www. ElectricalPartManuals. com INSTRUCTIONS TEMPERATURE INDICATOR OPERATION INSTALLATION RECEIVING

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1 + DC SOURCE --=-TN:oo RE S I STANCE--- COl L I.L SA RECEIVING INSTALLATION OPERATION INSTRUCTIONS TEMPERATURE INDICATOR Hottst Spot Rsistanc Bridg Typ Wall Mountd Switchboard Indicating CURRENT TRANSFORMER --OIL LEVEL HEATING COIL FIG. 1. Schmatic Diagram o Connctions. THE BRIDGE TYPE HOTTEST SPOT TEM PERATURE INDICATOR for switchboard mounting consists of a spacially dsignd galvanomtr, a rsistanc bridg, on lg of which is mbddd in a hating coil locatd in th top oil of th transformr, a currnt transformr, and an xtrnal trminal box. Th hating coil is connctd to th scondary of th currnt transformr. During normal opration currnt flows in th hating coil sction continuously so that th hottst spot tmpratur of th transformr winding may b found at any tim by turning th Typ W switch from off to th dsird position. This hottst spot indicator is dsignd for short priods of indication, but may b safly usd for continuous indication SUPERSEDES I.L RESISTANCE COIL HE ATING COIL NOTE: -1' <+----SOL I D Ll N E S INDICATE CONNECTIONS MADE OUTSIDE TRANSFORMER. DASHED LINES INDICATE CONNECTIONS MADE INSIDE TRANSFORMER. FIG.. Front and Rar Connctions on Trminal Block. providing th tmpratur indication is rcognizd as bing 1 o to C high (th xact valu may b dtrmind by tst). Th addd tmpratur ris is du to th continuous flow of currnt in th rsistanc coil and th rsulting hating. If dsird, th tmpraturs of a numbr of transformrs can b rad on on instrumnt by using a multi-point switch at th switchboard. Fig. 1 shows a schmatic diagram of th arrangmnt of th quipmnt for rading th tmpratur of on winding. SHIPPING AND RECEIVING Th currnt transformr is usually shippd as part of th main transformr and is usually of th through typ which is slippd ovr th lowr nd EFFECTIVE SEPTEMBER, 195

2 TEMPERATURE INDICATOR -- SWITCHES ARE SHOWN AS VIEWED FROM ABOVE WITH HANDLE END AT TOP, INDICATOR ALL L-1 LEADS MUST BE WITHIN 0.0 OHMS OF THE SAME RESISTANCE. ALL L- LEADS MUST '----..:::-:--:::-..J BE 0 F N E G Ll G I B LE RESISTANCE EACH LEAD NOT MORE THAN 0.0 OHMS. ' I 1., I ; q : f c. : "'- -J r ; - ': Tl _..L- y SEE NOTE!14) T FIG. 3. of th bushing and mountd on th undr sid of th covr. Somtims it will b mountd on th top of th trminal board, bridgs, or nd frams. In this cas, a Micarta tub will probably b usd to conduct th currnt transformr lads to th trminal box. This tub will b installd in plac on th currnt transformr. If th main transformr is not shippd in its tank, th tub is slid down or rmovd and tid to th currnt transformr. Th xtrnal trminal box will always b in plac, and will b covrd by a wathrproof conduit box. It may b a box as shown in Fig. 5 or a larg box to tak car of a numbr of lads including som not for th hot spot indicator. Th hating coil and rsistanc lmnt form an intgral unit which is shippd in plac whnvr possibl. If this cannot b don, it is shippd in a sparat packag markd "Dtails". Th fixd rsistanc coils ar assmbld in th indicator for mounting on th switchboard. LR ;, I ER SUPPLIED ONLY WHEN POWER SUPPLY IS 10 V. 45 TO 64 CYCLES. CONTACT SELECTOR SWITCH S" S'* S*' POSITION OFF CAL I I TABULATION POSITION Wiring Diagram for Tmpratur Indicator. 16 -INDICATES CONTACTS CLOSED IN POSITION SHOWN NOTE: IF LESS THAN 6 RESISTANCE COILS ARE USED CONNECT THE BLANK STUDS TO ONE OF THE RESISTANCE COILS AS INDJCATED BY THE DOTTED JUMPERS, x-y CONNECT TO AND Y TO 14 OF SUCCESSIVE DRUM SWITCHES FOR MORE THAN 6 RESISTANCE COiLS. OTHER CONNECTIONS SIMILAR TO THOSE SHOWN, Th drum switch and th rhostat ar shippd in a sparat packag markd "Dtails". Extrnal rsistors and/or rctifirs, if ordrd, will also b found in this packag. INSTALLATION A typical mthod of installing th hot spot indicator whn it is shippd sparatly is outlind blow. Always follow th instructions on th diagram, diagram namplat and outlin drawing for a particular installation. 