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7 Oct. 22, 1946.
_ Filed July 7, 1-944
4 Sheets-Sheet 1
Maurie e ?feayaf?
andh/i‘lard Ii?er/I
Oct. 22,1946."
Filed Juiy 7, 1944
4 Sheets-Sheet 2
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Maurice fla’aja'n
and h/lYl/ara/ 1796/72
' Oct.‘ 22,1946.
Filed July 7, 1944
4 Sheets-Sheet a
To 1'na’rkaz‘f/ly
1 amps
é 4W
Oct. 22, 1946. ~
2,409,840 I‘
Filed July '7, 1944
’4 Sheets-Sheet 4
Patented 0a. 22, 1946
Willard A. Derr and Maurice E'. Reagan, Wilkins-v
burg, Pa., assignors to Westinghouse Electric
Corporation, East Pittsburgh, Pa., a corporation
of Pennsylvania
Application‘ July 7, 1944, Serial N0. 543,837
13 Claims. (Cl. 1'77—--353)v
Our invention relates,rgenerally, to control sys
terns and it has reference in particular‘to super
visory systems for supervisory control systems;
Generally‘stated, it is an object of our invention
by a‘ supervisory relay which isnormally. con
trolled by the ground detection relay and e?ects
operation of a supervisory point relay to cause a
fault code to be sent over the supervisory system.
False operations of the supervisory relay due to
operation of the impulse relays which connect the
channel to and disconnect it from the remote
and control station batteries, are ‘prevented by
to provide a supervisory‘ system for‘ detecting
faults on supervisory control systems, which is
simple and inexpensive to manufacture and is
easy to operate.
More speci?cally, it is an object of ‘our invention v means of an auxiliary supervisory relay which
to provide for detecting grounds and short or open 10 operates Whenever the supervisory control chan
circuits on a supervisory control channel, as well
nel is pulsing to remove the supervisory relay from
as grounds on other portions of the system, and ' the control of the ground detection relay.
low voltage on either the remote or control station
For a more. complete. understanding of the
battery, and to provide for indicating these condi
nature and the scope of our invention, reference
tions at the control station. 7
may be made to the following detailed description
It is also an important object of our invention
in connection with the accompanying drawings, in
to provide for normally maintaining supervision
of a supervisory control-channel by means of a
Figure 1 is a diagrammatic view of the indivi
relatively small supervision current when the
dual equipment and selecting relays at the control
channel is not in use, and for preventing false 20
indications of fault conditions while the channel
Fig.‘ 2 is a diagrammatic view of the common.
is being used for pulsing.
equipment at thecontrol station;
Another object of our invention is to provide for
Fig. 3 is a diagrammatic view of the individual
detecting and indicating grounds on the supervi
equipment. and selecting relays ‘at the remote
sory control channel or on the remote station bat
station; and
tery, and preventing changes in such indications
Fig. 4 is a diagrammatic view of the common
equipment at the remote station.
whenever the channel may be disconnected mo
mentarily from the remote station equipment dur
ing a pulsing operation.
The above-described figures are disposed to be
arranged in a similar manner to Figs. 1 through
Yet another object of our invention is to provide 30 4 of the Boswau Patent No. 2,091,301, which issued
for detecting and indicating grounds on both the
on August .31, 1937. -When thus arranged they
remote and control ‘station batteries and to pro
represent a supervisorylcontrol system which is
vide‘ for preventing a ground on the control‘ sta
basically the same as the system described in de
tion battery from being indicated by the‘ remote
tail in the BoswauPatent." For the purpose of
station equipment during a pulsing operation.
35 simpli?cation,‘ some of the, circuit conductors‘
Still another object of our invention is to pro
have been rearranged from the positions‘ shown‘
vide for indicating ground conditions on the sup
in the Boswau Patent, but the’ general arrange-i
ervisory control channel or the remote station bate
ment of the supervisory control equipment and‘ the
tery and preventing repeated reporting of the
manner of operation‘ thereof ‘remains substantially
ground condition owing to‘operations of the line 40 the same. Most ‘of the elements of the system of
control relays during pulsing operations.
