Electrical System
Testing and Commissioning

Good care and life management of cables can greatly improve a utility’s reliability indices. Cable testing features prominently in this process and can be split into the following categories: Cable testing to verify and prove the serviceability of the cable. Cable diagnostics to assess a cable’s integrity / health and thereby predict its long-term viability. Fault location to locate the faulted section of the cable efficiently and speedily

Cable testing and diagnostics:

  • Cable testing and diagnostics provides information about the cable’s global condition (e.g. the cable’s overall insulation system), and will reveal localized problems, such as poor joints and terminations; it will also reveal localized weak spots in the insulation. Various cable tests are carried out to spot potential failures before they can cause severe outages. TEMCO cable test equipment provides access to all the technology needed to make informed cable management decisions through the different stages of the cable’s life cycle.
  • Newly laid cables may be tested to reveal any faults arising from transportation or installation
  • During the life of power cables, older PE/XLPE insulation cables may require testing to assess aging, particularly water-tree growth, which causes sections of the cable to weaken.

VLF testing uses very low frequencies as part of an AC cable maintenance routine. VLF testers are smaller and more practical than AC testers but output the same amount of power as a 50 Hz mains device. This combination of size and power makes Very Low Frequency cable testing perfect for testing longer sections of cable and apparatus.

AC is the standard used to transmit power worldwide, usually at a frequency of 50 or 60 Hertz. While supplies to railways and aircraft may use 162/3 of 400Hz, it is still a sinusoidal voltage waveform. A VLF test is ideal for working within these parameters.

Transmitting power with an alternating current is not as efficient as with a direct current however: while all power transmission lines and cable networks do have the side effect of DC resistance loss to the supply voltage, the level of capacitive loss is even higher. This is largely due to the inherent coupling between the phases involved. As a result, generating systems must supply enough energy to meet user demand as well as compensate for the large losses stemming from the transmission process. The small size and high power of the VLF tester helps to solve the practical problem of transmission loss during an AC test on very long sections of cable and apparatus in the field.

This equipment negates the need for on-site generation, large step-down transformers or generating company supplies to be employed to power the items under test.

Because VLF testing supplies a working frequency of 0.1Hz as opposed to the 50/60Hz usually required for live transmission, the physical size of the VLF test set is massively reduced. Critically, the test object still receives the Alternating Sinusoidal Voltage that would be supplied through everyday use, but the size of the test equipment is much smaller.

Transformer-Maintenance
Transformer-Maintenance
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We are specialize in Testing and Commissioning and providing fully professional and high-end quality services at your door step.