US1778207A - Test set - Google Patents

Test set Download PDF

Info

Publication number
US1778207A
US1778207A US203654A US20365427A US1778207A US 1778207 A US1778207 A US 1778207A US 203654 A US203654 A US 203654A US 20365427 A US20365427 A US 20365427A US 1778207 A US1778207 A US 1778207A
Authority
US
United States
Prior art keywords
line
coil
generator
clip
finder
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US203654A
Other languages
English (en)
Inventor
Clarence A Anderson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
American Electric Power Co Inc
Original Assignee
American Electric Power Co Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to BE352632D priority Critical patent/BE352632A/xx
Application filed by American Electric Power Co Inc filed Critical American Electric Power Co Inc
Priority to US203654A priority patent/US1778207A/en
Priority to FR662634D priority patent/FR662634A/fr
Application granted granted Critical
Publication of US1778207A publication Critical patent/US1778207A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/22—Arrangements for supervision, monitoring or testing
    • H04M3/26—Arrangements for supervision, monitoring or testing with means for applying test signals or for measuring
    • H04M3/28—Automatic routine testing ; Fault testing; Installation testing; Test methods, test equipment or test arrangements therefor

Definitions

  • This invention relates to test sets for use in locating faults in transmission lines, especially telephone and telegraph transmission lines, and it is an object of this invention to produce a portable test set which shall be reliable in action, simple and rugged in construction, and which shall be economical of manufacture.
  • a feature of the invention consists in the novel circuit arrangement whereby a more reliable action is obtained.
  • Another feature of the invention consists in the compact and expedient arrangement of the various parts whereby the test set is rendered more con venient to use. Additional features will be evident from the detailed description.
  • Figure 1 is a diagram of the electrical circuit
  • Figure 2 is a perspective view of the set with a portion of the box broken/ away to show the arrangement on the inside thereof
  • Fi ure 3 is a -top view of the complete box with the cover open
  • Figure 4 is a side view of the generator unit with the various parts mounted thereon
  • Figure 5 is a side View of the finder coil
  • Figure 6 is a front view partly in section of the finder coil
  • Figure 7 is a section along the terminal clip of Fig. 6.
  • Fig. 1 of the drawings 1 indicates a magneto generator of the standas 2, 3- and 4, arranged to be automatically operated in the well known manner upon the operation of the generator.
  • the contacts 3 and 4 open and the contact 2 closes.
  • the shaft 5 which is in electrical contact with one of the ter-I minals of the generator winding comes into electrical contact with left hand spring of contact 4.
  • the generator is provided with a pair of interrupter contacts 23, arranged to closea moment after the voltage wave passes its peak during each half of the cycle.
  • an adjustable calibrated non-inductive resistance or rheostat 6 a telephone transmitter 7, an induction coil 8, battery 9, condenser 10, and signal lamp I 11.
  • the finder consists of an oblong coil having a core 31, and upper and lower ironpole' pieces 32 at the two ends of the coil, respectively.
  • the coil 30 is fastened to the lower jaw of a spring clip by means of two screws which pass through the lower jaw of the clip and both pole pieces, the upper of which is threaded to receive the screws.
  • spring clip is of a standard ty e in which the jaws 36 are held to ether y the tension of clampin springs 3 placed at each end of the clip. r iortions of the jaws 36 are extended at the rearto form handles 38, whereby the jaws ma be forced open by pivoting. a 0
  • T ere is ormed on each formed by depressing the metal of which the handle is made. This gives the handle rigidit against bending.
  • the terminal leads from t e coil 30 are placed one in each groove,
  • the spring clip is made of magnetic material and acts as a path for any flux that passes through the coil 30.
  • a shield 40 which covers the lead wires from the coil 30 and protects them against dama e.
  • the shield 40 is made of magnetic maternal and also improves the magnetic circuit at the meeting point of the upper and lower jaws of the clip.
  • the terminal block 41 preferably comprises a tube of insulating material with the necessary fittings and is secured to the lower handle-38 side of t e center line of the handle a groove by means of two screws, one of which is 7 into which may be placed the conducting tip 5 the threaded hole 48.
  • the insulating tube and the three slugs 43, 44 and 45, together with the separatlng washers are preferably assembled before any holes are drilled, the drilling and tapping operations being performed on the assembled unit.
  • the upper jaw 36 is opened outwardly from the coil by forc- .ing the handles 38 together and the clip is passed over a wire which is to be tested.
  • the finder coil 1 In making a test for ground one metallic circuit, the finder coil 1s left in its normal position. encircling the conductor. link 22 shown in Fig. 1, and one of the test CllPS for example clip 21, is connectedto a groun wire orother good ground connection and nating current from the generator, flowing through the link 22 will produce an alternating flux, and this alternating flux will induce an alternating voltage .in the: coil 30 of the finder 19.
