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Reproduced By GLOBAL ENGINEERING DOCUMENTS With The Pennission of NEMA Under Royalty Agreement
NEMA STANDARDS TRANSFORMERS,
NO. TR 1-1993
REGULA TORS AND REACTORS
National Electrical Manufacturers Association 2101 L Street, N.W. Washington, DC 20037
©1994 by National Electrical Manufacturers Association
GENERAl.. ...............•..••..•..••.........•..•.•.. 1 Preferred \Ultage Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . • . . . . . • . 1 Forced-Air (FA) and Forced-Oil (FOA) Ratings ...........•... .•. 1 Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . • . . .. . . . • . 2 Radio Influence \Ultage Levels . . . . . . . . . . . . • . . . . . . . . . • . • . . . • • . . . 2 Power Factor of Insulation of Oil-Immersed Transfonners. • . • . . . . . . . . . . . . . . . . . • . . • • . • . • . . • . . • . • . • • . 2 Audible Sound Levels . . . . . • . • . • . • . . . . . . • . • • • . . • . . • . . • • • . . . . 2 roWER lRANSFOR1v1ERS .. :................................ 5
PART 1 PART 2 PART 3 PART 4 PARTS PART 6 PART 7
DISTRIBUTiON TRANSFORMERS Design Test for Enclosure Security ofPadmounted Comparttnental Transformers . . . . . . . . . . . . . . . • . . . . . . . . . . . . . • . . . 7 SECONDARY NEIWORK TRANSFORMERS DRY-TYPE TR.ANSFO~ TERlvfiNOLOGY
•.•.................
.....••......•..•........•..•..•. ..•...•.••••.•..•..........
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . • . . . . . . . ·15 . . . . • . . • . . . • . . . . . . . . • • . • . 17 . . . . . . . . . . . . . . . . . . • . . . • . . . . . . . • . . . • . . . . . . . . . . . . . . . • . . . . . . . . . . . . • .. .. .• .• . • . • . . . . . • . . ..• .. .. .• . . . . . . . . 17 20 21 ·22 23 27 29 . . . . . 31
JEST CODE . . . . . . . . . . .. . . . . . . . Test Code for Measurement of Radio Influence Voltage Levels . . . . . . . . . . • . . . . . Transformer Test Report . • . . . . . . . . . . Transformer Impulse Test Report . • . • . . . Reactor Test Report . . . . . . . . . . • . . . CURRENT-LIMITING REACTORS
TRANSMISSION AND DISTRIBUTiONVOLTAGE ARC FURNACE TRANSFORMERS
REGULAWRS
. . . . . . . . . . . . . . . . . . . . . . . . . • . . . . 25 .......................•.......
SHUNT REAC10RS
..................•.....•........•.... THREE":PHASE QISTRIBUTiON TRANSFORMERS.
UNDERGROUND-TYPE
The standards appearing in this publication have been developed by the Transformer Section and have been approved for publication by the National Electrical Manufacturers Association. They are used by the electrical industry to promote production economies and to assist users in the proper selection of transformers, The Transformer Section is working actively with the American National Standards Committee, C57, on Transformers, Regulators and Reactors, in the development, correlation and maintenance of national standards for transformers. This Committee operates under the procedures of the American National Standards Institute (ANSI). It is the policy of the NEMA Transformer Section to remove material from the NEMA Standards Publication as it is adopted and published in the American National Standard C57 series. The NEMA Standards Publication for Transformers, Regulators and Reactors references these and other American ·National Standards applying to transformers, and is intended to supplement, without duplication, the American National Standards. The NEMA Standards Publication for Transformers, Regulators and Reactors contains provision for the following: a. b. American National Standards adopted by reference and applicable exceptions approved by NEMA, if any. NEMA Official Standards Proposals. These are official drafts of proposed standards developed within NEMA or in cooperation with other interested organizations, for consideration by ANSI. They have a maximum life of five years, during which time they may be approved as American National Standards or adopted as NEMA Standards, or rescinded. Manufacturing Standards. These are NEMA Standards which are primarily of interest to the manufacturers of transformers and which are not yet included in an American National Standard. Standards Which Are Controversial. These are NEMA Standards, on which there is a difference of opinion within Committee C57. The NEMA version will be included in the NEMA Standards Publication until such time as the differences between ANSI and NEMA are resolved.
