Bender VMD420 line feeder protection relay

Bender VMD420 Feeder Potection Relay

The Bender VMD420 line protection relay monitors AC currents using three measuring inputs for overcurrent, undercurrent or undercurrent and overcurrent (window discriminator function). The currents are measured as r.m.s. values (AC). The currently measured values are continuously shown on the LC display.

The respective measuring channel can be selected using the Arrow up or Arrow down button. The measured values causing the alarm relay to switch are stored. Due to adjustable delay times, installation-specific characteristics, such as device specific making currents, short-time current changes etc. can be considered.

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Feature

  • Monitoring AC/DC systems for under voltage, overvoltage and frequency in the voltage range of 0…300 V
  • Various monitoring functions selectable < U, > U, < f, > f
  • Start-up delay, response delay and delay on release
  • Adjustable switching hysteresis
  • m.s. value measurement (AC+DC)
  • Digital measured value display via multi-functional LC display
  • Preset function (automatic setting of basic parameters)
  • LEDs: Power On, Alarm 1, Alarm 2
  • Measured value memory for operating value
  • Continuous self-monitoring
  • Internal test/reset button
  • Two separate alarm relays (one changeover contact each)
  • N/C or N/O operation and fault memory behavior selectable
  • Password protection for device setting
  • Sealable transparent cover
  • Two-module enclosure (36 mm)
  • Push-wire terminal (two terminals per connection)
  • RoHS compliant

Specification

CMD420…
Rated insulation voltage AC 250 V
Rated impulse voltage/pollution degree 6 kV/3
Protective separation (reinforced insulation) between (A1, A2) -(k, l) -(11, 12, 14) -(21,22, 24)
Protective separation (reinforced insulation) between (k1, l1, k2, l2, k3, l3) -(11,12,14)
Voltage test acc. to IEC 61010-1 3.536 kV
CMD421…
Rated insulation voltage AC 250 V
Rated impulse voltage/pollution degree 4 kV/3
Basic insulation between: (k1, l1, k2, l2, k3, l3)-(A1, A2), (21,22, 24)
Basic insulation between: (11, 12, 14) -(21, 22, 24)
Voltage test acc. to IEC 61010-1 2.21 kV
Supply voltage
CMD420-D-1, CMD421-D-1:
Supply voltage Us AC 16-72 V/DC 9.6^94 V
Frequency range Us 15-460 Hz
CMD420-D-2, CMD421-D-2:
Supply voltage Us AC/DC 70^300 V
Frequency range Us 15-460 Hz
Power consumption < 4VA
Measuring circuit CMD420
Nominal measuring range (r.m.s. value) n = 1 Ac 0-1A
Overload capability, continuous 2 A AC
Overload capability < 5 s 5 A
Load per measuring input 50M ohm
Rated frequency fn 42.2000 Hz
Response values CMD420
Undercurrent Lo I< (Alarm 2) n=1 AC 0.1.1 A (0.3 A)*
Undercurrent Lo I< (Alarm 1) n=1 100.200 % (150 %)*
Overcurrent Hi I> (Alarm 2) n = 1 AC 0.1.1 A (0.3 A)* (Hi)*
Overcurrent Hi I> (Alarm 1) n = 1 50.100 % (50 %)* (Hi)*
Window In I> (Alarm 2) n = 1 AC 0.1.1 A (0.3 A)*
Window In I< (Alarm 1) n = 1 50.100 % (50 %)*
External current transformer x/1 A
Transformation ratio n 1.2000 (1)*
Relative uncertainty in the range of 42^460 Hz ±5 %, ±2 digits
Hysteresis 3.40% (15 %)*
Measuring circuit CMD421
Nominal measuring range (r.m.s. value) AC 0.5 A
Overload capability, continuous 7.5 A
Load per measuring input 3 M ohm
Rated frequency fn 42.460 Hz
Response values CMD421
Undercurrent Lo I < (Alarm 2) n = 1 AC 0.5.5 A (1.5 A)*
Undercurrent Lo I < (Alarm 1) n = 1 100.200 % (150 %)*
Take a maximumnominalcurrentof5 A into consideration!
Overcurrent Hi I > (Alarm 2) n = 1 AC 0.5.5 A (1.5 A)* (Hi)*
Overcurrent Hi I > (Alarm 1) n = 1 50.100 % (50 %)* (Hi)*
Window In I> (Alarm 2) n = 1 AC 0.5.5 A (1.5 A)*
Window In I< (Alarm 1) n = 1 50.100 % (50 %)*
External current transformer x/5 A
Transformation ratio n 1.2000 (1)*
Relative uncertainty in the range of 42^460 Hz ±5 %, ±2 digits
Hysteresis 3.40% (15 %)*
Time response
Start-up delay t 0.300 s (0.5 s)*
Response delay ton1 0.300 s (1s)*
Response delay ton2 0.300 s (0 s)*
Delay on release toff 0.300 s (1s)*
Resolution of setting t, ton1/2, toff (0.. .10 s) 0.1 s
Resolution of setting t, ton1/2, toff (10.. .99 s) 1 s
Resolution of setting t, ton1/2, toff (100.300s) 10 s
Operating time tae < 130 ms
Response time tan tan = tae +ton1/2
Device release time tre < 135 ms
Release time toff toff = tre +tf
Recovery time tb < 300 ms

 

Applications

  • Single-phase voltage and frequency monitoring of machines and electrical installations
  • Earth fault monitoring in medium-voltage systems via voltage transformers
  • Monitoring of battery systems
  • Switching on and switching off at a certain voltage level

 

Dimension

Bender VMD420

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