Sketch
DRA-3000 Dielectric Frequency Response Analyzer (DFR) combines frequency domain and time domain testing methods, enabling users to conduct broadband measurements on equipment in a relatively short time, greatly reducing the workload of on-site testers and improving on-site work efficiency. The maximum DC output voltage of this product can reach 2kV, and the maximum AC output voltage can reach 500V (peak value). At the same time, it supports the PDC method and the FDS method, which can effectively detect the status of high-voltage insulation systems (such as power transformers, bushings, cables, and generators), and can automatically analyze them to determine the moisture content in the insulation materials. It uses a non-destructive method to evaluate the moisture condition of equipment, as an important basis for equipment replacement and other drying measures.
Main functional features:
1. It has three test channels, and each channel can be freely configured as a high-voltage output/low-voltage input according to the condition of the equipment under test.Both voltage and current can be measured through three channels, and the dielectric loss to ground of the high, medium, and low windings of the three transformer can be measured simultaneously.The combination of the time domain PDC method and the frequency domain FDS method can test the dielectric loss curve in the full frequency domain in a short time.
4. Automatically analyze the test curve, determine the moisture content of the insulation material, and evaluate the equipment's moisture exposure using a non-destructive method.
5. Powered by a 36V10Ah large capacity lithium battery, it does not require external power supply, has low power consumption, long standby time, and can be used portable.
6. The protection functions are complete, with protection functions such as overcurrent, short circuit, overheating, and cable falling off.
7. The host computer is connected to a handheld mobile terminal or notebook computer through wireless communication, achieving wireless intelligent control, and the testing process is safe and convenient.
8. Provide a client that supports Windows systems and APP software that supports Android terminals, and the two types of client data are compatible with each other.
9. Support hardware independent working mode. In the absence of APP software, you can manually start the device for testing and import test records to a USB flash drive.
Standards
1.GBT5654-2007"Relative Permittivity, Dielectric Loss Factor, and DC Resistivity of Liquid Insulating Materials"
2.GB/T 6587-2012 Measurement of " General Specification for Electronic Measuring Instruments
3.DL/T 962-2005 General Technical Conditions for High Voltage Dielectric Loss Tester
4.GB/T 14217-1993 Capacitor Paper Dielectric Loss Factor Determination method
5.DL/T 596-2005 Preventive Test Procedures for Electric Power Equipment
6.Q/CSG 114002-2011 Preventive Test Procedure for Electric Power Equipment
7.IEC 60422-2013 Mineral insulating oils in electrical equipment - Guidelines for supervision and maintenance.
Main technical parameter
| Main performance indicators |
| PDC output voltage |
Range:0~-2kV,continuous adjustable,waveform raple:≤2%,
accuracy:rated voltage ×2%±10V |
| PDC output current |
Range:0~100mA |
| FDS output voltage |
Amplitude:±500V(peak),frequency:0.1mHz~10kHz,
frequency accuracy:0.1% |
| FDS output current |
Amplitude:±100mA(peak) |
| Capacitance range |
1pF~500μF |
| Sampling voltage |
Range:±2kV,Resolution:0.1V,accuracy:range×2% |
| Samling current |
Range:2mA,20μA,200nA,2nA,Resolution:10μA,100nA,1nA,10pA,Accuracy:range ×2% |
| Functional parameters |
| Measurement mode |
PDC or FDS methods can be used alone, or combination of both measurement methods can be used simultaneously to obtain comprehensive analysis results |
| Measurement function |
Measurement at same time: ,amplitude of 1 to 3 channels of voltage/1 to 3 channels of current, phase, dielectric loss |
| Measurement method |
Off-line measurement |
| Wiring method |
GST or UST |
| Voltage output mode |
High voltage amplifier amplification output |
| Tablet PC interface |
WIFI |
| Computer interface |
RS232 or USB |
| Data storage |
Automatically store data, up to 100 sets of historical data can be stored |
| System protection |
With short circuit/overcurrent/overheating/battery over discharge/cable detachment protection function |
| Power/weight/dimention |
| Power supply |
Built-in lithium battery power supply, charger 42V/2A |
| Host Dimension |
405mm(L)×365mm(W)×192mm(H) |
| Host weight |
17kg |
Test principle
DRA-3000 dielectric response analyzer can use either the polarization depolarization PDC method or the frequency domain FDS method alone, or both methods can be used at the same time. The PDC curve can be converted into a low-frequency FDS curve through a unique algorithm, and the high-frequency measured FDS curve can form a full-range FDS curve. This allows users to measure the equipment in a relatively short time in a wide frequency range, greatly reducing the workload of on-site testing personnel and improving on-site work efficiency.
1.PDC method
Polarization-depolarization current (PDC)method is a time-domain measurement method for dielectric response. It uses the polarization characteristics of dielectric materials under DC voltage to obtain PDC curves, and studies the relationship between PDC curve changes and aging/water content. The principle of polarization/depolarization current method: When a DC voltage is applied to an insulating dielectric, polarization occurs inside the dielectric, and the internal dipoles are arranged in a directional manner to form a polarization current; After removing the DC voltage and shorting the two electrodes, the polarized charges gradually change from a directional arrangement to a disordered state, generating a depolarizing current.
2.FDS method
Frequency domain spectroscopy (FDS) method is to study the polarization characteristics of a medium in the frequency domain, also known as the frequency response method. By applying AC voltage signals of different frequencies to both ends of the insulating medium material, a responsive current signal is generated in the medium. The amplitude and phase of the responsive current signal are measured. Based on the relevant information of the voltage signal, information such as dielectric loss, complex capacitance, and complex dielectric constant of the insulating material is calculated. This information is closely related to the insulation state, and the insulation state can be effectively evaluated by using this information.
DRA-3000 Test Schematic Diagram
DRA-3000 integrates PDC and FDS methods, and three channels can be freely configured as high voltage output and low voltage input. Each channel can be measured independently.
Front panel :
1) LED battery power display;
2) LED status display running/charging/copying
3) Power on button;
4) Emergency stop button;
5) Start test/stop test button;
6) Click the data copy button to save test data
7) USB flash disk interface.
8) 3-channel CH1/CH2/CH3 interface.
9) 3-channel status high voltage output/low voltage input indicator.
10) Instrument ground terminal
Back panel:
1)Fan heat sink;
2)WIFI antenna interface
3)COM debugging interface
4)DC42V2A charging interface
Accessories
| Sr no |
Description |
Qty |
| 1 |
Host |
1 |
|
| 2 |
Tablet PC with app |
1 |
| 3 |
Antenna |
1 |
| 4 |
Charger for host |
1 |
| 5 |
Ground wire with clip |
1 |
| 6 |
Triaxial cable with clip |
1 |
| 7 |
Operating manual |
1 |
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