The (110 pages) is the primary reference, covering: technical description, BLK 222 mechanism, and SF₆ gas system (filling at 0.5 MPa, includes density monitoring). It also includes erection and commissioning, operation and maintenance, spare parts (complete poles, contacts, gaskets, density switches), and safety regulations.
Lift poles using the designated lifting eyes; avoid side-loading the insulators. Gas Filling: Vacuum the interrupter to remove moisture. ltb 72.5-170d1 b manual
| Fault Symptom | Likely Cause (per manual) | Corrective Action (Reference Section) | | :--- | :--- | :--- | | Motor runs but spring does not charge | Broken gear train or sheared key in coupling | Replace coupling assembly (Section 7.3, Fig. 12) | | Close command ignored; no solenoid click | Auxiliary limit switch (LS1) stuck open | Clean/adjust LS1 cam (Section 5.6) | | Slow closing time (>70 ms) | Low spring tension or binding guide rods | Re-lubricate with Molykote G-3400 (Section 8.2) | | Manual charge handle slips | Worn ratchet pawl | Replace pawl spring (Part #170D1-B-44) | | Heater indicator off (if equipped) | Faulty anti-condensation heater | Check thermal fuse (Section 9.1, Wiring Diagram Sheet 3) | The (110 pages) is the primary reference, covering:
SF6 gas (typically 0.5 to 0.7 MPa abs depending on voltage and temperature ratings). Compliance: Designed and type-tested in accordance with IEC 62271-100 and IEEE standards. Hitachi Energy Publisher Core Components & Design Gas Filling: Vacuum the interrupter to remove moisture