U-f guard S voltage and frequency protection 3x16A
Three-stage mains protection for 3-phase and 1-phase systems with monitoring of frequency, phase or combined voltages. In addition, devices on sale from 1 February 2020 can also be used as a replacement for single-stage or two-stage protections if they are set in the measurement menu in one or two measurement stages so that the devices do not measure aggregated values of 10 minute intervals in the first overvoltage stage.
Main features:
- with built - in switch - disconnector for switched currents up to 3x16 A, no additional power disconnecting element is needed
- this series complies with standard ČSN EN 50438 for parallel connection of microgenerators to public distribution network, in accordance with PPDS no. 1. 2018
- clear display immediately shows network parameters without the need to connect another reader such as a computer
- with simple menu control it is possible to display recorded faults in the history, including the actual date and time
- high quality of measured voltages TRUE RMS with accuracy better than ± 0.5 %
- top accuracy of mains frequency measurement with a deviation of up to ± 0.005 Hz!
Technical parameters
- Measuring voltage range: 160 - 300 Vac / 150 - 485 Vac
- Supply Voltage, Power: 150 - 300 Vac, 50 Hz ± 10%, <3W
- Protection setting stages: single or three-phase, choice of measurement in 1, 2 or 3 stages
- Voltage protection setting range, measurement accuracy: 160 Vac - 276 Vac (L vs. N measurement) ± 1% S tr. , 280 Vac - 485 Vac (L vs. L measurement) ± 1% S tr.
- Frequency protection adjustment range, display range, measurement accuracy: 46.00 - 54.50 Hz, 46.000 - 54.500 Hz, ±0.005 Hz
- Tracking time - time measurement window, setting step:
- 1st stage: undervoltage 0.040 - 2 s, step 20 ms, overvoltage 0.040 - 3.2 s, step 20 ms, under/overfrequency: 0.040 - 0.6 s, step 20 ms
- Stage 2: undervoltage 0.040 - 2 s, step 20 ms, overvoltage 0.040 - 1 s, step 20 ms, under/overfrequency: 0.040 - 0.6 s, step 20 ms
- 3rd stage: overvoltage 0.100 s at 276 V
- Voltage asymmetry measurement: 1 - 20%, in 1% increments, mag. Step 1% of Un = 230 V
- Output contacts- electromechanical relay:
- Three-pole disconnector: 3x16 A / 250 Vac, max.3x 30 A
- Adjustable dwell time of relay contacts from the moment of mains fault response adjustable from: 5 s to 30 min, step 1 s
- Recording of date and time of switching of electromechanical contacts. relay: details of the last 14 detected disconnections
- Clock: adjustable calendar with clock accuracy ± 1 min/mo, after power disconnection the device keeps time thanks to internal battery (> 5 years)
- Working temperature, humidity: -20°C .. + 60°C, 95% <0.02%/°C
- Storage temperature, humidity: -30°C .. + 70°C, 95% (non-condensing)
- Conductor cross-section for terminals max.: 2.5 mm2, power contacts max.16 mm2
- Instrument housing: ABS material, self-extinguishing according to UL94-V1
- Mounting: symmetrical rail 35 mm, width 150 mm (9 modules)
- Display: LCD display, backlight, two-colour LED for relay status indication
- Electrical lifetime of relay, instrumentation: 105 openings at rated power, total lifetime > 40000 hours
- Control method, settings, standards: 3 buttons, access via 4-digit password, unique password can be assigned on special order, EN 60255-1; 60255-127; 61010-1, 2-201; 61000-4-30 in class S; 50438; 50160 class 2