1. Insrt th hating coil with its mbddd rsistanc through th propr hol in th wall and fastn scurly in plac. Th location of th hol is shown on th outlin drawing for th transformr.. Connct th two lads from th hating coil to th two studs markd 1 and 4 on th trminal block (on th insid of th transformr). S Fig Connct th two lads from th currnt transformr to th two studs 5 and 6, on th trwww. ElctricalPartManuals. com

3 TEMPERATURE INDICATOR ;.;. I. ;;; L 4 ;.; 6 -..;. 7 ;;.; 17-8 ;;,;.; A PLAN VIEW OF ETERNAL TERMINAL BLOCK JUMPERS FOR SHORT CIRCUITING CURRENT TRANSFORMER (5-6) WHEN NOT IN USE. FIG. 4. DEGRE1ES O CENTI< RADE ISO I./ Dial and Jumpr for Short Circuiting Currnt Transformr Whn Not in Us. minal block (on th insid of th transformr). Th lads ar connctd to th propr trminals of th currnt transformr at th factory whn th trans-!-+-to CURR. TRANS - }1f.I II... D I RESISTANCE L 101" (MIN.) COIL HEATING COIL WEATHER- PROOF COVER FOR TERMINAL BLOCK WEATHER-PROOF CABLE AND FITTING FIG. 5. formr is tstd, and ths connctions should not b changd. 4. If a bushing-typ currnt transformr is usd, it is usually shippd mountd in plac undr th covr around on of th bushings. 5. Using th wathrproof cabl, connct th two lads from th rsistanc coil mbddd in th wll to th studs markd and 3 on th outsid of th xtrnal trminal block. 6. Mount th tmpratur indicator and rsistanc bridg on th switchboard and connct to th trminal box on th transformr as shown in Fig. 3 using (9700 C. M.) rubbr-insulatd wathrproof cabl, or largr. OPERATION Th currnt transformr is mountd insid th tank of th powr transformr, usually on a bushing. Its primary winding carris th main currnt of on of th transformr windings and its scondary winding dlivrs to th hating coil a rducd currnt which is at all tims proportional to th load currnt. Th insulation of th currnt transformr srvs to protct th hating coil and tmpratur indicating quipmnt from th high voltag of th main transformr windings. ALLOW ABOUT 01N. LEAD FROM TERMINALS TO EN ABLE 0 TO BE LIFTED AND CONNECTIONS MADE. Typical Installation with Bushing Currnt Transformr. CURRENT TRANSFORMER LEADS ARE CONNECTED TO PROPER TAP AT THE FACTORY. OTHER' TAPS ARE TAPED. DO NOT CHANGE CONNEC TION. 3

4 TEMPERATURE INDICATOR -- Th hating coil is placd in th hot top oil and its winding is workd at approximatly th sam currnt dnsity as th main transformr. In addition, th thrmal insulation of th hating coil is such that th lvation in tmpratur abov oil is th sam as that of th windings of th main transformr plus convntional l0 C hottst spot allowanc undr full load conditions. By ths mthods, th hottst spot tmpratur insid th transformr windings is duplicatd at th rsistanc coil which is mbddd insid th hating coil. Th rsistanc coil mbddd in th wll of th hating coil forms on arm of a Whatston Bridg, th othr thr arms bing mad up of fixd rsistancs. Th valus of ths ar so slctd that with th mbddd rsistanc at th tmpratur markd by th rd lin on th instrumnt dial, th bridg is balancd; that is, no currnt flows through th galvanomtr whn a dirct-currnt voltag is applid btwn points WBl and (s Fig. l). Th instrumnt should thrfor rad this valu whn disconnctd from th circuit. Any variation in th tmpratur of th mbddd rsistanc changs its rsistanc thus causing an unbalanc in th bridg and a currnt will flow through th galvanomtr. Thr is a dfinit rlation btwn this currnt and th tmpratur of th rsistanc coil making it possibl to calibrat th galvanomtr scal to rad dirctly in dgrs cntigrad. Th instrumnt, which may b ithr indicating or a graphic rcording typ, is arrangd for switchboard mounting. Th