Published On: Sat, Jul 6th, 2019

Basic solutions of medium voltage distribution electrical networks of 10 kV

Author and drawing: Radoje Jankovic

When considering the scope and characteristics of the 10 kV switchgears  in the 35/10 kV Electrical Distributive Transformer Station (EDTS)  (Note: this also applies to all other voltages applied in various countries worldwide according to their technical regulations) with the basic settings of the electrical network 10 kV, one should bear in mind:

– Operation of the 10 kV network as non-earthed. 

– Operation of the 10 kV network as open. 

– 10 kV network operation with introduced local and remote automation in electrical distribution substations (EDTS) 35/10 kV, as follows:

1. Reduction of 10 kV lines in overloading the transformer and re-starting the same lines after the overload failure, all according to a predetermined program.

  • In case of voltage failure (shutdown) on the 10 kV busbars,  switching off the lines and restarting after the voltage condition is established.

In any case, the network will operate in this way without local or remote automation, but with automatic and remote control a much better technical and economic effect is achieved.

The solutions of the 10 kV network should also take into account the possibility of introducing remote control and control, and especially the good features that the network receives with them. However, the operation of networks is enabled without remote control and control, however, solutions should be set up to enable the introduction of this and to make the most efficient use of it.

The basic settings of the 10 kV network solution are shown in Fig. 1 to Fig. 5, and the basic variants of the 10 kV network solution in Fig. 6 to Fig. 10.

All the 10 kV network settings shown are based on the following:

– Each 10 kV feeder out of the EDTS 35/10 kV in normal operation supplies the same number of transformer stations (TS) 10 / 0,4 kV that can carry the corresponding cross section of the conductor, which is adopted as a standard one.

– In the event of a malfunction on the main power supply, the power supply is automatically taken over by a spare line, which comes in most cases from the same EDTS 35/10 kV, or from another.

– If the number TS 10 / 0,4 kV is such, in case the network operation is assumed to be 10 kV, that the transmission power of the supply line is fully used, in that case the spare line is completely free, Figure 1-5. Incomplete utilization of the transmission power of line, and under the assumption of such work that there is no peak load in the fault of the fault, then there is the possibility of another number of TS 10 / 0.4 kV on the reserve water as can be seen from Fig. 2 – 5.

– Distribution transformer stations (n + 1) are usually used to separate the network so that it can work as a separate one.

Later, we will talk about the volume of some 10 kV low voltage facilities that can be applied to all voltages up to 20 kV and below 20 kV, depending on the standardized voltage levels in some countries of the world.

References: Jankovic’s documentation.

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Basic solutions of medium voltage distribution electrical networks of 10 kV