Transformer Turns Ratio Test Sets

Document Sample
Transformer Turns Ratio Test Sets Powered By Docstoc
					                                                                                                     TRANSFORMER TEST EQUIPMENT

                                                                                                                                        1
                                                                                                             ®
                                                                                              BIDDLE
                                                                                                      ®
                                                                                              TTR                                       2

                                                                                              Three-Phase Model
                                                                                                                                        3
                                                                                              • Microprocessor controlled,
                                                                                                automatic balancing
                                                                                                                                        4
                                                                                              • Reduces testing time
                                                                                                by 50%
                                                                                                                                        5
                                                                                              • Expanded ratio range
                                                                                                of 2700:1
                                                                                                                                        6
                                                                                              • Printer option

                                                                                              • Eliminates the need for                 7
                                                                                                manual setup changes
                                                                                                                                        8


Transformer Turns Ratio Test Sets                                                                                                       9

                                                                                                                                        10
DESCRIPTION                                   The TTR set operates on the principle that   for data transfer or for use with the
Biddle® TTR® Transformer Turns Ratio          the voltage ratio of the transformer at      optional lid-mounted printer.
Test Sets measure the turns ratio and         no load is practically equal to the true     • Single-phase models: These models
                                              turns ratio.                                                                              11
exciting current of windings in power,                                                     are primarily used for testing
potential and current transformers.           The major source of error in a transformer   single-phase power and distribution
Deviations in turns ratio readings            is a primary impedance drop due to           transformers, for low-ratio readings up
indicate problems in one or both                                                                                                        12
                                              magnetizing current, which is kept to a      to 129.99:1, or up to 329.99:1 with an
windings or the magnetic core circuit.        minimum by excitation at a fraction of       auxiliary transformer.
The TTR test sets aid in identifying:         rated voltage. By employing a design
                                              that meets both of these conditions
                                                                                           They also can be used to test three-         13
• Shorted coils                                                                            phase transformers by connecting and
                                              along with the use of a null balance         testing each phase separately.
• Open circuits                               system, the turns ratio of a transformer
                                              can be determined accurately.                                                             14
• Incorrect connections                                                                    FEATURES AND BENEFITS
• Internal faults or tap-changer              When measuring the turns ratio of
                                              distribution and power transformers,         Three-Phase Model
defects in step regulators as well as in                                                   • Microprocessor-based control               15
transformers.                                 the accuracy is well within 0.1%.
                                                                                           provides fully automatic operation.
The three-phase model is a fully automatic,   APPLICATIONS                                 Test function takes less than
microprocessor-based system with an                                                        10 seconds.                                  16
                                              • Three-phase model: Fully automatic
expanded ratio range of 2700:1 to cover       units are used for testing single- and       • Digital readout displays ratio, exciting
most current and potential transformers       three-phase transformers and voltage         current and self-diagnostic messages
with unmatched accuracy of ±0.1%.             regulators, for high-ratio readings          for simplicity of operation.
                                                                                                                                        17
The automatic operation reduces test          ranging from 0.8:1 to 2700:1.                • Expanded ratio range of 2700:1
function time to under 10 seconds, pro-       An RS-232C interface is provided             covers most current and potential
viding dramatic cost savings to the user.                                                                                               18
                                                                                           transformers.
Additional time saving is gained from the
simple switch settings which eliminate                                                     • The simple switch settings for all
the need for manual setup changes.                                                         combinations of transformer connections      19
                                                                                           eliminate the need for manual setup
An optional printer is available for                                                       changes.
recording testing results.
                                                                                           • 40 volt output voltage selection           20
The model is available in either hand-                                                     allows testing current transformers.
cranked or line-operated versions and
measures highly sensitive turns ratios                                                     • Error messages reduce incorrect
                                                                                           connections and incorrect settings.          21
of up to 129.99:1 with accuracy of
±0.1%. An optional auxilary trans-                                                         • RS-232C interface allows download
former extends the ratio range to                                                          to an optional lid-mounted printer.
329.99:1.
                                                                                                                                        22
                                              This single-phase TTR test set is oper-
                                              ated by turning a crank.