rsistanc coil in th tank lmnt is usually sparatd from th fixd rsistancs of th bridg by long lads. Ordinarily, th d- sourc for dflction of th galvanomtr would b applid to WBl and WB, but bcaus of th xtnsion of bridg lg WB-WB4 to -3, this voltag is applid at point and through a sris rsistanc at WBl. This balancs th lads and has th sam nt ffct as th usual application of th d- sourc in a Whatston Bridg. It dos not, howvr, corrct for drop in currnt through th bridg du to th addd rsistanc. This is accomplishd by incrasing th voltag applid to th bridg. Th corrct voltag to apply is dtrmind by mans of th Tst Rsistor and th adjusting rhostat. Th tst rsistor has a fixd rsistanc of ohms which is th rsistanc th rsistanc coil would hav at 0 C. Conncting th tst rsistor across th opn lg of th bridg would caus th instrumnt to indicat ooc providd th voltag was right and thr was no unbalanc du to lad rsistanc. Th lad rsistancs ar balancd out by conncting on nd of th tst rsistor to point by lad -TRl having th sam rsistanc as -WB. Th voltag is thn incrasd by adjusting th rhostat until th instrumnt indicats 0 C. Th bridg has now bn calibratd and tmpratur masurmnts may b mad by conncting th mbddd rsistanc coils into th circuit on at a tim by mans of a drum switch as shown in Fig. 3. Th Typ W slctor switch provids ovrlapping contacts up through trminal No. 10, thus prvnting th possibility of ovrloading th galvanomtr whn changing positions. Occasional inspction is ncssary to mak crtain th connctions ar tight and that th indicator is oprating. RENEWAL PARTS Ordr rnwal parts from th narst Wstinghous Offic. Includ a complt dscription of th part wantd along with th data on th namplat attachd to th transformr tank wall. Iff!} WESTINGHOUSE ELECTRIC CORPORATION \'tfj SHARON PLANT TRANSFORMER DIVISION SHARON, PA. Printd in U.S.A.

5 + DC SOURCE --=-TN"' FIG. 1. TR I RESISTANCE- COl L I.L RECEIVING INSTALLATION OPERATION INSTRUCTIONS Wall Mountd CURRENT TRANSFORMER TEMPERATURE INDICATOR Hottst Spot Rsistanc Bridg Typ --OIL LEVEL HEATING CO IL Schmatic Diagram of Connctions. THE BRIDGE TYPE HOTTEST SPOT TEM PERATURE INDICATOR for switchboard mounting consists of a spcially dsignd galvanomtr, a rsistanc bridg, on lg of which is mbddd in a hating coil locatd in th top oil of th transformr, a currnt transformr, and an xtrnal trminal box. Th hating coil is connctd to th scondary of th currnt transformr. During normal opration currnt flows in th hating coil sction continuously so that th hottst spot tmpratur of th transformr winding may b found at any tim by turning th Typ W switch from off to th dsird position. This hottst spot indicator is dsignd for short priods of indication, but may b safly usd for continuous indication SUPERSEDES l.l BA Switchboard Indicating CURRENT TRANS. TERMINAL BLOCK RESISTANCE COIL HEATING COIL NOTE: --._ SOLID LINES INDICATE CONNECTIONS MADE OUTSIDE TRANSFORMER. FIG.. DASHED LINES INDICATE CONNECTIONS MADE INSIDE TRANSFORMER Front and Rar Connctions on Trminal Block. providing th tmpratur indication is rcognizd as bing l o to C high (th xact valu may b dtrmind by tst). Th addd tmpratur ris is du to th continuous flow of currnt in th rsistanc coil and th rsulting hating. If dsird, th tmpraturs of a numbr of transformrs can b rad on on instrumnt by using a multi-point switch at th switchboard. Fig. l shows a schmatic diagram of th arrangmnt of th quipmnt for rading th tmpratur of on winding. SHIPPING AND RECEIVING Th currnt transformr is usually shippd as part of th main transformr and is usually of th through typ which is slippd ovr th lowr nd OCTOBER, 1954

