Understand the basics of site verification, from its importance to installation verifications. TESCO's Rob Reese goes over what you need to know about site verification and detailed testing theory and equipment.
At the 2021 North Carolina Electric Meter School, Tom Lawton gave the Opening Keynote on smart meters and the increasingly important role the meter is playing in the smart grid.
Did you know vehicle manufacturers have announced over 100 electric vehicle models are to be introduced by 2024? This presentation was given at the Southeastern Distribution Apparatus School in Auburn, AL and covers Electric Vehicle Service Equipment (EVSE) and the testing of Electric Vehicle stations. This presentation covers types of EVSEs, market growth, regulatory environment and type approval and testing.
Given by SAMSCO's John Kretzschmar, this presentation covers the basics of meter testing including: why we test; how to test; types of meter tests; how utility tests differ from customer request tests; in-service testing; and what to do with the test data.
The best way to be sure you are getting the correct revenue from a site is to test the entire site. Learn how to find any diversions, corrosion, broken or frayed wiring as well as all the tests you can perform while at a site.
At the 2021 North Carolina Electric Meter School, Tom Lawton gave the Opening Keynote on smart meters and the increasingly important role the meter is playing in the smart grid.
Did you know vehicle manufacturers have announced over 100 electric vehicle models are to be introduced by 2024? This presentation was given at the Southeastern Distribution Apparatus School in Auburn, AL and covers Electric Vehicle Service Equipment (EVSE) and the testing of Electric Vehicle stations. This presentation covers types of EVSEs, market growth, regulatory environment and type approval and testing.
Given by SAMSCO's John Kretzschmar, this presentation covers the basics of meter testing including: why we test; how to test; types of meter tests; how utility tests differ from customer request tests; in-service testing; and what to do with the test data.
The best way to be sure you are getting the correct revenue from a site is to test the entire site. Learn how to find any diversions, corrosion, broken or frayed wiring as well as all the tests you can perform while at a site.
This presentation goes over common terms in the industry including: basic electricity, form numbers, wiring diagrams, AC circuits, self contained metering, demand metering, and transformer rated metering.
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To subject Electric Meters to non-nominal conditions more similar to what meters would experience in the field as opposed to the nominal operating conditions typically used when testing meter accuracy in a shop environment.
This presentation was given at MEUA Meter School and gives an introduction to meter testing and discusses why we test, how we test, the types of meter tests, what to do with test data and more. 03/03/20
This presentation was given at MEUA Meter School and gives attendees an introduction to meter testing. Topics covered include: why do we test; how do we test; field testing; complaint testing; general meter testing requirements; new meter testing programs; return to service testing; in-service testing; statistical test plans; tracking meter records, and more! 03/03.20
The best way to be sure you are getting the correct revenue from a site is to test the entire site. Learn how to find any diversions, corrosion, broken or frayed wiring as well as all the tests you can perform while at a site.
This presentation reviews the different methods of communicating to your meters, the reasons for them, and some of the testing and challenges related to them.
This presentation was given at the PREA Meter School and gives an overview of AMI including an overview of the technologies, the benefits, how AMI is changing the industry, and what the future looks like. 03/10/20.
Then … Now … and Tomorrow. This presentation discusses how meters, loads, and communications have changed over the years and why it is important today. Standards Changes are reviewed as well as new definitions.
This presentation covers differences between self-contained and instrument or transformer rated sites; transformer rated meter forms; test switches and CTs; Blondel's Theorem; meter accuracy testing; checking the health of your CTs and PTs; and site verification (and not just meter testing). This presentation was given at the PREA Meter School. 03/10/20.
Learn the differences between self-contained and transformer or instrument rated meter sites, test switches and CTs, Blondel’s Theorem, meter accuracy testing, site verification, and more! This presentation was given at MEUA Meter School. 03.03.20
This presentation was given at the PREA Meter School and gives an overview of AMI including an overview of the technologies, the benefits, how AMI is changing the industry, and what the future looks like.
