# US 5,706,158 A · Method for short-circuit current limiting on an electrical power transmission line and configuration for short-circuit limiting > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,706,158 A - Document ID: US5706158A - Status: Granted - Kind: A - Application number: 08/592,026 - Filed: 1996-01-26 - Granted: 1998-01-06 - Earliest claimed: 1993-07-26 - Assignees: Siemens Aktiengesellschaft - Inventors: Walter Muller - Web page: https://patentgrep.com/patent/US5706158A ## CPC - H02J 3/04: Arrangements for connecting networks of the same frequency but supplied from different sources - H02H 9/02: responsive to excess current {(current limitation for voltage regulators G05F1/573; disconnection after limiting H02H3/025)} - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY - H02H: EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS (indicating or signalling undesired working conditions G01R, e.g. G01R31/00, G08B; locating faults along lines G01R31/08; emergency protective devices H01H) ## Abstract In order to obtain an improved operating behavior in the event of short circuits on a high-voltage line having a phase shifter, the phase shifter is used as a current limiter in the event of a fault. A fault signal, which results in an increase in an opposing voltage at an additional transformer of the phase shifter, is produced for this purpose, as a function of a fault current. ## Claims ### Claim 1 A method for short-circuit current limiting on an electrical transmission line, which comprises: connecting one winding of an additional transformer of a phase shifter to an electrical high-voltage transmission line for limiting a current on the high-voltage transmission line; activating short-circuit current limiting at the additional transformer with a control device by passing a fault signal from a grid protective device to the control device for activation of the short-circuit current limiting upon the occurrence of a short circuit on the high-voltage transmission line; and supplying power provided by an energizer transformer from the control device to the additional transformer, and producing an opposing voltage at the additional transformer on the high-voltage line in the sense of short-circuit current limiting with an in-phase, quadrature-phase or phase-shifted voltage. ### Claim 2 A method for short-circuit current limiting on an electrical transmission line, which comprises: connecting one winding of an additional transformer of a phase shifter to an electrical high-voltage transmission line for limiting a current on the high-voltage transmission line; detecting at least one of a fault direction and a fault location of a short circuit with a protective device, encrypting at least one of the fault direction and the fault location of the short circuit in a fault signal; activating short-circuit current limiting at the additional transformer with a control device by passing the fault signal from the protective device to the control device for activation of the short-circuit current limiting upon the occurrence of the short circuit on the high-voltage transmission line; and supplying power provided by an energizer transformer from the control device to the additional transformer, and producing an opposing voltage at the additional transformer on the high-voltage line in the sense of short-circuit current limiting with an in-phase, quadrature-phase or phase-shifted voltage as a function of the fault direction. ### Claim 3 A method for phase-shifted, in-phase or quadrature-phase regulation for current limiting, which comprises: connecting an additional transformer of a phase shifter to a high-voltage line; monitoring the high-voltage line for a short circuit with a grid protective device; producing a fault signal upon identification of a short-circuit current; and supplying the fault signal to a control device of the additional transformer for producing an opposing voltage at the additional transformer in the sense of current limiting. ### Claim 4 A configuration for short-circuit current limiting on an electrical transmission line, comprising: a protective device for detection of a short circuit on a high-voltage transmission line; and a phase shifter having: a converter-controlled additional transformer with one winding being connected to the high-voltage transmission line for limiting a current on the high-voltage transmission line; an energizer transformer for phase-shifted, quadrature-phase or in-phase regulation of power on the high-voltage transmission line; and a control device connected between said energizer transformer and said additional transformer for activation of short-circuit current limiting; said control device receiving a fault signal upon detection of a short circuit by said protective device, and an opposing voltage being produced at said additional transformer in the sense of short-circuit current limiting with an in-phase, quadrature-phase and phase-shifted voltage. ### Claim 5 (depends on 4) The configuration according to claim 4, wherein said protective device is a distance protective device. ### Claim 6 (depends on 4) The configuration according to claim 4, wherein said protective device is an overcurrent protective device. ### Claim 7 (depends on 4) The configuration according to claim 4, wherein said phase shifter has a converter including said control device, for supplying said additional transformer. ### Claim 8 (depends on 7) The configuration according to claim 7, wherein said converter is a semiconductor converter having an intermediate circuit.