Maintenance and Repair
288
7SS52 V4 Manual
C53000-G1176-C182-1
The following measures allow to locate the failure.
General
measures
If the substation is operating and the control voltage for the trip circuits of the circuit
breakers is on, the intact portion of the protection system can remain available until
the failure is eliminated.
For this purpose, set the parameter BLOCKING MODE (6305/CU) to zone/phase.
The protection processing remains active for all zones which are not affected by the
failure. Tripping is enabled by the check zone. As a result, the functioning of the
faulty bay is suspended (Chapter 5.5.1, page 139).
Set the parameter Bay status (XX12/CU) to out of service to take the faulty
bay out of service. The protection function is now active again for all zones. The
faulty bay unit no longer appears in the alarm list of the central unit.
Test mode of the
SK module
To further locate the failure, switch the ZPS-SK module to test mode. The protection
processing is the same as in normal mode, but more tolerant to errors.
In test mode, the LEDs on the ZPS-SK module have more options for indicating
information. The LEDs are visible after opening the front panel of the central unit. One
red flashing LED per ZPS-SK module indicates that the ZPS-SK module is in test
mode. One green and three yellow LED indicate the disturbed duplex channel with the
highest channel number according to Table 8-5, page 288. A flashing greed LED
indicated that at least one duplex channel on the ZPS-SK module is faulty.
There are two ways for activating the test mode on the ZPS-SK module. The first is to
activate the test mode with the DIGSI communication software:
Open the central unit in the DIGSI Manager.
Double-click in the navigation window of the DIGSI Device Configuration the folder
Online. This will open the directory containing the operating functions of the device
(see Figure 6-1, page 207).
Click Parameters. The function selection now shows the groups of parameters.
Double-click Parametergruppe. You will now see the “Parameter Group” window.
Double-click the function Schutz allgemein. You will now see the “Schutz
allgemein – Parametergruppe A” window.
Table 8-5 LEDs of the ZPS-SK module in SK test mode
LEDs Status
RED
H1
GREEN
H1
YELLOW1
H2
YELLOW2
H3
YELLOW3
H4
⊗
⊗
⊗
⊗
⊗
⊗
⊗
⊗
⊗
o
⊗
⊗
⊗
⊗
⊗
⊗
⊗
⊗
•
•
o
•
o
•
o
•
o
•
•
•
o
o
•
•
o
o
•
•
•
•
•
o
o
o
o
no failure
Failure in channel 0, bay 1
Failure in channel 1, bay 2
Failure in channel 2, bay 3
Failure in channel 3, bay 4
Failure in channel 4, bay 5
Failure in channel 5, bay 6
Failure in channel 6, bay 7
Failure in channel 7, bay 8
o
bright
• dark
∇ dim
⊗ flashing
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