JPH0785367B2 - Lightning arrester device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is capable of preventing a ground fault accident when a lightning surge current flows through a transmission line by promptly discharging it to the ground and suppressing and shutting off the subsequent current. It is to provide a lightning protection insulator device that can be used.

[0002]

2. Description of the Related Art Conventionally, a grounding-side end of a lightning arrester having a built-in resistance element having a non-linear voltage-current characteristic is connected to a steel tower, and a power transmission line is supported at the end of the lightning arrester on the power-supply side. In the gapless type lightning protection device, when the lightning protection is deteriorated or the lightning protection becomes conductive due to an unexpected large-scale lightning surge current, the arc emitted from the lightning protection is captured and arced. It moves between the horns to prevent disconnection of the entire lightning protection insulator.

[0003]

Since the resistance element built in the lightning protection insulator is always kept in the voltage applied state, the voltage application side and the grounding side have a higher voltage application rate than the intermediate part.
Therefore, the voltage sharing ratio acting on the resistance element is high on the voltage application side and the grounding side, the resistance element is likely to be deteriorated early, and the life of the lightning protection insulator is shortened.

In order to keep the AC voltage application life of the resistance element at the same level as that of the C characteristic lightning arrester (A.V.R. 85%, 40 ° C., 100 years), it is necessary to suppress the shared potential.
A 0 kV lightning protection insulator requires a shield ring of about 2 mφ. Therefore, in the suspension type lightning insulator for 500 kV, it is necessary to design the ring coordinate and shape in consideration of the electric field relaxation element and the insulation clearance of the electric field relaxation ring with respect to the steel tower.

Therefore, the dimensions of the suspension device, the tension device, and the electric field relaxation ring of the V suspension device of the suspension type lightning arrester device for 500 kV and the horn of the conventional insulator device were compared in size. Compared with the conventional horn, it protrudes about 200 mm in the line direction and about 650 mm in the tower side direction. Further, in the tension resistant device, as compared with the conventional horn, the protrusion is about 600 mm on the upper phase side and about 750 mm on the jumper wire side in the line direction. Further, in the V-suspension device, compared with the conventional horn, the upper arm of the steel tower and the tower are each about 720
mm protrude. As a result, when the electric field relaxation ring is attached to the existing steel tower, there is a problem that the insulation clearance is insufficient and the electric field relaxation ring cannot be applied.

An object of the present invention is to reduce the charge rate of the resistance element to a predetermined value or less, to improve the life of the lightning protection insulator, and to secure the insulation clearance from the existing steel tower to enable its application. Another object of the present invention is to provide a lightning protection insulator device.

[0007]

Means for Solving the Problems] In this invention to achieve the above object, the voltage with respect to pylon - double current characteristic nonlinearity
Number of resistance elements are built in, and the grounding side end of the lightning protection insulator is connected, and a power transmission line is supported at the powering side end of the lightning protection insulator, and the powering side end and / or the grounding side end of the lightning protection insulator On the other hand, in a lightning arrester device in which an electric field relaxation ring for reducing the share of the voltage applied to each of the resistance elements is arranged , the distance from the central axis of the lightning arrester to the side is defined as X coordinate.
However, the distance from the lower end of the lightning insulator to the grounding side or the lightning strike
When the Y coordinate is the distance from the lower end of the insulator to the grounding side , the X and Y coordinates of the electric field relaxation ring and the overall shape thereof
The Jo to prevent flashover between the said by that lightning insulator and the electric field relaxation ring control voltage of the resistance elements, the horizontal axis
And the position in the Y coordinate direction from the end on the voltage applying side or the end on the grounding side.
And the vertical axis indicates the voltage component shown by taking the voltage share of each resistance element.
Normally, each resistance element will share, based on the curve
Multiply the peak value of the applied voltage by the voltage share of the applied voltage
This peak value is the value of the operation start voltage of each resistance element.
The means is set so that the charge rate of each resistance element obtained by dividing by is set to an appropriate value .

[0008]

According to the present invention, since the electric field relaxation ring is arranged at the coordinate position in consideration of the limiting voltage and the charge rate of the resistance element, the charge rate of the resistance element is reduced to a predetermined value or less and the life of the resistance element is improved. In addition, the size of the electric field relaxation ring can be set to a necessary minimum, and the size and weight can be reduced. Furthermore, the electric field relaxation ring can be easily attached to the existing steel tower because the insulation clearance can be easily secured.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is embodied as a tensioning device for a suspension type lightning arrester device will be described with reference to FIGS. As shown in FIGS. 2 and 3, a suspension armature series 4 and a suspension type lightning protection insulator 5 are connected in series to a support arm 1 of a steel tower by connecting a large number of normal suspension insulators 3 in series via a ground side connecting metal fitting unit 2. The suspension type lightning protection insulator 6 which is connected is connected in parallel with each other. Further, a power transmission line 8 is connected to the power-supply side of both the insulator chains 4 and 6 via a power-supply-side connecting metal fitting unit 7. In addition, a jumper wire (not shown) is connected to the connecting fitting unit 7 on the charging side.

