HT instruments VEGA78 - Manual (Page 108)

VEGA78
EN - 106
7. MEASURING PROCEDURES
The instrument’s accuracy is grant only for the following system configuration:
 Single Phase systems (Phase, Neutral, Ground).
 Three Phase 4 wires systems WYE + Ground.
 Three Phase 3 wires systems DELTA + Ground.
7.1. USING OF METER IN A SINGLE PHASE SYSTEM
CAUTION
 The maximum voltage among B1, B2, B3, B4 and BE inputs is 1000V /
CAT IV 600V to ground. Do not measure voltages exceeding the limits
prescribed by this manual. Should you exceed the voltage limits you
could damage the instrument and/or its components or endanger your
safety.
 If possible, before connecting the meter to the electrical equipment to be
tested turn the power supply off.
Fig. 185: Meter connection in a Single phase system
1. Check and modify the basic settings of meter if necessary (see § 5.3.1). Set SINGLE
system option.
2. Connect voltage test leads on Phase, Neutral and Ground cables considering the colours
as shown in Fig. 185).
3. Connect the transducer current clamp on L1 Phase cable as shown in Fig. 185) respecting
the clamp’s arrow direction indicating the current standard sequence from generator to
load. On Real Time Values’ section screens always verify the positive value of
Active Power and the power factor relative to load which should be normally
inductive before starting a recording. Reverse the clamp by 180 degrees on cables in
case of negative readings.
4. Supply the electrical installation under test in case this was temporarily put out of
service for meter connection. The values of parameters are shown by meter at display
in Real Time Values section (see § 5.2).
5. Press SAVE key if an instantaneous sample of display values (Instant) should be
saved (see § 5.5). Use HOLD function to stop the values at display if necessary.
6. Check all settings before start a recording (see § 5.4). Press GO/STOP key to enable
and disable a recording on meter (see § 5.4.10).