This presentation covers differences between self-contained and instrument or transformer rated sites; transformer rated meter forms; test switches and CTs; Blondel’s Theorem; meter accuracy testing; checking the health of your CTs and PTs; and site verification (and not just meter testing). This presentation was given at the PREA Meter School.
Take a look at different meter configurations, and be sure to watch the presentation for a further look into how these work and to hear what other industry professionals have to say.
This presentation was requested by the Nebraska Meter Conference and covers all the components of field testing and best practices including a site check list, field test kits and hot socket repair kits.
This presentation is an overview of the ANSI C12 Standards that pertain to electric metering. This presentation was given at the PREA Meter School. 03/10/20.
Over much of the 20th century, utilities, regulators and customers each relied upon lab and field meter testing efforts which were primarily focused upon the accuracy of the watt-hour meter and demand register.
This focus is now changing with overwhelming deployment of electronic meters and significant deployment of AMR and AMI meters throughout the installed base in North America.
The focus has now shifted to the metering installation as a whole and not the accuracy of the meter.
Over much of the 20th century, utilities, regulators and customers each relied upon lab and field meter testing efforts which were primarily focused upon the accuracy of the watt-hour meter and demand register. This focus is now changing with overwhelming deployment of electronic meters and significant deployment of AMR and AMI meters throughout the installed base in North America. The focus has now shifted to the metering installation as a whole and not the accuracy of the meter.
This presentation goes over common terms in the industry including: basic electricity, form numbers, wiring diagrams, AC circuits, self contained metering, demand metering, and transformer rated metering.
This presentation discusses the importance of testing meters and the best practices and test equipment to do so. This presentation was given at MEUA Meter School. 03.03.20
To subject Electric Meters to non-nominal conditions more similar to what meters would experience in the field as opposed to the nominal operating conditions typically used when testing meter accuracy in a shop environment.
This presentation was given at MEUA Meter School and gives an introduction to meter testing and discusses why we test, how we test, the types of meter tests, what to do with test data and more. 03/03/20
This presentation was given at MEUA Meter School and gives attendees an introduction to meter testing. Topics covered include: why do we test; how do we test; field testing; complaint testing; general meter testing requirements; new meter testing programs; return to service testing; in-service testing; statistical test plans; tracking meter records, and more! 03/03.20
The best way to be sure you are getting the correct revenue from a site is to test the entire site. Learn how to find any diversions, corrosion, broken or frayed wiring as well as all the tests you can perform while at a site.
This presentation reviews the different methods of communicating to your meters, the reasons for them, and some of the testing and challenges related to them.
This presentation was given at the PREA Meter School and gives an overview of AMI including an overview of the technologies, the benefits, how AMI is changing the industry, and what the future looks like. 03/10/20.
Then … Now … and Tomorrow. This presentation discusses how meters, loads, and communications have changed over the years and why it is important today. Standards Changes are reviewed as well as new definitions.
This presentation covers differences between self-contained and instrument or transformer rated sites; transformer rated meter forms; test switches and CTs; Blondel's Theorem; meter accuracy testing; checking the health of your CTs and PTs; and site verification (and not just meter testing). This presentation was given at the PREA Meter School. 03/10/20.
Learn the differences between self-contained and transformer or instrument rated meter sites, test switches and CTs, Blondel’s Theorem, meter accuracy testing, site verification, and more! This presentation was given at MEUA Meter School. 03.03.20
This presentation was given at the PREA Meter School and gives an overview of AMI including an overview of the technologies, the benefits, how AMI is changing the industry, and what the future looks like.
This presentation covers differences between self-contained and instrument or transformer rated sites; transformer rated meter forms; test switches and CTs; Blondel’s Theorem; meter accuracy testing; checking the health of your CTs and PTs; and site verification (and not just meter testing). This presentation was given at the PREA Meter School.
Take a look at different meter configurations, and be sure to watch the presentation for a further look into how these work and to hear what other industry professionals have to say.
This presentation was requested by the Nebraska Meter Conference and covers all the components of field testing and best practices including a site check list, field test kits and hot socket repair kits.
