Bender VME421 Feeder Protection Relay

Feature of Bender VME421

• Under voltage, overvoltage, and frequency monitoring of AC/DC systems, 9.6…150 V (VME421H-D-1), 70…300 V (VME421H-D-2)
• Without an  external supply voltage
• Integrated energy backup
• Different monitoring functions selectable < U, > U, < f, > f
• Start-up delay, response delay, delay in 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

 

Specification of Bender VME421

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)*
The 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)*
The 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 of Bender VME421

• 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