31
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 4.
ISM
Short-circuit current
20 kA
25 kA
31.5 kA
L1, mm
ISM15_Shell_2(150_L)
700
450
300
ISM15_Shell_2(210_L)
ISM15_Shell_2(210_H)
980
630
420
ISM15_Shell_2(275_H)
1200
820
550
Maximum clearances due to electrodynamic forces
Table 4 - Additional support insulators installation minimum distances
Figure 46
ISM support insulators installation distance
Minimum clearances due to electromagnetic influence
To avoid primary current effect on ISM actuator, the minimum clearance between bus bars and the ISM frame
(Figure 47) should be no less than stated in the Table 5.
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...