This component generates standardized Transient Recovery Voltage (TRV) curves and outputs violations when the input voltage exceeds the envelope. This is a simplified approach to determining whether a breaker will restrike after a current interruption.
There are several options available for standardized envelopes:
User Defined: The user can enter data points for up to four, two-parameter curves and four, four-parameter curves.
IEC: Using the standardized curve parameters from IEC 62271, the user can select the TRV breaker class and voltage level.
IEEE: Using the standardized curve parameters from IEEE C37.011-2019, the user can select the TRV breaker class and voltage level.
IEC + User Defined: Using the standardized curve parameters from IEC 62271, the user can select the TRV breaker class and voltage level. In addition the user can enter data points for up to four, two-parameter curves and four, four-parameter curves. This can be used to enter supplementary curves that are not included in the standard.
IEEE + User Defined: Using the standardized curve parameters from IEEE C37.011-2019 the user can select the TRV breaker class and voltage level. In addition the user can enter data points for up to four, two-parameter curves and four, four-parameter curves. This can be used to enter supplementary curves that are not included in the standard.
Source Fault: Special TRV curves used for breakers installed between a generator and a transformer. Two parameter curves found in IEEE C37.013.
Brk: This input accepts the breaker status signal output from a three phase breaker model.
TRV: This input accepts the measured voltage across the breaker.
Vio(A-B-C): One violation output for each phase. Blue pip indicates A phase. Violations order is 10%, 30%, 60%, 100%, User 2p Curve 1-4, User 4p Curve 1-4. A violation output occurs when the TRV exceeds the envelope.
Env(A-B-C): One envelope output for each phase. Blue pip indicates A phase. Envelopes order is 10%, 30%, 60%, 100%, User 2p Curve 1-4, User 4p Curve 1-4 then the negative envelopes in the same order.
More: |
Standard TRV PointsStandard TRV Points
TRV Standard |
Choice |
Select User Defined, IEC, IEEE, IEC + User Defined, IEEE + User Defined or Source Fault. |
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TRV Class |
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Choice |
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Select S1 (1 kV to 100 kV), S2 (15 kV to 100 kV), EENS (100 kV to 800 kV) or NENS (100 kV to 170 kV). |
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Tolerance for failure detection |
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REAL |
Constant |
Enter the minimum tolerance for failure detection. This will require the TRV to exceed the envelope by this amount before a violation occurs. Prevents violations during the first few time steps post breaker opening [kV]. |
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IEC S1 Rated Voltage |
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Choice |
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Select the rated voltage of the breaker when IEC S1 breaker class is selected. |
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IEC S2 Rated Voltage |
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Choice |
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Select the rated voltage of the breaker when IEC S2 breaker class is selected. |
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IEC EENS Rated Voltage |
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Choice |
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Select the rated voltage of the breaker when IEC EENS breaker class is selected. |
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IEC NENS Rated Voltage |
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Choice |
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Select the rated voltage of the breaker when IEC NENS breaker class is selected. |
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IEEE S1 Rated Voltage |
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Choice |
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Select the rated voltage of the breaker when IEEE S1 breaker class is selected. |
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IEEE S2 Rated Voltage |
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Choice |
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Select the rated voltage of the breaker when IEEE S2 breaker class is selected. |
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IEEE EENS Rated Voltage |
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Choice |
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Select the rated voltage of the breaker when IEEE EENS breaker class is selected. |
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IEEE NENS Rated Voltage |
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Choice |
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Select the rated voltage of the breaker when IEEE NENS breaker class is selected. |
User Defined TRV PointsUser Defined TRV Points
Number of 2 Parameter Curves |
Choice |
Number of two parameter user entered curves. Applicable when TRV Standard is User Defined, IEC + User Defined, or IEEE + User Defined. |
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Number of 4 Parameter Curves |
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Choice |
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Number of four parameter user entered curves. Applicable when TRV Standard is User Defined, IEC + User Defined, or IEEE + User Defined. |
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Curve # Name (2 Parameter) |
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Text |
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Optional name to help user identify the curve. |
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Curve # TRV Peak Time |
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REAL |
Constant |
Time to peak envelope voltage [ms]. |
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Curve # TRV Peak Value |
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REAL |
Constant |
Peak voltage of envelope [kV]. |
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Curve # Name (4 Parameter) |
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Text |
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Optional name to help user identify the curve. |
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Curve # First Time |
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REAL |
Constant |
Time to first bend in envelope [ms]. |
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Curve # First Reference Voltage |
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REAL |
Constant |
Voltage at first bend in envelope [kV]. |
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Curve # TRV Peak Time |
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REAL |
Constant |
Time to peak envelope voltage [ms]. |
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Curve # TRV Peak Value |
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REAL |
Constant |
Peak voltage of envelope [kV]. |
Fault Location |
Choice |
Select System-Source Fault or Generator-Source Fault.
Dependent on which source of current the breaker is attempting to break. If the fault is on the generator side of the breaker the fault location is a System-Source Fault otherwise it is a Generator-Source Fault. |
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Rated Maximum Voltage |
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REAL |
Constant |
Enter the rated maximum voltage of the breaker [kV]. |
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Transformer/Generator Three Phase MVA Rating |
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REAL |
Constant |
Enter the rated three phase MVA of the feeding transformer (System-Source Fault) or Generator (Generator-Source Fault) [MVA]. |