NEMA Standards Publications are subject to periodic review and take into consideration user input. They are being revised constantly to meet changing economic conditions and technical progress. Users should secure latest editions. Proposed or recommended revisions should be submitted to: . Vice President, Engineering Department National Electrical Manufacturers Association 2101 L Street, N.W. Washington, D.C. 20037-1526
This publication provides a list of all ANSI C57 Standards that have been approved by NEMA. In addition it includes certain NEMA Standard test methods, test codes, properties, etc., of liquid-immersed transformers, regulators, and reactors that are not American National Standards.
TR 1-1993
The following American National Standards have been approved as NEMA Standards and should be inserted in this Part 0: ANSIIIEEE C57.12.00-1988 ANSIIIEEE C57.12.01-1989 ANSI C57.12.10-1988 General Requirements for Liquid-Immersed Transformers Distribution, Power and Regulating Transformers
General Requirements for Dry Type Power and Distribution
Requirements for Transformers 230,000 volts and below, 8331958-8333110,417 kVA single-phase 7501862-60,000180,0001100,000 kVA three phase, including supplements Terminal Markings and Connections for Distribution and Power Transformers Test Code for Liquid-immersed Distribution, Power & Regulating Transformers and Guide for Short-Circuit Testing of Distribution & Power Transformers General Requirements and Test Procedure for Outdoor Apparatus Bushings Standard Performance Characteristics & Dimensions for Outdoor Apparatus Bushings Guide for Loading Mineral-oil-immersed Power Transformers up to and including 100 MVA with 55C or 65C Average Winding Rise
ANSI C57.12.70-1993 ANSIIIEEE C57.12.90-1993 ANSllIEEE C57.19.00-1992 ANSI/IEEE C57.19.01-1992 ANSllIEEE C57.92-1992
The NEMA Standards TR 1-0.01 through TR 1-0.09 on the following pages (sec Part 0 Pages 1-9) also apply generally to transformers. 0.01 PREFERRED VOLTAGE RATINGS 0.02 FORCED-AIR (FA) (FOA) RATINGS AND FORCED-OIL
Preferred system voltages and corresponding transformer voltage ratings are given in the American National Standard for Electric Power Systems and Equipmeat-Voltage Ratings (60 Hz), C84.1-1989. It is recommended that these ratings be used as a guide in the purchase and operation of transformers.
Under the conditions of par. 5.11 of American National Standard ANSI/IEEE C57.12.00-1988, the relationship between self-cooled ratings and forced-aircooled or forced-oil-cooled ratings shall be in accordance with Table 0-1.
Table 0-1 AND FORCED-OIL RATINGS RELATIONSHIPS
Percen t of Sci f-Cooled Ratings Second Stage Ratings" (k V A) With Auxiliary First Stage Cooling
OA/FA OA/FA OA/FA
501-2499 2500-9999 10000 and above 10000 and above 10000 and above 10000 and above
transformers or autotransformers,
501-2499 2500-11999 12000 and above 12000 and above 12000 and above 12000 and above
115 125 133-1/3 133-1/3 133-1/3 133-1/3
OAIFAIFA
OA/FA/FOA OA/FOA/FOA
·In the case of multi-winding
166-2/3
166-2/3 166-2/3
the ratings given are the equivalent two-winding
TR 1-1993 Page 2
0.03 RADIO INFLUENCE VOLTAGE LEVELS The following values apply to liquid-filled transformers. They do not apply to load tap changing during switching or to operation of auxiliary relays and control switches. 0.03.1 Distribution Transformers Radio influence voltage levels for distribution transformers, for systems rated 69 kV and less, shall not exceed 100 microvolts when measured in accordance with Section 7.01. The test voltage shall be the line-toneutral voltage corresponding to 110 percent excitation of the transformer. This will be the coil voltage for wye connections and 1/3 times the coil voltage for delta connections. 