DIAL THERMOMETER FOR WINDING AND OIL page; 2 2 cae baa. aX aon il Temperature Indicator ‘Winding Temperature Indicator Oil Temperature Indicator (without cover) with two (without cover) with four micro- with four microswitches. microswitches. switches. OilTemperature Indicator, OTI Series 34 GENERAL The Oil Temperature Indicator Series 34 measures the top-oil temperature. It is a standard accessory for cooling, control and protection on all transformers. Winding Temperature Indicator, WTI Series 35 GENERAL The life of the transformer depends on the winding temperature because the winding temperature is determinating for the temperature and deterioration of the insulating material Due to the high electric potential of the winding, itis not practical to measure the winding temperature directly AB KIHLSTROMS MANOMETERFABRIK Flygftepatan 6 ¢ PHONE: +48 8931060 Suze30 SKARPNACK TELEFAX: 14886048910 DG NO, 14- / ‘SWEDEN TELEX: 17508 AKM S eSDIAL THERMOMETER FOR WINDING AND OIL Page :2 1. Oilfilled pocket 2. Capillary tubing 3. Heating element 4, Current transformer C.T. Alt. A 5. Matching unit AKM 44677 or AKM 44678 Alt. B 6, Matching resistance TD 76 or TD 50 (nw [= DWG NO, :14-16936 REV |DIAL THERMOMETER FOR WINDING AND OIL Pa°:3 By making a "Thermal Image" of the winding ‘our Winding Temperature Indicator, WTI- Series 35, simulates the winding temperature. ‘The WTI is basically an Oil Temperature Indicator, OTI Series 34, with a specially designed heating element connected to the current transformer (C.T.). For safe overloading of a transformer our WTI is a necessary protection device OPERATING PRINCIPLES Please refer to pictures of the operating principles on page 4. ‘The temperature of the winding depends on the transformer load, (ie. current through winding) and the temperature of the cooling medium - the ol These two parameters are measured and made to interact in the instrument. The oil temperature is measured as usual with a bulb in the pocket The measuring system also has a specially designed heating element, to measure the transformer load. This heating element is a thermal model of the winding. The heating element is. connected to the current transformer (CT) via a Matching Resistance TD76 or a Matching Unit. See Page 4. CALIBRATION Calibration is based on information (from heatrun test) about the gradient (difference between winding- and top oil temperature) and the corresponding output from the current transformer (CT) Graph TDS2 (see page 5) indicates the current required (!) through the heating element to give a corresponding gradient. The current, to the heating element, can then be calibrated either with Matching Resistance TD76 or Matching Unit to this, Value. Calibration is only necessary for one known relation between load and gradient TECHNICAL DATA GENERAL This product is designed for Power transformers. Its a special construction for long life, heavy duty and maintenance free control ofthe oll (OT) and winding- (WT) temperature. itis made for outdoor mounting directly on the transformer in any climate, tropical as well as arctical Al parts are made of non-corrosive or surface treated material. ‘A powerful measuring system secures the safe and accurate operation of the high Capacity contacts Besides the basic models, described in this bulletin, many accesoris are available. For example: “Transmitter for remote indication (see TD66 and T0114). “Earthquake-proof execution (see TD101). Extreme climate execution. _Pigtectve class IP 85 oF 85 ace to DIN or ‘SPECIFICATION Casing: Die casted aluminium with two-pack trethanebased primer, Clear transparent window of tough polycarbonate plastic. The case is ventilated ‘and weather proof according to DIN 40050 protective class IP 43, ‘Temperature sensing system: Of expansion type (no mercury) and compensated for ambient temperature changes. Capillary tubing: Of copper nickel avaiable with a protective