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Products Electrical & Grid Transformer Accessories
FRP Capacitive Transformer Bushing
Brand: WISHPOWER
Standard: GB/T 19519-2014, IEC 61109
System Voltage (kV): 12 to 550kV
Features: The injection process is adopted, the core rod and the sheath are bonded seamlessly, the internal insulation performance is good, and the interface breakdown phenomenon can be avoided
Lightweight, Durable, High-strength, Weather-resistant, Low-maintenance, High-voltage
Material: FRP tube, High-quality silicone rubber, Hot-dip galvanized steel, others
Color: Red, Grey, Blue, Yellow, Other
Customization method: According to your drawings or other requirements
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DESCRIPTION

Main Technical Performance Indicators

Nominal voltage (kV) 10 20 35 52 66 110 145 170 220 330 400 500
Rated voltage (the highest voltage of the equipment) (kV)   12 24 40.5 52 72.5 126 145 170 252 363 420 550
Frequency withstand voltage (kV/min) Dry 30 55 95 105 155 255 305 355 505 625 750 870
Wet 28 50 80 95 140 230 275 325 460 535 / /
Thunder impulse withstand voltage (kV) Whole wave 75 125 200 250 325 550 650 750 1050 1175 1550 1800
Intercepted wave / 137.5 220 275 357.5 605 715 825 1155 1293 1705 1980
Switching impulse wet withstand voltage (kV) / / / / / / / / 850 950 1175 1300
Dielectric dissipation factor Maximum At 1.05Um, the lower limit should not be over 0.4%
Increment At 1.05Um, the variation to Um should not be over 0.1%
Test tap insulation level (kV/min) 3
local discharge (pC) Um ≤10
1.05Um/√3 ≤5
leakage test 0.6MPa/20min without leakage
Thermal short-time current 25 times the bushing rated current, the maximum is 100kA, and lasts 2S
Outdoor creepage extender 50
Outdoor creepage extender There will be large and small creepage extenders. Nominal creepage distance complies with the
requirement of GB/T26218.

If you want to get more information about the product, please contact info@wishpower.net for more support.

 

What is FRP Capacitive Transformer Bushing?

FRP Capacitive Transformer Bushing is an insulating component through the earth enclosure of a transformer, which permits the secure and smooth passage of the electrical conductors between grounded enclosures. This bushing is made of fiber-reinforced polymer (FRP) to provide outstanding mechanical strength, low weight, and resistance to moisture, UV exposure, and chemical corrosion. Using the capacitive design, our product incorporates advanced dielectric grading to evenly spread the electric field and minimize stress where electric field stress is at the highest levels — increasing reliability and reducing the risk of partial discharges or insulation breakdown. A combination of the FRP core and layers of high-quality insulation materials account for long-term operational stability even under extreme electrical and mechanical stress. For applications using power transformers that are subject to severe environments, this type of bushing is well suited, combining durability with exact electrical performance. Furthermore, the material properties of the FRP enable superior performance in comparison to traditional materials, such as porcelain, concerning impact resistance and ease of installation.

 

 

Can FRP Capacitive Transformer Bushings be used for all transformers?

However, FRP capacitive transformer bushings are very versatile and can be used on a variety of transformers, provided that equipment design, voltage class, and operating environment meet specific design considerations. Because of their excellent dielectric properties, lightweight construction, and resistance to harsh environments, these bushings are particularly suitable for high-voltage transformers.

 

However, not all transformers may utilize FRP capacitive bushings. For example:

Low-Voltage Transformers: It’s these that don’t usually need capacitive bushings, as insulation needs aren’t so critical.

Specialized Transformers: Sizes, material preferences, or specific technical standards may dictate that the transformer designed for a specific application is designed with different bushing designs.

Wherever possible, FRP capacitive bushings are compatible with all types of transformers, but their use is ideal for high voltage and medium voltage transformers that can operate in harsh environments, and where high reliability, advanced electric field management, and environmental durability are needed. The transformer’s voltage rating and the desired apparatus insulation should combine to specify the proper selection.

 

Precautions

  1. Altitude:

Applicable to areas with an altitude of 2000m or less. When the altitude exceeds 2000m, the technical conditions shall be negotiated by both parties

  1. Ambient temperature:

Applicable to a maximum temperature not exceeding +50℃ and a minimum temperature not less than -50℃. When the temperature exceeds this range, the technical conditions shall be negotiated by both parties

  1. Installation angle: Can be installed at any angle
  2. Pollution level: Can be used in heavy pollution areas above level III
  3. Electrical parameters:

Rated voltage, rated current, rated frequency, external insulation creepage distance and insulation clearance, oil end length, cable length (very important), CT installation position length (very important)

  1. Environmental parameters: ambient temperature, altitude, pollution level

Note: The size of the FRP Capacitive Transformer Bushing flange and terminal block can be specially designed according to the requirements of the transformer manufacturer, and can also provide substitutes for the user’s original bushing.

 

Certificate

 

Factory

 

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