0.04 POWER FACTOR OF INSULATION OIL-IMMERSED TRANSFORMERS OF probable condition of the insulation. It is not feasible to establish standard power-factor values for oil-immersed transformers because: a. Experience has definitely proved that little or no relation exists between power factor and the ability of the transformer to withstand the prescribed dielectric tests. b. Experience has definitely proved that the variation in power factor with temperature is substantial and erratic so that no single correction curve will fit all cases. When a factory power-factor measurement of a transformer is required, the measurement should be made with the insulation at room temperature, preferably at or close to 20°C. 0.05 AUDIBLE SOUND LEVELS Transformers shall be so designed that the average sound level will not exceed the values given in Tables 0-2 through 0-4 when measured at the factory in accordance with the conditions outlined in ANSI/IEEE C57.12.90-1993. The guaranteed sound levels should continue to be per Tables 0-2 through 0-4 until such Lime as enough data on measured noise power levels becomes available. Sound pressure levels are established and published in this document. Sound power may be calculated from sound pressure, using the method described in C57.12.90-1993. Rectifier, railway, furnace, grounding, mobile and mobile unit substation transformers are not covered by the tables. The tables do not apply during the time that power switches arc operating in load-tap-changing transformers and in transformers with integral power switches.
While the real significance which can be attached to the power factor of oil-immersed transformers is still a matter of opinion, experience has shown that power factor is helpful in assessing the probable conditions of the insulation when good judgement is used. The proper interpretation of power factor of oil-imrnersed transformers is being given careful attention by manufacturers in connection with the problems of (1) selecting insulating materials, (2) sealing, and (3) processing the transformers. However, it is the comparative values which are guides for the successful solution for these problems rather than an absolute value of power factor. The generally accepted factory tests for proving the insulation level are the prescribed low-frequency tests and impulse tests given in the American National Standard C57.12.90-1993. When required, a factory power-factor test can be made, and this measurement will be of value for comparison with field power-factor measurements to assess the
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TR 1-1993 Page 4
Table 0-3 AUDIBLE SOUND LEVELS FOR LIQUID-IMMERSED DISTRIBUTION TRANSFORMERS AND NElWORK TRANSFORMERS
Equivalent Two-wind ing kVA A verage Sound Level, Decibels
0-50 51-100 101-300 301-500 750 1000 1500 2000 2500
48 51 55 56 57 58 60 61 62
Table 0-4 SOUND LEVELS FOR DRY-TYPE TRANSFORMERS NOMINAL SYSTEM VOLTAGE AND BELOW
Average Self-cooled Ventilated= Sound Level, Decibels Self-cooled Scaled= Equivalent Two-winding kVA
1S000-VOLT
A verage Sound
Equivalent Two-Winding kVA
Level, Decibels VentUatcd Forced Air Cooled
0-50 51-150 151-300 301-500 501-700 701-1000 1001-1500 1501-2000 2001-3000 3001-4000 4001-5000 5001-6000 6001-7500
'" Class AA rating .... Does not apply to sealed-type tClass FA and AFA ratings
50 55 58 60 62
65 66 68 70 71
65 66 68 69 70 71
3-300 301-500 501-833 834-1167 1168-1667 1668-2000 2001-3333 3334-5000 5001-{)667 6668-8333 8334-10000
67 67 67 67 68 69 71 73 74 75 76
Part 1 POWER TRANSFORMERS
The American National Standard C57.12.IO-1988 has been approved as a NEMA Standard for power transformers and should be inserted in this Part 1. The ANSIJIEEE Standard C57.92-1992, has been approved by NEMA and should be inserted in this Part 1. The following other parts of this NEMA Publication No. TR 1 shall also apply: a. Part 1 b. Part 6 c. Part 7 d. Part 12 General Tenninology Test Code Underground-Type Three-Phase Distribution Transformer
