JPS6323863Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an earth leakage protection relay, and more particularly to a unitized assembly of an earth leakage protection relay.

As shown in FIG. 1, a conventional earth leakage protection relay has a first case 1 made of resin and has an earth leakage detection part 2, a mechanism part 3, a return operation part 4, an operation indicator piece 5, and an auxiliary contact 6 on the inner wall of the first case 1. Terminals 7, 7a are provided, and the terminals 7, 7a and the auxiliary contact 6 are connected by lead wires 8, 8a. On the other hand, a zero-phase current transformer 10, a test device 11, and a test circuit resistor 12 are incorporated in a second case 9 molded from a resin material corresponding to the first case 1. Each lead wire 1 is connected between the test circuit winding w ₁ of the test circuit 10, the test circuit resistor 12, the test device 11, and the terminals 13 and 13a provided on the second case 9.
4, 14a, and 14b. Further, the earth leakage detection section 2 of the first case 1 and the secondary winding w ₂ of the zero-phase current transformer 10 of the second case 9 are connected by a lead wire 15.

In the above configuration, the second case 9 is rotated in the direction of the arrow from the state shown in FIG. are mechanically connected to complete the assembly.

Therefore, the conventional earth leakage protection relay configured as described above has the following drawbacks.

(1) Assembly work cannot begin until all parts are available. In other words, it cannot be stored as an intermediate assembly part.

(2) Since the parts are separated into the first case 1 and the second case 9, and the first case 1 and the second case 9 are connected by a lead wire 15, assembly work and handling are difficult. This is extremely inconvenient.

SUMMARY OF THE INVENTION In view of the above-mentioned drawbacks of the conventional art, the present invention aims to provide an earth leakage protection relay that allows easy assembly and handling of parts.

Hereinafter, the present invention will be explained in detail with reference to an embodiment shown in FIGS. 3 and 4.

The earth leakage protection relay A according to the present invention shown in FIGS. 3 and 4 is composed of a case body 21 and three intermediate assembly parts 22, 23, and 24. The case body 21 is divided into two parts so that the main parts of the earth leakage protection relay can be stored inside.
5, 25a, this case body main body 25,
Board insertion grooves 27, 27a, 2 are provided on the inner wall of 25a.
7b and 27c are formed. In addition, a plurality of terminal mounting portions 2 are provided on the upper part of the case main body 25, 25a.
8, 28a, and an insertion portion 30 for a plurality of insertion pieces 29 formed on the cover 26.
Furthermore, screw the case body 25, 25a with screws 31, 3.
1, screw holes 32 and screw through holes 33 are formed in the case bodies 25, 25a.

The first intermediate assembly 22 is a zero-phase current transformer 10
, a secondary winding _w2 wound around the zero-phase current transformer 10, and a test circuit winding _w1 .

The second intermediate assembly part 23 includes a board 34, a test device 11 built on the board 34, an earth leakage detection section 2, a mechanism section 3, an auxiliary contactor 6, a test circuit resistor 12, an operation indicator piece, and a return. It is composed of a handle 35 that also serves as an operating piece and terminals 13 and 13a.

The third intermediate assembly part 24 is attached to the case body 2.
The cover 26 consists of a cover 26 that covers the upper part of the case body 21, and a push button 36 for the test device attached to the cover 26.
37, screw through holes 38,
38 is formed.

In the above configuration, the first, second, and third intermediate assembly parts 22, 23, and 24 are assembled separately. That is, the first intermediate assembly part 2
2, the secondary winding w ₂ and the test circuit winding w ₁ are each wound around the zero-phase current transformer 10 the required number of times, and each is extended to an appropriate length for external connection. In addition, the second intermediate assembly part 23 fixes the earth leakage detection part 2, mechanism part 3, and auxiliary contact 6 to the upper part of the board 34 with screws, connects the terminal 13a and the test device 11 with a lead wire 39, and performs a test. A lead wire 39 connects the device 11 and the test circuit resistor 12.
Connect by a. Further, the cover 26 is attached by inserting a push button 36 for operating the test device 11 into a hole provided with a preventive measure.

