Drive circuit for the trip actuator of a network protector and a network protector incorporating the same
US6459554B1 · kind B1 · utility
11Cited by
6References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 5, 2000 |
| Grant date | Oct 1, 2002 |
| Priority date | — |
| Expiry date | Feb 21, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H2083/203
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A network protector includes a coil drive circuit for the trip actuator which operates as a current limiter to protect a trip coil with limited impedance at the upper limit of network voltage while assuring operation at network voltages of less than 10% rated voltage. A comparator provides gate drive current to a FET connected in series with the trip coil as long as coil current is below a reference voltage proportional to a specified maximum value of coil current. When the specified value of coil current is reached, the FET is latched off until the network protector is tripped open again.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.