Ratings And Specifications - Mitsubishi Electric MELPRO-A Series Instruction Manual

MDG-A3 Series Directional Earth Fault Relay [Standard: JIS C 4609 (1990)]
Features
1. Directional earth fault relay for MPD-3 type ZVT
correspondence.
2. Wide setting range and fine setting steps enable
flexible protection coordination.
3. The number of connectable relay units to MPD-3 type
ZVT is increased to 20.
Caution
However, this increase is limited only when all
of the relays are composed of New MELPRO-A series. If
another series are combined, the number of connectable
units is limited to 5.

Ratings and Specifications

Type name
Style No.
Zero-sequence current
Zero-sequence voltage
Ratings
Frequency
Auxiliary power supply
I Operation value
0
V Operation value
0
Operating time
Settings
Using
Output contact
condi
Max. sensitivity
tion
Self-monitoring
Operation indicator
Display
Numerical display
Frequency
angle
The "RUN" indicator (green-color) is lighted in normal condition.
The indicator turns from black into orange color when the protection element
is put into operation. (Manual resetting type)
Operating time setting
Fault record of phase
TEST (Forced operation)
※1 "Lo." means LOCK setting (the protection element is locked).
※2 "In." is the display for instantaneous setting.
4. Max. 20 relays can be connected through V0 extension
terminal.
5. Reset method of output contacts can be switchable
between auto-reset and self-hold.
6. The fault value record function is installed.
7. Good operability and visibility design is adopted.
The numerical display turns on for 3 seconds when the
setting value is changed, which enables to check
setting values easily.
8. Panel cutout is the same as previous MELPRO-A series
and E series.
MDG-A3V-R
104PGA
0.2A (MZT type ZCT primary)
7V (MPD-3 type ZVT secondary)
50/60Hz (switchable)
AC110V (Range: 90～120V)
0.1 -0.2-0.4-0.6-0.8-1.0A (ZCT primary value)
(*)
LOCK -2-2.5-3-4-5-6-7-7.5-8-9–10%
(*)
(Single-phase fault in 6.6kV power systems:
V primary = 3810V, ZVT secondary = 7V)
0
Instantaneous -0.2-0.3-0.4-0.5-0.6-0.7-0.8-0.9-1.0s
(*)
50Hz(SW1-ON) - 60Hz
Self-hold(SW2-ON) – Auto-reset
Lead 10°(SW3-ON) – Lead 45°
Indication item
V measurement
0
I measurement
0
Phase measurement
V , I Pickup
0 0
V setting
0
I setting
0
Condition setting
Fault record of V
0
Fault record of I
0
Clear fault record
6
MDG-A3V-RD
519PGA
(SW1-OFF)
(*)
(SW2-OFF)
(*)
(SW3-OFF)
(*)
Range
1.0～12.0%
0.05～0.09A, 0.1～1.5A
0～359°(V standard, I
0 0
U.-I.
Lo. ,2.0～10%
(※1)
0.1～1.0A
In. ,0.2～1.0s
(※2)
Frequency, output contact, and max.
sensitivity angle are shown at intervals
of 2 seconds.
2.0～40.0%
0.1～1.5A
0～359°(V standard, I
0 0
O.K.
F.O.
lag display)
lag display)
JEP0-IL9554