Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific quantity comparison means
Patent
1976-08-13
1978-03-14
Miller, J D
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific quantity comparison means
361 68, H02H 328
Patent
active
040794350
ABSTRACT:
The method of protecting power transmission lines is, accpording to the invention, based on a comparison between the actual quantities of current and/or voltage at the beginning of the protected section of a power transmission line and the same quantities of current and/or voltage calculated by means of current and voltage parameters at the end of the protected section providing there are no faults in this section. In apparatuses for realization of this method the voltage and current at the end of the protected section are multiplied in symmetrical components multipliers by respective coefficients of an equivalent four-terminal network substituting for the protected section and summed up. If there are no faults in this section, this calculated sum is equal to the respective electrical quantity at the beginning of the protected section. The electrical quantity measured at the beginning of the section is transmitted along a communications channel to the end of the section, where it is compared in a special unit with the respective calculated quantity. When a fault appears in the protected section, the equation of the compared quantities is upset and the effector of the apparatus operates. The proposed apparatus permits protection of conventional, long-range and adjusted power transmission lines of high and superhigh voltage.
REFERENCES:
patent: 2296784 (1942-09-01), Harder
patent: 2641634 (1953-06-01), Marihart
patent: 3225256 (1965-12-01), Carter et al.
patent: 3405320 (1968-10-01), Schwanenflugel
patent: 3590368 (1971-06-01), Esclangon
Chuvychin Vladimir Nikolaevich
Fabrikant Veniamin Lvovich
Pushkareva Ljudmila Ivanovna
Zaslavskaya Tamara Borisovna
Miller J D
Salce Patrick R.
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