Biddle 550503_UG 电路图.pdf

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1、AVTM550503 Rev E March 2005 Instruction Manual AVTM550503 for Three-Phase TTR Transformer Turn Ratio Test Set Catalog No. 550503 High-Voltage Equipment Read the entire manual before operating. Aparato de Alto Voltaje Antes de operar este producto lea este manual enteramente. M Valley Forge Corporate

2、 Center 2621 Van Buren Avenue Norristown, PA 19403 U.S.A. 610-676-8500 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 Three-Phase TTR Transformer Turn Ratio Test Set Instruction Manual RadioFans.CN 收音机爱 好者资料库 Copyright Notice Copyright 1999 by Megger. All rights reserved. Disclaimer Notice The info

3、rmation contained in this manual is believed to be adequate for the intended use of the product. If the product or its individual instrument are used for purposes other than those specified herein, confirmation of their validity and suitability must be obtained from Megger. Refer to the warranty inf

4、ormation included at the end of this instruction manual. Specifications are subject to change without notice. Warranty Products supplied by Megger are warranted against defects in material and workmanship for a period of one year following shipment. Our liability is specifically limited to replacing

5、 or repairing, at our option, defective equipment. Equipment returned to the factory must be shipped prepaid and insured. This warranty does not include batteries, lamps, or other expendable items, where the original manufacturers warranty shall apply. We make no other warranty. The warranty is void

6、 in the event of abuse (failure to follow recommended operating procedures) or failure by the customer to perform specific maintenance as indicated in this manual. TABLE OF CONTENTS INTRODUCTION.1 Receiving Instructions.1 General Information.1 SAFETY.3 SPECIFICATIONS.7 Electrical.7 Environmental Con

7、ditions.9 Physical Data.10 Accessories Supplied.10 Optional Accessories.11 DESCRIPTION.13 Principle of Operation.13 TTR Operational Flow Chart.15 Controls, Indicators, and Connectors.19 SETUP AND CONNECTIONS.21 General Instructions.21 Single-Phase, Two-Winding Transformers.21 Three-Phase, Two-Windin

8、g Transformers.24 Three-Phase, Three-Winding Transformers.25 Current Transformers (CTs).26 T-Type Transformers.32 Connections and Vector Voltage Diagrams.33 OPERATION.65 General Operating Procedure.65 Description of Menus and Test Screens.65 Error Messages.85 AVTM550503 Rev E March 2005 ii Remote Co

9、ntrol Operation for LTC Testing.86 Use with the Optional Printer.87 Use with the Optional Inverter.88 COMLINK.91 Introduction.91 Installation and the X terminals on the test set must be connected to the H terminals on the CT. NOTE: Dots on the housing of the transformer are commonly used to identify

10、 terminals of the same polarity. WARNING Failure to observe proper connections will result in a safety hazard and may result in damage to the test set or CT. Failure to observe voltage rating of low- current X winding may result in damage to the CT. CAUTION Never use AUTO mode of operation when test

11、ing the current transformers with the rated voltage below 80 V ac. Most of the CTs are tested at 8 V ac excitation voltage. NOTE: Most of the current transformers are tested at 8 V ac excitation voltage. Some current transformers with turn ratio of 100:5 and less get saturated at 8V ac. They require

12、 lower excitation voltage for testing and therefore can not be tested with the Cat.No 550503 TTR. SETUP AND CONNECTIONS AVTM550503 Rev E March 2005 27 Unmounted CTs 1. Connect the wing-nut ground terminal of the test set to a low-impedance earth ground using the 15-ft (4.6 m) ground cable supplied.

13、2. Use the TTR H and X test leads and connect as follows and as shown in Figure 5-5. 3. Connect the heavy-duty clips marked H1 and H2 of the test lead to the respective X1 and X2 terminals of the CT. 4. Connect the heavy-duty clips marked X1 and X2 of the test lead to the respective H1 and H2 termin

14、als of the CT. Ensure correct polarity. Figure 5-6 shows the setup for testing the taps on a multiple-tap CT. Bushing Current Transformer (BCT) Mounted on Single-Phase, Two-Winding Transformer A turn-ratio test can be performed on a BCT after it has been mounted on a circuit breaker or power transfo

15、rmer entrance bushing. The test can be performed without removal of the BCT from the equipment. Proceed as follows and as shown in Figure 5-7. 1. Connect the wing-nut ground terminal of the test set to a low-impedance earth ground using the 15-ft (4.6 m) ground cable supplied. 2. Use the TTR two or

16、four conductor H and X test leads. 3. Short-circuit the winding on the opposite voltage side of the power transformer core, using jumper leads. 4. Connect the heavy-duty clips marked H1 and H2 of the test leads to the respective X1 and X2 terminals of the BCT. 5. Connect the heavy-duty clip marked X

17、1 to the power transformer terminal on which the BCT is mounted and the X2 heavy-duty clip to the terminal on the opposite side of the power transformer winding (H2 side of BCT). Check to make sure that the BCT is mounted with proper polarity with respect to power transformer entrance bushing and th

