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Guildline 6624CT-3000 Operation Manual

High current dc transformer
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Operation Manual
For The
6624CT-3000
High Current DC Transformer
www.guildline.com
NOTICE
The contents and information contained in this manual are proprietary to
Guildline Instruments Limited. They are to be used only as a guide to the
operation and maintenance of the equipment with which this manual was
issued and may not be duplicated or transmitted by any means, either in whole
or in part, without the written permission of Guildline Instruments Limited.
OM6624CT-3000-A-00
11 May, 2016

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Summary of Contents for Guildline 6624CT-3000

  • Page 1 NOTICE The contents and information contained in this manual are proprietary to Guildline Instruments Limited. They are to be used only as a guide to the operation and maintenance of the equipment with which this manual was issued and may not be duplicated or transmitted by any means, either in whole or in part, without the written permission of Guildline Instruments Limited.

  • Page 3: Table Of Contents

    3.1.1. Current Measurement all Ranges ........................3-1 3.1.2. Calculation of the Unknown Shunt Resistance ....................3-3 3.1.3. Recommended Test Setup Limits and Precautions for the 6624CT-3000 ............ 3-3 3.1.4. Checks and Precautions ..........................3-3 VERIFICATION AND CALIBRATION ............... 4-1 4.1.
  • Page 4 4.2. TEST EQUIPMENT REQUIRED ........................4-1 4.3. PROCEDURE ..............................4-2 4.3.1. Preliminary Connections to the 6624CT-3000 ....................4-2 4.3.2. Measurement of the Potentials on the Resistors ..................... 4-2 4.3.3. Calculation of the Range Ratios ........................4-3 TROUBLESHOOTING AND MAINTENANCE ............5-1 5.1.
  • Page 5 FIGURE 2-1 : LINE VOLTAGE SELECTOR......................2-2 FIGURE 2-2 : 6624CT-3000 FRONT VIEW ........................ 2-7 FIGURE 2-3 : 6624CT-3000 REAR VIEW ........................2-9 FIGURE 2-4 : 6624CT-3000 CONNECTIONS ......................2-10 FIGURE 2-5 : 6624CT-3000 WITH PRIMARY CURRENT SHUNT CONNECTIONS ........2-11 OM6624CT-3000-5-00 11 May, 2016...
  • Page 6 LIST OF TABLES TABLE 2-1 : FUSE RATINGS ............................2-2 TABLE 3-1 : 6624CT-3000 TEST SETUPS ........................3-4 TABLE 6-1 : GENERAL SPECIFICATIONS ......................6-1 TABLE 6-2 : GENERAL SPECIFICATIONS (CONTINUED) ................. 6-2 OM6624CT-3000-5-00 11 May, 2016...

  • Page 7: Introduction

    Current Range Extender. The direct current transformer is designed with an open window to pass through a cable, set of cables, or buss bar that carry the current to be measured. The 6624CT-3000 High Current DC Transformer produces an output current that varies directly with the input current in three ranges.

  • Page 8: Overview

    1.3. OVERVIEW The Model 6624CT-3000 High Current DC Transformer is a precision, fixed ratio, direct current transformer based on the principle of the direct current comparator. Figure 1-1 illustrates the instrument circuits in block diagram form. Connections to the Guildline CS1000 Current Source Units and the Model 66259 Extender Control Unit are shown when it is desired to use these as the current source.

  • Page 9: Figure 1-1 : Model 6624Ct-3000 Block Diagram

    Voltmeter Servo Amplifier Flux Detector Demodulator Magnetic Slave PSU Modulator Servo Amplifier Flux Detector 6623A-3S Magnetic Demodulator Modulator Slave PSU Control Unit 1000T Current Comparator Toroid 3A Voltmeter Voltmeter Figure 1-1 : Model 6624CT-3000 Block Diagram OM6624CT-3000-5-00 11 May, 2016...

  • Page 10: Installation

    2.1. PRELIMINARIES Note that the Model 6624CT-3000 High Current DC Transformer includes a separate 6623A-3S DC Current Transformer Control Unit. The 6624CT-3000 High Current DC Transformer is connected to the 6623A-3S DC Current Transformer Control Unit with a 1.5 m cable. The 6623A- 3S is normally shipped set for 240 Volt, 50/60 Hz operation.

  • Page 11: Fuse Replacement

    Section 2 2.1.3. Fuse Replacement Only fuses with specified current rating type should be used for replacement if necessary. See Table 2-1. FUSES (TIME DELAY TYPE) 100 V 120 V 220 V 240 V 2 A, 250 V, (T) 2 A, 250 V, (T) 1 A, 250 V, (T) 1 A, 250 V, (T) Table 2-1 : Fuse Ratings...

  • Page 12: Setup And Power On

    Transformer Unit using the 12 conductor cable provided. One end is to be connected to the circular connector on the back panel of the 6623A-3S marked 'DCCT-3000' and the other end to the circular connector on the back panel of the 6624CT-3000 marked 'CONTROL'.
  • Page 13 If it is to be utilized, connect the 'OUT+' buss of the CS1000 units through the window of the 6624CT-3000 going from left to right looking from the front panel with suitable heavy current cables. Continue to connect the other end of the cables across a shunt that is to be measured or to the 'OUT-' buss of the CS1000 units such that a complete circuit is provided.

  • Page 14: Incoming Inspection

    If no faults are displayed during power up then proceed to measure a selected test current. A 1 ohm or less Reference Shunt, such as a Guildline 9230A-10-1 must be installed on the 6623A-3S front panel terminals marked '3 A BURDEN' and a shorting link on the 6623A-3S terminals marked '150 mA BURDEN'.
  • Page 15 A small offset is a satisfactory indication that a balance condition exits on the 6624CT-3000 Transformer Unit. Note that an averaging function on the DVM will be required to smooth out small variations in the current source output.

