Fully Automatic Four-Channel Dielectric Loss Tester
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Technical Parameters:
1. High voltage output: 0.5 ~10kV, each step increases by 500V, total 20 steps
High voltage output cable, can be used on the ground
Three frequencies: 45Hz, 50Hz, 55Hz
2. Capacity: 1500VA
3. Accuracy: tgδ: ±(reading*1.0%+0.08%)
Cx: ±(reading*1.5%+5PF)
4. Resolution: tgδ:0.01% Cx:1pF
5. Measurement range: 0.1% < tgδ < 50%
3PF< Cx < 60000PF
At 10KV, Cx ≤30000PF
At 5KV, Cx ≤60000PF
6. Power supply: AC 220V士10% 50士1Hz
7. Harmonic adaptation: ≤3%
8. Operating conditions: -15℃-50℃ relative humidity <80%
9. Dimensions: 460(L)×335(W)×340(H)
10. Weight: 30 kg
Safety Measures:
(1) High voltage protection: In case of short circuit, breakdown, or high voltage current fluctuation of the test object, the high voltage output can be quickly cut off.
(2) CVT protection: Set the overcurrent point of the self-excitation voltage. Once the set current value is exceeded, the instrument automatically exits the measurement without damaging the equipment.
(3) Ground detection: The instrument has a ground detection function. If not grounded, the voltage cannot be increased for measurement.
(4) Anti-misoperation: Designed with anti-misoperation features, it can identify common wiring errors and provide safety alarms.
(5) Anti-"capacitive rise": When measuring large-capacity test objects, the "capacitive rise" effect may cause voltage increase. The instrument can automatically track the output voltage to maintain a constant test voltage.
Working Principle:
The instrument's measurement circuit includes a standard circuit and a test circuit.
The standard circuit consists of a built-in high-stability standard capacitor and a standard resistor network. The computer collects the standard circuit current and the test circuit current amplitude and phase difference in real time, and calculates the capacitance value (Cx) and dielectric loss (tgδ) of the test object.
Using variable frequency power supply technology, it utilizes microcontrollers and electronic technology for automatic frequency conversion, A/D conversion, and data processing, achieving strong anti-interference capability, fast test speed, high accuracy, and easy operation.
Using a high-power switching power supply, it outputs 45Hz and 55Hz pure sine waves, automatically increases voltage, and can provide up to 10kV voltage; it automatically filters out 50Hz interference, suitable for on-site testing in environments with high electromagnetic interference such as substations.
Precautions:
1. Only use on de-energized equipment; other equipment can remain energized.
2. The instrument has a built-in voltage boosting device. Pay attention to the insulation of the high-voltage lead and personnel safety.
3. The instrument should be reliably grounded.
4. Before using this instrument to test equipment, perform insulation testing on the equipment first.
5. Determine the voltage withstand level of the equipment and correctly select the instrument's voltage boosting level to prevent breakdown of the equipment and damage to the instrument.
6. Although the dedicated high-voltage cable provided with the instrument has passed factory inspection, it should still be kept away from the human body and low-voltage test leads during measurement.
7. The input voltage is AC220V±10%. Exceeding this range may affect test accuracy; the maximum input voltage is AC264V. Exceeding this value will cause permanent damage, and the manufacturer will not provide warranty for such damage.
8. The printer may experience paper jams due to loose paper rolls during transportation. In this case, simply remove the paper roll, tighten it, and reinstall it.
9. The instrument should be protected from moisture and severe vibration.
10. When powered by a generator, the output neutral line should be grounded; otherwise, a grounding error will be indicated.
Instrument Structure:
Measurement circuit: Performs all calculations such as Fourier transform, complex number operations, range switching, and variable frequency power supply control.
Control panel: Printer, keyboard, display, and communication relay.
Variable frequency power supply: Uses SPWM switching circuit to generate high-power sine wave stabilized output.
Step-up transformer: Boosts the variable frequency power supply output to the measurement voltage, with maximum reactive power output of 2KVA/1 minute.
Standard capacitor: Internal Cn, measurement reference.
Cn current detection: Used to detect the current of the internal standard capacitor, 10μA~1A. Input resistance <2Ω.
Cx positive wiring current detection: Only used for positive wiring measurement, 10μA~1A. Input resistance <2Ω.
Cx reverse wiring current detection: Only used for reverse wiring measurement, 10μA~1A. Input resistance <2Ω.
Reverse wiring digital isolation communication: Uses a precision MPPM digital modem to transmit the reverse wiring current signal
Note: The above information and technical parameters are compiled and published by Yangzhou Darui Electric Co., Ltd.
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