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

1.Electric Shock Risk Prevention and ControlAccording to typical design standards for distribution network upgrades, the distance between the transformer’s drop-out fuse and the high-voltage terminal is 1.5 meters. If a crane is used for replacement, it is often impossible to maintain the required minimum safety clearance of 2 meters between the crane boom, lifting gear, slings, wire ropes, and the 10 kV live parts, posing a severe risk of electric shock.Control Measures:Measure 1:De-energize th

1. General Requirements for Pole-Mounted Transformer Platforms Location Selection:Pole-mounted transformers should be installed near the load center to minimize power losses and voltage drop in low-voltage distribution lines. Typically, they are placed close to facilities with high electricity demand, while ensuring that the voltage drop at the farthest connected equipment remains within allowable limits. The installation site should allow easy access for maintenance and avoid complex pole struc

Rockwill Electric Co., Ltd. has successfully passed the real-scenario single-phase-to-ground fault test conducted by the Wenzhou of China Electric Power Research Institute for its DA-F200-302 hood-type feeder terminal and integrated primary-secondary pole-mounted circuit breakers—ZW20-12/T630-20 and ZW68-12/T630-20—receiving an official qualified test report. This achievement marks Rockwill Electric as a leader in single-phase ground fault detection technology within distribution networks.The DA

Common Faults and Causes in Routine Inspection of Distribution TransformersAs the terminal component of power transmission and distribution systems, distribution transformers play a critical role in supplying reliable electricity to end users. However, many users have limited knowledge of power equipment, and routine maintenance is often carried out without professional support. If any of the following conditions are observed during transformer operation, immediate action should be taken: Excess

The Battambang Conch PV + Energy Storage Power Station in Cambodia has successfully completed its grid-connected trial operation. The project utilized medium-voltage switchgear supplied by Rockwill Intelligent Electric Co., Ltd. Despite numerous challenges—including an extremely tight delivery schedule—Rockwill Intelligent delivered high-quality products and exceptional service throughout project execution, earning consistent praise from the client.Located in Battambang, Cambodia, the Battambang

Analysis of Lightning Protection Measures for Distribution TransformersTo prevent lightning surge intrusion and ensure the safe operation of distribution transformers, this paper presents applicable lightning protection measures that can effectively enhance their lightning withstand capability.1. Lightning Protection Measures for Distribution Transformers1.1 Install surge arresters on the high-voltage (HV) side of the distribution transformer.According to SDJ7–79 Technical Code for Overvol

Lightning Protection for Distribution Transformers: Arrester Installation Position AnalysisIn China's economic development, the power system holds an extremely important position. Transformers, as devices utilizing electromagnetic induction to convert AC voltage and current, represent a crucial component of the power system. Lightning damage to distribution transformers is quite common, particularly significant in humid tropical areas with frequent lightning activity. A research team has propose

The primary wiring of transformers shall comply with the following regulations: Supports and Cable Protection Conduits: The construction of supports and cable protection conduits for transformer incoming and outgoing lines shall conform to design document requirements. Supports must be firmly installed with elevation and horizontal deviations within ±5mm. Both supports and protection conduits shall have reliable grounding connections. Rectangular Busbar Bending: When rectangular busbars are used

Case OneOn August 1, 2016, a 50kVA distribution transformer at a power supply station suddenly sprayed oil during operation, followed by burning and destruction of the high-voltage fuse. Insulation testing revealed zero megohms from the low-voltage side to ground. Core inspection determined that damage to the low-voltage winding insulation had caused a short circuit. Analysis identified several primary causes for this transformer failure:Overloading: Load management has historically been a weak

Transformer Commissioning Tests Procedures1. Non-Porcelain Bushing Tests1.1 Insulation ResistanceSuspend the bushing vertically using a crane or support frame. Measure the insulation resistance between the terminal and the tap/flange using a 2500V insulation resistance meter. The measured values should not deviate significantly from factory values under similar environmental conditions. For capacitor-type bushings rated 66kV and above with voltage sampling small bushings, measure the insulation