6 TEMPERATURE INDICATOR -- \ 60 SWITCHES SHOWN AS ARE PANEL MOUNTED RHEOSTAT. USE VIEWED ABOVE WITH FROM ONE USE TWO FOR ALL IN VOLTAGES ECEPT SERIES FOR 05 TO VOLTS. WHEN TWO ARE USED HANDLE END AT TOP, OF ONE PANEL, MAY BE MOUNTED IN BACK INDICATOR ETERNAL RESISTOR USED ABOVE 50 VOLTS.,t:----" '--...:>,--t':.-:=.-=.-=.., --A-IL::JL L-1 LEADS MAY H A V MA. RESISTANC[ OF 3, OHMS EACH. : ' ALL L-1 LEADS MUST BE l WITHIN 0.0 OHMS OF THE SAME RESISTANCE. : ' ALL L- LEADS MUST '--.;:--,c-:::-_.j BE OF NEGLIGIBLE \,' r---, RESISTANCE EACH LEAD ' ' ' NOT MORE THAN 1,;q{::f' c. : 0.0 OHMS, ---k ' r ;:;J. : _,(L- y SEE NOTE 1141 FIG. 3. of th bushing and mountd on th undr sid of th covr. Somtims it will b mountd on th top of th trminal board, bridgs, or nd frams. In this cas, a Micarta tub will probably b usd to conduct th currnt transformr lads to th trminal box. This tub will b installd in plac on th currnt transformr. If th main transformr is not shippd in its tank, th tub is slid down or rmovd and tid to th currnt transformr. Th xtrnal trminal box will always b in plac, and will b covrd by a wathrproof conduit box. It may b a box as shown in Fig. 5 or a larg box to tak car of a numbr of lads including som not for th hot spot indicator. Th hating coil and rsistanc lmnt form an intgral unit which is shippd in plac whnvr possibl. If this cannot b don, it is shippd in a sparat packag markd "Dtails". Th fixd rsistanc coils ar assmbld in th indicator for mounting on th switchboard. -LR ;11ER SUPPLIED ONLY WHEN POWER SUPPLY IS 10 V. 45 TO 64 CYCLES, Wiring Diagram for Tmpratur Indicator. SELECTOR SWITCH 5'* S'* S" POSITION TABULATION CONTACT POSITION OFF CAL I I INDICATES CONTACTS CLOSED IN POSITION SHOWN. NOTE: IF LESS THAN 6 RESISTANCE COILS ARE USED CONNECT THE BLANK STUDS TO ONE OF THE RESISTANCE COILS AS INDJCATED BY THE DOTTED JUMPERS, x-y CONNECT TO AND Y TO 14 OF SUCCESSIVE DRUM SWITCHES FOR MORE THAN 6 RESISTANCE COILS. OTHER CONNECTIONS SIMILAR TO THOSE SHOWN. Th drum switch and th rhostat ar shippd in a sparat packag markd "Dtails". Extrnal rsistors and/or rctifirs, if ordrd, will also b found in this packag. INSTALLATION A typical mthod of installing th hot spot indicator whn it is shippd sparatly is outlind blow. Always follow th instructions on th diagram, diagram namplat and outlin drawing for a particular installation. 1. Insrt th hating coil with its mbddd rsistanc through th propr hol in th wall and fastn scurly in plac. Th location of th hol is shown on th outlin drawing for th transformr. Z. Connct th two lads from th hating coil to th two studs markd 1 and 4 on th trminal block (on th insid of th transformr). S Fig Connct th two lads from th currnt transformr to th two studs 5 and 6, on th trwww. ElctricalPartManuals. com

7 TEMPERATURE INDICATOR I.L_._4_6-_7_17_-s_s PLAN VIEW OF ETERNAL TERMINAL BLOCK JUMPERS FOR SHORT CIRCUITING CURRENT TRANSFORMER (5-6) WHEN NOT IN USE. FIG. 4. I le 0 DEGREjES 5 CENTIGRADE I lim '\ Dial and Jumpr for Short Circuiting Currnt Transformr Whn Not in Us. minal block (on th insid of th transformr).. Th lads ar connctd to th propr trminals of th currnt transformr at th factory whn th trans-!--+-to CURR. TRANS - t --_;f lit-pi I' i. j, I ' b 0 j RESISTANCE COIL HEATING COIL WEATHER-PROOF COVER FOR TERMINAL BLOCK WEATHE R-PROOF CABLE AND FITTING FIG. 5. formr is tstd, and ths connctions should not b changd. 4. If a bushing-typ currnt transformr is usd, it is usually shippd mountd in plac undr th covr around on of th bushings. 5. Using th wathrproof cabl, connct th two lads from th rsistanc coil mbddd in th wll to th studs markd and 3 on th outsid of th xtrnal trminal block. 