**7. Results**

In this section, some results from the measurement campaigns will be showed to enhance the understanding of the disturbances. These figures are extracted from real measurements. In order to publish them, location information is not included as well as any other information regarding the date or line where they were acquired.

Figure 9 shows the registered current in the feeder station during one measurement interval. The peak current is 1689 A that means an rms value of 1194 Arms. This is quite close of the above referred value of 1200 Arms.

Fig. 9. Shortcut current as recorded in feeder station facility

Fig. 10. Graphical representations of the measurements around one signal

For Figure 9 current values, Figure 10 offers the registered values for a series of measurement items nearby a signal the measured items were:

• Signal (blue)

180 Electrical Generation and Distribution Systems and Power Quality Disturbances

**End A End B**

<sup>A</sup> <sup>A</sup>

A A A

Fig. 8. Measurement scheme for communication wires used in the measurement campaigns

In this section, some results from the measurement campaigns will be showed to enhance the understanding of the disturbances. These figures are extracted from real measurements. In order to publish them, location information is not included as well as any other

Figure 9 shows the registered current in the feeder station during one measurement interval. The peak current is 1689 A that means an rms value of 1194 Arms. This is quite close of the

Current from a pair of wires to the shielding Current between the shielding and earth Current between the shielding and earth

ELECTROSTATIC SHIELD

500 Ω 500 Ω

A

ELECTROMAGNETIC SHIELD

V

V

Differential voltage Common mode voltage

500 Ω

V

V V V

by CITEF

**7. Results** 

ELECTROMAGNETIC SHIELD

information regarding the date or line where they were acquired.

Fig. 9. Shortcut current as recorded in feeder station facility

Common mode voltage referred to the shielding

above referred value of 1200 Arms.

ELECTROSTATIC SHIELD


And the measured rms values were:


Some of the items measured had a 10/1 reduction probe. In this case both rails have this relation. This example shows in a very visual way that the effects described in the above sections do occur. These items were measured according to the EN 50122-1 described methodology and some of the obtained values overpass the limits described in the standard. This example shows in a very clear way that the effect does exist and that measures have to be adopted in order to prevent their effects. That figure shows the effect in elements that have to be protected against direct contact.