As shown in FIG. 3, the ground side connecting metal fitting units 2 and 2 are connected to the ground side arm rings 11 and 11, respectively.
Is supported. Similarly, the power supply side connecting bracket unit 7,
The arcuate side arc rings 12 and 12 for catching the creeping flashover of the suspension insulator series 4 or the suspension type lightning arrester series 6 and suppressing damage to the insulator series 4 and 6 are supported by 7.

An elliptic electric field relaxation ring 13 is supported on the power-supply-side connecting metal fitting unit 7 so as to surround the suspension insulator series 4 and the suspension type lightning arrester series 6. The electric field relaxing ring 13 is formed into an elliptical shape as a whole by the first ring 14 and the second ring 15, and both rings 14.15 are supported by the bracket 16 on the power supply side connecting fitting unit 7.

Next, the structure of the suspension type lightning arrestor 5 alone will be described with reference to FIG. 6. This lightning arrester is an insulator body 21.
A cap metal fitting 22 fitted and fixed to the upper part of the head 21a by cement, a pin metal fitting 23 similarly fitted in the head 21a and fixed by cement, and a mounting head integrally formed on the insulator body 21. Voltage housed in 24 −
Resistor element 2 whose main characteristic is zinc oxide whose current characteristics are non-linear
5 and 5. Further, cap electrodes 26 and 27 are fitted and fixed to the upper and lower ends of the mounting head 24,
Both electrodes are connected to the cap fitting 22 and the pin fitting 23 by lead wires 28 and 29, respectively.

Next, the setting of the coordinates of the electric field relaxation ring 13 in consideration of the electric field relaxation effect of the resistance element 25 built into the lightning protection insulator and the limiting voltage of the element will be described with reference to FIG. Here, the limit voltage of the lightning protection insulator series 6 refers to a voltage generated when a current flows through the lightning protection insulator series. Also, section
The electric constant is the voltage voltage applied to the lightning protection insulator continuously and continuously.
It represents the size of the tress, and the peak value of the applied voltage is usually the lightning insulator.
It is a value divided by the value of the operation start voltage. In addition,
The work starting voltage is a small voltage-current characteristic of the lightning insulator.
The terminal voltage peak value of the lightning insulator for a given current in the current range
Say. In FIG. 4, the X-coordinate (m
m) indicates the distance from the central axis O of the lightning protection insulator series 6 to the side, and the Y coordinate (mm) indicates the distance from the lower end of the lightning protection insulator series 6 to the grounding side. Setting coordinates T shown by the solid line in FIG.
Considering the above-mentioned limit voltage, reference numeral 1 indicates a region where the electric field relaxation ring 13 does not flash over to the lightning protection insulator string 6 when the maximum discharge current acts.

Further, the set coordinate T2 shown by the broken line in FIG. 4 is appropriate when the deterioration of the resistance element 25 is suppressed by setting the maximum charging rate εmax (100%) to 75% or less. Indicates coordinates. The electric field relaxation ring 13 is a single ring, and its material diameter is 60 mmφ. In this embodiment, the coordinate position of the electric field relaxation ring 13 is set as the set coordinate T2 so that the maximum charge rate ε acting on the resistance element 25 is 75% or less.

More specifically, in FIG. 4, ◯ marks and  marks are analysis data, and ◯ marks show a case where the charge rate ε is equal to or less than 75%. Also, ● indicates that the charge rate ε is 75%.
The above is shown. Furthermore, the △ and ▲ marks are test data, and the △ mark shows that the electrification rate ε is equal to or less than 75%,
The symbol ▲ indicates that the charge rate ε is 75% or more. □ indicates the horn coordinates applied to a normal insulator, and ■ indicates (coordinates of □ + increase in the diameter of the insulator) when the same idea as the normal insulator is taken.

Now, the relationship between the electrostatic capacity and the charge factor between the electric field relaxation ring 13 and the lightning protection insulator 6 will be described. The electrostatic capacitance between each lightning insulator 5 and the electric field relaxation ring 13 in the air insulation distance is the total capacitance between the facing area of the ring 13 and each portion between the lightning insulator 5.
Due to this increase in capacitance, the rate of voltage application to the resistance element 25 can be reduced, and the life of the resistance element 25 can be improved in the constantly applied state.

FIG. 5 shows the relationship between the position of the resistance element 25 from the voltage applying end and its voltage sharing rate. As is apparent from this graph, it can be seen lower in the voltage distribution ratio higher middle portion in the ground-side end portion and the voltage application side end portion. Based on the voltage distribution curve of this, to each of the resistive elements 25 sharing
Normal applied voltage peak value
Calculate by multiplying (%). These crest values
Is divided by the value of the operating start voltage of each resistance element.
It suffices to set the X coordinate, the Y coordinate, and the overall shape of the electric field relaxation ring 13 so that the charge factor of the resistance element 25 becomes an appropriate value. When the electric field relaxation ring 13 is arranged on the ground side, the X coordinate, the Y coordinate, and the overall shape are set in the same manner.

