Biddle TTR100_UG 电路图.pdf

AVTMTTR100 Rev. B October 2003 Instruction Manual AVTM TTR100 for Single- Phase Handheld TTR Transformer Turn Ratio Test Set Catalog No. TTR100 High- Voltage Equipment Read the entire manual before operating. Aparato de Alto Voltaje Antes de operar este producto lea este manual enteramente. M 2621 Van Buren Ave Norristown, PA 19403- 2329 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 Single- Phase Handheld TTR Transformer Turn Ratio Test Set Instruction Manual RadioFans.CN 收音机爱 好者资料库 Copyright Notice Copyright 2003 by Megger. All rights reserved. Disclaimer Notice The information 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 information included at the end of this instruction manual. Specifications are subject to change without notice. AVTMTR100 Rev B October 2003 i TABLE OF CONTENTS INTRODUCTION.1 Receiving Instructions.1 General Information.1 SAFETY.5 SPECIFICATIONS.9 Electrical.9 Environmental Conditions.11 Physical Data.12 Accessories Supplied.12 Optional Accessories.12 DESCRIPTION.15 Principle of Operation .15 Controls, Indicators, and Connectors (Figure 4-2).16 SETUP AND CONNECTIONS.19 General Instructions.19 Transformers .19 Single-Phase, Two-Winding Transformers .20 Distribution Transformers with Two Secondary Windings.20 Current Transformers (CTs).23 T-Type Transformers.26 Connections and Vector Voltage Diagrams.27 OPERATION.53 General Operating Procedure.53 Description of Menus and Test Screens.53 Quick Test Single Phase Transformer.59 Quick Test Three Phase Transformer.60 AVTMTR100 Rev B October 2003 ii Quick Test T-Type Transformers.61 Error Messages.70 Use with the Optional Printer.74 SERVICE.81 Maintenance.81 Calibration.81 Battery Maintenance.82 Troubleshooting.83 Repair.84 ORDERING INFORMATION AND SPARE PARTS LIST.85 GLOSSARY.89 WARRANTY.91 INDEX.93 AVTMTR100 Rev B October 2003 iii LIST OF ILLUSTRATIONS Figure 4-1. Single-Phase TTR Test Set Block Diagram .16 Figure 4-2 Single-Phase TTR Display 1.5V rms or 8V rms for testing CTs. Current: up to 100 mA Test Frequency 55Hz, internally generated providing a universal 50 / 60 Hz test set. Loading of Test Transformer Less than 0.1 VA M AVTMTR100 Rev B October 2003 10 Measuring Ranges Turn ratio: 8 V rms: 0.8 to 20,000, 5 digit resolution (For transformers 20 120 sec for turns ratio, phase shift, excitation current, polarity, transformer vector group, and winding d.c. resistance testing depending on type and power rating of transformer. Display Wide temperature range LCD module, 128 x 64 dots, 21 characters by 8 lines. Memory Storage Up to 200 test results (single phase or 3-phase transformers) and up to 100 user defined transformer settings. Interface RS232C port, 9 pin, up to 57.6 Kbaud (19.2 Kbaud for printer) Environmental Conditions Operating temperature range: -4 to 131F (-20 to 55 C) Storage temperature range: -58 to 140F (-50 to 60 C) Relative humidity: 0 to 90% noncondensing (operating) 0 to 95% noncondensing (storage) M AVTMTR100 Rev B October 2003 12 Physical Data Dimensions: 9.5 x 4.5 x 1.875 in. (241 x 115 x 48 mm) (H x W x D) Weight (test set): 3.3 lb. (1.5 kg) Case: Light gray color ABS case Accessories Supplied ? Carrying case with strap for instrument and attachable pouch for provided accessories, (p/n 55-20008). ? Power supply cord for battery charger, determined by country. ? Universal battery charger, (p/n 35757) ? H winding test cable, 6 ft (1.8 m), two leads (marked H1 and H2) for single phase transformer testing, and ground lead (marked GROUND), shielded, heavy-duty clip-end terminated, (p/n 35502 521). ? X winding test cable, 6 ft (1.8 m), three leads (marked X1, X2, and X3) for single phase (with up to two secondary windings) transformer testing, shielded, heavy-duty clip-end terminated, (p/n 35502 511). ? Software for uploading test results to a PC, (p/n 35794 2). ? RS232 cable for connecting the TTR to a PC, (p/n 33147 18). ? Quick start guide, (p/n 55-20013). ? Instruction manual, (AVTMTTR100). Optional Accessories ? Battery/line-powered serial thermal printer package for 120 V ac (p/n 35755-1). The package includes the thermal printer, a battery pack, an AC adapter and interface cable. ? Battery/line-powered serial thermal printer package for 230 V ac (p/n 35755-2). The package includes the thermal printer, a battery pack, an SPECIFICATIONS AVTMTR100 Rev B October 2003 13 AC adapter and interface cable. Printed out data includes date, transformer vector group according to ANSI, IEC or AS (Australian) standard, transformer under test ID, calculated and measured turn ratios, ratio deviations, polarity, phase deviation angle, test voltage, exciting current values, and winding resistance. ? X winding test cable, 12 ft (3.6 m), three leads (marked X1, X2, and X3) for single phase (with up to two secondary windings) transformer testing, shielded, heavy-duty clip-end terminated (p/n 35502-510). ? H winding test lead, 12 ft (3.6 m), two leads (marked H1 and H2) for single phase transformer testing, and ground lead (marked GROUND), shielded, heavy-duty clip-end terminated (p/n 35502-520). ? Semi