Siemens SIPROTEC 7SJ62 Instruction Manual

Functions
6-317SJ62 Manual
C53000-G1140-C121-1
Figure 6-17 Visualization of a User Specified Characteristic Curve in DIGSI
®
4
If address  was set to 8VHU' HILQHG3LFNXS&XUYH or 8VHU'HILQHG
3LFNXSDQG5HVHW&XUYH during configuration of the user-specified curve option,
a maximum of 20 value pairs (current and time) may be entered at address 
1 to represent the time-current characteristic curve associated with the 51 element.
This option allows point-by-point entry of any desired curve.
If address  was set to 8VHU' HILQHG3LFNXSDQG5HV HW&XUYH during
configuration of the user-specified curve option, additional value pairs (current and re-
set time) may be entered at address  0RI385HV77S to represent the reset
curve associated with the 51 element.
Current and time values are entered as multiples of the address  and  set-
tings. Therefore, it is recommended that addresses  and  be initially set to
 to simplify the calculation of these ratios. Once the curve is entered, the settings
at addresses  and  may be modified if necessary.
Upon delivery of the device, all time values are set at ∞, preventing pickup of the de-
vice from initiating a trip signal.
When entering a user-specified curve, the following must be observed:
− Enter the data points in ascending order. The time overcurrent functions will sort the
data points by current values in ascending order. The graphical representation dis-
plays the data points in the order they are entered.
− As few as 10 pairs of numbers may be entered at the user’s option. Each unused
pair must then be marked as unused by entering “∞” as for the time and current val-
ues. It is important to view the curve to ensure that it is clear and constant.
− Current flows which are less than the
smallest current value entered will not lead to
an extension of the tripping time beyond the time associated with the smallest cur-
rent value entered. The characteristic curve (see Figure 6-18) represents constant
tripping time for currents less than the
smallest current value entered.
− Current flows which are greater than the
largest current value entered will not lead
to a reduction of the tripping time below the time associated with the largest current
value entered. The characteristic curve (see Figure 6-18) represents constant trip-
ping time for currents greater than the
largest current value entered.
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Siemens SIPROTEC 7SJ62 Specifications

General

Brand	Siemens
Model	SIPROTEC 7SJ62
Category	Relays
Language	English