JPH07320574A - Charged conductor supporting device - Google Patents

Abstract

PURPOSE:To improve reliability by providing a function, which detects heating of a charged conductor or charging voltage, in an insulator supporting the charged conductor, so that a number of part items is reduced to attain simplifying assembly and shortening an assembly manhour. CONSTITUTION:A detecting capacitor 11 of large electrostatic capacity by a temperature change is arranged to be extension connected to an upper cover 3 in a hollow part 2 of an insulator 1. In series to this capacitor 11, a divider capacitor 12 of small change of electrostatic capacity by a temperature change is connected. Both ends of this series circuit are connected to the upper cover 3 and a lower cover 5, and a connection point of the capacitors 11, 12 is connected to a signal output terminal 10. Accordingly, by a temperature rise of a charged conductor 4, a temperature of the capacitor 11 rises through the upper cover 3, to largely change the electrostatic capacity, and voltage in proportion to divided ratio to the capacitor 12 is detected from the signal output terminal 10, to detect overheating of the charged conductor 4 and charging voltage.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a charging conductor supporting device having an insulator supporting a charging conductor and having a function of detecting heating of the charging conductor or charging voltage.

[0002]

2. Description of the Related Art Usually, a charging conductor used in a high-voltage, large-current circuit is made of strip-shaped copper or aluminum, and a plurality of conductors are arranged in parallel and insulated from the ground at a predetermined distance. ing. In order to secure the insulation, an inexpensive and easy-to-use supporting insulator is used.

The support device for the charging conductor is as shown in FIG. In the figure, A is a schematic configuration diagram,
B is a circuit diagram, 1 is a support insulator in which a hollow portion 2 is formed, 3 is a metal heat-conductive upper lid that closes an upper opening of the hollow portion 2 and is in contact with a charging conductor 4 fixed by a bolt body,
Reference numeral 5 is a lower lid body that closes the lower opening of the hollow portion 2 and is grounded.

Reference numerals 6, 7, and 8 denote first, second, and third capacitors 9 connected in series between the upper lid 3 and the lower lid 5.
Is close to the upper lid 3 and is connected to both ends of the first capacitor 6 and is closed at a predetermined temperature. 10 is connected to a connection point between the second capacitor 7 and the third capacitor 8,
This is a signal output terminal derived from the insulator 1.

In a normal state where the charging conductor 4 is not heated, the temperature of the upper lid 3 does not rise, the heat sensitive switch 9 is open, and the charging voltage of the charging conductor 4 is the first and second.
The divided voltage divided by the capacitors 6 and 7 and the third capacitor 8 is output from the signal output terminal 10.

Next, when the temperature of the conductor 4 rises due to a contact failure at the connection portion of the charging conductor 4 or the like, the upper lid 3 becomes hot and the heat sensitive switch 9 operates and closes, and the first capacitor 6 becomes The charging voltage is short-circuited and divided by the second capacitor 7 and the third capacitor 8, the divided voltage is output from the terminal 10, and overheating of the conductor 4 is detected.

[0007]

In the case of the conventional supporting device, a large number of parts such as the three capacitors 6, 7, 8 and the heat sensitive switch 9 are assembled in the relatively small hollow portion of the supporting insulator 1. Since the assembly is complicated, it takes a long time, and the number of parts is large, there is a problem that the failure rate of the finished product is high, the reliability is lowered, and the cost is high.

In consideration of the above points, the present invention provides a charge conductor supporting device which is reduced in the number of parts to simplify the assembling, shorten the assembling man-hour, and improve the reliability. With the goal.

[0009]

In order to solve the above-mentioned problems, a charging conductor supporting device of the present invention is an insulator supporting a charging conductor, and an electrostatic capacity of the conductor incorporated in the insulator due to a temperature change of the conductor. A detection capacitor having a large change, and a signal output terminal connected to the capacitor and led to the insulator,
A voltage dividing capacitor provided between the capacitor and the ground and having a small change in capacitance due to temperature change is provided.

[0010]

The charging conductor supporting device of the present invention configured as described above includes a detecting capacitor having a large change in electrostatic capacitance due to temperature change of the charging conductor and a voltage dividing capacitor having a small change in electrostatic capacitance due to temperature change. Since the signal output terminal is provided at the connection point with, the capacitance of the detection capacitor changes significantly due to the temperature rise of the charging conductor, and the divided voltage with the voltage dividing capacitor changes, and the voltage division ratio A proportional voltage is detected from the signal output terminal and overheating or charging voltage of the charging conductor, or overheating and charging voltage are detected simultaneously.

[0011]

EXAMPLES Examples will be described with reference to FIGS. 1 and 2. In these drawings, the same reference numerals as those in FIG. 3 denote the same or corresponding parts, and first, FIG. 1 of one embodiment will be described. Reference numeral 11 denotes a detection capacitor, which is arranged close to the upper lid 3 of the hollow portion 2 of the insulator 1, and has a large change in capacitance due to temperature change. Reference numeral 12 denotes a voltage dividing capacitor, which has a small change in capacitance due to temperature change, is connected in series with the detecting capacitor 11, and both ends of the series circuit are connected to the upper lid body 3 and the lower lid body 5,
The connection point of both capacitors 11 and 12 is connected to the signal output terminal 10 of the insulator 1.

Therefore, the temperature of the charging conductor 4 rises, the temperature of the detection capacitor 11 rises via the upper conductor 3, the capacitance of the detection capacitor 11 changes greatly, and a voltage proportional to the voltage dividing ratio with the voltage dividing capacitor 12 becomes Detected from the signal output terminal 10, overheat of the charging conductor 4 and charging voltage are detected.

Next, FIG. 2 showing another embodiment is one in which the voltage dividing capacitor 12 is not provided in the hollow portion 2 of the insulator 1 but is provided outside the insulator 1 on the side of the detecting device 13. In the detection device 13, the voltage dividing capacitor 12 is provided between the signal output terminal 10 and the ground.

[0014]

Since the present invention is constructed as described above, it has the following effects. The charging conductor supporting device of the present invention has a connection point between a detection capacitor having a large change in capacitance due to temperature change of the charging conductor and a voltage dividing capacitor having a small change in capacitance due to temperature change.
Since the signal output terminal is provided, the capacitance of the detection capacitor changes significantly due to the temperature rise of the charging conductor,
The divided voltage with the voltage dividing capacitor changes, and a voltage proportional to the voltage dividing ratio is detected from the signal output terminal, and overheating or charging voltage of the charging conductor, or overheating and charging voltage are simultaneously detected. In addition, the parts to be assembled in the insulator 1 are only the detecting capacitor 11 or the voltage dividing capacitor 12, the number of parts is small, the assembly is easy and the assembly man-hour can be shortened, and the number of parts is reduced. The probability of failure occurrence is low, the reliability is improved, and the cost can be reduced.

[Brief description of drawings]

1A and 1B are a schematic configuration diagram and a circuit diagram of one embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of another embodiment of the present invention.

3A and 3B are a schematic configuration diagram and a circuit diagram of a conventional example.

[Explanation of symbols]

 1 Insulator 4 Charging Conductor 10 Signal Output Terminal 11 Detection Capacitor 12 Voltage Dividing Capacitor

Claims (1)

[Claims] 1. An insulator supporting a charging conductor, a detecting capacitor incorporated in the insulator and having a large change in electrostatic capacitance due to a temperature change of the conductor, and a signal output connected to the capacitor and led to the insulator. A charging conductor supporting device comprising a terminal and a voltage dividing capacitor provided between the capacitor and the ground and having a small change in electrostatic capacitance due to temperature changes.