Improvements in or relating to Electric Supply Apparatus, such as Alternators, Transformers, and Electric Circuits.
Year: 1894

page_text: Date of Application, 8th Mar., 1894
Complete Specification Left, 8th Jan., 1895-Accepted, 8th Mar.. 1895
PROVISIONAL SPECIFICATION.
Improvements in or relating to Electric Supply Apparatus, such as
Alternators, Transformers, and Electric Circuits.
J, WILLIAM MORRIS MORDEY, of 49 Queen Victoria Street, in the City
of London, Electrician, do hereby declare the nature of this invention to be as
follows:-
An object of this invention is to prevent or reduce the pulsation of current in
alternators working in parallel. For this purpose I use a device which I term
a Steadier" and which is in the form of a transformer, having usually a primary
winding arranged as a shunt on the external circuit, and one or more secondary
windings placed in the armature circuit or circuits. The latter winding or windings
is or are preferably so connected as to impress an E.M.F. on the circuit in the same
direction as the armatures and therefore in a direction to resist the passage of
a current in the opposite direction.
A fixed resistance, or a choking coil may sometimes be placed in the primary
circuit for the purpose of causing the Steadier to act with increased effect for
excessive variation. Two Steadiers such as described may also be sometimes used
one arranged to have an opposing and the other an assisting E.M.F. and so
neutralizing one another's effect on the circuit as a whole so long as the alternate
current is not excessive, but both exerting a choking or impeding effect in the case
of an excessive current traversing them.
A steadying device such as described may also be used for other purposes, as for
example as a means of supplying a number of circuits requiring different E.M.F.'s
for which purpose the secondary windings are connected to the said circuits, and
arranged in such a way as to produce the desired variation.
The effect of the primary winding may be capable of variation through wide
limits to suit the conditions of working, and for great tendency to pulsations it may
be removed altogether, the effect of the winding carrying the armature current
being controlled by a shunt, or preferably by a separate coil, wound on the same
core and connected to a suitable variable circuit.
A further application of this invention is for the purpose of controlling the
output of a number of transformers connected in parallel. To counteract any
tendency on the part of the transformers to distribute the load unequally, or in
undesirable proportions, they are connected to the main through apparatus of the
kind hereinbefore described. Or two of these apparatus may be used, one placed
in the primary and one in the secondary circuits of the transformers, and in cases
where it is not desired to interfere with the normal E.M.F. of supply, one of the
said devices may be made to have an opposing and the other an assisting E.M.F.
Dated this 8th day of March 1894.

