Biddle 220070_Series_UG 电路图.pdf

AVTM22-726Jc Rev A May 2005 Instruction Manual for the DC Dielectric Test Sets Catalog Nos. 220070: 70kV Digital Metering 220072: 70kV Analog Metering 220123: 120 kV Digital Metering 220124: 120 kV Analog Metering 220163: 160 kV Digital Metering 220164: 160 kV Analog Metering High-Voltage Equipment Read the entire manual before operating. Aparato de Alto Voltaje Antes de operar este producto lea este manual enteramente. M M Valley Forge Corporate Center 2621 Van Buren Avenue Norristown, PA 19403 U.S.A. RadioFans.CN 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 DC Dielectric Test Sets Catalog Nos. 220070: 70kV Digital Metering 220072: 70kV Analog Metering 220123: 120 kV Digital Metering 220124: 120 kV Analog Metering 220163: 160 kV Digital Metering 220164: 160 kV Analog Metering RadioFans.CN 收音机爱 好者资料库 Copyright 1993 - 2005 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 those specified herein, confirmation of their validity and suitability must be obtained from Megger. i AVTM22-726Jc Rev A May 2005 TABLE OF CONTENTS 1 INTRODUCTION.1 Receiving Instructions.1 General Information.1 2 SAFETY.5 General.5 General Safety Precautions for DC Testing.5 3 SPECIFICATIONS.9 Electrical.9 Safety Features.11 Physical Characteristics.12 Environmental.13 Additional Accessories WARNING Warning, as used in this manual, is defined as a condition or practice which could result in personal injury or loss of life. CAUTION Caution, as used in this manual, is defined as a condition or practice which could result in damage to or destruction of the equipment or apparatus under test. 9 AVTM22-726Jc Rev A May 2005 3 SPECIFICATIONS Electrical Table 1 delineates the electrical specifications for the test sets. Table 1: Specifications of Input and Output Cat. No. Input Voltage For nominal line voltage, single phase Output Voltage For nominal dc line voltage, continuously variable, negative polarity with respect to ground, less than 1 mA output current. Output Current Maximum rating (thermal) 220070 120 V (105-130 V) 50/60 Hz 5 A 0 to70 kV 5 mA for 30 min 3.5 mA continuous 220072 120 V (105-130 V) 50/60 Hz 5 A 0 to70 kV 5 mA for 30 min 3.5 mA continuous 220070-47 240 V (210-260 V/) 50/60 Hz 2.5 A 0 to70 kV 5 mA for 30 min 3.5 mA continuous 220072-47 240 V (210-260 V/) 50/60 Hz 2.5 A 0 to70 kV 5 mA for 30 min 3.5 mA continuous 220123 120 V (105-130 V) 50/60 Hz 10 A 0 to120 kV 5 mA for 20 min 2.5 mA continuous 220124 120 V (105-130 V) 50/60 Hz 10 A 0 to120 kV 5 mA for 20 min 2.5 mA continuous 220123-47 240 V (210-260 V) 50/60 Hz 5 A 0 to120 kV 5 mA for 5 min 2 mA continuous M 10 AVTM22-726Jc Rev A May 2005 Cat. No. Input Voltage For nominal line voltage, single phase Output Voltage For nominal dc line voltage, continuously variable, negative polarity with respect to ground, less than 1 mA output current. Output Current Maximum rating (thermal) 220124-47 240 V (210-260 V) 50/60 Hz 5 A 0 to120 kV 5 mA for 5 min 2 mA continuous 220163 120 V (105-130 V) 50/60 Hz 10 A 0 to160 kV 5 mA for 20 min 2 mA continuous 220164 120 V (105-130 V) 50/60 Hz 10 A 0 to160 kV 5 mA for 20 min 2 mA continuous 220163-47 240 V (210-260 V) 50/60 Hz 5 A 0 to160 kV 5 mA for 5 min 1.5 mA continuous 220164-47 240 V (210-260 V) 50/60 Hz 5 A 0 to160 kV 5 mA for 5 min 1.5 mA continuous Ripple is less than 2 percent on capacitive test samples at continuous-rated output values. Regulation is less than 20 percent from no-load to continuous-rated output current. Special internal guard circuit eliminates the extra meter connection lead required on most dc test sets. The simplified guard circuit reduces internal leakage current to less than 0.1 A at full-rated output voltage. Guard terminal on HV output cable allows optional connection to test sample. VOLTMETER 220070 and -47 220123 and -47 220163 and -47 Digital voltmeter: 0 70 kV Resolution: 100 volts Accuracy: 2% of reading + 100 volts 220072 and -47 4.5, Analog voltmeter: 0 40 kV, 0 80 kV Resolution: 1 kV/ 2 kv Accuracy: 2% of full scale SPECIFICATIONS 11 AVTM22-726Jc Rev A May 2005 220124 and -47 4.5, Analog voltmeter: 0 60 kV, 0 120 kV Resolution: 1 kV/ 2 kV Accuracy: 2% of full scale 220164 and -47 4.5, Analog voltmeter: 0 80 kV, 0 160 kV Resolution: 2 kV/ 4 kV Accuracy: 2% of full scale AMMETER 