TR 1-1993 Page 7
Part 2 DISTRIBUTION TRANSFORMERS
The following American National Standards have been approved as NEMA Standards for distribution transformers and should be inserted in this Part 2: ANSI CS7.12.20-1988
Requirements for Overhead-Type Distribution Transformers, 500 kVA and Smaller: High Voltage, 34500 Volts and Below; Low Voltage, 7970113800Y Volts and Below Requirements for Pad-Mounted, Compartmental-Type, Self-Cooled, Single-Phase Distribution Transformers with High-Voltage Bushings; (High-Voltage, 34500 GrdYI19920 Volts and Below; Low-Voltage, 2401120 Volts; 167 kVA and Smaller) Requirements for Pad-Mounted, Compartmental-Type, Self-Cooled, Three-Phase Distribution Transformers with High-Voltage Bushings 2500 kVA and Smaller; High-Voltage, 34500 Grd Y119920 Volts and Below; Low Voltage, 480 Volts and Below Requirements for Underground-Type Self-Cooled Single-Phase Distribution Transformers, with Separable Insulated High-Yoltage Connectors; High-Voltage 24940 Grd YI14400 Volts and Below; Low-Voltage 2401120; 167 kVA and Smaller Requirements Distribution High-Voltage 167 kVA and for Pad-Mounted, Compartmental-Type, Self-Cooled, Single-Phase Transformers with Separable Insulated High-Voltage Connectors: 34500 Grd Y119920 Volts and below: Low-Voltage 2401120 Volts; Smaller
ANSI CS7.12.21-1980
ANSI CS7.12.22-1989
ANSI CS7.12.23-1992
ANSI CS7.12.2S-1990
ANSI CS7.12.26-1987
Pad-Mounted Compartmental-Type Self-Cooled, Three-Phase Distribution Transformers for use with Separable High-Voltage Connectors (High-Yoltage 34500 Grd YI19920 Volts and Below: 2500 kVA and Smaller) Guide for Loading Mineral Oil-Immersed Overhead-type Distribution Transformers with 55C or 65C Average Winding Rise
ANSI CS7.91-1992
The following parts of this NEMA Publication No. TR 1 shall apply for distribution transformers: Part 0 General Part 6 Terminology Part 7 Test Code Part 12 Underground-type Three-Phase Distribution Transformers 2.01 DESIGN TEST FOR ENCLOSURE SECURITY OF PADMOUNTED
COMPARTMENTAL TRANSFORMERS
This standard provides a means for evaluating the security of enclosures for transformers conforming to the following American National Standards. ANSI CS7.12.21-1980
Requirements for Pad-Mounted, Compartmental-Type, Self-Cooled, Single-Phase Distribution Transformers with II igh- Voltage Bushings; H igh- Voltage, 34500 Grd YI19920 Volts and Below; Low-Voltage. 2401120 Volts; 167 kVA and Smaller Requirements for Pad-Mounted. Compartmental-Type. Self-Cooled. Three-Phase Distribution Transformers with High-Voltage Bushings 2500 kVA and smaller; High-Voltage,34500 Grd YI19920 Volts and Below; Low Voltage 480 Volts and Below Requirements Distribution High-Voltage 167 kVA and for Pad-Mounted, Compartmental-Type. Self-Cooled, Single-Phase Transformers with Separable Insulated High-Voltage Connectors: 34500 Grd YI19920 Volts and below: Low-Voltage 2401120 Volts; Smaller .
TR 1-1993 Page 8
ANSI C57.12.26-1987
Pad-Mounted Compartmental-Type Self-Cooled, Three-Phase Distribution Transformers for use with Separable High-Voltage Connectors (High-Voltage 34500 Grd Yl19920 Volts and Below: 2500 kVA and Smaller)
TR 1-1993 Page 9
Part 3 NETWORK TRANSFORMERS
The following other parts of this NEMA Publication No. TR I shall also apply for secondary network transformers: a. Part 0 b. Part 6 c. Part 7 General Terminology Test Code
The American National Standard Requirements for Secondary Network Transformers, Subway and Vault Types (Liquid Immersed), C57.12.40-1990, (with the exception of paragraphs 5.5.4 and 11.5.2 on finishes) have been approved as NEMA Standards for secondary network transformers and should be inserted in this Part 3.
