Bender VME421 Feeder Protection Relay

Bender VME421 Feeder Protection Relay

The voltage relays of the VME421H series are designed to monitor the frequency, under voltage, overvoltage and the voltage between two threshold values (window discriminator function) in AC and DC systems. The voltages are measured as r.m.s. values. The currently measured value is continuously shown on the LC display.

The measured value leading to the activation of the alarm relays will be stored. Due to adjustable response times, installation-specific characteristics, such as device-specific start-up procedures, short-time voltage fluctuations, etc. can be considered. Device version VME421H takes the supply voltage from the system being monitored and utilizes an internal energy backup.

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Feature

  • Under voltage, overvoltage and frequency monitoring of AC/DC systems, 9.6…150 V (VME421H-D-1), 70…300 V (VME421H-D-2)
  • Without external supply voltage
  • Integrated energy backup
  • Different monitoring functions selectable < U, > U, < f, > f
  • Start-up delay, response delay, delay on release
  • Adjustable switching hysteresis
  • m.s. value measurement (AC + DC)
  • Digital measured value display via multi-functional LC display
  • Preset function (automatic assignment of basic parameters)
  • LEDs: Power On, Alarm 1, Alarm 2
  • Measured value memory for operating value
  • Continuous self-monitoring
  • Internal test/rest 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

Applications

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

 

Dimension

 

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

 

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