Voltage Transformer A voltage transformer (abbreviated as PT), similar to a transformer, is an instrument used to transform voltage. The primary purpose of a voltage transformer's voltage transformation is to supply power to measuring instruments and relay protection devices.

Participating in the Vietnam Exhibition in 2024

The 2025 35 kV voltage transformer metrology comparison project, led by the Standard Instrument Transformer Laboratory of the Electric Energy Measurement Supervision Center of the Inner Mongolia Electric Power Research Institute, completed full-region on-site transmission and testing over a two-month period. The comparison, covering 11 power supply units under the Inner Mongolia Electric Power Group, employed a "petal-shaped" dual-route transmission scheme. The goal was to establish a unified measurement value transmission system across the region and provide technical support for fair settlement of electricity trade. Final data processing and report generation will be completed in September.

Current transformers are important devices used for measurement and protection in power systems. Their working principle is based on the law of electromagnetic induction. The core is to achieve the conversion of large current on the primary side to small current on the secondary side through electromagnetic coupling, which facilitates measurement, protection and monitoring.

Selecting a suitable current transformer requires comprehensive consideration of multiple factors such as power system parameters, application scenarios, and accuracy requirements to ensure its safe and reliable operation and meet functional requirements such as measurement and protection.

The accuracy grade of a current transformer is a key indicator of the accuracy of its measurement or protection performance. Different grades correspond to different tolerances, and the selection should be based on the specific application (metering, measurement, protection). The following is a classification of common accuracy grades and detailed descriptions:

Current transformers of different accuracy grades vary in price. Generally speaking, higher accuracy grades increase prices, but the extent of this difference varies depending on factors such as product specifications and type.

Power instrument transformers (including current transformers and voltage transformers) are essential, critical equipment in power systems. Their core function is to safely convert high voltages and high currents to the low voltages and low currents required by measurement and protection equipment. They offer several significant advantages