JPH02159576A - Measuring apparatus of insulator shared voltage - Google Patents

Abstract

PURPOSE:To enable execution of accurate measurement by a method wherein a discharge started between opposite discharge terminals spaced oppositely by an appropriate gap is detected by a discharge detector. CONSTITUTION:When a discharge is started between discharge terminals 2 and 3 spaced oppositely by an appropriate gap, it is detected 4 and a gap adjuster 5 such as a motor is driven by a control element 6 on the basis of the presence of the detection. Thereby a rotary shaft 7 is moved back in the direction of an arrow (a), a gap length between the terminals 2 and 3 is extended and the discharge between the terminals 2 and 3 stops. Since no discharge turns to be detected by the detector 4 when the discharge stops, the control of the adjuster 5 by the control element 6 is discontinued and also the adjuster 5 stops. The number of rotations of the adjuster 5 until it stops is measured by a measuring device, the gap length is detected from a measured value, and further a shared voltage at that time is detected.

Description

[Detailed Description of the Invention] (Industrial Application Field) The insulator sharing voltage measuring device of the present invention is used for maintenance of overhead power transmission lines.
During inspections, defective insulators are detected by measuring the shared voltage applied to both ends of each insulator that makes up the insulator chain.

(Prior art) Conventionally, as a defective insulator detector (insulator share voltage measuring device) that detects a defective insulator by measuring the shared voltage of the insulator, there has been a fixed gap acoustic type as shown in Fig. There were acoustic pulse types as shown in Figures 4 and 5. These insulator sharing voltage measuring instruments are used by applying the horn D of the insulator sharing voltage measuring instrument to each insulator B of the insulator chain A as shown in Fig. 6a, as shown in Figs. This is to measure the insulator shared voltages V, , V, . . . vo applied to both ends of B.

(Problems with conventional technology) Conventional insulator voltage measuring instruments have the following problems.

■The above-mentioned fixed gap type insulator shared voltage measuring device is designed to cause a discharge between discharge terminals E and F, which are facing each other through a discharge gap, when the single division voltage exceeds a preset voltage. Therefore, although it is possible to detect that the shared voltage has exceeded the set voltage due to the start of discharge, it has not been possible to specifically determine how much the shared voltage is.

■The equivalent circuit of insulator B is shown in Figure 6.1
The shared voltage V,,V,...Vl is the capacitive coupling C,,C,...
...Since it is determined by C1, in an acoustic pulse type defective insulator detector with a built-in coupling capacitor C as shown in Figure 5, the capacitance of the capacitor C cannot be ignored during measurement, and the same capacitance is a cause of measurement error. It becomes.

(Object of the Invention) An object of the present invention is to provide an insulator shared voltage measuring device that can concretely measure how much the shared voltage is and has a small measurement error.

(Means for Solving the Problems) The insulator shared voltage measuring device of the present invention has two discharge terminals 2.3 facing each other across a discharge gap l and a discharge between the discharge terminals 2.3 as shown in FIG. a discharge detector 4 that detects the presence or absence of the
This device is characterized by comprising a gap adjustment machine 5 that adjusts the length of the discharge gap l (gap length) and a control section 6 that controls the gap adjustment machine 5.

(Function) In the insulator voltage measuring device of the present invention, when a discharge is started between the discharge terminals 2 and 3 facing each other at an appropriate distance, it is detected by the discharge detector 4, and based on the presence or absence of the detection, A gap adjustment device 5 such as a motor is driven by the control unit 6, and the rotating shaft 7 rotated thereby retreats in the direction of the arrow a, increasing the gap length between the discharge terminals 2.3. The discharge at stops. When the discharge stops, the discharge detector 4 no longer detects the discharge, so the gap adjustment by the control section 6 I! 5 is stopped, and the gap adjustment machine 5 is also stopped. The rotational speed of the gap adjustment 11 (motor) 5 until this stop is measured by the meter Wg device 8 shown in FIG. . Also, contrary to the above, the discharge gap l is widened first, and the discharge terminal 2.
The control unit 6 adjusts the gears until discharge starts between 3 and 3! In! 5 can be driven to narrow the discharge gap l, and the gap length at the start of discharge can also be detected.

In addition to the method described above, the gap length can be measured by attaching a measuring device such as a caliper to the movable discharge terminal 3 side.

This may be done by measuring the amount of movement of the discharge terminal 3 using the measuring device, or by directly visual inspection by an operator.

(Example) FIG. 1 shows an example of the insulator division voltage measuring device of the present invention.

