Electrical Engineering Guides

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 Common Failures of AIS Voltage Transformers?

Hey everyone! I rsquo;m Felix, a 10-year veteran in the power system industry. Today, we rsquo;re going to dive into an important topic mdash; what are the common failures of Air Insulated Switchgear (AIS) voltage transformers? How do you identify these issues, and how can they be resolved? Let rsqu

By Felix Spark 07/14, 2025
AIS CT

Fault Analysis and Diagnosis on Current Transformer

Current transformers are numerous in substations and are key equipment to ensure the normal operation of the system. If a current transformer fails, it will cause the circuit breaker to trip and may even evolve into a power outage event, which will have an adverse impact on the safe and stable opera

By Felix Spark 07/14, 2025
AIS CT

What does the maintenance of current transformers involve?

Fault Prevention and Handling of Current Transformers 1 Handling of Oil Leakage in Current Transformers Oil - immersed current transformers are most prone to oil leakage. Common oil - leakage parts mainly include the secondary outlet box, the upper and lower sealing surfaces of the porcelain sleeve,

By Felix Spark 07/14, 2025
AIS CT

What does the maintenance of current transformers involve?

1 Basic Operation Requirements The technical parameters of current transformers shall meet the actual operation needs. Carefully check the nameplate of the current transformer to confirm whether its technical parameters meet the requirements. Current transformers for metering must be selected with r

By Felix Spark 07/14, 2025
AIS CT

What are the common faults of current transformers in air-insulated switchgear?

Hey everyone, I'm Felix, and I've been working in the power system field for 10 years. From following senior engineers on-site to leading teams handling various substation equipment failures, I rsquo;ve worked with many types of current transformers (CTs), especially those used in air insulated swit

By Felix Spark 07/12, 2025
Outdoor VT/ PT

Analysis and Handling of Metering Abnormality of 35 kV Outdoor Combined Transformer

1. Introduction Frequent occurrences of PT burnout and primary - side fuse melting in combined transformers lead to inaccurate energy meter measurement and seriously threaten the safe operation of the power grid. This paper focuses on the repeated PT damage and fuse melting issues of a 35 kV combine

By Felix Spark 07/10, 2025
Outdoor VT/ PT

Analysis of an Explosion Accident of a 35 kV Voltage Transformer

Voltage transformers (PTs) consist of iron cores and winding coils, working similarly to transformers but with small capacity. They convert high voltage to low voltage for protection, measurement and metering devices, widely used in plants/stations. Classified by insulation: dry - type ( le;6 kV), c

By Felix Spark 07/10, 2025
Outdoor CT

What Tests Does a Qualified Outdoor Current Transformer Need to Pass?

Hey everyone, I rsquo;m Oliver, and I rsquo;ve been working in current transformer (CT) testing for 8 years. From running around with test equipment on site to now leading full inspection teams, I rsquo;ve seen how thousands of outdoor CTs go through a whole series of tests mdash; like going through

By Oliver Watts 07/09, 2025
Outdoor CT

What are the methods to reduce the failure rate of outdoor current transformers?

1. Research Reasons and Background 1.1 Importance of Current Transformers Current transformers play the role of current transformation and electrical isolation. They convert the large current of the primary system into a proportional small secondary current, which is supplied to measuring instrument

By Felix Spark 07/09, 2025
GIS PT

What are the causes of the breakdown and burning of the 35 kV GIS voltage transformer?

1. Accident Overview 1.1 Structure and Connection of 35kV GIS Switchgear Voltage Transformer The ZX2 gas-insulated double-bus switchgear, manufactured in March 2011 and officially put into operation in July 2012, is configured with two groups of bus voltage transformers (PTs) for each bus section. T

By Felix Spark 07/08, 2025
GIS PT

An GIS Equipment Explosion Accident Caused by PT Secondary Wiring Errors

1. Accident Overview A newly - built 110kV substation rsquo;s GIS exploded during commissioning due to a PT secondary circuit short - circuit. Though the cause was simple, consequences were severe, warranting reflection. 2. Accident Process On the power - transmission day: The upper - level power su

By Felix Spark 07/08, 2025

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

What Are the Common Failures of AIS Voltage Transformers?

Fault Analysis and Diagnosis on Current Transformer

What does the maintenance of current transformers involve?

What does the maintenance of current transformers involve?

What are the common faults of current transformers in air-insulated switchgear?

Analysis and Handling of Metering Abnormality of 35 kV Outdoor Combined Transformer

Analysis of an Explosion Accident of a 35 kV Voltage Transformer

What Tests Does a Qualified Outdoor Current Transformer Need to Pass?

What are the methods to reduce the failure rate of outdoor current transformers?

What are the causes of the breakdown and burning of the 35 kV GIS voltage transformer?

An GIS Equipment Explosion Accident Caused by PT Secondary Wiring Errors

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