Overheating and partial discharge shorten the operating life of equipment and can lead to serious fire and explosion incidents that affect the reliability and safety of the power system. Infrared thermal scanning and partial discharge measurement are indispensable methods in enhancing the monitoring of electrical cabinets and electrical equipment to detect and prevent problems early and help power system operators proactively develop plans to monitor and handle problems occurring in the power system to reduce power outage time and optimize maintenance costs.
1. Infrared thermal scanning:
Infrared thermal scanning will check the heating temperature of operating electrical equipment such as transformers, cables, capacitors, motors, etc. and the connection points between busbars, cables and equipment, to check whether the operating temperature of the equipment exceeds the limit and whether the connection points and contacts are loose or not in good contact, including:
♦ Electrical cabinet system
– Busbar connection point
– Power cable connection point
– Capacitors
– Contactor
– Reactor
– Circuit breaker: ACB, MCCB, MCB
♦ Equipment: Transformer, generator, motor…
– Power cable connection point
– Busbar connection point
– Body temperature
♦ Cable, Busway, transmission and distribution lines
– Connection point
– Busbar connection point
– Cable body temperature
2. Partial discharge measurement:
Partial discharge measurement will perform surface discharge, corona discharge, internal discharge testing for operating electrical equipment such as cables, transformers, motors, circuit breakers, medium and high voltage electrical cabinets, to detect locations or equipment that are being discharged and the level and intensity of discharge, including:
♦ Medium and high voltage electrical cabinet systems
– Connection cables
– Circuit breakers, DS, CT, VT…
♦ Equipment: Transformers, motors…
– Connection cables
– Coils
– Insulators
♦ Cables, transmission and distribution lines
– Connection cables
– Insulators
– Lightning arresters
– CT, VT, FCO, DS.
3. Measuring equipment:
4. Applicable standards:
♦ NETA MTS: Technical guidelines for maintenance testing of electrical equipment and systems.
– Table 100.18: Temperature survey and proposed solutions based on temperature rise.
♦ Technical characteristics of the equipment.
♦ PD measurement according to IEC 60270
♦ PD measurement according to IEC 62478
– High frequency wave measurement with UHF sensor
– Current pulse measurement with HFCT sensor
– Transient voltage pulse measurement with TEV sensor
– Ultrasonic wave measurement with AE sensor