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RESOLUTION NO. __
, Series of
2017
ACCURACY LIMITS OF METERS AND
INSTRUMENT TRANSFORMERS
Article I.
GENERAL PROVISIONS
Section 1. These Rules/Guidelines shall be known as Accuracy Limits
of Meters and Instrument Transformers.
Section 2. Objectives. - These Rules aims to set the accuracy limits of
all meters and instrument transformers installed in the customers' premises.
Section 3. Applicability. - These Rules shall apply to the following:
All distribution utilities;
2. All types of customers; and
3. Redistributors
1.
Section 4. Definition of Terms.
American National
Standards
Institute (ANSI)
A private
non-profit
organization
that
oversees the development
of voluntary
consensus standards for products, services,
processes, systems, and personnel in the
United States.
Captive Market
Refers to electricity end-users who do not
have choice of a supplier of electricity, as may
be determined by the ERC in accordance with
the EPIRA.
Contestable Market
The electricity end-users who have a choice of
supplier of electricity, as may be determined
by the ERC in accordance with the EPIRA.
International
Electrotechnical
Commission (lEC)
A worldwide organization for Standardization
comprising all national electro technical
committees.
Instrument
Transformers
High accuracy class electrical devices used to
isolate or transform voltage or current levels.
National Institute of An agency under the u.s Department of
Standards
and Commerce,
which
has
the
assigned
Technology (NIST)
function of taking custody, maintenance,
and
development
of
the
national
standards
of measurements
and the
provision of means and methods for
making measurements
consistent
with
the ANSI standards
Watt-hour Meters
An energy measuring device at specific time.
Article II.
LIMITS FOR CAPTIVE MARKET
Section 5. Watt-hour Meters
All watt hour meters must be tested and sealed by the ERC prior to
installation in the customer's premises. Their accuracy limits shall not exceed
the error of plus or minus five-tenths percent (+/ -0.5) at specified test load.
Section 6. Instrument Transformer
All instrument transformer must be tested and sealed by the ERC prior
to installation in the customer's premises. Their accuracy limits shall not
exceed the error of plus or minus three-tenths percent (+ / -0.3) at specified
test load.
A. Transformation
Ratio Test
Instrument
Transformers
shall be tested of their accuracy
transformation ratio which should not exceed plus or minus three tenths
percent (+/-0.3).
B. Secondary Burden
The burden in each phase of the instrument transformer shall not
exceed
its specified burden.
Instrument
transformers
shall be
connected only to a revenue meter with a burden that will not affect the
accuracy of the measurement.
Article III
LIMITS FOR CONSTESTABLE MARKET
Section 7. Watt-hour
Meters
All watt hour meters must be tested and sealed by the ERC prior to
installation in the customer's premises.
All watt hour meter must comply with the appropriate IEC Standards or
their equivalent national standards for static watt-hour meter and other types
of meters, and be of 0.3 accuracy class based on the applicable ANSI standard,
or 0.2 accuracy class based on the applicable IEC standard.
Section 8. Instrument
Transformer
All instrument transformers shall be tested and sealed by the ERC prior
to installation.
A. Voltage Transformers
The voltage transformer shall have a minimum of 0.3 accuracy class
based on the applicable ANSI standard, or 0.2 accuracy class based on the
applicable IEC standard.
The"total burden of each secondary circuit of the voltage transformers
must not exceed the rated burden of the voltage transformer. In no case shall
the voltage drop from the voltage transformer secondary terminal to the input
voltage terminal of the billing meter be more than 0.17% of the nominal
secondary voltage rating of the voltage transformer.
B. Current Transformers
Current transformers shall be certified to have been tested for ratio and
phase deviation to be within the ANSI accuracy class of 0.3 or better'over the
entire measuring range of the metering facility.
.
Article IV
FINAL PROVISIONS
Section 9.Imposition of Fines and Penalties. Violation of any of
these Rules shall be subject to the imposition of fines and penalties in
accordance to the "Rules to Govern the Imposition of Administrative
Sanctions in the Form of Fines and Penalties
Republic Act No. 9136, As Amended."
Pursuant
to Section 46 of
Section 10. Exception Clause. Where good reason appears, the ERC
may allow an exception from any provision of these Rules, if such exception is
found to be in the public interest and is not contrary to law or any other
pertinent rules and regulations.
Section 11. Separability Clause. If any of the foregoing amendments
is declared unconstitutional or invalid, the other provisions which are not
affected thereby shall remain in force and effect, unless such declaration
would render the whole rules unenforceable or non-implementable.
Section 12. Repealing Clause. All Rules and Guidelines, or portion
thereof, issued by the ERC, which are inconsistent with these Rules are hereby
repealed or modified accordingly.
Section 13. Effectivity. These Rules shall take effect fifteen (15) days
after its publication in a newspaper of generation circulation in the country.