JP2770971B2 - Capacitor with security device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a capacitor provided with a security device.

Conventional technology Capacitors with conventional security devices store the capacitor element or its assembly in a case, impregnate and fill with insulating oil, etc., and use the deformation of the case due to the rise in internal pressure due to gas generated at the time of internal failure This device has a security device that cuts off the current path, and this type of security device has a great effect to prevent the expansion of accidents such as rupture of the case, oil injection, fire, etc. in case of a capacitor failure, Recently, it has been used for many capacitors.

Problems to be Solved by the Invention However, the above security devices are all incorporated in the case of the capacitor, and the operation thereof cannot be visually observed from outside. Therefore, even if an internal failure occurs and the security device operates, the security device is left unnoticed, and there is a drawback that a failure such as a decrease in power factor is generated.

Means for Solving the Problems The present invention eliminates the above-mentioned disadvantages, and enables contact signals to be taken out by the operation of a security device to enable an external alarm, display, or tripping of a capacitor from a power supply. It is intended to prevent a failure caused by not being aware of the operation of the security device.

That is, there is provided a security device that accommodates a capacitor element or an assembly thereof in one Y-connection, a △ -connection, or a single-phase connection and accommodates the same in a case, and disconnects a current path using deformation of the case due to a rise in case internal pressure when an internal failure occurs. A capacitor provided with a security device, characterized in that an auxiliary current path which is opened or closed by the operation of the security device is provided integrally with an insulating plate in addition to the main current path in the security device.

When the capacitor provided with the above-mentioned security device causes an internal failure for some reason and the internal pressure of the case rises and cuts off the current path, the operation of the security device closes or opens the auxiliary current path, and both terminals of the auxiliary current path Display connected to the
Activate the alarm function.

Embodiment A capacitor provided with a security device of the present invention will be described with reference to an embodiment based on the drawings.

FIG. 1 shows an example of the internal connection of a capacitor according to the present invention. In a case 2, there is a unit 1 of an element assembly connected by a △ connection, which is connected to a lead-out terminal 21 via a security device 4. ing. The security device 4 is provided with an auxiliary current path 43 which is opened (or closed) by the operation of the security device 4 and integrated with an insulating plate, in addition to the main current path 42 cut by deformation of the case. Both terminals of the passage are connected to an auxiliary lead-out terminal 22.

2 and 3 are a longitudinal sectional view and a transverse sectional view of a capacitor showing a specific structure of the embodiment of the present invention. Reference numeral 1 denotes an element or an element assembly unit, which is housed in a case 2. Reference numeral 4 denotes a security device, which comprises a lead plate 47 constituting a main current path, a lead plate 48 constituting an auxiliary current path, and a mounting metal 41 on an insulating plate such as a resin plate, and a mounting metal fixed to the inner surface of the case 2. 3 attached. One end of the lead plate 47 constituting the main current path is connected to a lead wire from the lead terminal 21, and the other end is connected to a lead wire from the element or the element assembly 1. Lead plate constituting auxiliary current path
Both terminals 48 are connected to a lead wire from the auxiliary lead-out terminal 22.

FIGS. 4 and 5 are a longitudinal sectional view and a transverse sectional view showing a state in which the capacitor of the embodiment of the present invention is deformed by an internal failure or the like, and the security device is operated. Due to the deformation of the case 2, the main current path lead plate 47 and the auxiliary current path lead plate 48 attached to the security device 4 are all cut and opened. That is, the function of the capacitor is stopped by the operation of the security device.

FIG. 6 shows an example of the connection of the capacitor. The auxiliary current path 43 attached to the security device is connected to the operating current 30 in series with the auxiliary relay 35. Since the auxiliary current path 43 is opened by the operation of the security device, the auxiliary relay 35 is opened from the power supply, the contact 36 of this relay is turned on, the trip coil 25 of the power switch 20 of the capacitor 10 is excited,
The switch 20 opens. At the same time, the indicator light 40 is turned on to indicate that the security device has been operated. Although not shown, a bell or buzzer may be connected here to generate an alarm.

