Hi everyone,
I am working on a project that has a 1.5 km of transmission line feeding a 230kV substation with a disconnect switch, breaker and a 230kV/35kV transformer. I understand we need to install a surge arrestor in front of the transformer to protect it, but would there be one needed in...
Hi,
I have a question about the machine(torque)angles in synchronous motors with exciters.The sync motor is a 6500hp 36 pole motor @ 4.16kV, which is started as an induction machine.The load is a high inertia load which gets engaged when the moor reaches sync speed.
When the motor is running...
Hi,
I have a 12.47kV/4.16kV 5MVA delta-wye(10A,10s resistive grounded system) feeding a 5kV switchgear. The NGR is rated for 10A, 10s and I am using SEL-751A protection relays.
1) A ground fault on the secondary of the transformer would be seen by the primary as L-L fault?
2) How would this...
Hi,
I have a SEL 710 protection relay that protects a VFD (with an isolation transformer) and 700HP motor. There are fuses on the line side of the VFD for short circuit protection and contactors( controlled by SEL 710)for opening/closing the circuit. I am not an expert, so please correct me...
Hi,
This has been a very good learning forum and I hope to learn a lot from you guys. Thus my first post & the question
I am installing 4 X single conductor 600V 750MCM teck cables in a cable tray( hot dipped galvanized steel) which would be bonded at every 15m. These cables would be installed...
