Function Range or value Accuracy
Connection type for each of the
windings
Y or D -
Phase displacement between high
voltage winding, W1 and each of the
windings, W2 and W3. Hour notation
0–11
-
*Operate time at 0 to 10 x IdMin,
restrained function
Min. = 25 ms
Max. = 35 ms
-
*Reset time at 10 to 0 x IdMin, restrained
function
Min. = 5 ms
Max. = 15 ms
-
*Operate time at 0 to 10 x Idunre,
unrestrained function
Min. = 5 ms
Max. = 15 ms
-
*Reset time at 10 to 0 x Idunre,
unrestrained function
Min. = 15 ms
Max. = 30 ms
-
**Operate time, unrestrained negative
sequence function
Min. = 10 ms
Max. = 20 ms
-
**Reset time, unrestrained negative
sequence function
Min. = 10 ms
Max. = 30 ms
-
Critical impulse time 2 ms typically at 0 to 5 x IdMin -
*Note: Data obtained with single input current group.
**Note: Data obtained with two input current groups. The rated symmetrical currents are applied on both
sides as pre- and after-fault currents. The fault is performed by increasing one phase current to double
on one side and decreasing same phase current to zero on the other side.
6.2 1Ph High impedance differential protection HZPDIF
6.2.1 Identification
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
1Ph High impedance differential
protection
HZPDIF
SYMBOL-CC V2 EN
87
6.2.2 Functionality
The 1Ph High impedance differential protection HZPDIF functions can be used when
the involved CT cores have the same turns ratio and similar magnetizing
characteristics. It utilizes an external CT secondary current summation by wiring.
Actually all CT secondary circuits which are involved in the differential scheme are
connected in parallel. External series resistor, and a voltage dependent resistor which
are both mounted externally to the IED, are also required.
The external resistor unit shall be ordered under IED accessories in the Product Guide.
1MRK502052-UEN B Section 6
Differential protection
141
Technical manual
To Next Page
Loading...
