By Oliver, 8 Years in the Electrical IndustryHi everyone, I'm Oliver, and I've been working in the electrical industry for 8 years.From early days doing substation equipment commissioning to now managing protection and metering configurations for entire distribution systems, one of the most frequently used devices in my work has been the Current Transformer (CT).Recently, a friend who's just starting out asked me:“How do you test current transformers? Is there a simple and effective way to

Practical Experience Sharing from an Electrical Engineer in the FieldBy James, 10 Years in the Electrical IndustryHi everyone, I'm James, and I've been working in the electrical industry for 10 years.From early involvement in substation design and equipment selection, to later taking charge of relay protection and automation system commissioning for entire projects, one of the most frequently used devices in my work has been the current transformer (CT).Recently, a friend who's just starting out

As a front - line power operation and maintenance worker, I deal with current transformers (CTs) daily. Having witnessed the popularization of new photoelectric CTs and tackled numerous faults, I’ve gained practical insights into their application and testing improvements. Below, I’ll share my on - site experience with new CTs in power systems, aiming for a balance between professionalism and practicality.1. Application of New CTs in Power Systems1.1 CTs in Power SystemsMost new CTs

As a front - line fault maintenance worker, I deal with current transformers (CTs) daily. A CT’s secondary winding in operation must never open - circuit! Once open - circuited, the secondary current and demagnetizing potential vanish. All primary - side magnetic potential then becomes the iron core’s exciting potential, sharply increasing its magnetic flux density. High voltage on the secondary side will endanger safety anytime.Despite strict power operation regulations, user electr

Transformer Selection Criteria: Essential Factors for Optimal PerformanceSelecting the appropriate transformer is critical for ensuring power distribution reliability across industrial, commercial, and residential systems. This process requires meticulous evaluation of load dynamics, environmental constraints, and regulatory standards. Below we outline key selection criteria to guide engineers and designers in making informed decisions.1. Maximum Demand AssessmentThe transformer’s capacity (kVA)

As a front - line maintenance technician, I deal with current transformers (CTs) daily. CTs convert high - magnitude primary current to low - magnitude secondary current for substation/line protection and measurement, operating in series long - term. However, they face faults from external (unbalanced loads, wrong wiring, etc.) and internal (insulation defects) issues. These faults, like secondary open - circuits or insulation breakdown, harm measurement accuracy, protection operation, and grid