Datasheet

Application
The digital Weigel Power Meters WPM 770 have been designed to dis-
play the electrical parameters in low voltage and middle voltage sys-
tems. The meters are suitable for use in 3 - phase 3 - wire or 3 - phase
4 - wire systems 230/400 V and for use with current transformers N/5 A.
Features
D Real- time true - RMS measurement:
Voltages phase to neutral and phase to phase of the 3 phases as well
as mean value, minimum/maximum values, unbalance and deviation
from nominal value; currents of 3 phases and mean value, neutral
current, minimum/maximum values; phase sequence; frequence and
frequence deviation; active power, reactive power, apparent power,
and power factor of the 3 phases and in total
D Programmable demand calculation for currents and powers (fixed
block or rolling block, demand time can be set to 5; 10; 15; 30 min)
D Active energy and reactive energy in 4 quadrants (imported/exported,
inductive/capacitive), 4 tariffs for energies in up to 8 periods in 24
hours in 2 time zones, working days and holiday days can be set
D Harmonic analysis of voltages, currents, powers, and energies up to
the 31
st
harmonics as well as total harmonic distortion (THD)
D Built- in clock and event logging
D Alarms for upper and lower setpoints
D 2 relay outputs and 3 status inputs
D RS485 interface (Modbus - RTU)
D Up to 3 optional modules for additional interfaces, additional relay
outputs and status inputs, pulse outputs, analogue inputs, analogue
outputs, as well as memory extension
Using the four buttons on the front panel, the measured values can be
selected and settings can be programmed.
Functional Principle
WPM 770 is a microprocessor-controlled digital measuring device for
measuring, calculating, and indicating electrical ratings.
The meter has 3 voltage inputs and 3 current inputs to enable simulta-
neous evaluation of voltage, current and power for all three phases.
General Technical Data
Case
case details suitable to be mounted in switch gear panels
material of case plastics, black
panel fixing plastic clips
enclosure code IP 54 front of case
IP 30 rear of case
insulation voltage 2 kV AC
inputs – outputs – auxiliary supply
pulse withstand 4 kV (peak), 1.2/50 mS
voltage
insulation resistance ≥50 MW
Terminals plugable screw-terminal barrier strips
wire-cross section 2.5 mm
2
max.
Dimensions basic unit with optional module
bezel V 96 mm
bezel height 13.5 mm
panel cutout V 90
+0.5
mm
mounting depth 45.1 mm 66.6 mm
panel thickness
5 mm
weight approx. 0.4 kg
Electrical Data
system type 3 - phase 3 - wire or 3 - phase 4- wire system,
unbalanced loads
rated voltage 240/415 V directly connected
rated current N/5 A via CT
CT primary value adjustable from 1 to 9999 A
overload capacity
current 1.2 times continously
10 times for 1 sec.
voltage 1.2 times continously
2 times for 1 sec.
rated frequency 50 Hz
frequency range 45 ... 65 Hz
operating voltage 300 V
measurement category CAT III
Display/Measuring/Accuracy
Display LCD display, 70 mm x 55 mm
with backlight (when pressing a button)
Measured quantities (repetition time 1 s)
voltages U L-L, L-N and mean value,
unbalance, max./min. values,
deviation recording
currents I L1, L2, L3, N and mean value,
max./min. values
frequency F frequency, deviation
active power P L1, L2, L3, and SP
reactive power Q L1, L2, L3, and SQ
apparent power S L1, L2, L3, and SS
power factor PF L1, L2, L3, and in total
active energy L1, L2, L3, and in total, imported and exported
reactive energy L1, L2, L3, and in total, inductive and capacitive
maximum demand for I
L1
, I
L2
, I
L3
and SP, SQ, SS
demand time adjustable to 5; 10; 15; 30 min
individual harmonics for U, I, SP and energy up to the 31
st
harmonics
total harmonic distortion (THD) for U and I
Measuring unit Display rangeResolutionAccuracy
voltages directly 0 ... 500 V L-L 0.01 V 0.2%
voltages via VT 0 ... 65 kV primary
currents directy 0 ...1 A/5 A 0.001 A 0.2%
currents via CT 0 ... 9999 A
powers each phase 0 ... ±649.9 M✸ 0.1 ✸ 0.5%
total powers 0 ... ±1949.9 M✸ (✸ = W/var/VA)
power factor –1 ... +1 ... –1 0.001 0.5%
frequency 45 ... 65 Hz 0.01 Hz 0.1%
active energy
*
) 0 ... 99,999,999.9 kWh 0.1 kWh 1.0%
reactive energy
*
) 0 ... 99,999,999.9 kVarh 0.1 kVarh 2.0%
unbalance rate 0 ... 100.0% 0.001 1.0%
individual harmonics 0 ... 100.0% 0.001 1.0%
THD 0 ... 100.0% 0.001 1.0%
*
) The accuracy for energy measurement is class 1
according to IEC 62053–21.