JPS63140514A - Capacitor device - 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) The present invention relates to a capacitor device, and more particularly to a capacitor device that improves discharge performance when energization is stopped and reduces power loss when energizes.

(Prior art) Phase advance capacitor devices are installed in AC power transmission and distribution lines, etc. to improve the power factor, but one of the performances required of such capacitor devices is There is a discharge performance when the residual charge is discharged after stopping. In order to cause this discharge to occur quickly, in conventional capacitor devices,
As shown in FIG. 4, a resistor element 6 is connected to a capacitor element 61.
2 are connected in parallel, and the residual charge accumulated in the capacitor element 61 is discharged through the resistor element 62.

(Problem to be solved by the invention) By the way, when energizing the capacitor device as described above,
Naturally, a current also flows through the discharging resistive element 62, and the power consumed by this current becomes power transmission/distribution loss. Therefore, if an attempt is made to improve the above-mentioned discharge performance by interposing a resistive element with a small resistance value, the current flowing through this resistive element during energization will increase,
Therefore, when electricity is applied, a large power loss occurs. As described above, in the past, it has not been possible to improve discharge performance and reduce power loss at the same time.

This invention has been made to solve the above conventional problems, and its purpose is to provide a capacitor device that has low power loss when energized and has excellent discharge performance when energized. .

(Means for Solving the Problems) Therefore, in the capacitor device of the present invention, a heat-sensitive resistance element with a positive characteristic is connected in parallel to a capacitor element connected to an external terminal.

(Function) The capacitor device having the above structure has the following function. That is, when this capacitor device is energized, the resistance value of the heat-sensitive resistance element increases due to self-heating, and the current flowing through it decreases, thereby reducing power loss in the heat-sensitive resistance element.

On the other hand, after the current supply is stopped, the current supply to the heat-sensitive resistance element is stopped and the resistance value immediately becomes small, and the residual charge of the capacitor element is effectively discharged by the heat-sensitive resistance element.

(Effects of the Invention) As described above, when electricity is applied, the power loss is reduced by increasing the resistance value of the heat-sensitive resistance element, and when electricity is stopped, the residual charge in the capacitor element is discharged by the heat-sensitive resistance element with a low resistance value. Power loss in the capacitor device can be reduced compared to the conventional art. Therefore, it is possible to select a heat-sensitive resistance element with positive characteristics that has an optimal resistance value for speeding up discharge when the current supply is stopped, and discharge performance can be improved.

(Embodiments) Next, specific embodiments of the capacitor device of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a schematic circuit diagram showing a first embodiment of the capacitor device of the present invention, and in the figure, 1 is a case;
External terminals U and V are attached to the end face of this case 1. A capacitor element 2 connected to these external terminals U and ■ is arranged inside the case 1.
A heat-sensitive resistance element 3 having a positive characteristic is connected in parallel to the .

In the capacitor device having the above configuration, when an alternating current voltage is applied to the external terminals U and V, the heat-sensitive resistance element 3 is energized, heat is immediately generated due to ohmic loss, and the temperature of the heat-sensitive resistance element 3 rises rapidly. As a result, the resistance value of the heat-sensitive resistance element 3 having positive characteristics immediately increases, the value of current applied to the heat-sensitive resistance element 3 decreases, and power loss is reduced. On the other hand, when energization is stopped, the temperature of the heat-sensitive resistance element 3 rapidly decreases due to the stoppage of heat generation due to the energization stop, and the electrical resistance value of the heat-sensitive resistance element 3 decreases accordingly, and the residual charge in the capacitor device 2 is discharged. This is effectively done through the heat sensitive resistive element 3. The discharge time of capacitor element 2
Since it corresponds to the time constant determined from the capacitance of and the resistance value of the heat-sensitive resistor element 3 when the current supply is stopped, it is possible to select a heat-sensitive resistor element 3 with positive characteristics that exhibits a resistance value that can provide optimal discharge performance when the current supply is stopped. . Therefore, in this capacitor device, it is possible to reduce power loss during energization and improve discharge performance when energization is stopped.

FIG. 2 is a schematic circuit diagram showing a second embodiment of the capacitor device of the present invention. In the second embodiment, a heating resistance element 4 is connected in parallel with the heat-sensitive resistance element 3 in the first embodiment, and this heating resistance element 4 is connected to F:F! , is arranged in a position close to the thermal resistance element 3. As this heating resistance element 4, a resistor having a fixed resistance value is used. The resistance value of this heating resistance element 4 is selected to be sufficiently larger than the resistance value of the heat-sensitive resistance element 3.

When the capacitor device having the above configuration starts to be energized, current flows through the heat-sensitive resistance element 3 as well as the main current flowing through the capacitor element 2. At this time, current also flows through the heating resistance element 4, and this heating resistance element 4 I get a fever. As the temperature of the heat-sensitive resistance element 3 rises due to the heat generation, its resistance increases rapidly, the flowing current decreases, and the power loss in the heat-sensitive resistance element 3 decreases. In the first embodiment above,
The structure was such that the heat generated by the heat-sensitive resistance element 3 increases its resistance value (and reduces the flowing current), but in the above device, a heating resistance element 4 for heating the heat-sensitive resistance element 3 is specifically provided. Therefore, after electricity starts flowing, the resistance value of the heat-sensitive resistance element 3 increases in a short period of time, and the flowing current decreases rapidly, so that the power of the capacitor device decreases. Loss can be further reduced.

FIG. 3 is a schematic circuit diagram showing a third embodiment of the capacitor device of the present invention. The third embodiment has a configuration in which a heating resistance element 4a is connected in series with the heat-sensitive resistance element 3 in the first embodiment, and this heating resistance element 4a is disposed at a position close to the heat-sensitive resistance element 3. . This heating resistance element 4a
As the resistor, a resistor having a specific resistance value is used. Its resistance value is selected to be sufficiently smaller than that of the heat-sensitive resistance element 3.

When the capacitor device configured as described above starts to be energized, the current flowing through the heat-sensitive resistance element 3 decreases in a short time, substantially similar to the second embodiment, and the power loss of the capacitor device can be reduced. Furthermore, after the resistance value of the heat-sensitive resistance element 3 increases, the current flowing through the heating resistance element 4a decreases, so that the power loss in the heating resistance element 4a can be reduced.

Regarding the second embodiment and the third embodiment, the same parts as in the first embodiment are indicated by the same reference numerals, and the explanation thereof will be omitted.

As explained above, in the capacitor device of the present invention, the heat-sensitive resistance element 3 with positive characteristics is connected in parallel to the capacitor element 2, which reduces power loss during energization and improves discharge performance when energization is stopped. It is possible to aim for Note that the capacitor device of the present invention is not limited to the above-mentioned embodiments, and can be modified in various ways within the scope of the present invention. Although the present invention has been described for use with other grounding capacitor devices and surge absorbing capacitor devices.

[Brief explanation of the drawing]

1 to 3 are schematic diagrams of the internal circuitry of the capacitor device of the present invention, respectively, showing first to third embodiments, and FIG. 4 is a schematic diagram of the internal circuitry of the conventional device. 2... Capacitor element, 3... Heat sensitive resistance element, U,
V...External terminal. Patent applicant Masahiro Nishimori, representative of Shizuki Electric Manufacturing Co., Ltd. Figure 1 Figure 2 Figure 3 @ Figure 4

Claims (1)

[Claims] 1. A capacitor device characterized in that a heat-sensitive resistance element with a positive characteristic is connected in parallel to a capacitor element connected to an external terminal.