  • the finder 19 and the telephone receiver 18 being-connected in a loop which is closed at the contact 2-controlled by the generator shaft, an alternating current will flow in that loop and produce an audible sound in the telephone receiver.
  • the intermittent closure of the contacts 23 occurs twice per cycle, a moment-after the peak of the output wave of the generator is reached.
  • the closure of the contacts 23 resultsin the short circuiting of the generator 1 by way of the back contact of the switch S
  • a discharge path for the condenser 10 through the line that is being tested, said path extending from ground at'the remote end of the line, through the line to the clip den discharge 'of the condenser the other clip connected first to one line and then to the other.
  • the lineman operates the generator.
  • the contacts 3 and 4 open, the contact 2 closes, and a connection is'established'between the 5 of the generator. If the cli 20 happens to be connected to the line whic is grounded,
  • the clip 20 Since the size of the-line wire is known, the length If the line extends in both directions from the point where the test was made, it is-now necessary to determine the direction. to the trouble. To -do this, the clip 20 is kept on the grounded line and the coil 19 is. removed from around the conductor link 22 and is placed around'the grounded line wire, so that it encircles the line wire in the same manner as it 'previou sl encircled the link 22.
  • the finder coil is p aced around the line wire first on one side of the ch 20 and then ince the current is flowing along the line from the clip 20 to ground, a current will be induced in the coil 19 when the coil is. on the line between the clip 20 and the grounded point, whereas if the coil 19 is on the other side of will beno current flowing fromthe gener ator through the portion of the line embraced by the clip, hence no current will be induced in the coil 30.
  • a sound. is heard in the telephone receivera
  • the presence or absence .of sound in the telephone receiver will be an indication of whether the finder coil is on p the side of the line between the clip 20 and i to the short is then performed in the same manner.
  • the resistance 6 is varied until the intensity of the current induced in the coil of the finder as measured by the intensity of the sound in the receiver, is substantially unchanged when the resistance 6 is substituted for the line resistance by depressing the switch S It should be remembered that now the rheostat reading re resents the combined resistance of the two inc I as that in. the case of a grounded line.
  • finder coil is placed around one of the lines
  • the telephone receiver may be dispensed with and the lamp 11 used as an indicator.
  • the testis performed v I in the same manner as was previously described except the switch S is artially operated so that it closes its first ont contact but not its second front contact. Under those conditions, the lamp 11 is connected across the condensor 10 and. the interrupter contacts 23 are disconnected at the switch S With the clip 21 connected to groundand the clip 20 connected to the grounded line, a
  • test for distance to the fault may then be performed in the manner previously explained.
  • the top 62 may be held closed exchange and notify'him that the trouble has by an ordinary hasp.
  • the cover section 63 is been cleared and the line is now ready for provided with a celluloid window 69 placed to each line, and if the distance to the ex of the lamp may be observed.
  • the generator is I To the inside of the cover portion 62 there I erated without operating the switch 1, is secured a metal rod 22 about which the thereby projecting ringing current over th finder coil 19 may be clasped.
  • the rod is conline through the condenser 10. If the disnected to the twoinsulated conducting hinges tance to the exchangels too great to ring 64 nd 65, by two conductors placed in through the condenser 10, the switch S 18 grooves on the inner side of the cover.
  • the tact 4 link 22, to the line clip 21 by Way Of handle for turning the generator are carried the back o ta of th SWlteh 2-
  • the varlable resistance 6 may S S -and S are mountedas a unitary tin I Under ture in the chamber to the right of the plate those conditions the resistance to the fault 7() g y e m y pp x e by Qp g
  • the magneto generator 1 is of standard the swltch S as before.
  • the generator unit is secured to the case by two screws (not shown) dlcetes the pp m t dlfiel'ence m e passed thru the bottom of the case into cordistance. res ondin holes drilled in the bottom of the Refe'rencef'may be now had to Figures 2, i t itf 6. 'The different intensity inthe sound incal arrangement of the various parts constituting the test set.
  • the box 60 is made of wood, and is covered with a fibrous protective coating.
  • the box is provided with a cover formed in .two sections 62, and 63.
  • the cover section 62 is hinged to the section 63 by the hinges 64 and 65, while the section by means of a clamp 71.
  • a cover plate 76 To the top of the magneto thereis fastened a cover plate 76 by means of a bracket 75.
  • An inverted L- shaped plate 77 is secured to the lower side of the cover plate.
