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1TPRV
Single-Phase Test Point Mounted Standard Remote Display
| Overview |
Use SEL test point voltage reset fault indicators with remote displays (1TPRV) on 200 and 600 A class underground distribution systems whose terminators have test points. The 1TPRV requires a 5 kV phase-to-ground minimum voltage to reset and remain ready to trip. Its remote target automatically resets when system voltage returns to normal. With just three holes in the transformer cabinet wall, this display indicates from the outside of the cabinet, eliminating the need to open the cabinet door to check its status. The sensor’s conductive, easy-to-install EPDM rubber housing maintains the separable connector system’s ground shielding. The 1TPRV operates independently of load current. The 1TPRV’s inrush restraint feature blocks tripping that might result from reclosing operations. When the breaker or recloser opens, the 1TPRV senses a loss of voltage on the test point. The indicator then blocks the display from targeting if the subsequent inrush current exceeds the trip value. It is ready to trip a few minutes after re-energization.
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| Applications |
Install 1TPRV fault indicators in padmount transformers, subsurface load centers, or junction sectionalizing points. In single-phase underground loop applications, install the 1TPRV at the transformer. At sectionalizing junctions, place an indicator on each outgoing feed, just below the elbow pulling eye.
SEL also offers the 1TPRV with an auxiliary contact feature. This model has the same compact, easy-to-use and apply package as the standard unit, but allows the utility to connect the fault indicator to a SCADA system. The latching contact closes when a fault occurs and remains closed until normal system voltage is restored for three to five minutes.
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| Installation |
Use 1TPRV fault indicators at single-phase and padmount transformers, subsurface load centers, or junction sectionalizing points. To install the 1TPRV, simply remove the test point’s protective cap and replace it with the indicator. The 1TPRV comes with an adapter that allows the lineman to quickly modify the fault indicator to fit the major manufacturers’ various test point designs. Because of its mounting position on the terminator, concentric neutral training is not a consideration. The cable entrance portion of 600 A T-body connectors with test points is another ideal location for 1TPRV fault indicators. At junction sectionalizing points, the indicator’s junction shield prevents false tripping that might otherwise occur because of adjacent phases.
Removing the 1TPRV to access the test point for system testing is as simple a process as removing the 1TPRV, performing the test, and reinstalling the indicator.
1TPRV fault indicators come with internal adapter rings that accommodate most manufacturers’ elbow test points.
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Fault Indicators