tubing of stainless steel or Pvc: ‘Switches: Two up to five microswitches, terminal connected as twoway switches (open or close on temperature rise). Electrically separated circuits. Each switch has a dial for setting the contact temperature. Making and breaking capacity: 15 A, 250 V AC, see last page. Option: Switches with Magnetic Blow Out - MIB O type - with higher BC switching capacity, see last page. Insulation test: 2000 V 50 Hz to ground 60 s. Wiring diagram: See Instruction TD34 ‘Maximum indicating pointer: Resettable from outside with a screwdriver Instrument operating temperature: standard execution max.+70, min -40 °C. Anti-vibration mountings: Included Dimensions: See last page, DWG NO. :14-16937 REV 1DIAL THERMOMETER FOR WINDING AND OIL ,,,.., Winding Temperature Indicator WTI Series 35 Gradient at°c : S s 40 S \ \Y GRAPH TD52 Bulb in ol filled wel \\ Approximate temperature rise \Y 304 above oil temperature. w w \Y w x w 20: & § & w ws \ a w Imax = 2,3 A continuously w Inax= 10, 53 Thermal time constant (63,2% value) ca. 9 min, 08 1 15 2 1A) Gradientcalculation Conditions: Bulb type | "Kk" value Bulbtemperature 60 °C. 4142 (assumed same as top oil 15,18 20,5 temperature) i Ailreadings, with cover mounted | __ 16 23 and minimum 30 min. after 19 22.2 stabilized current value. * Where: dT = Kx F(Accuracy +5%) dT = Gradient (Winding-oil) °C. sonstant ace. to table. I= Current A to heating element (from C.T) Exampel: Calculate | for: bulbtype 12 and dT = 18°C. 18=20,5xI" 120,944 DWG NO. :14-16938 REV 1DIAL THERMOMETER FOR WINDING AND OIL ‘Type number specifyi Serial number 34 for ol temperature OT! Serial number 35* for winding tem»peratu Number of switches Measuring and switching range Bulbtype Accessories - if requested Capillary length in meters Sram | Serial number Two switches Measuring and switching range 01 Bulb type 15 ‘Accessories Capillary length 4,0 meters * Instrument with builtin thermal image. MEASURING RANGES Page :5 re WTI » Suitehing deren Meauringrange| Mesuringacauacy | Suteningrange| Switching acouracy © Sorc ar} o-ssre” | 220 so-rs0°e] 0-500 | sae sn-rs0%¢ | 5-108 oz | s0-1e0°¢ | £3°C nereen 30-1708] a0-170°¢ | 42°C nerneen @0-170°C | 6-110 3 | ao-as0e | tare sore] 70-2208 | 4500 ro-220%¢ | 5158 05 | -20-1a0ec | 380 zo-1a0°¢| -20-100° | 348 so-r0ee | 5-108 a6 | o-eore | 2380 so-re0rc] o-r00°c | 40 somra0°e | 510°C BULB TYPES we ‘imerson we Dimenion 10 Special 15 n anne 16 former} 2 18 13 19 a 4 Leet DNG NO. :14-16939 REV 1DIAL THERMOMETER FOR WINDING AND OIL Page :6 - 190 ~ 60-100 = 280 | J | Q oo} Lape FT Weight: 4g. N cobtagnds 4255-15 mm Al dmersone ae subject o change without noi. CONTACT RATING Breaking capacity ‘Switchtype | Rated voltageV | RatedcurrentA 7 Resistive load | Inductive load De 30 10 10 Standard switch 110 06 of 220 03 0,05 ac 110 15 15 220 15 18 M.B.0. switch | AC/DC 30 10 10 110 10 6 220 3 15 Service life: 500 000 operations minimum. ‘Ambient temperature range: - 40 to + 70°C. Note: 1. Inductive load means that power factor is 0,4 for AC and time constant LR = 7 ms max for DC. 2. M.B.O. = Magnetic Blow Out. AB KIHLSTROMS MANOMETERFABRIK Fiygfaltsgatan 6 C PHONE: +46 8 93 10 50 ' $128.30 SKARPNACK TELEFAX: +46 8 604 68 10 DWG NO. :14-16940 REVI ‘SWEDEN TELEX: 17508 AKMSDIAL THERMOMETER FOR WINDING AND OIL age 7 MANUAL/MANUEL ae OIL TEMPERATURE INDICATOR WINDING TEMPERATURE INDICATOR INDICATEUR DE TEMPERATURE INDICATEUR DE TEMPERATURE DE D’HUILE L’ENROULEMENT Series 34 Series 35 Q- DQ (itilti i ity Q Indicator Indicateur 61 62 Output ace. to TDs Emetteur selon TD66 oe HMR SEHD hs LH [ft 55 Micro switches “Thermal image" heating element Micro-rupteur Elément de chauffage pour "image thermique Options oe 8 5 5 Output ace. to TO11t “Thermal image" heating element with matching resistance TDS0/76 Elément de chauttage pour “image thermique” avec resistance incorporee TDSO/76 Emetteur selon TD111 DWG NO.: 14-16940-1 REV1