6. Mount th tmpratur indicator and rsistanc bridg on th switchboard and connct to th trminal box on th transformr as shown in Fig. 3 using (9700 C. M.) rubbr-insulatd wathrproof cabl, or largr. OPERATION Th currnt transformr is mountd insid th tank of th powr transformr, usually on a bushing. Its primary winding carris th main currnt of on of th transformr windings and its scondary winding dlivrs to th hating coil a rducd currnt which is at all tims proportional to th load currnt. Th insulation of th currnt transformr srvs to protct th hating coil and tmpratur indicating quipmnt from th high voltag of th main transformr windings. COVER AL LOW ABOUT 01N. LE AD FROM TERMINALS TO EN ABLE 0 TO BE LIFTED AND CONNEC TIONS MADE. Typical Installation with Bushing Currnt Transformr. BUSHING CURRENT TRANSFORMER LEADS ARE CONNECTE D TO PROPE R TAP AT THE FACTORY. OTHE R' TAPS ARE TAPE D.DO NOT CHANGE CONNECTION. 3

8 TEMPERATURE INDICATOR -- Th hating coil is placd in th hot top oil and its winding is workd at approximatly th sam currnt dnsity as th main transformr. In addition, th thrmal insulation of th hating coil is such that th lvation in tmpratur abov oil is th sam as that of th windings of th main transformr plus convntional l0 C hottst spot allowanc undr full load conditions. By ths mthods, th hottst spot tmpratur insid th transformr windings is duplicatd at th rsistanc coil which is mbddd insid th hating coil. Th rsistanc coil mbddd in th wll of th hating coil forms on arm of a Whatston Bridg, th othr thr arms bing mad up of fixd rsistancs. Th valus of ths ar so slctd that with th mbddd rsistanc at th tmpratur markd by th rd lin on th instrumnt dial, th bridg is balancd; that is, no currnt flows through th galvanomtr whn a dirct-currnt voltag is applid btwn points WBl and (s Fig. 1). Th instrumnt should thrfor rad this valu whn disconnctd from th circuit. Any variation in th tmpratur of th mbddd rsistanc changs its rsistanc thus causing an unbalanc in th bridg and a currnt will flow through th galvanomtr. Thr is a dfinit rlation btwn this currnt and th tmpratur of th rsistanc coil making it possibl to calibrat th galvanomtr scal to rad dirctly in dgrs cntigrad. Th instrumnt, which may b ithr indicating or a graphic rcording typ, is arrangd for switchboard mounting. Th rsistanc coil in th tank lmnt is usually sparatd from th fixd rsistancs of th bridg by long lads. Ordinarily, th d- sourc for dflction of th galvanomtr would b applid to WBl and WB, but bcaus of th xtnsion of bridg lg WB-WB4 to -3, this voltag is applid at point and through a sris rsistanc at WBL This balancs th lads and has th sam nt ffct as th usual application of th d- sourc in a Whatston Bridg. It dos not, howvr, corrct for drop in currnt through th bridg du to th addd rsistanc. This is accomplishd by incrasing th voltag applid to th bridg. Th corrct voltag to apply is dtrmind by mans of th Tst Rsistor and th adjusting rhostat. Th tst rsistor has a fixd rsistanc of ohms which is th rsistanc th rsistanc coil would hav at 0 C. Conncting th tst rsistor across th opn lg of th bridg would caus th instrumnt to indicat ooc providd th voltag was right and thr was no unbalanc du to lad rsistanc. Th lad rsistancs ar balancd out by conncting on nd of th tst rsistor to point by lad -TRl having th sam rsistanc as -WB. Th voltag is thn incrasd by adjusting th rhostat until th instrumnt indicats 0 C. Th bridg has now bn calibratd and tmpratur masurmnts may b mad by conncting th mbddd rsistanc coils into th circuit on at a tim by mans of a drum switch as shown in Fig. 3. Th Typ W slctor switch provids ovrlapping contacts up through trminal No. 10, thus prvnting th possibility of ovrloading th galvanomtr whn changing positions. Occasional inspction is ncssary to mak crtain th connctions ar tight and that th indicator is oprating. RENEWAL PARTS Ordr rnwal parts from th narst Wstinghous Offic. Includ a complt dscription of th part wantd along with th data on th namplat attachd to th transformr tank wall. 'W} WESTIN GHOUSE ELECTRIC CORPORATION \l1j SHARON PLANT TRANSFORMER DIVISION SHARON, PA. (Rp. 1-58) Printd in U.S.A. -