650kV Variable Frequency AC Withstand Voltage Tester High Voltage Test Systems for GIS And Substation Equipment Testing
Product Description
650kV Variable Frequency AC Withstand Voltage Tester High Voltage Test Systems for GIS And Substation Equipment Testing
Introduction
The GDXZ-650kV Variable Frequency Series Resonance Hi-pot Test System integrates innovation, reliability, and practicality. Engineered to tackle the complexities of AC withstand voltage testing for large-scale power equipment, it offers precise, efficient, and secure testing solutions. Suitable for new equipment handover tests, routine preventive maintenance, and fault diagnosis, the system delivers consistent performance.
It aids users in identifying insulation weaknesses, ensuring the safe and reliable operation of power systems.
Features
Flexible Working Modes: Offers three operating modes - fully automatic, manual, and auto-tuning manual boost. Users can select the most suitable mode according to on-site conditions, significantly improving test efficiency. The automatic frequency sweeping function allows arbitrary setting of the starting frequency within the specified range, and the LCD large screen displays the scanning curve, enabling intuitive observation of resonance point detection.
Intelligent Data Management: Supports off-site data storage and printing. The stored data is labeled with numeric identifiers for easy identification and retrieval. This feature facilitates test result analysis, report generation, and data archiving, streamlining the workflow for test teams.
Easy Function Expansion: Built on the DSP platform, the system can be easily upgraded and expanded with additional functions according to user needs. The human-machine interface is designed to be intuitive and user-friendly, reducing the learning curve for operators.
Precise Voltage Control: The voltage tracking system automatically calibrates for large voltage fluctuations. To ensure test accuracy, it is recommended to set the test voltage 2% lower than the target voltage, considering the small fluctuations of the power grid voltage.
Comprehensive Safety Design: In addition to the core protection functions, the system requires reliable grounding during operation to prevent electric shock hazards. All connection lines are clearly defined to avoid misconnection, which could lead to equipment damage.
Technical Specifications
| Category | Details |
|---|---|
| Core Components | Variable Frequency Power Supply (GDXZ-75kW/AC240V): Rated output capacity 75kW, frequency adjustment range 30-300Hz, voltage resolution 0.01kV. Excitation Transformer (JLB-55kVA/6.875/13.75/27.5kV/0.4kV): Oil-type structure, input voltage 0-280V. High Voltage Reactor (GDDK-330kVA/165kV): 4 sections, each with inductance 250H, Q≥30. Capacitive Voltage Divider (FY-500pF/660kV): Voltage division ratio 6600:1, measurement accuracy Class 1.5 |
| Protection Functions | Over-voltage, over-current, zero-start, system detuning (flash-over) protection |
| Environmental Adaptability | Operates in temperatures from -20℃ to 55℃, relative humidity ≤90%RH, and altitudes up to 3000m |
| Physical Parameters | Variable frequency power supply weight: ~50kg; Noise level ≤50dB |
Standards
DL/T 596-1996 Regulations for Preventive Testing of Electric Power Equipment
GB50150-2006 Standard for Handover Test of Electrical Equipment for Installation of Electrical Installations
IEC358(1990) Coupling Capacitors and Capacitance Dividers
DL/T474.4-2006 Guidelines for the Implementation of Field Insulation Tests - AC Withstand Voltage Test
Application Fields
Power Cable Testing: Suitable for AC withstand voltage tests of cross-linked polyethylene cables with rated voltages up to 550kV. The test voltage and time can be set according to national and enterprise standards, ensuring the insulation performance of the cables.
Transformer Testing: Conducts AC withstand voltage tests for power transformers with nominal system voltages from 3kV to 750kV, covering both handover and preventive tests.
Generator Testing: Tests stator windings of generators with capacities above 10000kW, adhering to the test voltage formulas and requirements specified in relevant standards.
GIS and Switchgear Testing: Provides AC withstand voltage tests for GIS, SF6 circuit breakers, and busbars, ensuring the insulation reliability of substation equipment.