S-E-XX—Specification for the Installation and Use of Electricity Meters Approved and Verified to be Used in Establishing Processed Legal Units of Measure (PLUM)

S-E-XX—Specification for the Installation and Use of Electricity Meters Approved and Verified to be Used in Establishing Processed Legal Units of Measure (PLUM) (PDF, 53 KB, 11 pages)

Category: ELECTRICITY
Specification: S-E-XX
Document(s):
Issue Date: 2012-XX-XX
Effective Date: 2012-XX-XX
Supersedes:

Table of Contents

1.0 Scope

This specification applies to all electricity meters and ancillary devices which are verified pursuant to the Electricity and Gas Inspection Act and installed for use as a source device for purposes of establishing PLUM outside of an approved meter.

2.0 Authority

This specification is issued under the authority of section 12(2) of the Electricity and Gas Inspection Regulations.

3.0 References

3.1 S-E-06 - Specification for the Approval of Type of Electricity Meters and Auxiliary Devices - Amendments to Measurement Canada Specification LMB-EG-07.

3.2 S-E-02 - Specifications for the Verification and Reverification of Electricity Meters.

4.0 Background

This Specification is established as a result of, and in accordance with, the Recommendations for Establishing Electricity LUM Outside an Approved Meter – Final Report, and the Measurement Canada Decisions on VA JWG and LUM JWG Recommendations, 2008-11-28.

5.0 Terminology

Processed LUM (PLUM)

means a legal unit of measure that has been derived outside an approved and verified meter from one or more SLUM, recognized units of measure, metrology constants or multipliers (as applicable), through a mathematical algorithm.

Source LUM (SLUM)

means an approved and verified legal unit of measure extracted from an approved and verified meter. Examples: Wh, varh, VAh, joule, W, var and VA.

True Value

means the value that would be determined using a reference meter that is certified and traceable to Canadian national standards and corrected for any known bias errors indicated on the certificate.

6.0 Requirements for Establishment of PLUM outside of an Approved Meter

6.1 PLUM may be established outside a meter only where source data is obtained from:

  1. An electricity metering installation subject to section 8.0.
  2. An electricity metering installation subject to section 9.0.

6.2 PLUM may be established from load profile data only if the internal clock of each source device installed is synchronized to within 90 seconds of a time reference traceable to the National Research Council of Canada time reference.

6.3 Acceptable SLUM to PLUM Conversions

PLUM may be established pursuant to any of the following four categories.

6.3.1 Energy PLUM calculated from Energy SLUM Cumulative Registers

6.3.1.1 Single Point of Metering
  1. A Wh energy SLUM may be converted into a Wh energy PLUM.
  2. A varh energy SLUM may be converted into a varh energy PLUM.
  3. A VAh energy SLUM may be converted into a VAh energy PLUM.
6.3.1.2 Multiple Points of Metering
  1. Wh energy SLUM of like direction may be totalized into a Wh energy PLUM.
  2. Varh energy SLUM of like direction may be totalized into a varh energy PLUM.
  3. The values of SLUM shall be obtained from each point of metering on the same day.

6.3.2 Maximum Demand PLUM calculated from a Maximum Demand SLUM Register

6.3.2.1 Single Point of Metering
  1. A watt maximum demand SLUM may be converted into a watt maximum demand PLUM.
  2. A var maximum demand SLUM may be converted into a var maximum demand PLUM.
  3. A VA maximum demand SLUM may be converted into a VA maximum demand PLUM.
6.3.2.2 Multiple Points of Metering

Maximum demand SLUM may be totalized from multiple sources subject to the requirements of section 6.5 (c).

6.3.3 Energy PLUM calculated from SLUM Load Profile (LP) Data

6.3.3.1 Single Point of Metering
  1. Wh energy SLUM LP data may be converted into a Wh energy PLUM.
  2. Varh energy SLUM LP data may be converted into a varh energy PLUM.
  3. VAh energy SLUM LP data may be converted into a VAh energy PLUM.
6.3.3.2 Multiple Points of Metering
  1. Wh energy SLUM LP data of like direction may be totalized into a Wh energy PLUM.
  2. Varh energy SLUM LP data of like direction may be totalized into a varh energy PLUM.
  3. Totalized Wh energy SLUM LP data and totalized varh energy SLUM LP data may be converted into a VAh energy PLUM subject to the following conditions:
    1. The load profile interval length does not exceed five minutes.

    2. VAh energy is calculated for each interval on an interval-by-interval basis in accordance with the following formula:

      Totalized VAh = √((Whd1 + Whd2)² − ((Q1 varh1 + Q1 varh2) − (Q4 varh1 + Q4 varh2))²)
    3. The real-time clock of each meter are synchronized relative to each other with a maximum tolerance of 9 seconds.