A further object of, our invention is to provide
for detecting and indicating low battery voltage
conditions‘upon a relatively small change in the
voltage‘ thereof.
the present‘ application in‘ the same cooperative
relation as in the Boswau patent, and they‘bear
the same‘ reference characters as in the drawing
45 of the Boswau ‘Patent.
Other objects will in part be obvious, and will
in part, appear hereinafter.
the‘Boswau patent are shown‘in the drawings-of
In accordance with our invention, a recti?er de
vice having one terminal grounded is used to
operate a ground detection relay whenever the
battery or the supervisory control channel, or any
of the supervisory control circuits connected to
the battery or channel become grounded. Indi
cation of a ground condition at the remote station
or‘ on the supervisory control channel is eiiected
Certain relays of the
Boswau Patent have been modi?edjslightly and
other‘ relays have been added in order»? to perform
4' functions di?erent from those of the apparatus
of the Boswau Patent. Entirely new elements
have been designed by reference characters not
found in the Boswau Patentpwhereas other ele
ments which have been changed‘ only slightly have
been- designated by means of prime numbers cor
responding ‘to the designation-in the Boswau
Patent in order‘ to more readily identify them.
be provided which may be normally energized and
releasable upon operation of the line supervision
Referring particularly to Figs. 2 and 4 of the
drawings, it Will be seen that the line circuit or
supervisory control channel connections have
been changed from the series impulsing circuit
of the Boswau patent to provide instead a par
allel line impulsing circuit which is the type of
relay I2. Circuit means may be provided in con
nection with armatures 22, 23, 24 and 25 of the
restoration start relay 2M, selection coding start
relay 21E, relay 2H, and a supervisory alarm re
layv I21 of the- control station equipment, respec
circuit ridw mostgenerally usedsince it provides
tively, to provide holding 1 circuits for the auxil
iary supervisory relay 2|, which may be inter
connecting the operating coils of the line relays 10 .posed between the control relay [6 and the alarm
relay. is to prevent energization or deenergiza
268 and 400 of the control and remote stations
tion of the alarm relay due to operation of the
by means of a supervisory control channel com
a continuous circuit which may be used for re
mote metering, etc. In other words, instead of
impulse relays. Relays l6 and ill may be of the
prising the conductors H9 and .223 inseries cir- .
‘time delay type so as to insure the completion of
relays 20! and 4M, respectively, as in the Boswau 15 the auxiliary holding circuits should the line su
pervision relay l2 become deenergized due to op-.
patent, the line relays 2G0’ and 40%!’ are herein
cuit relation with contact members of the impulse
eration of .the impulse relays.
shown connected in parallel circuit relation. The
Supervision of the supervisory control channel
and thejiremote station equipment to detect and
impulse relays 2M’ and Alli’ which connect the 20 indicate grounds may be’ provided by means of
ground (detection apparatus shown .in Fig.3,and
supervisory control conductors 2L9 and 223 to the,
denoted generally by thenumeral 276.; For exam:
positive and negative terminals of the control and
ple, a ground relay 2'l_ may be provided in con‘-v
remote station batteries, respectively. Control of
the impulse relays 29!’ and dill’ may be effected ' junction with a suitable source of control poten
inexactly the same manner as described in de 25 tial'hsuch as the recti?er bridge circuit 128, for
line relays 200’ and 400’ are normally deener- '
gized, and may be energized by operation of the
connection between the positive terminalof the
tailqin the Boswau patentfor the impulse relays
remote station battery and ground. Means such
as the supervisory relay 30 may be ‘provided for
In order to maintain supervision of the super-,
visory control channel, means may be provided . normally operating under the control of the
for normally applying a line supervision poten 30 ground detection relay 2'! for energizing the point‘
relay 3H1, whichmay operatev in connection with
tial to the control channelconductors, having a
point 4 of the supervisory control system.
