Vanguard CBCT User Manual
TM
CBCT
CIRCUIT BREAKER COIL TESTER
USER’S MANUAL
Vanguard Instruments Company, Inc.
1520 S. Hellman Ave.
Ontario, California 91761, USA
TEL: (909) 923-9390
FAX: (909) 923-9391
August 2010
Revision 1
CBCT USER’S MANUAL REV 1
SAFETY SUMMARY
FOLLOW EXACT OPERATING PROCEDURES
Any deviation from the procedures described in this User’s Manual may create one or more
safety hazards, may damage the CBCT, or cause errors in the test results. Vanguard Instruments
Company, Inc. assumes no liability for unsafe or improper use of the CBCT.
All safety precautions provided in this manual must be observed during all phases of testing
including test preparation, test lead connection, actual testing, and test lead disconnection.
SAFETY WARNING AND CAUTIONS
The CBCT shall be used only by trained operators. All devices under test shall be off-line and
fully isolated.
DO NOT MODIFY TEST EQUIPMENT
To avoid the risk of introducing additional or unknown hazards, do not install substitute parts or
perform any unauthorized modification to any CBCT test unit. To ensure that all designed safety
features are maintained, it is highly recommended that repairs be performed only by Vanguard
Instruments Company factory personnel or by an authorized repair service provider.
Unauthorized modifications can cause safety hazards and will void the manufacturer’s
warranty.
WARNING
Do not remove test leads during a test. Failure to heed this warning can result in lethal
electrical shock to personnel and damage to the equipment.
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REV 1 CBCT USER’S MANUAL
TABLE OF CONTENTS
CONVENTIONS USED IN THIS DOCUMENT ..................................................................................... 1
1.0 INTRODUCTION .................................................................................................................. .. 2
1.1 General Description and Features ................................................................................... 2
1.2 Technical Specifications ................................................................................................... 3
1.3 CBCT Controls and Indicators .......................................................................................... 4
2.0 OPERATING PROCEDURES ................................................................................................... 6
2.1 CBCT Cable Connections .................................................................................................. 6
2.2 Setting the Output Voltage .............................................................................................. 8
2.3 CBCT Timer Start Input .................................................................................................... 9
2.4 CBCT Timer Stop Input ................................................................................................... 10
2.5 CBCT Timer Display ........................................................................................................ 10
LIST OF FIGURES
Figure 1. CBCT Controls and Indicators........................................................................................... 4
Figure 2. CBCT Constant Output to CB Control Circuits .................................................................. 6
Figure 3. Direct Connection from CBCT Pulse Output to CB Trip Coil ............................................ 7
Figure 4. Direct Connection from CBCT Pulse Output to CB Close Coil .......................................... 7
Figure 5. Typical CBCT Timer Connection ....................................................................................... 9
LIST OF TABLES
Table 1. CBCT Technical Specifications ........................................................................................... 3
Table 2. Functional Descriptions of CBCT Controls and Indicators ................................................. 5
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CBCT USER’S MANUAL REV 1
CONVENTIONS USED IN THIS DOCUMENT
This document uses the following conventions:
• A key, switch, or knob on the CBCT is indicated as [KEY], [SWITCH], and [KNOB].
Menu names are referenced as “MENU NAME”
•
• CBCT LCD screen output is shown as:
MAIN MENU
<RUN TEST>
• Warning messages are indicated as:
Warning message
WARNING
• Important notes are indicated as:
Note details
NOTE
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REV 1 CBCT USER’S MANUAL
1.0 INTRODUCTION
1.1 General Description and Features
The Vanguard Circuit Breaker Coil Tester (CBCT) is a variable voltage DC power supply designed
specifically to test substation circuit-breaker Open and Close coils. The CBCT uses the
substation’s DC power supply to electronically generate a programmable output voltage from
5% to 95% of the source voltage. The CBCT can maintain up to an 80A test current while
maintaining 2% or better voltage regulation during the circuit breaker coil operation. The CBCT
provides a safe and convenient method for testing minimum operating voltages of Open and
Close coils.
The CBCT provides one pulse and one continuous DC output. The unit’s built-in short-circuit
protection feature protects the coil under test if the current exceeds 80 amperes or if the
current drawing duration is more than 500 milli-seconds. A general purpose single channel
timer is also available for checking circuit breaker operating time or for any other timing
application.
Input Voltage
The CBCT’s input voltage range is from 20 to 300 Vdc. The input circuit is also protected from a
reversed polarity connection.
Output Voltage
The output voltage is programmable from 5% to 95% of the input voltage and is set using the
dial on the front panel. Output voltage regulation is better than 2% under load. Two DC outputs
are available on the CBCT. The continuous DC output is capable of sourcing current up to 40
amperes. The pulse DC output is capable of sourcing up to 80 amperes for up to 500 milliseconds. Both outputs are protected against short-circuit conditions if the test current exceeds
80 amperes or if the drawing duration is more than 500 milli-seconds.
CBCT Status Display
The CBCT features a back-lit LCD screen (20 characters by 4 lines) that is viewable in both bright
sunlight and low-light levels. The input and output voltages are displayed on the screen during
testing. If a power supply fault condition occurs, a red “FAULT” LED light is illuminated on the
front panel and a corresponding message is displayed on the LCD screen.
CBCT Timer
The built-in, single channel timer can be used to verify circuit-breaker timing parameters or for
any timing application. The timing range is from 0.000 to 999.000 seconds with an accuracy of
0.1 milli-seconds. The timing results are displayed in both milli-seconds and cycles. The timer
can be started by circuit-breaker coil initiation or can be triggered by the dry or wet contact
input. The timer can be stopped by either the dry or wet contact input.
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