Four-Channel Partial Discharge Tester - Yangzhou Dary
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The portable four-channel partial discharge inspection instrument is designed and produced by our company's technical personnel based on years of experience in partial discharge detection of high-voltage electrical equipment. It is suitable for live partial discharge inspection of high-voltage electrical equipment such as transformers, GIS, switchgear, cables, arresters, and instrument transformers.
The portable four-channel partial discharge inspection instrument consists of a 4-channel portable inspection test host, partial discharge inspection software, high-frequency current transformers (open circular transformers), ultrasonic sensors, ultra-high frequency sensors, TEV sensors, calibration pulse generators, coaxial cables, etc.
2. Main Features of the Product
1. Strong anti-interference capability and accurate detection data
Using digital filtering technology, it can effectively eliminate on-site interference and achieve partial discharge measurement even in strong interference environments.
2. High-sensitivity sensors that can sensitively reflect the partial discharge state inside the equipment
Using broadband partial discharge ultra-high frequency sensors, the detection frequency band can cover 300MHz-1.5GHz (any frequency band optional), effectively collecting partial discharge signals inside GIS equipment.
The ultrasonic sensor adopts advanced technology currently available, and practical application verification shows that it can detect weak discharge signals, ensuring effective detection of partial discharge signals inside high-voltage equipment.
The TEV sensor uses polytetrafluoroethylene material with good dielectric constant at the contact part with the switchgear cabinet, with built-in receiving electrodes, forming a capacitance with the cabinet wall, coupling the discharge signals inside the cabinet to the sensor for signal processing, ensuring effective detection of partial discharge signals inside the switchgear.
The high-frequency current transformer adopts the active zero-flux design principle, which not only meets the acquisition of mA current signals but also has strong anti-interference capability.
3. Simple and convenient installation
The contact ultrasonic sensor can be directly attached to the outer wall of high-voltage equipment, making operation simple and safe.
The high-frequency current transformer has a circular open design, making it easy to clamp onto different grounding wires.
4. Simple and convenient connection
The system adopts multiple connection methods, with BNC, SMA interfaces, and optical fiber between sensors and the host, for ease of use.
5. Built-in large-capacity lithium battery for long endurance
This device has two power supply modes: battery and external power supply. Using battery power allows convenient inspection of high-voltage equipment over a wide range, with continuous working time of no less than 4 hours; for long-term continuous use, simply provide AC220V±10% AC power.
3. Technical Indicators
3.1 Applicable Scope
It has the function of live partial discharge inspection of high-voltage electrical equipment in operation, suitable for live partial discharge inspection of high-voltage electrical equipment such as transformers, GIS, switchgear, cables, etc..
3.2 Product Technical Specifications and Standards
1) IEC60270 "Partial Discharge Measurements"
2) GB/T7354 "Partial Discharge Measurements"
3.3 Operating Environment
1) Ambient temperature: -10℃ to 50℃
2) Relative humidity: ≤95%.
3) Altitude: ≤1000m
3.4 Host Technical Parameters
Measurement channels: 4 independent measurement channels, each channel supports optical and electrical dual input modes
Sampling accuracy: 12Bit
Sampling rate: 60MHz per channel
Detection sensitivity: 1pC
Measurement range: 1pC～100nC
Nonlinear error of this range: ≤±5%
Capacitance range of test object: 6pF～250μF
Voltage surge withstand capability: 2500V, signal port end, power end, to ground (positive, negative)
Charging power: AC220V±10%; frequency 50Hz; power <50W
Built-in rechargeable battery: continuous operation for more than 4 hours
3.5 Sensor Technical Parameters
3.5.1 Ultra-High Frequency Sensor
Detection frequency band 300MHz～1.5GHz
Signal transmission method 50Ω coaxial cable
Detection sensitivity 1dB
Gain ＞65dbm
3.5.2 Contact Ultrasonic Sensor
Detection frequency band 20kHz～120kHz
Signal transmission method 50Ω coaxial cable
Effective sensitivity 10pC
3.5.3 High-Frequency Current Transformer
Detection frequency band 10kHz～30MHz
Signal transmission method 50Ω coaxial cable
Detection sensitivity 10pC
3.5.4 TEV Sensor
Measurement signals Ultrasonic signals, electrical signals
Ultrasonic measurement frequency band 20kHz～120kHz (center frequency 40kHz)
TEV measurement frequency band 10MHz-100MHz
Note: The above information and technical parameters are compiled and released by Yangzhou Dary Electric Co., Ltd.!
