Summary of the invention
In view of this, the object of the invention is to provide a kind of pluggable safety junction box for site calibration of electric energy meter, the potential safety hazard of existing terminal box existence of opening a way to avoid the secondary current loop in use procedure, overcome.
For achieving the above object, the invention provides following technical scheme:
A kind of pluggable safety junction box for site calibration of electric energy meter, comprises connector socket and connection plug;
Described connector socket comprises jack housing, and is placed in current transformer, current sampling metalwork and the voltage sampling metalwork in the cavity that formed by described jack housing;
Described jack housing is provided with current sampling jack, voltage sampling jack and insulation jack; Described Current Transformer Secondary side is connected with described current sampling metalwork, and the current line of electric energy meter to be measured is connected with described current transformer primary side; Described voltage sampling metalwork is connected with the pressure-wire of electric energy meter to be measured;
Described connection plug comprises Handheld Division, the current sampling plug be connected with current input terminal and the current output terminal of on-site calibrator, the voltage sampling plug be connected with the voltage input end of described on-site calibrator and blind plug; Described current sampling plug, voltage sampling plug and blind plug are fixed on described Handheld Division;
It is inner that described current sampling plug inserts described connector socket by described current sampling jack, is flexibly connected with described current sampling metalwork; It is inner that described voltage sampling plug inserts described connector socket by described voltage sampling jack, is flexibly connected with described voltage sampling metalwork.
Preferably, described current transformer is straight-through current transformer.
Preferably, described current sampling metalwork and voltage sampling metalwork are beryllium copper shell fragment metalwork.
Preferably, draw-in groove is provided with bottom described jack housing; Described connector socket is fixed on the inside of the metering cabinet at electric energy meter place to be measured by described draw-in groove, described connection plug is placed in the outside of described metering cabinet.
As can be seen from above-mentioned technical scheme, the present invention is by the primary side of the secondary current loop of electric energy meter to be measured access current transformer, by current sampling metalwork, voltage sampling metalwork, on-site calibrator is accessed the secondary side of current transformer by current sampling plug and voltage sampling plug, responded to by the electric current of current transformer, on-site calibrator is made to get electric current and the voltage of electric energy meter to be measured, do not need on-site calibrator directly to be accessed electric energy meter secondary current loop to be measured, thus the secondary circuit of electric energy meter to be measured is opened a way the electrical network that causes when having stopped to verify wiring, equipment and personal safety hidden danger.And all kinds of sampling metalwork is encapsulated in plug body, outside not being exposed to, verification personnel are stopped because of the accident potential abutting against line terminals or be with some loop and get an electric shock by mistake.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
The embodiment of the invention discloses a kind of pluggable safety junction box for site calibration of electric energy meter, open a way to avoid the secondary current loop in use procedure, overcome the potential safety hazard of existing terminal box existence.
With reference to Fig. 1 ~ 3, the pluggable safety junction box for site calibration of electric energy meter that the embodiment of the present invention provides, comprises connector socket 1 and connection plug 2;
Connector socket 1 comprises jack housing 11, current transformer 12, current sampling metalwork 13 and voltage sampling metalwork 14, jack housing 11 forms a totally enclosed cavity, current transformer 12, current sampling metalwork 13 and voltage sampling metalwork 14 are all placed in this cavity, and current sampling metalwork 13 is fixedly connected with jack housing 11 by nut 05 with voltage sampling metalwork 14;
Jack housing 11 is provided with current sampling jack 15, voltage sampling jack 16 and insulation jack 17; Current transformer 12 secondary side is connected with current sampling metalwork 13, and the current line 01 of electric energy meter to be measured is connected with the primary side of current transformer 12; Voltage sampling metalwork 14 is connected with the pressure-wire of electric energy meter to be measured;
Connection plug 2 comprises Handheld Division 24, the current sampling plug 21 be connected with current input terminal 02 and the current output terminal 03 of on-site calibrator, the voltage sampling plug 22 be connected with the voltage input end 04 of on-site calibrator and blind plug 23; Current sampling plug 21, voltage sampling plug 22 and blind plug 23 are fixed on Handheld Division 24;
It is inner that current sampling plug 21 inserts connector socket 1 by current sampling jack 15, is flexibly connected with current sampling metalwork 13; It is inner that voltage sampling plug 22 inserts connector socket 1 by voltage sampling jack 16, is flexibly connected with voltage sampling metalwork 14.