polarity opposite to that normally used during
Since operation of the impulse relays ‘2t!’ and,‘
pulsing operations.‘ For example, as shown in
dill’ connects the supervisory control channel to
Fig. 4, auxiliary means such as the control re
sistor Ii], which may be of a relatively high ohmic 3-5 and disconnects it from the control station and
remote station batteries, false indications of
value so as to normally prevent operation of the
ground conditions might result therefrom. For
line relays, may be provided for connecting the
example, in the case of a ground onv the control
conductor 223 to the positive terminal of the re
channel itself, operation of the impulse relay 401,’
motestation battery through armature 42?'and
back contacts, and the operating coil of the line 40 periodically disconnects the ground from the re‘
mote station equipment, causing periodical deen
relaydu?', while the, conductor Zlilmay be, con
ergization of the ground detection relay-27;- On
nected to the negative terminal through armature
the other hand, in the case of a groundron the
M9 of thelimpulse relay 49!.’ and a back contact
control station battery or equipment, operation of.
thereof to the negative terminal of theremote
and 4M“,
station battery.
Means such as the line super
the impulse relay 20L’ periodically connects the
‘ground to the remote station, equipment thus
vision relay I2 shown in Fig. 2 may be provided
at the control station end of the supervisory con
causing periodic operation of the ground detec
trol channel and disposed, to be normally ener
tion relay 21.
pervisory control channel his. at rest andin' a 50.
normal condition. Unidirectional current devices
[3, i4 and I5 may be provided in connection with.
the line supervision relay and the control chan
nel for making the line‘ supervisionrelay respon-v.
sive ‘only to the line supervisioncurrent.
For the purpose of preventing such false indiev
gized by the supervision potential when the su
, - .
cations, means such as the auxiliary supervisory
relay 32 may be provided. 'The auxiliaryjrelay
32 may be interposed between the ground detec-v
tion relay 2'! and the supervisory relay ally and
provided with energizing circuits in connection;
with armature 42! and back contacts and armae.1
c A control relay 16 may be provided for operat-.
" tures 33, 34‘and front contacts of the remote
ing under the control of the line supervision relay
l2 ‘in the event. it becomes deenergized to light a
pilot lamp 19 at the control station as shown in
Fig. l, which indicates to the dispatcherthat the
equipment is not normal._ Means such as the su
station, release relay 402, relay M8‘ and the re.
mote'station start relay 4H, respectively._ Relay,
‘ pervisoryor alarm relay [8 may be provided for,
30 may be normally energized through bacl; con
tactssof relay $2 vand front contacts of relay 2.7.
An auxiliary circuits'ma‘y be provided through,
front contacts of relay‘ 32.
normally operating in response‘to operation of
. Accordingly, if‘v the supervisory‘controlchan?
thelinesupervision relay I 2 to control the opera
nel Tis pulsing, the auxiliary supervisory relay 33
operates to prevent the release of the control
of the supervisory relay 39 and thus prevents
tion of an alarm I05 and a line supervision lamp
I] also shown in_Fig. l. A’reset relay‘ 20 may be
provided for operating-under the control of the , the point relay 3 [3 from being energized to trans-;
' re1ease;key Hi3 andinterrupting the operating
mit the ground signalc'ode. ' Relays Ziuand 3:2
may be of the slowv release type so as to insure
providing for proper operation.
