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US 11,411,389 B1Granted
Systems and methods for a controlled dynamic MHO distance characteristic
AssigneeGeneral Electric Technology GmbH
InventorsVenkatesh Chakrapani, Ilia Voloh
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Abstract
Systems, methods, and computer-readable media are disclosed for identifying a fault using systems and methods for a controlled dynamic MHO characteristic. Particularly, the systems and methods described herein may automatically control the dynamic expansion of the MHO characteristic based on the estimation of uncontrolled dynamic MHO expansion estimation and maximum allowable expansion set by a user. This may provide flexibility in that, the MHO can be allowed to expand to a maximum level, when the estimated MHO expansion value is below the user defined maximum allowable expansion level, but also provides a controlled dynamic MHO when the estimated values are above the maximum allowable level.
Claims20
A system comprising:
- a computer processor operable to execute a set of computer-readable instructions;
- and
- a memory operable to store the set of computer-readable instructions operable to:
- receive, by a relay, one or more analog signals from a voltage transformer and a current transformer of a protected line;
- calculate, by the relay, one or more phase quantities, one or more sequence quantities, a source impedance ratio (SIR) quantity, a residual compensation, loop currents, and loop voltages;
- determine, based on stored distance settings, one or more sequence quantities, one or more phase quantities, a residual compensation and source impedance ratio (SIR) quantity, and a circular MHO characteristic of the relay;
- compare an actual expansion of the circular MHO characteristic during a fault to a pre-set maximum expansion value;
- determine that the actual expansion is less than the pre-set maximum expansion value;
- set, based on the determination that the actual expansion is less than the pre-set maximum expansion value, a polarizing voltage using a voltage stored in memory;
- determine, that the actual expansion is greater than the pre-set maximum expansion value;
- set, based on the determination that the actual expansion is greater than the pre-set maximum expansion value, the polarizing voltage using weighed sum of the voltage stored in memory and actual loop voltage to prevent the MHO characteristic from expanding beyond the pre-set expansion value;
- determine, using the MHO characteristic, a fault condition on the protected line;
- and
- send an instruction to perform a protective control function based on the fault condition.
11 more elements
A method comprising:
- receiving, by a relay, one or more analog signals from a voltage transformer and a current transformer of a protected line;
- calculating, by the relay, one or more phase quantities, one or more sequence quantities, a source impedance ratio (SIR) quantity, a residual compensation, loop currents, and loop voltages;
- determining, based on stored distance settings, one or more sequence quantities, one or more phase quantities, a residual compensation and source impedance ratio (SIR) quantity, and a circular MHO characteristic of the relay;
- comparing an actual expansion of the circular MHO characteristic during a fault to a pre-set maximum expansion value;
- determining that the actual expansion is less than the pre-set maximum expansion value;
- setting, based on the determination that the actual expansion is less than the pre-set maximum expansion value, a polarizing voltage using a voltage stored in memory;
- determining, that the actual expansion is greater than the pre-set maximum expansion value;
- setting, based on the determination that the actual expansion is greater than the pre-set maximum expansion value, the polarizing voltage using weighed sum of the voltage stored in memory and actual loop voltage to prevent the MHO characteristic from expanding beyond the pre-set expansion value;
- determining, using the MHO characteristic, a fault condition on the protected line;
- and
- sending an instruction to perform a protective control function based on the fault condition.
8 more elements
A non-transitory computer-readable medium storing computer-executable instructions, that when executed by at least one processor, cause the at least one processor to perform operations of:
- receiving, by a relay, one or more analog signals from a voltage transformer and a current transformer of a protected line;
- calculating, by the relay, one or more phase quantities, one or more sequence quantities, a source impedance ratio (SIR) quantity, a residual compensation, loop currents, and loop voltages;
- determining, based on stored distance settings, one or more sequence quantities, one or more phase quantities, a residual compensation and source impedance ratio (SIR) quantity, and a circular MHO characteristic of the relay;
- comparing an actual expansion of the circular MHO characteristic during a fault to a pre-set maximum expansion value;
- determining that the actual expansion is less than the pre-set maximum expansion value;
- setting, based on the determination that the actual expansion is less than the pre-set maximum expansion value, a polarizing voltage using a voltage stored in memory;
- determining, that the actual expansion is greater than the pre-set maximum expansion value;
- setting, based on the determination that the actual expansion is greater than the pre-set maximum expansion value, the polarizing voltage using weighed sum of the voltage stored in memory and actual loop voltage to prevent the MHO characteristic from expanding beyond the pre-set expansion value;
- determining, using the MHO characteristic, a fault condition on the protected line;
- and
- sending an instruction to perform a protective control function based on the fault condition.
8 more elements
Dependencies are inferred from the claim text.