page_text: Improvements in or relating to Electric Supply Apparatus, such as.
Alternators, Transformers, and Electric Circuits.
1, WILLIAM MORRIS MORDEY, of 49 Queen Victoria Street, in the City of..
London, Electrician, do hereby declare the nature of this invention and in what
manner the same is to be performed to be particularly described and ascertained in
and by the following statement :-
An object of this invention is to prevent or reduce the pulsation of current
in alternators working in parallel. For this purpose I use a device which I term
a "Steadier and which is in the form of a transformer, that is, comprising
a laminated iron structure on which the winding is placed. Usually a primary
winding is provided arranged as a shunt on the external circuit, and one or more
secondary windings placed in the armature circuit or circuits. The latter winding
or windings is or are preferably so connected as to impress an E.M.F. on the
circuit in the same direction as the armature and therefore in a direction to resist
the passage of a current in the opposite direction.
Fig. 1 of the accompanying drawings is a diagrammatic view showing an
arrangement of this kind, wherein A is an alternator, X a Steadier comprising a
core e with primary winding p and secondary winding s and M M the mains
supplied by the alternator. L is a fixed resistance or choking coil which may be
placed in the primary circuit for the purpose of causing the Steadier to act with
increased effect for excessive variation. Two Steadiers such as described may be
used as shown diagrammatically in Fig. 2, one, viz. X being arranged to have an
opposing, and the other X' an assisting E.M.F. and so neutralizing one another's
effect on the E.M.F. of the circuit as a whole so long as the alternate current is not
excessive, but both acting to exert a choking or impeding effect in the case of an
excessive current traversing them.
The effect of the primary winding p may be capable of variation through wide
limits to suit the conditions of working, and (especially for great tendency to
pulsation) it may be removed altogether. The effect of the winding s carrying the
armature current, may in this case be controlled by a shunt or by a separate coil
wound on the same core and connected to a suitable variable circuit, which may be
controlled by hanil or by any automatic means such as an electro-magnetic switch or
a fuse.
Fig. 3 shows such an arrangement of a Steadier having only one winding s which
may be shunted by a resistance at r capable of variation by hand or automatically.
This resistance may be very small under normal conditions so that practically the
whole current will pass through it, and it may be varied up to any desired amount
so as to cause more or less of the current to pass through the said winding s.
simplest means for obtaining variation, and that giving the maximum range, is
a fuse, or a hand or automatic switch. The variation may be made gradually by
the use of two or more fuses or switches.
Fig. 4 shows the variable resistance placed in a secondary circuit s'.
P
The
A similar result to that obtained by the arrangements shown in Figs. 3 and 4 may
be obtained with the arrangements shown in Figs. 1 and 2 by placing a fuse in
the primary circuit p of the Steadier (Fig. 1) or of each of them (Fig. 2) so that
when the current passing through such winding, or windings, becomes excessive and
the fuse acts, the effect is to remove the action of the primary winding or windings
from the steadying device and so allow the winding s to act alone.
A further application cf this invention is shown in Fig. 5 and is for the purpose
of controlling the output of a number of transformers T', T", T₁ connected in
parallel. To counteract any tendency on the part of the transformers to distribute

page_text: the load unequally or in undesirable proportions, they are connected either to the
primary or to the secondary main through controlling apparatus of the kind
herein before described. In Fig. 5 the secondary windings of such apparatus are
shewn in the secondary circuits of the transformers, P¹ P", P¹¹ and S', S", S
being the primary and secondary windings respectively of the transformers.
Or two of these controlling apparatus may be used, one placed in the primary and
one in the secondary circuits of the transformers, and in cases where it is not
desired to interfere with the normal E.M.F. of supply, one of the said devices may
be made to have an opposing and the other an assisting E.M.F. as is the case in the
arrangement shown in Fig. 2 as applied to an alternator. In Fig. 5 p is the primary
of the controlling apparatus or Steadier X, the several secondary windings of such
apparatus being shown at s', 1, 111, these windings being all on an iron core c
common to them. This arrangement (Fig. 5) is also applicable to the case of
a number of alternators connected in parallel.
A steadying device such as described may also be used for other purposes, for
example as shown in Fig. 6, as a means of supplying a number of circuits M_M',
M M, M M requiring different E.M.F.'s for which purpose the secondary
windings s, sand of the steadying device X are connected respectively to
the said circuits, and arranged as shown so as to give to each circuit the desired
E.M.F. each winding at the same time acting as a steadier in the manner
hereinbefore described. p is the primary winding of the said device.
Steadying or controlling devices of the kind herein before described may also be
used in connection with alternating current motors. In this case, in the examples
shown in the drawings, the alternator A, or transformers T would be replaced by an
alternate current motor, the arrangements in other respects being unaltered.
In each of the arrangements shown not only does the steadying device or devices
act to prevent or reduce pulsation of current, but also to prevent excessive currents
passing between the alternators, transformers or motors with which it or they is or
are used.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
1. For preventing or reducing pulsation of current in alternate current apparatus
such as alternators, transformers, and motors one or more steadying devices
comprising or each comprising one or more windings placed in the armature
or other circuit or circuits to be controlled and an iron core, whether or not another
winding arranged as a shunt on the mains or external circuit be used, the
arrangement being such as to act substantially in the manner hereinbefore
described with reference to the drawings annexed.
2. The several arrangements of steadying or controlling apparatus substantially
as hereinbefore described with reference to and shown in the drawings annexed for
the purposes set fouth.
Dated this 8th day of January 1895.
For the Applicant,
W. LLOYD WISE,
46, Lincoln's Inn Fields, London, W.C., Chartered Patent Agent.