Hi everyone, I’m Oliver, and I’ve been working in the instrument transformer industry for almost eight years now. From a complete newbie to someone who can now handle things independently, I’ve participated in dozens of combined instrument transformer inspections over the years.Today, I’d like to share with you: What tests must a qualified combined instrument transformer go through before leaving the factory or being put into operation? After all, it's a very critical pie

Applications and Trends of 35kV Combined Instrument Transformers – From Echo’s PerspectiveHey everyone! My name is Echo, and I’ve been working in the field of instrument transformers for 12 years now. Today, I’d like to share some insights about the applications and future trends of 35kV combined instrument transformers. Hope this can give you a glimpse into this fascinating industry.Application Scenarios: More Than Just Metering ToolsFirst off, let's talk about applicati

1 Measurement Principle of Combined Electronic Transformers1.1 Voltage Measurement PrincipleElectronic transformers measure voltage using the capacitive voltage division method. Since the voltage across a capacitor cannot change abruptly, the secondary voltage obtained directly through capacitive voltage division has poor transient response and low measurement accuracy. To improve the measurement accuracy, a precision sampling resistor is connected in parallel across the low-voltage capacitor. I

For fault diagnosis and handling of 35kV combined transformers, the following technical means can be adopted:Insulation Fault DiagnosisUse equipment such as high-voltage test transformers, power frequency withstand voltage testers, and partial discharge detection systems to conduct a comprehensive assessment of the insulation performance of combined transformers. When the insulation resistance is found to be lower than 1000MΩ or the dielectric loss factor tanδ exceeds 0.5%, an applic

This paper analyzes the above situation in - depth and summarizes technical measures to solve the problems.1. Main Problems of SPD Products in Voltage Transformer Secondary CircuitsCurrently, there are residual - current - free SPDs (switch - type lightning arresters) at home and abroad. Their main internal discharge circuits use discharge tubes/gaps, with high discharge current capacity (exceeding zinc oxide varistors). However, they have fatal flaws: poor voltage - limiting, arc - pulling volt