PEWM-3CF Portable three-phase energy standard class 0.1/ 0.2 (for quick check of electricity meters and current transformers)

PEWM3CT Portable three-phase energy standard class 0.1/ 0.2

The three-phase energy standard PEWM-3CF is intended for a quick test on site of all types electricity meters for active, reactive or apparent energy, two-, three- or four-wire connection. Three voltages and three currents are measured at the same time. The current can be measured either via a direct connection up to 10A (class 0.1), or with with three electronically compensated current clamps to 120A or 150A (class 0.2). As an option three primary current clamps to 1000A or flexible current probes up to 2000A or 3000A can be ordered.

Error of the electricity meter can be determined. The electricity meter disc revolutions or pulses can be counted with an universal scanning head (type EH 11) or manually with the help of a functional button. The registers of the electricity meter can be tested, too, a preliminary quantity of energy being preset in this latter case.

Another function of the device is a vector diagram display and an indication of the numerical values of current, voltage, phase shift, frequency, voltage sequence; This helps the control of the proper connection of electricity meters, motors, and other three-phase circuit components. The screen display of the vector diagram can be changed by the operator for 4-wire or 3-wire measurement; The phase-to-phase voltages are indicated in the latter mode.

Other functions of the device are power, cos φ and harmonic distortion measurement; drawing of two input signals in real time (two beam oscilloscope). With the help of the primary current sensors, the transformation ratio of current transformers can be determined. The error of the whole measuring circuit (CTs + meter) can be measured.

The device is powered from the voltage measuring circuit or from an auxiliary supply. 100 screen displays of error, current transformer or vector diagram measurement can be memorized in a non-volatile memory and transferred to a computer via RS232C. A thermal printer can be connected to the RS232C output of PEWM-3CF to print the measuring results.

TECHNICAL DATA OF PEWM-3CF

Power Supply
auxiliary 220 V ±15 %; 45 ... 65 Hz
from the measuring circuit 45 ÷ 480 V (phase-to-phase or phase-to-neutral)
Power consumption max 15 VA
Dimensions 220x130x75 mm
Weight 1.4 kg
Housing plastic
Operation temperature -10°C ÷ +50°C
Storage temperature -20°C ÷ +60°C
Temperature coefficient 100 ppm / °C
Relative humidity Max 95% at 25 °C, non condensing
Pulse output 50 000 imp/ kWh (kVarh)(programmable)
Back lit LCD display 160x128 pixels
Degree of protection IP52
Jaw capacity of 120 A CC 12 mm diameter
Jaw capacity of 150 A CC 20 mm diameter
Jaw capacity of 1000 A CC 52 mm diameter

MEASUREMENT RANGES

Range of voltage (phase-neutral) 5.000 ÷ 300.00 V
Range of voltage (phase to phase) 8.66 ÷ 485.00 V
Range of current (10 A direct) 0.01 ÷ 10.00 A
Range of current (120 A CC) 0.01 ÷ 120.00 A
Range of current (1000 A CC) 0.50 ÷ 1000.00 A
Range of current (2000 A flex) 1.00 ÷ 2000.00 A
Range of phase angle 0.0° ÷ 359.9°
Range of frequency 40.000 ÷ 70.000 Hz
Range of power factor -1.00 ÷ +1.00

