AC Phase Angle Measurement
- Phase angle in degrees indicates the phase lead or lag between two periodic signals of the same period, as determined from their zero crossings. These two signals will typically be the voltage and current applied to a load. As illustrated, the phase angle θ in degrees is +360*P1/P.
- The Laureate™ Phase Angle & Power Factor Meter computes phase angle θ by timing zero crossings of two signals applied to Channels A and B. The phase angle range is selectable as 0° to 360° or -180° to +180°. Resolution is selectable as 1°, 0.1° or 0.01°. Typical accuracy is 0.01% from 1 Hz to 100 Hz, 0.1% at 1 kHz, and 1% at 10 kHz.
AC Power Factor Measurement
- The power factor of an AC power system is the ratio of real power in watts (W) divided by apparent power in volt-amperes (VA). For sinusoidal signals differing by a phase angle θ, power factor is cos(θ).
- The Laureate™ Phase Angle & Power Factor Meter computes power factor as cos(θ) from phase angle θ. Power factor readings can range from 1.000 to 0.000 with three decimal places and an accuracy of 0.1% for sinusoidal signals at 50/60 Hz power line frequency. While power factor is always positive, the meter artificially assigns a minus sign to power factor for negative phase angles, and it sets power factor to 0 for phase angles greater than 90°.
Designed for flexibility
The Laureate Phase Angle & Power Factor Meter utilizes the Laureate Extended counter main board and the FR dual-channel signal conditioner board, which accepts AC signals from 12 mV p-p to 250 Vrms. Optional plug-in boards for communications and control include Ethernet and other serial communication boards, dual or quad relay boards, and single or dual isolated analog output boards. Laureates may be powered from 85-264 Vac or optionally from 12-32 Vac or 10-48 Vdc. The display is available with red or green LEDs. The 1/8 DIN case meets NEMA 4X (IP65) specifications from the front when panel mounted. Any setup functions and front panel keys can be locked out for simplified usage and security. All power and signal connections are via UL / VDE / CSA rated screw clamp plugs.
Features
- Programmable to read phase angle or power factor with two waveshapes of identical period
- Phase angle resolution of 1°, 0.1° or 0.01° and accuracy of 0.03° at AC line frequency
- Power factor from 1.000 to 0.000 with sinusoidal signals
- Accepts AC signals from 1 Hz to 10 kHz at voltages up to 250 Vrms
- Universal 85-264 Vac / 90-300 Vdc or 10-48 Vdc / 12-32 Vac powerr
- Transducer excitation output (isolated)
- Wide choice of options:
- 2 or 4 relays, mechanical or solid state (isolated)
- 1 or 2 analog outputs (isolated)
- Serial data I/O: Ethernet, USB, RS485, RS232 (isolated)
Specifications
AC Power Factor Meter & AC Phase Angle Meter
| Phase Angle Mode | |
|---|---|
| Item Displayed | Phase angle difference between two waves of same period |
| Display Units | 1°, 0.1°, 0.01° |
| Frequency Range | 0.005 Hz to 10 kHz |
| Resolution | 0.01°, 1 Hz to 100 Hz; 0.1° at 1 kHz; 1° at 10 kHz |
| Accuracy | 0.05° at 50 or 60 Hz |
| Maximum Timing Interval | 200 sec |
| Power Factor Mode | |
| Item Displayed | Power factor between two sine waves of same period |
| Display Units | 1.000 to 0.000 |
| Polarity | Negative sign indicates negative phase angle |
| Frequency Range | 0.005 Hz to 10 kHz |
| Accuracy | 0.1% at power line frequencies |
| Update Rate | |
| Timing Interval | Gate time + 30 ms+ 0-2 signal periods |
| Gate Time | Selectable 10 ms to 199.99 s |
| Time Before Zero Out | Selectable 10 ms to 199.99 s (to indicate loss of signal) |
| Display | |
| Readout | 6 LED digits, 7-segment, 14.2 mm (.56"), red or green. |
| Range | -999999 to +999999 |
| Indicators | Four LED lamps |
| Inputs | |
| Signal ranges | Nine AC signal ranges from 12 mVp-p to 250 Vac |
| Signal ground | Common ground for channels A & B |
| Noise filter | 1 MHz, 30 kHz, 250 Hz (jumper selectable) + digital filter |
| Power | |
| Voltage, standard | 85-264 Vac or 90-300 Vdc |
| Voltage, optional | 12-32 Vac or 10-48 Vdc |
| Frequency | DC or 47-63 Hz |
