CN2758775Y

CN2758775Y - Current transformer terminal button box and electric energy meter terminal button box

Info

Publication number: CN2758775Y
Application number: CN 03264976
Authority: CN
Inventors: 盛泉根
Original assignee: Huali Group Co ltd
Current assignee: Holley Technology Co Ltd
Priority date: 2003-06-30
Filing date: 2003-06-30
Publication date: 2006-02-15
Anticipated expiration: 2013-06-30

Abstract

The utility model relates to a current transformer terminal button box and an electric energy meter terminal button box, which are mainly used for the technical field of low-voltage electric appliances and electric meters. The utility model comprises a current transformer, wherein the leading wire part of a primary winding of the current transformer is a current guiding plate of a terminal button, and the circumference of the non-wiring part of the current guiding plate is a brass jacket which is matched with a compression screw which can be screwed on and screwed off. The utility model has the advantages that two connection points are decreased to one connection point, which avoids the defect that original connection is provided with two connection points, reduces heat productivity and improves the security of electric appliances and distribution wires.

Description

Current transformer ramp box and connection box of electric energy meter terminal box

Technical field:

The utility model mainly applies to low-voltage electrical apparatus and electrical instrument field, belongs to the ramp structure and makes the field.For example, the ramp or the terminal box that can be used for electric energy meter.In addition, also can be used for low-voltage electrical apparatus (as low-voltage electrical apparatuses such as contactors).

Background technology:

In the prior art, the once lead-in wire of current transformer is compressed by screw with fair water fin and is connected, and fair water fin is connected with distribution line again (generally also with compressing mode).Will pass through two contact points during like this electrical equipment or meter in circuit.Facts have proved that electric terminal is to make circuit generate heat, cause one of major reason of safety problems such as burning.For example, for the wiring of electric energy meter, as shown in Figure 1, two contacts are just arranged.When electric current such as 100A were above greatly, the power consumption of each contact, heating all can not be ignored.

Summary of the invention:

Purpose of design: avoid the weak point in the background technology, overcome its distribution line electric terminal many, cause problem such as heating easily, thereby the security that improves distribution line.In all distribution lines, be crucial in the distribution line of big electric current particularly.

Design proposal: facts have proved that heating is mainly caused by contact in the circuit, and is not to cause heating by this electric line itself (sectional area of general conductor is enough), is crucial so reduce contact.The application is from reducing this key of contact, original two electric terminals are reduced to one, reaching problems such as having reduced pyrotoxin by reducing contact.General distribution wire is exhaled and always will be connected with electrical equipment, so a contact is absolutely necessary, but another contact can remove under many circumstances.The application's inventive point is: the lead-in wire and the fair water fin of a winding of current transformer are integrated, it directly are connected with distribution line, thereby have reduced by a contact.Its technical scheme: 1. current transformer ramp box, it comprises current transformer, a winding leads portion (3) of mutual inductor is the fair water fin of ramp.Around the non-wire connecting portion of fair water fin (3) is brass bushing (6), holds out against screw (7) and brass bushing and is complementary and can screws on, screw off.2. the connection box of electric energy meter terminal box by fair water fin (3), brass bushing (6), hold out against screw (7) and terminal box (4) and constitute, brass bushing (6) is positioned at terminal box (4), hold out against screw (7) and be screwed in brass bushing (6) and be used to hold out against the distribution lead (5) that is positioned on the fair water fin (3), fair water fin (3) and brass bushing (6) conducting.

The utility model is compared with background technology, and two contacts are reduced to a contact, has greatly avoided original connection to have the weak point of two contacts.If the resistance of a contact is r, the electric current that passes through is I, and then the heat of Chan Shenging is I ²R is because electric current is bigger, though the very little thermal value of r is also very big.In background technology, being connected with electrical equipment generally to have two such contacts, and thermal value is just bigger.The application is reduced to a contact to two contacts, makes thermal value reduce the security that has improved electrical equipment and distribution line.

Description of drawings:

Fig. 1 is the structural representation (connections of two contacts) of background technology.

Fig. 2 is a structural representation of the present utility model;

Fig. 3 is the structural representation that the utility model applies to electric energy meter terminal box.

Fig. 4 is the fit structure synoptic diagram of the utility model and tight-holding type terminal box:

Embodiment:

Embodiment 1: be example with the electric energy meter, its principle and structure are as shown in Figure 2.A winding of its mutual inductor is exactly a fair water fin 3, and it not only passes transformer iron core 1, and directly draws as fair water fin, can directly be connected with distribution line.Have only a contact now, that is exactly the contact of fair water fin 3 and distribution wire.

Embodiment 2: the terminal box that the utility model is used for electric energy meter, reduced from entering the impedance of terminal to the ammeter current return of drawing terminal, thereby reach the power consumption that reduces ammeter inside and and the heating of external power junction, improved security performance.Concrete structure such as Fig. 2, shown in Figure 3.In Fig. 2, the 1st, the iron core of current transformer; The 2nd, the shell of current transformer; The 3rd, a winding of current transformer, the fair water fin that promptly is integral; The 4th, terminal box; 5 is the distribution lead; The 6th, brass bushing; The 7th, hold out against screw.The current transformer current-carrying plate is made by red copper, and it is again a winding of mutual inductor; Fair water fin is placed in the brass bushing, after the multiply line of electric force enters in the brass bushing, holds out against with holding out against screw again.Screw head is the plane, and area reaches 27 square millimeters, makes the multiply electrical lead contact with fair water fin or contact with fair water fin by brass bushing and screw (being made by brass) again up and down or directly.Being connected as shown in Figure 3 of current transformer and terminal, among the figure, three current transformers are combined, six of three windings lead-in wire fair water fins directly and terminal box link together.

Embodiment 3: Fig. 4 is the utility model and " tight-holding type ramp " granted patent) cooperate a kind of novel terminal box of forming, its fair water fin 3 is the contact of distribution wire.

Claims

1, a kind of current transformer ramp box, it comprises current transformer, it is characterized in that: the fair water fin (3) of a winding of mutual inductor is positioned at the ramp cover of ramp box.

2, current transformer ramp box according to claim 1 is characterized in that: around the non-wire connecting portion of fair water fin (3) is brass bushing (6), holds out against screw (7) and brass bushing and is complementary and can screws on, screw off.

3, a kind of connection box of electric energy meter terminal box, its feature by fair water fin (3), brass bushing (6), hold out against screw (7) and terminal box (4) and constitute, brass bushing (6) is positioned at terminal box (4), hold out against screw (7) and be screwed in brass bushing (6) and be used to hold out against the distribution lead (5) that is positioned on the fair water fin (3), fair water fin (3) and brass bushing (6) conducting.

4, connection box of electric energy meter terminal box according to claim 3 is characterized in that: terminal box (4) adopts insulating material to make.