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December, 2020 ElEctronic Mfg SErvicES
Retrofit DME Solutions Comply with Upcoming NERC Requirements
By Stephen Armstrong
with an updated protection and control standard (PRC-002-2) for disturbance monitoring and re- porting requirements for transmission and genera- tion systems. The first milestone is 50 percent compliance by January 1, 2021, followed by 100 percent compliance by July 1, 2022. The objective is to be able to standardize
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regional reliability requirements and requires utilities to install disturbance monitoring equipment (DME). The data collected by this equipment enables NERC to conduct forensic analyses of power failures to detect the causes in order to improve the safety and reliability of power delivery management. “The NERC standard requires a continu-
ous, high-resolution 10-day recording of up to nine measurements per line of per-phase volts and amps, total MW and MVARs, and fre- quency,” says Bryan Gehringer, senior appli- cation engineer at NovaTech, provider of the Bitronics meters and IED solutions deployed in over 1,200 U.S. utilities. “In addition, dis- turbances of interest must be archived for three years.”
tilities are facing an upcoming 2022 dead- line from the North American Electric Reli- ability Corporation (NERC) to fully comply
Defining DME DME, as defined in the PRC002-02, must
monitor sequence of events recording (SER), fault recording (FR) and dynamic disturbance recording (DDR) data. SER and fault recording functions are already well understood and widely deployed
throughout the industry, but the DDR function is relatively new and generally available in more ex- pensive digital fault recorders (DFRs). Although the majority of 230 kV and higher
voltage substations are likely already constructed with DFRs, the requirement for DME placement is based on the MVA short-circuit capacity of the bus, which includes some lines down to 100 kV. That is a voltage level where DFRs are not typically part of the original design. In those locations, it may be necessary to
add recording capability to an operational substation where there may not be room to retrofit a traditional DFR, and where pulling new CT, PT and I/O cables to one location would be a major undertaking. Traditional microprocessor-based protec-
tive relays are also able to perform fault recording. But, they typically do not have the memory to monitor and store continuous flows of information for 10 days as required by the PRC standard.
A solution between relay-based recording and DFRs are small, three-phase, single-line power measurement devices.
Cost-Effective Retrofitting “Depending on protective relays to pro-
vide DDR data is clunky, expensive and main- Continued on next page
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