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010 - Application Chart of Westinghouse Relays · Silent Sentinels- Protective Relays for A-C and D-C Systems

• 0:01
  Speaker 1: Chapter eight of Silent Sentinels by Westinghouse Electric and Manufacturing Company.
• 0:11
  Speaker 1: This LibriVox recording is in the public domain. Application chart
• 0:19
  Speaker 1: for Westinghouse Protective and Control relays General applications. Application to
• 0:28
  Speaker 1: give signal at over or under AC voltage type C
• 0:35
  Speaker 1: V rating contacts normally closed above fifty five voltes ninety volts,
• 0:42
  Speaker 1: one hundred and forty votes or two hundred and eighty volts.
• 0:46
  Speaker 1: Contacts normally closed below eighty volts or one hundred and
• 0:52
  Speaker 1: sixty volts. Time characteristics inverse operating principal induction description AC
• 1:01
  Speaker 1: over and under voltage. Application to disconnect AC apparatus upon
• 1:10
  Speaker 1: overcurrent type C rating four to twelve amps four to
• 1:17
  Speaker 1: sixteen amps. Time characteristics inverse with definite minimum operating principle
• 1:26
  Speaker 1: induction description AC overcurrent fold amps required to operate sixteen.
• 1:35
  Speaker 1: Application to disconnect AC apparatus upon overcurrent type CoA rating
• 1:45
  Speaker 1: four to twelve amps. Time characteristics inverse with definite minimum
• 1:52
  Speaker 1: operating principle induction description type C with current indias cater
• 2:00
  Speaker 1: fold amps required to operate sixteen. Application to disconnect AC
• 2:09
  Speaker 1: apparatus upon overcurrent applicable where only low ratio bushing. Type
• 2:16
  Speaker 1: current transformers are available. Type l ECO rating four to
• 2:24
  Speaker 1: twelve amps. Time characteristics inverse with definite minimum. Operating principle
• 2:32
  Speaker 1: induction description AC overcurrent volt amps required to operate two
• 2:41
  Speaker 1: Application to protect AC installation against excessive powerflow in reverse
• 2:51
  Speaker 1: direction normal voltage. Applicable on regenerative systems. Type C W
• 3:00
  Speaker 1: rating five amp seventeen one hundred and twenty five volts
• 3:05
  Speaker 1: fifty to three hundred watts one hundred to six hundred watts.
• 3:11
  Speaker 1: Time characteristics inverse operating principle induction description AC reverse power
• 3:21
  Speaker 1: application to protect windings of AAC apparatus from overheating. Applicable
• 3:29
  Speaker 1: where exploring coils may be installed in windings. Operates only
• 3:35
  Speaker 1: on excess current and temperature. Type c T rating five amps.
• 3:43
  Speaker 1: Time characteristics inverse operating principle induction description AC over temperature
• 3:53
  Speaker 1: application to protect windings of apparatus from overheating. Oil Feld
• 4:00
  Speaker 1: thermal relay operating from current transformer short time type BA
• 4:08
  Speaker 1: rating two to fifteen amps. Time characteristics ten seconds to
• 4:15
  Speaker 1: ninety minutes. Operating principle differential expansion description AC thermal bolt
• 4:24
  Speaker 1: amps required to operate. Sixteen to fifty two volt amps
• 4:29
  Speaker 1: at five amps. Application to protect windings of apparatus from overheating.
• 4:37
  Speaker 1: Oil felled thermal relay operating from current transformer. Long time
• 4:44
  Speaker 1: type BA rating two to fifteen amps. Time characteristics ten
• 4:51
  Speaker 1: seconds to one hundred and twenty minutes. Operating principle differential
• 4:57
  Speaker 1: expansion description AC D thermal fold amps required to operate
• 5:04
  Speaker 1: sixteen to fifty two fold amps at five amps. Application
• 5:09
  Speaker 1: to protect windings of apparatus from overheating. Oil felled thermal
• 5:16
  Speaker 1: relay operating from current transformer, long time type BF rating
• 5:23
  Speaker 1: one to sixty amps. Time characteristics inverse operating principal differential
• 5:31
  Speaker 1: expansion description AC or DC thermal application to protect windings
• 5:40
  Speaker 1: of apparatus from overheating. Cartridge type thermal relay type b
• 5:47
  Speaker 1: K rating sixty two one hundred amps. Time characteristics inverse
• 5:54
  Speaker 1: operating principal differential expansion description AC Z or DC thermal
• 6:02
  Speaker 1: application to protect windings of apparatus from overheating. Cartridge type
• 6:08
  Speaker 1: thermal relay hand reset type b H rating one to
• 6:16
  Speaker 1: one hundred amps. Time characteristics, inverse operating principle differential expansion
• 6:25
  Speaker 1: description AC or DC thermal application to protect windings of
• 6:34
  Speaker 1: DC apparatus from overheating. Applicable where exploring coils may be provided.
