Relay Engineering Services Limited
625 East Bunker Court Vernon Hills, IL 60061-1844 Toll-free: 800-358-5525
Overview
Concept
Specifications
Specifications – cont.
www.relayeng.com
Power Systems Protection Test Equipment
TCT2 Breaker Trip Coil Tester with Timer
Designed specifically to enable HV circuit breaker
trip coils to be tested at a reduced volt age
• Considerably safer than traditional
methods
• Powered directly from the substation
battery
• Output precisely settable from 5 to 95%
of battery voltage
• Electronic regul ation ensures guaranteed
constant voltage during testing
• 80 A current capable
To ensure that circuit breaker operation is guaranteed under the
most onerous condi tions placed on the substation tripping s upply,
circuit breaker trip coils are specified to work with a minimum
tripping voltage much below the nominal battery voltage. The
minimum trip voltage test is described in a number of int ernational
and national standards such as I EC 56, ANSI C37.09 etc.
Traditionally, this test was performed by tapping the main t ripping
battery. This method however should not be utilized
considerable risk to testing personnel, battery and breaker being
tested.
General-purpose DC sources as well as variac-based instruments
are also unsuitable due to their inability to maintain their output
voltage precisely regulated at the high peak currents drawn by
trip coils.
The TCT2 is essentially a very high-speed electronic voltage
regulator which will accurately maintai n the output voltage c onstant
while very high peak currents are drawn, for a period long enough
to allow the operation of the trip coil. An independent regulation fail
detection circuit ens ures t hat t he precis e level of tes t volt age during
the entire test is always known and guaranteed constant.
The automatic trip-coil burnout protection feature protects the
breaker trip coil from thermal damage which can occur during
breaker malfunction. The integrated general-purpose Start/Stop
timer can be used to dis pl ay the breaker operating times.
Input Voltage
20 to 280 VDC
(Works with all t ri ppi ng supply voltages used worldwide)
Output Voltage
5 to 95% of input voltage
(User settable via mult i -t urn di al )
as it presents a
• Trip-coil burnout protection
• Integrated Start/Stop timer
Output Voltage Regulation
Better than 2% up to max current
Output Current
80 A max (protective shutdown at > 80 A)
Protections
Reverse polarity
Short circuit / Overload
External voltages on output
Trip-Coil Burnout Protection
Shutdown and warning when trip-coil draws current
continuously for > 500 msec
Regulation Fail Detection
Independently monitors output and warns user if output
voltage did not remain within 2% of set value for whatever
reason.
Voltmeter
0 to 300.0 VDC measuring range. LCD with backlight.
Accuracy: reading ±0.2V
Measures both Input and Output voltages
Software-based calibration.
Timer
Range: 0.000 to 999.999 secs. LCD with backlight.
Accuracy: (crystal controlled) ±100ppm. ±1 digit.
Start Input: selec table as Internal (start on Pul s e output)
or external voltage or contact (dry/wet)
sensing, normally open or normally closed.
Stop Input: select abl e as external voltage or contact
(dry/ wet) sensing, normally open or
normally closed.
Input Voltage mode range: 3 to 300 VDC
Input Contact mode range: < 200 Ω
Physical
Case: IP65 Rated (case cl osed), 3 mm Aluminium Shell
Size: 308 x 206 x 206 mm
Weight: 8.0Kg
Environmental
0 to 50°C operating temperature, -10 to 60ºC storage
temperature, 10 to 90% RH ( non condensing)
Fax: 800-433-9971 E-mail: info@davis.com www.davis.com
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