220070 and -47 220123 and -47 220163 and -47 Digital ammeter: 0 19.9, 0 199 A, 0 1.99, 0 5.00mA Accuracy: 2% of reading + 1 count 220072 and -47 220124 and -47 220164 and -47 4.5, Analog ammeter: 0 5 A Multipliers: x1k, x100, x10, x1 Maximum Resolution: 0.1 A Accuracy: 2% of full scale All high-voltage components are encapsulated or sealed in dielectric housing for high reliability and minimum size and weight. There is a surge-limiting resistor in series with the high-voltage output and a bleed-off resistor for the discharging of charge stored in the unit. Safety Features ! Input supply line circuit breaker. ! Output current overload relay. ! Zero-start interlock for high-voltage output. ! Push-button controls for high-voltage ON and OFF. ! Indicating lights for high-voltage ON and OFF. ! Connection for external permissive and safety switches. ! Protection against damage by overloads and surges. ! Control unit separated from HV unit by 15 ft (4.6 m) of interconnection cable. M 12 AVTM22-726Jc Rev A May 2005 Physical Characteristics CONTROL UNIT The control unit is housed in a sturdy, suitcase-style portable case. Cat. No. Dimensions Weight 220070, 220072, 220123, 2200124, 220163 and 2200164 20 x 12 x 12 in. (L x W x H) (50.8 x 30.5 x 31.8 cm) 23 lb (10.5 kg) 220070-47, 220072-47, 220123-47, 2200124-47, 220163-47 and 2200164-47 20 x 12 x 12 in. (L x W x H) (50.8 x 30.5 x 31.8 cm) 25 lb (11.4 kg) HV UNIT The HV unit is housed in a high-impact strength polyethylene housing with an adjustable shoulder carrying strap. Cat. No. Dimensions Weight 220070 and -47 22072 and -47 12 x 12 x 20 in. (L x W x H) (30.5 x 30.5 x 51 cm) 44 lb (20 kg) 220123 and -47 220124 and -47 12 x 12 x 29 in. (L x W x H) 30.5 x 30.5 x 74 cm) 65 lb (30 kg) 220163 and -47 220164 and -47 12 x 12 x 29 in. (L x W x H) (30.5 x 30.5 x 100 cm) 73 lb (33 kg) CABLE CARRYING CASE The cable carrying case is a sturdy canvas bag that holds all test cables, instruction manual, and test reports. Bag has convenient carrying handle and an adjustable shoulder strap. Cat. No. Dimensions Weight 220070 and -47 220072 and -47 12 W x 17 H x 4 in. thick (30.5 x 43 x 10 cm) 7 lb (3 kg) incl Cables SPECIFICATIONS 13 AVTM22-726Jc Rev A May 2005 Cat. No. Dimensions Weight 220123 and -47 220124 and -47 220163 and -47 220164 and -47 15 W x 17 H x 4 in. thick (38 x 43 x 10 cm) 9 lb (4 kg) incl Cables TEST CABLES AND ACCESSORIES ! One 8-ft, 3-wire input supply cord ! Two 15-ft ground cables ! One 15-fi interconnection cable ! One 15-ft shielded HV output test cable, detachable ! Instruction Manual ! Kilovolt/megohm graph paper, 100-sheet pad (Cat. No. 220000). Environmental Operating Temperature Range: -20 to 130F (-30 to 55C) Storage Temperature Range: -40 to 150F (-40 to 65C) Relative Humidity: 0 to 90% non-condensing (operating) 0 to 95% non-condensing (storage) CAUTION Storage for extended periods of time at high temperature and relative humidity may cause degradation of the digital displays. M 14 AVTM22-726Jc Rev A May 2005 Additional Accessories then disconnect the input power cord; then disconnect the interconnection cable; and finally disconnect the two ground cables. Operation Notes 1. In the event of a test sample breakdown or an excessive load current, either the MAIN BREAKER or line relay will trip out. The VOLTAGE CONTROL must be returned to the 0 (RESET) position before high voltage can be applied again. 2. A high-voltage resistance discharge stick may be used initially to ground the test sample high-voltage terminal to hasten the sample discharge after the kilovoltmeter indicates the voltage has diminished to a low, safe level. 3. If excessive leakage current is observed, it may be due to a high corona high- voltage termination. Refer to the setup instructions. It should also be noted that the test set measures the total test sample current including surface leakage, unless guarded. 