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Publication
_________________________________________________________________
Number GB401010A
i»?
Title
_________________________________________________________________
EN Title Improvements
potential transformers
relating
to
the compensation of three-phase
Abstract
_________________________________________________________________
13356.
[Class 38 (ii).] In order to bring the secondary voltages of
three-phase potential transformers into phase coincidence with the
primary voltages, there is added to the secondary winding on the
centre limb 2 of the core a half turn through the window between the
limbs 1 and 2 so as to be effectively excited by the flux threading
the limb 1, and a complete turn is added to the winding on the limb 3.
Thus there is added to the secondary voltages oa, ob, oc produced by a
normal winding arrangement the voltages b b <1> , c c <1> producing
line voltages a b <1> , b <1> c <1> , c <1> a which bear correct
relation to the primary phase voltages OA, OB, OC.
Description
_________________________________________________________________
PATENT SPECIFICATION
Application Date:
April 27, 1933.
May
9,
1932.
No. 13,356/32. 4:01 Complete Left:
Complete Accepted: Nov. 9, 1933.
PRO-VISIONAL
SP-ECIFlUIATION,
Improvements
relating
Compensation of Three-phase Potential Transformers.
to
the
We, TiE BnITIsH TiOMsoN-HlousToN COMPANY, LIMITED, a British company
having its registered office at Crown louse, Aldlwych, London,
W[[C]]2, and CHARLES GILBERT MAYO, of 17, Alexandra Road, Rugby, in
the County of Warwick, a British suoject, do hereby declare the nature
of this invention to be as follows:In Patent No. 263,967, granted to
one of the present Applicants and another, there is described a method
of phase angle compensation for potential transformers. According to
this method, in a three-phase potential transformer, each secondary
phase winding is connected in series with an auxiliary winding on one
of the other phases commonly known as a " teaser " winding. The
vectorial sum of the voltages thus obtained may be arranged to lag by
any desired angle behind which it would otherwise have in the absence
of the auxiliary turns by a suitable choice of turns of the " teaser"
winding.
The object of the present invention is to provide a simplified
arrangement
of the kind set forth in the above specification
applicable to 3-phase potential transformers having their windings
located on a three-limbed core, and to this end the invention consists
in providing phase angle compensation, without the use of auxiliary
windings involving connections between phases.
In a three-limbed core, the flux linking a turn through one core
window corresponds to that in the outer adjacent leg.
If, then, the low tension winding finishes on the opposite side of the
core to that of its start (equivalent to normal winding plus a turn
through one core window only) there will be induced in the winding, in
addition to the normal voltage, a voltage corresponding to one turn
round the corresponding outer leg in the inverse sense. This phase
(the middle phase) will thus be as if connected to a single turn "
teaser " winding as described in Patent Specification NSo.
263,967
before.
mentioned
above.
The
remaining
phase
voltages will be as
If line voltages now be considered, it will be found that if the
additional turn has been provided in the window adjacent the phase
leading the middle phase, two of the line voltages involving the
centre phase have been phase angle corrected, although to a different
extent, while the third or lagging line voltage remains unchanged.
Moreover, the absolute magnitudes of the line voltages are unequal.
It will, however, be found that if the voltage of the phase lagging
the centre phase is increased a suitable amount by turn correction,
then not only are the three line voltages made numerically equal, but
also each line voltage is phase angle compensated to an extent
obtainable by phase angle compensation by teaser ' windings of 3 turn
in accordance with Patent No. 263,967.
The invention is accordingly carried into effect by providing on one
limb of a three-Limbed core carrying the three secondary windings of a
potential transformer an additional half winding turn which is
effectively excited only by leading flux present in an adjacent limb,
the current in the said half-turn being utilised to effect phase angle
compensation to the current flowing in the phase winding on that limb,
compensation of the currents flowing in the other phases being
obtained by the provision of additional correctional turns on the
phase winding located on the third limb of the core.
Dated this 9th day of May, 1932.
JOIN GRAY,
Applicants.
Crown
House,
Aldwych,
London,
W[[C]]Z,
Agent for the
COMPLETE SPECIFICATION.
Improvements
relating
to
the Compensation of Three-phase, Potential
Translormers.
