Transmission Line, Transformer & Protection Laboratory

In the electricity grid’s power lines and cables, electricity is transported from the power plants to industries and housing. On the way it passes a number of stations where it is converted and distributed, all the way to our electrical outlets.

In this chain of transformers and power lines, losses occur, in addition various faults such as interruptions, short circuits, earth faults etc. With TERCO’s training materials for line models, transformers and protective relays, you gain practical knowledge in the field.

Line Models

The following Line Models and Cable Model are designed for realistic conditions, such as overvoltage, overcurrent, and a certain magnetic coupling between the wires.

As linear behaviour for excess values is required, the line inductances must be represented by non-saturable induction coils. To withstand certain overvoltages, overdimensioning of wiring and capacitors is necessary.

One of the overhead models is representing a high voltage line of 220 kV, and the other a feeder at medium level 40 kV. All models are constructed as π-links, the HV model and the cable model as adouble π-link.

Flexibility to simulate typical situations, such as compensating a long line at both ends and also in the middle, must also be available. Combination of the π-links make it possible to create other characteristic data, e.g. capacitors can be connected in ∆ instead of Y.