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The DVS3 mk2 is smaller, lighter, higher power
version of the T&R DVS3, offering more than twice the output power
of the original DVS3.
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
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.
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Features
- 3-Φ Voltage output from 1-Φ supply.
- 0 to 133V Φ-N output voltage, 0 to 266V
or 0 to 292V Φ-N with optional VT box.
- 45VA/phase maximum output.
- Variable Frequency 40 to 999.9Hz.
- Phase shift ±180°.
- Multi-functional timing system.
- Ideally suited to testing G59 schemes.
- Step change of phase and df/dt.
- Large back-lit liquid crystal display.
- Compact and lightweight.
- Automatic mains voltage selectable.
DVS3 Mk2 Specifications
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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.
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 information. A graphical vector
diagram is shown, as is the state of the two contact inputs. |
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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:
In conjunction with a current source (such as the
200ADM or
50A-3PH) the DVS3 mk2 can be used to test protection requiring
current injection with a phase-shiftable voltage including:
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Directional relays.
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Distance protection.
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Phase angle relays.
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Power relays.
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Power transducers.
50A-3PH/ DVS3 mk2 Combined Data Sheet (PDF)
(documents are in PDF format and will open in a new
window) |
DVS3 mk2 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.
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Frequency Resolution
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0.01Hz
0.1Hz |
40.00 to 99.99Hz
100.0 to 999.9Hz |
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Frequency Accuracy |
±0.01%
of reading +1 digit |
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Phase Resolution |
0.1° |
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Phase Accuracy |
±0.3°
phase to phase |
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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.
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Phase Lock Range |
45 to 65Hz |
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External Voltage Ref. |
20V AC to 250V AC |
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External Current Ref. |
0.2 to 5A AC |
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Phase Resolution |
0.1° |
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Phase Accuracy
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±0.3°
phase to phase
±0.3°
reference to output |
df/dt and ROCOF (Rate
Of Change Of Frequency)
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Frequency Range |
45.00 Hz to 65.00Hz |
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Default Sweep Range |
49.75 to 50.25Hz (50Hz supply)
59.75 to 60.25Hz (60Hz supply) |
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Rate of Change Range |
0.010 to 2.000Hz/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.
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