TR 1-1993 Page 10
TR 1-1993 Page 11
Part 4 DRY· TYPE TRANSFORMERS
The following American National Standards have been approved as NEMA Standards for dry-type transformers and should be inserted in this Part 4: ANSI/IEEE C57.12.01-1989 ANSI/IEEE C57.12.91-1979 ANSI C57.12.50-1989 General Requirements for Dry-type Distribution and Power Transformers Test Codefor Dry-Type Distribution and Power Transformers Requirements for Ventilated Dry-Type Distribution Transformers, 1 to 500 kVA, Single-Phase; and 15 to 500 kVA, Three-Phase; With High-Voltage 601-34500 Volts, Low-Voltage 120-600 Volts Requirements for Ventilated Dry-Type Power Transformers, 501 kVA and Larger, Three-Phase With High-Yoltage 601-34500 Volts, Low-Voltage 208Y/120-4160 Volts Requirements for Sealed Dry-Type Power Transformers, 501 kVA and Larger, Three-Phase, With High-Voltage 601-34500 Volts, Low-Voltage 208Y/120-4160 Volts Recommended Practicesfor Installation, Application. Operation and Maintenance of Dry-Type General Purpose Distribution and Power Transformers Guide for Loading Dry-Type Transformers, Appendix to C57.12 Standards
ANSI C57.12.51-1989
ANSI C57.12.52-1989
ANSI/IEEE C57.94-1982 ANSI/IEEE C57.96-1989
TR 1-1993 Page 12
TR 1-1993 Page 13
Part 5 UNIT SUBSTATION TRANSFORMERS
The following other parts of this NEMA Publication No. TR 1 shall also apply for unit substation transformers, a Part 0 General b. Part 6 Terminology c. Part 7 Test Code
TR 1-1993 . Page-14
TR 1-1993 Page 15
Part 6 TERMINOLOGY
The ANSI/IEEE Standard C57.12.80-1992, inserted in this Part 6. has been approved as a NEMA Standard for terminology and should be
TR 1-1993 Page 16
.f":.
TR 1-1993 Page 17
Part 7 TEST CODE
The American National Standard ANSI/IEEE CS7.12.90-1987, has been approved as a NEMA Standard for transformer tests and should be inserted in this Part 7. This NEMA standard, Part 7, shall also apply for transformer tests. The ANSI/IEEE Standard C57.98-1992, inserted in this Part 7. should be e. One term inal of each winding not under test, the ground terminal if one is available, shall be connected to the tank and ground. d. Connections for testingClass A-2 Apparatus The test voltage shall be applied to the winding under test, with all terminals of the winding under test tied together (see Fig. 7-3). Use of bushing capacitance tap If radio influence voltage is measured at the capacitance tap of the bushing, a suitable device shall be used which can be tuned with the bushing tap to ground capacitance at the measuring frequency. This device shall constitute all circuit elements from the capacitance tap of the bushing to the radio noise meter. The coaxial cable, an element of the device, may be any suitable impedance and need not be terminated in its characteristic impedance. The purpose of the device is to minimize the dividing effect of the bushing capacitance and to convey the radio influence voltage to the radio noise meter with minimum attenuation. See Fig. 7-4 and 7-5. f. Calibration for circuits using bushing capacitance tap The calibration ratio will be determined by: 1. Applying to the terminal under test the output of a sine-wave signal generator at approximately 100 microvolts and at the measuring frequency, or that of a pulse signal generator at approximately 100 microvolts. 2. Measuring the voltage on the terminal with the radio noise meter connected directly to the terminal. 3. Measuring, with the same radio noise meter, the voltage appearing in the test circuit at the location where the radio noise meter will be connected during the radio influence voltage measurement on the transformer (a second radio noise meter shall be permitted to be used instead, provided its relationship to the first radio noise meter has been established). It shall be established that this calibration ratio remains valid over the radio influence voltage range of interest. The ratio of the voltage measured with the radio noise meter at the terminal to the voltage measured with the radio noise meter at the normal location in the circuit 4.
