Consultation — Policy for the Interchangeability and Interoperability of In-Service Milliampere Current Transformers
Policy for the Interchangeability and Interoperability of In-Service Milliampere Current TransformersMeasurement Canada (MC) is launching a consultation seeking comments from industry stakeholders on the proposed Policy for the Interchangeability and Interoperability of In-service Milliampere Current Transformers. This consultation will be of primary interest to electricity sub-metering stakeholders, electricity meter owners and electricity meter manufacturers. The consultation period starts on May 4, 2012 and ends on June 1, 2012.
A large number of multiple customer metering systems (MCMS) are already installed in the field with unapproved milliampere (mA) current transformers (CTs). The mA CT used with MCMS has always been considered as integral to the system, and therefore each mA CT was characterized to a specific MCMS input. This makes the re-verification of such systems very difficult and expensive because the mA CT must be removed with the MCMS in order to re-verify any metering point or the whole system. In 2011, MC approved the first mA CT pursuant to S-E-09 - Specification for the Approval of Type of 80mA and 100mA class Measuring Current Transformers.
MC has developed this new policy using the rationale that a currently installed mA CT which can be shown to be equivalent to an approved mA CT shall be subject to the same policies as for the approved device. This policy is intended to establish clear rules and criteria for interchangeability and interoperability of such transformers used with MCMS.
Please send your written comments to the undersigned before June 1, 2012.
Luc Tessier
Senior Program officer
Measurement Canada
2665 King West St., Office 600
Sherbrooke, QC J1L 2G5
Telephone: 819-564-5737
Fax: 819-564-5740
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