1. Power transformer measurements:

• Measurement of winding insulation resistance;
• Measurement of winding resistance by applying DC voltage;
• Demagnetization of transformer core;
• Measurement of transformation ratio;
• Excitation current measurement;
• Tan delta test;
• Power factor measurement;
• Short-circuit resistance measurement;
• Magnetic balance measurement;
• Measurement of tap changer characteristics;
• SFRA measurement.

2. Measurements of measuring current and voltage transformer:

• Measurement of winding insulation resistance;
• Measurement of winding resistance by applying DC voltage;
• Measurement of magnetization characteristics of the current transformer;
• Measurement of the voltage and current transformation ratio.

3. Commissioning and testing of switchgear equipment up to 330 kV and maintenance:

• Insulation resistance measurement;
• Contact resistance measurement;
• Measurement of tripping characteristics of the circuit breakers;
• Testing at minimum voltage;
• Measurement of overhead line resistance (k-factor);
• Other electrical measurements;
• Commissioning of the substations to the network.

4. Measurement of cable lines:

• Insulation resistance measurement;
• Testing of cable line at elevated test voltage (DC, VLF, AC (cables up to 35 kV));
• Measurement of dissipation factor (Tan Delta);
• Testing of cable sheath (cables up to 230 kV).

5. Testing of relay protection and automation (RPA) equipment:

• RPA secondary circuit adjustment;
• RPA equipment configuration in accordance with the specified settings;
• Comprehensive tests and testing of RPA equipment in accordance with the specified settings.