Electrical Engineering Guides

Oil-Immersed Voltage Transformer

Core Advantages of the V-Type Two-Column Oil-Immersed Voltage Transformer

The V-type two-column oil-immersed voltage transformer is a compact outdoor device purpose-built for three-phase three-wire medium-voltage distribution networks. Its design integrates four core strengths electrical connection optimisation, mechanical integration, insulation enhancement, and engineer

By Rockwill 07/20, 2026
PartialDischarge

750kV Transformer On-Site PD and Induced Withstand Test: Case Study and Recommendations

I. Introduction The Guanting–Lanzhou East 750kV transmission and substation demonstration project in China was officially put into operation on September 26, 2005. This project includes two substations—Lanzhou East and Guanting (each equipped with four 750kV transformers, three of which form a three

By Oliver Watts 10/31, 2025
VT

Why Can't VT Be Shorted & CT Be Opened? Explained

We all know that a voltage transformer (VT) must never operate short-circuited, while a current transformer (CT) must never operate open-circuited. Short-circuiting a VT or opening the circuit of a CT will damage the transformer or create hazardous conditions. From a theoretical standpoint, both VTs

By Echo 10/22, 2025
VT

Why Are Voltage Transformers Burning Out? Find the Real Causes

In power circuits, voltage transformers (VTs) are often damaged or burned out. If the root cause is not identified and only the transformer is replaced, the new unit may quickly fail again, disrupting power supply to users. Therefore, the following checks should be performed to determine the cause o

By Felix Spark 10/22, 2025
VT

Things to Know When Operating Voltage Transformers: De-energizing and Energizing Procedures

Q:What are the Operating Sequence Rules for the Secondary Miniature Circuit Breaker and High-Voltage Power Supply During Voltage Transformer De-energizing and Energizing? A:For busbar voltage transformers, the principle for operating the secondary miniature circuit breaker during de-energizing and e

By Echo 10/22, 2025
VT

How to Operate & Maintain Voltage Transformers Safely?

I. Normal Operation of Voltage Transformers A voltage transformer (VT) may operate long-term at its rated capacity, but under no circumstances should it exceed its maximum capacity. The secondary winding of a VT supplies high-impedance instruments, resulting in a very small secondary current, nearly

By Edwiin 10/22, 2025
AIS VT/PT

What Are the Key Design Elements of 66 kV Outdoor AIS Voltage Transformers？

I. Key Elements of Mechanical Structure Design The mechanical structure design of AIS voltage transformers ensures long - term stable operation. For 66 kV outdoor AIS voltage transformers (pillar - type structure): Pillar Material: Use epoxy resin casting + metal frame for mechanical strength, pollu

By Dyson 07/15, 2025
AIS VT/PT

How Does Temperature Change Affect AIS Voltage Transformers？

Impact on Insulation Performance Changes in Insulating Material Properties : AIS voltage transformers rely on air as the insulating medium, and they also contain some solid insulating materials, such as insulating paper and insulating bushings. When the temperature rises, the migration and evaporati

By Echo 07/15, 2025
AIS VT/PT

How to Solve Single-Phase Grounding Fault Judgment for 3-Phase 4PT in Ungrounded Systems？

In 10 kV and 35 kV ungrounded systems, single - phase grounding faults cause minimal current, so protection rarely trips. Per regulations, operation is limited to 2 hours; prolonged undetected faults may worsen, even damaging switches. While the State Grid promotes small - current grounding line sel

By Felix Spark 07/15, 2025
AIS VT/PT

What Are the Essentials for Selecting and Installing 66kV Outdoor AIS Voltage Transformers？

Hey everyone! I'm James, a professional with over 10 years of experience installing voltage transformers. Today, I want to talk about the selection and installation of Air Insulated Switchgear (AIS) voltage transformers in 66kV outdoor substations. These devices are critical for measurement and prot

By James 07/15, 2025
AIS VT/PT

How is the application and development of AIS voltage transformers in 66kV outdoor substations?

Hey everyone! I rsquo;m Echo, and today we rsquo;re diving into the application and development of Air Insulated Switchgear (AIS) voltage transformers in 66kV outdoor substations. These devices play a crucial role in power systems, not just for measurement but also for protection and control. As tec

By Echo 07/15, 2025
AIS VT/PT

What Tests Are Required for a Qualified AIS Voltage Transformer?

Hey everyone! I rsquo;m Oliver, an experienced electrician with over a decade in the power system industry. Today, we rsquo;re diving into a practical topic mdash; what tests are required to ensure an Air Insulated Switchgear (AIS) voltage transformer is qualified? These tests are crucial not only f

By Oliver Watts 07/14, 2025

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Core Advantages of the V-Type Two-Column Oil-Immersed Voltage Transformer

750kV Transformer On-Site PD and Induced Withstand Test: Case Study and Recommendations

Why Can't VT Be Shorted & CT Be Opened? Explained

Why Are Voltage Transformers Burning Out? Find the Real Causes

Things to Know When Operating Voltage Transformers: De-energizing and Energizing Procedures

How to Operate & Maintain Voltage Transformers Safely?

What Are the Key Design Elements of 66 kV Outdoor AIS Voltage Transformers？

How Does Temperature Change Affect AIS Voltage Transformers？

How to Solve Single-Phase Grounding Fault Judgment for 3-Phase 4PT in Ungrounded Systems？

What Are the Essentials for Selecting and Installing 66kV Outdoor AIS Voltage Transformers？

How is the application and development of AIS voltage transformers in 66kV outdoor substations?

What Tests Are Required for a Qualified AIS Voltage Transformer?

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