Biddle 830280_UG 电路图.pdf

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1、AVTM830280 Rev. C July 2008 Instruction Manual AVTM830280 for Transformer Ohmmeter Catalog No. 830280 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 Center 2621 Van Buren Aven

2、ue Norristown, PA 19403 U.S.A. 610-676-8500 RadioFans.CN 收音机爱 好者资料库 M Copyright 2008 by Megger. All rights reserved. The information presented in this manual is believed to be adequate for the intended use of the product. If the product or its individual instruments are used for purposes other than

3、those specified herein, confirmation of their validity and suitability must be obtained from Megger. Refer to the warranty information included in this instruction manual. Specifications are subject to change without notice. RadioFans.CN 收音机爱 好者资料库 AVTM830280 Rev C (07/2008) i Table of Contents 1. G

4、ENERAL INFORMATION.1 1.1 About The Transformer Ohmmeter.1 1.2 Features.2 1.3 Upon Receipt of Product.2 1.4 Unpacking and Inspection .3 1.5 Safety First.3 1.6 How To Use This Manual.3 1.6 Preparation for Use.4 1.7 Line Supply Voltage.4 1.8 Repacking and Shipment.4 1.9 Specifications.5 1.10 Accessorie

5、s Furnished.6 1.11 Changes.7 1.12 Warranty .7 2. SAFETY.9 2.1 Introduction.9 2.2 General Safety Precautions.9 2.3 Safety In Using The Transformer Ohmmeter.10 3. OPERATING INSTRUCTIONS.11 3.1 Panel Controls and Operating Functions.11 3.2 Principle of Operation .14 3.3 General Operating Instructions f

6、or single-phase high voltage transformers (500 kV), the drift may last for a fraction of a minute; for large delta connected transformers the drift may last longer as a result of circulating current. e.g. 345MVA, 500kV single-phase transformer requires approximately 2 minutes for the display to sett

7、le. 1.6 PREPARATION FOR USE THIS INSTRUMENT IS DESIGNED TO OPERATE WITH HIGHLY INDUCTIVE TRANSFORMERS. ANY BREAK IN CONNECTION WHILE D.C. CURRENT IS FLOWING MAY RESULT IN HIGH VOLTAGE FLASHOVER. It is highly recommended that the operator familiarize himself with the controls and functions detailed i

8、n Section 3 prior to use. ALL SAFETY PROCEDURE AND PRECAUTIONS MUST BE FOLLOWED WHEN OPERATING ON LINES WITH LETHAL VOLTAGES OF HIGH CAPACITY. 1.7 LINE SUPPLY VOLTAGE This instrument is shipped from the factory for operation on a 115 volt, 60Hz line. To prevent damage to the instrument, select the p

9、roper line voltage on the front panel selector before connection to a line supply. 1.8 REPACKING AND SHIPMENT To insure proper shipment of this instrument, it is recommended that the original shipping case be retained. If being returned for calibration or service, please attach a card to the instrum

10、ent specifying the owner, model and serial number and service required. General Information AVTM830280 Rev C (07/2008) 5 1.9 SPECIFICATIONS The detailed specifications for the model are given below. Input Power: 120/240 V, 50/60Hz, 350 VA Measurement Principle: Electronic Thompson-type circuit Curre

11、nt Supply Principle: Electronically generated and regulated Test Current: Switch selectable Ranges: 5 mA, 50 mA, 500 mA, 5 A (dc) Open Circuit Test Voltage: 30 V dc Rating: Continuous use on all ranges Indication: Mechanical indicator (indication of current flow even when instrument turned off or un

12、plugged). Output current displayed on display A(in %). Over Temperature Protection: Automatic current shutdown with L.E.D. indication of over temperature condition for 5A range. Resistance Measurements: Inputs: Two isolated high impedance inputs, each with separate range control and protection provi

