Soken DAC-HRE-1 - Hot Line Coil Resistance Measuring Equipment
DAC-HRE-1 is designed for temperature rise tests of motors, transformers, coils, and chokes under energizing AC voltage. The direct reading of resistance is possible with a 4-terminals measurement method, and the temperature is calculated from measured resistance values.
Test Specimen
Motors, Transformers, Coils, Chokes and etc.
Conversion to Temperature
A relationship between electrical resistance and temperature can be expressed as follows.
Rt = Rto { 1 + ato(t - to)}
Rt = Electrical Resistance at t˚C
at0 = Temperature Coefficient at t0˚C
Rt0 = Electrical Resistance at t0˚C
Using the above relationship, the temperature can be calculated from the difference in electrical resistance. Usually, 1/a0 = 234.5, where a0 is the temperature coefficient at 0ºC, is used for the conversion to temperature as described in the following formula.
tc = (Rt - Rt0 / Rto)(234+ t0) + t0
∆t = t0-tc
tc = Converted Temperature ( Tc)
∆t = Temperature Rise ( ∆T )
Rt = Measured Electrical Resistance ( R )
Rt0 = Initial Resistance ( R0 )
t0 = Initial Temperature ( T0 )
Temperature conversion of metal other than copper is also possible by changing the coefficient value.
Auto Calculation Sample Software
By using the Sofware, measured values are saved and displayed in an Excel sheet. Time Interval set-up is also possible through PC.
DC Blocking Capacitor Box
DC Blocking Capacitor must be required for measurement with DAC-HRE-1, so that testing current may not flow into the AC line.
An appropriate Capacitor must be selected in accordance with testing current, and inserted between the power supply and the specimen.
Optional Accessories
DC Cut Capacitor Box Model DAC-CHR-1B
DAC-CHR-1B is one of the option Capacitor Boxes which can use by simple connections. Select an appropriate capacitor range in accordance with the testing current.
- Built-in Capacitor: Electrolytic Capacitor
- Maximum-allowed-current value: 470μF... 2A, 4,700μF... 7A, 47,000μF... 23A (one-each built-in, with protection diode and arrestor)
- Size & weight: W210 x H133 x D160(mm) Approx. 3kg
Thermal Printer
It is possible to print out measured values and temperature conversion values by connecting the printer directly with DAC-HRE-1. Print-out every given time is available with an interval mode.
- Size & weight W93xH70xD125(mm) Approx. 265g
Voltage Adaptor Model DAC-HVA-3
By using the optional adaptor, measurement of test voltage at 450 VAC or more is available with Hot Line Measuring Instrument Model DAC-HRE-1/DAC-HRT-1.
- Max test voltage:700VAC (Sine Wave)
- Size & weight: W430 x H200 x D385(mm) Approx. 35kg
Connection Diagram
- Automatic Test with PC through RS 232C interface.
- Temperature rise test of electric coils under energizing AC Voltage Max 450V.(*) (*) AC Max 700V (sine wave) is available by using an optional adaptor.
- By using an optional thermal printer kit, print-out of measured values and temperature conversion values is possible. Also, print-out every given time is available with an interval mode.
- In accordance with JIS 5311: Testing methods of power transformers for electronic equipment.
General
| AC Voltmeter | 0-500V | ||||||
| Measuring Range | 2Ω range: 0 - 4.000Ω 20Ω range: 3.00 - 40.00Ω 200Ω range: 30.0 - 400.0Ω 2000Ω range: 300 - 4000Ω | ||||||
| Accuracy | ±(0.2%F.S. + 2 digits) | ||||||
| Applied Voltage | MAX 405V (50/60Hz) | ||||||
| Measuring Input Impedance | 200kΩ or more (50/60Hz) | ||||||
| Display |
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| Communication | RS-232C | ||||||
| Main Power Supply | AC100V-240V ±10% 50/60Hz | ||||||
| Dimensions | W430 x H150 x D385 mm | ||||||
| Weight | approx. 18kg | ||||||
| Option | •Thermal Printer •DC Blocking Capacitor (Various kinds) •Voltage Adaptor (DAC-HVA-3) | ||||||
| Related Standard | JIS 5311 |
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