Atec T-R-DVS3 - Manual (Page 2)

DVS3 mk2 Specification
Output
The output of the DVS3 mk2 has four 4mm safety sockets for
phases A, B, and C and neutral. The neutral connection may be
omitted for a delta connection.
Voltage 0-133Vac phase-neutral
0-230Vac phase-phase
Current (continuous) 200mA at 133V, 120mA at 0.1V*
Current (5min on/ 15min off) 335mA at 133V, 200mA at 0.1V*
Voltage resolution 0.1V phase-neutral
Phase rotation ±180º
Voltage accuracy ±0.3%rdg+3d
*The current trip drops linearly between maximum and minimum output voltage. All
output ratings are based on an ambient temperature of 25°C.
Timing System
The timing system on the DVS3 mk2 is flexible and transparent
in operation. Step changes of any quantity may be generated by
typing in value using the keypad. Entering a value in this way
automatically resets and starts the timer when the change is
applied. The timer then stops on a change of state of either
contact input. More complex timing functions are handled by the
PF-F-PF mode.
Two contact inputs are provided, both of which have LEDs and a
mimic on the display to show the contact state. The contact
inputs auto-select for normally open or normally closed contacts.
A DC voltage can also be used to trigger the timer using the Vdc
contact.
Timer resolution 1ms
Timer full scale 999.999s
Timer accuracy ±0.01%rdg+2d
Contact O/C voltage 24V
Contact S/C current 20mA
Vdc input range 24-240Vdc
Protection and Safety
The DVS3 mk2 is CE marked and is designed to meet the
requirements of BS EN61010. The outputs are protected by
overcurrent and thermal trips, and the contact inputs are
protected by PTC thermistors. The phase lock current input is
fuse protected, and the voltage input is impedance protected.
An earth terminal is provided for connection to a local earth.
Supply Requirements
115V/230V±10%±10% auto-selecting, 45-65Hz 1ph 425VA max
Temperature Range
Storage -20°C to 60°C Operating 0°C to 45°C
Lead Set Specifications
1 x 3m 4 core output lead terminated in 4mm plugs
1 x 3m 2 core timer lead terminated in 4mm plugs
Dimensions Weight
380mm x 314mm x 221mm 9.1kg
Accessories
Output lead set, lead set case, mains lead, spare fuse set,
operating manual.
Optional Accessories
Printer, 133:266V step up VT box, 133:292V step up VT box.
Modes of Operation
Variable Frequency Mode
This mode allows full control of frequency, voltage and phase.
The voltage and phase may be controlled individually for each
phase or for all three phases together. All parameters are
continuously variable using the adjust control, and step changes
of any value may be generated by typing the required value on
the keypad. The new value is applied to the output when the
enter key is pressed. The timer automatically resets and starts
when a step change of value is entered, and stops if either
contact input changes state. Step changes of phase for testing
Vector Surge relays are easily generated in this mode.
Frequency resolution 0.01Hz 40.00-99.99Hz
0.1Hz 100.0-999.9Hz
Frequency accuracy ±0.01%rdg+1d
Phase resolution 0.1º
Phase accuracy ±0.3º phase to phase
Phase Lock Mode
The frequency and phase of the output are controlled by an
external reference in phase lock mode. The reference may be
the mains supply to the DVS3 mk2, an external voltage, or an
external current. This mode allows testing of directional and
distance protection in conjunction with an external current
source.
Phase lock range 45-65Hz
External voltage ref. 20-250V AC
External current ref. 0.2-5A AC
Phase resolution 0.1º
Phase accuracy ±0.3º phase to phase
±3.0º reference to output
df/dt and ROCOF (Rate Of Change Of Frequency)
Loss of mains protection often takes the form of a df/dt relay,
sensitive to the rate of change of frequency over time. The
DVS3 MK2 is able to generate a swept frequency output with
accurate rates of change of frequency between preset
frequencies. The rate of change may be continuously varied to
find the relay setting or stepped to time the relay. The output
may be set to either sweep continuously or generate single
sweeps with timing.
Frequency range 45.00-65.00Hz
Default sweep range 49.75-50.25Hz (50Hz supply)
59.75-60.25Hz (60Hz supply)
Rate of change range 0.010-3.000Hz/s
Pre-fault - Fault - Post-fault Mode
PF-F-PF mode allows extra flexibility in testing where complex
events must be timed or several sets of values must be applied
to a relay in turn. This mode allows three sets of v alues to be set
in advance (pre-fault, fault, and post-fault values). The DVS3
MK2 may be set to switch from one state to the next on a change
of contact or after a specific time. In addition, the timer may be
set to start or stop on any one of the state changes of a change
of contact state. This mode allows frequency, phase and voltage
to be changed simultaneously if required.
Note: Due to the company’s continuous research programme, the information above may change at any time without prior notificatio n. Please check that you have the most recent data on the product.
T&R Test Equipment Ltd, Keens Lane, Worplesdon, Guildford, Surrey, GU3 3LS, UK
Tel: +44 (0)1483 235757 Fax: +44 (0)1483 235759 email: [email protected]
www.trtest.com
29/04/03 DVS3 mk2 Data Sheet Rev 2