In ‘order to prevent false indications vdue to
momentary deenergization of theline-supervision ’
Indication of low battery voltage at the remote,
circuit ofthe alarm bell.’
relay; [2 when the‘ impulse relay Mil’ at the re
station may be providedby means of‘ a voltage,
responsive relay 3! which controls a supervisory
mote station is energizedor when the impulse re
relay 35 to effect operation of the point relay
lay Zlllfat the control station is energized, means
such as the auxiliary supervisory relay 2| may} 75, 3M. By normally energizingthe voltage relay
3| through‘ aicontrol resistor 36~of ‘one. value“
andrprovidingfa reenergizing‘ circuit through an
originated l at the ‘remote
auxiliary control resistor of ,a.different. value.)
when‘ the voltage relay dropsdue to reduced volt.-v
age; the*'relay may be made to pickup when the: 5
batteryvoltagejncreases only a relativelyslighté
amount. The voltage. relay may thus .be:‘made
to indicate very slight ‘variations in the. battery:
voltage in order to report accurately. the. condi—‘
tion of the battery,
station; andthrough";.=~
either‘ armature 24 1of ‘relay 2 I‘! ‘or, armaturewzz‘é
of therestoration- start'lrelay- 2 I‘ tilt :‘the systems
is th‘roughlv regulanpulsing and-‘inthewresetllstage.E
Should- ashortlcircuitior an'open‘circuit occur-‘I
on» the supervisorywcontrollchannel, the?“ line- '
supervision relay- l2l'will b'e- deenergized-i'andiJan-l
obvious energizing ‘circuit-.- will!" be’ provided; for:
the“ control relayl i 6 ‘through ‘armature 62¢? and‘!
backlcontact ‘of the linealsupervision- lrelayl- I21} At-w
the same time the relay I2 interrupts the en‘era
Grounds‘ on, the control station‘ equipment may‘
beindicated' by means ofca‘groundv relay liciin
gizingcircuit for» the’ auxiliary “supervisory-relay
conjunction. with suitable source of direct-cure
2 I . Relay 16 operates to energize-the~pilot1lamp- \
rentipotentialsuch as the recti?er bridge circuit
i9 ‘through- armature “52 l and *fr’ont “contactsjl.
Ill which maybe connected between ground and 15 energizing circuit‘ is providedfor thealarm'relay'
the .negative terminal of the control station bat
is through the back contacts and arn1ature~53~
tery. In order to provide for preventing. the
of- supervisory control relay 2|. Thai-relay: IBM
ground. detection relay 40 ‘ from. indicating a
operates“ and" provides an energizinge circuit ifor' -
groundion the remote station equipment ‘when
impulsingris ‘being done from the controlstation; 20
control relaysl43 and 44 may be provided incon
junctionxwith a‘supervisoryrelay 45. The con-‘
trolrelay 44 may be of the pendulum. time delay
type ‘having. a vibrating; armature 45 which
periodically engages front contacts for a prede 251
the supervision ‘lamp 1‘! through:-armature-‘5d?
termined‘ time after it is deenergized so that when‘
the ground detection relay '46 operates and com
and an energizing circuit for the-alarm-bell F505‘?
through its armature 55 and armature-"5S v‘oftlfew
reset relay -2 D,
By operating the release key-H13, an energizing"
circuit is provided for'the resetrelayezlli‘wlriohil
locks in through its armature-3'!‘ and =front1con
tact, in multiple with the alarm'relay-‘lB through-*
13min‘ turn provides a circuit for energizing the
the armature 53 \of ‘thesupervisorypontrol irela-y'i
2i. The alarm bell? circuit is interrupted-bye
armature 56 of the reset relay.
supervisory relay'll? for apredetermined time.
The'relay G5, in turn, provides an energizing cir
visory control channel or“ the remote stat-ions
pletesla circuit for the‘control relay M, the relayv
Should a ground occur ‘ on either‘ the super
cuit for relay 43 LWhich remains in the energized
position for a relatively‘long time interval or
detection relay 2‘! picks upyinterruptingthe nor-“
from two to‘. approximately eight seconds, de
pending, upon the adjustment of the timedelay
' relay 30‘at armature ‘51' and back‘contacts.‘ Ree
relay M; and prevents operation of an alarm él;
The.time interval is su?iciently long that an
alarm 'is prevented. from being given, due to any
equipment while the system is at rest; th'eground
mal energizingcircuit‘ for the supervisory control‘
lay 39' drops after ‘a time interval and provides"
an energizing circuit 'for-the point control relay
3 14 through armature 58 and back contacts.‘ The“
condition whichmay occur during. impulsing,
supervisory control system then‘ operatesi‘in the"
since the time interval required for impulsing is,
much shorter than the time delay period‘of the
and select'point'll relay“ at the" control station:
relay '44;
usual manner to send out four control impulses"
The selection'is checked'inithe usual manner'and "
Low battery voltage at the control station may
relay I30 operates so that lamp I23 lights toin
be indicated by means of 'a voltage relay 48 and
dicate aground on the remote station equipment
an auxiliary relay 49, in conjunction with a, 4 1‘? or on the supervisory control channel.
