Uf guard voltage and frequency protection - HDO
Three-stage mains protection for 3-phase and 1-phase systems with monitoring of frequency, phase or combined voltages. It 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:
- input for a wire with a mass remote control signal for immediate disconnection of the relay as a superior command to all other functions of the device
- allows the connection of a wide range of sources or appliances of electricity
- this series complies with the ČSN EN 50438 standard for parallel connection of microgenerators to the public distribution network, in accordance with PPDS No. 4 connection conditions valid from 1 January 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 an 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, 40 - 300 Vac / 80 .. 485 Vac optionally per vol.
- Supply voltage, input power: 150 - 300 Vac, 50 Hz ± 10%, <3W, undervoltage extension from 40 Vac 0.5 s selectable. Vol.
- Protection setting stages: single-phase 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) ± 0.5% S tr. , Alt. 100 Vac - 288 Vac optional on order, 280 Vac - 485 Vac (L vs. L measurement) ± 0.5% S tr.
- Frequency protection setting 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 for 276 or 287 V selection
- Voltage asymmetry measurement: 1 - 20%, in 1% increments, mag. Step 1% of Un = 230 V
- Output contacts- electromechanical relay:
- Latch. 6 A / 250 VAC
- Response speed: <10 ms
- Max. 105 at lower values
- Adjustable dwell time of relay contacts from the moment of network fault response adjustable from: 5 s to 30 min, 1 s step
- 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 per terminal max.: 2.5 mm2
- Instrument housing: ABS material, self-extinguishing according to UL94-V1
- Mounting: symmetrical rail 35 mm, width 70 mm (4 modules)
- Display: LCD display, backlight, two-colour LED for relay status indication
- Electrical lifetime of relay, instruments: 105 switching 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