4–90
M‑3311A Instruction Book
Through Fault
The Through Fault Monitor feature of the relay
provides the user with the means to capture time-
stamped Through Fault current information. A
“through fault” is defined as an overcurrent event
where the overcurrent passes through a transformer
and supplies a connected circuit that is faulted. Pow
-
er transformers may be subjected to Through Fault
currents, which can cause mechanical stresses and
thermal stress to winding insulation.
The Through Fault monitor data can be used to
NOTE:
Winding Four is not available in Two or Three Winding applications.
Figure 4-60 IPScom
®
Through Fault Function Setpoint Ranges
Path
:
Path
: Relay/Setup/Relay Setpoints/Through Fault
THFLT CURRENT THRESHOLD
10 Amps
THFLT CUM. I^2T LIMIT
100 kA^2-cycles
THFLT PU OPERATIONS LIM.
5 Records
THFLT CURRENT SELECT
sum1 sum2 w1 W2 w3 w4
THFLT DELAY
30 Cycles
predict transformer failures facilitating corrective
action. Recording the number and severity of
Through Faults experienced by a transformer can
aid in determining predictive maintenance practices.
The Through Fault monitor is triggered when current
in any one of the phases exceeds the set value of
the Through Fault Current Threshold for greater than
the Time Delay setting.
NOTE:
Winding Four is not available in Two or
Three Winding applications.
The Through Fault Threshold value is chosen to be above
the maximum expected load current and below the minimum
expected Through Fault current.
The Through Fault Current Limit and
I
^2t Threshold Limits are
set based on the capability of the transformer. The transformer
manufacturer may be consulted for guidance.
The Through Fault Time Delay is typically set at one Cycle
Содержание M?3311A
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Страница 67: ...M 3311A Instruction Book 2 12 Path Monitor Metering ll Figure 2 9 Metering II Screen 4 Winding ...
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Страница 89: ...M 3311A Instruction Book 3 2 Figure 3 2 IPScom Main Screen ...
Страница 93: ...M 3311A Instruction Book 3 6 Figure 3 8 Terminal Window Figure 3 7 IPScom Modem Communication Dialog Screen ...
Страница 99: ...M 3311A Instruction Book 3 12 Path Monitor Metering ll Figure 3 14 Metering II Screen 4 Winding ...
Страница 103: ...M 3311A Instruction Book 3 16 Path Monitor Phasor Diagram F87T Figure 3 18 Phasor Diagram F87T 4 Winding ...
Страница 107: ...M 3311A Instruction Book 3 20 Figure 3 22 Setup System Dialog Screen 2 3 Winding ...
Страница 108: ...IPScom 3 3 21 Figure 3 23 Setup System Dialog Screen 4 Winding ...
Страница 112: ...IPScom 3 3 25 Figure 3 29 I O Map Screen 4 Winding ...
Страница 114: ...IPScom 3 3 27 Figure 3 31 Display All Setpoints Screen 4 Winding ...
Страница 119: ...M 3311A Instruction Book 3 32 Figure 3 38 View Sequence of Events Recorder Screen ...
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Страница 150: ...4 23 System Setup and Setpoints 4 Figure 4 14 Setup Sequence of Events Recorder Dialog Screen ...
Страница 163: ...4 36 M 3311A Instruction Book Figure 4 15 IPScom Relay Setup System Dialog Screen 2 3 Winding ...
Страница 164: ...4 37 System Setup and Setpoints 4 Figure 4 16 IPScom Relay Setup System Dialog Screen 4 Winding ...
Страница 166: ...4 39 System Setup and Setpoints 4 Figure 4 18 IPScom Selection Screen for Input Settings ...
Страница 179: ...4 52 M 3311A Instruction Book Figure 4 28 Example of V Hz Capability and Protection Curves ...
Страница 187: ...4 60 M 3311A Instruction Book Figure 4 33 49 Function Overload Curves ...
Страница 229: ...4 102 M 3311A Instruction Book Table 4 5 Transformer Connections ...
Страница 231: ...4 104 M 3311A Instruction Book Table 4 7 Custom Transformer and CT Configuration ...
Страница 233: ...4 106 M 3311A Instruction Book CONNECTION EXAMPLES Figure 4 72 Typical Transformer Differential Application ...
Страница 234: ...4 107 System Setup and Setpoints 4 AUXILIARY TRANSFORMER EXAMPLE Figure 4 73 Delta ac Wye Wye CT Connection Diagram ...
Страница 236: ...4 109 System Setup and Setpoints 4 GSU TRANSFORMER EXAMPLE Figure 4 75 Wye Delta ac Delta ac CT Connection Diagram ...
Страница 243: ...M 3311A Instruction Book 5 6 Figure 5 5 Mounting Dimensions for GE L 2 Cabinet H3 and H4 ...
Страница 275: ...M 3311A Instruction Book 5 38 Dip Switch J46 J60 J61 J5 J20 J21 J22 J18 Figure 5 34 M 3311A Circuit Board Standard I O ...
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Страница 393: ...D 2 M 3311A Instruction Book Figure D 1 Volts Hz 24IT Inverse Curve Family 1 Inverse Square ...
Страница 394: ...Inverse Time Curves Appendix D D 3 Figure D 2 Volts Hz 24IT Inverse Family Curve 2 ...
Страница 395: ...D 4 M 3311A Instruction Book Figure D 3 Volts Hz 24IT Inverse Time Curve Family 3 ...
Страница 396: ...Inverse Time Curves Appendix D D 5 Figure D 4 Volts Hz 24IT Inverse Curve Family 4 ...
Страница 399: ...D 8 M 3311A Instruction Book Figure D 5 Definite Time Overcurrent Curve ...
Страница 400: ...Inverse Time Curves Appendix D D 9 Figure D 6 Inverse Time Overcurrent Curve ...
Страница 401: ...D 10 M 3311A Instruction Book Figure D 7 Very Inverse Time Overcurrent Curve ...
Страница 402: ...Inverse Time Curves Appendix D D 11 Figure D 8 Extremely Inverse Time Overcurrent Curve ...
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