JPS599569A - Method and apparatus for detecting bad insulator - Google Patents

Abstract

PURPOSE:To perform safety measurement of a bad insulator, by successively moving a measuring instrument between strain insulators by manipulating an expansible type insulated manipulating rod attached to the main body of the measuring instrument to measure the strength of the electric field of the insulator. CONSTITUTION:The main body B of a measuring instrument having an expansible type insulated manipulating rod C is placed on a strain insulator A and the rotary parallel drum 8 of the main body B is rotated by manipulating the manipulating rod C to rotate the main body B on the insulator A while a slip-off wheel 9 is slipped off between the insulators at the insulator interval and a contact electrode 10 is contacted with the metal fittings of the insulator A to keep the measuring position thereof. The voltage dividing device 30 of the main body B is rotated left and right by rotating the manipulating rod C left and right in this state and measuring electrodes 34, 35 provided thereto are contacted with the metal flat plate 10a of the electrode 10 to enable measurement while voltage is displayed by an electricity/light converting measuring instrument 60 through an optical fiber 50 to carry out measurement. By this constitution, the measuring instrument can be easily moved on the strain insulator at the high place of a pylon and safe measurement is enabled.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for detecting defective tension insulators due to deterioration of tension insulators used in overhead power transmission lines, for example, 500W class overhead power transmission lines.

For example, in order to connect a 500-class overhead power transmission line between steel towers and support the transmission line on the tower, multiple tensile insulators (approximately 8m distance)
2-unit device 2 (see Figure 1) or 3-unit device 3 (second
(see figure) is used to hold the tension of the power transmission line 4.

Recently, electric power companies have been studying methods for detecting defective insulators in order to prevent accidents caused by the deterioration of the insulators. One method proposed is to detect defective insulators by measuring the electric field strength or potential difference of the insulator using a combination of a BSO sensor and an optical fiber cable.

The B50-t=sensor is a passive device that combines small optical elements, and has the advantage of being able to accurately measure spatial electric field distribution and potential difference without causing large disturbances to the electric field being measured, and can be used without a power source. operational and high input impedance.

In addition, fiber optic cables are used as transmission lines, and have the advantage of being able to electrically isolate the BSO sensor and fiber optic voltmeter, making it possible to safely measure electric field strength and potential differences, and to achieve highly accurate measurements without induction. are doing.

As mentioned above, it has become possible to measure the electric field strength and potential difference of an insulator by using a combination of an SO 7 sensor and an optical fiber. 1-, there is no suitable means for freely driving it forward and backward, and it has not yet been put to practical use.

The purpose of the present invention is to solve the above-mentioned problems and provide a method and device for detecting defective insulators that can be put to practical use. , the parallel drum is equipped with a plurality of sliding rings on its outer surface and a contact electrode passing through the sliding rings, and a measuring device body is attached to the measuring device body, and a measuring voltage divider is provided between the parallel drums. This is a method for detecting defective insulators, and a device used therein, in which defective insulators are determined by sequentially moving between tension-resistant insulators and measuring the electric field strength or potential difference of the insulators by operating a telescopic insulating operation rod.

Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings (FIGS. 3 to 8).

Figure 3 is a side view showing the connected state of the tension insulator (N).
) is an insulator, (6) is an insulator mounting metal fitting, (, zl), (
i2) indicates the interval at which measurements are taken. 4th. The figure is an explanatory diagram showing the measurement state in which the measuring instrument body (B) with the expandable insulating operating support (C) is mounted on the tension-resistant insulator body (Tension-resistant insulator). ) to (c), Fig. 6 is a detailed view of the telescopic insulated operating valve, and Fig. 7 is a detailed view of the measurement voltage divider (30) and the voltage divider (30) and the BSO sensor ( 40), connection diagram with optical fiber cable (50) and electrical/optical conversion measuring device (60), Figure 8 is BS
A wiring diagram of an equivalent circuit of the voltage applied to one end of the O-sensor is shown.

As the details of the measuring instrument body (B) are shown in Fig. 5, a rotating parallel drum (8) is attached to the sled body (7) and is rotated by the operation of the telescoping insulating operating rod (C). It is installed so that it can be moved on top. The rotary parallel drum (8) has a plurality (3 to 5) of sliding wheels (9) on its outer surface, and a metal flat plate (10a) on its inner surface. 10a), a contact electrode 00 is provided which penetrates the sliding ring (9) and projects to the outside. Figure 5 (
In a), the contact electrode 00 is attached to the tension insulator (A) and is in a state where it is in contact with the metal fitting (6) and can be measured. In addition, 0υ is the installation part of the telescoping type insulation operating shaft (C), and (a) is the measurement voltage divider (see Figure 7). The perspective view, FIG. 5(C), shows a perspective view from the side.