7.01 TEST CODE FOR MEASUREMENT OF RADIO INFLUENCE VOLTAGE LEVELS
The apparatus to be tested under this code can be divided into two general classes as follows: Class 1-Potential-type transformer apparatus, such as transformers for step-up, stepdown or interconnected service, and some arrangements of regulating transformers and autotransformers. Class 2- Series-type transformer apparatus, such as series transformers, shunt (iron core) reactors, current-limiting reactors and some arrangements of regulating transformers and autotransformers. b. Equipment The equipment and general method used in determining the radio influence voltage shall be in accordance with the NEMA Standards Publication Methods of Measurement of Radio Influence Voltage (RIV) of High-voltage Apparatus, 107-1964 (R-1971, 1976, R-1992). For an alternate method, see par. E, Use of Bushing Capacitance Tap. c. Connections for testing-Class A-I Apparatus The test voltage shall preferably be impressed across the winding under test (see Fig. 7-1). It may, however, be induced from a winding other than that being tested (see Fig. 7-2). In order that the results be comparable, the circuit arrangements and constants must be as shown in Fig. 7-1 or 7-2. The winding shall be tested first with one end grounded and then with the other end grounded. The test on a reduced-voltage neutral terminal shall correspond to the insulation class of the neutral. Windings with one end solidly grounded obviously will receive no test on the grounded end.
TR 1-1993 Page 18
which has been selected for the corona test on the transformer will be applied as a correction factor to the radio influence voltage reading obtained during the corona test to determine the actual radio influence voltage at the terminal of the winding under test. g. Test voltage The test voltage shall be determined from the preferred nominal system voltage in accordance with 0.04 in Part 0, except that the test voltage shall not exceed 110 percent of the rated voltage of the winding on the highest tap connection.
h. Precautions in making tests The following precautions should be observed in measuring the radio influence voltage. The apparatus should be: I. Tested at approximately the same temperature as the room in which the tests are made 2. Located as to provide the outside clearances recommended.
TR 1-1993 Page 19
Fig. 7-1 *
Fig. 7-2*
C A A -Transformer under test B -Testing transformer C -Coupling capacitor NM-Radio noise meter R. -Terminating resistance Z -Radio frequency choke
• Values for radio circuit clements and detailed connections shall conform to the l\'EMA Standards Publication M ethods of M easuremeni of Radio Influence Voltage (R IV) of High- voltage Apparatus, 107-1964 (R 1971, 1976, R 1992).
Fig. 7-3*
TEST CIRCUITS FOR RADIO INFLUENCE MEASUREMENTS USING THE BUSHING CAPACITANCE TAP:
C, CABLE
NM A C2
A -Transformer under test B -Testing transformer C,-High-voltage bushing capacitance C2-High·voltage bushing capacitance tap
CABLE-Shielded cable Z, -Variable inductance R2 -Resistor NM -Radio noise meter
7.02 TRANSFORMER TEST REPORT
To facilitate safe and effective operation of transformers it is recommended that the following information be included in the test report:
Manufacturer's Name Purchaser Date of Test Cooling Class Volts Winding (1) { Taps Purchaser's Order No. Phase _ Hertz kVA (2) Mfr.'s Ref. No. _-Insulating Fluid Volts kVA (3) _ _ _ _ Volts kVA ___
RESISTANCE, EXCITING CURRENT, LOSSES AND IMPEDANCE-Based on normal rating unless otherwise stated. Losses and regulation are based on wattmeter measurements. For three-phase transformers the resistances given are the sum of the three phases in series. Resistance in Ohms at 8S·C Serial No. (1)
Watts Loss and Impedance at 8S·C
at 100% Voltage
No Load Loss In Watts 100% Voltage
to Load Loss
V to V kVA %Imp. Load Loss
V to V kVA %Imp_ Load Loss
kVA %Imp.