• 6:41
  Speaker 1: Type DT rating special time characteristics inverse operating principle moving
• 6:51
  Speaker 1: coil description DC over temperature application, oil filled thermal relay
• 6:59
  Speaker 1: operating from bus, current shunt or interpol drop. Short time
• 7:04
  Speaker 1: type BD rating two to fifteen AMS, time characteristics ten
• 7:11
  Speaker 1: seconds to ninety minutes. Operating principle. Differential expansion description DC
• 7:19
  Speaker 1: over temperature application, oil filled thermal relay operating from bus,
• 7:26
  Speaker 1: current shunt or interpol drop. Long time type BD rating
• 7:32
  Speaker 1: two to fifteen AMS, time characteristics ten seconds to one
• 7:38
  Speaker 1: hundred and twenty minutes. Operating principle differential expansion description DC
• 7:46
  Speaker 1: over temperature application to protect bearings of rotating machines from overheating.
• 7:54
  Speaker 1: Type HM rating one hundred degrees celsius operating principle. Volatile
• 8:02
  Speaker 1: liquid description over temperature application to protect resistant scrids from overload.
• 8:10
  Speaker 1: Auto substation control type h N rating one hundred and
• 8:17
  Speaker 1: fifty degrees celsius, three hundred degrees celsius operating principle. Volatile
• 8:24
  Speaker 1: liquid description over temperature application type generators application to protect
• 8:34
  Speaker 1: against excessively high voltage upon sudden clearance. Of short circuit
• 8:40
  Speaker 1: used with vibrating type voltage regulator type c V rating
• 8:47
  Speaker 1: contacts normally closed above fifty five volts. Time characteristics. Inverse
• 8:55
  Speaker 1: operating principle induction description rates on under voltage. Application to
• 9:04
  Speaker 1: disconnect AC generator in case of fault in winding differential
• 9:11
  Speaker 1: protection type CA rating five amps. Time characteristics. Instantaneous operating
• 9:21
  Speaker 1: principle induction description AC current application to disconnect AC generator
• 9:31
  Speaker 1: in case of fault in winding differential protection type l
• 9:37
  Speaker 1: E C rating zero point five to two point five amps.
• 9:44
  Speaker 1: Time characteristics inverse with definite minimum operating principle induction description
• 9:53
  Speaker 1: AC current fault amps required to operate two applic to
• 10:01
  Speaker 1: limit the power fed into system by generators in small substations,
• 10:07
  Speaker 1: type c W rating five amps, seventy and one hundred
• 10:13
  Speaker 1: and twenty five volts fifty to three hundred watts one
• 10:18
  Speaker 1: hundred to six hundred watts time characteristics. Inverse operating principle
• 10:25
  Speaker 1: induction description AC overpower application to protect three wirre DC
• 10:35
  Speaker 1: generator against excessive unbalanced current, type T rating forty to
• 10:43
  Speaker 1: eighty millivolts. Time characteristics. Instantaneous operating principle armature description DC
• 10:54
  Speaker 1: overcurrent application type converters. Application to prevent starting of SIN
• 11:02
  Speaker 1: converter on low voltage automatic substation. Type c V rating,
• 11:10
  Speaker 1: special time characteristics inverse operating principle induction description AC over
• 11:20
  Speaker 1: or under voltage. Application to prevent operation on single phase
• 11:26
  Speaker 1: or on badly unbalanced phases. Type CM rating two to
• 11:32
  Speaker 1: six amps. Time characteristics inverse with definite minimum operating principle
• 11:40
  Speaker 1: induction description balanced phase current type c Q rating two
• 11:48
  Speaker 1: to six amps, sixty cycle time characteristics inverse with definite
• 11:54
  Speaker 1: minimum operating principle induction description balance phase current volt amps
• 12:03
  Speaker 1: required to operate twenty Application to prevent converters from running
• 12:11
  Speaker 1: inverted reverse DC current type D rating fifty millivolts time characteristics,
• 12:21
  Speaker 1: inverse operating principle moving coil description d C reverse current
• 12:31
  Speaker 1: application to disconnect converter when flashover occurs. Type MF rating
• 12:39
  Speaker 1: one hundred amps, DC time characteristics, instantaneous operating principle armature
• 12:49
  Speaker 1: description d C overcurrent flash relay application type motors, application
• 12:59
  Speaker 1: to disconnect with AC motors upon fault in voltage. Type
• 13:04
  Speaker 1: CV rating contexts normally closed above fifty five volts, ninety votes,
• 13:12
  Speaker 1: one hundred and forty voltes two hundred and eighty volts.