  • Page 16: 6624Ct-3000 Front View

    Section 2 2.3. 6624CT-3000 FRONT VIEW Figure 2-2 : 6624CT-3000 Front View 2.3.1. Power The Power indicator is lighted when the AC power is applied to the units and the power switches on the rear panels are 'ON'. The power indicator on the 6623A-3S may dim if a large comparator imbalance condition exists.

  • Page 17: 150 Ma Burden

    The full scale output is 150 mA. 2.3.5. Range Switch The Range Switch located on the 6624CT-3000 High Current DC Transformer allows for selection of 1000:1, 500:1 and 100:1 current transformation ratios with full scale values of 3000, 1500 and 300 A respectively.

  • Page 18: 6624Ct-3000 Rear View

    CS1000 Current Sources and the 6623A-3S tracking of the current comparator. 2.4.3. DCCT-3000 Connector The DCCT-3000 Connector is a 16 pin circular connector which is used to connect the necessary signals to the Model 6624CT-3000 Current Transformer 'CONTROL' connector. Only 12 of the pin connections are utilized. 2.4.4. CS1000 Connector The CS1000 Connector is a 7 pin circular connector which is used to connect the necessary signals to the first 1000A current source 'INPUT' connector.

  • Page 19: Figure 2-4 : 6624Ct-3000 Connections

    Section 2 Voltmeter on REF Shunt Current Source Figure 2-4 : 6624CT-3000 Connections OM6624CT-3000-5-00 2-10 11 May, 2016...

  • Page 20: Figure 2-5 : 6624Ct-3000 With Primary Current Shunt Connections

    Section 2 Voltmeter on Voltmeter on REF Shunt DUT Shunt Current Source Figure 2-5 : 6624CT-3000 with Primary Current Shunt Connections OM6624CT-3000-5-00 2-11 11 May, 2016...

  • Page 21: Quick Measurement Guide

    The Model 6624CT-3000 High Current DC Transformer can be used to measure and monitor high DC currents up to 3000 A in three ranges. As well, the 6624CT-3000 can be used to determine the ratio of a high current shunt with that of a low current shunt such that the DC resistance of the high current shunt can be determined from the known resistance of a low current reference unit.
  • Page 22 Note that where the reference shunt is used on the 150 mA Burden terminals, the Range Ratio is twenty times the selection on the 6624CT-3000 Transformer Unit. OM6624CT-3000-5-00 11 May, 2016...

  • Page 23: Calculation Of The Unknown Shunt Resistance

    Section 3 3.1.2. Calculation of the Unknown Shunt Resistance The resistance of the unknown shunt resistor on the primary side of the 6624CT-3000 can be calculated from the measurements made in steps 7 and 8 above and with additional measurements of the potentials on the unknown shunt potential terminals. Calculate the...

  • Page 24: Table 3-1 : 6624Ct-3000 Test Setups

    2000 3000 1000:1 20,000:1 1000 3000 1000:1 20,000:1 1500 1500 500:1 10,000:1 1000 1500 500:1 10,000:1 1500 500:1 10,000:1 1500 500:1 10,000:1 100:1 2,000:1 100:1 2,000:1 100:1 2,000:1 100:1 2,000:1 Table 3-1 : 6624CT-3000 Test Setups OM6624CT-3000-5-00 11 May, 2016...

  • Page 25: Verification And Calibration

    DC Transformer. 4.1.1. Purpose The purpose of this procedure is to assure that the 6624CT-3000 High Current DC Transformer meets the manufacturer’s specifications. It is recommended that these procedures be performed after any corrective maintenance activity, or if the operator perceives a problem with respect to ratio accuracy.

  • Page 26: Procedure

    4.3.2. Measurement of the Potentials on the Resistors Set the 6624CT-3000 range switch to the 1000:1 position and apply a test current of 100 A through the window of the 6624CT-3000 and the 9230A-300-0.001 Current Shunt.

  • Page 27: Calculation Of The Range Ratios

    0.001 ohm current shunt. Repeat the steps of 4.3.2. and 4.3.3. above for the 500:1 and 100:1 ranges of the 6624CT-3000. Record the results and verify that the ratios as calculated are within 10 parts in 10 of the nominal ratios.

  • Page 28: Troubleshooting And Maintenance

    Section 5 TROUBLESHOOTING AND MAINTENANCE 5.1. INTRODUCTION This section covers troubleshooting, and maintenance of the 6624CT-3000 High Current DC Transformer. 5.1.1. Model 6623A-3S Controller Fault Indications The meter indicator on the 6623A-3S Controller front panel will remain off scale whenever a large imbalance condition is detected in the comparator circuit.

  • Page 29: Appendices

    Section 6 APPENDICES 6.1. GENERAL SPECIFICATIONS 6624CT-3000 High Current DC Transformer General Specifications Operating Temperature to Full +23 ± 3 °C Specification +73.4 ± 5.4 °F Operating Temperature Maximum +18 to +28 °C Range < 50 % RH +64.4 to +82.4 °F...

  • Page 30: Table 6-2 : General Specifications (Continued)

    Section 6 6.2. GENERAL SPECIFICATIONS (continued) 6624CT-3000 High Current DC Transformer General Specifications (3 Year) Transformation Ratios, 3 A Output 1000:1, 500:1, 100:1 Transformation Ratios, 0.15 A Output 20,000:1, 10,000:1, 2,000:1 Transformation Ratio Accuracies ± 10 Linearity ± 0.1 ppm of full scale Temperature Coefficient ±...

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