December, 2020
www.us-tech.com
Retrofit DME Solutions Comply with Upcoming NERC Requirements
Continued from previous page
tenance-intensive,” says Gehringer. “Even if a utility could stream all the data from the relays to a central computer in real time, the band- width required is massive and the amount of storage space needed would add to the cost.” Utilities, therefore, have a need for simpli-
fied, economical solutions that can be retrofit- ted into existing substations to ensure compli- ance with PRC-002-2. According to Gehringer, one solution between relay-based recording and DFRs are small, three-phase single-line devices that can utilize existing CTs and PTs that are already routed to protective relays. This is an attractive retrofit option that is more cost effective than installing full-size DFRs. These intelligent electronic de-
vices (IEDs) are purpose-built for this task and only require the space of a relay.
One solution on the market, the
70 Series made by Bitronics, is com- pliant with NERC standards in SER, FR and DDR recording. Operating at a rate of 30 samples per second, it captures frequency, total watts and VARs and all three phases of volt and phase amps. One of the specific challenges of
the new NERC standard is preserving 10 days of continuous DDR recording data. R8 in the PRC-002 distinguishes continuous DDR recording from trig- gered DDR recording. Continuous is preferred.
Bitronics M871 The Bitronics M871 resolves
this issue by supporting multiple log- ical recording functions in each unit. Each logical recorder includes two in- dependent fault recorders, two inde- pendent disturbance recorders, a trend recorder and a SER recorder. The various logical recorders in
the unit can capture data often with a different duration, range and resolu- tion. They can also be triggered by entirely different criteria and can be programmed to operate simultane- ously or independently. Because each logical recorder
requires a few seconds to convert the data and store it in non-volatile memory, the disturbance recorders are run in alternating hours produc- ing a sequence of common format for transient data exchange (COM- TRADE) files that are each one hour in duration. By allocating sufficient memory
to store 240 hour-long COMTRADE files, no data is lost and a circular buffer is created that resides on the M871 with new data overwriting old data after ten days. In other words, the DDR data does not need to be streamed in real time across a net- work to a separate computer. It does not even need to be
downloaded, organized or archived, except when NERC requests the da- ta. At that point, only the data in the range of time NERC requests needs to be downloaded. In addition to providing all the
recorded data required for PRC-002- 2, the IEDs are expandable and can provide additional real-time data to supervisory control and data acquisi- tion (SCADA) systems with tremen- dous accuracy. The IEDs can be configured to
perform power quality functions not available in a protective relay, effec-
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tively operating as a substation SCADA recorder device. In this way, the unit can provide more in- formation on current and power than a power quality meter, which is usually focused mostly on voltage anomalies. As utilities assess their options for compli-
ance with the NERC standard, the emergence of the IED-based distributed event recording mod- el sits between protective relays and DFRs on the recording spectrum, offering better record- ing capabilities than relays and lower costs and easier deployment than DFRs. Contact: NovaTech, LLC, 1720 Molasses
Bitronics M871 power measurement system.
Way, Quakertown, PA 18951 % 484-812-6000 Web:
www.novatechweb.com r
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