Maintenance Service

For high voltages

• After the user’s meter to the transformers of high voltages
  For low voltages

For low voltages

• From the low voltage transformer to the MDB
• Inside the MDB; which consists of the ACB, bus bar, and main circuit breaker of each section

• Conduct general, physical tests
• Check the size of the high voltage fuse
• Test the การปลด and switching of the high voltage equipment

• Test and clean the insulators
• Repair any hotspots known from observations through the infrared camera
• Compose a test report for clients

• Conduct general, physical tests
• Test the pressure of Gas SF6
• Test the opening-closing of the circuit and all moving mechanisms
• Test the resistance of the surface

• Test the resistance of the insulators
• Test the ground value
• Test the functions of main distribution board

• Conduct general, physical tests
• Test the opening-closing of the circuit and all moving mechanisms
• Test the resistance of the surface

• Test the resistance of the insulators
• Test the ground value
• Clean the inner and outer areas

• Conduct general, physical tests
• Test the opening-closing of the circuit and all moving mechanisms
• Test the resistance of the surface

• Test the resistance of the insulators
• Test the ground value
• Clean the inner and outer areas

• Conduct general, physical tests
• Repair any hotspots known from observations through the infrared camera
• Test the electrical connection points by using torque wrenches at those points
• Test the opening-closing of the circuit and all moving mechanisms
• Test the resistance of the surface

• Test the resistance of the insulators
• Test the ground value
• Check the test equipment and system’s functions
• Clean the inner and outer areas

• Conduct general, physical tests
• Test the mechanism set’s functions
• Test and measure the ACB’s contact resistance

• Test the Trip Unit’s functions

– Long-Time delay pick up current
– Short-Time delay pick up current
– Instantaneous delay pick up current
– Ground fault pick up current

• Test the ATS Control
• Test the operations of the Mechanical Interlock & Electrical Interlock of the Transfer set
• Test the electrical connection points by using torque wrenches at those points
• Test and adjust the values to be suitable with the usage and purposes
• Test the resistance of the surface
• Test the resistance of the insulators

• Test the ground value
• Test the operations of the measurement equipment and systems
• Clean the inner and outer areas
• Conduct general, physical tests
• Repair any hotspots known from observing through the infrared camera

• Conduct general, physical tests
• Repair any hotspots known from observing through the infrared camera
• Test the electrical connection points by using torque wrenches at those points
• Test the operations of the Power Factor Controller
• Adjust and set the Power Factor to comply with the standard electrical criteria

• Test the HRC Fuse Link
• Check and test the operations of the Magnetic Contactor
• Check and measure the capacitance value of the Capacitor
• Test the ground value
• Clean all the inner and outer areas

• Measure the load
• Test the ground value ค่ากราวน์ at the transformer
• Check / change the absorbent
• Test the insulation class of the oil
• Test the insulation class of the coils
• Check the gaskets

• Check the transformer’s oil level
• Check the cleanliness of the bushing
• Check the transformer’s tap position
• Check the surge arrester and the high voltage fuse
• Check the Drop Out Fuse Cutout

• Measure the load
• Test the ground value ค่ากราวน์ at the transformer
• Test the insulation class of the coils
• Test the LV and HV connection points
• Test the tap connection points

• Clean the entire device
• Check the transformer’s tap position
• Check the fan’s operations
• Test the temperature alarm’s function

• Test the ground value in the user’s system at no more than 5 points