Property Specification

Type: High-Precision Outdoor Single-Phase Inductive Current Transformer

Features: Engineered for high-accuracy electrical grid measurement and protection across maximum system voltages of 72.5 kV, 123 kV, and 145 kV at 50 or 60 Hz frequencies. Built using a top-core housing architecture, the active operational components are enclosed within a hermetically sealed head compartment filled with non-hazardous. This head-type construction provides elevated thermal and dynamic short-circuit withstand performance while accommodating a wide selection of primary current ratings and secondary winding configurations.

Applications: High-accuracy utility revenue billing and metering infrastructure, power grid protective relaying and security systems, and real-time transmission grid control and monitoring networks.

Description

Key Technical Performance Specifications

Rated Maximum System Voltage	72.5 kV	123 kV	145 kV
Power-Frequency Withstand Voltage ( $50\text{ Hz} / 60\text{ s}$ )	140 kV	230 kV	275 kV
Lightning Impulse Withstand Voltage ( $1.2/50\ \mu\text{s}$ )	325 kV	550 kV	650 kV
Rated System Grid Frequency	50 / 60 Hz	50 / 60 Hz	50 / 60 Hz
Minimum Specific Creepage Distance	16 / 20 / 25 / 31 mm/kV	16 / 20 / 25 / 31 mm/kV	16 / 20 / 25 / 31 mm/kV
Total Assembly Mass	Up to 420 kg (360* kg)	Up to 420 kg (360* kg)	Up to 420 kg (360* kg)
PCB-Free Insulating Oil Mass	Up to 90 kg	Up to 90 kg	Up to 90 kg
Operating Ambient Temperature Limits	-40°C to +40°C	-40°C to +40°C	-40°C to +40°C
Standard Installation Altitude	$\le 1000\text{ m}$	$\le 1000\text{ m}$	$\le 1000\text{ m}$
Relative Humidity Limit	Up to 100% at +30°C	Up to 100% at +30°C	Up to 100% at +30°C