Hey everyone, I’m Echo, and I’ve been working with voltage transformers (VTs) for 12 years.From learning how to wire and do error tests under my mentor’s watchful eye, to now participating in all kinds of smart substation projects — I’ve seen the power industry evolve from traditional systems to fully digital ones. Especially in recent years, more and more 220 kV GIS systems are adopting electronic voltage transformers (EVTs), slowly replacing the old-school electro

In power systems, voltage transformers in GIS (Gas Insulated Switchgear) play a crucial role in voltage measurement and relay protection. Selecting the right model and installing it correctly is vital for the stable operation of the equipment. The following points should be noted regarding selection and installation.I. Key Points for Selection(1) Matching Rated ParametersVoltage Level: It must be consistent with the voltage level of the GIS system. For example, 110kV and 220kV GIS systems requir

1. Causes of ResonanceA 500kV GIS switching station is designed following the principle of “primary equipment intelligence and secondary equipment networking”. The PT high - voltage side has no disconnector and is directly connected to the bus GIS. Through the analysis of fault recording diagrams, when the 5021 circuit breaker opens, the fracture capacitance and PT form a series circuit. Moreover, the bus voltage, after being paralleled by the PT inductance, shows inductive character