• 13:16
  Speaker 1: Time characteristic inverse operating principle induction description AC under voltage
• 13:25
  Speaker 1: application to disconnect AC motors in case of fault in Windings.
• 13:31
  Speaker 1: Differential protection type CA rating five amps. Time characteristics instantaneous
• 13:42
  Speaker 1: operating principle induction description AC current application to disconnect AC
• 13:52
  Speaker 1: motors in case of fault in Windings. Differential protection type
• 13:58
  Speaker 1: l ECO rating zero point five to two point five amps.
• 14:05
  Speaker 1: Time characteristics inverse with definite minimum operating principle induction description
• 14:15
  Speaker 1: AC overcurrent volt amps required to operate two. Application to
• 14:23
  Speaker 1: prevent AC motors from drawing excess power from line. Normal
• 14:30
  Speaker 1: voltage type c W rating five amps, seventy to one
• 14:37
  Speaker 1: hundred and twenty five volts fifty to two hundred watts
• 14:41
  Speaker 1: one hundred to six hundred watts. Time characteristics. Inverse operating
• 14:48
  Speaker 1: principal induction description AC reverse power application to prevent AC
• 14:58
  Speaker 1: motor from reach turning over power to line when it
• 15:03
  Speaker 1: is being run by a load. Type c W rating
• 15:09
  Speaker 1: five amps, seventy to one hundred and twenty five volts
• 15:14
  Speaker 1: fifty to three hundred watts, one hundred to six hundred
• 15:19
  Speaker 1: watts time characteristics inverse operating principle induction description. AC overpower
• 15:33
  Speaker 1: application to prevent polyphase AC motors from operating single phase
• 15:40
  Speaker 1: or with badly unbalanced phases. Type c M rating two
• 15:46
  Speaker 1: to six amps. Time characteristics inverse with definite minimum operating
• 15:53
  Speaker 1: principle induction description. Phase current balance or phase failure. Application
• 16:01
  Speaker 1: to prevent poly phase AC motors from operating single phase,
• 16:06
  Speaker 1: reverse phase, or with badly unbalanced phases. Type c Q
• 16:13
  Speaker 1: rating two to six amps. Time characteristics inverse with definite
• 16:19
  Speaker 1: minimum operating principle induction description phase current balance or phase
• 16:26
  Speaker 1: failure foolt amps required to operate twenty Application to prevent
• 16:34
  Speaker 1: starting poly phase induction motors, single phase or with reversed phase.
• 16:41
  Speaker 1: Type c P rating one hundred and ten or two
• 16:47
  Speaker 1: hundred and twenty volts. Time characteristics inverse operating principle induction description.
• 16:56
  Speaker 1: Reverse phase application to disconnect polyphase motors upon phase reversal
• 17:05
  Speaker 1: type CP rating one hundred and ten or two hundred
• 17:10
  Speaker 1: and twenty volts. Time characteristics inverse operating principle induction description.
• 17:20
  Speaker 1: Reverse phase application transformers application to disconnect transformers upon over current.
• 17:31
  Speaker 1: Applicable where only low ratio bushing type current transformers are available.
• 17:38
  Speaker 1: Type L E co O rating four to twelve amps.
