Patent GB-157865-A (GB)
Title: Method of and means for regulating an electric central station and sub-station
Filed: 1921-01-10
Abstract: 157,865. Bosselmann, R. Sept. 15, 1919, [Convention datel. Boosting; equalizing load on generator; regulation, automatic systems and apparatus for.-A load equalizing system comprising a generator and a booster driven by the prime-mover is provided with a field regulator for the booster operated in accordance with the generator and booster output to maintain a constant load on the primemover. Means are provided for preventing overcharge and over-discharge of a battery working in conjunction with the booster and an auto. matic switching device is provided to place the field regulator under the control of the output of the generator and booster or under the control of the over-charge or over-discharge preventer. A generator D and booster Z are driven by a primemover and the booster field-winding is provided with a regulator F adapted to vary and reverse the current in the field-winding. The regulator F is operated by a motor M reversibly controlled by a relay A the coils a<6>, a<7> of which are adapted to be controlled either by a relay C or a relay E through the medium of a switch U. The relay C comprises a pivoted armature c<1> the position of which is controlled by a spring c<7>, a coil c<5> in the circuit of the generator D, a fixed coil c<8> in the circuit of the booster Z and a movable coil c<9> connected across the booster terminals. Under normal conditions the armature c<1> floats between contacts c<3>, c<4> and with the switch U in the position shown the relay C operates to control the motor M in accordance with the output of the generator D and booster Z and therefore in accordance with the load on the prime-mover. One of the cells of a battery B is provided with a float h<1> adapted to tilt a vessel h<2> containing mercury. Contacts h<4>, h<5>, h<6> are fused into the vessel h<2> and the central contact h<6> always dips into the mercury and is connected to a battery b<1>. The contacts h<4>, h<5> are connected respectively to the opposing movable coils e<8>, e<7> of a relay E and the other terminals of these coils are connected to the battery b<1> through the coils u<6>, u<5> of the switch U. The relay E is also provided with a fixed current coil e<6> surrounding its pivoted armature e<1>. Under normal conditions the contacts h<4>, h<5> do not engage the mercury in the vessel h<2> but when the battery is fully charged the mercury bridges the contacts h<5>, h<6> thereby energizing the coil e<7> of the relay E and the coil u<5> of the switch U. The armature e<1> engages the contact e<5> and the switch U operates to withdraw the contact u<9> from the cup u<12> and causes the contact u<11> to dip into the cup u<15>. This operation of the switch U removes the control of the coil a<6> of relay A from the relay C and the coil a' is energized to reduce the charging current of the battery. When the battery B is discharged to its lower limit the contacts h<4>, h<6> are bridged to energize the coil e<8> of the relay E and the coil u<6> of the switch U. The armature e' engages the contact e<5> and the switch U operates to withdraw the contact u<10> from the cup u<13> and causes the contact u<11> to dip into the cup u<14>. This operation of the switch U removes the control of the coil a<7> of the relay A from the relay C and the coil a<6> is energized to cause the battery to be charged. The Specification as open to inspection under Sect. 91 (3) (a) describes the arrangement of a booster driven by a rotary-converter, and the relay C is of the rotary field type. This subjectmatter does not appear in the Specification as accepted.