Blondel Compliance

Blondel Compliance• Update to IMO Wholesale Revenue Metering Standard V2.0• Section 4.3.3 - Considerations for non-Blondel Meter

Installationsa. 3 CT’s and 2 PT’s (phase-N) using 2.5 element meter

b. 3 CT’s (delta connected) and 2 PT’s (phase-N) using 2 element meter

c. 2 CT’s and 3 PT’s (69V phase-N) using a 2 element meter

d. 2 CT’s and 2 PT’s 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)

Blondel Compliance• Section 4.3.2 - Compliance with Measurement Canada

RulingsExisting 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 Blondel’s 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”

Blondel Compliance

Blondel CompliantTSTransformer station (TS) has a wye secondary that iseither grounded through impedance or is solidlygrounded. The ground/neutral is not brought outsidethe station. Three current transformers and threevoltage transformers connected phase to ground/neutral are inputs to a 3 element meter.

M

3 Element

Blondel CompliantTS Transformer station has a delta or ungrounded wyesecondary. Two current transformers and two voltagetransformers connected phase to phase are inputs toa 2 element meter.

M

2 Element

Blondel Compliant Transformer station has a wye secondary that iseither grounded through impedance or solidlygrounded. The neutral is brought outside the station.Three current transformers and three voltagetransformers connected phase to neutral are inputsto a 3 element meter.

Blondel Compliant Transformer station has a delta or ungrounded wyesecondary. The neutral is brought outside the station.Two current transformers and two voltagetransformers connected phase to phase are inputs toa 2 element meter on the line side or the load side ofthe grounding bank.

GroundingBank

VT

VT

TS

M

3 Element

VT

TS

M

2 Element

VT4 Wire Distribution

4 Wire Distribution

3 Wire Distribution

3 Wire Distribution

Blondel CompliantGrounding

Bank

TS

3 Element

4 Wire Distribution

M

VT

Transformer station has a delta or ungrounded wyesecondary. The neutral is brought outside the station.Three current transformers and three voltagetransformers connected phase to ground/neutral areinputs to a 3 element meter on the load side of thegrounding bank.

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. PT’s 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)

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 MEC’s 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).