Anti-interference Dielectric Loss Tester
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1. Application Features and Performance
Used for on-site anti-interference dielectric loss measurement, or laboratory precision dielectric loss measurement. The instrument is an integrated structure, built-in dielectric loss bridge, variable frequency power supply, test transformer and standard capacitor, etc. It adopts variable frequency anti-interference and Fourier transform digital filtering technology, fully automatic intelligent measurement,
The measurement data is very stable under strong interference. The measurement results are displayed on a large screen LCD, and a built-in micro printer can print out.
Main technical indicators
Anti-interference index: variable frequency anti-interference, can still achieve the above accuracy under 200% interference
Capacitance range: Internal high voltage: 3pF～60000pF/10kV 60pF～1μF/0.5kV
External high voltage: 3pF～1.5μF/10kV 60pF～30μF/0.5kV
Resolution: high 0.001pF, 4 significant digits
Range: unlimited, resolution 0.001%, automatic identification of capacitance, inductance, resistance three types of test objects.
Test current range: 10μA～5A
Internal high voltage: Set voltage range: 0.5～10kV
Maximum output current: 200mA
Voltage rise/fall method: continuous smooth adjustment
Voltage accuracy: ±(1.5%×reading+10V)
Voltage resolution: 1V
Test frequency: 45, 50, 55, 60, 65Hz single frequency
45/55Hz, 55/65Hz, 47.5/52.5Hz automatic dual frequency conversion
Frequency accuracy: ±0.01Hz
External high voltage: Maximum test current 1A for positive connection, power frequency or variable frequency 40-70Hz
Maximum test current 10kV/1A for reverse connection, power frequency or variable frequency 40-70Hz
CVT self-excitation method low voltage output: output voltage 3～50V, output current 3～30A
Measurement time: about 40s, depending on measurement method
Input power: 180V～270VAC, 50Hz/60Hz±1%, mains or generator power supply
Computer interface: standard RS232 interface
Printer: Weihuang A7 thermal micro printer
Ambient temperature: -10℃～50℃
Relative humidity: <90%
1.2 Main Functional Features
1.2.1 Variable frequency anti-interference
Adopting variable frequency anti-interference technology, it can accurately measure under 200% interference, the test data is stable, suitable for on-site anti-interference dielectric loss tests.
1.2.2 High-precision measurement
Using digital waveform analysis and bridge self-calibration technology, combined with high-precision three-terminal standard capacitor, to achieve high-precision dielectric loss measurement.
All ranges of the instrument have input resistance less than 2Ω, eliminating the influence of additional capacitance of the test cable.
1.2.3 Multi-level safety protection to ensure personal and equipment safety
High voltage protection: In case of short circuit, breakdown or high voltage current fluctuation of the test object, the output can be cut off at high speed in a short circuit manner.
Low voltage protection: Misconnection of 380V, power fluctuation or sudden power failure, start protection, will not cause overvoltage.
Ground protection: When the instrument is poorly grounded and the shell carries dangerous voltage, the ground protection is activated.
C V T: Four protection limits for high voltage and current, low voltage and current, will not damage the equipment; wrong menu selection will not output excitation voltage. No 10kV high voltage output during CVT measurement.
Anti-misoperation: two-level power switch; real-time monitoring of voltage and current; multiple key confirmations; clear distinction between high and low voltage terminals; slow voltage rise, quick voltage reduction, audible and visual alarm.
Anti-"capacitive rise": When measuring large-capacity test objects, the "capacitive rise" effect of voltage rise may occur. The instrument can automatically track the output voltage to keep the test voltage constant.
Anti-vibration performance: The instrument adopts a unique anti-vibration design, can withstand strong long-distance transportation vibration and bumping without damage.
High voltage cable: It is a high-voltage resistant insulated wire, can be used on the ground.
1.2.4 Powerful functions, product serialization
The model of this instrument: F type, specific functions are as follows:
(1) It has positive/reverse connection, internal/external standard capacitor, internal/external high voltage multiple working modes, integrated structure, can do various conventional dielectric loss tests, no need to connect any auxiliary equipment.
(2) LCD display, menu operation, rich test data, automatic identification of capacitance, inductance, resistance type test objects, built-in micro printer can print output.
(3) It has an external standard capacitor interface, can connect an external oil cup for precision insulating oil dielectric loss test, can connect external solid material measuring electrode for precision insulating material dielectric loss test, and can also connect an external high voltage standard capacitor for high voltage dielectric loss test.
(4) Automatically identify 50Hz / 60Hz system power supply, and support generator power supply, even if the frequency fluctuates greatly, it can measure normally.
(5) Built-in series and parallel two dielectric loss measurement models, convenient for instrument calibration.
(6) Can store 255 sets of measurement data.
(7) When measuring by CVT self-excitation method, C1/C2 can be measured at one time with one wiring, automatically compensate the influence of bus grounding and standard capacitor voltage division, no need to change wires or connect any accessories.
(8) Chinese graphic menu, large screen backlight LCD display is clearer, current and voltage real-time monitoring.
(9) Optimized circuit design makes the accuracy and stability of positive/reverse connection *.
(10) Automatically identify external high voltage test power supply frequency 40Hz～70Hz, support power frequency power supply, variable frequency power supply and series resonance power supply for large capacity high voltage dielectric loss test.
(11) It has reverse connection low voltage shielding function. Under the condition of 220kVCVT bus grounding, C11 can be measured by 10kV reverse connection dielectric loss without disassembling the wire.
(12) With computer interface. Through this interface, measurement, data processing and report output can be realized, and the internal measurement software of the instrument can also be upgraded. It can be integrated into the comprehensive high voltage test vehicle.
(13) Configured with thermal printer, making printing faster, noiseless and clear.
(14) Add loop poor contact discharge prompt function to facilitate judging whether the wiring is reliable.
(15) Enhanced reverse connection low voltage shielding function, can measure the capacitance and dielectric loss value of two capacitors at one time with one wiring.
(16) Add CVT ratio function, can measure CVT ratio and phase error.
1.3 Scope of supply
(1) Instrument host (2) Instruction manual and product certificate
(3) Special test cable (4) Power cord
(5) Spare printing paper and fuse tube (6) Others see the "Packing List"
2. Panel description
2.1 High voltage output socket (0.5～10kV, max 200mA)
Installation position: front side of the box, with protective door outside.
Function: internal high voltage output; detect reverse connection test object current; high voltage terminal of internal standard capacitor.
Wiring method: socket pin 1 connects to high voltage wire core (red clip), pins 2 and 3 connect to high voltage wire shield (black clip). For positive connection, both the high voltage wire core (red clip) and shield (black clip) can be used as voltage application wire; for reverse connection, only the core wire can be used to apply voltage to the high voltage terminal of the test object.
If the high voltage terminal of the test object has a shielding electrode (such as a shielding ring at the high voltage terminal), it can be connected to the high voltage shield; if there is no shield, the high voltage shield is left floating.
Note: The above information and technical parameters are compiled and released by Yangzhou Darui Electric Co., Ltd.
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