13、ded for flashover caused by inductive kickback Ranges (ohms): Nominal Resolution Maximum Display 2m 0.001m 1.999m 20m 0.01m 19.99m 200m 0.1m 199.9m 2 0.001 1.999 20 0.01 19.99 200 0.1 199.9 2000 1.0 1999 Accuracy: 0.5% reading, 0.5% full scale (when current has stabilized). M 6 AVTM830280 Rev C (07/

14、2008) Overrange: Indicated by leading number 1 displayed with all other digits blanked. Operation: Environmental: Operating: 32 to 104 F (0 to 40C) RH to 80% Storage: -40 to 149 F (-40 to +65C) Temperature Coefficients: 0.05% of applicable accuracy specification per C of resistance range. Displays:

15、Two high-temperature, 0.7 in. (18 mm), liquid crystal 3 -digit displays showing 1999 at full scale. Update rate is approximately three times per second. Physical: Instrument and accessories supplied with portable foam lined carrying case. Case has hinged opening from above with a lockable latch. Siz

16、es: Instrument: 11 H x 16 W x 10.5 D in. 280 H x 406 W x 267 D mm Case: 13 H x 20 W x 21 D in. 330 H x 508 W x 533 D mm Weight: Instrument: Net 40 lb (18 kg) Shipping: 75 lb (34 kg) 1.10 ACCESSORIES FURNISHED Each instrument is supplied complete with: ? Two sets of potential leads, 33 ft (10 m) ? On

17、e set of current leads, 33 ft (10 m) ? One shorting lead, 9.9 ft (3 m) ? Universal bushing adapters (set of 4) ? AC power cord ? One operating and instruction manual ? One transport case General Information AVTM830280 Rev C (07/2008) 7 1.11 CHANGES Please note that this instrument is subject to cont

18、inuous development and improvement. This instrument may therefore incorporate minor changes in detail from the information contained herein. 1.12 WARRANTY Megger warrants this instrument sold by us or our authorized agents, to be free from defects in material and workmanship for a period of 12 month

19、s from date of shipment. During the warranty period, Megger will, at our option, repair or replace the Instrument or part thereof which proves to be defective providing: (1) The Instrument is returned properly packed and transportation prepaid with prior authorization from us or our appointed agent,

20、 (2) The Instrument has not been altered, modified or repaired by unauthorized personnel and, (3) That our examination discloses to our satisfaction that any improper operation or failure was the result of defective material or workmanship and was not the result of improper use, negligence or accide

21、nt, exceeding environmental limits, or connecting the instrument to incompatible equipment. This warranty is exclusive and is given and accepted in lieu of all other warranties, express or implied, and constitutes fulfillment of all our liabilities to the purchaser. Megger specifically disclaims the

22、 implied warranties of merchantability and fitness for a specific purpose. We assume no liability, in any event, for consequential damages, for anticipated or lost profits, for personal injury due to use or accident, for incidental damages or loss of time or other losses incurred by the purchaser or

23、 any third party in connection with instruments covered by this warranty or otherwise. M 8 AVTM830280 Rev C (07/2008) M AVTM830280 Rev C (07/2008) 9 2. SAFETY 2.1 Introduction Megger has designed the Transformer Ohmmeter and the recommended operating procedures with careful attention to safety. It p

24、erforms formal safety reviews of the initial design and any subsequent changes to all new Megger products. The safety review covers areas over and above those included in applicable IEC and ANSI standards. Regardless of these efforts, it is not possible to eliminate all hazards from electrical test

25、equipment or to foresee every possible hazard. You are therefore urged not only to follow the safety rules in this manual, but also to consider carefully all safety aspects of the test before proceeding. Safety is the responsibility of the user. The design of this equipment follows safety specificat

26、ions IEC 1010-1 and ANSI/ISA 582.01 and meets the requirements for Class I, Installation Category II equipment. Megger recommends that a qualified operator attend the system at all times while it is in operation. Only qualified service personnel should replace components or make internal adjustments

