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| MORE than a supplier | HV Power Customer Newsletter March 2015 | |||||
| Directional Fault Passage Indicators | ||||||
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In this issue: Services Section: 
Commentary Warwick Beech Doing things differently
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.  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.  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
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| Tekron TTM 01-G GPS Time Clock | ||||||
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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:
 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.
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| SIPROTEC 5, xx82 Series | ||||||
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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).
SIPROTEC 5 7xx82 Series, left 11 binary inputs 9 outputs, right 23 binary inputs 16 outputs.
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WinPQ Mobil V2.2.4 for PQ-Box 100/200 Power Quality Analyser |
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The latest software update for the PQ-Box 100 includes several notable features
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.  WinPQ Mobil Stacked Traces.
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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:
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| Services Section | Double Point, Status Inputs to REG-D/DA | |||||
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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:  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.
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:
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| Copyright 2015 HV Power Measurements and Protection Ltd | ||||||
