Electricity: electrical systems and devices – Safety and protection of systems and devices – With phase sequence network analyzer
Patent
1994-01-03
1996-10-29
Pellinen, A. D.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With phase sequence network analyzer
361 85, H02H 326
Patent
active
055702570
ABSTRACT:
A phase sequence protection circuit is shown in which first and second resistors (R1, R2) and a first capacitor (C1) all having equivalent impedance are connected in a Y configuration and coupled to power source leads (A, C, B) of a three phase power supply, resistor R1 being coupled to phase A, capacitor C1 to phase B and resistor R2 to phase C. A comparator network (12) is connected in line with the first resistor (R1) and, in one embodiment will cause a solid state switch (Q1) to conduct when the phases are out of sequence. In a second embodiment a buffer portion (COMP2) is provided to add switching hysteresis which also reverses the switching logic causing the solid state switch (Q1) to conduct when the phases are in sequence. In another embodiment the comparator network (12") is provided with the buffer portion (COMP2) for switching hysteresis and arranged to cause the solid state switch (Q1) to conduct when the phases are out of sequence. An opto-isolator (14) interfaces with the comparator network (12, 12', 12") to provide isolation. The signal from the opto-isolator in comparator network (12') controls the energization of a second solid state switch (Q2) and a relay coil (K1) used to energize a load.
REFERENCES:
patent: 4023075 (1977-05-01), Reuter
patent: 4196378 (1980-04-01), Shirai
patent: 4199798 (1980-04-01), Leppke et al.
patent: 4281358 (1981-07-01), Plouffe et al.
Carlos Mark C.
Manning William R.
Nacewicz Stanley J.
Baumann Russell E.
Donaldson Richard L.
Grossman Rene E.
Leja Ronald W.
Pellinen A. D.
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