Type II Coordination in Power Distribution

As to general philosophy, in cases of fault you want the lowest-voltage and closest-to-the-load protective devices to trip before the "bigger" stuff trips. In other words, localize faults to the smallest practical scope.

This entails some study of the trip characteristics (magnitude of fault current versus time to trip) of the various devices, working backward "up the line."

yes as Tonado mentioned it the nearest rating of supply which will trip the breaker

The general philosophy for effective control and reliability of power supply is to put in place proper measures to ensure that your final circuits receive normal voltage inputs,parameters and safety devices to enable them work smoothly and achieve end results.

U have to ensure that voltages less than 415volts are tapped properly to respective loads with necessary protection,while those using 415v are also protected,likewise providing protection as per 11kv and then making sure that your 110kv is not droping and fluctuating below acceptable limit.

Patrick Whowha

I am afraid your usage of the terminology "Type 2 Co-ordination" is not very correct here. Because, as per IEC 60947 (Specifications for Low Voltage Switchgear), Type 2 Co-ordination is applicable only to Low Voltage Switchgear & Controlgear. In MV, HV & EHV, you simply call "Relay Co-ordination", which is covered in IEC 60255.

As for the philosophy, as has been rightly pointed out by earlier experts, the lowest voltage system should trip first on a fault at that level, and then progressively delay tripping of upstream systems.