Manual 37137B
ESDR 4 - Current Differential Protection Relay
Page 20/35
© Woodward
13
Display V
↓
/ Digit
↑
Display V
↓
/ Digit
↑
Automatic mode:
Display V
↓
-By pressing this button, the actual values of
the restraint current I
s
and the differential current I
d
are shown
alternately in the top line of the display (the LEDs indicate
which is being currently displayed).
Configuration mode:
Digit
↑
- By pressing this button, number at the above
the cursor is increased by one digit. The value cannot be con-
figured outside the permissible adjustment limits defined in
Appendix B: List of Parameters If the highest permissible
value is reached, the value will automatically revert to the
lowest permissible number.
14
Clear / Cursor
→
Clear / Cursor
→
Automatic mode:
Clear - The alarm text in the LC-display is deleted if this
button is pressed and held for 3 seconds and no alarm condi-
tion is present.
Configuration mode:
Cursor
→
- The cursor is moved one position to the
right by pressing this button. The cursor will automatically
move to the extreme left position of the value to be changed
when the cursor reaches the extreme right and the button is
pressed again.
LC Display
≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡
5
LC-Display LC-Display
Messages and values are displayed depending on the selected mode.
In the configuration mode, the unit’s parameter values can be viewed and edited (see Chapter "Parameter"). In
Automatic mode, the measured values and alarms are displayed.
Top Line
displays I
s
and I
d
.
Bottom Line
Normal condition: blank
Otherwise: Alarm text.
Source
Alarm text
Differential current in Phase L1 exceeds the warning threshold (monitoring level 1)
Warning Id L1
Differential current in Phase L2 exceeds the warning threshold (monitoring level 1)
Warning Id L2
Differential current in Phase L3 exceeds the warning threshold (monitoring level 1)
Warning Id L3
Differential current in Phase L1 exceeds the tripping threshold (monitoring level2)
Fault Id L1
Differential current in Phase L2 exceeds the tripping threshold (monitoring level2)
Fault Id L2
Differential current in phase L3 exceeds the tripping threshold (monitoring level 2)
Fault Id L3
Non-permissible value of Parameter "CT-ratio" or "Generator Current"
Wrong Entry
These alarm texts are displayed sequentially by pressing the Message
↓
button repeatedly. After the last alarm
text has been displayed, the controller returns to the start screen.