In the same figure, 2 and 3 are spherical structures facing each other across the discharge gap l! One of the discharge terminals 1 is fixed, and the other discharge terminal 2 is movable back and forth in the directions of arrows a and b. The discharge terminals 2 and 3 may be movable together.

Reference numeral 12 in FIG. 1 is a horn that is brought into contact with the metal part of the insulator B when measuring the divided voltage, and is provided protruding from the discharge terminals 2 and 3.

4 is a discharge detector, which uses a UV detection tube or the like for detecting ultraviolet rays generated during discharge between the discharge terminals 2 and 3.

Is 5 free? This is a gap adjustment machine that adjusts the gap length between the li terminals 2 and 3, and a motor is used for this, for example.

Reference numeral 6 denotes a control unit for controlling the gap adjustment 1115, which rotates the gap adjustment device 5 such as a motor when the discharge detector 4 detects a discharge between the discharge terminals 2 and 3.

Reference numeral 7 denotes a rotating shaft, which rotates in the same direction as the gap adjuster 5 rotates and moves the discharge terminal 3 in the direction of arrow a. For this reason, the rotary shaft 7 is threaded so that, for example, when it is rotated forward by the gap adjuster 5, it moves backward in the direction of the arrow a, and when it is rotated reversely by the adjuster 5, it moves forward in the direction indicated by the arrow. A threaded shaft is used.

8 in Fig. 2 is a measuring instrument, which is used for gap adjustment l1l.
(motor) 5, calculates the moving distance of the discharge terminal 3, and measures the gap length.
The 111 device 8 is attached to an insulating rod 9, and the contactor 11 comes into contact with a rotating part such as the rotating shaft of the gear knob adjustment l1St (motor) 5, so that the rotation speed of the gap adjustment rock 5 can be detected. be.

In the measurement shared voltage measuring device in the above embodiment, when the measurement of the shared voltage of the previous insulator B is completed and the shared voltage of the next insulator B is to be measured, the voltage is expanded when measuring the shared voltage of the previous insulator B. It is necessary to return the gap 1 between the discharge terminals 2 and 3 to the original gap length before widening. For this purpose, for example, a receiving mechanism that operates by optical pulses, sound waves, radio waves, etc., is provided in the ear part 6, and the receiving mechanism receives the optical pulses, sound waves, radio waves, etc. emitted from the ground-F. When received and remotely controlled, the control unit 6 drives the gap adjuster 5 to rotate the rotating shaft 7 in the opposite direction (direction indicated by the arrow) from the previous time, thereby reducing the gap between the discharge terminals 2 and 3. Try to narrow the length.

In the above embodiment, both or one of the discharge terminals 2.3 are moved to increase the length of the discharge gap l, but on the contrary, the length of the discharge gear l? Both or one of the discharge terminals 2.3 may be moved to shorten them.

(Effects of the Invention) The insulator shared voltage measuring device of the present invention has the following effects.

■When the discharge between the discharge terminals 2 and 3 starts, either move the discharge terminals 2 and 3 relatively to the position where the discharge stops to widen the discharge gap l, or discharge the discharge between the discharge terminals 2 and 3. The purpose is to narrow the discharge gap l by moving the discharge terminals 2.3 relatively until the
There is almost no leakage, and there is no possibility of malfunction due to the same capacity.
Accurate measurement becomes possible.

■ In the second aspect of the invention, the gap length between the discharge terminals 2 and 3 is automatically measured from the movement of the discharge terminals 3.
The measurement of the shared voltage can be automated and can be performed easily and quickly.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing an example of the insulator division voltage measuring device of the present invention, Fig. 2 is an explanatory diagram of the measuring section in the same device, and Figs. 3 to 5 are explanatory diagrams of a conventional insulator division voltage measurement device. , 6th
Figure a is an explanatory diagram of the shared voltage of the insulator chain, and it is an explanatory diagram of the equivalent circuit of Figure a. 1 is the discharge gap 2. 3 is the discharge terminal 4 is the discharge detector 5 is the gap adjuster 6 is the control unit 8 is the measuring device (Figure 5, Figure 6, C) (b)

Claims (2)

[Claims] (1) Discharge terminals 2 and 3 facing each other across discharge gap 1
, a discharge detector 4 that detects the presence or absence of discharge between the discharge terminals 2 and 3, and a gap adjustment machine 5 that adjusts the length of the discharge gap 1 by moving both or one of the discharge terminals 2 and 3. , and a control section 6 that controls a gap adjuster 5. (2) The insulator division voltage measuring device according to claim 1, further comprising a measuring device 8 for measuring the interval of the discharge gap 1 from the amount of movement of the gap adjuster 5.