To operate a relay ( I am calling "third relay") from two separate parallel control relays is called logic "or". Connect the power wire coming in to both of the paralleled relays' switch common contact. ( These relays are up to you to wire their coils and activate.) Depending on the logic required you will wire the third relay coil to the paralleled control relays normally open or normally closed contacts. That is: Do you you want the third relay to go on with the control relays activation or off?
Which one? There are several relay's on the Saturn. Relays are used to operate the horn, AC and fuel pump, to name a few.
The "pick up" of a relay is a setting at which the relay will begin to operate. Such as an overcurrent relay - if the pickup is set to 5A, when 5A is flowing through the relay, the relay will operate.
Impedance relays are used whenever over-current relays do not provide adequate protection. They function even if the short circuit current is relatively low. The speed of operation is independent of current magnitude. Impedance relays monitor the impedance between the relay location and the fault. If the impedance falls within the relay setting, the relay will operate. The basic construction for impedance relays on which the principle of operation is easily explained is the balanced beam.
They're completely different, used for different applications (usually). A distance relay uses both current and voltage. A differential relay uses only current. A differential relay usually has harmonic restraint capability, while distance relays ideally track system frequency. Differential relays require fast operation, while distance relays may not be required to operate as quickly. Distance relays have more issues with operating for out of zone problems than differential relays. There are many more, but this gives an idea.
Look on the side of the relay case. Here you will find the pin configurations for the C class contacts and the pins that connect to the relays coil to operate the relay.
Differential relays should only operate for faults within the zone of protection, so there is no coordination issue. The reason to coordinate relays is for backup protection (a relay at a remote substation sees faults that should be cleared by another relay, for example). A differential will not see this fault, since it is external to it's zone of protection.
A reverse power relay is a directional overcurrent relay. Directional relays are relays that sense power flow in one direction, and include (directional) overcurrent relays, reverse power, and impedance based relays. So a reverse power relay is a directional relay, but a directional relay is not necessarily a reverse power relay.
Relays.
In the relay box under the bonnet.I think later Corsa's have two relays,one for left turn and one for right.If no problem and you just want to locate these relays,remove box lid and switch indicators on.Feel for the click as they operate.
The plural form of 'relay' is 'relays.' :)
automotive relays
Low voltage to operate relay controlling high CURRENT circuits (currant is a dried fruit).