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service(HIGH Voltage)
9. Measurements and testing commissioning of high-voltage transformers(CT, VT)
Type of test
Measuring ratio transformation of current transformers (CTs)
Measurement of the ratio transformation of the TPs’ BUSHING TCs
Checking of the polarity of the secondary CTs
Measurement of the resistance of the secondary windings CTs
Measurement of the resistance of the secondary circuits CTs
Measurement of the secondary load CTs
Measurement of the magnetization curve of CTs and angled point
Measurement of the ratio transformation of CT Rogowski
Insulation measurement of the CTs
Measurement of the ratio transformation voltage-transformers (VTS )
Check the polarity of the secondary of VTs
Measurement of the resistance of the secondary windings VTs
Measurement of the resistance of the secondary circuits VTs
Measurement of the secondary charge of VTs
Insulation measurement of the VTs
10 . Measurements and testing of the commissioning of power-transformers (PT)
Type of tests
Measurement of the ratio transformation by tap changer
Measurement of the winding resistance
Measurement of the ratio transformation of the TCS bushings
Control of contact fingers by tap changer
Checking of operating of the internal protective
Control of the low-voltage cabinet and functional tests (Control trimmer, Ventilation ...)
Insulation measurement of the PTs
11. Measurement and testing of the commissioning of high-voltage disconnecting switchers
Type of tests
Measurement of the static resistance of the circuit breakers
Measurement of the dynamic contact resistance of the circuit breakers
Current measurement of the tripping and closing coils
Measurement of the opening and closingtime delay of the main circuit-breakers
Checking of the operating of the auxiliary circuit-breakers contacts
Checking of the control panel and testing functionality
Control locks
Measurement of the resistance disconnectors contacts
Checking of the control panel and functional testing of the disconnectors
Disconnectors locking control
12. Measurement and testing of the commissioning of the capacitor batteries of medium-voltage
Type of tests
Measurement of the capacitance of the capacitors elements
Measurement of insulation of the capacitor elements
Checking of the cabinet control and protection, functional testing
Control locks
13. Measurements and implementation of neutral power resistance of the transformers
Type of tests
Measurement of the resistance
Measurements on CT semi-neutral and resisting earth
Control of the current circuits
14. Measurement and implementation of the neutral point coilsof the power transformers
Type of tests
Measurement of the windings resistance
Insulation measurement
Inspection and testing operation of internal protections