Trip circuit for adjusting tripping characteristics of protective relays
AssigneeSaudi Arabian Oil Company
InventorHussain Adnan Alawami
Life of this patent
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Abstract
A trip circuit for protecting a power distribution system includes a trip coil. The trip coil includes a first coil terminal coupled to a first bus line. Moreover the trip circuit includes a self-power relay that provides energy to the first bus line and a second bus line. Further, the trip circuit includes a normal setting contact and a reduced setting contact each coupled to the second bus line and a second coil terminal of the trip coil in parallel. The self-power relay provides energy to the first and second bus line via Impulse Outputs (POs). Additionally, the switch can control whether the trip circuit operates in a normal setting or a reduced setting.
Claims14
A trip circuit comprising:
- a trip coil with a first coil terminal coupled to a first bus line;
- a self-power relay that provides energy to the first bus line and a second bus line
- a normal setting contact and a reduced setting contact each coupled to the second bus line and a second coil terminal of the trip coil in parallel;
- and
- a first output contact in series with the normal setting contact and a second output contact in series with the reduced setting contact.
A trip circuit for protecting a power distribution system comprising:
- a trip coil with a first coil terminal coupled to a first bus line and a second coil terminal coupled to a first Binary Output (BO) terminal of a first subset of BOs of a self-power relay;
- a switch having a first switch terminal coupled to the second coil terminal and a second switch terminal coupled to a second BO terminal of the first subset of BOs of the self-power relay and a second bus line, wherein the self-power relay provides energy to the first and second bus line via Impulse Outputs (POs).
Dependencies are inferred from the claim text.