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LOW VOLTAGE TRANSFORMERS INSTRUMENTATION CURRENT
PEARL Reconditioning Standards
Revision
Section
Number
Date
LOW VOLTAGE
TRANSFORMERS
INSTRUMENTATION CURRENT
1440
3
2-11-03
1440 - 1
PEARL
The term "reconditioning" is defined as "the process of returning electrical equipment to safe and
reliable operating condition based on the design of the original manufacturer at the time of
manufacturing.
I
TEST EQUIPMENT
The following test equipment is required to perform the testing requirements of this
reconditioning standard:
1. Insulation Resistance Test Set (Megohmeter) 1000 Vdc minimum
One of the following pieces of test equipment is required to perform the current
transformer ratio verification testing requirements of this reconditioning standard:
1. Transformer Turns Ratiometer
2. AC Voltage Supply and Voltmeter (+/- 0.5%)
3. AC Current Supply and an Ammeter (+/- 0.5%)
4. Self-Contained Transformer Test Set
One of the following pieces of test equipment is required to perform the current
transformer polarity testing requirements of this reconditioning standard:
1. AC Voltage Supply and Voltmeter
2. AC Current Supply and an Ammeter
3. Self-Contained Transformer Test Set
One of the following pieces of test equipment is required to perform the current
transformer saturation testing requirements of this reconditioning standard:
1. AC Voltage Supply and Voltmeter
2. AC Current Supply and an Ammeter
3. Self-Contained Transformer Test Set PEARL Reconditioning Standards
Revision
Section
Number
Date
LOW VOLTAGE
TRANSFORMERS
INSTRUMENTATION CURRENT
1440
3
2-11-03
PEARL
1440 - 2
II RECONDITION EVALUATION
These steps are used to determine what will be required to recondition this product under
this standard.
1 INSPECTION
1.1
Case/Frame
1.1.1 Ensure that the nameplate data is legible.
1.1.2 Ensure that the third party listing service label is legible.
1.1.3 Inspect for signs of corrosion.
1.1.4 Inspect all connections for missing hardware.
1.1.5 Inspect for cracks.
1.1.6 Inspect for signs of overheating.
1.1.7 Inspect shorting switch for proper operation and connection.
1.1.8 Record results on appropriate PEARL Inspection and Test Form. PEARL Reconditioning Standards
Revision
Section
Number
Date
LOW VOLTAGE
TRANSFORMERS
INSTRUMENTATION CURRENT
1440
3
2-11-03
1440 - 3
PEARL
III RECONDITIONING PROCEDURES
The following procedures are in a recommended order and are required to recondition
this product. PEARL recognizes that, based on actual product design and as found
condition, some of these procedures may not be applicable. The testing requirement must
be completed before the product can be labeled as a PEARL reconditioned product.
1 RECONDITIONING
1.1
Case/Frame
1.1.1 Disassemble to clean.
1.1.2 Clean all parts of contamination and corrosion.
1.2
Missing or Defective Components, Parts and Hardware
1.2.1 Replace or repair any missing or defective components, parts and
hardware found during the inspection phase of this standard.
1.3
Final Assembly
1.3.1 Ensure that the nameplate/label data is complete, correct and legible. PEARL Reconditioning Standards
Revision
Section
Number
Date
LOW VOLTAGE
TRANSFORMERS
INSTRUMENTATION CURRENT
1440
3
2-11-03
PEARL
1440 - 4
2 TESTING
2.1
Insulation Resistance
2.1.1 Primary to ground test
2.1.1.1 Perform an insulation resistance test at test voltage
specified in Table 6 of Section 6000. The test duration
shall be for 1 minute.
2.1.1.2 Correct for temperature, if necessary (Table 11).
2.1.1.3 Record results on appropriate PEARL Inspection and Test
Form.
2.1.2 Secondary to ground test
2.1.2.1 Perform an insulation resistance test at test voltage
specified in Table 6 of Section 6000. The test duration
shall be for 1 minute.
2.1.2.2 Correct for temperature, if necessary (Table 11).
2.1.2.3 Record results on appropriate PEARL Inspection and Test
Form.
2.1.3 Primary to secondary test
2.1.3.1 Perform an insulation resistance test at test voltage
specified in Table 6 of Section 6000. The test duration
shall be for 1 minute.
2.1.3.2 Correct for temperature, if necessary (Table 11).
2.1.3.3 Record results on appropriate PEARL Inspection and Test
Form.
2.1.4 Compare test results to manufacturer's recommendations or Table 6
of Section 6000.
2.1.5 The test results must be within the guidelines recommended in order
for the product to become a PEARL labeled product.
2.2
Transformer Turns Ratio Verification
2.2.1 Perform a turns ratio test from primary to secondary.
2.2.2 Record results on appropriate PEARL Inspection and Test Form.
2.2.3 Compare test results to manufacturer's recommendations or
industrial standards.
2.2.4 The test results must be within the guidelines recommended in order
for the product to become a PEARL labeled product.
2.3
Transformer Saturation Test
2.3.1 Perform a saturation test on the current transformer.
2.3.2 Record results on appropriate PEARL Inspection and Test Form.
2.3.3 Compare test results to manufacturer's recommendations or
industrial standards.
2.3.4 The test results must be within the guidelines recommended in order
for the product to become a PEARL labeled product. PEARL Reconditioning Standards
Revision
Section
Number
Date
LOW VOLTAGE
TRANSFORMERS
INSTRUMENTATION CURRENT
1440
3
2-11-03
1440 - 5
PEARL
2.4
Transformer Polarity
2.4.1 Perform a polarity test on the current transformer.
2.4.2 Record results on appropriate PEARL Inspection and Test Form.
2.4.3 Compare test results to manufacturer's recommendations or
industrial standards.
2.4.4 The polarity must be correctly marked in order for the product to
become a PEARL labeled product.
IV PEARL CERTIFICATION
This product has now been reconditioned under the PEARL Reconditioning Standard. The
PEARL label and/or seal may be placed on it.