Medium Voltage Bushing

INDISOL, a specialized manufacturer, offers tailored epoxy insulators and GIS bushings for circuit breakers, fuse housing, gas-insulated switchgear (GIS), air-insulated switchgears (AIS), capacitors, and transformers. In fact, we actively support your epoxy insulator and medium voltage bushing development, including customized epoxy housing for MV switchgear. Furthermore, this development is backed by a comprehensive testing regimen. Specifically, it covers electric serial tests, x-ray testing, gas-leakage testing, and customer-specific inspections. As a result, our solutions deliver safety and reliability. In addition, within the realm of SF6 insulated T&D equipment, our focus on critical components such as the medium voltage bushing ensures superior performance. Therefore, through rigorous testing at 100% industrial frequency, partial discharges, and X-ray examinations, we guarantee maximum safety.

Switchgear Bushings

• Essential Insulation: Bushings act as a crucial insulator when high-voltage lines pass through grounded metal enclosures in switchgear. Indeed, these enclosures are typically at ground potential.

• Connection Points: Primary disconnect bushings are vital components. They act as connection points to energize the network on the outgoing side (downstream) of the switchgear. Because of this, they are constantly exposed to voltage. Consequently, they are the most likely candidates for electrical breakdown between the conductor and the surrounding grounded metal.

Transformer Bushings

• Insulating Conductors: Transformer bushings are insulators that allow energized conductors to safely pass through the grounded transformer tank.

• Bushing Types:

  • Bar-type bushings: Have a built-in conductor.

  • Draw-lead or draw-rod bushings: Allow for a separate conductor to be installed through the centre.

• Solid vs. Capacitance-Graded:

  • Solid bushings: Simpler and often made of porcelain or epoxy. For example, they are commonly used for connecting the low-voltage windings of transformers to the outside.

  • Capacitance-graded bushings: Used for higher voltage systems. In particular, they have an inner shield that manages the electric field, preventing uneven stress and breakdowns in the insulation.

Indisol Bushing Testing Capabilities

Indisol medium voltage bushings undergo rigorous electrical testing to ensure their reliability and safety. Above all, our priority is long-term performance. Specifically, we perform the following tests in-house:

• Industrial Frequency Tests (up to 150 kV): Verify the bushing’s ability to withstand the continuous voltage during operation.

• Partial Discharge Tests (up to 150 kV): Detect and measure partial discharges within the bushing’s insulation. In this way, it reveals potential weaknesses or early signs of degradation.

Ultimately, by performing these comprehensive electrical tests, Indisol ensures that our bushings meet the highest quality standards. Therefore, they provide safe and reliable operation for your switchgear and transformers.

📩 Contact us today for more information.