Micom P634 - Completing Commissioning

This is not influenced by the set value of the function parameter for the phase
sequence. Changing the setting for the connection scheme of an involved series
transformer, on the other hand, will change the measured operating data value
by ±180°.
10.2.5.2 Checking Ground Differential Protection
The current I to which the P634 responds for single-side feed, neutral-point side,
is calculated as follows:
I ≥
I
diff >
⋅ I
nom
k
am,z
●
z: transformer end (a, b, c, d)
●
I
diff>
: set operate value
●
I
nom
: nominal current of the P634
●
k
am,z
: amplitude-matching factor of transformer end a, b, c, d
There will be no trip for single-side, single-pole, phase-side feed.
The differential and restraining currents formed by the P634 are displayed. The
display of differential and restraining currents is prevented, however, if they fall
below minimum thresholds that can be set by the user.
10.2.6 Completing Commissioning
Before the P634 is released for operation, the user should make sure that the
following steps have been taken:
●
(Reset at MAIN: General reset USER (password-protected) and
MT_RC: Reset record. USER, both in Oper/CtrlTest menu branch.)
●
Blocking of output relays has been cancelled.
(OUTP: Outp.rel.block USER, Par/Func/Glob menu branch, setting No.)
●
Blocking of the trip command has been cancelled.
(MAIN: Trip cmd.block. USER, Par/Func/Glob menu branch, setting No.)
●
The device is on-line.
(MAIN: Device on-line, Par/Func/Glob menu branch, setting Yes (= on).)
After completion of commissioning, only the green LED indicator signaling
“HEALTHY” (H1) should be on.
P634 10 Commissioning
10-10 P634/EN M/R-42-A // P634‑311‑653