JPS63259937A - Zero phase current transformer unit for leakage breaker - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention is installed in an earth leakage breaker and connects a zero-phase current transformer and its control circuit, a control line from a primary conductor, a winding for a test circuit, etc. This invention relates to an integrated zero-phase current transformer unit.

[Conventional technology]

No conventional earth leakage circuit breaker has adopted this type of zero-phase current transformer unit as an earth leakage tripping device, and in conventional devices, each component is housed separately, as shown in the vertical cross section of Figure 6, as an example. A system that performs internal wiring is known. In the figure, the earth leakage breaker consists of a case 1 and a cover 2 that can be divided into upper and lower parts by molding synthetic resin, an electric circuit component 3 housed in the case and cover 1.2, and an opening/closing mechanism 4 that opens and closes its contacts. and an earth leakage tripping device 5 which detects a ground fault when it occurs in the external load circuit of the circuit component 3 and operates to cut off the circuit section, and a ground leakage tripping device 5 which detects an overcurrent in the circuit component 3. It is composed of an overcurrent tripping device 6 that operates to cut off the electric circuit component 3. The earth leakage tripping device 5 has a three-phase primary conductor 21 made of a flexible conductor that connects the movable contact 11 of the electric circuit component 3 and the excitation coil 12 of the overcurrent tripping device 6.
and a zero-phase current transformer 22 through which the three-phase primary conductor 21 passes all at once.
, a printed wiring board unit 23 equipped with a control circuit mainly for amplifying the output of the zero-phase current transformer 22, and a test circuit coil and its contacts (not shown).

It is composed of a voltage application trip coil unit and the like, and after each of these is incorporated into a case and a cover 1.2, predetermined wiring processing is performed by soldering.

[Problem that the invention seeks to solve]

With such conventional equipment, the wiring work by soldering is done manually, which requires more time than the assembly work of other structural parts, and the line speed of the assembly line must be slowed down or in order to match the assembly work. Many soldering methods have the disadvantage of requiring the presence of an operator. Furthermore, when storing the connection wires in the case 1 after soldering, due to the large number of connection wires, it is not always possible to store them in the same shape in a limited space, and sometimes the connection wires may not be stored in the case 1. There was also a quality defect in that 7 could be pushed from the inside and cause peeling.

The purpose of this invention is to eliminate the above-mentioned conventional drawbacks, and to eliminate soldering work on the main body assembly line, to ensure the same line speed as the time required for assembling other structures, and to eliminate the need to push connection wires. An object of the present invention is to provide a zero-phase current transformer unit for an earth leakage breaker that does not cause quality deterioration.

[Means for solving problems]

In order to achieve the above-mentioned object, the present invention provides a synthetic resin molded case and cover, which is divided into two into a rectangular box shape and houses a zero-phase current transformer, and the case.

A group of terminals to which a primary conductor that passes through the zero-phase current transformer is connected, which is sandwiched between the joint surface on one side of the cover, and an output end of the zero-phase current transformer that is installed in the opening on the other side of the case and the cover. The present invention includes a jack assembly to which control lines from the test coil end and the primary conductor are connected, respectively, and a printed circuit board mounted with a control circuit connected to the jack assembly via a connection plug.

[Effect]

The zero-phase current transformer unit of the earth leakage breaker according to the present invention houses a zero-phase current transformer, and a group of terminals connected to a primary conductor passing through the zero-phase current transformer is sandwiched between a case and a cover, A jack assembly is included to which the output end of the zero-phase current transformer, the test coil end, and the control line from the primary conductor are connected, so the main circuit conductor and applied voltage to this zero-phase current transformer unit are connected. Connection to the emitter is made by tightening screws to the terminal group, and connection to a test button for a test circuit, etc. is made by inserting a plug into the jack assembly.

〔Example〕

1 to 5 are diagrams showing an embodiment of the zero-phase current transformer of the earth leakage breaker according to the present invention, and FIG. Figure 4 shows the case of a zero-phase current transformer unit.

FIG. 5 is a front view on the primary terminal side, a top view, and a front view on the jack side of the portion housed in the cover. FIG. 5 is a plan view showing the internal structure of the zero-phase current transformer unit. In the figure, the same parts as those of the conventional apparatus shown in FIG. 6 described above are given the same reference numerals, and the differences will be explained. The difference between this embodiment and the conventional device is that the main part of the earth leakage breaker device 5 is housed in the space where the main parts of the earth leakage breaker device 5 are housed, and the connection to the electrical circuit component 3 is accomplished by simply tightening the screws and fitting the connector into the lid. The zero-phase current transformer and related parts are made into a unit that can be connected to both connection, trip, and test circuits, and soldering on the main body assembly line is eliminated. The zero-phase current transformer unit 30 has a case 3 that can be divided into upper and lower halves by molding synthetic resin.
1. The part housed in the cover 32 and the case 31. The cover 32 is made up of a portion that is connected from outside the cover 32 via a connector.

