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

High-Voltage Conductor SpikesDuring the installation of high-voltage conductors, accidental bumps or scratches can cause metallic spikes on the conductor surface, as shown in Figure 1. Under power-frequency voltage, the ionization effect of high electric fields at the spike tips generates charged particles, which may suppress partial discharge (PD) or breakdown. However, under impulse voltage, the ionization process induced by the strong electric field does not have sufficient time to develop, m

Gas - insulated metal - enclosed switchgear (GIS) is a switching device composed of switching appliances such as circuit breakers (GCB), disconnectors (DS), earthing switches (ES), as well as units like voltage transformers, current transformers, surge arresters, and enclosed busbars. High - potential components are all placed inside a grounded enclosed metal shell, which is filled with SF₆ gas with excellent insulating and arc - extinguishing properties as the insulating medium. GIS features a

Analysis of GIS Equipment Installation ProcessPre - installation Preparations for GIS EquipmentFirst, use a crane to lift the equipment to the entrance. Then, insert a crowbar into the groove of the channel steel to move the equipment along the channel steel into the room. It can be received by a roller or a forklift for transfer. Before the equipment installation after the transfer is completed, sufficient preliminary preparations are required. Firstly, the equipment needs to be comprehensively

Importance of Long - distance Loop Resistance Testing for GISInspecting the Installation Quality of Electrical Equipment and the Integrity of the LoopIn the handover tests of GIS, loop resistance testing plays a crucial role. This test is not only a key step in evaluating the installation quality of electrical equipment but also an important means to ensure the integrity and safety of the entire loop. Through precise testing and analysis, potential problems can be promptly identified and resolve

The 500 kV GIS system of Lianghekou Hydropower Station is composed of circuit breakers, disconnectors, earthing switches, bus - pipes, current transformers (CTs), potential transformers (PTs), arresters, etc. It has a total of 12 circuit - breaker bays, adopting an indoor structure and a "Z" - shaped layout, with 6 incoming lines and 2 outgoing lines, and using 4/3 and 3/2 wiring schemes. To meet the access of the Kela Photovoltaic project in the first - phase hydro - photovoltaic complementary

CIS (Gas Insulated Switchgear) refers to a gas - insulated enclosed switchgear assembly. A busbar is a common pathway to which multiple devices are connected in parallel. In a CIS, the internal space of the busbar is relatively small, yet it operates under high voltage and current. Local discharge, if it occurs, can severely affect the inter - phase insulation and pose a significant threat to the safe and stable operation of the equipment. This article presents an analysis and solution of a loca

Overview of the SituationDuring the AC commissioning period of a certain substation, a flashover discharge fault of the post insulator occurred. The specific fault situation is as follows:When closing the 500 kV AC switchyard switch to charge the busbar, the dual - set busbar differential protection of the busbar operated, and the switch tripped. The fault phase was phase B, and the fault current was 5,760 A. The gas composition analysis of the SF₆ gas in the gas chamber was carried out, and the

Selection and Setup of Distribution Equipment Based on GISCurrently, commonly - used distribution equipment mainly includes outdoor open - type air - insulated switchgear, traditional indoor GIS, steel - structured indoor GIS, and outdoor hybrid GIS. This study aims at the substations in Indonesia to complete the setup of distribution equipment for intelligent prefabricated substations. Most of the substations in Indonesia are located in areas with complex terrains and low load densities. Accord

Gas Insulated Switchgear (GIS) consists of circuit breakers, disconnectors, earthing switches, current transformers, voltage transformers, surge arresters, busbars, connectors, and outlet terminals. With higher reliability, safety, and relatively small space occupation, it is widely used in the design and construction of high - voltage substations. In urban and densely - populated areas, GIS is the preferred choice due to its compact structure and excellent insulation performance.However, 110 kV