PDL6500 Transformer Acoustic and Electrical Partial Discharge Detection and Location System
1. Company Profile
Beijing Huadian Zhicheng Electrical Equipment Co., Ltd. was established in 2014. It is a high-tech enterprise engaged in the research and development, promotion and technical consulting services of high-voltage electrical equipment status detection technology. It is committed to solving the "technical problems of power grid equipment status monitoring" to "escort" the safe operation of power equipment. At the same time, relying on the high-level team and technical advantages of the Beijing Key Laboratory of High Voltage and Electromagnetic Compatibility of North China Electric Power University, it is committed to transforming the laboratory's achievements into industry-university-research.
2. System Introduction
PDL6500 is an acoustic-electric combined partial discharge multi-terminal synchronous detection and positioning device independently developed by Beijing Huadian Zhicheng Electric Equipment Co., Ltd. for transformer defects. The system consists of two terminals, master and slave, a satellite synchronous timing module and intelligent analysis software. The product has the technical characteristics of high sensitivity, wide frequency domain, internal and external discharge identification and three-dimensional spatial positioning. It can accurately identify the internal discharge defects of the transformer and accurately locate them in three dimensions under complex interference environments on site.
3. Full-area internal and external signal identification and electrical positioning technology
Multi-point satellite synchronous timing, multi-channel synchronous monitoring, high-resolution acquisition to restore the original waveform, dual-processor hardware support powerful positioning algorithm, accurately realize the identification of internal and external discharge of the transformer and the electrical positioning of internal defects.
4. Accurate three-dimensional spatial positioning
By combining simulation and experiment, a three-dimensional acoustic propagation model of the transformer with known key structural parameters is established, and the theoretical electroacoustic time difference from the sound source point of any window pane to the sensor to be tested is solved. An a priori time difference database is established, and the a priori time delay and measured time delay of all sensors are combined. Based on the principle of minimizing the mean square error, the most probable position of the signal radiation source is found.
5. Accurate identification of discharge defect types
Taking into full consideration the typical defect modes inside the transformer, a rich expert sample library was built by combining laboratory and field data, and a variety of pattern recognition methods were used for hierarchical identification and comprehensive diagnosis to continuously optimize the recognition accuracy of discharge types.
6. Superb system performance
| name |
Parameters |
| Number of channels |
HF four channels, AE eight channels |
| Detection frequency band |
HF：100KHz～100MHz，AE：80KHz～200KHz |
| Sensitivity |
≤5pC (Laboratory) |
| Sampling rate |
HF：100MSa/s，AE：1 MSa/s |
| Dynamic Range |
≥60dB |
| Smart Diagnosis |
Internal and external signal discrimination accuracy>90%, type recognition accuracy>80% |
| Positioning accuracy |
Acoustic and electric combined three-dimensional spatial positioning accuracy ≤ 20cm |
| Anti-interference |
Multi-band filtering technology |
| Single channel multi-source separation technology |
| Multi-channel comparative analysis technology |
| Synchronous mode |
Internal synchronization: 50Hz
External synchronization: 10~1000Hz |
| Spectrum |
PRPD, PRPS, electrical positioning diagram, three-dimensional spatial positioning diagram, time-frequency spectrum, etc. |
| Communication |
Optical fiber, network cable |
| EMC level |
GB17626, Level 4 |
| sensor |
HF: transmission impedance ≥ 15mV/mA, AE: peak sensitivity ≥ 60dB (V/(m/s) |
