600 kV Variable-Frequency AC Resonant Test System | RFQ Sourcing Details

This 600 kV-class variable-frequency AC resonant test system is designed for high-voltage substation testing. Model HMCXZ is identified for testing cables, gas-insulated switchgear (GIS), transformers, gas-insulated transmission lines (GIL) and other test objects selected for the configured system.

The regular system configuration comprises a variable-frequency power source, excitation transformer, high-voltage reactor and capacitive voltage divider. During testing, the reactor and the capacitance of the test object form a series-resonant circuit.

The voltage divider measures resonant voltage and supplies an overvoltage-protection signal, while the excitation transformer couples the variable-frequency source to the resonant circuit.

Supported operating data include a 20–300 Hz output-frequency range, 0.1 Hz adjustment sensitivity and stated frequency instability below 0.05%. The specified output is a sine waveform with total harmonic distortion below 1.0%.

The system provides automatic and manual operating modes, digital control through a controller or computer, print support, and over-current, over-voltage and flashover protection. Its stated full-power continuous working time is 60 minutes. The listed power input is 220/380 V single-phase at 50 Hz.

A more detailed specification states 220/380 V ±15% and 50 Hz ±5%;the exact input arrangement should therefore be confirmed for the ordered configuration and installation site. Output voltage and capacity are configuration-dependent.

The product is presented as a 600 kV test system, while the technical description states that rated output voltage can be configured according to the test object, up to 1000 kV, and maximum capacity can reach 20,000 kVA. These maximum figures should not be interpreted as the rating of every supplied set.

A partial-discharge configuration is also described. It uses a partial-discharge variable-frequency power source, excitation transformer, PD-free high-voltage reactor and PD-free capacitive voltage divider. The stated partial-discharge level is below 5 pC, or below 10 pC when voltage reaches 600 kV or above.

Buyers should confirm whether this configuration is included and under which rated-voltage and test conditions those limits apply. Before procurement, define the test object, required test voltage, load capacitance, test duration and applicable test procedure.

Request a configuration schedule identifying every system component and its individual ratings. Also confirm calibration documentation, acceptance criteria, controls, protection settings, cable and accessory scope, transport package, installation requirements, training, commissioning and the governing warranty terms.

Customization and calibration support are stated as available, but their exact deliverables require written agreement.