Intermediate assembly parts 22 each assembled in this way,
Assemble the earth leakage protection relay using 23 and 24.
That is, the secondary winding w ₂ of the zero-phase current transformer 10, the lead wires 15, 15 of the earth leakage detection section 2, one end of the test circuit winding w ₁ and the terminal 13, and one end of the test circuit winding w ₁ The lead wires 39b connected to the test circuit resistor 12 are connected to each other by soldering at four locations. Next, the board 34 to which the earth leakage detection unit 2 and the like are attached is attached to one of the case body main bodies 25 that constitutes the case body 21.
Insert the board into the board insertion grooves 27, 27a formed in the
Insert the terminals 13, 13a into the terminal mounting parts 28, 28. Thereafter, the zero-phase current transformer 10 is inserted and supported by the support portion of the case body 25. Next, case body 2
Groove 2 of the other case main body 25a constituting 1
By inserting the board 34 into the case bodies 7b and 27c, the terminals 13a are inserted into the terminal mounting portions 28a. After that, screw 31,
31, the case body main bodies 25, 25a are fixed, the cover 26 is placed over the case body 21, and the assembly is completed by fixing with the screws 37, 37.

As explained above, according to the present invention, the first intermediate assembly mainly includes the zero-phase current transformer, and the second intermediate assembly includes at least the earth leakage detection section, the mechanism section, and the test device attached to the board. and a third cover having a pushbutton attached thereto for said test device.
an earth leakage detection section of the second intermediate assembly, comprising: a case that is divided into two parts and has grooves extending opposite to each other on both side inner walls of each of the parts and into which the board is inserted; The board is inserted into the groove of the case so that the mechanical part and the test device are located in the upper part of the case, the first intermediate assembly part is housed in the lower part of the case, and the first intermediate assembly part is housed in the upper part of the assembled case. By configuring the intermediate assembly parts (3) to be installed, the assembly work is easier and easier to assemble than the conventional method where each part of the earth leakage protection relay is installed one by one inside the case body. Since the parts can be assembled into several intermediate assembly parts, there are excellent advantages such as easy handling of the parts. Since the case body is divided into two parts and the cover is also separated, it is not only convenient to work on intermediate assembly parts, but also easy to assemble the entire relay.
Furthermore, the board can be attached to the case body by simply inserting it into a groove provided in the case body, and the cover can also be attached to the case body mainly by insertion, which is convenient.

[Brief explanation of the drawing]

1 and 2 are perspective views of the case body in an open state and an assembled state, respectively, showing an embodiment of the conventional method, and FIGS. 3 and 4 are exploded perspective views showing an embodiment of the present invention. FIG. 2... Earth leakage detection section, 3... Mechanism section, 4... Return operation section, 5... Operation display piece, 6... Auxiliary contact,
10...Zero-phase current transformer, 11...Test device, 12
...Resistance for test circuit, 21 ...Case body, 2
2, 23, 24... Intermediate assembly parts, 25, 25a
...Case body main body, 27, 27a, 27b, 27
c... Board insertion groove, 26... Cover, 34... Board.

Claims (1)

[Scope of utility model registration request] a first intermediate assembly mainly comprising a zero-phase current transformer;
Divided into two: a second intermediate assembly in which at least an earth leakage detection section, a mechanism section, and a test device are attached to the board; and a third intermediate assembly consisting of a cover to which a push button for the test device is attached. and a case having grooves extending opposite to each other on both inner walls thereof and into which the board is inserted, and the earth leakage detection section, mechanism section, and test device of the second intermediate assembly are arranged in an upper layer of the case. The board is inserted into the groove of the case so as to be located at the bottom of the case, the first intermediate assembly is housed in the lower part of the case, and the third intermediate assembly is attached to the upper part of the combined case. An earth leakage protection relay featuring: