RU45569U1 - POWER BRANCHING BOX - Google Patents

Abstract

The utility model relates to electrical products, in particular, to junction terminal boxes and is designed for operation in three-phase AC circuits with a grounded neutral transformer with voltage up to 60 V, frequency 50 and 60 Hz for current up to 63 A in conditions of explosive rooms and outdoor installations of chemical enterprises and the petrochemical industry in explosive environments. The technical result that can be obtained using the proposed utility model is to increase the electrical parameters, namely, rated current, rated voltage, cross-section of connected conductors, cable diameter, to increase the reliability of electrical connection of conductors, resistance to cyclic temperature changes, explosion safety and dustproof. The power branch box (RED) consists of a housing 1, a cover (not shown conventionally in Fig.), Cable entries 2, a terminal block 3 with four current-carrying buses 4, made of insulating material with a grounded neutral transformer (not shown in Fig.) And installed inside the housing 1, while the housing 1 with a cover and cable entries 2 are provided with gaskets (not shown in FIG.). Moreover, the gaskets in the cable entries 2 are made in the form of elastic rings (not shown in Fig.). The housing 1 is mounted on the frame 5 with the possibility of mounting the box during operation. The cable cores are connected to the current-carrying busbars 4 by means of contact clips 6. The box contains internal grounding clamps 7 and external grounding clamps 8.

Description

The technical field to which the utility model relates.

The utility model relates to electrical products, in particular to junction terminal boxes, and is intended for operation in three-phase AC circuits with a grounded neutral transformer of voltage up to 60 V, frequencies of 50 and 60 Hz for current up to 63 A in conditions of explosive rooms and outdoor chemical and petrochemical plants industry in explosive environments.

State of the art

Known electrical distribution bus, the essence of which lies in the fact that the flexible conduit includes a flexible insulating plastic housing of constant cross section. The specified housing has a predominantly rectangular shape with three recesses facing one side of the housing. At the bottom of each recess is a conductor representing a copper wire. A knife contact is connected to the wire along its entire length, electrically connected to the wire and forming a double spring knife contact. A recess is located on the opposite side of the housing. When the conduit is bent in the lateral direction, the recesses are compressed, contributing to bending (see RF Patent No. 2107372, CL N 02 G 5/04, H 01 R 25/14, H 02 B 1/20, publ. 03.20.1998) .

The disadvantage of this tire is the design complexity and low reliability.

Known general-purpose connections and junction boxes, which have a number of conclusions on which the greatest increase in temperature occurs. To these conclusions are connected wires of maximum cross section. The length of the wire connected to each terminal and placed inside the case must correspond to the maximum internal size (triple diagonal length) of the case. The connection is carried out in such a way that the test current passes through the terminal and wires connected in series (see Electrical Equipment

explosion proof. Part 7. Protection of the species e. GOST R 51330.8-99, Moscow).

The disadvantage of this general purpose connection and junction box is its low reliability.

The closest in technical essence and the achieved positive effect and accepted by the authors for the prototype are junction boxes of the SRO-1/500 V type consisting of a housing, a cover, cable entries, a terminal block with busbars installed inside the housing and grounding clamps (see the catalog sheet. Branch boxes type SRO. PKIMSA "CARBOAUTOMATIKA" JSC 43-100 Tychy, 168 Budovlyany St., Poland).

The drawbacks of these boxes are low electrical parameters: the rated current is 25A and 50 A, the rated voltage is 250V and 500V, the maximum cross-section of connected conductors is 10 mm ² , and the maximum cable diameter is 23 mm.

Utility Model Disclosure

The technical result that can be obtained using the proposed utility model is to increase the electrical parameters, namely, rated current, rated voltage, cross-section of connected conductors, cable diameter, to increase reliability

electrical connection of conductors, resistance to the effects of cyclic changes in temperature, explosion safety and dust tightness.

The technical result is achieved using a power branch box containing a housing with a cover, cable entries, a terminal block with busbars and grounding electrical clamps installed inside the housing, while the terminal block is made of insulating material with a grounded transformer neutral, and the housing with a cover and cable entries gaskets, and gaskets in the cable entries are made in the form of elastic rings, while the housing is mounted on the frame with the possibility of mounting boxes, and grounding clamps Execute both internal and external.

Brief Description of the Drawings

In FIG. given box power branching (cattle), General view, a section along aa.

Utility Model Implementation

The power branch box (RED) consists of a housing 1, a cover (not shown conventionally in Fig.), Cable entries 2, a terminal block 3 with four current-carrying buses 4, made of insulating material with a grounded neutral transformer (not shown in Fig.) And installed inside the housing 1, while the housing 1 with a cover and cable entries 2 are provided with gaskets (not shown in FIG.), and the gaskets in cable entries 2 are made in the form of elastic rings (not shown in FIG.). The housing 1 is mounted on the frame 5 with the possibility of mounting the box during operation. The cable cores are connected to live busbars 4 through contact

clamps 6. The box has internal grounding clamps 7 and external grounding clamps 8.

Power distribution box is operated as follows.

The box is attached using the frame 5. When installing the box, the cable (not shown in Fig.) Is inserted into the box through the cable entries 2, sealed with elastic rings. The maximum outer diameter of the cable is 28 mm. The cable cores are connected to the current-carrying busbars 4 made of insulating material by means of contact clamps 6. Each bus has four contact clamps 6 providing for the connection of cable cores with a cross section from 6 mm ² to 25 mm ² . The safety of staff is carried out by internal and external grounding clamps 7 and 8. At the junction of the housing 1 with the cover and cable entries 2 there are gaskets to protect against dust and moisture.

The box has an explosion-proof design and explosion protection marking 2Excell 5:

- explosion protection level “2” - “electrical equipment of increased reliability against explosion”,

- types of explosion protection - protection of type "e" according to GOST R 51330.8-99.

Explosion protection level “2” - “electrical equipment of increased reliability against explosion” and type of protection type “e” is provided by the following main measures and means:

- the conclusion of non-sparking live parts in the shell of the box, made and in accordance with the requirements of GOST R 51330.0-99, which has a high degree of protection against the danger of mechanical damage;

- the implementation of electrical contact clamps in accordance with the requirements of GOST 10434-82, designed for a current density of not more than 2.5 A / mm ² and providing high reliability of contact;

- compliance with electrical insulation level 1 according to GOST R 51330.8-99;

- the degree of protection of the shell from external influences IP 65;

- limiting the heating of the outer parts of the switch shell: the temperature does not exceed 100 ° C, the heating temperature of the internal parts does not exceed 65 ° C in the nominal operating mode;

- providing reliable cable sealing with an input device;

- the presence on the lid of the explosion protection marking and the warning sign "Open, unplugged from the network" (not shown in Fig.);

- the presence of external and internal grounding modes;

- using DMC-20-OPMT premix insulation material, the minimum creepage distances do not exceed 16 mm, and the electrical clearances do not exceed 10 mm.

The proposed utility model in comparison with the prototype and other well-known technical solutions has the following advantages:

- high reliability of electrical connection of conductors;

- increase in electrical parameters;

- resistance to the effects of cyclic temperature changes;

- explosion proof and dustproof.

Claims (1)

Power junction box containing a housing with a cover, cable entries, a terminal block with busbars and grounding electrical clamps installed inside the case, characterized in that the terminal block is made of insulating material with a transformer grounding neutral, and the housing with a cover and cable entries are provided with gaskets, moreover the gaskets in the cable entries are made in the form of elastic rings, while the case is mounted on the frame with the possibility of attaching the box, and the grounding clamps are made internal and external and.