BS IEC 63075 pdf free download
BS IEC 63075-2019 pdf free download.Superconducting AC power cables and their accessories for rated voltages from 6 kV to 500 kV – Test methods and requirements.
5 Cable materials
5.1 Cable conductor materials
This document is applicable to cables having a conductor consisting of HTS material. In addition, the cable conductor may comprise metal.
NOTE Commonly used HTS materials for the cable conductor are copper-oxide superconduclors (see IEC 60050-
815:2015. 815-11-08) in the form of tapes.
5.2 Cable insulating materials (dielectric insulation)
This document is applicable to cables having a cold dielectric consisting of lapped insulating tapes impregnated with the cryogen.
NOTE 1 Commonly used insulating tapes are kraft paper, polypropylene laminated paper. etc
NOTE 2 Commonly used cryogen is liquid nitrogen.
5.3 Cable screen materials
This document is applicable to cables having a screen consisting of either HTS material or
metal or a combination of both.
NOTE Commonly used HTS materials for the cable screen are copper-oxide superconductors (see IEC 60050-
815:2015. 815-11-08) in the form of tapes
5.4 Cable cryostat materials (thermal insulation)
This document is applicable to cables having a cryostat consisting of an inner envelope at cryogenic temperature and an outer envelope at ambient temperature with a thermal insulation in between.
NOTE The cable cryostat generally consists of an inner and outer tube made of stainless steel or aluminium alloys with a vacuum insulation in between
5.5 Cable oversheathing materials (outside cryostat) The oversheath is optional.
If an oversheath is required (e.g. using the cryostat as metal screen), it shall be tested.
Tests are specified for the following types of oversheath:
— ST1 and ST2 based on polyvinyl chloride (PVC);
— ST3 and ST7 based on polyethylene (PE).
The choice of the type of oversheath will depend on the design of the cable and on the mechanical, thermal and fire constraints during installation and operation.
6 Cable characteristics
For the purposes of carrying out the cable system tests described in this document and recording the results, the cable shall be identified. The following characteristics shall be known or declared:
a) name of manufacturer, type, designation and manufacturing date or date code;
b) rated voltage: values shall be given for L0, U, Ufl (see 4.1 and 8.4);
C) rated operating current: value shall be given for 1r
d) maximum and minimum operating temperature of cryogen shall be given;
BS IEC 63075:2019
IEC 63075:2019 IEC 2019 — 15—
e) maximum and minimum operating pressure of cryogen shall be given;
f) maximum allowable working pressure of the system shall be given;
g) type of HTS material, number of HTS tapes in each phase conductor, if applicable nominal cross-section and type of metal conductor in each phase conductor, design critical current of each phase conductor at 77,3 K and function of its temperature dependency;
h) material and minimum thickness of insulation (‘man) (see 5.2);
I) type of cryogen;
j) if applicable, type of HTS material, number of HTS tapes in cable screen and/or nominal cross-section and type of metal conductor in cable screen, design critical current of screen conductor at 77,3 K and function of its temperature dependency;
k) nominal diameter of the cable core (d);
I) nominal inner diameter of the cable cryostat (D1);
m) material and type of cryostat and type of thermal insulation;
n) if applicable, material and nominal thickness of oversheath;
o) nominal overall diameter of the cable (D) (outside the cryostat or oversheath);
p) nominal inner diameter (d11) and calculated minimum outer diameter (D,0) of the insulation;
q) minimum bend diameter;
r) nominal capacitance, corrected to 1 km length, and loss angle (tan o) between conductor screen and insulation screen for each dielectric in the cable core;
5) calculated maximum electrical stress at conductor screen (E1) and at insulation screen
where
= U0 for single core, three core and the outer phase of three phase concentric cables;
= U for the inner and middle phase of three phase concentric cables:
= d1 + 2lmin:
is the declared nominal inner diameter of the insulation;
is the calculated minimum outer diameter of the insulation;
tmin is the declared minimum insulation thickness.
The values of U0 and of U are given in Table 1.
7 Accessory characteristics
For the purposes of carrying out the cable system or accessory tests described in this document and recording the results, the accessory shall be identified.
The following characteristics shall be known or declared:
a) cables used for testing accessories shall be correctly identified, as in Clause 6:
b) accessories to be tested shall be correctly identified with respect to
— name of manufacturer.BS IEC 63075 pdf download.
