1.Zero value self-explosion, easy to visually inspect
2.Good arc resistance performance
The surface of glass insulator which has been subject to lightning burns in service is still smooth and covered with toughened internal stress protective layer.Therefore,the product maintains enough insulating performance and mechanical strength.
3.Good self-cleaning performance and not easy to age
The glass insulator is not accumulate dirt and easy to clean. The glass insulators in typical lines will be periodically sampled for mechanical and electrical performance inspection.The result shows that the performance remains almost unchanged after years of using and no aging phenomenon has been found.
4.Large main capacitance and uniform voltage distribution in series
Dielectric constant of glass is kept between 7 and 8 lo make the main capacitance of glass insulator maintained at a relatively high level and uniformly distribute voltage to lower the voltage withstood by the insulators on the wire side and ground site, reduce the corona loss and lengthen the service life of glass insulator.
The tempered glass insulator has the characteristics of zero value self-explosion, which can be observed only on the ground observation or helicopter, and there is no on-board chip detection, saving a lot of manpower and material resources.
Why Need to Detect Glass Insulators?
Electrical glass insulators is an important part of the power system, it plays the role of supporting the wire and insulating the insulation between the wire and the support. The working principle of Electrical insulators is to use the insulation properties of insulating materials to prevent the flow of current. With the passage of time, the outdoor wind and sun, long-term voltage effect, there may be individual Electrical insulators are not insulated, can not play the role of insulation. Because the insulation of The electrical insulators is destroyed, the insulation resistance is close to 0, and the voltage value borne on The electrical insulators string is also close to 0, it is called "zero value electrical insulators". If The electrical insulators that has been broken down is not replaced in time, multiple damage will occur, and the operation is extremely dangerous. It may occur that the wire voltage will break down all the good Electrical insulators (residual Electrical insulators) and lead to single-phase grounding, affecting the normal power supply. In order to prevent the above situation, it is necessary to measure regularly and find out the bad electrical insulators. In order to ensure the continuous reliability of power supply and not power outage test, the method of measuring Electrical insulators on line can be used. At present, the gap discharge method is commonly used to test. When measuring, the two electrodes on the test rod contact the two ends of The electrical insulators (metal part), according to the size of the spark gap discharge spark to judge the quality of The electrical insulators, such as no spark, this is a zero value electrical insulators.
How to Detect Glass insulators?
The principle of spark gap detection of Electrical insulators: Whether the spark gap on the test rod can be broken down by the distributed voltage on The electrical insulators during the test operation can be used to determine whether The electrical insulators is deteriorated. The detection is mainly based on the "horn" discharge sound emitted by the gap. When the discharge sound is not heard and The electrical insulators with zero value is found, to avoid bad contact between the probe and the steel cap of The electrical insulators, or the discharge sound cannot be heard clearly in the wind, repeat the test several times to ensure correct judgment.
When using a spark gap detector to detect Electrical insulators with live power, the following requirements should be observed:
1) Before detection, the detector should be detected to ensure flexible operation and accurate measurement.
2) Pin type and suspended Electrical insulators with less than 3 pieces shall not be tested by spark gap detector.
3) When testing The electrical insulators string of 35KV and above voltage level, when the number of zero-value electrical insulators pieces in the same string is found to reach the specified number, the detection should be stopped immediately to prevent unsafe situations.