  • the plate 77 acts as a support for the contacts controlled-by the
  • the box 60 is divided into two sections by e receiver is'ihcl'eesed arranged to be operated by the-outward contacts 23 consisting of a spring member
  • the condenser10 is secured to the magneto switches S1, and S and for the transmitter further use, the clips 2021 are clamped one opposite the lamp 11, whereby the condition ing contact with conducting projections 23 Y 63 is g to the box y the h g and 7.
  • the springs 78 and 7 9 are insulated from 'is further secured to the bOX y means each other and are fastened tothe plate 77 screws 67 passed through the holes 68. By by means of screws, as may be seen in Fig- 65 this aran'gement the section62 maybe opened ure 4.
  • the springs controlled by the switch S are secured to the plate 77 in a, similar manner, as shown in Figure 2.
  • a section 85 is punched in the cover plate andthe metal is bent down at 85' to form a support for the springs 80,81, and 82 of the switch S
  • the induction coil 8 is mounted on the lower side of the cover plate 76 in a position shown in Figures 2 and 4.
  • the lamp 11 is "mounted on the cover plate in any well known manner. There is also provided two binding posts 91, insulated from thecover plate, to which are connected leads from therheostat 6. a When the push button S shown in Figure 4 is pushed with the'flat portion of the thumb until the thumb encounters the box, the right hand back contact shown in Figure 1 will be opened and the middle front contact will be closed, but the outer left front contact will still be open. If the push button S is pushed in further, for instance with the tip of the thumb, the outer left front contact will also be closed.
  • the lineman may findit rather inconvenient to hold the box with the transmitter 7 (Fig. 2) before him. Under su'cliconditions it isfrequently quite convenient 'to talk directly into the left hand chamber of the box, the
  • a line test set wherein a telephone receiver and a finder coil'are connected in series across two lineclips, a generator, ,9.
  • a line test set mounted in a case and including means for connecting the set to a line to be tested, an inductance coil, 2. conducting link permanently mounted within the case and connected in serieswith said means, said coil being normally inductively coupled with said link.
  • a line test set mounted in a case and including a pair of line clips to be connected to line to be tested, an inductance coil removably held in said case and connected with the rest of the set by flexible leads, a conducting link within the case connected in series with said clips, said coil being normally inductively coupled with said link, a
  • testing circuit including said link and said line to be tested, a variable artificial line within the case, means for establishing a circuit either to the line to be tested or to the artificial line, and induction means for comparing the current flow in the two lines.
  • a line test set including means for connecting the set to a line to be tested, a conducting link and a variable calibrated resistor, means for connecting the conducting link in series with the line tdbe' tested or with said resistor, and an inductance coil adapted to be mounted in inductive relationship with said conducting link.
  • Aline test set mounted in a case and including a pair of line clips to be connected to a line to be tested an inductance coil, a
  • a line test set mounted in a case and including means for connecting the set a'line to be tested, a resistor, a conducting link within the case connected in series with said means, means for substituting the resistor for the clip in said series circuit, an inductance coil normally inductively coupled with said link, and a telephone receiver connected to detect current flow in said inductance coil.
  • a line test set including a magneto generator having mounted thereon to form an integral unit, a switch, a condenser, a battery, and a telephone transmitter, a box divided into two compartments in one of which the unit is mounted, and a telephone receiver, an inductance coil and a line clip electrically connected with said unit carried in the other compartment.
  • a test set case having mounted therein a generator to which is secured a tele hone transmitten'said case having a plurallty of small holes formed therein opposite the transmitter through which sound may pass to the I transmitter, a partition dividing the case into two compartments, said partition having formed therein a number of small holes through which sound may'pass to the transmitter.
  • a v 14 A finder having an iron core and a winding therefor mounted between two spring pressed jaws of magnetic material, one
  • a receiver and a-conde'nser normally connected to said line clips, a generator, means effective updn the operation of the generator for disconnecting the receiver from the line clips periodically short-circuiting' the generator,
  • a finder consisting of a clip having two pivoted vjaws of magnetic material pressed against each other by. a spring, an obong coil having an iron core mounted between said jaws, said core being secured to one of said jaws 'so as to be included in a series magnetic circuit with both of said jaws and spaced from the pivot oint of the jaws,-
