MSGTU GTU High-Voltage Combined Test Platform (Partial Discharge-Free)

GTU High-Voltage Combined Test Platform (Partial Discharge-Free)
GIS Combined AC Withstand Voltage and Partial Discharge Test System

The GTU high-voltage, partial-discharge-free combined test platform—a combined AC withstand voltage and partial discharge test system for GIS—is primarily used for factory type tests and routine tests of GIS (Gas-Insulated Switchgear), GIL (Gas-Insulated Transmission Lines), and HGIS (Hybrid Gas-Insulated Switchgear).

Key Application Scenarios
1. Factory type tests and routine tests for GIS (Gas-Insulated Switchgear), GIL (Gas-Insulated Transmission Lines), and HGIS (Hybrid Gas-Insulated Switchgear).
2. On-site handover testing for GIS in newly constructed substations.
3. Insulation performance tests for basin-type insulators and built-in GIS instrument transformers.
4. Simultaneous withstand voltage and partial discharge (PD) testing for GIS following major overhauls. (With an optional external high-voltage bushing interface, testing capabilities can be extended to conventional high-voltage equipment such as transformers, switchgear, and insulators.)

Core Advantages (Compared to traditional modular PD-free systems)
✅ **Ultra-low background PD:** High-voltage components are fully enclosed and shielded, eliminating external corona interference. With a PD level of ≤1–3 pC at rated voltage, high-precision PD testing can be performed in standard factory environments without relying on shielded test laboratories.
✅ **Significantly enhanced safety:** All high-voltage components are housed within a sealed tank, and the enclosure remains at ground potential throughout operation, eliminating the risk of electric shock from exposed high-voltage parts.
✅ **Simplified wiring and high on-site efficiency:** Direct flange connection to the GIS eliminates the need for extensive high-voltage leads and support insulators, reducing positioning and connection time by over 50%.
✅ **Integrated design for easy transport and setup:** The high-voltage unit features a single-tank structure with modular integration of the variable-frequency power supply and control console, resulting in a smaller footprint.
✅ **Dual-function capability:** Selectable voltage-boosting modes—direct power-frequency boosting or variable-frequency series resonant boosting—making it suitable for large-capacity, long-busbar GIS (high capacitive load scenarios).

Technical Specifications (Higher ratings available upon request):
Test system for complete GIS units (withstand voltage & partial discharge):
Direct-connection or bushing-equipped types: 800kVA/800kV, 800kVA/600kV
Test system for GIS core components (withstand voltage & partial discharge):
800kVA/400kV, 800kVA/250kV
For instrument transformers, disc-type insulators, and insulating pull rods (single-station or 6-station specialized setups) or tank assemblies
600kVA/150kV
Notes:
800kV: Used for factory withstand voltage (680/740kV) and partial discharge testing of complete 550kV-class GIS units; also suitable for testing GIS components (instrument transformers, disc-type insulators, insulating pull rods).
600kV: Used for factory withstand voltage (460/510kV) and partial discharge testing of complete 363kV-class (330kV system) GIS units; also suitable for testing GIS components (instrument transformers, disc-type insulators, insulating pull rods).
500kV: Used for factory withstand voltage (460/510kV) and partial discharge testing of complete 252kV-class (220kV system) GIS units; also suitable for testing GIS components (instrument transformers, disc-type insulators, insulating pull rods).