Figure 6 shows an example of a telescopic insulated operating rod (C),
FIG. 6(a) is a front view, and FIG. 6(Φ) is a side view. In the drawing, (2) is a rod with an expandable scale, (22) is a rubber cover, (23) is an insulated operating rod, and (2z) is a reduced rope attached to the insulated operating rod, and is a pulley that guides the rope (2z). be. The insulated operating rod can be extended or contracted by filling air or N2 gas inside the operating rod by operating a pump and stretching it under pressure, or by manually stretching it. Also dedicated to operation (
When reducing the size of C), the air or N2 gas sealed inside the operating rod (C) is removed from the gas vent C9 to reduce the size.

Alternatively, use a vacuum pump to evacuate, or use a rope (
24) is used.

Figure 7 shows the voltage divider side for measurement.
It has a secondary electrode (support), a tertiary electrode, and a BSO sensor (40
), and the sensor (411 is connected to the voltage display screen of the optical/electrical conversion measuring device via an optical fiber cable (to). (34)', (351 are measurement electrodes) −〇− is shown.

The voltage v28 applied across the BSO seven sensors (40) is:
As shown in the equivalent circuit diagram 8, C+a/C+a-1-Czs-1-CB is appropriately selected and V
By bringing 28 within the measurement range of the BSO, the voltage of V12 can be measured.

However, CI2 is the capacitance C]3 between the primary electrode and the secondary electrode.
is the capacitance C2s between the primary electrode and the tertiary electrode is the secondary electrode ~
The capacitance CB between the tertiary electrodes is on the low voltage side of BSO, and the capacitance IN is on the high voltage side.In actual measurement, as shown in Figure 41, a telescopic insulated operating rod (C) is placed on a tension insulator (A). ) of the measuring instrument body attached with ) is placed, and the rotating parallel drum (8) of the measuring instrument body (B) rotates by operating the insulating operation rod (C), which rotates the tension insulator (A) l. However, the sliding ring (9) slides down between the insulators at the insulator interval (i,)()2), and as shown in FIG. ) to secure the measurement position. Under such conditions, by rotating the insulated operating rod (C) left and right, the voltage divider (?A) of the measuring instrument body (B) rotates left and right, and the measurement Electrode +34) (35
1 comes into contact with the flat metal plate (1Oa) of the contact electrode 00 to enable measurement, and then via the optical fiber cable 60),
An electrical/optical conversion measuring device (to) that displays the voltage and performs measurements.

The detection device of the present invention is portable and easy to move, and when combined with the operation of a telescoping insulated operating rod, it can be mounted high on a steel tower and easily moved over the tensile insulator, making safe measurements possible. That is.

[Brief explanation of drawings]

Figures 1 and 2 are diagrams of the overhead power transmission line and the installation status of double and triple tension insulators, Figure 8 is a side view showing the connected state of the tension insulators, and Figure 4 is An explanatory diagram showing the measurement state, Fig. 5 is a detailed view of the measuring instrument body, Fig. 6 is a front view (a) and side view (b) of the telescoping insulated operating rod, and Fig. 7 is details of the measuring voltage divider. FIG. 8 is an equivalent circuit diagram of the voltage applied across the BSO sensor. In the drawings, (A) is a tension insulator, (B) is the main body of the measuring device, (C) is a telescopic insulated operating rod, (30) is a voltage divider for measurement, (40) is a BSO 7-cer, and Sake is an optical fiber. Cables and +60+ indicate optical/electrical conversion measuring instruments, respectively. 9- (b) JP-A-59-9569 (5)

Claims (4)

[Claims] (1) A rotating parallel drum is installed on the sled body,
The parallel drum was equipped with a plurality of sliding rings on its outer surface and a contact electrode passing through the sliding rings, and a measuring device body was attached to the measuring device body, and a measuring voltage divider was provided between the parallel drums. 1. A method for detecting defective insulators, which comprises discriminating defective insulators by sequentially moving between tension-resistant insulators by operating an expandable insulator and measuring the electric field strength or potential difference of the insulators. (2) A method for detecting a defective insulator according to claim 1, characterized in that the contact electrode contacts the insulator metal fitting as a result of the sliding ring sliding down between the tension insulators, and the measurement position is automatically determined. . (3) A parallel drum rotatably installed on the sled body. A plurality of sliding rings are provided on the outer surface of the parallel drum, and a metal flat plate is provided on the inner surface of the parallel drum. The measuring instrument body is equipped with a contact electrode protruding from the outside and a measuring voltage divider provided between the parallel drums, and a telescopic insulated operating rod detachably attached to the measuring instrument body. Features: A defective insulator detection device. (4) The defective insulator detection device according to claim 3, wherein the voltage divider is connected to an electrical/optical conversion measuring device via a BSO sensor and an optical fiber cable.