Temperature rise distribution at the drawlead cables in the condenser bushings was studied with a thermal model and actual thermal tests. Temperature rise of the hottest spot at the cables from the model is consistent with that from the tests within a 10% deviation.
The existing pollution test procedure described in ANSI C62.1 is not sufficient for metal oxide arrester designs. This paper describes alternatives to the standard ANSI pollution test and illustrates the results of those alternative tests when performed on station class metal oxide arresters.
An experimental thermal siphon bushing was constructed and tested. The thermal siphon was made from the hollow conductor of a paper-resin bushing with water as heat transport fluid. The test shows that this bushing has almost uniform temperature distribution under its critical current and the temperature of its hottest spot is close to the boiling temperature of water.
We have developed an accurate but simple method to estimate the temperature rise (referred to as "rise" hereafter) of a bushing conductor under any load condition. This method consists of one equation and two predetermined rise profiles.
This paper discusses C1 power factor of a condenser bushing with resistance graded (RG) porcelain and proposes a method to obtain the intrinsic power factor of the RG bushing.
High voltage bushings are devices designed to transmit electric energy through a grounded barrier. The barrier could be a wall, a floor, or most commonly, a transformer or circuit breaker tank. In the simplest case, a piece of insulated wire could be inserted through a hole and provide the required insulation. If the apparatus inside the grounded enclosure needs to be scaled to protect it from the environment, then the wire has to pass through some device to provide a seal around the entrance. This device becomes a bushing.
There has been increased global interest recently in identifying opportunities to cons erve energy by reducing consumption, both in the residential and commercial areas. One such energy savings opportunity, in the utility environment, relates to the large number of gapped Station and Intermediate Class silicon-carbide (SiC) arresters still installed on utility high voltage systems.
Utilities have expressed concern recently about the electrical integrity and performance capability of the large number of gapped siliconcarbide arresters that they currently have installed on their operating system.
This paper explains why the effect of bushings on the measurement of power factor of transformer insulation is usually negligibly small. This paper also presents a simple method of eliminating the bushing effect entirely from the measured power factor of transformer insulation and bushing together although it is not necessary to do so in most cases.
This paper introduces a new distribution-class arrester design concept. Replacing the conventional gasket-sealed porcelain housing is an epoxy/fiberglass-wrapped MOV disc module assembled inside a flexible EPM rubber housing.
This paper introduces the first commercially available polymer enclosed intermediate class metal oxide surge arrester.
This paper examines performance characteristics of existing distribution class arrester ground lead
disconnecting devices. The paper also introduces a new Distribution Class ground lead disconnector design that not only extends the claimable detonation range well below the 20 amps specified in industry standards, but is very durable when exposed to severe arrester durability tests.
Hubbell Power Systems contracted with NEETRAC to perform protective level testing
per IEEE C62.11-2005 Standard on Cooper Power Systems Type URT Evolution surge arresters.
As of 2007, non-ceramic composite insulators have been commercially available for
more than 30 years. Their operating experience has served as a learning curve for
both manufacturers and utilities.