Pursuant to Article 116 of the Energy Law

POWER
 
ABSORPTION
 
FROM
 
TRANSMISSION
 
GRID 
4.2.6.1. Users of transmission grid should secure conditions during regular operation of their 
facilities in such a way that the reactive and active power ration absorbed from the 
transmission grid in the connection/inter-connection point is below 0.33 at each 15 min 
interval, with the measuring system registering interchange of reactive and active energy 
except for the points where generation units are connected in accordance with the Grid Code 
and section 4.3.7.
4.2.7.
 
QUALITY
 
OF
 
THE
 
VOLTAGE
 
WAVE 
4.2.7.1. Current asymmetry  
4.2.7.1.1. The current asymmetry caused by the facility of transmission system user must not 
exceed: 
- 2% if the facility is connected/inter-connected to the 110 kV grid; 
- 1.4% if the facility is connected to the 220 kV grid. 
- 
0.8% if the facility is connected to the 400 kVgrid. 
4.2.7.1.2. Exceptionally, for facilities connected to the 110 kV grid supplying the railways (so 
called electro-traction substation) the JSC EMS may, in its Technical Conditions for 
Connecting to the Grid, require current asymmetry higher than 2% provided that this does not 
hinder access of other users to the transmission system, i.e. that it does not violate the 
preconditions for normal operation of the power system. 

---

31 
4.2.7.2. Higher harmonics 
4.2.7.2.1. The higher harmonic currents generated by the facility of transmission system user 
at its connecting point in 110 kV and 220 kV grids must not exceed values: 
nom
s
n
hn
U
S
k
I
3

where: 
Ihn
– n harmonic current; 
kn
– coefficient factor of n harmonic (determined in accordance with the Table 4.1); 
Ss
– max apparent power at the connection/interconnection point (calculated based on 
allowed power demand and power factor) in case that it is less than 5% of apparent power 
of three phase short-circuit connection, otherwise 
Ss
is 5% of the apparent power of three 
phase short-circuit connection;
Unom
– nominal voltage of the transmission grid at the connection/inter-connection point. 
4.2.7.2.2. If the facility is connected to the 400 kV grid, the obtained values of currents 
Ihn
from the point 4.2.7.2.1. are multiplied by 0.6.
Table 4.1 
No. of odd 
harmonic 
k
n 
[%]
No. of even 
harmonic 
k
n 
[%]
k
n 
[%]
3 
6.5 
2 
3 
Total 
8 
5 and 7 
8 
2 
1.5 



40
2
2
n
n
g
k
Т
9 
3 

4 
1 
11 and 13 
5 

13 
3