AC-4 AVO-651 07.97
                                                                                                    AVO INTERNATIONAL             2-3
     TRANSFORMER TEST EQUIPMENT

 1   SPECIFICATIONS

                                                 Range                                     Dimensions
                           Power                                                                                                      CAT.
 2         Model
                           Source
                                         Turn       Exciting       Accuracy                                          Weight
                                                                                                                                      NO.
                                         Ratio       Current                                 HxWxD
                                                                                    10 H x 10.5 W x 14.5 D in.        18 lb
 3                      Hand-cranked                0 to 1 A**                      250 H x 260 W x 370 D mm        (8.2 kg)        550005
      Single-phase
        field sets                      0.001 to                                      11 H x 15 W x 29 D in.          26 lb
                            Line*                                                                                                   550027
                                        129.999                      ±0.1%          280 H x 380 W x 737 D mm        (11.8 kg)
 4                                                  0 to 5 A**
                                                                                     10 H x 10.5 W x 19 D in.         22 lb
      Single-phase                                                                                                                  550022
                            Line*                                                   255 H x 267 W x 483 D mm         (10 kg)
      rack mounted
 5    Three-phase                       0.800 to      0 to                           12.5 H x 12 W x 20 D in.         36 lb
                            Line*                                                                                                   550100***
       automatic                          2700      1999 mA                         320 H x 300 W x 510 D mm        (16.5 kg)

       *   120 Vac, 50/60 Hz. To order 240 Vac, 50/60 Hz, add –47 to Cat. No.
 6    **   Divide by 5 switch for increased resolution
     ***   To order instrument with printer mounted in lid, add –39 to Cat. No.
     ***   To order instrument with printer in lid and 240 Vac, 50/60 Hz, add –39–47 to Cat. No.
 7

     FEATURES AND BENEFITS (cont.)                     • Line-operated model for shop or                Error Messages Indicate
 8                                                     field testing is packaged in a rugged,              Exciting current overloads
     Single-Phase Models                               wooden case.                                        Incorrect polarity
     • Available in hand-cranked or line-                                                                  Incorrect lead connections
                                                       • Measures highly sensitive turn
 9   operated models, these units provide
                                                       ratios up to 129.99:1. An optional
                                                                                                           Internal out-of-calibration
     unmatched accuracy (±0.1%) in a                                                                       Ratio values beyond instrument range
     portable design.                                  auxiliary transformer extends this
                                                       ratio range to 329.99:1.                         Single-Phase Models
10   • Rack-mounted model is suitable for
     routine production testing by transformer                                                          Output
                                                       SPECIFICATIONS
     manufacturers or repair shops. This                                                                   8 V, 50/60 Hz
11   unit is line-operated.                            Three-Phase Model
                                                                                                           Line-operated models supply up
                                                       Output
                                                                                                           to 5 A for testing specialty power
                                                           • 120 volt, 50/60 Hz standard test for          transformers having a high ratio and
12                                                           power and distribution transformers           a low secondary voltage.
                                                           • 40 V, 50/60 Hz for current transformers    Metering: Four decade dials
13                                                         Selector switches provide automatic
                                                                                                        OPTIONAL ACCESSORIES
                                                           selection of transformer winding
                                                           type and phase under test.                   Thermal printer and protective interlocks
14                                                                                                      are available for use with the three-
                                                       Metering
                                                                                                        phase TTR test set.
     The instrument displays error messages              Turns Ratio: 5-digit LCD
     if test connections are incorrect.                  Exciting Current: 31/2-digit LCD               Printer
15                                                                                                      Test results can be documented with a
                                                                                                        thermal printer.
16                                                                                                      A header can be printed that provides
                                                                                                        spaces to record the TTR serial number,
                                                                                                        test date, operator name, transformer
                                                                                                        information, temperature, test voltage,
17                                                                                                      relative humidity and comments/notes.
                                                                                                        The header automatically includes the
18                                                                                                      type of transformer (single- or three-


19

20

21

22
     Select the transformer winding type and phase under test, press a button, and ratios               An optional printer provides hard-copy
     are displayed automatically.                                                                       documentation.



     2-4       AVO INTERNATIONAL                                                                                                    AC-4 AVO-651 07.97
                                                                                                                               TRANSFORMER TEST EQUIPMENT