7 and 8 show the structure of a security device according to another embodiment. Reference numeral 47 denotes a lead plate constituting a main current path as in the above embodiment. Reference numerals 44 and 45 denote contacts forming an auxiliary current path, which are attached to the front and back of one of the insulating plates as shown in FIG. 7 (a). These contacts are made of a conductor such as a phosphor bronze plate having elasticity, and are each connected to the auxiliary lead-out terminal 22. FIG. 8 shows a state after the operation of the security device of this embodiment. The lead plate 47 constituting the main current path is cut off by the operation of the security device due to the deformation of the case, and the contact 44 of the auxiliary current path is connected to the lead plate 47. Since the insulating plate between 45 is pulled out, the contacts 44 and 45 come into contact with each other by the elastic force as shown in the sectional view of FIG. 8 (a). That is, the auxiliary current path is closed by the operation of the security device.

FIG. 9 shows an example of the connection of the capacitor of this embodiment. The auxiliary current path 44 attached to the security device is connected in series with a circuit in which the trip coil 25 of the power switch 20 of the capacitor 10 and the indicator light 40 are arranged in parallel. It is connected to the operation power supply 20. Since the auxiliary current path 44 is closed by the operation of the security device,
The trip coil 25 is excited, the switch 20 is opened, and the indicator light 40 lights to indicate that the security device has been operated. Although not shown, a bell or buzzer may be connected here to generate an alarm.

In the above embodiment, an example in which the auxiliary current path is opened or closed by the operation of the security device is shown. However, as shown in FIG. 10, the auxiliary current path is provided with both the path opened and closed by the operation of the security device. Is also possible. FIG. 11 and FIG. 12 show this embodiment. The embodiment shown in FIG. 6 is modified to attach a fixed connector 46 to the other insulating plate on which the contacts 44 and 45 are mounted. Things. Fig. 11 (a) when normal
As shown in the cross-sectional view, the contact 44 contacts the fixed contact 46 to form a current path at 44-46, but is separated from the contact 45 by an insulating plate, and the current path is opened at 44-45. ing. During operation of the security device, as shown in the sectional view of FIG. 12 (a), the path between the contacts 44 and 46 is opened and the path between the contacts 44 and 45 is closed.

As described above, it is often convenient in terms of circuit configuration to provide both a passage that opens and a passage that closes when the security device operates.

Effects of the Invention As described above, the capacitor provided with the security device of the present invention can easily and easily provide a signal for the operation of the security device by providing an auxiliary current path that is opened or closed by the operation of the security device integrally with the insulating plate. I can get it reliably,
As a result, the capacitor can be released from the power supply, a lamp can be displayed, and an alarm can be issued, so that it is possible to prevent a failure such as a decrease in the power factor without noticing the operation of the security device. It has great industrial and practical value.

[Brief description of the drawings]

FIG. 1 is an internal connection diagram of a capacitor according to an embodiment of the present invention, and FIGS. 2 and 3 are longitudinal and transverse sectional views of the capacitor showing the structure of a security device according to an embodiment of the present invention. FIG. 5 is a longitudinal sectional view and a transverse sectional view showing a state during operation of the security device in FIGS. 2 and 3, FIG. 6 is a connection diagram of a capacitor provided with the security device of the present invention, and FIG. The structure of the security device of another Example of this invention is shown, (a) is a front view, (b) is a top view, FIG. 8 is a state at the time of operation | movement of the security device shown in FIG. Is a front view, (b) is a plan view,
9 is a connection diagram of another embodiment of the capacitor provided with the security device of the present invention, FIG. 10 is an internal connection diagram of the capacitor of another embodiment of the present invention, and FIG. 11 is an embodiment of FIG. (A) is a front view, (b) is a plan view, and FIG.
11 (a) is a front view and FIG. 11 (b) is a plan view in a state where the security device shown in FIG. 11 is operating. 1: Capacitor unit, 2: Case 4: Security device, 42: Main current path 43: Auxiliary current path

────────────────────────────────────────────────── ─── Continuing from the front page Examiner Shinichi Yamazaki (56) References Jiyo Sho 62-87425 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) H01G 1/11

Claims (1)

(57) [Claims] 1. A capacitor element or an assembly thereof is housed in a case with one Y-connection, a △ connection or a single-phase connection, and a current path is cut off by utilizing a deformation of the case due to a rise in internal pressure of the case when an internal failure occurs. A capacitor provided with a security device, characterized in that a security device is provided with an auxiliary current path which is opened or closed by the operation of the security device in an insulating plate, in addition to the main current path.