IEEE 1732-2017 pdf download

IEEE 1732-2017 pdf download.IEEE Recommended Practice for Space Charge Measurements on High-Voltage Direct-Current Extruded Cables for Rated voltages up to 550 kV.
Two terminations. Laboratory terminations are acceptable provided that they do not give rise to any Ilashover during both the space charge measurements and the whole PQ test.
The two sequences of space charge measurements with the PEA method at the times established in 5.2. 1 shall not be perfhrmed on the same cable ioop. Indeed, the PEA method requires that the outer shielding layer of the cable is removed and the outer semiconductive layer of’ the cable is exposed; this modifies the dc-gassing rate and the effect of’ humidity on the cable loop subjected to space charge measurements compared to an unmeasured PQ test ioop. The two different cable loops for the two sequences of’ space charge measurements at the times established in 5.2.1 shall be obtained according to one of the two following alternative procedures:
a) The two cable loops shall be both obtained from the PQ test loop—provided that its initial overall length is sufficient—as follows:
I) The first sequence of space charge measurements with the PEA method at the first time established in 5.2.1 shall be performed at a location of the PQ test loop where the PEA set-up can he properly installed.
2) AfIer this first sequence of’ space charge measurements, the cable section where the PEA measurement cell is located shall be cut and removed. A joint shall be installed between the remaining cable ends, thereby preventing further degassing and humidity penetration in the cable insulation during the whole PQ test.
3) The long-duration voltage test of’the PQ test shall be carried out.
4) The second sequence of space charge measurements with the PEA method at the second time established in 5.2.1 shall be performed at a location of the PQ test ioop where the PEA set-up can be properly installed.
b) The cable loop for the first sequence of space charge measurements—made of a virgin cable identical to the cable employed in the PQ test loop [as prescribed in 5.2.1, item a)] and of length sufficient for the PEA set-up to be properly installed (as described in 5.2.2)—shall be different f’rorn the PQ test loop. The cable loop for the second sequence of measurements shall he the PQ test loop and the space charge measurements shall be performed at a location of the PQ test ioop where the PEA set-up can be properly installed.
NOTE—It is permitted to let the first cable loop undergo the whole PQ test leaving the PEA measurement cell on it to monitor space charge evolution during the PQ test and to compare it with the measurements carried out on the second cable loop after the completion of the PQ test.
5.2.3 Sequence of space charge measurements with the PEA method
Bef’ore each sequence of’ space charge measurements at the times established in 5.2.1, an adequate section of the outer semicon of the cable sample for space charge measurement with the PEA method (see 5.2.2) shall be exposed. The PEA measurement cell shall be installed at the exposed section of the outer scm icon. The measurements shall be made at ambient atmospheric conditions without extraneous precipitation or pollution (dry tests, see IEC 60060-1:2010, 4.2). The temperature and the humidity in the vicinity of’ the PEA measurement cell shall be monitored and recorded in the test report. All the required power and signal connections shall be set up by considering the safety of’ personnel and testing equipment. The sequence of space charge measurements shall then be accomplished according to the following steps.