• 17:43
  Speaker 1: Time characteristics inverse with definite minimum operating principle induction description
• 17:52
  Speaker 1: AC over current bold amps required to operate. Two Application
• 18:00
  Speaker 1: to disconnect high voltage transformers upon overcurrent, applicable on circuits
• 18:06
  Speaker 1: carrying approximately less than one hundred amps. Type C B
• 18:13
  Speaker 1: rating four to twelve amps. Time characteristics inverse with definite
• 18:20
  Speaker 1: minimum operating principle induction description AC overcurrent vault amps required
• 18:29
  Speaker 1: to operate. Forty four Application to disconnect transformers in case
• 18:36
  Speaker 1: of vault in winding differential protection type CA rating five
• 18:44
  Speaker 1: to ten amps. Time characteristics instantaneous operating principle induction description
• 18:54
  Speaker 1: AC current. Application to disconnect transformers in case of fault
• 19:01
  Speaker 1: in winding differential protection type CO rating four to twelve amps.
• 19:09
  Speaker 1: Time characteristics inverse with definite minimum operating principle induction description
• 19:18
  Speaker 1: AC overcurrent bolt amps required to operate. Sixteen Application to
• 19:27
  Speaker 1: protect windings from overheating thermostat type h M rating one
• 19:35
  Speaker 1: hundred degrees celsius operating principle. Volatile liquid description over temperature
• 19:43
  Speaker 1: application to protect windings from overheating. Exploring coil type CT
• 19:52
  Speaker 1: rating five amps, operating principle induction description over temperature application
• 20:02
  Speaker 1: transmission lines. Application for feeder protection from overcurrent with pilot
• 20:10
  Speaker 1: wire type C rating zero point five to one point
• 20:17
  Speaker 1: five amps. Time characteristics inverse with definite minimum operating principle
• 20:26
  Speaker 1: induction description AC overcurrent volt amps required to operate. Sixteen
• 20:36
  Speaker 1: Application to cut out section of transmission line where sc
• 20:42
  Speaker 1: occurs line sectionalizing Type C four to twelve amps four
• 20:50
  Speaker 1: to sixteen amps. Time characteristics inverse with definite minimum operating
• 20:59
  Speaker 1: principle induction description AC over current volt amps required to operate.
• 21:07
  Speaker 1: Sixteen Application to cut out section of transmission line where
• 21:13
  Speaker 1: sc occurs line sectionalizing Type CoA rating four to twelve amps.
• 21:22
  Speaker 1: Time characteristics inverse with definite minimum operating principle induction description
• 21:31
  Speaker 1: type CO with current indicator volt amps required to operate.
• 21:38
  Speaker 1: Sixteen Application to cut out short circuited sections of transmission
• 21:45
  Speaker 1: line line. Sectionalizing applicable where only low ratio bushing type
• 21:51
  Speaker 1: current transformers are available. Type L E C rating four
• 21:58
  Speaker 1: to twelve amps. Time characteristics inverse with definite minimum operating
• 22:06
  Speaker 1: principle induction description AC overcurrent volt amps required to operate.
• 22:15
  Speaker 1: Two Application to cut out faulty section of high voltage
• 22:21
  Speaker 1: transmission line upon overcurrent. Applicable on circuits carrying less than
• 22:27
  Speaker 1: one hundred amps. Type c B rating four to twelve amps.
• 22:35
  Speaker 1: Time characteristics inverse with definite minimum operating principle induction description
• 22:44
  Speaker 1: AC over current vault amps required to operate forty four
• 22:51
  Speaker 1: Application to cut out faulty line from group of parallel
• 22:56
  Speaker 1: feeders differential current type c D rating three to seven amps.
• 23:04
  Speaker 1: Time characteristics inverse with definite minimum operating principle induction description
• 23:14
  Speaker 1: AC selective differential current voltamps required to operate. Seven Application
• 23:23
  Speaker 1: to cut out faulty sections of transmission lines operates according
• 23:29
  Speaker 1: to distance from vault type c Z rating seventy to
• 23:35
  Speaker 1: one hundred and twenty five volts four to thirty three amps.
• 23:40
  Speaker 1: Time characteristics direct with distance operating principle induction description distance
• 23:49
  Speaker 1: or impedance. Voltamps required to operate. KERR L five voltamps
• 23:57
  Speaker 1: voltage L sixteen voltamps. Application to cut out short circuited
• 24:04
  Speaker 1: section of transmission line with reverse power flow. Applicable at
• 24:09
  Speaker 1: substation end of feeds. Type CR rating four to twelve amps,
• 24:16
  Speaker 1: one hundred and twenty five volts. Time characteristics inverse with
• 24:22
  Speaker 1: definite minimum operating principle induction description AC directional current volt
• 24:31
  Speaker 1: amps required to operate current L seventeen voltage L twenty five.
