Practical technical solution for new type of capacitor voltage divider

Author： GOZ Electric Time：2024-06-07 09:26:19 Read：12

The utility model relates to power equipment, specifically a capacitive voltage divider. According to the technical solution provided by the utility model, a high-voltage capacitor and a low-voltage capacitor are stacked together, and the high-voltage capacitor and the low-voltage capacitor are located in an insulating outer sleeve, an expander is provided on the insulating outer sleeve, a cover shell for sealing is provided outside the expander, and alkylbenzene insulating oil is provided in the insulating outer sleeve, which is characterized in that the insulating outer sleeve includes a cylindrical high-strength electric porcelain sleeve and a plurality of annular silicone rubber umbrella skirts surrounding the outside of the high-strength electric porcelain sleeve. The utility model improves the insulation level and anti-fouling ability of the capacitive voltage divider by reorganizing the material of the insulating shell of the capacitive voltage divider, and solves the old problem that the insulating umbrella skirt is easy to be damaged.

Technical field

The utility model relates to power equipment, specifically a capacitive voltage divider. Background technology The capacitive voltage divider is a voltage transformer composed of a capacitive voltage divider and an electromagnetic unit. In the prior art, since the insulating shell of the capacitive voltage divider is integrally cast with electric porcelain material, its porcelain sleeve shed has weak creepage performance and insulation withstand voltage level in a specific dirty environment, and is easily damaged during transportation and maintenance. The insulating sleeve is large in size and filled with relatively more insulating oil.

Content of the invention

The purpose of the utility model is to design a capacitive voltage divider. By reorganizing the material of the insulating shell of the capacitive voltage divider, the insulation level and anti-fouling ability of the capacitive voltage divider are improved, and the old problem of easy damage of the insulating shed is solved.

According to the technical solution provided by the utility model, the high-voltage capacitor and the low-voltage capacitor are stacked together, and the high-voltage capacitor and the low-voltage capacitor are located in the insulating outer sleeve, an expander is provided on the upper side of the insulating outer sleeve, a sealing cover is provided on the outside of the expander, and alkylbenzene insulating oil is provided in the insulating outer sleeve, which is characterized in that the insulating outer sleeve includes a cylindrical high-strength electric porcelain sleeve and a plurality of annular silicone rubber sheds surrounding the outside of the high-strength electric porcelain sleeve.

There is a mounting flange at the bottom of the insulating outer sleeve, and there are medium and low voltage lead-out sleeves on the mounting flange. There are high-voltage end fittings on the top of the cover. The annular silicone rubber shed includes a large silicone rubber shed with a larger outer diameter and a small silicone rubber shed with an outer diameter smaller than the large silicone rubber shed, and the large silicone rubber shed and the small silicone rubber shed are stacked and arranged alternately.

The advantages of its capacitor voltage divider are:

1. The insulating sleeve for placing the capacitor element is composed of a high-strength electric porcelain sleeve and a silicone rubber shed, which has the characteristics of light weight, not easy to break, and enhanced external insulation withstand voltage level;

2. Its capacitor voltage divider places the metal expander (FT) outside the voltage divider. Due to the oil volume adjustment function of the FT, even if the temperature changes from -40℃ to +40℃, the pressure inside the porcelain sleeve can maintain a pressure slightly higher than the atmospheric pressure of 5Kpa, and it is not easy to leak oil. Once the capacitor fails, the FT can also play a protective role when the internal pressure is too high.

3. The lead-out terminal of its capacitor voltage divider is improved with epoxy castings, so the terminal shaft will not leak oil, and because the material is not hydrophilic, the insulation level will not be reduced.

The characteristics of this capacitor voltage divider are: light weight and small size; the changes in capacitance and voltage divider ratio caused by temperature changes are extremely small and can be ignored; the metal expander is external, the internal pressure is kept slightly positive, and it is not easy to leak oil; the capacitor inductance component is small, which is conducive to line carrier communication. The loss tangent value is low, the partial discharge is extremely small, and the service life is long. The medium and low voltage lead-out ends use non-partial discharge epoxy casting one-piece sleeves, and there is no oil leakage. The high-voltage end uses an anti-corona aluminum alloy cap and is conducive to high-voltage connection.

Its capacitor voltage divider is oil-filled and fully sealed, and does not require any special treatment such as oil filtering and oil change to maintain the original electrical performance. If the electromagnetic unit has to take oil samples, it must be replenished in time, and the amount taken must be replenished. The mounting flange 9 of the porcelain sleeve is hot-dip galvanized, and the surface of the oil tank is hot-dip galvanized or coated with high-quality anti-rust paint.

The outer insulating sleeve of the capacitive voltage divider affects the mechanical strength, voltage resistance level and anti-fouling level of the voltage divider. The biggest difference between the utility model and the ordinary OWF capacitive voltage divider is that the structure combining high-strength porcelain and silicone rubber is selected for the material selection of the insulating jacket. By utilizing the advantages and characteristics of the material, the weight of the insulating jacket of the utility model is reduced by 40% compared with the original OWF capacitive voltage divider, and the problem of the original porcelain sleeve being easy to break is solved, which is convenient for transportation and daily maintenance. At the same time, the silicone rubber umbrella skirt has a good moisture and anti-fouling ability, which enhances the insulation level of the capacitive voltage divider shell and improves the external insulation withstand voltage level of the capacitive voltage divider. The insulating outer jacket of the utility model has a strong anti-fouling ability and sufficient mechanical strength, and can withstand standard wind loads, line electric power and gravity in a relatively harsh environment, and can withstand an 8-degree earthquake.