Annex F Instrument Transfomers Subcommittee

March 26, 201 Savannah, Georgia

Chair: Ross McTaggart

F.1 Instroductions

F.2 Quorum

16 members + 16 Guests – quorum attained

F.3 Approval of minutes – St Louis meeting

F.4 Approval of Agenda

F.5 Working Group Reports

F.5.1 Working Group on Current Transformers with mA range (WG C57.13.7) - Chair: Henry Alton, Vice-Chair: Adnan Rashid

Introductions

Acceptance of the Agenda

House Keeping - Henry Alton of TRIACTA Power Technologies Inc.

Review actions from the last meeting

Answers to questions from the last meeting

Presentations.

None

Next Steps

Balloting and vote Final revision of document

Embark on the release process

Old Business (House Keeping)

A single piece of old business was to generate a new draft based on comments received since the last meeting.

New Business

A new draft of C57.13.7 was tabled with all of the previous changes implemented. A summary of changes in draft 4 are as follows; Page 1 of 6 Please find attached the updated version D4 with some inclusions of information as follows;  Participants o Updated the Working Group Members list  1.0 Overview o Updated commentary to more specifically state the objective in the light of comments that I have received.  4.0 Ratings o Primary values of 600A and 800A have been added as per the previous draft to make 80mA-100mA equal  6.2 Basic Measurement Accuracy Class o Item h) slight correction based on comments received.  6.4 Requirements for Accuracy and Accuracy of Calibration Systems o Added based on comments received

There were no objections to these additions during this meeting.

There was additional change requested by Dr. Eddy So of NRC.

Introduction

This introduction is not part of PPC57.13.7/DD4, Draft Standard for Draft Standard for Current Transformers with Maximum mA Secondary Current of 250mA.

This standard was prepared by the Working Group on mA Current Transformers of the Instrument Transformer Subcommittee of the Transformers Committee of the IEEE Power Engineering Society. The purpose of this standard is not only to allow the evaluation, certification and specification of mA current transformers similar to the present process available for 5A secondary output current transformers, since 80mA and 100mA current transformers are now approved in Canada, but also to take into consideration certain applications in the use of the mA CTs that has the advantage of a much lower voltage drop in the secondary leads when the burden is located at a farther distance from where the installed ma CT is located. Also, for the same voltage drop across the burden as that when using a 5 A CT, its power dissipation in the burden is much less than that when using the 5A CT. However, with a mA CT,care should be taken to minimize environmental interference due to the much lower secondary current as compared to that of the 5A CT, since it would be more susceptible to noise/interference, etc.

Ross McTaggart of Trench and Adnan Rashid of Measurement Canada had the following comments for changes to the document during the meeting;  Figure 2 X axis Scale is not correct Ross McTaggart  -10 should be -20 -5 should be -10 Ross McTaggart  Header correction for the Standard Title Ross McTaggart  There needs to be some detail added for the test methods for mA CTs Ross McTaggart  Participants List had a typo OC 57.13 which should read C57.13.7

Page 2 of 6 Adnan Rashid

Actions from this meeting

Action Assigned to Item Action 1: Henry Alton  Comments should be implemented in a new draft “D5”. Action 2: Dr. Eddy So  Provide the clauses for test methods in this standard  Eddy SO will provide a forecasted date of availability of test methods drafting complete for review. The posting with all of the changes will be coordinated with this date. Action 3: Henry Alton  Post a new draft “D5” when the test methods have been received. Action 4: All Participants  Provide your IEE Membership numbers to Henry Alton for preparation of the Balloting Roster Action 5: Henry Alton  Prepare the balloting roster on the eTools “MyProject” account for this working group. Action 6: All Participants  If there are no further comments after draft 5 the working group will vote to accept that version as final via email or conference call. C57.13.7 WG  Formal balloting and vote to accept and IEEE and release as a new standard

F.5.2 TF on Station Service Voltage Transformers - D Wallace

Introductions

Membership

32 people were in attendance with 19 people requesting membership.

Quorum

Since this was the first official meeting of the Work Group, a quorum was not called for.

Approval of Minutes from the minutes from the St. Louis meeting

Old Business Protection Schemes: Pressure Relays Primary Overcurrent Secondary Overcurrent

Fred Elliot suggested that any information for protection schemes be placed in an Annex. Insulation Systems:

Pierre Riffon will provide information concerning SF6 insulation Page 3 of 6 Ross McTaggart will provide information on Non-thermally Upgraded Oil Paper

Accuracy of Metering Windings: David Wallace presented an insert regarding accuracy requirements. There was a robust discussion concerning the accuracy requirements. Several topics were covered. Among these were:

1. At what power loading is the metering accuracy guaranteed. 2. Using the metering winding for protection relaying. 3. Should the metering winding be considered an auxiliary winding.

A survey will be sent to the committee to get their input into the direction to proceed with the metering winding.

New Business

Patrick Rock suggested looking at C57.12.20 to see if any information from it would be applicable to the C57.13.8 standard.

David Wallace invited the committee to review the current draft of C57.13.8 and provide comments on it. A spreadsheet will be sent out to the committee for the members to enter their suggestions. These spreadsheets will be returned and the data compiled to be discussed at the fall meeting.

F.5.3 Working Group for Revision of IEEE C57.13 Instrument Transformers - R. McTaggart

Introductions

Quorum

14 members + 18 Guests – quorum attained

Approval of minutes – St Louis meeting (PR / DW)

Approval of Agenda

Review of schedule and the progress presented.

Review of poll results – decision that multiplier to be used in the 72 kV and lower PD test voltage would be 1.2 as it was the median value.

PAR extension to be applied for prior to October deadline.

Discussion

The idea of a meeting or conference call possibly around May 7th was discussed. An update to draft 4 should be available prior to this meeting/conference call. A survey will be sent to determine the best dates and location for this meeting.

A brief review of the next steps was made. This includes a vote of 2/3 of the working group members approving the draft version, submission and a majority approval by the members of the subcommittee and finally a submission to Bill Bartley so the draft can be setup as a project for balloting.

Don Kline made a few comments regarding PD from a historical view point and the early testing of instrument transformers.

Page 4 of 6 Don Kline gave a presentation of two stage CTs and spoke on transducers a demonstration was also made. Vladimir Khalin asked questions regarding the accuracy certification of such a system and also inquired as to how often this arrangement is currently used industry.

Prior to the end of the meeting a further discussion concerning a possible meeting or conference call was brought up again. An emailed survey will be sent out to determine the availability of working group members.

With no additional new business brought up a motion to dismiss was made. David Wallace and Vladimir Khalin provided confirmation of the motion.

F.6 ITSC Adjournm

Page 5 of 6 Page 6 of 6