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