HVPU-5P High Voltage Proving Unit

HVPU-5P High Voltage Proving Unit

The HVPU-5P is a portable, rechargeable high voltage proving unit used to verify that an HV voltage detector is functioning correctly before, and after, you check a circuit for the absence of voltage. It is the small piece of test equipment that turns “the indicator didn’t light” into something you can actually trust on a substation floor.

For Irish electrical engineers and contractors working at MV and HV, voltage proving is a core part of any safe system of work. Prove the detector before the test, prove it again after, and you have ruled out a silent failure of the instrument while the circuit was being checked.

Why a high voltage proving unit matters

A voltage detector that fails between checks is the worst case in HV work: the detector reads “no voltage”, you move to earth the line, and the line is live. The proving unit removes that risk by giving you a known output to test the detector against, on demand, in the field.

The standard workflow is prove, test, prove:

• Prove the voltage detector against the proving unit (the detector should indicate)
• Test the circuit, where the detector should confirm the absence of voltage
• Prove the detector again to ensure it is still functioning correctly

Without that re-prove step, a failed detector can produce a false negative reading and put personnel at real risk of arc flash and electrocution.

Key features

• Portable, rechargeable unit sized for a switching kit-bag, suitable for substation, switchroom, and site use.
• Designed for HV detectors, including capacitive and resistive type high voltage detectors across common HV voltage ranges.
• Low energy outputs at HV step levels for safe verification of detector operation.
• Visual and audible indication of operation so the operator can confirm the detector is responding.
• One-button operation for fast verification before and after each circuit test.
• Calibration supported through Powerpoint Engineering’s in-house laboratory.

The HVPU-5P is a proving unit, not a power supply and not a multifunction instrument. It is not an insulation tester, not a multimeter, and not a substitute for a voltage detector.

Specifications: what to confirm before you order

Send us your detector make and model and we will confirm fit against the manufacturer datasheet before you order.

Target users and applications

The HVPU-5P is specified by:

• Electrical contractors carrying out MV and HV cable work and substation switching
• Utility authorised persons and substation operators
• Industrial maintenance and EHS personnel responsible for HV isolation
• Commissioning, fault-response, and planned shutdown teams

Typical applications include substation maintenance, MV and HV cable terminations, planned shutdowns, and any task where a high voltage detector is being relied on to confirm the absence of voltage. The HVPU-5P sits alongside, rather than replacing, low voltage proving kit such as two-pole low voltage testers and dedicated LV proving units.

Calibration is supported through our in-house calibration and repair service, and we also support customers working with proving units, voltage detectors, and substation safety equipment across Ireland.

FAQs

What is the difference between a high voltage proving unit and a voltage detector?

The voltage detector is the instrument you use to confirm a circuit is dead. The proving unit is the reference source you use to confirm the detector is functioning correctly. You need both, and you use the proving unit before and after each circuit test.

Will the HVPU-5P work with any HV voltage detector?

It is designed for high voltage detectors across common HV voltage ranges, but compatibility depends on the detector’s rated threshold and connection method. Send us the detector make and model and we will confirm fit against the manufacturer datasheet.

Does the HVPU-5P need calibration?

Yes. Like any reference instrument, the proving unit should be calibrated periodically to remain trusted as part of your safe system of work. Powerpoint Engineering’s calibration laboratory carries out the work in-house and supplies a traceable certificate.

To match the right HVPU-5P configuration to your voltage detectors and site conditions, request a quote or speak to our team for compatibility advice.