Protection Settings; Disturbance Recorder Settings; Control And Support Settings; Password Protection - GE P741 Technical Manual

Getting Started
MiCOM P741, P742, P743
All of the settings in the menu fall into one of three categories; protection settings,
disturbance recorder settings, or control and support (C&S) settings. One of two different
methods is used to change a setting depending on which category the setting falls into.
Control and support settings are stored and used by the relay immediately after they are
entered. For either protection settings or disturbance recorder settings, the relay stores the
new setting values in a temporary 'scratchpad'. It activates all the new settings together, but
only after it has been confirmed that the new settings are to be adopted. This technique is
employed to provide extra security, and so that several setting changes that are made within
a group of protection settings will all take effect at the same time.
1.5.1

Protection settings

The protection settings include the following items:
−
Protection element settings
−
Scheme logic settings
There are four groups of protection settings, with each group containing the same setting
cells. One group of protection settings is selected as the active group, and is used by the
protection elements.
1.5.2

Disturbance recorder settings

The disturbance recorder settings include the record duration and trigger position, selection
of analogue and digital signals to record, and the signal sources that trigger the recording.
1.5.3

Control and support settings

The control and support settings include:
−
Relay configuration settings
−
Open/close circuit breaker
−
CT & VT ratio settings
−
Reset LEDs
−
Active protection setting group
−
Password & language settings
−
Communications settings
−
Measurement settings
−
Event & fault record settings
−
User interface settings
−
Commissioning settings
1.6

Password protection

The menu structure contains three levels of access. The level of access that is enabled
determines which of the relay's settings can be changed and is controlled by entry of two
different passwords. The levels of access are summarized in Table 2.
Access level
Level 0
No password required
Operations enabled
Read access to all settings, alarms, event
records and fault records
P74x/EN GS/Na7
(GS) 3-13
GS