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

Role and Selection of Microcomputer Integrated Protection Devices in High-Voltage SwitchgearIn recent years, the application of microcomputer integrated protection devices in medium- and high-voltage power distribution system projects has increased significantly. These devices are user-friendly and overcome the drawbacks of traditional relay protection, such as complex wiring, low reliability, and cumbersome setting and debugging procedures. Microcomputer integrated protection devices feature co

What is a microcomputer protection device?Answer: A microcomputer protection device is an automatic device that can detect faults or abnormal operating conditions in electrical equipment within a power system, and act to trip circuit breakers or issue alarm signals.What are the basic functions of microcomputer protection?Answer: Automatically, rapidly, and selectively isolate faulty equipment from the system by tripping circuit breakers, ensuring non-faulty equipment resumes normal operation qui

Retrofitting microcomputer protection devices in substations should follow specific steps and precautions. A possible retrofit plan is as follows: Investigate the current status: Understand the types, specifications, operating conditions, and existing issues of the microcomputer protection devices in the substation to provide a basis for the retrofit. Develop a retrofit plan: Based on the investigation and requirements, create a detailed plan including specific tasks, technical specifications, i

1. Selection of Test InstrumentsThe main test instruments for microcomputer protection devices are: microcomputer relay protection tester, three-phase current generator, and multimeter. For testing high-voltage microcomputer protection devices, it is recommended to use a microcomputer relay protection tester capable of simultaneously outputting three-phase voltage and three-phase current, and equipped with timing function for digital inputs. For testing low-voltage microcomputer protection devic

I. BackgroundWith the advancement of intelligent power systems, microcomputer protection devices have become core components in modern industrial power distribution systems due to their high precision, multifunctionality, and reliability. Taking the power distribution project of a natural gas recovery station in the Middle East as a case study, this paper explores the critical role of AM series microcomputer protection devices in enhancing system safety, reliability, and automation levels, and a

1.Selection and Role of Microcomputer Integrated Protection Devices1.1 Selection of Microcomputer Integrated Protection DevicesTo ensure a microcomputer integrated protection device correctly and accurately performs its relay protection tasks, selection during design should comprehensively consider reliability, response time, maintenance and commissioning, and additional functions.Signal input for microcomputer integrated protection devices is the same as traditional relay protection: voltage an

High-Voltage Switchgear Room When the length of a high-voltage switchgear room exceeds 7m, two doors should be provided, preferably located at opposite ends. The access door for handling GG-1A type switchgear should be 1.5m wide and 2.5–2.8m high. Recommended dimensions for operating aisles in front of fixed switchgear: 2m for single-row layout and 2.5m for double-row layout, measured from the front of the panels. When a large number of switchgear units are installed, the aisle width may be appr

What is a Switchgear Room?A switchgear room is an indoor electrical distribution facility that supplies power to low-voltage consumers. It typically includes medium-voltage incoming lines (with limited outgoing lines), distribution transformers, and low-voltage switchgear. Facilities operating at 10kV or below are categorized as either high-voltage or low-voltage switchgear rooms. A high-voltage switchgear room generally refers to a 6kV–10kV high-voltage switch compartment, while a low-voltage s

Maintenance of Main and Control Circuits in Low-Voltage Switchgear (Dust Removal); Inspection and Maintenance of Isolators, Circuit Breakers, Contactors, and RelaysI. Preparation and Standards Before Maintenance Pre-Maintenance Preparations: (1) Working Conditions: Scheduled shutdown and power disconnection. (2) Tools and Instruments:Measuring instruments and tools including: insulation resistance tester (megger), clamp meter, multimeter, combination wrenches, voltage tester, electrician pliers,

High- and Low-Voltage Cable Lines and Cable Trays Inspect cable trays for proper closure and secure rodent-proof sealing. High- and low-voltage cable trays should be intact and undamaged. Address any abnormalities promptly and maintain records. Check for water seepage in cable trays entering switchrooms located in basements or low-lying areas. Inspect cable pits and trenches for standing water or debris, and promptly drain water and remove contaminants if found. Cables and cable terminations wit