Indoor Single-Pole Cast Resin Voltage Transformer (3.6–36kV )

Property Specification

Type: Medium-Voltage Indoor Epoxy Cast Single-Pole Insulated Potential/Voltage Transformer (3.6 kV up to 36 kV)

Features: Solid-cast epoxy insulation suited for nominal system insulation voltages ranging from 3.6 kV up to 36 kV. Engineered with a standard continuous overvoltage capability of 1.9 X Un for 8 hours. Accommodates up to 4 secondary windings (typically configured with 2 or 3) dedicated to star-connected metering/protection circuits or open-delta earth-fault monitoring, with optional 4 star-connected winding builds. Features a primary terminal insulated to full voltage ratings alongside an earthed primary lead. Position-independent design allows mounting in any orientation via a 4-point base frame with an M8 grounding terminal and a cast secondary terminal block protected by a transparent, sealable cover.

Applications: Indoor medium-voltage switchgear and controlgear assemblies, power distribution substations, utility grid monitoring systems, secondary voltage measurement and protection schemes, and open-delta residual voltage detection networks.

Description

Technical Product Range & Performance Matrix

Technical Parameter / Feature Category Indoor Voltage Transformer Specifications
Highest Equipment Voltage (Um)

Low-Voltage Range: 3.6 kV – 12 kV

Medium-Voltage Range: 12 kV – 17.5 kV

High-Voltage Range: Up to 36 kV

Power-Frequency Withstand Voltage (1 min)

Low-Voltage Range: 10 kV – 28 kV

Medium-Voltage Range: 28 kV – 38 kV

High-Voltage Range: 70 kV

Lightning Impulse Withstand Voltage

Low-Voltage Range: 40 kV – 75 kV

Medium-Voltage Range: 75 kV – 95 kV

High-Voltage Range: 170 kV

Rated Primary Voltages

3/√3 kV, 3.3/√3 kV, 6/√3 kV, 6.6/√3 kV, 10/√3 kV, 11/√3 kV, 13.8/√3 kV, 15/√3 kV, 30/√3 kV, 33/√3 kV, 35/√3 kV

(Custom primary voltages available upon request)

Rated Secondary Voltages & Accuracy Classes

Secondary Voltages: 100/√3 V, 110/√3 V (custom voltages available on request)

Metering Classes: 0.2, 0.5, 1

Protection Classes: 3P, 6P

Open-Delta / Residual Winding Ratings

Voltages: 100/3V, 110/3 V (custom voltages available on request)

Accuracy Class: Class 6P

Thermal Burden Capability: 50 VA – 200 VA / 6P

Maximum Output Burdens

Class 0.2: 30 VA – 50 VA

Class 0.5: 100 VA – 150 VA

Class 1: 200 VA

Operational Frequency Limits 50 Hz, 60 Hz