JPS631403Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to the operation indication of circuit breakers and breakers, and in particular, to circuit breakers and breakers that have multiple tripping parts such as electronic overcurrent tripping elements and earth leakage tripping elements. The present invention relates to an operation display device.

FIG. 1 shows the configuration of a conventional circuit breaker having an electronic overcurrent tripping element. The sheathing mechanism 1 is an instantaneous tripping device 2 or a voltage tripping device 3.
is configured to open the contacts by.

The instantaneous trip device 2 is instantaneously driven by a large current such as a short circuit flowing in the main circuit to cause a tripping operation, and usually an electromagnetic device that is directly excited by the fault current is used. ing.

The voltage trip device 3, via the rectifier circuit 4,
Under the control of the switching element 5, a circuit voltage E is applied to cause a tripping operation, and in this example, it is driven in response to fault currents of overcurrent and leakage. In other words, if an overcurrent that exceeds the rated operating current but does not operate the instantaneous trip device 2 flows, it is converted to a signal voltage level by the current transformer 6 and the overcurrent is After a delay time commensurate with the magnitude of the voltage level, the switching element 5 is made conductive by the tripping section 7, and the voltage tripping device 3 is energized.

In addition, if a leakage current flows, this should be connected to the ZCT
8 converts it into a signal, and the earth leakage trip unit 9 waits for a necessary delay time depending on the magnitude of the signal, makes the switching element 5 conductive, and energizes the voltage trip device 3. .

As mentioned above, in the example of Figure 1, short circuit, overcurrent,
It can detect and cut off fault currents such as electrical leakage. Furthermore, by adding the ability to prevent an open-phase accident or a reverse-phase accident, or to prevent a disconnection, a plurality of tripping elements can be provided.

Conventional circuit breakers and breakers have a problem in that the cause of the accident cannot be determined after the circuit breaks. In other words, circuits and disconnectors are usually turned on or off by tilting the operating handle, etc.
It is possible to determine the state of OFF, TRIP (trip), etc., but when it is in the TRIP state, it is not possible to determine which element among the multiple trip elements is the cause. Nakatsuta.

In case of earth leakage or disconnection, voltage trip device 3
The mainstream is to use a display button 10 linked to the voltage trip device 3 to distinguish between an overload short-short fault and an earth leakage fault. 10 can also be used, but in this case, the voltage trip device 3 is commonly used for both overcurrent tripping and earth leakage tripping, so this display button can be used to determine overcurrent and earth leakage accidents. I can't.

In order to distinguish and display overcurrent and earth leakage accidents, it is necessary to use voltage trip devices 3 and 11 corresponding to each trip element, as shown in Figure 2. In this case, two voltage trip devices are required, and it is difficult to store them in circuits and disconnectors where storage space is limited.

In view of the problems of the prior art, it is an object of the present invention to provide a circuit breaker or breaker having a plurality of tripping elements, in which the cause of an accident can be clearly determined after the circuit breaker or breaker operates. Its purpose and characteristics are that it has a switching element corresponding to each trip element, and an operation display driver is connected in series between a voltage trip device that is commonly driven by the switching elements. , the display corresponding to each trip element is caused by the drive unit.

The present invention will be explained with reference to an embodiment shown in FIG. Items with the same number indicate the same parts. When an overcurrent flows, it is converted to a signal level by the current transformer 6, and the overcurrent tripping section 7 conducts the switching element 12, which is the first switching element, and the voltage tripping device 3. Drive.

In addition, if a leakage current flows, this should be connected to the ZCT
8 converts it into a signal, compares its magnitude with the earth leakage tripping section 9, makes the switching element 13 which is the second switching element conductive, and drives the voltage tripping device 3.

Switching element 12 that becomes conductive when an overcurrent occurs
and a switching element 1 that becomes conductive when an earth leakage occurs.
3 and the voltage trip device 3, there is a rectifier circuit 4, a first drive coil AB14 of the first operation display drive section, and a second drive coil AB14 of the second operation display drive section.
drive coils CD15 are connected in series.