4. When measuring the leakage current of test samples which have a significant capacitance, small line voltage transients may cause large transient swings of the current meter. This effect will be most noticeable when using the CONTROLS then disconnect the input power cord; then disconnect the interconnection cable; and finally disconnect the two ground cables. M 30 AVTM22-726Jc Rev A May 2005 M 31 AVTM22-726Jc Rev A May 2005 6 APPLICATION NOTES Theory Any device that uses electrical energy can ordinarily be considered as consisting of elements that may be classified in two separate categories; those parts of the apparatus that conduct the electrical energy, and those parts that are not intended to conduct. It follows that any such apparatus includes an insulation system that is not intended to conduct electrical energy but which is under electrical stress. If such insulating parts do become conductive, the apparatus will fail. Electrical insulation can be tested by a variety of methods, and measures may be taken to anticipate such failures. Each method has its own merits, but one technique is to apply a dc voltage to the insulation system and measure such quantities as the applied voltage, the leakage current, and the manner in which such quantities vary with time. These dc test techniques have been well developed over many years, and considerable literature exists on this subject. The following references contain detailed information on the subject of dc testing: Guide for Testing Insulation Resistance of Rotating Machinery, IEEE Standard 43. Guide for Insulation Maintenance for Large Alternating Current Rotating Machinery, IEEE Standard 46. Guide for Making Dielectric Measurements in the Field, IEEE Standard 62. Guide for Insulation Testing of Large AC Rotating Machinery with High Direct Voltage, IEEE Standard 95. Guide for Making High Direct Voltage Tests on Power Cables in the Field. IEEE Standard P400. Standard Handbook for Electrical Engineers. Donald G. Fink and John M. Carroll, McGraw-Hill, 1968. M 32 AVTM22-726Jc Rev A May 2005 Circuit Description The schematic diagrams of Figures 9 and 10 show the electrical operation of the 70-kV test set and the 120 and 160-kV test sets, respectively. Power is supplied to the test set through the three-conductor input cable. The green wire of this cable conforms to electrical code requirements and provides a separate panel ground connection. For safety purposes two separate ground cables are provided to prevent a shock hazard to the operator or damage to the test set. The ground lead connected to the test sample provides a current return path to the test set while the other ground lead permits connection to a known earth ground. Input power is brought directly to the main power switch K1, a magnetic circuit breaker of the trip-free type. This switch also serves as the test set on/off switch. A second pole on this circuit breaker provides protection for autotransformer Tl so that under all overload circumstances at least one pole will have a current overload. If either circuit breaker pole is tripped by overload, both poles will open. Test sets equipped with the 240 V 50/60 Hz option differ from standard sets only in that a separate step-down transformer (T2) is connected in series with the input. It is connected between the input power cord and main power circuit breaker K 1. The 240 V ac input is stepped down to 120 V ac before reaching the circuit breaker. This transformer is wired as an autotransformer to minimize the required kVA rating and thus reduce size and weight. With this option, line fuses Fl and F2 are connected in the two input lines to provide protection to step-down transformer T2 in case of a malfunction. The step-down transformer and fuses are mounted in the bottom of the instrument case. The power controlled by K1 is brought to relay K2. Autotransformer T2 receives power under control of K2. Output voltage is controlled by the variable autotransformer T1, whose output feeds the primary of the high-voltage transformer T101 via the test set interconnection cable. The shield of the interconnection cable provides a second ground for the test set control panel. The zero-start safety feature of this test set requires that the voltage control Tl be set at 0 (RESET) in order for the advance of the voltage control to develop an output voltage. This feature is a function of control relay K2, whose contacts remain open after the power source is connected and after circuit breaker K1 is closed. This prevents the application of voltage to the input of high-voltage transformer T101 until the contacts of relay K2 are mechanically closed. The contacts are closed by 0 (RES