  • a finder consisting of a pair of pivoted jaws, acoil mounted betweensaid .jaws, sai djaws being extended to form two handles for opening the jaws, aterminal block consisting disconnecting the receiver from the line clips and .for connecting the generator to the line clips in series with the condenser, a lamp, and
  • a two-position key for bridging the lamp across the condenser when operated to its first position and for shunting the lamp and the leacondenser when operated to its second position.
  • a line test set comprising a generator, a transmitter mounted on the generator, and a case having a partition dividing the case into two compartments, the first compartment he'- ing adapted to house thegenerator and transmitter unit, said partition having holes through which sound directed into the second of a-cylindrical insulating casing containing compartment may pass to the transmitter.
  • said'terminal block being secured to one hanhand e and one slug, the other two slugs each having two holes drilled through the easing into the slug, one of said two holes being for the first compartment hinged to the case,
  • a line test set case comprising two compartments,- the first compartment adapted to and a second cover for the secondcompa-rt- .mentzhi'nged to the firstv cover.
  • a line test set comprising a generator, a receiver,'and a finder coil, said case comprising two compartments, the first compartment adapted to house the generator, and the second compartment adapted to serve as a space for the receiver, a cover for the first compartment hinged to said case, and a second cover for the second compartment hinged to said first cover, said second cover having a pocket adapted to serve as a space for the finder coil.
  • a line. test set mounted in a case, a finder coil, a cover hinged to the case by means of two electrically insulated hinges, a conducting link mounted in said cover and adapted to support said finder coil, said conductor link being electrically connected to the test set through said hinges.
  • a finder consisting of a clip having two spring jaws pivoted at one end, a coil having an iron core, one end of said core being secured to the free end of one of said jaws, the other end of'said core .bein adapted to engage the free end of the other ofsaid jaws, and 'a magnetic circuit closed by said jaws including said core and the sections of said jaws between the respective points of contact with said core and the pivoted end.
  • a pair of line clips a condenser, a receiver normally connected across said line clips. in series with said condenser, a generator, a finder coil, and means controlled by the generator for'disconnecting said receiver from said line clips and connecting it across said finder coil and for connecting said generator across said line clips in series with said condenser.
  • a pair of line clips, a condenser, an induction coil, a receiver normally bridged across said line clips in series with said line clips and a winding of said induction coil, a generator, a finder coil, and means controlled by said generator for disconnecting said receiver from said line clips, said condenser al ld said induction coil winding and for connecting it across said finder coil, and for bridging said generator across said line clips in series with said condenser.
  • test set including means for connecting the setv to outside conductors to be tested, a conducting link connectedin series with said means, an inductance coil normally inductively coupled with said link, and means for testing conductors with said inductance coil in either its normal position or inductively, coupled with one of the conductors under test.
  • test set including means for connecting the set to line conductors to be tested, a conducting link connected in series with said means, an inductance coil normally inductively coupled with said link, means for performing certain tests on the line conductors with said inductance coil in normal position, and means for performing certain other tests on the line with said inductance coil inductively coupled with one of the conductors under test.
  • a line test set mounted in a case and includin means for connecting the set to the line con uctors to be tested, a conducting link within the case connected in series with said means, an inductance coil adapted to be inductively coupled with a line conductor under test but normally carried in the case in inductive relation with said link, and means for testing a line without removing said inductance coil from the case.
  • an induction coil In a line test set, an induction coil, a primary winding for said coil permanently mounted in said set, a secondary winding normally associated with said primary winding, arrangements whereby said secondary winding may be readily removed from the set and placed in inductive relation to outside conductors, and a receiver connected to said secondary winding when the same is in use in either case.
  • a finder coil for use outside the set and connected to the same by flexible conductors, a compartment inside the set for storing said coil, and a conductor in said compartment with which the coil is inductively coupled when stored in the compartment.
  • a line test set including a magneto generator having mounted thereon to form an integral unit, a switch, a condenser, a battery, and a telephone transmitter, a box divided :into two compartments in one of which the unit is mounted, and a conductin link comprisin a rigid conductor electrica y connected wit said unit mounted in the other compartment.

