Free Expert Guides on Power Systems, Circuit Design & Electrical Troubleshooting

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 operation of the power grid. Taking an event of the main transformer differential protection operation caused by the failure of the current transformer on the low-voltage side of the main transformer in a

Fault Prevention and Handling of Current Transformers1 Handling of Oil Leakage in Current TransformersOil - 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, the oil tank, the base, the oil conservator, and the metal expander.Methods for handling oil leakage: For oil leakage at the secondary outlet box, if the small porcelain sleeve or terminal board is cra

1 Basic Operation RequirementsThe 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 rated loads and accuracy classes that meet the requirements in accordance with relevant metering standards. The actual load connected to the secondary winding of the current transformer shall be within

1 Role of Current TransformersCurrent transformers are used to sense the magnitude of current and isolate the primary system from the secondary system. The primary winding of a current transformer used in a power system is connected in series in the primary high - voltage system, and the secondary winding is connected to measuring instruments and relay protection devices. It induces the current in the primary high - voltage system and converts it into a low - voltage small current on the seconda

Hey everyone, I'm Echo, a 10-year veteran in the power system industry. Today we’re going to talk about an important topic — the future development trends of current transformers (CTs) used in Air Insulated Switchgear (AIS).As technology advances and market demands evolve, these critical components are also undergoing continuous innovation. In this article, I’ll walk you through the key directions of future development based on my hands-on experience and industry ob

Hey everyone, I’m Oliver, a 10-year veteran in the power system industry. Today we’re going to talk about a very practical topic — how do you know if a current transformer (CT) used in Air Insulated Switchgear (AIS) is truly qualified? This isn’t just about meeting technical specs; it’s directly tied to equipment safety, grid stability, and accurate metering.Let’s dive in — based on my real-world experience.IntroductionIn subs

The selection and installation of current transformers for air-insulated switchgear (AIS CT) directly affect the measurement accuracy, protection reliability, and operational safety of power systems. It is necessary to comprehensively consider equipment characteristics, system requirements, and environmental conditions. The specific precautions are as follows:1. Precautions for Selection1.1 Matching of Electrical Parameters Rated primary current: Determine based on the maximum continuous operati

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’ve worked with many types of current transformers (CTs), especially those used in air insulated switchgear (AIS).Although this type of equipment is relatively simple in structure and easy to maintain, it still experiences frequent issues during actual operation. Today, I’ll share my ha