MEASUREMENT ERROR

ERROR RANGE
Voltage(phase-neutral) ± 0.05 % 50.00 ÷ 300.00 V
± 0.2 % 5.00 ÷ 49.99 V
Current (10 A direct) ± 0.05 % 0.05 ÷ 10.0 A
Current (120 A CC) ± 0.2 % 0.100 ÷ 120.0 A
Current (150 A CC) ± 0.2 % 0.200 ÷ 150.0 A
Current (1000 A CC) ± 0.2 % 5.000 ÷ 1000.0 A
Current (2000 A flex or HV) ± 1.0 % 10.00 ÷ 2000.0 A
Active/apparent power/energy (10 A direct) ± 0.1 % 0.050 ÷ 10.0 A
Active/apparent power/energy (120 A CC) ± 0.2 % 0.100 ÷ 120.0 A
Active/apparent power/energy (150 A CC) ± 0.2 % 0.200 ÷ 150.0 A
Active/apparent power/energy (1000 A CC) ± 0.2 % 5.000 ÷ 1000.0 A
Reactive power/energy (10 A direct) ± 0.2 % 0.050 ÷ 10.0 A
Reactive power/energy (120 A CC) ± 0.4 % 0.100 ÷ 120.0 A
Reactive power/energy (150 A CC) ± 0.4 % 0.200 ÷ 150.0 A
Reactive power/energy (1000 A CC) ± 0.4 % 5.000 ÷ 1000.0 A
Frequency ± 0.01 Hz 40.00 ÷ 70.00 Hz
Power factor ± 0.1 % -1.00 ÷ +1.00
Phase angle ± 0.1° 0.0° ÷ 359.9°

Note: All power/energy errors are related to apparent power/energy (to be divided by power factor)

SAFETY TESTS :

EN 61010-1; Transient over-voltage category III; Degree of pollution 2

EMC TESTS :

EN 61000-4-2, EN 61000-4-4; EN 61000-4-5, EN 61000-4-6

FUNCTIONALITY:

EN 60736; EN 62053, EN 60044-1

MEASUREMENT CATEGORY III, 300VAC

FUNCTIONS OF PEWM-3CF

General measurement

General measurement

The vector diagram of voltages and currents is drawn on the large graphic display in this mode. The true RMS values of voltage and current, the angle between them, the angle between phase voltages for each phase; the frequency and sequence of rotation are also indicated. This mode can be switched for three-wire of four-wire measurement.

Error measurement

Error measurement

The device indicates the electricity meter error in [%] and the true value of energy in this mode. The delivery of pulses is traced with a bar-graph.

The pulses or revolutions number "R", the constant of the electricity meter "C" and the transformation ratio "P/S" are preset by the operator.

The measurement can be changed for two-, three- or four wire connection, for active or reactive energy. The operator can enter the pulses manually or with the help of a scanning head.

Register error measurement

The value of energy is preset in this mode. The measurement is started and stopped by the operator using the relevant button. The error of the register is indicated in [%].

Phase shift measurement

The phase angles between two voltages and between voltage and current are indicated in this mode. The power factors of the three phases and the total power factor are also displayed. The measurements are renewed every 2 seconds.

Power measurement

Power measurement

The phase angles between two voltages and between voltage and current are indicated in this mode.

The power factors of the three phases and the total power factor are also displayed.

The measurements are renewed every 2 seconds.

Transformation ratio

The harmonic content of each input signal of voltage or current can be measured in this mode. The amplitude in [%] of the 1st harmonic and the initial phase of the odd harmonics up to the 29th are indicated. The value to expand into harmonics is determined by the operator among the 6 input signals. The measurement and the corresponding screen display are renewed every two seconds.

Harmonics

Harmonics

The harmonic content of each input signal of voltage or current can be measured in this mode. The amplitude in [%] of the 1st harmonic and the initial phase of the odd harmonics up to the 29th are indicated. The value to expand into harmonics is determined by the operator among the 6 input signals. The measurement and the corresponding screen display are renewed every two seconds.

Oscilloscope

Oscilloscope

Two signals are drawn on-line on the display. The operator selects the signals. Near the waveforms, the true RMS value of the corresponding signal in [V] or [A] is displayed.

Memory

200 electricity meter or current transformer measurements can be stored in a non-volatile memory, and transferred to a computer via RS 232.

The following data are stored: number of electricity meter (alpha-numerically); the current, voltage, and power factor values of the three phases; error of the electricity meter; the transformation ratio, regime.

The program in the computer works under Windows 95, 98 and has the following features: printing of protocol; archive file organization data search from the archive.