JPS612082A - Display device of deterioration of insulator insulation - Google Patents

Abstract

PURPOSE:To appreciate the deterioration of an insulator before the generation of a ground-fault accident by inserting a display part body obtained by connecting a resistor and a liquid crystal display element in parallel between an insulator fitting crossarm and the earth. CONSTITUTION:The display part body 4 is obtained by connecting the liquid crystal display element (a) and the resistor (b) in parallel. The change of resistance between the cross arm 2 and the earth 5 which may be generated due to the change of the state of a pole is reduced by the resistor (b) connected between the crossarm 2 and the earth 5 so that a voltage proportional to a leaked current of the insulator is generated between both the ends of the resistor (b) independently of the state of the pole. Since the display voltage of the element (a) has a threshold, a voltage generated on both the ends of the resistor (b) when a leaked current decided as the cause of the deterioration of the insulation of the insulator flows is set up so as to exceed slightly the threshold value. When the deterioration exceeds a prescribed level, the display of the element (a) suddenly appears, so that the state of the insulator can be easily decided only by observing the existence of the display.

Description

[Detailed Description of the Invention] The present invention detects the voltage between the insulator mounting arm and the ground, which is generated by leakage current due to insulation deterioration of the insulator, and utilizes the characteristic that the display voltage of the liquid crystal has a threshold value. This invention relates to a device that displays the state of insulation deterioration of an insulator.

Current methods for detecting insulators with poor insulation include visually detecting the insulators in the section where the ground fault has occurred when micro-ground faults occur frequently, and the other method is to cut off the power in the section where the ground fault has occurred and then apply high-voltage pulses to the wire. There is a method of detecting by measuring the pulsed current applied to each utility pole that flows from the insulator to the utility pole. All of these require a great deal of manpower, time, and equipment, and furthermore, these detection methods are useless in terms of accident prevention because they are carried out only when the insulation of the insulator has deteriorated and a ground fault has occurred. Therefore, there has been a need for a device that can easily evaluate the insulation deterioration of an insulator before a ground fault occurs.

In order to meet this demand, the present invention first focuses on the display voltage threshold of the liquid crystal and uses this to indicate the insulation deterioration of the insulator, and also eliminates the uncertainty of the display depending on the weather etc. Therefore, resistors are connected in parallel with the liquid crystal and these are inserted between the insulator mounting arm and the ground.

To explain one embodiment of the present invention with reference to the drawings, in FIG. 1, pure gold 2 with two insulators 1 attached is fixed to the upper end of a utility pole 3, and a utility pole ground 5 is exposed on the lower surface of the utility pole 3. It will be established. The inner end of the earth 5 is grounded through the inside of the utility pole. The display body 4 is inserted between the pure gold 2 and the telephone pole ground 5 with multiple connections to the electric wires 6°6I.

Details of the display main body 4 are shown in FIG. That is, the liquid crystal display element a and the resistor are connected in parallel, and both ends thereof are terminals c,
c' and these are all fixed at pace d. Electric wires 6 and 6/ are connected to terminals e and e', respectively.

The base d+-t is fixed to the surface of the telephone pole 3 in FIG. 1 using a jig.

There is a resistance component of the utility pole between the insulator mounting arm 2 of the utility pole and the utility pole ground 5, that is, the earth, and a contact resistance component between the pure gold 2 and the electric wire 6. When a leakage current generated due to insulation deterioration of the insulator 1 flows from the pure gold 2 to the earth 5 through the utility pole 3, a voltage is generated between the pure gold 2 and the earth 5 due to this current. By measuring this voltage, it is possible to detect the degree of insulation deterioration of insulator 1, but according to the results of experiments, the resistance between pure gold and the earth is several hundred ohms when dry, and several ohms when wet. Since the voltage varies greatly depending on the state of the insulator, it is not possible to accurately evaluate the degree of insulation deterioration of the insulator simply by measuring the voltage between the pure gold 2 and the ground 5. Therefore, according to the present invention, arm 2 and earth 5
Since a resistor is installed between the poles, the change in resistance between the pure gold 2 and the ground 5 due to changes in the state of the utility pole is reduced, and a voltage proportional to the leakage current of the insulator is applied between both ends of the resistor regardless of the state of the pole. can be made to occur.

Next, the display voltage of the liquid crystal display element a has a threshold value. The present invention takes advantage of this fact to ensure that the voltage generated across the resistor slightly exceeds the display voltage 1-threshold of the liquid crystal display element a when a leakage current flows, which is considered to be due to insulation deterioration of the insulator. Set it like this.

Then, when the insulation deterioration of the insulator exceeds a predetermined level, the display on the liquid crystal display element a suddenly appears, and the insulator inspector can very easily judge whether the insulator is good or bad just by looking at the presence or absence of this display. .

According to the present invention, various effects as described below can be obtained. (υ It is possible to evaluate insulator deterioration before a ground fault occurs. (2) It is possible to inspect the insulator while it is charged without a power outage. (3) Insulator deterioration can be determined by the presence or absence of the liquid crystal display. There are no individual differences in evaluation. (4) By attaching the display unit to the utility pole, there is no need to carry any equipment such as measuring instruments. (5) There are no moving parts, the structure is simple, and mass production is possible. Moreover, maintenance is easy.

[Brief explanation of the drawing]

FIG. 1 is a schematic elevational view of an apparatus according to the present invention, and FIG. 2 is a schematic configuration diagram of the main parts. 1: Insulator 2: Insulator mounting arm 3: Telephone pole 4: Display body a: Liquid crystal display element b: Resistor c, c': Terminal d: Case 5: Telephone pole ground 6, 6': Electric wire agent patent attorney Kamiyama
Manipulate 1 Figure + 2 Figures

Claims (1)

[Claims] A display main body, in which a resistor and a liquid crystal display element are connected in parallel, is inserted between the insulator mounting arm and the ground, and the voltage generated across the resistor due to leakage current during charging due to insulation deterioration of the insulator. An insulator insulation deterioration indicator set so that the voltage slightly exceeds the display voltage threshold of the liquid crystal display element.