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- Power transformers and shunt reactors prophylaxis
- Switchgear apparatus prophylaxis (circuit breakers)
- Instrument transformers prophylaxis
- Surge arresters prophylaxis
- Switchgear apparatus prophylaxis (medium voltage prefabricated substations)
- Switchgear apparatus prophylaxis (disconnectors)
- Power system grounding analysis
- Infrared thermography
- System for mechanical condition assessment of power transformers using frequency response analysis – ARF method –
- System for mechanical condition assessment of power transformers using low voltage impulse method – IJT method –
- Renewable energy sources
Switchgear apparatus prophylaxis (circuit breakers)
Specialized engineering services for circuit breakers in operation
S.C. NOVA INDUSTRIAL S.A. experts evaluate the technical state of the switchgear apparatus in service based on the analyze of the history data (concerning construction, factory tests, tests for putting into service or for preventive maintenance, incidents in operation), in addition to tests and measurements specific to each type of switchgear.
Tests and measurements specific to CIRCUIT BREAKERS:
- measurement of the insulation resistance of the mobile and fixed pieces and subassemblies, made of organic or inorganic insulating materials, parts of the high voltage primary circuit;
- measurement of the insulation resistance of the low voltage secondary and/or auxiliary circuits;
- measurement of the leakage current on the insulating columns of the circuit breakers ( IO 123-245-400 kV type circuit breakers);
- insulation test made at the power frequency voltage of the primary current path, with the circuit breaker closed, respectively opened;
- insulation test of the secondary and/or auxiliary paths of current, made at power frequency or direct voltage;
- measurement of the dynamic resistance of the main current path for nominal operating cycles and/or rapidly closing/opening cycles;
- measurement of the extraction forces of the moving knife-contacts from the fixed contacts of the withdrawable equipment;
- measurement of the ohmic resistance of the resistors and of the capacitance of the shunting condensers from the circuit-breakers interrupting chamber;
- measurement of the ohmic resistance of the coils, of the electromagnetic valves or of the opening / closing electro valves;
- measurement of the operating / reaction time, respectively of the touching and breaking non-simultaneity of the contacts for different fazes or for the same faze (for series of more contacts);
- measurement of the moving contact acceleration;
- verification of the built-in current transformers;
- tests of the oil taken from the breaking chamber, insulating columns and tank;
- verificari functionale ale intreruptoarelor la anclansari si declansari;
- measurement of the rate of displacement of the moving contacts, of the total course and of the course in the fixed contact;
- verification of the tightness (for the circuit-breakers using SF6);
- verification of the signalization of the pressure decrease under the minimum admissible level and of the action of the pressure connector in this case (interlocks, electrical controls, signalization;
- determination of the SF6 gas dew point;
- verification of the seismic behavior of the circuit beakers;
- measurement of the vibration during the circuit breakers operation;
- measurement of the static and dynamic pressures.
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