hard fabric transport case, (p/n 35788) ? Additional battery pack, (p/n 35753) ? Additional printer paper, one roll, (p/n 27705-1) ? Deluxe kit with 120 V printer (p/n55-10002) ? Deluxe kit with 230 V printer (p/n55-10003) ? Inverter 12VDC/120Vac (p/n 35754) M AVTMTR100 Rev B October 2003 14 M AVTMTR100 Rev B October 2003 15 4 DESCRIPTION Principle of Operation The TTR test set provides accurate measurements of the transformer input and output voltages and then calculates a transformer turn ratio. The TTR also measures phase shift between primary and secondary windings of a transformer, the DC resistance winding and transformer excitation current. In addition, it provides polarity indications for single phase distribution transformers. A block diagram of single-phase TTR is shown in Figure 4-1. The excitation voltage oscillator applies a 55-Hz test voltage to a transformer under test. There are three test voltages: 0.3 V used for checking connections, 1.5 V used for current transformer testing, and 8 V used for current and voltage transformer testing. Resistance measuring circuitry tests primary and secondary winding resistance at 25 mA (max) DC current. Input and output transformer voltages go through conditioning circuitry. This circuitry improves signal-to-noise ratio of the test signal, and provides full voltage range of the test signals at A/D converter inputs. A/D converter is used to convert the analog measurement signals to their digital replica. The converted output digital signals are applied to CPLD (complex programmable logic device) and then are transferred to microprocessor. The microprocessor is the main part of the TTR test set. It provides proper timing sequence of operation, gathers and calculates the test result, and interfaces with peripherals. There are five main peripherals in the TTR test set: RTC (real time clock), external memory, RS-232/Printer port, LCD display, and alphanumeric keypad. DC power supply converts the primary battery voltage (NiMH battery pack, 3.6 V, 3800 mAh) into the voltages needed for proper operation of the test set. M AVTMTR100 Rev B October 2003 16 Figure 4- 1. Single- Phase TTR Test Set Block Diagram Controls, Indicators, and Connectors (Figure 4- 2) Contrast Backlight This knob adjusts the viewing resolution of the screen. A momentary depression of the switch will either activate or de- activate the backlight. It will remain ON for a period of three minutes without activity. Power ON Switch Power OFF Switch Depressing this switch momentarily will active the TTR100. Depressing this switch momentarily will de-active the TTR100. EMERGENCY TEST OFF By depressing any key on the keypad will terminate the test in progress. DISPLAY SCREEN LCD displays menus and test information. A low battery indicator will be displayed in the upper right corner when one hour of energy is remaining in the battery pack. MICROPROCESSOR CPLD Exc. Voltage Oscillator Transformer Under Test Resistance Measuring Circuitry Input/Output Signal Conditioning Circuitry A/D Converter RTC Memory RS-232/Printer Port 128x64 LCD Alpha-numeric Keypad DC Power Supply DESCRIPTION AVTMTR100 Rev B October 2003 17 KEYPAD 16-button keypad for entering menu selections and navigating through the various screens. In addition to alpha-numeric keys, there is a left 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 terminals of the same polarity. F 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. NOTE: The TTR100 may supply up to 100 mA of excitation current. The TTR100 will automatically select the appropriate test voltage (8 V or 1.5 V) when testing CTs. Some current transformers with turn ratio of 150:5 and less requires more than 100 mA of excitation current when excited from1.5 V source. These CTs can not be tested with the TTR100. Unmounted CTs The connection instructions of the TTR100 to the device to be tested are contained and illustrated within the TTR100. NOTE: The illustrated connection diagrams are provided as connection guides and do not suggest the physical location of the bushings / terminals of the device being tested. Figure 5-5 shows the setup for testing unmounted current transformers. 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 transformer entrance bushing. The test can be performed without removal of the BCT from the equipment. Connect the TTR100 to BCT as shown in Figure 5-7. NOTE: A jumper lead is not supplied with the TTR100. M AVTMTR100 Rev B October 2003 24 Figure 5- 5. Setup for Testing Unmounted Current Transformer Figure 5- 6. Setup for Testing Taps on Multiple Tap CT TTR 100 SETUP AND CONNECTIONS AVTMTR100 Rev B October 2003 25 Figure 5- 7. Setup for Testing BCT Mounted on Single- Phase Two- Winding Transformer M AVTMTR100 Rev B October 2003 26 T- Type Transformers T-type transformers represents the special type of thee-phase transformers. This transformer may be tested as a single phase transformer. To make a measurement on a T-type transformer, match the vector diagram from the transformer nameplate to the corresponding winding connection diagram fr