Патент USA US2134962код для вставки
Nov. 1, 1938. F. T. WARMINGTON arm. 2,134,962. TRACK CIRCUIT FOR RAILROADS \ ‘Filed Aug. 27, 1934 FIG. 1. INVE‘Ni'OEZS ' ' EIWm-mjngbn sLPupert ' c THEIR ATTORNEY -- 1" Patented Nov. 1, 1938 ‘2,134,962 * UNlTEDfsl'rATES ‘PATENT 7 OFFICE v . .. .V.‘2:’_134,952¥ - . v . ' TRACK‘ ornourr FOR RAILROADS ' Floyd~ T. Warmin-gton and Louis Rupert, Detroit, Mich.,.. assignors ‘to General .Railway. Signal ' _Cornpa?_ny,v Rochester, N," Y. Y . . Y Y '- , a‘ ‘ > Application August 27, 1934,‘ Serial No. 741,615 ‘ " ‘ ' 1 Claim. ' (or; This invention relates totrack circuits for rail roads, and more particularlyto means for regu lating the voltage supplied to a1 direct current track circuit to compensate for variations in bal last resistance. » ~ , In the usual and well-known track circuit, with a given supply of voltage at the feed end, the current supplied to theitrack relay depends up on the‘ ballast resistance;--and if an adjustment of the supply of voltage ~-is’5ma'de tofprovide s'uf-_ .?cient operating current for the relayunder wet conditions of'the ballast'and high ballast leak age, there is excess current through the relay under dry ballast conditions and low ballast‘ 15 leakage, which tends to interfere with the proper shunting of the track relay. Generally speaking, in accordance with this invention, it is proposed to provide a source ‘of uni-directional voltage for a track circuit which 20 is automatically varied in accordance with changes in ballast conditions for the purpose of maintaining the current through the track relay substantially constant and render its shunting more reliable. , The drawing illustrates in a diagrammatic and simpli?ed manner different ‘speci?c embodiments of the invention. Fig. 1 shows one form of- the invention particularly applicable to the use of storage batteries; Fig. 2 shows a modi?cation suitable for primary batteries; and Fig. 3 shows a modi?cation in the manner in Which the cur rent supplied by the track battery is varied. The invention contemplates the usual and well known arrangement for a track circuit, in which 35 the track rails I and 2 are bonded in the usual way, with insulated joints 3 de?ning the ends of the track section, and with a track relay TR of the usual type and construction connected across the track rails l and 2 at one end of the 24641) ( former T2,v having its primary connected‘ to the alternating‘ current-supply; One end of this!‘ ground circuit is connected to as'uitable ground 6, and the other end to the mid-point of a re sistance l , across ,_ the battery leads'or directly across the‘ rails; Theground 6‘is preferably ‘as sociated with theballast for the track,‘ and‘ is in ‘the form of a plate,‘ rail, or the like buried in’ the ballast;'and'lhavingsu?icient- area toaprovide a‘ ' resistance to ground commensurate-With the‘bal last resistance of the track circuit. The resist ance 1 is relatively high so‘ as not .to interfere 15 materially with the supply of the current from battery B to- the track circuit. In this arrangement of Fig. 1, the current sup pliedto the track circuit is derived from the bat tery B and the recti?er R. The current sup plied to the recti?er vR depends upon the sub 20 stantially ?xed voltage of the transformer T and the variable current in the secondary of the The current in the primary of the transformer Tl in turn depends upon the 25 transformer Tl . substantially ?xed voltage of the transformer T2 and the resistance of the ballast as indicated by the resistance between the ground 6,resistance 1, and resistance of the track rails l and 2 to ground. 7 Thus, ‘as the ballast becomes wet and the bal last leakage increases to reduce the current sup plied to the track relay TR, more current ?ows 30 in the ballast resistance detecting circuit, there by supplying more current from the secondary 35 of the transformer TI to the recti?er R to in crease the current fed to the track circuit. Con versely, as the ballast dries out, less current is supplied to the track circuit from the recti?er R. track section. The present invention! relates In this way, the supply of current to the track more particularly to the supply of current at the , circuit is automatically regulated, within limits, 40 feed end of the track section. in accordance with variations in the ballast re Referring to Fig. 1, the track battery B, as . sistance, so as to maintain the current through sumed to be in the form of a storage battery, is the track relay TR substantially constant, and 45 connected across the track rails l and 2 in series it responsive to a substantially same wheel 45 with an adjustable limitingresistance 4 in the render shunt under various ballast conditions. usual way. The output circuit of a double-wave . Referring to Fig. 2, the track battery BI is con recti?er R of the usual type and construction, ‘ nected to the track rails I and 2 in series with the preferably of the dry-plate or copper-oxide type, output circuit of the rectifier Ri, and the limit 50 is connected across the battery B; and the in ing resistance 4. The input circuit-of the rec 50 put circuit of this recti?er includes the second ti?er RI is connected to the secondary of the aries of two transformers T and TI. The pri mary of transformer T is supplied with alternat ing vcurrent from a suitable transmission line con 55 nected to an alternating current generator G. . The primary of the transformer TI is connected in a ground or'ballast resistance detecting cir cuit which includes'the secondary of a trans transformer TI, having'its primary in a ballast resistance detecting circuit energized by a trans former T2 and terminating in a ground 6 and resistance 1 connected to the track rails. In this 55 v2 2,134,962 to supply su?icient current for the relay TR. In this arrangement of Fig. 3, the adjustment of the feed voltage is made in steps, rather than gradu ally as the arrangements of Figs. 1 and 2; but such single step adjustment is adequate for cer track circuit to compensate for the greater loss . tain types of track circuits having a limited range of current by ballast leakage. Referring to the modi?cation of Fig. 3, the of ballast resistance variation. This invention is characterized by the provi-» track battery B is connected across the. track .sion of a ground-circuit detecting or: indicating arrangement, as the current in the ground circuit increases due to lowered ballast resistance, the current supplied to the recti?er RI is increased, and this increases the current supplied to the rails I and 2_ in series with‘ an adjustable resist 10 ance 8, in addition to the usual adjustable limit variations in the ballast resistance or leakage of 10 the track circuit, andvariations in the current in nating current, establishes a short circuit through ' this ground circuit act to change the current sup ing resistance 4. A relay 9, responsive to alter plied to the track circuit so as to compensate for the change in ballast conditions. The speci?c organization and arrangement of means shown 15 15 at one end of the ground 6, includes’ an adjust: and described for performing the desired func able reactance or resistancelll and is'connected. tions are merely illustrative; and various modi at its ‘other end to terminals of corresponding po ?cations .and adaptations may be made without tential of two secondaries of a transformer v‘I33, the other terminals of said. secondaries being \ departing from the invention. 20 . -What we claim is: 20 connected across the track rails I and'2; and the A track: circuit comprising a battery, a trans primary of‘ this transformer being supplied with alternating current ‘from a suitable source G. former with, two equal independent secondaries so connected to the rails and through an electro The ‘resistance/of the secondary of the trans responsive device to ground that there is no differ former T3 is relatively high, so, as notto inter ence in alternating current potential between the 25 25 fere with the operation of the track circuit. In this arrangement of Fig.3, when the ballast rails and ‘equal alternating current potential from rail to ground, and. means governed by said becomes wet, and its resistance falls below some each device for. . varying the "voltage applied 7 from. the critical value rendering the response. of thertrack battery to the track‘ circuit to- conform with relay TR uncertain, relay 9 is su?iciently ener its front contact l0 around the resistance 18. The energizing circuit for the relay 9, terminating .130 gized to close its front contact In and short cir cuitthe resistance '8,~so‘ that the inter-rail volt age in the feed end of the track circuit is increased variations inlrballast resistance. FLOYD T.’ WARMINGTON. LOUIS RUPERT.