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
US203654A 1927-07-05 1927-07-05 Test set Expired - Lifetime US1778207A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
BE352632D BE352632A (enrdf_load_stackoverflow) 1927-07-05
US203654A US1778207A (en) 1927-07-05 1927-07-05 Test set
FR662634D FR662634A (fr) 1927-07-05 1928-07-05 Perfectionnements aux appareils de vérification des lignes de transmissions, notamment des lignes télégraphiques et téléphoniques

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US203654A US1778207A (en) 1927-07-05 1927-07-05 Test set

Publications (1)

Publication Number Publication Date
US1778207A true US1778207A (en) 1930-10-14

Family

ID=22754796

Family Applications (1)

Application Number Title Priority Date Filing Date
US203654A Expired - Lifetime US1778207A (en) 1927-07-05 1927-07-05 Test set

Country Status (3)

Country Link
US (1) US1778207A (enrdf_load_stackoverflow)
BE (1) BE352632A (enrdf_load_stackoverflow)
FR (1) FR662634A (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2689885A (en) * 1950-04-11 1954-09-21 Webster Electric Co Inc Transducer
US3173998A (en) * 1960-12-19 1965-03-16 Howard R Deuser Testing equipment for telephone lines

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2689885A (en) * 1950-04-11 1954-09-21 Webster Electric Co Inc Transducer
US3173998A (en) * 1960-12-19 1965-03-16 Howard R Deuser Testing equipment for telephone lines

Also Published As

Publication number Publication date
FR662634A (fr) 1929-08-09
BE352632A (enrdf_load_stackoverflow)

Similar Documents

Publication Publication Date Title
US1296687A (en) Means for signaling from captive balloons.
US2291533A (en) Trouble finder cable tone device
US1778207A (en) Test set
US2277228A (en) Telephone system
US2142304A (en) Trouble finder
US1726947A (en) Distant control device for use over telephone lines
US1724973A (en) Testing device
US1462053A (en) Electrical testing system
US1868960A (en) Test set
US2789236A (en) Tone generator for cable testing
US3749857A (en) Cable testing device for long-distance cables, particularly for occupied cables
US2342781A (en) Combined mercury interrupter and transformer
US1835255A (en) Test set
US1384734A (en) Electrical testing system and apparatus
US1662548A (en) Testing device
US2303564A (en) Alternating current generator
US1161082A (en) Testing device.
GB293378A (en) Improvements in or relating to test sets for locating faults in electric transmission lines
US2963552A (en) Telephone subset current generator
US1548592A (en) Testing circuits
US1575743A (en) Telephone installation
US980357A (en) Multiplex telephony and telegraphy.
US1689598A (en) Telephone substation circuits
Smith Telephony, Including Automatic Switching...
US1672933A (en) Lineman's test set