The embedded devices provide an additional rise in temperature due to potential hot spots occurring at the measurement location. For the winding exponent, the IEEE and IEC guides recommend for directed flow the use of m=1. motor at an elevated temperature. What does motor insulation class specify and why is it ... If the room ambient temperature is 40°C, then the total temperature of the hottest spot would be 220°C. The primary difference is the maximum allowable temperature at which the alternator windings can operate with these types of insulation, as shown in Table 1. There are a variety of winding temperature devices and systems all being designed to open the pilot circuit to the motor starter. US20090026894A1 - Robust stator winding temperature sensor ... Winding temperature thermometers work the same as the top oil thermometer, except that the bulb is in a separate thermometer well near the top of the tank. PDF Section 7: Stator Winding Sensors In operation, the RTD is usually wired into a specific type of circuit (wheatstone bridge). NEMA insulation classes for motors - Drives and Automation PDF Temperature Effects on Motor Performance From NEMA insulation class table above, this motor has maximum Temperature Rise of 105°C, adding this temperature to the ambient temperature of 40°C gives us 145°C. Thin-film elements are best In order for any electric motor to generate torque, current needs to be forced through the motor windings. The total temperature in both cases is limited to the same amount. How To Maintain And Inspection Motors . This hot spot area is located somewhere toward the top of the transformer, and not accessible for direct measurement with conventional methods. Dear sir,We are having a 6.6 KV, 2400 KW,992 RPM,HT amps 267 HT motor for our Vertical Raw mill.It is running at 2200 KW load.We are finding problem with Winding temperatures.the winding temperature of R phase is around 112-113 Deg.C,y phase winding temperature is also at 111-113 Deg.C.But B . body length and measures the average temperature of the winding. The following table summarizes the different insulation systems available. But even though, the motor winding temperature get increase due to falling of additional loads on the motor, insufficient cooling, some other faults . windings temperature allowable while the alternator is operating, if exceeded the insulation will breakdown resulting in winding burn out. In such cases, the winding temperature is usually around 5 to 10 C above the back-iron temperature. Winding Temperature Indicator or WTI This device measures the LV and HV winding temperature. A transformer having a specific class of insulation, for example Class 220, can have an average winding temperature rise of 150°C with a maximum hot spot temperature rise of 180°C. The bulb is connected to the Instrument housing by means of two flexible capillary tubes. The temperature measured in the windings is shown by . Winding Temperatures [Class H temperature rise rating of 125degC] + [allowance for local hotspot of 15degC] + Details of Winding Temperature Indicator(WTI): Classes B and F are the most common in many applications. Winding Temperature for Motor-Driven Air Compressor. Further, winding life can be halved if the High temperature on the transformer windings. If the transformer is measured without oil, the winding temperature is normally assumed the same temperature as the surround air. The sensor also includes a body, including a core material surrounding at least a portion of the sensing wire coil, and a laminate material over the core material. The insulation rating is the maximum allowable winding (hot spot) temperature of a transformer operating at an ambient temperature of 40°C. The bulb is also heated by central heater. Winding Temperatures [Class H temperature rise rating of 125degC] + [allowance for local hotspot of 15degC] + RTDs (Resistance Temperature Detectors) are precision, wire-wound resistors with a known temperature resistance characteristic. The measured resistance should be corrected to a common temperature such as 75°C or 85°C using the following formula: where: R C is the corrected resistance; R M is the measured resistance Further, winding life can be halved if the There may be other hot spot temperatures, but these are . Transformer winding temperature is measured indirectly unless your transformer has fiber optic sensors . Normal load in plant is 93A. The temperature-rise data of the motor, where provided, are an indication of the average winding temperature rise above the ambient motor temperature. Therefore for the control of the temperature parameter within the transformer, the temperature of the winding, as well as top oil, is measured. All large transformers have an oil or a winding temperature indicating device of some type, and most have temperature recorders as well. Switched reluctance machines are . In a low voltage secon-dary, 1.5 turns may be required for optimum balance between core and winding losses. In addition to traditional winding temperature indicators, the winding temperature can also be measured using a resistance temperature device (RTD) or through fiber optic winding temperature sensors. Please note that the normal transformer is rated for 65°C inner sides and 22°C overall. For example, if the motor that was reported to be "running hot" has a 1.15 service factor, its maximum temperature rise would be 115 C plus the 40 C ambient. A winding temperature indicator or WTI is also used as protection of transformer. However the temperature of the winding is not uniform and the real limiting factor is actually the hottest section of the winding commonly called winding hot spot. The WTI means winding temperature Indicator and OTI means Oil Temperature Indicator which indicates the winding temperature & oil temperature of the transformer and operates the alarm, trip, and cooler control contacts.This instrument operates on the principle of thermal imaging and it is not an actual measurement.. 3.Temperature Sensitive Devices-since temperature is the limiting factor in protecting a motor, a direct sensing of motor winding temperature is the logical approach. Copper is an excellent conductor, Motor winding temperature high: This is very rare fault, because of all the motors are designed to operate at continuously typically S1 & S2 duty.This is depending upon the insulation class and the number of starting and number of operating hours. There are four insulation classes in use namely: A, B, F, and H. All four classes identify the allowable temperature rise from an ambient temperature of 40° C (104° F). As the winding temperature inside the motor can not be measured directly, measure the surface temperature of the motor case as a reference. This motor winding temperature is communicated to DCS and temperature is logged in the DCS. Insulation systems are classified by the temperature rating. Now we have to disable RTD#4 (faulty) to run the motor. 1 - What is typical rise of stator winding temperature by RTD above average winding temperature (by resistance method)? 2.The heat given to the bulb is a function of load current as well as temperature of oil near winding. In a motor, this would include ground insulation, magnet wire, varnish, lead wire insulation, tapes, strings . With one turn, the flux swing and core loss may be much too large; with two turns the winding loss becomes too great. The following table summarizes the different insulation systems available. However the temperature of the winding is not uniform and the real limiting factor is actually the hottest section of the winding commonly called winding hot spot. 2 - Your opinion on a specific case: We have 800 hp 900rpm 60hz vertical squirrel cage motor. Humid? The allowable temperature rise is made up of two parts: the maximum temperature rise for the insulation class plus a hot-spot over temperature allowance. At test conditions, with water circulating by the motor at 1 ft/sec, submersible motors typically have rises of 50 to 100°F (10 to 38°C). achieve because the number of turns in each winding must be an integral number. Advanced Energy pioneered the field of fiber optic winding temperature measurement more than 40 years ago and is a ; Calculation of winding temperature at the end of temperature rise test of transformer. - If environment is wet/humid, results may be skewed - Schedule tests around weather - Enter environmental conditions on Motor Testing Record sheet When the RTD measured temperature reaches a set limit there will be an alarm. Hottest Spot Winding temperature: There is only one winding hottest spot temperature in any transformer. Top oil generally carries the highest temperature profile in the transformer other than measuring the direct winding for temperature hot spots. The resistance of the motor winding can then be determined from measurements of the direct current component and the . Motor Thermal Protection Keb. This is done by introducing a small direct current component into the motor current, which can be done by connecting an asymmetric resistance device in the motor circuit. 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