This presentation is an overview of the ANSI C12 Standards that pertain to electric metering. This presentation was given at the PREA Meter School. 03/10/20.
Over much of the 20th century, utilities, regulators and customers each relied upon lab and field meter testing efforts which were primarily focused upon the accuracy of the watt-hour meter and demand register.
This focus is now changing with overwhelming deployment of electronic meters and significant deployment of AMR and AMI meters throughout the installed base in North America.
The focus has now shifted to the metering installation as a whole and not the accuracy of the meter.
Over much of the 20th century, utilities, regulators and customers each relied upon lab and field meter testing efforts which were primarily focused upon the accuracy of the watt-hour meter and demand register. This focus is now changing with overwhelming deployment of electronic meters and significant deployment of AMR and AMI meters throughout the installed base in North America. The focus has now shifted to the metering installation as a whole and not the accuracy of the meter.
Over much of the 20th century, utilities, regulators and customers each relied upon lab and field meter testing efforts which were primarily focused upon the accuracy of the watt-hour meter and demand register.
This focus is now changing with overwhelming deployment of electronic meters and significant deployment of AMR and AMI meters throughout the installed base in North America.
The focus has now shifted to the metering installation as a whole and not the accuracy of the meter.
As many utilities have elected to deploy advanced metering systems and millions of new solid-state, microprocessor based end-points with communications under glass, a dramatic shift has begun regarding where metering resources are being deployed and what they are doing.
This presentation will highlight the new value proposition for metering personnel at their respective utility companies in this AMI dominated World.
Examples of issues which have arisen or been identified over the course of various deployments and in the immediate aftermath of an AMI deployment.
Over much of the 20th century, utilities, regulators and customers each relied upon lab and field meter testing efforts which were primarily focused upon the accuracy of the watt-hour meter and demand register.
This focus is now changing with overwhelming deployment of electronic meters and significant deployment of AMR and AMI meters throughout the installed base in North America.
The focus has now shifted to the metering installation as a whole and not the accuracy of the meter.
Presented at the North Carolina Electric Meter School. 6/2013
Over much of the 20th century, utilities, regulators and customers each relied upon lab and field meter testing efforts which were primarily focused upon the accuracy of the watt-hour meter and demand register.
This focus is now changing with overwhelming deployment of electronic meters and significant deployment of AMR and AMI meters throughout the installed base in North America.
The focus has now shifted to the metering installation as a whole and not the accuracy of the meter.
The objective of this presentation is to understand the need and best practices for meter and instrument transformer testing in an AMI World including: acceptance and functional testing during and after AMI, Certification, Accuracy testing in the shop and field, Blondel's theorem and why this matters to us in metering, Site Verification and not just meter testing, Instrument Transformer Testing (in shop and in field), and AMI meter population management.
In this presentation, you will learn the basics - differences between self contained and transformer or instrument rated meter sites, transformer rated meter forms, test switches and CT's, meter accuracy testing in the field, checking the health of your CT's and PT's, and site verification
Over much of the 20th century, utilities, regulators and customers each relied upon lab and field meter testing efforts which were primarily focused upon the accuracy of the watt-hour meter and demand register.
This focus is now changing with overwhelming deployment of electronic meters and significant deployment of AMR and AMI meters throughout the installed base in North America.
The focus has now shifted to the metering installation as a whole and not the accuracy of the meter.
This presentation was given with LUCELEC at the CARILEC CEO & Leadership Conference and covers system loss and what to do to reduce it; why transformer rated metering is important; site verification and not just meter testing; and management systems and utilizing AMI data to control and reduce billing errors.
This presentation discusses:
- Best practices regarding the need to ensure that all transformers used for metering circuits are properly sized
- The ability to optimize revenue regardless of customer usage over time
- Best practices to ensure that transformers and meters have been installed correctly in the field and continue to perform in the same fashion
- Best practices for certifying the accuracy class of the transformers and how to best set up a shop testing and field testing/verification program.
- What the costs of implementing such a system and what the costs of not implementing such a system can be.