Further, it is advantageous to arrange the electric field relaxation ring 13 at the coordinate point where the set coordinates T1 and T2 intersect as shown in FIG. 4, although it is advantageous from the viewpoint of weight reduction and size reduction of the ring 13, but in the lightning arrester device. Appropriate coordinates may be selected in consideration of the installation location or suspension, tension, difference in V suspension insulator device, and the like. Further, in this embodiment, since the electric field relaxation ring 13 is formed in an elliptical shape, the short diameter portion of the ring is opposed to the main body of the steel tower or another member, so that the insulation clearance is not reduced with respect to the existing steel tower. can do.
The shape of the electric field relaxation ring 13 can be appropriately changed to a circular shape or the like according to usage conditions.

Next, an embodiment in which the present invention is embodied in a suspension type lightning arrester device will be described with reference to FIGS. Figure 7
As shown in FIG. 3, a suspension insulator series 4 and a lightning arrester series 6 are suspended and supported in parallel with each other at the lower part of the support arm 1 via a connecting fitting unit 2. Further, a power transmission line 8 is supported by the power connection side connecting unit 7 at the lower ends of the two insulator links 4, 6.

Further, the ground side connecting metal fitting unit 2 and the charging side connecting unit 7 have ground side arc rings 11, 11 respectively.
And the power-supply-side arc rings 12, 12 are respectively supported. An electric field relaxation ring 13 having a substantially elliptical shape in a plan view is horizontally supported by the power-supply-side connecting metal fitting unit 7 so as to surround both the insulator series 4 and 6. FIG. 9 shows the evaluation result of the ring coordinates in the case of considering the electric field relaxation action of the electric field relaxation ring 13 and the limiting voltage in this suspension type lightning arrester device.

In FIG. 9, the ring coordinate is T1 when the limiting voltage is taken into consideration. Further, the ring coordinates T2 and T3 in the case of taking the charge rate ε into consideration are substantially right angles, and it is desirable to arrange the electric field relaxation ring 13 along the vertical line of the coordinate T2. Further, the diameter of the ring may be increased along the coordinate T3, but in the case of a compact and lightweight ring, the vicinity of the intersection of the coordinates T2 and T3 is desirable.

The present invention is not limited to the above-described embodiment, but may be arbitrarily modified within the scope of the present invention, for example, by applying the electric field relaxation ring of the present invention to a V-suspension type lightning arrester device. It can also be materialized.

[0023]

As described above in detail, according to the present invention, it is possible to reduce the charge rate of the resistance element incorporated in the lightning arrestor and improve the life of the element, and to adjust the coordinate position of the electric field relaxation ring appropriately. Therefore, there is an effect that the weight can be reduced and the size can be reduced, and as a result, an insulation clearance between the steel tower and other members can be secured, and the existing lightning protection insulator device can be applied.

[Brief description of drawings]

FIG. 1 is a plan view showing an attached state of an electric field relaxation ring used in a tension device of a suspension type lightning arrester device embodying the present invention.

FIG. 2 is a front view showing the entire tension device of the suspension type lightning arrester device of the present invention.

FIG. 3 is a plan view of the lightning arrester device of FIG.

FIG. 4 is an explanatory diagram of set coordinates of an electric field relaxation ring in a tension device of a suspension type lightning arrester device embodying the present invention.

FIG. 5 is a graph showing the position of the lightning protection insulator from the charging end and the voltage sharing ratio.

FIG. 6 is a semi-longitudinal sectional view showing a suspended lightning arrester.

FIG. 7 is a front view showing an embodiment in which the present invention is embodied in a suspension type lightning arrester device.

8 is a right side view of the lightning arrester insulator device of FIG. 7. FIG.

9 is an explanatory diagram showing coordinates of an electric field relaxation ring in the lightning arrester device of FIG. 7. FIG.

[Explanation of symbols]

5 suspension type lightning arrester, 6 suspension type lightning arrestor series, 13 electric field relaxation ring, 14 first ring, 15 second ring.

Claims (1)

[Claims] 1. A non-linear voltage-current characteristic with respect to a steel tower
A grounding side end of a lightning protection insulator having a plurality of built-in resistance elements is connected, and a power transmission line is supported at the power charging side end of the lightning protection insulator, and the power charging side end and / or the grounding side end of the lightning protection insulator. On the other hand, in a lightning arrester device in which an electric field relaxation ring for reducing the share of the voltage applied to each of the resistance elements is arranged , the distance from the central axis of the lightning arrester to the side is defined as X coordinate,
The distance from the lower end of the lightning insulator to the grounding side or the
The distance from the ground-side bottom to voltage application side and the Y-coordinate Then, the
X field relaxation ring, the Y-coordinate and overall shape thereof, wherein the flash-over between the I that arrester insulator and the electric field relaxation ring control voltage of the resistance elements is prevented, voltage application side end in the horizontal axis or Position in the Y coordinate direction from the edge on the grounding side
And the vertical axis represents the voltage share of each resistance element.
Each resistance element shares based on the pressure sharing curve
Normally, the peak value of the applied voltage is multiplied by the voltage share of the applied voltage.
This peak value is calculated by dividing
The electric charge rate of each resistance element obtained by dividing by
Lightning arrester insulator apparatus, characterized in that the set as.