11.75 The process of equipment aging, together with the regular addition of new plant to meet the accelerating development of water supply requirements, continued to increase divisional commitment in all areas of activity. Additional staff were requested to cope with new project requirements. A suitable site for a specialist workshop for medium and high voltage motor insulation repair and general overhauls was allocated and a comprehensive study of the proposal, including the possible integration of all workshop maintenance activities, was implemented.
Maintenance
11.76 The Maintenance Sub-division maintains equipment installed in 67 pumping stations, 14 treatment works and 74 minor installations. The total installed capacity of electric motors amounted to 71,616 kW, of which 52,844 (74%) comprise motors operating at 3,300 volts and above. The dearth of maintenance personnel of the right calibre in the electrical and instrumentation fields severely restricted maintenance capability, and manpower resources were deployed on strategic plant.
11.77 Major re-insulation of 4 high voltage motors was completed and work on a fifth commenced; one high voltage motor and 19 medium voltage motors were completely rewound; 220 motors were overhauled, of which 20 were high voltage. One high voltage motor was despatched to an overseas contractor for rewinding to a higher standard of insulation specification than the original, and a programme developed for rewinding three others in a similar manner.
11.78 Additional current transformers installed on the high voltage switchboard at Pui O Pumping Station developed faults and 69 more were rewound. Attention to a further six will complete the overhaul of all transformers currently installed.
11.79 With the installation of a new 250kVA standby diesel generator at Sha Tin Treatment Works, the original 70kVA unit was transferred to Tai Po Tau Pumping Station, releasing the 18kVA unit there for use at the slipway on Plover Cove Reservoir.
11.80 Part of the 8-panel switchboard, re-constructed from redundant components, was used to supply two motor-driven pumpsets installed in the temporary pumping station at Muk Wu, to facilitate increase of water supply from China. The power supply to the original station was re-organised to suit.
11.81 In conjunction with finalisation of the extension instrumentation contract on the Plover Cove Water Scheme an extensive exercise, involving 50% of the instrumentation staff, was mounted to rectify interface problems associated with existing plant not covered by the contract. This aggravated the staffing situation, disrupting the limited repair work undertaken by the instrument section.
11.82 Development of Sha Tin New Town and duplication of the KCR Railway line necessitated diversion of the telemetry cable linking Sha Tin Treatment Works with the Tai Po Tau and River Indus Pumping Stations. The cable was also relaid to suit construction of the new KCR Bridge No. 11 and repaired as a result of a hill fire near Tai Po. Alternatives to renewing the cable, by use of radio link or telephone lines, were under investigation.
141
11.75 The process of equipment aging, together with the regular addition of new plant to meet the accelerating development of water supply requirements, continued to increase divisional commitment in all areas of activity. Additional staff were requested to cope with new project requirements. A suitable site for a specialist workshop for medium and high voltage motor insulation repair and general overhauls was allocated and a comprehensive study of the proposal, including the possible integration of all workshop maintenance activities, was implemented.
Maintenance
11.76 The Maintenance Sub-division maintains equipment installed in 67 pumping stations, 14 treatment works and 74 minor installations. The total installed capacity of electric motors amounted to 71 616 kW, of which 52 844 (74%) comprise motors operating at 3 300 volts and above. The dearth of maintenance personnel of the right calibre in the electrical and instrumentation fields severely restricted maintenance capability, and manpower resources were deployed on strategic plant.
11.77 Major re-insulation of 4 high voltage motors was completed and work on a fifth commenced; one high voltage motor and 19 medium voltage motors were completely rewound; 220 motors were overhauled, of which 20 were high voltage. One high voltage motor was despatched to an overseas contractor for rewinding to a higher standard of insulation specification than the original, and a programme developed for rewinding three others in a similar manner.
11.78 Additional current transformers installed on the high voltage switchboard at Pui O Pumping Station developed faults and 69 more were rewound. Attention to a further six will complete the overhaul of all transformers currently installed.
11.79
With the installation of a new 250kVA standby diesel generator at Sha Tin Treatment Works, the original 70kVA unit was transferred to Tai Po Tau Fumping Station, releasing the 18kVA unit there for use at the slipway on Plover Cove Reservoir.
11.80
Part of the 8-panel switchboard, re-constructed from redundant components, was used to supply two motor-driven pumpsets installed in the temporary pumping station at Muk Wu, to facilitate increase of water supply from China. The power supply to the original station was re-organised to suit.
11.81
In conjunction with finalisation of the extension instrumentation contract on the Plover Cove Water Scheme an extensive exercise, involving 50% of the instrumentation staff, was mounted to rectify interface problems associated with existing plant not covered by the contract. This aggravated the staffing situation, disrupting the limited repair work undertaken by the instrument section.
11.82
Development of Sha Tin New Town and duplication of the KCR Railway line necessitated diversion of the telemetry cable linking Sha Tin Treatment Works with the Tai Po Tau and River Indus Pumping Stations. The cable was also relaid to suit construction of the new KCR Bridge No. 11 and repaired as a result of a hill fire near Tai Po. Alternatives to renewing the cable, by use of radio link or telephone lines, were under investigation.
141
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