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January, 1934
Electric Winders, Boldon Colliery
We are now in a position to give the schedule of characteristics relating to the electrical winders at Boldon Colliery.
It will be recalled that we gave an account of these winders in an article describing the electrification of the Harton Coal Company’s pits in our December issue. At that time the particulars were not available, and we now have pleasure in completing our account by the publication of these figures.
| Boldon No. 1 Winder. | |
| Supply | 5,500-volts. 40-per. 3 ph. |
| Depth | 1,560 ft. |
| Weight of cage and chains | 4¼ tons. |
| No. of decks | 3. |
| Net load | 3.35 tons (min.). |
| Type of rope | Locked coil. |
| Circumference | 4 in. |
| Weight per fathom | 24 lb. |
| Static safety factor | 8.7. |
| Angling at start | 1 in 47.2. |
| Angling at end | 1 in 36.5. |
| System of decking | Simultaneous. |
| Type of drum | B.C.C. |
| Diameters | 10/14 ft. |
| Turns | 4 + 4 + 29.2. |
| Drum speed | 30. 1 r.p.m. |
| M.I. of drum and gears | 70,000-lb. ft. units. |
| Brakes | Air operated. |
| Time accelerating | 16 sec. |
| Full speed | 58 |
| Retarding | 16 |
| Decking | 30 |
| Consumption per trip | 7.0 kwh. |
| Motor — | |
| R.m.s. rating | 380-h.p. 2,700-volts. |
| Speed | 285 r.p.m. |
| Max. torque | 2 x f.l.t. |
| Controller dissipating capacity | 150-h.p. |
| Main switch rupturing capacity | 25,000-kVA. |
| Main transformer | 380-kVA. 5,500/2,700-volts. |
| Auxiliary transformer | 20-kVA. 2,700/600-volts. |
| Boldon No. 2 Winder. | |
| Supply | 5,500-volts. 40-per. 3-ph. |
| Depth | 1,560 ft. |
| Weight of cage and chains | 5 tons 18 cwt. |
| No. of decks | 4. |
| No. of tubs per deck | 2. |
| Weight of empty tub | 6 cwt. |
| Weight of coal per tub | 12½ cwt. |
| Weight of coal per cage | 5 tons. |
| Type of rope | Locked coil. |
| Circumference | 5 in. |
| Weight per fathom | 37½ lb. |
| Tail rope | Flat, 6¾ in. x 13/16 ,in. |
| Weight per fathom | 42 lb. |
| Static safety factor of winding rope | 7. |
| Angling at start | 1 in 50. |
| Angling at end | 1 in 125. |
| System of decking | Quadruple at first ; double eventually. |
| Type of drum | Cylindrical. |
| Diameter | 16 ft. |
| Turns | 31. |
| Drum speed | 45.4 r.p.m. |
| M.I. of drum and gears | 150,000 lb. ft. units. |
| Brakes | Oil operated. |
| Time — | |
| Accelerating | 10 sec. |
| Full speed | 32 |
| Retarding | 8 |
| Decking | 52 |
| Consumption per trip | |
| Winder motor — | |
| R.m.s. rating | 1,860-h.p. 600-volts. d.c. |
| Speed | 400 r.p.m. |
| Max. torque | 2 x f.l.t. |
| Generator — | |
| R.m.s. rating | 1,200-kW. |
| Max. current | 2½ x f.l.c. |
| Synchronous motor — | |
| R.m.s. rating | 1,200-h.p. |
| Max. power | 3½ x f.l. |
Article reproduced from a copy of the magazine held at National Mining Museum Scotland, Newtongrange, Midlothian.
Contains public sector information licensed under the 
