1. Vacuum circuit breaker’s solenoid force evaluation 29/12/2009

2. Deliverable 1 Report on the compliance of the brand new trip coil and close coil to specification and their safety factors as derived from the laboratory experiments

3. EPE Switchgear -11 & 33KV Closing and Opening Coil 32 mm Pull gauge coil Stopper block Plunger Trip hook/strike

4. EPE solenoid Force and Stroke Relationship ! μ o is the Permeability of free space N is the number of coil turns A is the effective cross sectional i is the max current x is the stroke length of the plunger N.B. Data sheet of the coil attached in appendix ! A. E. Fitzgerald, Electric Machinery: The process, devices and systems of electromechanical energy conversion, McGraw Hill 1971

5. ETAH solenoid Force and Stroke Relationship ! μ o is the Permeability of free space N is the number of coil turns A is the effective cross sectional i is the max current x is the stroke length of the plunger N.B. Data sheet of the coil attached in appendix ! A. E. Fitzgerald, Electric Machinery: The process, devices and systems of electromechanical energy conversion, McGraw Hill 1971

6. Stroke length (x) mm Force in Kgf EPE Solenoid Force & Amps vs Plunger position

7. Force in Kgf TAMC) (ETAH) Solenoid Force & Amps vs Plunger position Stroke length (x) mm

8. Photo Gallery Force test for EPE 11KV New Solenoid testing

9. Force test for EPE 33KV Force test for TAMCO 11KV

11. Appendix – Solenoid Data Sheet