FIG. 4 shows a specific example of the operation display device.

The operation display drive unit includes a first yoke 19, a second yoke 20, and a yoke 18, which are each formed into a substantially U-shape and are provided at an angle of about 120 degrees to each other, and a U-shaped yoke of each yoke. The first yoke 19 and the second yoke are composed of a rotary shaft 16 rotatably provided through the bottom and a rotatable permanent magnet 17 fixed to the rotary shaft 16.
Each of the yokes 20 has a first drive coil AB
14 and a second drive coil CD15 are wound. Normally, permanent magnet 17 is
is in close contact with the yoke 18 and is stable in this state. At this time, the display piece 21 indicates short circuit characters.

Due to overcurrent, switching element 1 in Fig. 3
2 becomes conductive, thereby operating the circuit breaker, the voltage trip device 3 is driven and at the same time, the drive coils AB to 14 are energized. Therefore, in FIG. 4, the yoke 19 around which the drive coils AB-14 are wound is excited, and the permanent magnet 17 is attracted to the yoke 19 and changes its direction.

Also, leakage current flows and the switching element 1
3 is conductive, the drive coil CD~15 is energized, the yoke 20 is excited, the permanent magnet 17 is attracted to the yoke 20, and its direction is changed. Both the drive coils 14 and 15 are not energized and the tripping device 3
is considered to be a short circuit. Rotating axis 1
6, a display piece 21 is fixed, and the display piece 21 changes its direction according to the movement of the permanent magnet. The nameplate 22 shows the movement of the permanent magnet 17 to the position corresponding to the yoke 18, 19, 20, and after the shearing operation, the tripping element can be identified from the outside. As described above, according to the present invention, the following effects are obtained. The cause of the operation can be clearly determined after a circuit or disconnector having a plurality of tripping elements is tripped.

[Brief explanation of the drawing]

Fig. 1 is a conventional internal connection diagram, Fig. 2 is an internal connection diagram for obtaining an operation display corresponding to the tripping element in the conventional example, and Fig. 3 is an internal connection diagram of the embodiment of the present invention. , FIG. 4 is a front view showing a specific example of the operation display drive unit according to the embodiment of the present invention, FIG. 5 is a side view thereof, and FIG. 6 is a front view of the display piece and nameplate. 3; Tripping device, 7.9; Tripping portion, 12.1
3; switching element; 14-20; operation display drive unit; 14 and 15; drive coil; 21; display piece.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. An overcurrent tripping section that detects an overcurrent in an electric circuit and generates a tripping signal, an earth leakage tripping section that detects a current leakage and generates a tripping signal, and the above-mentioned overcurrent. a first switching element that is connected to the tripping section and becomes conductive in response to a tripping signal when an overcurrent occurs; a second switching element that is connected to the earth leakage tripping section and becomes conductive in response to a tripping signal when an earth leakage occurs; A tripping device that is energized when at least one of a first switching element and a second switching element becomes conductive; and a shredding mechanism that opens an electric circuit based on the operation of the tripping device. A first operation display drive section connected in series to the first switching element, and a second operation display drive section connected in series to the second switching element. and a display piece that is energized based on the operation of at least one of the first operation display drive unit and the second operation display drive unit, the display piece being energized based on the operation of the overcurrent tripping unit. and an operation display device for a circuit breaker, characterized in that it is configured to display which of the earth leakage tripping parts has operated. 2 The first operation display drive section and the second operation display drive section each include a first drive coil connected in series to the first switching element and a first drive coil around which the first drive coil is wound. a yoke, a second drive coil connected in series to the second switching element, and a second yoke around which the second drive coil is wound,
The display piece is made of a magnetic material and the display piece is made of a magnetic material.
and the second drive coil, and is configured to be attracted to either the first drive coil or the second drive coil. A device for displaying the operation of a circuit breaker as claimed in claim 1.