18、at connection polarities are correct. M AVTM550503 Rev E March 2005 28 Figure 5-5. Setup for Testing Unmounted Current Transformer Figure 5-6. Setup for Testing Taps on Multiple Tap CT SETUP AND CONNECTIONS AVTM550503 Rev E March 2005 29 Figure 5-7. Setup for Testing BCT Mounted on Single-Phase Two-

19、Winding Transformer BCTs Mounted on Three-Phase Transformers A turn-ratio test can be performed on all three BCTs using a single setup. Figure 5-8 shows how to make the proper connections when the BCTs are mounted on a typical delta winding and Figure 5-9 when mounted on a typical wye winding. 1. Us

20、e four conductor H and X test leads. 2. Short-circuit all windings on the opposite voltage side of the power transformer core using jumper leads. 3. Check to make sure that all BCTs are mounted with proper polarity with respect to the power transformer entrance bushing. Ensure that all connection po

21、larities are correct. M AVTM550503 Rev E March 2005 30 Figure 5-8. Setup for Testing BCT Mounted on Delta Winding on a Three-Phase Power Transformer SETUP AND CONNECTIONS AVTM550503 Rev E March 2005 31 Figure 5-9. Setup for Testing BCT Mounted on Wye Winding of a Three-Phase Transformer M AVTM550503

22、 Rev E March 2005 32 T-Type Transformers T-type transformers represent the special type of thee-phase transformers. This transformer may be tested as a single phase transformer. In this case, the jumpers indicated in Table 5-3 should be applied to the appropriate terminals of the T-type transformers

23、. The TTR measured turn ratio should be compared to the calculated turn ratio indicated in Table 5-3. Table 5-3. T-type Transformer Winding Phase Relationship Winding Connection Winding Tested IEC Vector Group High-Voltage Winding (H) Low-Voltage Winding (X) External jumpers Phase tested High- Volta

24、ge Winding Low- Voltage Winding Calculated Turn Ratio Remarks T-T 0 - H1 -H2 X1 -X2 A B H1 - H2 H1 H3 X1 - X2 X1 X3 V V H X V V H X T-T 30 lag H2 -H3 X1 -X2 A B H1 H3 H2 H3 X1 - X2 X1 X3 V V H X 3 2 T-T 30 lead H2 -H3 X1 X3 A B H1 H3 H2 H3 X1 X3 X2 X1 2 3 V V X H NOTE: When testing T-type transforme

25、r, the diagram number 1 should be entered at the Quick Test Setup screen (See Figure 6-3) or at the Full Test Setup 1 screen (See Figure 6-6). 3 2 V V X H 3 2 V V X H SETUP AND CONNECTIONS AVTM550503 Rev E March 2005 33 Connections and Vector Voltage Diagrams When testing three-phase transformers, i

26、t is necessary to understand the phase relationships, vector diagrams, and winding connection diagrams for these transformers. A detailed description of phase relationships, vector diagrams, and terminal markings is contained in specification ANSI C57.12.70 1978, American National Standard Terminal

27、Markings and Connections for Distribution and Power Transformers. Refer to specification CEI/IEC 76-1:1993 and Publication 616:1978 for International Standard terminal and tapping markings for power transformers. Refer to specification AS-2374, Part 4-1982 for Australian standard tappings and connec

28、tions for power transformers. Table 5-4 shows winding diagrams for standard transformers and nonstandard transformers for power and distribution transformers marked in accordance with the ANSI standard. Table 5-5 shows winding diagrams for power transformers marked in accordance with the CEI/IEC sta

29、ndard, and Table 5-6 shows winding diagrams for power transformers marked in accordance with the Australian standard. To make a measurement on a three-phase power transformer, match the vector diagram from the transformer nameplate to the corresponding winding connection diagram from Table 5-4 throu

30、gh 5-6, then enter the corresponding diagram number (column 1 of table) in the appropriate setup menu of the instrument. The tables show the windings tested for each of the three phases. The tables also show the relationship between the measured turn ratio and the actual line-to-line voltage ratio.

31、For the ANSI specification, the rated voltage on the high-voltage winding is represented by VH; VX represents rated voltage on the low-voltage winding. The TTR is also capable of measuring the turn ratio on three-phase transformers with an inaccessible neutral point. In this case, the TTR automatica

32、lly shorts an appropriate transformer winding, listed in the winding shorted column of the table. An inaccessible neutral point on the high-voltage or low-voltage transformer winding is designated by the symbol *. For many utilities, different manufacturer nameplate diagrams make it impossible to al

33、ways find a corresponding diagram on Tables 5-4 to 5-6. To help determine the correct connection and to test any transformer, the following explanation will help self-check your work. Figure 5-10 (a) shows the relationship in a typical delta-wye connected transformer with accessible neutral connecti

34、on point. The delta winding is the high-voltage winding and the terminals are marked H1, H2, and H3. The wye winding is the low-voltage winding and the terminals are marked X0, X1, X2, and X3. Determine which windings (lines) are parallel to each other. In the diagram, winding M AVTM550503 Rev E Mar

35、ch 2005 34 H1 H3 is parallel to X1 X0 as illustrated by the two solid straight arrows. Only H1 H3 will ratio against X1 X0. Also H2 H1 is parallel to X2 X0, and H3 H2 is parallel to X3 X0. All ratio measurements are made between parallel windings. The phase polarity must also be observed and is designated by the or