control resistorill and an auxiliary control re- ‘
Should the impulse‘relay 40!’ ‘operate while a
sistorsli! in “a similar manner to that described
in connection with the voltage relay 34 ‘at the
remote station.
Under normal conditions with the system at
rest, the line supervision‘relay I 2 is energized
from 'the'remote station battery‘throughv a'cir
cuitwhich may be‘ traced :from: direct‘ positive
through armature 4200f the line relay 489’ and.‘
backcontact, control‘resistor i5, operating coil‘
of the .linerelay 409", conductor 223, operating
co-ilqof line relay 209’, recti?er device‘ ill, operat- ‘
ground exists on the supervisory control channel, .
the ground detection ‘relay 21 would be momene
‘tarily released owing to the disconnection‘of'the '
"remote station‘ from the channel. 'I‘h'e‘supere‘
visory relay‘ 30 is- prevented from‘ periodically"
picking up and releasing'the ‘point relay 3M‘ to
indicate removal of the fault, by providing-for
interrupting the energizing circuitof the super
7-visory relay 3!] through armature 59 and‘ back
contacts of the auxiliary‘supervisory relay 32.
The auxiliary supervisory relay‘32 is energized
ing coil of line supervision relay i2,‘ back contact
each time the channel pulses through the arma
and armature 42 of impulse relay 2G2’, conductor
tures of one or another of the relays 402, 411 and
‘M9,. armature elguand lback'contact of impulse 601
Accordingly, the energizing circuit of the
relay. 4M’.
supervisory relay 3!] will be broken by the aux
Should either of the impulse relays operate
iliary supervisory relay 32 each time the channel‘
such as during a pulsing operation, the line super
is disconnected from the remote station equip
vision relay [2 will be momentarily deenergized.
ment, thus preventing the supervisory relay 30'
Operation of the impulse relays 2M’ and '40!’
:_from picking up and giving a false indication.
momentarily drops the line supervision relay,
In the event that a ground occurs on the con
causing .the control relay iii to pick up. The
trolistation battery or equipment, a false indica
auxiliary‘ supervisory relay 2i is not dropped
tion thereof by the remote station is likewise pr however, since an auxiliary holdingK circuit therevented whenever the impulse relay 20!’ connects
for. is provided from negative through the op 70 “ the supervisory control channel to the control
erating coil ofrelay 2!, armature 6i) and front
station equipment; The auxiliary supervisory
contacts, conductor 6!, and through armature
relay 32 is energized through one or another of
23 :or selection start relay ZIG if the pulsing was
the armatures, 34 of the substation start relay
started from the ‘control station‘; through arma
4", 33 of the relay 4l8'or‘42l of the-release relay‘
ture 125“. ofw' the» alarm ‘ ‘ relay- I21‘!- if < thee pulsing»
v5402; depending‘onwhet-her the pulsing originates “
tions operable .over a single supervisory and con
trol channel therebetween comprising, means
whether it is in the reset stage at the end of a
pulsing operation. A holding circuit is thereby
at one of the stations including a ground relay
provided for the supervisory relay 30 through ar
and a source of operating potential connected
mature 59 and front contacts of, relay 32, and 5 between ground and one terminal of the battery
armature 58 and front contacts of relay 30 which
at said station to be responsive to a ground fault
remains in the energizing position for a predeter
condition on the supervisory control equipment
mined time even though its energizing circuit
at said one station and the channel and associ
at the remote station, the control station, ‘or
was momentarily interrupted by armature 59
moving from the back contacts to the front con
ated circuits, supervisory means controlled by
10 said means operable to indicate the fault condi
tion at the control station, and circuit means
including relay means controlled in accordance
with operations of the impulse relays from either
of the stations to prevent operation of the im
In the case that a ground occurs during a puls
ing operation, the release of supervisory relay 30
does not take place until the auxiliary supervisory
relay 32 releases after the impulsing is over. 15 pulse relays from a?ecting the fault-responsive
When relay 3!] once releases, it cannot be picked
up again until both relays 32 and 21 are released.