Total Loss Average Guarantee TEMPERATURE RISES are in degrees C corrected to instant shutdown. Serial No
,~"-.,
with windings connected and loaded as follows:
Multi-winding transformer heat run connections for the determination of the maximum winding rises over ambient may not be the same as that for the maximum losses which produce the maximum fluid rise. Such temperature rise entries shall be on separate lines in the Temperature Rise table of the Test Report Form. Precautions should be taken to assure that the fluid temperature rise and winding rises entered on a common line correspond to the same test conditions. Temp. Rise Cool Guar. ·C Mode Fluid R. Above Amb. Losses Dissipated Top ·C Ave. ·C Winding Differential Above Average Fluid Energized Winding Shorted Winding Tap-kV Amps Tap-kV Amps Rise by Res. ·C (1)
DIELECTRICTESTS-If
Impulse Tests are required, see separate Transformer Impulse Test Report. Voltage Rating of Winding Tested Test Voltage Applied Duration of Test in Seconds
APPLIEDPOTENTIALTESTS Voltage applied between each winding and all other windings connected to core and ground.
INDUCED POTENTIAL TESTS REMARKS:
hertz for cycles
times rated voltage across full winding kV from kV line terminal to ground
I hereby certify this is a true report based on factory tests made in accordance with the Transformer Test Code C57.12.90 current edition of the American National Standards Institute, and that each Transformer withstood the above insulation tests. Signed Date Approved by _ Transformer Engineering Dept. Authorized Engineering Information 11-20-1980.
TR 1-1993 Page 21 7.03 TRANSFORMER IMPULSE TEST REPORT To facilitate safe and effective operation of transformers it is recommended that the following information be included in the test report:
Manufacturer'S Purchaser Date of Test Type H-winding Phase Volts Name _ __ Purchaser's Order No. _ X-winding
Mfr.'s References Insulating Fluid _
Cycles Volts
V-winding
Tenninel
kV Required
kV Applied
Microsecond to Crest
Microsecond to Flashover
-RFW-Reduced REMARKS:
·CW-Chopped
·FW-Full
Approved Transformer Engineering
_ Dept
TR 1-1993 Page 22 7.04 REACTOR TEST REPORT To facilitate safe and effective operation of transformers it is recommended that the following information be included in the test report;
Manufacturer's Name Purchaser Date of Tests Type Volts Drop _ Purchaser'S Order No. Phase _ Cycles _ kVA _ Mfr.'s Ref. No. Insulating Fluid Amperes _ ___ _ _ _
For connection in Volt Circuit RESISTANCES, LOSSES AND IMPEDANCE are based on normal rating, unless otherwise stated. wattmeter measurements. Serial No. Resistance at 85·C Phase A Phase B Phase C Total Loss Watts 85·C
Losses are based on
Impedance Volts
Average Guarantee TEMPERATURE RISE in degrees C corrected to instant of shutdown. Serial No. Amperes Rise by Resistance Guarantee
.•~~ ...:
INSULATION TESTS-high-potential tests were made on each reactor. Voltage was applied between winding and ground and between phases of a polyphase reactor. Voltage at high frequency was induced in each winding to test the turn-toturn strength. Voltage Rating of Winding Applied Voltage at Normal Frequency Induced Voltage at High Frequency
Part 8 AND DISTRIBUTION
The ANSI!IEEE Standard C57.15-1992, has been approved as NEMA Standards for transmission and distribution voltage regulators and should be inserted in this Pan 8.
The ANSllIEEE Stanard C57.95-1992. Appendix to C57.15, has been approved as NEMA Standard for Transmission and distribution voltage regulators and should be inserted in this Pan 8.
TR 1-1993 Page 25
Part 9 CURRENT-LIMITING REACTORS [To Be Published]
TR 1-1993 Page 26
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TR 1-1993 Page 27
The following other parts of this NEMA Publication No. TR 1 shall also apply for arc furnace transformers: a Part 0 General h. Part 6 Terminology c. Part 7 Test Code
TR 1-1993 Page 28
TR 1-1993 Page 29
Part 11 SHUNT REACTORS
The American National Standard, CS7.2I-I991, has been approved by NEMA and should be inserted in this Part 11.
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