Putting plants and components into operation in the high and medium voltage network requires a large degree of expertise and experience – particularly as regards dynamic network processes. A good commissioning engineer is characterized by his profound knowledge about the power flow and short circuit behaviour of the various networks, the response times of network components and by his experience and competence when it comes to the analysis of faulty processes. By sending their own commissioning engineers VESCON is sure to provide this essential know-how.
Before the newly constructed or upgraded plants are put into operation, however, they have to undergo numerous checks. The primary test device CPC 100 and the secondary test system CMC 356 by Omicron which we use for this purpose are state-of-the-art and multifunctional test instruments.
Types of Testing
Protective Devices Tests:
- Testing of protective devices of all makes and all generations (from conventional electromechanical relays to complex digital protective relays) with the help of the test system CMC 356
Current Transformer Tests:
- Check of transformation ratio and apparent ohmic resistance (up to 2.000A primary current by external current amplifiers), polarity measurement, recording, magnetisation curve etc.
Voltage Converter Checks:
- Testing of transformation ration and apparent ohmic resistance, polarity measurement
Power Transformer Tests:
- Transformation per step, resistances, transformer winding, step switch circuit, capacity and dissipation factor measurement in connection with coupling unit CP TD1
- Resistors like contacts, windings
- In connection with coupling unit CP TD1: insulation check (dissipation factor tan delta) of high voltage system components such as power transformers, measuring transformers, power switches, condensers etc.
Impedance and Earthing Measurements:
- In connection with coupling unit CP CU1: precise frequency selective impedance measurement of maximum voltage lines including zero sequence impedance for the correct setting of distance and fault location systems
- Testing of large earthing systems of high and maximum voltage switchboards