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  MORE than a supplier     HV Power Customer Newsletter March 2015    
           
        Directional Fault Passage Indicators    
 

    In this issue:

Photo - Warwick Beech

 Commentary

Warwick Beech

Doing things differently
- to do them better

At HV Power, we enjoy the challenge of introducing new technology, especially when it’s been developed to solve a problem or to provide the customer with better value, much improved reliability or perhaps better reporting.

A new solution however, can involve taking quite a different approach (e.g. using a new protection algorithm). For many customers, where the core application remains the same, but the new products are quite different, the challenge can be communicating the benefits through their organisation. Unless all the stakeholders in an organisation who interact with the new product or technology are aware of and understand the problem being addressed, they are unlikely to embrace the change, or embrace the need to do something different.

When swapping cars midway through a race – be prepared, the controls could be on the other side. You might want to warn your drivers.

Regards

Warwick

   

Horstmann Fault Passage Indicators are now available in New Zealand from HV Power following an agreement signed with Horstmann’s Australasian master distributor MV Technology. Following our intitial customer discussions, there has been a high level of interest in the Overhead Directional Fault Passage Indicators (SMART Navigator Directional). These are an obvious solution to networks where lines are, or can be, configured as a ring, or have an imbedded generation back feed.

Horstmann SMART Navigator Directional Fault Passage Indicators
Directional Indication via red/green LED indications.

The level of interest from lines companies on the Conductor Temperature Monitoring option of the SMART Navigators also took us by surprise. Please contact us for a copy of a presentation of how Powercor in Australia have implemented the SMART Navigator (Temperature Monitor), together with a weather station. This ultrasonic wind/direction add-on provides trouble-free, low wind-speed indications to input vital information into their computations.

Horstmann SMART Navigator with wind speed indicator
Ultrasonic wind speed and direction input for Conductor Temperature Monitoring.

 

What's is the common name?

Fault Passage Indicators are also referred to as Fault Current Indicators and Faulted Circuit Indicator amongst other names and combinations. What's do you think is the most common, or correct, name? Help us out by using this three- question survey to let us know your thoughts.... https://www.surveymonkey.com/r/N23HPVF

 

   
      Tekron TTM 01-G GPS Time Clock    
     

Last month we introduced the TTM 01-G as the logical replacement for the TTM 01-E.  We didn’t explain however that the TTM 01-G also has a fibre time signal output port which comes as standard. Therefore if you have IEDs that require IRIG-B or Pulse Per Second signals via fibre, then the TTM 01-G is an obvious choice.

The TTM 01-G comes supplied with:

  • 1 x fibre IRIG-B/pulse output
  • Optional NTP or NTP/PTP protocol (via copper or optional fibre Ethernet engineering port)
  • 1 x TTL IRIG-B output
  • A second output specified at the time of ordering, either;
    • 1 x TTL output (providing a second output)
    • 1 x AM IRIG-B output
    • 1 x HV MOSFET output
    • 1 x RS-232 Serial String output
Tekron TTM 01-G
Tekron TTM 01-G GPS Clock.

At our workshop we have recently been testing a Siemens Process Bus Merging Unit – which coincidently does require its IRIG-B signal via fibre. This is an indication of the future as more IED connections move to fibre – a future the TTM 01-G and other Tekron products are ready for!

Download the TTM 01-G datasheet.

 

   
      SIPROTEC 5, xx82 Series    
     

The final hardware version of the SIPROTEC 5 product range has been released from the development bench. The xx82 series is a lower cost, high I/O count series. The xx82 series is characterised by it not being able to be coupled with further I/O hardware (However, two expansion slots are provided for SCADA, Protection Data Interface or Arc Flash modules, etc).

Siemens SIPROTEC 5 7xx82 SeriesSiemens SIPROTEC 5 7xx82 Series

SIPROTEC 5 7xx82 Series, left 11 binary inputs 9 outputs, right 23 binary inputs 16 outputs.