• 24:39
  Speaker 1: Application to cut out short circuited section of transmission line
• 24:44
  Speaker 1: with reverse power flow. Applicable at substation end of feeders.
• 24:50
  Speaker 1: Type CRA rating four to twelve amps, one hundred and
• 24:56
  Speaker 1: twenty five volts. Time characteristics inverse with definite minimum operating
• 25:04
  Speaker 1: principle induction description Type c R with current indicator volt
• 25:12
  Speaker 1: ams required to operate current L seventeen voltage L twenty five.
• 25:20
  Speaker 1: Application to cut out short circuited section of transmission line
• 25:25
  Speaker 1: with reverse power flow. Applicable at substation end of feeds.
• 25:31
  Speaker 1: Type c Z with directional element rating seventy to one
• 25:37
  Speaker 1: hundred and twenty five vaults four to thirty three amps.
• 25:42
  Speaker 1: Time characteristics direct with distance operating principle induction description direction
• 25:51
  Speaker 1: plus distance volt amps required to operate current L seven
• 25:57
  Speaker 1: voltage L thirty app Application to cut out short circuited
• 26:03
  Speaker 1: section of transmission lines with reverse power flow. Applicable at
• 26:09
  Speaker 1: substation end of feeders or only low ratio bushing type
• 26:14
  Speaker 1: transformers are available. Type L e CR rating four to
• 26:21
  Speaker 1: twelve amps one hundred and twenty five volts. Time characteristics
• 26:26
  Speaker 1: inverse with definite minimum operating principle induction description. AC directional
• 26:35
  Speaker 1: current volt amps required to operate kernel two voltage L
• 26:42
  Speaker 1: twenty five application to cut out grounded section of transmission
• 26:48
  Speaker 1: line line. Sectionalizing applicable on systems with neutral grounded through
• 26:54
  Speaker 1: high resistance type l e C rating zero point five
• 27:01
  Speaker 1: to two point five amps. Time characteristics inverse with definite
• 27:07
  Speaker 1: minimum operating principle induction description AC overcurrent bolt amps required
• 27:16
  Speaker 1: to operate. Two application to cut out grounded line from
• 27:23
  Speaker 1: group of parallel feeders. Differential neutral current type c D
• 27:31
  Speaker 1: rating zero point five to one point two amps. Time
• 27:36
  Speaker 1: characteristics inverse with definite minimum operating principle induction description AC
• 27:46
  Speaker 1: selective differential current bolt amps required to operate. Two. Application
• 27:54
  Speaker 1: to cut out grounded line upon reversal of power flow
• 27:59
  Speaker 1: type l e CR rating zero point five to two
• 28:05
  Speaker 1: point five amps, one hundred and twenty five volts. Time
• 28:09
  Speaker 1: characteristics inverse with definite minimum operating principle induction description. AC
• 28:19
  Speaker 1: directional current folt amps required to operate two application to
• 28:26
  Speaker 1: disconnect grounded lines on solidly grounded neutral and low resistance
• 28:33
  Speaker 1: grounded neutral systems type c Z rating seventy and one
• 28:41
  Speaker 1: hundred and twenty five vaults four to thirty three amps.
• 28:47
  Speaker 1: Time characteristics, direct with distance operating principle induction description distance
• 28:56
  Speaker 1: or impedance fault amps required to operate current L five
• 29:03
  Speaker 1: voltage L sixteen application automatic network relay sectionalizing low voltage
• 29:12
  Speaker 1: networks type c N rating one hundred and twenty volts.
• 29:19
  Speaker 1: Time characteristics, inverse operating principal induction description network relay application.
• 29:30
  Speaker 1: Auxiliary application to trip breaker with AC current from current
• 29:36
  Speaker 1: transformers type b T rating five amps. Time characteristics, instantaneous
• 29:47
  Speaker 1: operating principle, plunger description, current transfer volt amps required to operate.
