27
1
Nine internal threads for obligatory ISM fixing which are formed
in the module support insulator (M12, torque 40±2 Nm).
2 Eight threads on both sides of the frame for optional ISM fixing
(M8, torque is 10±1 Nm).
Ensure that the frame to which the ISM will be fixed does not
create static load to the switching module. Then fasten the nine
bolts (Figure 39; torque is 40±2 Nm).
1
2
Figure 38
HD ISM mounting diagram
Figure 39
Example of HD ISM fixation
4.1.3 Main terminal connections of LD ISM
Primary terminals connection
Bus bars can be connected to terminals of LD ISM by means of M10 screws. M10 bolts and nuts fixing busbars to
LD ISM terminals should be tightened with a torque of 30±3 Nm. To connect bus bars to lower terminal of
ISM15_LD_1(90) M8 bolt should be used with a torque of 10±1 Nm.
To prevent static load to the ISM poles it is not allowed to fasten busbars to the LD ISM terminal if there is a gap
of more than one millimeter between the busbar and the ISM terminal just before this fastening. Bars shall be
accurately prepared to avoid bending and (or) twisting forces to terminals when these bars are fastened.
Maximum clearances due to electrodynamic forces
To avoid unacceptable high electrodynamic impact on the ISM, additional support insulators are required if the
unsupported busbars are longer than specified in the Table 2.
ISM
Short-circuit current
16 kA
20 kA
L1, mm
ISM15_LD_1
980
700
ISM25_LD_1
980
NA
Table 2 - Additional support insulators installation minimum distances
Summary of Contents for TAVRIDA ELECTRIC VCB15 LD
Page 1: ...VCB Vacuum Circuit Breaker 17 5kV 31 5kA 2000A 24kV 16kA 800A User Guide...
Page 3: ...1 Product description...
Page 7: ...2 Nameplates and seals...
Page 11: ...3 Product handling...
Page 23: ...4 Installation...
Page 50: ...5 Commissioning...
Page 57: ...6 Operation...
Page 61: ...7 Maintenance and troubleshooting...
Page 66: ...8 Disposal...
Page 68: ...Appendix 1 Product range...
Page 71: ...Appendix 2 Overall drawings...
Page 74: ...75 ISM15_LD_3 Weight 13 kg ISM15_LD_6 PCD 133 mm Weight 55 kg...
Page 81: ...82 ISM25_LD_2 1 PCD 150 mm Weight 35 kg ISM25_LD_2 2 PCD 150 mm Weight 37 kg...
Page 85: ...Appendix 3 Secondary schemes...
Page 86: ...87...
Page 87: ...88...
Page 88: ...89...
Page 89: ...90...
Page 90: ...91...
Page 91: ...92...
Page 92: ...93...
