Solid state overload relay

Details Solid state overload relay Solid state overload relay

1990-08-02

1993-01-12

Skudy, R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

H02H 300, H02H 700, H02H 902

Patent

active

051794950

ABSTRACT:
A self-powered multiple phase cirucit protection device including a plurality of current transformers (16, 18, 20) connected and parallel with each other and adapted to be individually associated with one phase (10, 12, 14) of a multiple phase load and for providing signals I.sub.a I.sub.b, I.sub.c representing the current flowing in an associated phase. A switch (62) is adapted to be actuated to interrupt power to the multiple phase load and a fault determining circuit (45) is connected to the circuit transformers (16, 18, 20) and to the switch (62) for actuating the switch (62) for at least one predetermined condition of the current signals I.sub.a, I.sub.b, I.sub.c. A power supply (34) is provided for the fault determining circuit (45) and has an input connected to all of the current sensors and an electrical clamp (36) is connected to the power supply input.

REFERENCES:
patent: 4041540 (1977-08-01), Kampf et al.
patent: 4048663 (1977-09-01), Lemke
patent: 4054932 (1977-10-01), Sehmer et al.
patent: 4345288 (1982-08-01), Kampf et al.
patent: 4446498 (1984-05-01), Stich
patent: 4539618 (1985-09-01), Stich
patent: 4630163 (1986-12-01), Cooper et al.
patent: 4901005 (1990-02-01), Shin et al.

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