7SJ82

  • Overcurrent protection relay, 11/9 or 23/16 binary inputs/outputs
  • Overcurrent protection relay (8 x CT inputs), with 7/7 binary inputs/outputs
  • Directional overcurrent protection relay 11/9 or 23/16 binary inputs/outputs

7SK82

  • Motor protection relay, 11/9 or 23/16 binary inputs/outputs
  • Motor protection relay, 11/9 or 23/16 binary inputs/outputs and 4 VT inputs

7SD82

  • Line Diff protection relay, 11/9 or 23/16 binary inputs/outputs and 4 VT inputs.
  • Options for 2-ended, 3-ended or 4-6 ended lines (i.e. multi-terminal)

7SL82

  • Combination Distance and Differential Relay – hardware choices similar to 7SD82

7UT82

  • Two winding transformer protection relay (8 x CT), 7/7 binary inputs/outputs
  • Able to function as one end of a Line Diff scheme (see our Feb newsletter for this exciting new topology)

 

 

   
     

WinPQ Mobil V2.2.4 for PQ-Box 100/200 Power Quality Analyser

   
     

The latest software update for the PQ-Box 100 includes several notable features

  • Change to Stacked Traces for most graphs, allowing easier identification of traces when displaying several different measurements.
  • An 'online' status screen to display the number of events and remaining memory etc in a remote PQ-Box.
  • LCD display of energy consumption since start of measurement.

Check out our Technical Library write up if you are interested in the full details of the new features, or simply download (free) the new version from here.

SIPROTEC Line Protection Options
WinPQ Mobil Stacked Traces.

 

   
     

Who do you call for Technical Support?(0800 HV CALL)

   
     

HV Power has set up an 0800 number (0800 HV CALL , 0800 48 2255) for direct contact with our technical support team. Please feel free to use this 0800 number for all your technical support needs.

For sales and general enquiries, contact our Auckland or Wellington Sales teams:

  • Auckland: 09 377 2001
  • Wellington: 09 387 7339

 

   
Services Section Double Point, Status Inputs to REG-D/DA

The Paragramer feature of the REG-D/DA uses the status of various switching devices associated with each transformer to automatically determine the parallel status of every transformer in a parallel control scheme:

ParaGramer for automatic control of parallel transformers
Circuit breaker and bus section display which control parallel programme activation.

Some common examples of the status inputs used include the circuit breaker (PG:CB) and the bus section (PG_SC1), as shown above. These inputs are commonly brought into the REG-D/DA as a single-point logic signal, often at 110 Vdc.

But what happens when one of these signals fails (for example, if a rodent chews through the cable, or a loose connection develops in the input circuit)? Besides a dead rat (hopefully) in perhaps 90 % of applications, 0 V on the status input represents an open breaker or open bus section. The REG-D/DAs will detect this as being that the transformers are now in Independent Mode, when in fact they are still connected to the same bus. Slight variations in the measured bus voltage can then cause the REG-D/DA’s to begin working/regulating against each other and tapping apart to control the bus voltage.

A misconception amongst some users is that the REG-D/DAs in such a situation will ultimately lock out, because either the circulating current has become excessive, or because the Permissible Difference of Taps limit has been violated. However, both of these checks are only active for transformers in parallel, because independent transformers must be free to operate independently. The result is that although the bus voltage remains in the bandwidth, the actual circulating current can become dangerously large as the transformers tap further and further apart.

New protection options with copper pilot wires
WinREG parallel operation backup supervision.

Fortunately, A.Eberle has a simple solution to this issue: double point inputs. By connecting both a N/O and a N/C contact to the REG-D/DA from each status input, and inverting one of them, the REG-D/DA will automatically use both of the contacts to determine the status of the bus status input.

Only the ‘01’ and ‘10’ states are considered valid. If an ‘00’ or ‘11’ error states occur:

  • The status input is assumed to be in the closed state, thereby preventing the REG-D/DAs from going into Independent Mode (other behaviour can be programmed if required).
  • The standard relay function 83:PG_INERR is raised for alarm purposes (see our technical library for the full list of possible I/O functions).
  • The breaker/section display on the Paragramer display will rotate to indicate an undefined condition, warning the operator/technician.

 

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