6.3.4 Maximum Demand PLUM calculated from SLUM Load Profile Data

6.3.4.1 Single Point of Metering
  1. Wh energy SLUM LP data may be converted into a watt maximum demand PLUM.
  2. Varh energy SLUM LP data may be converted into a var maximum demand PLUM.
  3. VAh energy SLUM LP data may be converted into a VA maximum demand PLUM.
6.3.4.2 Multiple Points of Metering
  1. Wh energy SLUM LP data of like direction may be totalized and converted into a watt maximum demand PLUM.
  2. Varh energy SLUM LP data of like direction may be totalized and converted into a var maximum demand PLUM.
  3. Totalized Wh energy SLUM LP data and totalized varh energy SLUM LP data may be converted into a VA maximum demand PLUM subject to the following conditions:
    1. The load profile interval length does not exceed five minutes.

    2. Maximum VA demand is calculated for each interval on an interval-by-interval basis in accordance with the following formula:

      Totalized VA = √((Whd1 + Whd2)² − ((Q1 varh1 + Q1 varh2) − (Q4 varh1 + Q4 varh2))²) × (Interval time (minutes) / 60)
    3. The real-time clock of each meter are synchronized relative to each other with a maximum tolerance of 9 seconds.

Note: Refer to Appendix 1 for a listing of all allowable SLUM to PLUM conversions.

6.4 PLUM calculated from multiple points of metering shall meet the same accuracy and resolution criteria that they would be required to meet if they were calculated as SLUM.

6.5 Where PLUM is calculated from multiple points of metering, the following demand measurement options shall apply:

  1. the maximum demand value is measured for each individual circuit and declared for billing independently; or
  2. the coincidental maximum demand value is determined for the combined circuits and subsequently added; or
  3. the demand is totalized in a manner that is representative of the quantities that would be measured if the power were supplied from a single circuit, using methods specified by Measurement Canada approval specifications.

7.0 Limits of Error

The value of a PLUM established by any process outside of an approved meter shall not exceed an error of ± 1.0%, with a resolution of 0.1%, relative to the true value of that LUM.

8.0 Installations of LUM Compliant Meters and Devices

8.1 All installations which are comprised completely of meters and devices that have been approved and verified as source meters and/or devices in accordance with the applicable approval and verification specifications shall be subject to the installation requirements established in section 11.0.

8.2 These installations will be regarded as a form of telemetering system which is subject to the policies of bulletin GEN-33. In case of a disagreement between the reading established and recorded in the source meter's register and the reading obtained through the use of telemetering devices and systems, the source meter's register reading will be deemed to be correct.

9.0 Installations of non-LUM Compliant Meters and Devices

9.1 All installations which include a meter or a device that has not been approved or verified in accordance with the applicable approval and verification specifications shall be subject to the validation requirements established in section 10.0.

9.2 Installations which include instrument transformers not compliant with the specification established in section 11.2 shall be subject to the validation requirements established in section 10.0.

10.0 Validation Requirements

10.1 PLUM shall be validated according to the same requirements and tolerances which are used to verify a corresponding SLUM contained within an approved and verified meter (refer to Limits of Error).

10.2 Records of all applicable source device data shall be retained by the meter owner (as prescribed by the Regulations).

10.3 The approval and verification status of all applicable functions of each source device (including current and potential transformers) shall be confirmed.

10.4 The authenticity and integrity of transported data shall be validated by a method developed and implemented by the meter owner.

10.5 The process and any algorithms used for converting SLUM data into PLUM values for billing shall be documented and validated by the meter owner.

10.6 Compliance with the requirement on device clock synchronization shall be validated by the meter owner.

10.7 Demand interval length shall be validated by the meter owner.

10.8 Energy and/or maximum demand PLUM shall be validated by the meter owner to confirm congruence with the corresponding energy and/or maximum demand SLUM stored in the source meter(s).

10.9 Validation Frequency

10.9.1 The frequency at which a meter owner performs validation shall be documented by the meter owner.

10.9.2 Initial validation of all installations subject to validation shall be performed between April 1, 2013 and December 31, 2013.

10.9.3 Subsequent validations shall occur at minimum:

  1. each time one of the installed devices is replaced or reconfigured, and
  2. each time a new PLUM is added, and
  3. each time a PLUM calculation is changed.

10.10 All validation results shall be retained by the meter owner for purposes of audit by Measurement Canada. Audit will include examination of the authenticity and integrity validation method, the conversion validation method, confirmation that billing multipliers correspond to the installation's meter multiplier, CT and PT ratio, installation multiplier and Kp values, as applicable, and an assessment to determine that the PLUM values for billing can be traced back to, and are associated with, the correct source devices.

11.0 Installation requirements

11.1 Source meters

11.1.1 Installed meters shall have an approved and verified register which presents stored values of all LUM's which correspond to any PLUM used for billing.

