# Speed Rise Following Load Reduction Calculator

Posted by Dinesh onOnline calculator to calculate sudden **speed rise** in the electrical system that a hydraulic turbine serves using turbine speed drop formula.

## Speed Rise Following Load Reduction Calculation

### Formula:

n_{t}/n (in USCS) = [1 + 1,620,000T_{t}P_{t} / WR^{2}n^{2} (1 + h/H)^{3/2}]^{1/2}

n_{t}/n (in SI) = [1 + 365,000T_{t}P_{t} / GD^{2}n^{2} (1 + h/H)^{3/2}]^{1/2}

where,

n_{t} - is the speed, at the end of time T_{t}

T_{t} - the time interval

P_{t} - reduction in load

WR^{2} is the product of the revolving parts weight, lb, and the square of their radius of gyration, ft

n - is the speed

h is the head rise caused by the retardation of the flow

H is the net effective head before the load change

GD^{2} is the product of the revolving parts weight, and the square of their diameter of gyration, m.