Catalog excerpts
NDB-DOC Distribution transformer tester The NDB-DOC is a test instrument designed for distribution networks transformers from 10kVA to 2500kVA. It can determine the presence of short circuits or an open circuit in the distribution transformer primary winding & also short circuits on the secondary winding. The NDB-DOC is designed to be operated from an arial device or from the ground at the end of a hot stick without disconnecting the transformer’s secondary windings. No need for disconnecting transformer secondary windings therefore saving time Reduces risks of hazards when putting fuses back online when the transformer windings are shorted Conformity with the requirements for safety (IEC-TC78 ) Rugged Delrin® made casing, drop-safe For transformers up to 833kVA single phase or 2500kVA three phase (Pole mount or Pad mount) Measurement by contact on the transformer primary bushing and Neutral/Ground Used on de-energized transformer Detects primary transformer short-circuit, open circuit, & secondary short circuits Visual and audible warning Automatic self-test & Auto shut-off Low battery indicator EASY OPERATION The instrument requires an electrical connection to the primary bushing and the system ground (neutral). The NDB-DOC displays the diagnostic readings with a visual and audible signal. The NDB-DOC kit includes the test instrument, contact electrodes ( Pole mount hook & Pad mount pin ) and a transportation bag. NDB-DOC Instrument ndb Technologies inc. • 1405 St-Jean-Baptiste, office 111 • Quebec (QC) G2E 5K2 - Canada • Tel: 1(418)877-7701 Fax: 1(418)877-7787 Email: mkt@ndbtech.com
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TECHNICAL SPECIFICATIONS Supported transformers Distribution single phase kVA range selection: • 10 to 20 kVA • 25 to 167 kVA • 167 to 2500 kVA Hook type probe and pin type probe Operating temperature Power supply OPERATION Linemen crews are called on to re-energize transformers regularly, whether it’s after storms or when line faults occurs etc... The reasons for the outages are not always obvious, but the power needs to get back on. When damaged or connected to a faulty circuit, the transformers can rupture with massive amount of energy when attempting to re-energize. In order to make a...
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