Partial discharge serves as an early indicator of insulation degradation in high-voltage electrical equipment. Industry statistics show that approximately 80% of high-voltage equipment failures can be detected through partial discharge monitoring, allowing potential risks to be identified 3–6 months in advance. Traditional partial discharge detection typically requires multiple instruments working together, featuring complex wiring and low efficiency. The portable handheld partial discharge tester integrates multiple detection functions into its design, enabling comprehensive testing without external auxiliary equipment. This article analyzes the device from perspectives of technical specifications, functional design, and field application, providing valuable reference for power operation, maintenance, and testing personnel.
The device features an intelligent controller as its core control unit, equipped with a 4.0-inch RGB LCD display boasting an 800×480 resolution and a graphical user interface that simplifies parameter configuration and testing procedures. With its lightweight design, it achieves a leading level of portability among comparable products, making it ideal for mobile operations in various settings such as laboratories and substation sites.
In terms of storage capacity, it can store 1,000 sets of test data without loss after power failure and supports data export. After reading via a standard PC, a detection report can be generated, meeting the requirements for paperless recording and archive management. The device is manufactured in China's Hubei Province and comes with a 2-year warranty. It also offers OBM, ODM, and OEM customization services to accommodate the personalized needs of different users.
Power supply: AC 220V, total power consumption ≤1000W, equipped with a built-in 3.7V/5000mAh lithium battery that provides approximately 6 hours of continuous operation without external power. The charger supports AC 90–264V or DC 5V input.
Sensor Compatibility: Supports integration of various detection sensors including transient ground voltage, ultrasonic, and ultra-high frequency sensors.
The long-range battery design with built-in lithium-ion cells holds practical significance for partial discharge detection in remote areas without power supply cables or substations. The wide-range charger input supports power supply standards across global regions, eliminating the need for additional power adapters and simplifying on-site operational configurations.
The detection accuracy specification ranges from ±0.1% to ±0.5% across the full measurement range, representing a high-precision class that falls within the leading engineering standard for partial discharge testers. For most high-voltage equipment partial discharge inspections, this accuracy is sufficient to determine whether the discharge magnitude and trend comply with requirements specified in standards such as GB7354.
The device automatically generates various analytical results, including PRPD phase-resolved spectra and PRPS pulse sequence spectra, reducing subjective variations in manual interpretation. It also automatically identifies different types of discharge defects, providing a basis for diagnosing insulation faults.
multimodal detection simultaneously covers various detection dimensions such as transient ground voltage and ultrasonic signals, facilitating the identification of early insulation defects within equipment. The combination of different detection modes effectively distinguishes between field interference signals and genuine partial discharge signals, thereby preventing potential oversight due to misinterpretation caused by a single detection method.
Phase measurement accuracy: 0.5°
Phase resolution: 0.1°
Phase resolution serves as the core indicator for identifying local discharge types. With a phase measurement accuracy of 0.5°, it can precisely capture the distribution characteristics of discharge pulses within the power frequency cycle, providing critical reference value for distinguishing interference signals from genuine partial discharge signals in field applications and serving as an additional criterion for discharge type determination.
Standard partial discharge detection range:
Discharge range: 50°C to 100,000°C
Detection accuracy: ±0.1% to ±0.5% across the full range
This scope covers common partial discharge detection requirements ranging from low-voltage switchgear to ultra-high-voltage GIS equipment. For partial discharge detection of 500 kV-class equipment, the device meets the on-site rapid verification requirements.
UHF detection range:
Frequency range: 1–30 MHz
Detection accuracy: ±1 dB
Note that the 1–30 MHz range mentioned here refers to the characteristic detection frequency band for partial discharge signals, rather than directly receiving undifferentiated signals across the entire frequency spectrum. During actual detection, digital filtering technology is employed to eliminate on-site interference signals and extract effective partial discharge characteristics, thereby enhancing detection reliability in strong electromagnetic environments.
The device complies with the requirements of standards such as GB7354 (Partial Discharge Measurement) and DL/T1416 (Ultrasonic Partial Discharge Detection), with an IP55 protection rating, enabling normal operation in conventional substations and distribution rooms. In areas above 1,000 meters in altitude, attention should be paid to potential variations in ultrasonic signal attenuation and sensor sensitivity.
Based on the above parameters, the device is suitable for the following typical scenarios:
- Live-line inspection of high-voltage switchgear: Conduct rapid screening using TEV and ultrasonic technology to identify internal insulation defects.
- GIS equipment partial discharge detection: Identifies discharge defects inside enclosed equipment through ultra-high frequency testing.
- Periodic pre-test of transformers: Conduct partial discharge tests on oil-immersed transformers to assess the insulation condition of windings.
- Cable joint fault diagnosis: Use a high-frequency current sensor to detect partial discharge signals in the cable line and locate the fault point.
- Handover and acceptance of newly installed equipment: A test report shall be issued in accordance with relevant procedures and retained as part of the technical documentation.
The portable handheld partial discharge tester integrates multiple partial discharge detection modes into a single unit, featuring high-sensitivity detection and automatic discharge spectrum analysis capabilities. Its detection accuracy, measurement range, and environmental adaptability fully meet engineering-grade testing requirements. For technicians requiring frequent on-site partial discharge testing, this device provides a relatively comprehensive, portable, and nationally compliant testing solution. When selecting the model, it is recommended to comprehensively consider the type of equipment under test, voltage level, and on-site environmental conditions.
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