Manual 37137B
ESDR 4 - Current Differential Protection Relay
Page 22/35
© Woodward
Basic Data
≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡
adjust settings
[press "SELECT"]
Configuration mode
"Select" button
Pressing the "Select" key activates the configuration mode, and the following pa-
rameters can be enabled or changed within the given limits. Please you note that as
you advance through the configuration screens, by configuring some parameters as
"ON", additional screens must be configured relating to that parameter. If the pa-
rameter is configured as "OFF", the additional screens will be disabled and not dis-
played.
Software version
Software version
Displays the software version.
SPRACHE/LANGUAGE
----------------
Language selection
english/german
The screens can be displayed in German or English.
curr. transform.
ratio 0000/x
CT-Ratio Selection
10 to 6,000/{x} A
The Ratio of the CTs being used is entered here. The CTs should be selected so that
in fault-free operation at generator rated current, at least 60 % of nominal current
flows in the CT-secondary. Failure to use properly a sized CT-Ratio leads to loss of
resolution and inaccuracies in the monitoring functions.
generator nomin.
current 0000A
Generator rated current
5 to 6,000 A
This value is used as reference value for the calculation and display of restraint cur-
rent and differential current. The entered value of generator current must be at least
60% of the nominal current of the CT and must not exceed the entered value of CT
nominal current.
Example
CT-Ratio
500/5 A
Range of Generator rated current
300 A to 500 A.
If the nominal value is less than 50% of the transformer ratio, the message "Wrong
Entry" will be displayed on the screen in Automatic mode and the unit will de-
activate monitoring functions (the Monitoring LED goes out).
automatic reset
relay ON
Automatic reset of the relay
ON/OFF
Applies only to monitoring level 2 (tripping).
Monitoring level 1 (warning) always Auto-resets.
ON
................The relays de-energize automatically when the fault is no longer pre-
sent. The screen input "Automatic reset of error text" determines
what happens to the Alarm-text in the display.
OFF
..............The relays remain energized until they are reset.