Relay 32 seals in through front contacts of
ground detection relay 21, its own front contacts,
and a back contact of supervisory relay 30. Re
lay 32 is thus prevented from releasing due to the
means when a ground fault occurs on the
3. For use in a supervisory control system
having supervisory and control equipment includ
20 ing a line relay at each of a remote and a con
trol station operably connected in parallel cir-,
release of relay 2'! during pulsing. The super
cuit relation by a single supervisory control line
visory relay 30 is, therefore, prevented from be
disposed to be selectively connected to sources
ing energized again until ground detection relay
of the same polarity at each of the stations by
2'! drops out for a long enough time to indicate 25 impulsing relays, means responsive to‘ a fault
that the ground no longer exists. Repeated re
condition of the line or equipment including a
porting of the ground is thus prevented, and the
supervision relay at the control station and uni
visual indication at the control station is held
directional current means at the control and. re
until the ground is removed.
From the above description and the accom
panying drawings, it will be apparent that we
have provided, in a simple and effective manner,
for providing complete supervision of the station
equipment and supervisory ‘channel against
mote stations connected to provide a series cir
30 cuit with the line relays over the control line
only for a supervision potential of an opposite
polarity, supervisory means normally responsive
to operation of the fault-responsive means, and
means including control means operable in ac-‘
grounds, and have. provided for accurately indi 35 cordance with the operating condition of the
cating the relative location of such ground. In
addition, provision has been made for maintain
supervisory control line to prevent connection of
the line to and disconnection thereof from the
ing continuous supervision of the supervisory
supervisory and control equipment during oper
control channel against short or open circuits
ation of the line relays from affecting operation
without any interference by reason of impulsing 40 of the supervisory means.
operations over the channel. Separate indica
4. For use with a supervisory control system
tions are also provided of low battery conditions’
having supervisory control equipment at remote
at the remote and control stations.
and control stations controllable over a super
Since certain changes may be made in the con
visory control channel which is normally con
struction of the above-described apparatus and 45 nected to a source at one of the stations by
different embodiments of the invention may be
impulse relays, means including a recti?er bridge
made without departing from the spirit and scope
circuit connected between ground. and the posi
thereof, it is intended that all the matter con
tive terminal of the source to which the channel
tained in the above description and shown in the
is normally connected and a ground relay re
accompanying drawings shall be considered as 50 sponsive to a ground condition on the super
illustrative and not in a limiting sense.
visory control channel or the equipment associ
We claim as our invention:
ated with said one source, supervisory means
1. In a'supervisory control system having re
normally responsive to operation of the ground
mote and control stations with a single super
responsive means to provide indication of a
visory and control channel extending therebe 55 ground on said equipment or the channel, and
tween and supervisory and control equipment at
circuit means including control means responsive
each station including normally deenergized
to predetermined operations of the supervisory
supervisory control relays for controlling the . control equipment for preventing changes in the
energization of the supervisory and control chan
connections between the supervisory control
nel, control means responsive to‘ a faulty condi ,60 channel and the said- equipment from affecting
tion of the channel or an associated circuit, cir
cuit means including a back contact ‘of a ‘nor
mally deenergized supervisor control relay nor- 7
the operation .of the supervisory means when a
ground occurs on the channel.
