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 selection devices in 110 kV and 220 kV substations, their accuracy remains low, requiring monitoring/operation staff to analyze remote measurements. For ungrounded systems with three - phase 4PT voltage

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 protection in power systems. Their proper selection and installation directly affect the safety and stability of the entire electrical grid. With the advancement of smart grid technology, electronic AIS vo

Hey everyone! I’m Echo, and today we’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 technology advances, they continue to evolve to meet higher performance demands and stricter environmental standards. Let’s take a closer look!ApplicationsVoltage MeasurementOne of the primary task

Hey everyone! I’m Oliver, an experienced electrician with over a decade in the power system industry. Today, we’re diving into a practical topic — what tests are required to ensure an Air Insulated Switchgear (AIS) voltage transformer is qualified? These tests are crucial not only for ensuring the device operates correctly but also for maintaining the safety and stability of the power grid. Let’s get started!1. Visual InspectionFirst Look MattersThe very first step is a v

Hey everyone! I’m Felix, a 10-year veteran in the power system industry. Today, we’re going to dive into an important topic — 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’s get started!1. Insulation DamageThe Problem You Might Encounter：One of the most frequent issues is insulation damage. This typically happens due to aging insulation materials, overvoltage surges,

Hey everyone, I’m James, and I’ve been working with outdoor voltage transformers (VTs) for 10 years.From the early days of tagging along with my mentor on job sites, wiring up equipment, and debugging systems, to now leading substation projects and dealing with all kinds of complex field issues — I’ve seen it all. I’ve made mistakes, learned from them, and picked up some real-world experience along the way.Not long ago, a colleague messaged me:“Echo, we’

Hey everyone, I’m Echo, a 10-year veteran in the field of outdoor voltage transformers (VTs). Today, let’s talk about where the 35kV outdoor voltage transformer is heading in the future.1. Digitalization and Smart FeaturesWith the rise of IoT (Internet of Things), big data, and cloud computing, 35kV outdoor VTs are getting smarter.Imagine a voltage transformer that can monitor its own condition in real time, send data remotely, and even be controlled from your phone or computer. This

Hey everyone, I’m Echo, and I’ve been working with voltage transformers (VTs) for 12 years.From tagging along with my mentor doing insulation tests to now leading teams handling all kinds of high-voltage equipment issues — I’ve done a lot of oil refilling in my time. Especially when it comes to 110 kV voltage transformers, oil refill is a key part of daily maintenance. But let’s be honest — it's also one of the biggest time-wasters.A few days ago, a colleague

1. IntroductionOutdoor voltage transformers are key equipment for ensuring the safety of electrical apparatus. Scientific and comprehensive test analysis is required to avoid hazards and property losses caused by improper operation. Test analysis can guide the formulation of operation strategies and precautions, ensure the stable operation of equipment, and maximize economic and social benefits.2. Concept of Outdoor Voltage TransformersAn outdoor voltage transformer is essentially an outdoor ste

1. IntroductionFrequent 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 combined transformer, investigates the fault causes, proposes solutions, and recovers the incorrect electricity quantity through correction coefficients. This effectively reduces grid losses and mitigates ser