 in the above embodiment may specifically use beryllium copper shrapnel metal parts.

Further, in other embodiments of the present invention, the bottom of the socket housing 1 in all the above-mentioned embodiments is provided with a card slot 07, as shown in FIG. Inside, the wiring plug 2 is placed outside the metering cabinet.

In the above embodiments of the present invention, the wiring base is fixed inside the metering cabinet, and the lead wires of the current loop and the voltage loop of the electric energy meter are not exposed to the metering cabinet, so as long as the metering cabinet is not opened, the current loop of the electric energy meter cannot be short-circuited or the voltage loop is disconnected. open; and the current and voltage of the energy meter are obtained through the current induction of the feed-through current transformer in the wiring base, and the short circuit of the current loop through the wiring base is only the secondary side of the feed-through current transformer. The current loop of the energy meter is short-circuited, and the voltage loop cannot be disconnected. Therefore, the above-mentioned embodiment of the present invention eliminates the hidden danger of electricity theft.

The above description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (4)

1. A safety junction box for on-site verification of a plug-in electric energy meter, characterized in that it includes a wiring socket and a wiring plug; The wiring socket includes a socket shell, and a current transformer, a current sampling metal piece and a voltage sampling metal piece placed in the cavity formed by the socket shell; The socket housing is provided with a current sampling jack, a voltage sampling jack and an insulating jack; the secondary side of the current transformer is connected to the current sampling metal piece, and the current wire of the electric energy meter to be tested is connected to the current transformer The primary side is connected; the voltage sampling metal piece is connected to the voltage line of the electric energy meter to be tested; The wiring plug includes a hand-held part, a current sampling plug connected to the current input end and the current output end of the on-site calibrator, a voltage sampling plug connected to the voltage input end of the on-site calibrator and an insulating plug; the current The sampling plug, the voltage sampling plug and the insulating plug are fixed on the handle; The current sampling plug is inserted into the wiring socket through the current sampling jack, and is movably connected with the current sampling metal part; the voltage sampling plug is inserted into the wiring socket through the voltage sampling jack, and connected to the wiring socket. The above-mentioned voltage sampling metal parts are connected flexibly. In order to prevent the secondary side of the current transformer from being open, the non-conductive insulating plug is slightly shorter than the current sampling plug, and the insulating plug is inserted into the two connected current sampling metal parts through the insulating jack. between. 2. The junction box according to claim 1, wherein the current transformer is a feedthrough current transformer. 3 . The junction box according to claim 1 , wherein the current sampling metal piece and the voltage sampling metal piece are beryllium copper shrapnel metal pieces. 4 . 4. The junction box according to claim 1, wherein a card slot is provided at the bottom of the socket housing; the wiring socket is fixed to the inside of the metering cabinet where the electric energy meter to be measured is located through the card slot, and the The wiring plug is placed outside the metering cabinet.