Case 31. Inside the cover 32, as shown in FIG. 5, there is a through-type zero-phase current transformer 33, and a
Primary conductors 34a, 34b, 34c of the phases and primary conductor 34
The case 31.a, 34b, and 34c are connected to both ends of the case 31. Terminal groups 35a and 35b that can be held on one joint surface of the cover 32
, 35c; 36a, 36b, 36c and case 31
, and a jack assembly 37 installed so as to look into the opening on the other side of the cover 32. And case 31. Between the jack of the jack assembly 37 in the cover 32,
The output ends 33a and 33b of the zero-phase current transformer 33, the test circuit coil 38 that passes through the zero-phase current transformer 33, and the primary conductor 3
Control lines 39a and 39c (also used as a control power source) from 4a and 34c are connected to a crossover wire 40a to the applied voltage trip circuit and a crossover wire 40b to the test circuit, respectively. On the other hand, case 31. Jack assembly 37 from outside the cover 32
The one that is plug-connected to is equipped with a plug 41 that is connected to the output ends 33a, 33b of the zero-phase current transformer 33, control lines 39a, 39b, etc., and a printed circuit board 42 on which a control circuit including an amplifier is mounted. , control line 39a and printed circuit board 4
2, a voltage trip connection line 43 connected to a trip coil (not shown), a control line 39b, and a test circuit coil 3.
There is a plug 41 connected to one end of the push button 8, and a test circuit connection line 44 connected to a contact point located below the push button 8 in FIG. 1 via a resistor.

To install the earth leakage breaker of the zero-phase current transformer unit 30 into the case 1, insert it from the back side of the case 1 with the case 31 facing upward, and first connect the terminals 36a and 36b.

36c is fixed to the connection plate 13 fixed to each of the excitation coil terminals 12a of the device 6 with the screw 14, and then the flexible contact plate 13, one end of which is fixed to the movable contact 11, is attached to the terminals 35a, 35b, 35c. A screw 14 on each of the conductors 15
By connecting, it is connected to the electric circuit component 3 and fixed within the case l. Zero-phase current transformer unit 3
0 via the plug 41 to the printed circuit board 42. A connection line 43 for the applied voltage trip circuit and a connection line 44 for the test circuit are connected.

With the above configuration, soldering work is eliminated when assembling the zero-phase current transformer unit 30 on the main body assembly line, and there is no possibility that the connecting wire will push the back cover 7 from inside and cause quality deterioration. do not have.

〔Effect of the invention〕

According to this invention, by providing a zero-phase current transformer unit consisting of a zero-phase current transformer, a primary conductor, a terminal group, and a jack assembly, soldering work on the assembly line of the main body can be eliminated and Therefore, it is possible to provide a zero-phase current transformer unit for an earth leakage breaker that is free from quality deterioration due to back cover cracking.

[Brief explanation of the drawing]

1 to 5 are diagrams showing an embodiment of the zero-phase current transformer of the earth leakage breaker according to the present invention, and FIG. Figure 4 shows the case of a zero-phase current transformer unit. A front view on the primary terminal side, a top view, and a front view on the jack side of the part stored in the cover. Figure 5 is a plan view showing the internal structure of a zero-phase current transformer unit. Figure 6 is a diagram of the zero-phase of a conventional earth leakage breaker. It is a longitudinal cross-sectional view showing the installed state of a current transformer. 30 zero-phase current transformer, 31-case, 32 cover,
33 Zero-phase current transformer, 33a, 33b Output end, 34
a, 34 b. 34c primary conductor, 35a, 35b, 35c; 36
a, 36b. 36c terminal, 37 jack assembly, 38 test circuit coil, 39a, 39c control line (control power supply), 41 plug, 42 Punant wiring board, 43.4
4 Connection line. ■ 3! 21 layer phase change n#uni...nod figure f

Claims (1)

[Claims] 1) A synthetic resin-molded case and cover that is divided into two into a rectangular box shape and houses a zero-phase current transformer, and a primary that is sandwiched between the case and the joint surface on one side of the cover and passes through the zero-phase current transformer. a jack assembly installed in the opening on the other side of the case and cover and connected to the output end and test coil end of the zero-phase current transformer, a terminal group to which the conductor is connected, and a control line from the primary conductor, respectively; 1. A zero-phase current transformer unit for an earth leakage breaker, comprising: and a printed circuit board mounted with a control circuit connected to the jack assembly via a connection plug.