Because connector socket is connected with tested electric energy meter all the time, current transformer 12 primary side has electric current to flow through all the time, open a way for preventing its secondary side, nonconducting blind plug 23 is slightly shorter than current sampling plug 21, make: when connection plug 2 does not insert connector socket 1, two the current sampling metalworks 13 be connected with same current transformer 12 contact with each other (in Fig. 2,06 is the two contact site), make the secondary circuit short-circuit of straight-through current transformer 12, as shown in Figure 2; When connection plug 2 inserts in the process of connector socket 1, current sampling metalwork first contacts with current sampling plug, and (the current sampling path namely as the load of current transformer 12 secondary side is first connected, as shown in Figure 4), blind plug 23 inserts between two current sampling metalworks 13 being connected to each other again, it is made to disconnect, as shown in Figure 5.
From the structure elder sister circuit connecting mode of above-mentioned pluggable safety junction box for site calibration of electric energy meter, the embodiment of the present invention is by the primary side of the secondary current loop of electric energy meter to be measured access current transformer, by current sampling metalwork, voltage sampling metalwork, on-site calibrator is accessed the secondary side of current transformer by current sampling plug and voltage sampling plug, responded to by the electric current of current transformer, on-site calibrator is made to get electric current and the voltage of electric energy meter to be measured, do not need on-site calibrator directly to be accessed electric energy meter secondary current loop to be measured, thus the secondary circuit of electric energy meter to be measured is opened a way the electrical network that causes when having stopped to verify wiring, equipment and personal safety hidden danger.And all kinds of sampling metalwork is encapsulated in plug body, outside not being exposed to, verification personnel are stopped because of the accident potential abutting against line terminals or be with some loop and get an electric shock by mistake.
Concrete, the current transformer 12 in above-described embodiment can adopt straight-through current transformer, and the current line of electric energy meter to be measured, through this straight-through current transformer, can realize the connection with current transformer primary side.
Further, because tested electric energy meter is three-phase and four-line electric energy meter, therefore straight-through current transformer 12 has 3, passed by A, B, C three-phase electricity streamline respectively, current sampling metalwork 13, current sampling jack 15, current sampling plug 21 all have 6, wherein 3 input for electric current, and other 3 export for electric current; Voltage sampling metalwork 14, voltage sampling jack 16 and voltage sampling plug 22 all have 4, are respectively used to the connection of A, B, C three-phase electricity line ball and zero line; Insulation jack 17 and blind plug 23 are 3.
For convenience of plug and play, said elements can arrange by mode shown in Fig. 6,111 ~ 113 corresponding 3 current sampling metalworks 13 connected from different straight-through current transformer secondary side one end, or 3 current sampling jacks 15, or 3 current sampling plugs 21, input for electric current; 201 ~ 204 corresponding 4 voltage sampling metalworks, or 4 voltage sampling jacks, or 4 voltage sampling plugs; The contact site 06 of 121 ~ 123 corresponding 3 two current sampling metalworks 13 be connected with same straight-through current transformer 12, or 3 insulation jacks 17, or 3 blind plugs 23; 131 ~ 133 all the other 3 current sampling metalworks 13 corresponding, or all the other 3 current sampling jacks 15, or all the other 3 current sampling plugs 21, export for electric current.
Visible, the terminal box described in the embodiment of the present invention adopts the access way of plug-socket, does not need any aid during verification wiring; Patching operations (being connected with connector socket by electric energy meter to be measured) is had when only first time installs, during verification, only need all kinds of sampling plugs etc. be inserted in connector socket by sampling jack, all kinds of sampling plug can be made to be connected with corresponding sampling metalwork, realize the access of on-site calibrator, simple to operate, reduce the operant level requirement to verification personnel, reduce and even stopped false wiring.
Further, in other embodiments of the present invention, the current sampling metalwork 13 in above-described embodiment and voltage sampling metalwork 14 specifically can adopt beryllium copper shell fragment metalwork.
Further, in other embodiments of the present invention, draw-in groove 07 is provided with bottom the jack housing 1 in above-mentioned all embodiments, as shown in Figure 7, for connector socket 1 being fixed on the inside of the metering cabinet at electric energy meter place to be measured, connection plug 2 is placed in the outside of described metering cabinet.
Wire base is fixed on metering cabinet inside by the above embodiment of the present invention, and the current return of electric energy meter and the lead-in wire of voltage circuit all do not expose metering cabinet, therefore only otherwise open metering cabinet, just cannot disconnect by the short circuit of electric energy meter current loop or by voltage circuit; And electric current and the voltage of electric energy meter is obtained by the electric current induction of the straight-through current transformer in wire base, the short circuit of current return is carried out also just by the secondary circuit short-circuit of straight-through current transformer by wire base, cannot to the short circuit of current loop of electric energy meter, also cannot off voltage loop.Therefore, the stealing hidden danger stopped of the above embodiment of the present invention.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.