5. For use in a supervisory control vsystem
mally connecting the channel to 'a source at
having remote and control stations connected by
the remote station, means responsive ‘to oper 65 a supervisory control channel connecting line
ation of the control means for indicating the
relays at the stations in parallel relation and
faulty condition at the control station,’ and
controlled by supervisory, control equipment ine
means responsive to energization and deenergi
eluding normally deenergized supervisory con
zation of the supervisory and control channel
trol relays at each station, means for normally
for preventing false indications due to operation 70 applying a supervisory potential to the super-.
of the supervisory control relays.
2. A ground detection system for a supervisory
visory control channel
through contacts of a
supervisory control relay,
trol station connected to
at a remote station
normally deenergized
and means at the con
the channel by a nor
control system having supervision and control
apparatus including an impulse relay and a sta
tion battery ateach of remote and control sta 75 mally deenergized supervisory control relay‘ to be
r l
controlled byrfsaid potential for‘ operationain
response to a fault condition on'lthechannel.‘
$16.".F0r‘ usein supervising the supervisory‘and
control channel iconnecting supervisory “:control
equipment including normally de'energized line :
:relays at remote‘ and‘ control ‘stations, 'means
normally vconnecting ‘the’ channel to a source ‘at
the remote station/for supplyinga supervision
potentia'lto the channel without operating the
line relays‘when the system is at rest which'is i
opposite m‘- polarity to. the operating‘ potential
of the ‘channel, supervisory meansoperable in
response to the supervision potential to indicate
means associatedlwith the remote station impulse
‘relay ‘for energizing the channel'with an opposite
polarity. when‘ the-channel is‘ not in operation,
supervisory‘means including av relay associated
with the channel. and operable ‘only in‘ response
to ‘said opposite polarity, a time delay relay. oper
able in response to release of the supervisory -
means, a normally energized auxiliary time delay
‘relay controllediby said time delay relay, signal
means fnormally operable when the auxiliary
time delay relay‘ releases, and circuit means as
sociated with one of the‘ supervisory control re
lays for providing aiholding circuit for the aux
an open circuit or short‘cir‘cuit on the ‘channel,
iliary time
supervision means including a ground ‘relay con 5:15 operates.
nected between the source and ground operable
to indicate a ground on the remote station equip
ment or channel, and means eiiective ‘to prevent
operation of the supervisory control equipment
from affecting operation of the ground relay to
indicate a faulty channel condition while the
channel is operating. .
7. In a supervision system‘for a supervisory
delay relay when the'impulse relay
‘ 10. A ground detection system for ajsuper-Q
visory control system having supervisory-control
‘equipment with separate .source‘srat remote and
control stations connected by a single supervisory
control channel under the control of impulse re
lays at each ofthe stations comprising, ground
detection means connected to the source of the
remote station operable in response to a ground
control system having a supervisory control
condition, supervisory means normally controlled
channel connecting the equipment at remote and 25 by the ground detection means for providing an
control stations disposed to be energized with a
predetermined polarity during operation by im
pulse relays at the remote and control stations,
channel supervision means, unidirectional current
means connected between the channel super
vision means and the channel for preventing op
eration thereof only on a polarity opposite to
the operating polarity, means associated with
the remote station for applying a supervision
indication at the control station of a ground
condition, and means associated with the super
visory means for preventing the ground detec
tion means from effecting operation of the super
visory means in response to a ground condition
at the other station while the channel operatively
connects the equipment at both stations.
