Performing the Cable Test

DANGER
HAZARD OF ELECTRIC SHOCK, EXPLOSION OR ARC FLASH Ensure the test process & procedure as per latest IEC 62271-200. Apply appropriate PPE and follow safe work practices. This equipment must only be tested by qualified personnel. Make sure that the metallic components of the test adapter are at a sufficient distance from the earthed switchgear components (for example, housing). Failure to follow these instructions will result in death or serious injury.

DANGER

HAZARD OF ELECTRIC SHOCK, EXPLOSION OR ARC FLASH

Ensure the test process & procedure as per latest IEC 62271-200.
Apply appropriate PPE and follow safe work practices.
This equipment must only be tested by qualified personnel.
Make sure that the metallic components of the test adapter are at a sufficient distance from the earthed switchgear components (for example, housing).

Failure to follow these instructions will result in death or serious injury.

NOTE: Make sure that the metallic components of the test adapter are at a sufficient distance from the earthed switchgear components (for example, housing).

Connect the test adapter to a free cable connection in the cubicle and on the test unit. To this effect, observe the specifications of the test unit’s manufacturer.

Set switchgear cubicle to test position:

Table 16 Performing the Cable Test

Component	Test position
VCB	OFF
Trolley	In disconnected position
Earthing switch	OFF

NOTE: While performing cable test, comply with the admissible limits (see Table 17).

Perform cable test according to the cable manufacturer’s specifications.

Reposition the cable connection in the cable compartment:

Earth I/F cable again.
Remove test set.
Reconnect VT and surge arrester or de-earth them.
Reposition cable compartment cover.

Admissible Limits for the Cable Test in Cubicles

Table 17 Admissible Limits for the Cable

	DC test voltage [kV] max. 15 min.	AC – VLF test voltage (0.1 Hz) 60 min.
MCSeT (Ur = 24 kV)	48 kV⁽¹⁾⁽²⁾	36 kV⁽¹⁾⁽²⁾
72 kV⁽³⁾	54 kV⁽³⁾
⁽¹⁾ Category A: This category comprises those systems in which any phase conductor that comes in contact with earth or an earth conductor is disconnected from the system within 1 min. ⁽²⁾ Category B: This category comprises those systems which under fault conditions are operated for a short time with one phase earthed. This period according to IEC 60183, should not exceed 1 h. For cables covered by this standard, a longer period not exceeding 8 h on any occasion can be tolerated. The total duration of earth faults in any year should not exceed 125 h. ⁽³⁾ Category C: This category comprises all systems which do not fall into category A or B.

DC test voltage [kV] max. 15 min.

AC – VLF test voltage

(0.1 Hz) 60 min.

MCSeT (Ur = 24 kV)

48 kV⁽¹⁾⁽²⁾

36 kV⁽¹⁾⁽²⁾

72 kV⁽³⁾

54 kV⁽³⁾

⁽¹⁾ Category A: This category comprises those systems in which any phase conductor that comes in contact with earth or an earth conductor is disconnected from the system within 1 min.

⁽²⁾ Category B: This category comprises those systems which under fault conditions are operated for a short time with one phase earthed. This period according to IEC 60183, should not exceed 1 h. For cables covered by this standard, a longer period not exceeding 8 h on any occasion can be tolerated. The total duration of earth faults in any year should not exceed 125 h.

⁽³⁾ Category C: This category comprises all systems which do not fall into category A or B.

NOTE: A DC test may endanger the insulation system under test. Where possible an AC test should be used as described above.