This presentation was given at the PREA Meter School and gives an overview of self-contained metering, including why we test, how we test, the different types of meter tests, what to do with the data, and more. 03/10/20.
This presentation was given during the 2022 Southeastern Meter School in Auburn, AL. Understand the need and best practices for instrument transformer testing in an AMI world, including why and how to test, and what range of tests and checks to perform in the shop and in the field.
As many utilities have elected to deploy advanced metering systems and millions of new solid-state, microprocessor based end-points with communications under glass, a dramatic shift has begun regarding where metering resources are being deployed and what they are doing.This presentation will highlight the new value proposition for metering personnel at their respective utility companies in a post-AMI World.
Examples of issues which have arisen or been identified over the course of various deployments and in the immediate aftermath of an AMI deployment.
Highlights of the new value proposition for metering personnel at their respective utility companies in a post-AMI world. Examples of issues which have arisen or been identified over the course of various deployments and in the immediate aftermath of an AMI deployment. 6/2014.
Highlights of the new value proposition for metering personnel at their respective utility companies in a post-AMI world. Examples of issues which have arisen or been identified over the course of various deployments and in the immediate aftermath of an AMI deployment. Presented at the North Carolina Electric Meter School. 6/2013
This presentation covers the basics of meter testing including: why we test; how to test; types of meter tests; how utility tests differ from customer request tests; in-service testing; and what to do with the test data.
As many utilities have elected to deploy advanced metering systems and millions of new solid-state, microprocessor based end-points with communications under glass, a dramatic shift has begun regarding where metering resources are being deployed and what they are doing.
This presentation will highlight the new value proposition for metering personnel at their respective utility companies in a post-AMI World.
Examples of issues which have arisen or been identified over the course of various deployment
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Site Verification for Newer Employees
1. 1
10/02/2012 Slide 1
Site Verification for
Newer Employees
Prepared by Rob Reese, TESCO
The Eastern Specialty Company
For NREA – Nebraska Rural Electric Association
February 9, 2021
2. 2
Site Verification
• Why is Site Verification Important?
• More than Meter Testing
• Testing and Inspecting the Entire Service
• Self-Contained vs. Transformer-Rated Meter Installations
• Self-Contained Meter Installation Verifications
• What to Inspect and Test
• Transformer-Rated Meter Installation Verifications
• What to Inspect and Test
• Detailed Testing Theory and Equipment
• Meter Accuracy
• CT Burden, Ratio, Admittance
• Vectors and Harmonics
• Hot Socket
3. 3
What is Site Verification?
Testing and inspection of more than just the
meter accuracy.
99.975% Registration
4. 4
Premise
• Over much of the 20th century, utilities, regulators and customers each
relied upon lab and field meter testing efforts which were primarily focused
upon the accuracy of the watt-hour meter and demand register.
• This focus is now changing with the deployment of electronic AMR and
AMI meters to the majority of the 155 Million connected customers in North
America.
• The focus has now shifted from just the accuracy of the meter to also
checking other features of the meter (e.g. communication and disconnect
devices), the firmware versions and settings of the meter, and the overall
meter installations for both residential and C&I customers.
• Incorrect or miscalculated site information or undetected problems can
lead to an improperly metered customer not related to the meters accuracy
and could also lead to potential safety issues.
5. 5
Field Testing
Common Features and Common Sources of Concern
Electro Mechanical meters were
subject to registration errors caused
by mechanical issues with moving
parts resulting in either the loss of
revenue to the utility or over billing
for the customer. Some of the more
common problems were:
• Friction wear
• Gear mesh misalignment
• Retarding magnet failure
• Timing motors
6. 6
Electronic Meters – new failure modes require
new testing and inspection methods
Electronic meters fail as do electromechanical meters
but differently
• Their overall life expectancy is not nearly the same
• Failure modes include drift (unexpected)
• Failure modes include catastrophic (expected)
• Power supply damage due to lightning surges or other
causes
• LCD Display failures making a visual read impossible
when required
• AMR/AMI communications module failures requiring a field visit to repair or replace meter/AMI
module and get a read for billing purposes
• Failure modes include non-catastrophic but significant measurement error modes sometimes
attributed to improper meter programming and in some cases meter firmware issues.