11.1.2 The meter owner shall ensure that no generated load profile data of questionable integrity is used in the establishment of PLUM. This could include, (but is not limited to), load profile data generated during a time interval where meter clock time is adjusted.

11.1.3 The maximum demand register (of meters equipped with such) shall be reset at the end of a billing period to which the current maximum demand is applicable.

11.1.4 Source meter load profile data used in establishment of maximum demand PLUM shall be of sufficient accuracy and resolution such that the calculated PLUM value does not exceed an error tolerance of ± 1.0% relative to true value with a resolution of 0.1%.

11.1.5 Source meter load profile data used to establish a maximum demand PLUM shall be retained in meter owner records in accordance with the Electricity and Gas Inspection Regulations.

11.1.6 The corresponding cumulative energy register values of the source meter shall be read, and stored by the meter owner, upon each transfer of load profile data used for the purposes of establishing maximum demand. Where transfer of load profile occurs more than once per day, the cumulative energy register need only be read and stored once per calendar day.

11.1.7 Source meters used in the establishment of maximum demand PLUM shall be capable of displaying the value of maximum demand that existed at the time of the most recent maximum demand reset.

11.2 Instrument Transformers

Instrument transformers, where installed, shall be approved to the following accuracy classes: potential transformers shall be accuracy class 0.6 or better and current transformers shall be accuracy class 0.3 or better.

11.3 Data Initiators

11.3.1 Data initiators which are external to a source meter shall be connected correctly to the meter in accordance with the data initiator connection diagram.

11.3.2 Data initiators which are external to a source meter shall provide data capable of being recorded to a resolution of 0.1% at 20% of the maximum current of the meter which is sourcing the data initiator.

11.3.3 Installed data initiators shall generate data representative of a LUM only in the direction (delivered or received) indicated on the data initiator identifier.

11.3.4 The data initiator multiplier (or pulse constant) must correspond with the multiplier (or constant) identified on data recorders, in conversion devices and functions, or within processes used in the establishment of a PLUM value from that data.

11.4 Data Recorders

11.4.1 Data recorders shall be connected correctly to compatible source devices in accordance with the data recorder connection diagram.

11.4.2 Data recorders shall record data to the same degree of resolution as it is received.

11.4.3 Data recorders shall only record data representative of a LUM only in the direction (delivered or received) indicated on the data recorder identifier.

11.5 Conversion Devices and Functions

11.5.1 Conversion devices shall be connected correctly to compatible source devices in accordance with all applicable device connection diagrams.

11.5.2 Conversion devices shall provide output data and/or LUM values to the same degree of resolution as the input data received.

12.0 Additional Information

For additional information regarding this specification, please contact the Senior Program Officer responsible for electricity measurement, or visit our website.

Alan E. Johnston
President

Appendix 1

Action Meter(s) SLUM PLUM Conversion Acceptable?

Key:

SLUM:

Source Legal Units of Measure

PLUM:

Processed Legal Units of Measure

X1:

Meter 1

X2:

Meter 2

XT:

Totalized

Note: With regards to totalization, the VA calculation shall be performed using interval data on an interval-by-interval basis.
Energy PLUM from Energy SLUM Cumulative Registers Single Wh1 Wh1 Yes
varh1 varh1 Yes
VAh1 VAh1 Yes
Wh1 & varh1 VAh1 No
VAh1 & Wh1 varh1 No
VAh1 & varh1 Wh1 No
Multiple Wh1 & Wh2 WhT Yes
varh1 & varh2 varhT Yes
VAh1 & VAh2 VAhT No
WhT & varhT VAhT No
Max Demand PLUM from Max Demand SLUM Registers Single W1 W1 Yes
var1 var1 Yes
VA1 VA1 Yes
W1 & var1 VA1 No
VA1 & W1 var1 No
VA1 & var1 W1 No
Multiple W1 & W2 WT No
var1 & var2 varT No
VA1 & VA2 VAT No
Energy PLUM from SLUM Load Profile Data Single Wh1 Wh1 Yes
varh1 Varh1 Yes
VAh1 VAh1 Yes
Wh1 & varh1 VAh1 No
VAh1 & Wh1 varh1 No
VAh1 & varh1 Wh1 No
Multiple Wh1 W1 Yes
varh1 var1 Yes
VAh1 & VAh2 VAhT No
WhT & varhT VAhT Yes - See Note 1
Max Demand PLUM from SLUM Load Profile Data Single Wh1 W1 Yes
varh1 var1 Yes
VAh1 VA1 Yes
Wh1 & varh1 VA1 No
VAh1 & Wh1 var1 No
VAh1 & varh1 W1 No
Multiple Wh1 & Wh2 WT Yes
varh1 & varh2 varT Yes
VAh1 & VAh2 VAT No
Wh1 & varhT VAT Yes - See Note 1