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  MORE than a supplier     HV Power Customer Newsletter August 2020    
        The signs are all up    

    In this issue:

Photo - Warwick Beech


Software updates

Thanks to our customers who supported us during and after lockdown. With the projects that have been forecast we have the confidence to take on a new staff member. Dipak Hirani has joined us in on the workshop floor as an Electrical Fitter, assisting with the wiring and customisation of our switchgear.

While the business signs looks good in the medium to long term, the short term is still a challenge. In New Zealand we are fortunate to have the COVID-19 status envied by many, but we are still experiencing unpredictable delays and escalating air-freight costs in getting goods from the rest of the world. In some cases, we are considering swapping the shipment of small goods to consolidated sea freight. While this has a longer delivery, it is lower cost and more reliable! We are also seeing price increases being passed on more quickly, but a slower technical response from our overseas suppliers as they grapple with their situation. 

Recommendation: Do not put off purchases, plan further ahead and put flexibility in your plan.


Warwick Beech



Here is what our growing business looks like.

HV Power's Auckland office 
New Protection Relay, Reyrolle 7SR10

Our first 7SR10 has now arrived and is being put through its paces. This is a surprising low-cost ($1400-$1900) yet effective relay for simple feeder protection applications. The 7SR10 consists of overcurrent and earth fault protection functions with a directional version adding voltage, frequency, and power protection functions. Highlights include:

  • Simple setup via front-panel USB, using free setting software (Reydisp) – it’s very easy software to use!
  • 1/5 A universal CT inputs
  • 9 tri-coloured LEDs, with LCD display
  • Up to 9 binary inputs (maximum of 6 for non-directional version)
  • Conformal-coated PCB in a non-withdrawable case
  • RS-485 DNP and MODBUS serial protocols (standard with directional relay,  optional for the other)
  • 24-48 Vdc and 110 Vdc/230 Vac power supply options

Siemens Reyrolle 7SR10 Overcurrent Protection Relay
Siemens Reyrolle 7SR10 Overcurrent Protection Relay

See the Siemens website for more information, or give us a call if you would like to see this relay first-hand.


      PQ-Box 50 - the tiny-sized analyser    

We now have our first PQ-Box 50 Power Quality Analyser and are very impressed after putting it through its paces over lockdown. The PQ-Box 50 replaces the PQ-Box 100 (which is now over 10 years old in design). The PQ-Box 50 offers similar measurements to the PQ-Box 100 but it is more compact. It does not have a local display - rather you use WinPQ mobil software via USB/Wi-Fi, or via Wi-Fi and a new smart phone app! [Android and IOS supported]. The App allows for basic setup and monitoring measurements of the PQ-Box 50.

Download PQ-Box 50 datasheet

PQ-Box 50 Power Quality Analyzer PQ-Box 50 Power Quality Analyzer App
PQ-Box 50 and App.

Contact us now to find out more about the very popular PQ-Box series covering all your PQ needs.


Services Section DIGSI 5 Quick Notes – Linking the SCD file
SIP5 7VE85 paralleling device

We have added further ‘DIGSI 5 Quick Notes’ to our Protection Relay Technical Library to help our growing user base of SIPROTEC 5 customers. The latest covers the situation where a Project file and SCD file have been supplied to a technician for loading into a relay, and how to set up the DIGSI 5 Project to allow that. Other recent Quick Notes include:


  Accommodating cable bending radius

When installing or replacing a Ring Main or Switchgear, sometimes the cable trench is not deep enough to accommodate the cable bending radius. In some cases, there are no cable trenches at all, and the cables are installed on the floor. However, it is a requirement for most Siemens switchgear that when cables enter the cable termination area, they are essentially vertical. If that is not possible due to minimum cable bend radius, one solution is to raise the RMU.

Raise the RMU to provide straight entry of cables
Raise the RMU to provide straight entry of cables

HV Power provide a set of modules that can be bolted under the RMU base to raise it from the floor. The heights that are currently available are 150 mm, 200 mm, and 300 mm. These can be bolted together in any combination to gain the overall required height. The modules are available for the standard switchgear panel widths of 310 mm, 430 mm, 500 mm, and 840 mm.

Base extension module examples
Base extension module examples

The modules have removable end plates to aid installation around existing cables, or for where cables are to be laid-up later from the front.


  Simulating values to SCADA with REG-D/DA voltage regulators with PE/PED cards

WinConfig offers useful functions for quickly testing SCADA points, such as to confirm points are mapped correctly to SCADA and that the scaling is correct. To do this, follow the steps below.

  1. Connect to the SCADA card using a Web browser by entering the IP address of the card (e.g.
  2. Enter the appropriate username and password
  3. Go to the WinConfig device/indication page
    1. Tick ‘Enable Simulation’
    2. For the desired points set the ‘Simulation’ parameter = Yes
    3. Enter the ‘Simulation value’ you want to simulate
    4. Select ‘Start simulation’, and the simulated point(s) will be generated to SCADA
    5. ‘Stop simulation’ when done


The use of simulation is a convenient method to quickly test SCADA points without the need for primary or secondary injection. However, it should not be the sole method used during relay-SCADA commissioning.


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