• Failure modes can include non-measurement issues which render the meter ineffective or
inaccurate for billing purposes
• Clerical errors such as incorrect multipliers can do more damage than even the most catastrophic
equipment failure in the field.
7. 7
Best Practices
• Residential vs Commercial
• Self-Contained vs Transformer Rated
• Follow the money and be as proactive as possible
8. 8
• A meter test may not catch intermittent errors or identify errors with
other equipment at the site, e.g. CT’s & PT’s
• A discrepancy between what is thought to be at a given site and
what is actually at that site can cause a major billing error (either
over or under billed)
Why Site Verifications are a
Valuable Utility Tool
• It is important to remember that with
current systems it is not just the meter
that can cause a major error in the
measurement of a given service
• A meter test that indicates a meter is
within the required accuracy
parameters does not mean your service
is being measured and billed accurately
9. 9
• While these numbers will vary from
utility to utility the basic premise
should be the same for all utilities
regarding where Meter Services
should focus their efforts –
follow the money.
Why C&I and what should we invest our
limited meter service resources here?
• Easy Answer: Money.
• These customers represent a disproportionately large
amount of the overall revenue for every utility in North
America.
• For some utilities the ten percent of their customers
who have transformer rated metering services can
represent over 70% of their overall revenue.
10. 10
• Most Utilities do not have a comprehensive and
complete list of every instrument transformer on
their system that is involved in providing the billing
for the largest 10 to 20% of any utilities revenue.
• Most Utilities do not visit, document and verify
these same services on any regular basis.
• Best practices call for the on-site verification of a
Utilities “largest” customers on a periodic basis.
– There is no definition of what this verification
should entail
– There is no definition of what “largest” means
– There is no agreement on the frequency of this
“periodic” inspection
What are the opportunities that can be found in
this work and what are our industry’s “Best
Practices” for this type of work?
11. 11
• A facility with an electric bill of $10,000 per month would pay for a meter tech in two years if
an error affecting the wiring of only one transformer (estimated lost revenue $160,000 over
a two year period). Does this mean that $10,000 per month or more defines large?
Define “Largest” and what this may represent
• Largest should be defined by revenue.
• Lost metering revenue is no longer
“recovered in the next rate case”, nor is
recovered metering revenue necessarily
“given back” in the next rate case.
• Utility Commissions are having less
tolerance for new rate cases.
• Over billing of any customer has always
been a public relations nightmare.
12. 12
• A facility with an electric bill of $10,000 per month would pay for a meter tech in two years if
an error affecting the wiring of only one transformer (estimated lost revenue $160,000 over
a two year period). Does this mean that $10,000 per month or more defines large?
– I would argue that this size customer is universally a “Large customer” and that from here
each utility should decide how much smaller they should go in their definition of “Large”.
Define “Largest” and what this may represent
• Largest should be defined by revenue.
• Lost metering revenue is no longer
“recovered in the next rate case”, nor is
recovered metering revenue necessarily
“given back” in the next rate case.
• Utility Commissions are having less
tolerance for new rate cases.
• Over billing of any customer has always
been a public relations nightmare.
13. 13
• If changes in usage, equipment failures in the metering service,
external damage to the service, or energy diversion at a single
“large” customer can pay for a single meter tech in just two or three
years, and a single meter tech can handle several of these
inspections in a single day, then there is ample cost justification for
inspecting these services at least once every year.
Define “Periodically” and how
frequent this may be
19. 19
Self-Contained Metering Verification
Potential tasks to be completed:
Double check the meter number, the location the test result
and the meter record
Perform a visual safety inspection of the site. This includes
utility and customer equipment. Things to look for include
intact down ground on pole, properly attached enclosure,
unwanted voltage on enclosure, proper trimming and site
tidiness (absence of discarded seals, etc.)
Visually inspect for energy diversions (intentional and not).
