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  MORE than a supplier     HV Power Customer Newsletter October 2020    
        Siemens RMU trapped key interlock    

    In this issue:

Photo - Mike Strong


It is great to see the country being Covid-19-free and getting back on its feet with activities along with new innovations. We are finding this an exciting period with the feeling we are waking from a long slumber invigorated and raring to go. The end of the year is fast approaching so expect to see one of our team members at most of your offices for a Post-lockdown Update, where the aim is to provide information on new and updated products and solutions. We are looking forward to meeting you face-to-face.

For anyone in Auckland, or visiting Auckland, our facility is again open to visitors. So we extend an invitation to call into see our office and projects on the workshop floor. Customers always report this as being an educational experience.


Mike Strong


Photo - Warwick Beech


Mike has set the 2021 agenda – a full programme throughout the year.

Feb: Reyrolle 5 and 7SR series workshops
April: Line equipment road tour
June: EEA
Aug: RUGGEDCOM and IT/OT workshops
Oct: Switchgear road tour

Please keep an eye out for further details as we work through our programme. Our plan is around education on the products and how they should be configured and used. We are also looking to provide a few customer product-specific training course late this year and early next year, so please let us know if there is a particular topic you would like some training or refresher training on.


Warwick Beech



Recently we supplied an 8DJH with key interlock system. The customer will be using this to allow access to a ripple plant equipment enclosure only when the earth switch connecting power to the plant is in the closed position. The arrangement is that the key can only be removed from the 8DJH earth switch when earth switch is closed, and the earth switch can only be opened when the key is returned. The enclosure will have a matching mechanism that only allows the gate to be opened when the key is used. This mechanical solution is simple to understand and hard to bypass, therefore should be highly effective in reducing the risk of live equipment being accessible.

Siemens 8DJH trapped key
Example of trapped key interlock for earth switch.

There are options for key trapped or key released in a given position for the different switching devices in the Siemens range, including feeders and bus couplers.


      New options for PQI-DA smart    

Version 3 of the PQI-DA smart has been released, with a new colour scheme to help identify the product. The new version has improved electromagnetic compatibility and IEC 62586 H compliance for use in harsh environments. The front panel USB connector has changed from Mini-B to Type C. There are also new order options.

New current input options:

  • C40 (4 x Rogowski Coil inputs, 330 mV)
  • C44 (4 x current clamp inputs, 0.5 Vac)
  • C45 (4 x DC current clamp inputs, 5.6 Vdc)

New options for binary input threshold:

  • M1: AC/DC 48 to 250 V (H>35 V, L<20 V, 100 kohm input). [M1 was the default specification prior to V3]
  • M2: DC 10 to 48 V (H>10 V, L<50 V, 6.8 kohm  input)

New options for measuring input voltage range:

  • E1: 100 V, 2 Mohm  (Full-scale range 120 Vac L-E)
  • E2: 100…690 V, 10 Mohm (Full-scale range 480 Vac L-E). [E2 was the default specification prior to V3]

Download the new technical data sheet.


      The PQI-DE Power Quality Analyser for Ring Mains    

The PQI-DE is based on the above PQI-DA smart but also has an input option with 3.2 V voltage measurement range. This is for the connection to low-voltage sensors, eliminating the need to fit ‘traditional’ 63.5 V VTs. This makes PQ measurement in a 11/22/33kV ring main a possibility at a reasonable price.

PQ monitoring for 11kV and 22kV ring mains

The PQI-DE also has a temperature input – ideal if you want to monitor transformer temperature in a shared kiosk. The 8 digital inputs give an opportunity to trigger the fault recorder from an event such as fuse striker pin operation or to record the feeder switch status, allowing correlation of power quality data to a specific network arrangement etc. 

Download the new technical data sheet.


      Siemens SIPROTEC 5, DIGSI 5 version 8.30    

Approximately every six months an upgraded version of DIGSI 5 and firmware for SIPROTEC 5 is released. DIGSI 5 version 8.30 has several new features including:

  • Improved filtering of routing information – select binary inputs, function key, or LEDs, both routed and not routed
  • A page of favourite settings can be created, allowing you to group settings in your preferred manner
  • Single line diagram and device display pages available via web browser
  • Measuring points can be ‘disconnected’ via binary inputs, to allow (for example) current inputs to be ‘disconnected’ during maintenance work
  • Virtual network segregation (VLAN) to reduce traffic and improve security
  • New measurement synchronisation methods including optical pulse per second
  • IEEE 802.1X Authenticated Network Access where network switches require authentication from the IED prior to granting connectivity.

Download the presentation on new 8.30 features.


Services Section SIPROTEC 4/DIGSI 4 Web monitor

Web monitor was a useful tool used by some during commissioning to monitor what was going on with SIPROTEC 4 relays. While using a web page to display, the tool used some Windows ‘trickery’ to connect that to the relay via its front panel serial connection.

Web monitor is no longer supported and does not operate on Windows 10. With the ever-changing versions of operating system, JAVA, and web browsers, this tool became too difficult to support. If you want to use web monitor, you will need to use Windows 7 (or a virtual Windows 7 PC inside of Windows 10).

While of little consolation to SIPROTEC 4 users, SIPROTEC 5 relays have a very nice set of web features that should be explored by all technicians!


  Checking the EPLD/FPGA on Siemens EN100 SCADA cards

When using Siemens SIPROTEC relays with Siemens PAS system not only is the EN100 interface firmware version important, so is the EPLD version. If you need to find the EPLD version, we have created a guide to show you how to do this. Notes on how to find both the firmware and EPLD version are available from our website Technical library in the SIPROTEC 4 section.

What is EPLD/FPGA?
Field-Programmable Gate Array (FPGA) is an integrated circuit designed to be configured after its manufacture. For example, Siemens can programme the FPGA to provide the desired functionality required in their product. Many FPGAs (but not all) can be reprogrammed, whereas an EPLD is an Erasable Programmable Logic Device (some use the term Electronic Programmable Logic Device).


  SIPROTEC 5 – Changing hardware

One of the many features of SIPROTEC 5 is being able to add IO expansions where needed. Some customers take the approach of having a ‘standard design’, but with a variation, such as small and larger version with more IO.

If using this approach, note that when testing while it is possible to load a ‘small’ setting to a ‘large’ relay, doing so is likely to result in errors and is discouraged. Essentially if loading the ‘small’ setting to the large relay, the relay will have hardware that is not identified in its settings, which can result in unexpected errors. Either remove the extra IO (and re-initialise the relay) or temporarily add the extra hardware to the ‘small’ setting.


  Reducing the size of DIGSI 5 Projects

DIGSI 5 projects can contain process data obtained from connected relays – that’s one of its uses, extracting a copy of a fault record. We recommend not just extracting the fault record but taking a copy of the entire setting file. The process is documented in our ‘DIGSI 5 Quick Note 0008’, where you will end up with the setting/project file with the process data contained.

However, if you have developed a standard setting file that is going to be used as a template for new device settings, you probably won’t need any fault records that came from the original relay, or downloaded from connected relays during scheme testing. These can be deleted from within DIGSI 5, but a quick and simple method (after taking a back-up) is to delete the folders and files in the project ‘UserFiles’ directory. There will be a directory present for each relay connected with its downloaded process data.


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