                                                          A space is included for the transformer                 to the TTR set and the transformer                         1
                                                          tap number.                                             under test.
                                                          Protective Interlocks                                   Dimensions
                                                                                                                    8 H x 13 W x 10 D in.                                    2
                                                          An interlock shorting plug is supplied                    203 H x 330 W x 254 D mm
                                                          with the test set. Both a foot-switch and
                                                          a hand switch interlock are available                   Weight: 13 lb (5.9 kg)
                                                          as optional accessories.
                                                                                                                                                                             3
                                                                                                                  Calibration Reference
                                                          Auxiliary Transformer                                   Transformer
                                                          An auxiliary transformer extends the                    Calibration reference transformers                         4
                                                          ratio range of single-phase models to                   are available for both single- and
                                                          329.99:1. Turns ratio is 100:1 and 200:1,               three-phase test sets. They provide a
                                                          and is accurate to within ±0.1%.                        reference standard for periodic cali-                      5
                                                                                                                  bration checks to document proof of
                                                          The auxiliary transformer includes all
                                                                                                                  calibration.
                                                          the necessary cables for connection
                                                                                                                  A Calibration Certificate of Turn                          6
                                                                                                                  Ratio Accuracy traceable to the NIST
                                                                                                                  is furnished with each calibration
Auxiliary transformer for single-phase TTR                                                                        reference transformer, providing                           7
                                                                                                                  accuracies of ±0.05%.
phase) and the configuration of the                                                                               Dimensions (single- and three-
high- and low-voltage windings.                                                                                   phase)                                                     8
The three-phase TTR automatically                                                                                     8 H x 14 W x 10 D in.
identifies whether three-phase or                                                                                     203 H x 356 W x 254 D mm
single-phase leads are being used and                                                                                                                                        9
sends the test results to the printer in                                                                          Weight
the proper format.                                                                                                    Single-Phase: 11 lb (5.0 kg) approx
                                                                                                                      Three-Phase: 16 lb (7.3 kg) approx                     10
The test result printout includes
ratio, exciting current and polarity.                     Calibration reference transformer
                                                                                                                                                                             11

                                                                                                                                                                             12
                                                             ORDERING INFORMATION
   Item (Qty)                                                         Cat. No.      Item (Qty)                                                          Cat. No.
   Three-phase automatic TTR, line,                                                 Single-Phase Models                                                                      13
      120 Vac, 50/60 Hz .................................................. 550100     Cable assembly ....................................................... 19494
      240 Vac, 50/60 Hz ............................................. 550100-47         With C-clamps for X (low-voltage) winding,
   Three-phaseTTR with printer, mounted in lid                                            10 ft (3 m) [2]                                                                    14
      120 Vac, 50/60 Hz ............................................. 550100-39         With spring clips for H (high-voltage) winding,
      240 Vac, 50/60 Hz ........................................ 550100-39-47             13 ft (4 m) [2]
   Single-phase TTR, hand-cranked ............................. 550005                  All cables are permanently connected to the test set.                                15
   Single-phase TTR, line, 120 Vac, 50/60 Hz .............. 550027                    Instruction manual ........................................ AVTM55JD
   Single-phase TTR, line, 240 Vac, 50/60 Hz ......... 550027-47                    Optional Accessories
   Single-phase TTR, rack-mounted, line,                                                                                                                                     16
                                                                                    Three-Phase Models
      120 Vac, 50/60 Hz .................................................. 550022     Printer with cable ................................................. 550105
   Single-phase TTR, rack-mounted, line,                                              Case, shipping and storage,
      240 Vac, 50/60 Hz ............................................. 550022-47                                                                                              17
                                                                                        heavy-duty, padded .......................................... 550615
   Included Accessories                                                               Calibration reference transformer ...................... 550055
   Three-Phase Models                                                                 Printer paper [1 roll] ........................................... 27705-1
                                                                                      Carrying case                                                                          18
     Cables
                                                                                        For cables ........................................................ 218744-1
       Power cord, 8 ft (2.5 m) [1] ................................ 17032
                                                                                        Soft pack for TTR .............................................. 246010
       Grounding cord, 15 ft(4.5 m) [1] ...................... 4702-5                                                                                                        19
                                                                                      Extension cable for high- and low-voltage
       With heavy-duty clips for one-phase connections
                                                                                        cables, 15 ft (4.5 m) ........................................... 550110
          to H winding, 10 ft (3 m) [1] ..................... 28549-1H
                                                                                      Foot switch interlock ........................................... 10229-5
          to X winding, 10 ft (3 m) [1] ...................... 28550-1X                                                                                                      20
                                                                                      Hand switch interlock ......................................... 27980-2
       With heavy-duty clips for three-phase connections
                                                                                    Single-Phase Models
          to H winding, 30 ft (9 m) [1] ..................... 28541-1H
          to X winding, 30 ft (9 m) [1] ...................... 28542-1X               Auxiliary transformer, extends the ratio
       Shorting plug for interlock receptacle [1] ....... 28552                         range to 329.99 .................................................. 550030            21
       All cables are supplied in a canvas bag with an                                Calibration reference transformer ...................... 550050
          adjustable shoulder strap. Longer cable lengths
          are also available.                                                       Note:The cables have been designed for use with the                                      22
     Instruction manual ........................................ AVTM55-1J               TTR test sets. Any substitution may cause errors
                                                                                         in reading and may be dangerous to the operator.



AC-4 AVO-651 07.97
                                                                                                                              AVO INTERNATIONAL                        2-5

				
DOCUMENT INFO
Shared By:
Categories:
Tags:
Stats:
views:80
posted:12/18/2011
language:
pages:3