This includes broken or missing wires, jumpers, unconnected
wires and foreign objects on meters or other metering
equipment. Broken or missing wires can seriously cause the
under measurement of energy.
Visually check lightning arrestors for damage.
Check for proper grounding and bonding of metering
equipment. Poor grounding and bonding practices may result
in inaccurate measurements that go undetected for long
periods of time. Implementing a single point ground policy and
practice can reduce or eliminate this type of issue.
20. 20
Self-Contained Metering Verification
Verify service voltage.
Verify condition of metering control wire. This includes looking
for cracks in insulation, broken wires, loose connections, etc.
Test meter for accuracy. Verify demand if applicable with
observed load. If meter is performing compensation (line and/or
transformer losses) the compensation should be verified either
through direct testing at the site or by examining recorded pulse
data.
Look for signs of excessive heat on the meter base - melted
plastic or discoloration related to heat
21. 21
Transformer-Rated Metering Verification
Potential list of tasks to be completed:
Double check the meter number, the location the test result and the
meter record
Perform a visual safety inspection of the site. This includes utility and
customer equipment. Things to look for include intact down ground on
pole, properly attached enclosure, unwanted voltage on enclosure,
proper trimming and site tidiness (absence of discarded seals, etc.)
Visually inspect for energy diversions (intentional and not). This includes
broken or missing wires, jumpers, open test switch, unconnected wires
and foreign objects on meters or other metering equipment. Broken or
missing wires can seriously cause the under measurement of energy. A
simple broken wire on a CT or VT can cause the loss of 1/3 to 1/2 of the
registration on either 3 element or 2 element metering, respectively.
Visually check lightning arrestors and transformers for damage or leaks.
Check for proper grounding and bonding of metering equipment. Poor
grounding and bonding practices may result in inaccurate measurements
that go undetected for long periods of time. Implementing a single point
ground policy and practice can reduce or eliminate this type of issue.
Burden, Ratio, and/or Admittance test CTs and voltage check PTs.
22. 22
Transformer-Rated Metering Verification
Burden, Ratio, and/or Admittance test CTs and voltage check PTs.
Verify service voltage. Stuck regulator or seasonal capacitor can
impact service voltage.
Verify condition of metering control wire. This includes looking for
cracks in insulation, broken wires, loose connections, etc.
Compare the test switch wiring with the wiring at the CTs and VTs.
Verify CTs and VTs not cross wired. Be sure CTs are grounded in
one location (test switch) only.
Check for bad test switch by examining voltage at the top and
bottom of the switch. Also verify amps using amp probe on both
sides of the test switch. Verify neutral connection to cabinet
(voltage).
Check rotation by closing in one phase at a time at the test switch
and observing the phase meter for forward rotation. If forward
rotation is not observed measurements may be significantly
impacted as the phases are most likely cancelling each other out.
Test meter for accuracy. Verify demand if applicable with observed
load. If meter is performing compensation (line and/or transformer
losses) the compensation should be verified either through direct
testing at the site or by examining recorded pulse data.
23. 23
Transformer-Rated Metering Verification
Verify metering vectors. Traditionally this has been done using
instruments such as a circuit analyzer. Many solid state meters
today can provide vector diagrams along with volt/amp/pf and
values using meter manufacturer software or meter displays. Many
of these desired values are programmed into the meters
Alternate/Utility display. Examining these values can provide much
information about the metering integrity. It may also assist in
determining if unbalanced loads are present and if CTs are sized
properly. The vendor software generally has the ability to capture
both diagnostic and vector information electronically. These
electronic records should be kept in the meter shop for future
comparisons.
If metering is providing pulses/EOI pulse to customers, SCADA
systems or other meters for totalization they also should be verified
vs. the known load on the meter. If present test/inspect isolation
relays/pulse splitters for things like blown fuses to ensure they are
operating properly.
Verify meter information including meter multiplier (rework it), serial
number, dials/decimals, Mp, Ke, Primary Kh, Kr and Rate. Errors in
this type of information can also cause a adverse impact on
measured/reported values.