11. A ground detection system for a super
visory control system having supervisory control
potential to the channel opposite in polarity to 35 equipment at remote and control stations with
the operating potential of the channel when the
a plurality of points and a Supervisory control
channel is not in operation, auxiliary means un
channel connecting normally deenergized line
der the control of the channel supervision means
relays controlled by impulse relays for connecting
for indicating a loss of supervision potential at
the control station, and means including relay
means operable when the channel is operating
to prevent the auxiliary means from indicating
the channel to control sources at each station
for predetermined intervals during operation
comprising circuit means connecting the chan
nel to the source at the remote station when the
a loss of potential when the channel is operating.
impulse relays are deenergized, a ground detec
8. In a supervision system for a supervisory
tion relay, circuit means including a recti?er
and control channel connecting supervisory and 45 device for providing a unidirectional ground de
control equipment at remote and control stations
tection potential connecting the ground detec
including supervisory control relays at the con_
tion relay between the remote station source
trol station operable under different conditions
and ground, time delay supervisory means oper
of channel operation and impulse relays at the
able under the control of the ground detection
remote and control stations operable to connect 50 relay to send a fault code signal from a pre
‘the channel to a source of one polarity, a line
supervision relay, circuit means including a uni
determined point, and an auxiliary time delay
relay operable during connection of the chan
nel to the control sources to prevent any change
directional current device connecting the line
supervision relay to the supervisory control
in the condition of the supervisory means.
channel, means associated with the remote sta 55 12. In a supervisory system for a supervisory
tion line control relay for applying a supervision
control system having supervisory control equip
potential to the channel when the channel is
ment including line relays at remote and control
not in operation for operating the line super;
stations with sources of control voltage at each
vision relay, indicating means normally respon
station and a supervisory control channel ex
sive to operation of the line supervision relay to 60 tending between the stations connecting the line
the inoperative position .to indicate a faulty chan
relays in parallel relation and disposed to be ‘
nel condition, and control means controlling
connected to the sources by impulse relays for
operation of the indicating means, said control
providing one polarity while operating and the
means being responsive to operation of one of
opposite when not operating, a point relay at
the supervisory control relays to prevent oper 65 the remote station operable to provide a prede
ation of the indicating means during operation
termined signal code for indicating at the con
of the supervisory control channel.
trol station, means including a separate source
9. In a supervision system for a supervisory
control channel connecting supervisory control
equipment at remote and control stations includ
ing impulse relays operable to energize the chan
and a ground relay responsive to a ground con_
dition on the channel or at the remote station
70 for normally effecting operation of the point
relay to signal said condition, normally ener
nel with a predetermined polarity and a plurality
gized relay means operable after a time delay
of supervisory control relays operable to effect
to the deenergized position to e?ect operation of
operation of the impulse relays in selecting,
the point relay, normally-deenergized relay
checking operating and supervisory operations, 75 means responsive to operation of the ground re
v12 ‘
1ay normally operable to effect operation of the
normally energized relay means, and control
means operable in accordance with the operating
condition of the channel for e?ecting energization
of the normally ‘deenergized relay means while
the channel is operating to transmit a‘ code
13. In a supervisory system for a supervisory
nel to prevent operation of the line relays from '
affecting the operating condition of the super
visory means, line supervision means including
a line supervision relay connected to the channel
by the control station line-control relay in the’
inoperative condition, means associated with the
remote station impulse relayfor applying a super
vision potential to the channel when said im
‘control system having supervisory control equip
pulse relay is in the inoperative position for
tion, supervisory‘means normally responsive to
operation of the ground‘ responsive means for
channel for preventing operation'of the‘ impulse
relays from affecting the operating position of
e?ecting operation of the remote station im
pulserelay to signal a fault condition, control
means at the remote station operable in accord 20
ance with the operating condition of the chan
the supervisory means.
ment with associated sources of control voltage 10 effecting operation of the line supervision-relay,
supervisory means at the control'station operable
at remote and control stations and a supervisory
under the control of the line supervision relay
control channel extending therebetween disposed
for indicating a short’ or open circuit condition
to be connected to said ‘sources by impulse relays
of the channel, and control means operable. in
under the control of said equipment, means at
the remote station responsive to a, ground condi 15 accordance with the operating conditionof the
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