PEWM-3C Portable three-phase energy standard class 0.1/ 0.2 (for quick check of electricity meters and current transformers)
The three-phase energy standard PEWM-3C 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 is measured with three electronically compensated current clamps to 100A. Error of the electricity meter can be determined. The electricity meter disc revolutions or pulses can be counted with a 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 and phase shift; 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 &phi and harmonic distortion measurement; drawing of two input signals in real time (two beam oscilloscope). The device is powered from the voltage measuring circuit or from an auxiliary supply. 200 screen displays of error, current transformer or vector diagram measurement can be memorized in a non-volatile memory and transferred to a computer via RS 232.
TECHNICAL DATA OF PEWM-3C
| Power Supply | |
| auxiliary | 86-275V |
| from the measuring circuit | 57V ÷ 450V(phase-to-neutral) |
| Power consumption | max 5 VA |
| Dimensions | 220 x 130 x 60 mm |
| Weight | 1.4 kg |
| Housing | plastic |
| Operation temperature | -10°C ÷ +50 °C |
| Relative humidity | Max 95% at 25 °C, non condensing |
| Pulse output | 50 000 imp/ kWh (kVarh)(programmable) |
| Back lit LCD display | 160 x 128 pixels |
| Degree of protection | IP52 |
| Jaw capacity of 100A CC | 12 mm diameter |
MEASUREMENT RANGES
| Range of voltage(phase-neutral) | 5.000V ÷ 280.00V |
| Range of voltage(phase to phase) | 8.66V ÷ 485.00V |
| Range of current (100A CC) | 0.01A ÷ 100.00A |
| Range of phase angle | 0.0° ÷ 359.9° |
| Range of frequency | 40.000Hz ÷ 70.000Hz |
| Range of power factor | -1.00 ÷ +1.00 |
MEASUREMENT ERROR
| ERROR [%] | RANGE | |
| Voltage(phase-zero) | ± 0.1 | 50.00V ÷ 280.00V |
| ± 0.2 | 5.00V ÷ 49.99V | |
| Current (100A CC) | ± 0.2 | 0.100A ÷ 100.0A |
| Active power/energy (100A CC)* | ± 0.2 | 0.100A ÷ 100.0A |
| Apparent power/energy (100A CC) | ± 0.2 | 0.100A ÷ 100.0A |
| Reactive power/energy (100A CC)* | ± 0.4 | 0.100A ÷ 100.0A |
| Frequency | <± 0.02Hz | 45.00Hz ÷ 65.00Hz |
| Power factor | <± 0.02% | -1.00 ÷ +1.00 |
* related to apparent power/energy
SAFETY TESTS :
ACCORDING TO EN 61010-1 , IEC 61010-2-032EMC TESTS :
ACCORDING TO EN61000-4-2, EN61000-4-4 , EN61000-4-5, EN61000-4-6FUNCTIONALITY:
ACCORDING TO IEC 60736MEASUREMENT CATEGORY III
ACCESSORIES
| - Voltage cables . 2 m (4 units) | - PEWM-3C Software | - Hand switch |
| - Optical scanning head | - Instructions Manual | - Transport Case Peli.1430 |
| - Compensated clamp-opn CTs 100 A | - Crocodile clips | - Power supply cable |
FUNCTIONS OF PEWM-3C
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
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
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
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
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.