Atec T-R-DVS3 User Manual

DVS3 mk2 Relay Test System

Features

• 3-φ Voltage output from 1-φ supply

• 0-133V φ-N output voltage
0-266V/292V φ-N with optional VT box

• 45VA/phase maximum output

• Variable Frequency 40-999.9Hz

• Phase shift ±180.0°

• Multi-function timing system

• Ideally suited to testing G59 schemes

• Step change of phase and df/dt

• Large back-lit liquid crystal display

• Compact and lightweight

Optional 260V

VT box

The DVS3 mk2 is the new smaller, lighter, higher power
version of the T&R DVS3, offering three times the output
power of the original DVS3. The exceptionally easy to
understand user interface of the DVS3 is retained, allowing
simple testing of complex voltage and loss of mains
protection systems.

Equally at home in a commissioning, maintenance, or
laboratory environment, the DVS3 mk2 is a truly flexible
system. The DVS3 mk2 has been designed using the latest

The display on the DVS3 is back-lit and exceptionally

clear. Menu options on the left are selected by dedicated

buttons on the panel next to the display, allowing

immediate access to adjust voltage, phase and frequency.

Phase to phase and phase to neutral voltages are both

shown on the display, along with frequency and phase

• Automatic mains voltage selection

The DVS3 mk2 is ideally suited to testing G59 protection,
including loss of mains protection. Vector surge and df/dt
(ROCOF) relays may be simply tested and timed, as can
other protection requiring one to three voltages, including:

• Under and over frequency relays

• Under and over voltage relays

• Synchronising relays

• df/dt & ROCOF relays

• Vector surge relays

• Transducers

digital technology to generate a highly stable and accurate
output with very low distortion. Each phase output is
individually adjustable for voltage and phase angle. In
addition, full control of frequency is available. Step changes
of any quantity may be generated with automatic timing of the
response of the relay under test.

The unit is controlled by a simple user interface with context
sensitive menus. Values may be either typed in at the
keypad or smoothly varied using a digital potentiometer.

In conjuction with a current source (such as the 200ADM),
the DVS3 mk2 can be used to test protection requiring
current injection with a phase-shiftable voltage including:

• Directional relays

• Power transducers

• Distance protection

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.

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.

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.

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.

29/04/03 DVS3 mk2 Data Sheet Rev 2

T&R Test Equipment Ltd, Keens Lane, Worplesdon, Guildford, Surrey, GU3 3LS, UK

Tel: [phone] Fax: [phone] email: [e-mail]

www.trtest.com

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 values 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.