Phase-sensitive ground fault protective systems专利检索-线路跳闸分销网络和设备专利检索查询-专利查询网

Phase-sensitive ground fault protective systems

阅读：654发布：2022-08-08

专利汇可以提供Phase-sensitive ground fault protective systems专利检索，专利查询，专利分析的服务。并且To prevent possible electrocutions and to minimize the risk of fires caused by insulation faults in alternating current power distribution systems, a protective system responsive to ground fault currents in phase with the line potentials interrupts the electrical power. Ground fault currents are detected by a sensor responsive to differential or unbalanced currents in the supply conductors of the distribution system. The unbalanced currents are compared with the phase of the line potentials by a demodulator to detect only in-phase components and produce an output signal representing a true fault, the magnitude of which depends on the degree of current imbalance. Output signals exceeding a threshold value trip a circuit breaker to remove power from the load conductors. The combination is sensitive to ground faults of either high or low resistances, and is substantially insensitive to spurious signals which do not represent true faults.，下面是Phase-sensitive ground fault protective systems专利的具体信息内容。

权利要求

1. A phase-sensitive ground fault protective system for use in a power distribution system for supplying a.c. power to load from at least two supply conductors, one of such conductors being grounded at the source, comprising: differential current sensing means responsive to currents in said supply conductors for generating signals representing a differential current carried by said supply conductors; and synchronous demodulator means responsive to said differential current signals and to the phase of potentials between said supply conductors for deriving a fault-characterizing signal representing the resistive components of said differential currents in phase with the potentials across such supply conductors.

2. A phase-sensitive ground fault protective system of claim 1 wherein said demodulator means comprises principally passive biased diodes to derive said fault-characterizing signals.

3. The phase-sensitive ground fault protective system of claim 1 wherein said demodulator means comprises principally active elements to realize a signal gain in deriving said fault-characterizing signals.

4. The phase-sensitive ground fault protective system of claim 1 further including means for integrating said fault-characterizing signal to derive an integrated fault-characterizing signal.

5. The phase-sensitive ground fault protective system of claim 4 further including circuit interrupting means for interruptiNg continuity through said supply conductors when said integrated fault-characterizing signal exceeds a predetermined threshold level.

6. A phase-sensitive ground fault protective system for use in a power distribution system for supplying a.c. power to a load from at least two supply conductors, one of such conductors being grounded at the source, comprising: differential current sensing means responsive to currents in said supply conductors for generating signals representing a differential current carried by said supply conductors; and phase-sensitive narrow band filter means adaptive to the frequency of said a.c. power for attenuating differential current signals which are of a different frequency then said a.c. power or which are out of phase with respect to said a.c. power and for integrating differential current signals of substantially the same frequency and phase of said a.c. power to derive an integrated signal representing the time integral of the resistive components of said differential current signals.

7. The phase-sensitive ground fault protective system of claim 6 wherein said phase-sensitive narrow band filter means comprises: a phase-sensitive demodulator responsive to the phase of said a.c. power and to said differential current signals for generating fault-characterizing signals; and an integrator for integrating said fault-characterizing signal to derive said integrated signal.

8. The phase-sensitive ground fault protective system of claim 6 further comprising circuit interrupting means for interrupting continuity through said supply conductors when said integrated signal exceeds a predetermined threshold value.

9. A phase-sensitive ground fault protective system for use in an electrical circuit for providing a.c. power to a load from at least two supply conductors, one of such conductors being grounded at the source, comprising: signal generating means comprising at least one closed magnetic circuit having a plurality of electrical windings thereon, each connected in series circuit with a respective one of said supply conductors and so wound about said magnetic circuit that the fluxes induced in said magnetic circuit due to normal currents in said supply conductors are in flux opposition; and means responsive to a net magnetic flux in said circuit and to the phase of alternating current potentials between said supply conductors for deriving a fault signal characterizing the resistive component of unbalanced ground fault currents.

10. The phase-sensitive ground fault protective system of claim 9 further comprising circuit interrupting means for interrupting circuit continuity between said load and said supply conductors in response to said fault signal.

11. The phase-sensitive ground fault protective system of claim 9 further comprising integrating means for deriving an integrated fault signal.

12. The phase-sensitive ground fault protective system of claim 11 further comprising means for interrupting circuit continuity between said load and said supply conductors in response to the attainment by said integrated fault signal of a predetermined threshold value.

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