**Product Introduction: Handheld Capacitive Current Tester**
In China's power systems, ungrounded neutral points are common. Single-phase ground faults generate capacitive currents from line-to-ground capacitance, often causing arcing that leads to system failures. Regulations require arc suppression coils when capacitive currents exceed 30A (10kV) or 10A (35kV), necessitating accurate measurement. Additionally, stray capacitance combined with PT parameters may trigger dangerous ferroresonance overvoltages, requiring precise capacitance measurement for risk assessment.
Traditional methods (e.g., direct single-phase grounding, external capacitance injection) involve high-risk operations on primary equipment, with complex procedures and low efficiency. Modern PT secondary-side signal injection avoids these risks by applying low-level out-of-band signals to the PT open delta terminals, eliminating interference with protection systems or PT operations while bypassing 50Hz noise. However, existing instruments are bulky and inconvenient for fieldwork.
Our company has developed a new generation of handheld capacitive current testers, miniaturized through advanced design. Key features include:
- **Compact & Portable**: Redesigned hardware with ARM processor and high-speed ADC reduces size/weight for easier field use.
- **Efficient Measurement**: Integrated digital frequency conversion inverter combines dual-frequency signals into one waveform; Fourier analysis extracts amplitude/phase data in a single test, improving efficiency.
- **Enhanced Accuracy**: New algorithms address measurement errors in 4PT configurations, ensuring precision.
- **Safe & Non-Intrusive**: No direct connection to primary equipment; signals injected via PT open delta terminals ensure safety and compliance.
This tester solves limitations of traditional methods, offering safer, faster, and more reliable capacitance and current measurements for modern power systems.
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**Key Improvements Over Previous Models:**
- Smaller size and lighter weight for portability.
- All-digital variable-frequency power supply and optimized signal processing.
- Simultaneous dual-frequency analysis for one-step measurement.
- Specialized algorithms for 4PT configuration accuracy.
Ideal for routine maintenance and fault diagnosis in 10kV/35kV networks, ensuring compliance with arc suppression requirements and ferroresonance risk assessment.
Application Scenarios of KDCJ-20Z Touchscreen Intelligent Impulse Withstand Voltage Tester**
The **KDCJ-20Z Touchscreen Intelligent Impulse Withstand Voltage Tester** is a high-precision instrument designed to perform full-wave lightning impulse voltage tests on various power equipment. It is widely used in the fields of power systems, electrical equipment manufacturing, scientific research institutions, and quality inspection departments. Below are its main application scenarios:
1. **Power Transmission and Distribution Equipment Testing**
- Used to evaluate the insulation performance of transformers, circuit breakers, insulators, switchgear, and other high-voltage equipment under simulated lightning conditions.
- Ensures that equipment can withstand transient overvoltages caused by lightning strikes or switching surges.
2. **Electrical Equipment Manufacturing and Quality Control**
- Applied in production lines and R&D labs for testing new products' dielectric strength.
- Helps manufacturers comply with international standards (e.g., IEC) and improve product reliability and safety.
3. **Research and Development in Electrical Engineering**
- Utilized by universities and research institutes for studying insulation materials, protective devices, and high-voltage technologies.
- Provides accurate and repeatable impulse waveforms for experimental analysis.
4. **Preventive Maintenance and Field Testing**
- Deployed by utility companies and maintenance teams to assess the condition of aging equipment in substations and transmission lines.
- Ensures long-term operational safety and reduces the risk of unexpected outages.
5. **Certification and Compliance Testing**
- Employed by testing laboratories to conduct standardized lightning impulse tests required for product certification (e.g., CE, UL, IEC).
- The built-in waveform evaluation algorithm ensures compliance with international test standards.
6. **Training and Educational Institutions**
- Used in technical training centers and educational institutions to teach students about high-voltage testing techniques and insulation coordination principles.
7. **Special Industrial Applications**
- Applied in industries such as rail transit, oil & gas, and renewable energy where high-reliability electrical systems are critical.
- Ensures that control systems, converters, and protection devices can withstand harsh electrical environments.
With features like touchscreen control, integrated waveform display, database management, and fast discharge protection, the **KDCJ-20Z** provides a safe, efficient, and user-friendly solution for high-voltage impulse testing across a wide range of applications.
Performance Description
Instructions for each button:
1. Actual measured current value display
2. Actual temperature value display
3. Ta burning time, also known as test time
4. Ti ignition time, which is the time from the test to the ignition of the specimen
5. Te extinguishing time, which is the time from the test to the extinguishing of the specimen
6. The test time is set to 30 seconds according to the standard. If there are different requirements, please set them separately
7. The experimental temperature is set to 960 ℃ according to the standard. If there are different requirements, please set them separately
8. Heating switch
9. Test start switch
10. Test stop switch
11. Record the ignition time switch (when the test piece is ignited and pressed)
12. Record the extinguishing time switch (pressed when the specimen is extinguished)
The high-voltage circuit breaker running in test system is designed for the running in test of high-voltage circuit breakers. It can simultaneously control the running in test of six circuit breakers. The parameter setting is intuitive, the timing control is simple, and the work efficiency is improved. The control ability of using time relays for running in avoids the disadvantage of burning out the opening and closing coils, effectively protecting the integrity of the circuit breakers. The KDGK-MH high-voltage switch running in test system is easy to operate and is a commonly used tool for circuit breaker design and testing.
500A 1000A 2000a high current generator transformer ratio test temperature rise test device
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Product Overview The pocket-sized lightning strike counter tester is a product meticulously designed and developed by our company's relevant technicians in
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