We, THE BiRITISH THOMSON-EOUSTON having its registered office at Grown
90 COMPANY, LIMITED, a British company House, Aldwych, London,
W[[C]]2, [.Pi-e l/-] 1010 70, -- - 1 J1 and CHARLES GILBERT MAYO, Of
17, Alexandra Road, Rugby,. in the County of Warwick, a British
sithject, do hereby declare the nature of this invention and in what
manner the same is to be pjerformed, to be particularly described and
ascertained in and by the following state ment:This invention relates
to thr-ee-phase electric transformers having star-connected secondaiy
Windings. more particularly it relates to potential transformers of
this type and provides a means of givinig phase-angle correction to
the sedondary voltages.
Accordilig to the invention, in a threephase electric transformer with
star-connected secondary windings, wve provide an extra half-turn on
the secondary winding of one phase, effectively excited only by the
flux of another phase, and we provide an extra turn on the secondary
winding of the third phase.
The arrangement according to the invention gives a phase displacement
to the secondary voltages. By naking this displacement in the correct
sense and by choosing the total number of secondary turns to obtain
the correct angle of displacement, we can cofrect the phase angle
error of a potential transformer.
In the accompanying drawings, Fig.
1 represents a three-phase potential transformer, and Fig. 2 is a
vector diagram of the primary and secondary voltages therein.
In Fig. 1, a three-limbed core is shown, having legs 1, 2 and 3, which
carry the windings of the phases A, B and C, respectively. The primary
windings have the same number of turns on each limb, and are not
shown. The primary voltages are represented by OA, OB, OC in the
vector diagram, Fig. 2.
With equal secondary turns on each limb, the secondary voltages would
appear oa, ob, oc in the vector diagram, leading by a small angle on
the primary voltages. However, the secondary windDO ingR3 4-, 5, 6
have not equal numbers of turns. Winding 5 on- the centre limb, phase
B, is given an extra half-turn through the window between limbs 1 and
2, and winding 6 on limb 3 is given one extra turn. The extra
half-turn on winding 5 links the flux in limb 1, so an additional
voltage bbl is induced, equivalent t one turn in magnitude, in phase
with oa but in oppoaife sense. The extra turn 0 on winding 6 links the
same flux as the rest of this winding, so an additional voltage ccl is
induced, in phase with 6c.
Thus by star-connecting the secondaries, the output line voltages ab',
ball, cia are ooutained. By suitaDly proportioning the 65 secondary
windings to the single-turn 6orrections obtained, it is possible to
correct these line voltages into phase coincidence with the primary
line voltages AB, BC, CA, or into a desired phase displacement
therefrom.
:Having now particularly described and ascertaine6d the nature of our
said invention and in hat manner the same is to be performed, we
declare that what we 75
Claims
_________________________________________________________________
claim is:1. A three-phase electric transformer with star-connected secondary
windings, having an extra half-turn on the secondary winding of one
phase, effectively go excited only by the flux of another phase, and
having an extra turn on the secondary winding of the third phase.
2. A method of giving a phase displacement to the secondary voltages
of
85 a three-phase electric transformer having star-connected
secondary windings, consisting in the addition of a half-turn to the
winding on the centre limb, through the window; between the centre
limb SO and one outside limb, and the addition of a single turn to the
winding on the other outside limb.
3.
In a three-phase electric transformer having star-connected
secondary 95 windings, a method of correcting the secondary voltages
into phase coincidence with the primary voltages, consisting in the
addition of a half-turn to the secondary winding on the centre limb,
through. the window between the cenire limb and 100 that outside limb
which carries the phase leading that carried by the centre limb, and
the addition of a single turn to the secondary winding on that outside
limb i) which carries the phase lagging that car- ins ried by the
centre limb and proportioning the secondary windings to obtain the
correction required.
4. A three-phase electric transformer. with star-connected secondary
windings having a whole number of turns on one outside limb, one
half-turn more on the centre limnb, through the window between the
centre limb and this outside limb, and a whole turn more on the other
outside Ll5 limb than on this outside limb.
5. An electric transformer substantially as described with reference
to the accompanying drawings. Dated this 25th day of April, 1933. 120
JOHN GRAY, Crown House, Aldwych, London, W[[C]]2, Agent for the
Applicants. Redhill: Printed for His Majesty's Stationery Office, by
Love and Malcomson, Ltd.-1933. 401,010)
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