voltage transformer-XinYa China manufacturer
China voltage transformer Supplier,Factory 27 years in GuangDong
By Xinya Power editorial team
Voltage Transformer: Technical Overview for Measurement and Protection
A voltage transformer, also known as a potential transformer, is an instrument transformer used to step down high system voltages to standardized secondary values for metering, protection, and monitoring. Typical secondary outputs are 110 V, 115 V, 120 V, or 100 V, depending on regional standards and application requirements. Voltage transformers are widely used in substations, power distribution networks, industrial plants, renewable energy stations, and utility switching facilities. The main function of a voltage transformer is to provide an accurate voltage signal that is proportional to the primary system voltage while maintaining electrical isolation between high-voltage circuits and low-voltage instruments. This allows protective relays, energy meters, control devices, and monitoring systems to operate safely and reliably without direct exposure to high voltage. Voltage transformers are available in electromagnetic, capacitive, and dry-type designs. Electromagnetic voltage transformers are commonly used in medium-voltage applications, while capacitive voltage transformers are often applied in high-voltage transmission systems. Indoor units may use epoxy resin insulation, and outdoor units are typically designed with weather-resistant housings and porcelain or polymer insulators. Important technical parameters include rated primary voltage, rated secondary voltage, accuracy class, burden rating, frequency, insulation level, thermal rating, and short-time withstand capability. Accuracy classes for metering applications require higher precision, while protection-class voltage transformers are designed to maintain performance during fault conditions. Selection should be based on system voltage level, neutral grounding method, installation environment, and applicable IEC or IEEE standards. Proper installation, secondary circuit protection, and periodic verification of ratio accuracy and insulation condition help maintain measurement reliability and system safety.
China XINYA Power Cables Co., Ltd Email: [email protected] Email: [email protected] whatsapp: +86 15289885778 Website: https://www.supplytransformer.com