| Power consumption (typical, base meter) | 1.2W @ 120 Vac, 1.5W @ 240 Vac, 1.3W @ 10 Vdc, 1.4W @ 20 Vdc, 1.55W @ 30 Vdc, 1.8W @ 40 Vdc, 2.15W @ 48 Vdc |
| Power Isolation | 250V rms working, 2.3 kV rms per 1 min test |
| Excitation Output (standard) | |
| 5 Vdc | 5 Vdc ± 5%, 100 mA |
| 10 Vdc | 10 Vdc ± 5%, 120 mA |
| 24 Vdc | 24 Vdc ± 5%, 50 mA |
| Output Isolation | 50 Vdc to meter ground |
| Analog Output (optional) | |
| Output levels | 4-20 mA, 0-20 mA, 0-10V, -10 to +10V (jumper selectable) |
| 4-20 mA, 0-20 mA, 0-10V (dual-output option) | |
| Current compliance | 2 mA at 10V ( > 5 kΩ load) |
| Voltage compliance | 12V at 20 mA (< 600Ω load) |
| Scaling | Zero and full scale adjustable from -99999 to +99999 |
| Resolution | 16 bits (0.0015% of full scale) |
| Isolation | 250V rms working, 2.3 kV rms per 1 min test |
| Relay Outputs (optional) | |
| Relay types | 2 Form C contact relays or 4 Form A contact relays (NO) 2 or 4 Form A, AC/DC solid state relays (NO) |
| Current Ratings | 8A at 250 Vac or 24 Vdc for contact relays 120 mA at 140 Vac or 180 Vdc for solid state relays |
| Output common | Isolated commons for dual relays or each pair of quad relays |
| Isolation | 250V rms working, 2.3 kV rms per 1 min tes |
| Serial Data I/O (optional) | |
| Board selections | RS232, RS485 (dual RJ11 or RJ45 connectors), USB, Ethernet, USB-to-RS485 converter, Ethernet-to-RS485 converter |
| Protocols | Modbus RTU, Modbus ASCII, Modbus TCP (Ethernet), Laurel ASCII |
| Data rates | 300 to 19200 baud |
| Digital addresses | 247 (Modbus), 31 (Laurel ASCII), |
| Isolation | 250V rms working, 2.3 kV rms per 1 min test |
| Environmental | |
| Operating temperature | 0°C to 55°C |
| Storage temperature. | -40°C to 85°C |
| Relative humidity | 95% at 40°C, non-condensing |
| Protection | NEMA-4X (IP-65) when panel mounted |
| Electrical Connections | |
 | |
Applications
| Optimizing Meter Inputs for Phase Angle & Power Factor Measurement |
|---|
|
Phase angle and power factor measurement with the Laureate™ Phase Angle & Power Factor Meter require that two signals of identical periods be applied to Channels A and B. For best accuracy, both signals should have the same amplitude, the signal amplitude should be larger than 1V, and the trigger level should be minimized by selecting the ±12 mV jumper position. The meter times zero crossings to 0.1 µs resolution over a user-selectable gate time from 10 ms to 199.99 s. By selecting the minimum gate time of 10 ms, the meter update rate will be approximately 20/s for 50/60 Hz AC line frequency. Improved accuracy will be obtained by making the gate time long enough so that multiple cycles are averaged. Both signals applied to the meter should be mutually isolated by transformer coupling, so that they can then share the same ground in the meter. The current signal is typically obtained from a current transformer (CT). This should ideally be a CT with a voltage output or a current output in the mA range, which can then be converted to a voltage higher than 1V across an external dropping resistor without excessive heat generation. |
| Using Laureate Meters and Counters to Synchronize Motor Generators |
|
Synchronization of two motor generators requires that the two frequencies be identical, that the lines be in phase, and that the line voltages be close to each other. In this illustration, a single Laureate dual channel counter measures both frequencies to six-figure accuracy in a few line cycles. Another Laureate dual channel counter measures phase angle to 0.1° resolution. Two Laureate AC RMS Voltmeters, which offer ranges of 200.00 V and 600.0 V, are used to display the two RMS voltages to 0.1% accuracy. |
| Datasheet, Manual, Mechanical and Serial I/O info. | |
| Manufacturer site: | |
AC Power Factor Meter & AC Phase Angle Meter
- Brand: Laurel Electronics, Inc.
- Model: L
- Availability: In Stock
-
366.00€
Available Options
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Tags: Panel Meter, AC Power Factor Meter & AC Phase Angle Meter, Laureate, Laurel Electronics, high accuracy