27、. 2.2 General Safety Precautions The equipment and the cable to which the Transformer Ohmmeter connects are sources of high-voltage electrical energy. Observe the following safety precautions: ? Observe all safety warnings on the equipment. They identify areas of immediate hazard that could result i

28、n injury or death. ? Use this equipment only for the purposes described in this manual. ? Treat all terminals of high-voltage power equipment as potential electric shock hazards. ? Use all practical safety precautions to prevent contact with energized parts of the equipment and related circuits. ? U

29、se suitable barriers, barricades, or warnings to keep persons not directly involved with the work away from test activities. ? Never connect the test equipment to energized cables. ? Do not connect to energized equipment or use in an explosive atmosphere. M 10 AVTM830280 Rev C (07/2008) ? Use the gr

30、ounding and connection procedures recommended in this manual. ? Observe strictly the warning and caution notices used throughout this manual (see How to Use This Manual” on page 3). 2.3 SAFETY IN USING THE TRANSFORMER OHMMETER Safety is the responsibility of the user. When applying current to a tran

31、sformer with very high inductance, care should always be taken not to remove current leads while current is still flowing. This causes an extremely high voltage to develop across the point where current is broken. With correct conditions, this voltage may even be lethal to the operator breaking the

32、current path. The Megger Transformer Ohmmeter has built-in safety protection. This safety feature is present in the form of an alternate route through either of the potential leads. Example: If a current lead is disconnected while current is flowing through the transformer, the current will flow thr

33、ough the alternate path of the potential lead without damage to instrument or electrical shock to operator. F WARNING It is very important, therefore, not to connect potential leads on top of or to close to current leads. In this way, if one lead falls off the transformer, the other lead will automa

34、tically follow. F WARNING The Transformer Ohmmeter is protected in the event of both potential and current lead falling off at the same time. This does not mean, however, that the operator will not feel the high voltage that will be developed (if he is standing near the area where the lead disconnec

35、ts). AVTM830280 Rev C (07/2008) 11 3. OPERATING INSTRUCTIONS 3.1 PANEL CONTROLS AND OPERATING FUNCTIONS This section details and describes the operating functions of the Transformer Ohmmeter. Refer to Figure 1. 1. Power ON. Flipping this switch upwards will activate the instrument. With current cont

36、rol (4) in the center position, ready LED (5) will illuminate 15 seconds after the instrument is turned on. 2. Line Input Socket. This international line socket also contains the line fuse and a spare fuse. 3. Line Voltage Selector. The instrument is configured at the factory for 115 volt operation.

37、 Failure to select the correct line voltage could result in damage to the instrument. 4. Current Control. This switch is used to initiate current flow from the instrument (up) and to activate a process whereby the device under test is discharged (down). 5. Ready L.E.D. This L.E.D. must be illuminate

38、d to initiate a given test. This indicator will be inactive under the following conditions ? the test has been initiated ? the test specimen is undergoing discharge ? the surrounding electrical interference exceeds the instruments suppression capability 6. Over Temperature L.E.D. This L.E.D. illumin

39、ates when the instruments internal components have exceeded their thermal capacity. This condition typically occurs after extended operation on the 5A range. A period of approximately 20 minutes is required before the instrument will again operate. 7. Current Light Emitting Diode (LED). This low-ene

40、rgy consuming electronic component signals current flow through the output terminals (9) and/or excitation voltage. M 12 AVTM830280 Rev C (07/2008) 8. Potential Input A. Connected across a transformer winding, this input measures the winding voltage drop and displays the related resistance value on

41、display A (15). 9. Current Output. Connected across a transformer winding, this output supplies a selected D.C. current through the winding. 10. Potential Input B. Connected across a transformer winding, this input measures the winding voltage drop and displays the related resistance value on displa

42、y B (16). 11. Current Selector. This switch allows selection of the test current which will be supplied to the transformer windings via output terminals (9). It also changes resistance ranges, increasing resolution with an increase in the test current range. 12. Range Selector A. This switch changes the resistance