Blondel Compliance

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Blondel Compliance
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Blondel Compliance

• Update to IMO Wholesale Revenue Metering Standard
  V2.0
• Section 4.3.3 - Considerations for non-Blondel
  Meter Installations
• a. 3 CTs and 2 PTs (phase-N) using 2.5 element
  meter
• b. 3 CTs (delta connected) and 2 PTs (phase-N)
  using 2 element meter
• c. 2 CTs and 3 PTs (69V phase-N) using a 2
  element meter
• d. 2 CTs and 2 PTs using 2 element meter where
  Neutral is not available
• Section 4.4.1 - Registration of non-Blondel Meter
  Installations
• At seal expiry, MI registered under 4.3.3b must
  be upgraded to 4.3.3a with a conforming 2.5
  element Main meter that calculates the missing
  voltage and records the missing voltage (V2h) in
  channel 6 (ION Meter)

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Blondel Compliance

• Section 4.3.2 - Compliance with Measurement
  Canada Rulings
• Existing installations shall comply with any
  future Measurement Canada rulings on two and
  one-half element metering (or two-element
  metering, using three delta connected current
  transformers and two voltage transformers
  connected phase to ground). As per Measurement
  Canada Bulletin E-24E (rev.1) dated 2002-11-29,
  5.1 Effective April 1, 2003, all new and all
  reconstruction of existing 3- phase 4-wire wye
  configured metering installations shall use
  metering that is compliant to Blondels theorem
  such as 3-element metering. An example of a
  reconstructed metering installation may include
  service upgrades and, or instrument transformer
  replacement. Reconstruction of existing metering
  installation, sites that do not have sufficient
  physical space to accommodate the additional
  voltage transformer will not be required to meet
  5.1 above

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Blondel Compliance
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Blondel Compliance

• In some cases, the Metering requirements may
  differ depending on the location of the Meter
  Installation
• Within a facility (TS)
• Grounded system requires 3 element metering.
  PTs connected phase-neutral for 4 distribution
  system or phase-ground for 3 wire distribution
  system.
• Ungrounded system requires 2 element metering
• Within a distribution system (outside of TS)
• 4-Wire distribution requires 3 element metering -
  27.6 kV Wye
• 3-Wire distribution requires 2 element metering -
  46 kV (Wye or Delta)

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Blondel Compliance

• What happens when meter is not located at the
  defined Meter Point (feeder meter located outside
  of the TS)?
• Meter Installation is 2 element but declared
  non-Blondel
• Non-Blondel MECs apply
• Do we need to simplify the metering requirements
  for NEW meter installations?
• 3 element meter installation irregardless of the
  of wires (3 or 4) or meter location.
• Research industry practices and develop standard.
  
• IMO and NRC to perform study on non-Blondel
  installations (2 element metering on a grounded
  system).