26. 26
Testing Theory and Equipment
Meter Accuracy Testing – A Comparison Test
CURRENT
SOURCE
POTENTIAL
SOURCE
ENERGY
REFERENCE
STANDARD
XXXXXXXXX
27. 27
Testing Theory and Equipment
Meter Accuracy Testing – A Comparison Test
CURRENT
SOURCE
POTENTIAL
SOURCE
ENERGY
REFERENCE
STANDARD
XXXXXXXXX
Watthour Meter
- Measures Electrical Energy (kWh)
Potential (V) * Current (I) = Power (W)
Power Over Time = Energy (kWh)
28. 28
Testing Theory and Equipment
Meter Accuracy Testing – A Comparison Test
CURRENT
SOURCE
POTENTIAL
SOURCE
ENERGY
REFERENCE
STANDARD
XXXXXXXXX
Energy Reference Standard
- Measures Electrical Energy (kWh)
- Higher Accuracy Class
- Traceability to SI
29. 29
Testing Theory and Equipment
Meter Accuracy Testing – A Comparison Test
CURRENT
SOURCE
POTENTIAL
SOURCE
ENERGY
REFERENCE
STANDARD
XXXXXXXXX
- Apply the Same Voltage and Current to the Standard and Meter for a Defined Period of Time
- Standard and Meter Should Measure the Same Energy
- The Difference is the Error of the Meter
30. 30
Testing Theory and Equipment
Meter Accuracy Testing – A Comparison Test
CURRENT
SOURCE
POTENTIAL
SOURCE
ENERGY
REFERENCE
STANDARD
XXXXXXXXX
Example:
Standard Registers 100kWh / Meter Registers 101.38
Then the Error of the Meter is 1.38%
37. 37
Burden Rating
The burden range, present in the secondary
circuit, that the manufacturer will guarantee
their CT’s will still accurately function, in
regards to the ratio specification.
38. 38
Ratio Testing
Ratio of Primary Current to Secondary Current
5A
PHASE A
SOURCE LOAD
400A
400A
400A
5A
5A
Calculate
Ratio
39. 39
Burden Testing
Functionality with Burden Present on the Secondary Loop
PHASE A
Some burden will always be
present – junctions, meter coils,
test switches, cables, etc.
CT’s must be able to maintain
an accurate ratio with burden on
the secondary.
40. 40
Burden Testing
Functionality with Burden Present on the
Secondary Loop
PHASE A
Some burden will always be
present – junctions, meter coils,
test switches, cables, etc.
CT’s must be able to maintain
an accurate ratio with burden on
the secondary.
41. 41
Burden Testing
Functionality with Burden Present on the Secondary Loop
Example Burden Spec:
0.3% @ B0.1, B0.2, B0.5
or
There should be less than the 0.3%
change in secondary current from initial
(“0” burden) reading, when up to
0.5Ohms of burden is applied
42. 42
Burden Testing
Functionality with Burden Present on the Secondary Loop
ANSI Burden Values
0.1 Ohms
0.2 Ohms
0.5 Ohms
1 Ohms
2 Ohms
4 Ohms
8 Ohms
46. 46
Admittance Testing
• What is Admittance?
• Admittance testing measures the
overall “health” of the secondary
loop of the CT.
• Measured in units of MiliSiemens
(mS)
• Admittance is the inverse of
impedance.
• Impedance is the opposition to
current.
• Therefore, admittance testing
measures the overall “health” of
the secondary loop of the CT.
47. 47
Admittance Testing
• Admittance testing devices inject an audio sine
wave signal into the secondary loop of the CT.
• The resulting current is measured.
• The voltage of the initial signal is known.
• From these two parameters, the impedance,
and thus the admittance can be calculated.
48. 48
Admittance Testing
• Admittance test results are not immediately
intuitive.
• Some analysis and interpretation is need.
• What do all these mS values mean?
52. 52
Questions and Discussion
Rob Reese
TESCO – The Eastern Specialty Company
Bristol, PA
215-310-8809 (cell)
This presentation can also be found under Meter
Conferences and Schools on the TESCO website:
www.tescometering.com