• 29:56
  Speaker 1: Twenty eight Application to control tripping of circuit breaker where
• 30:03
  Speaker 1: heavy current is required. Type twenty C rating one hundred
• 30:10
  Speaker 1: and twenty five to two hundred fifty volts, seventy five
• 30:14
  Speaker 1: to forty amps. Time characteristics, instantaneous operating principal hinged armature
• 30:24
  Speaker 1: description contactor. Application to control tripping of circuit breaker where
• 30:31
  Speaker 1: heavy current is required. Type thirtyh C rating one hundred
• 30:37
  Speaker 1: and twenty five to two hundred fifty volts one hundred
• 30:41
  Speaker 1: and fifty to seventy five amps. Time characteristics, instantaneous operating principle,
• 30:50
  Speaker 1: hinged armature description contactor application to prevent holding circuit breakers
• 30:58
  Speaker 1: closed on short circa type S one rating one hundred
• 31:04
  Speaker 1: and twenty five to two hundred and fifty volts. Time characteristics,
• 31:09
  Speaker 1: instantaneous operating principle, hinged armature description, trip free application to
• 31:19
  Speaker 1: introduce a definite time delay in switching operations type c
• 31:25
  Speaker 1: V rating special time characteristics, inverse operating principle. Induction description
• 31:36
  Speaker 1: AC voltage application to control time of switching operations. Time
• 31:44
  Speaker 1: delay type GK rating one hundred and ten volts three
• 31:51
  Speaker 1: to forty minutes. Time characteristics, definite operating principle, motor operated
• 32:00
  Speaker 1: description long time delay application. Auxiliary multicontact relays for control
• 32:09
  Speaker 1: circuits for continuous service on AC or DC type AMPC
• 32:16
  Speaker 1: rating eight twelve, sixteen, twenty five thirty two fifty sixty
• 32:22
  Speaker 1: two one hundred and ten one hundred thirty two hundred
• 32:25
  Speaker 1: and fifty volts DC sixty two one hundred and ten
• 32:30
  Speaker 1: one hundred and thirty two hundred and twenty four hundred
• 32:33
  Speaker 1: and forty volts AC time characteristics. Instantaneous operating principal hinged
• 32:43
  Speaker 1: armature description. Multiple contactorvoldams required to operate two wattsman eight wattsmax.
• 32:52
  Speaker 1: Twenty five voldams. Application auxiliary multi contact relays for control
• 32:59
  Speaker 1: circuits for intermittent service on DC only. Type M rating
• 33:07
  Speaker 1: twelve fifty, one hundred and twenty five two hundred and
• 33:10
  Speaker 1: fifty volts DC time characteristics. Instantaneous operating principle. Hinged armature description,
• 33:22
  Speaker 1: multiple contactor volt amps required to operate two watts men
• 33:28
  Speaker 1: eight wattsmax. Twenty five volt amps. Application Auxiliary control and
• 33:36
  Speaker 1: interlocking relays for switchboard control and signal work. Instant automatic
• 33:43
  Speaker 1: reset type OA rating twelve fifty, one hundred and ten
• 33:49
  Speaker 1: two hundred and fifty volts DC time characteristics. Instantaneous operating principle.
• 33:57
  Speaker 1: Plunger description contact making application, auxiliary control and interlocking relays
• 34:06
  Speaker 1: for switchboard control and signal work. Hand reset typel and
• 34:13
  Speaker 1: unlashing coil type OX rating one hundred ten to two
• 34:19
  Speaker 1: hundred twenty AC twelve fifty one hundred and ten two
• 34:23
  Speaker 1: hundred and fifty volts DC time characteristics. Instantaneous operating principle
• 34:31
  Speaker 1: Plunger description, contact making application, auxiliary control and interlocking relays
• 34:41
  Speaker 1: for switchboard control and signal work holding coil type OS
• 34:48
  Speaker 1: rating twelve fifty one hundred and ten two fifty volts
• 34:53
  Speaker 1: DC time characteristics, Instantaneous operating principle. Plunger description, contact making application, banked,
• 35:06
  Speaker 1: multi contactor supervisory control type m S rating special time characteristics,
• 35:17
  Speaker 1: definite description supervisory group of contacts. Application indicator to indicate
• 35:26
  Speaker 1: when relay has functioned, type C rating zero point one
• 35:33
  Speaker 1: and one amps time characteristics, instantaneous operating principle, hinged armature description,
• 35:43
  Speaker 1: operation indicator application frequency relay to actuate an alarm or
• 35:51
  Speaker 1: trip a circuit upon a rise or fall in frequency
• 35:55
  Speaker 1: type r F rating one hundred and ten bolts rated
• 36:00
  Speaker 1: frequency time characteristics. Instantaneous operating principal plunger description two coils
• 36:11
  Speaker 1: with balanced lever. End of Chapter eight