State Grid Shows 12 Robotic Systems for Live Line Work Up to 1000 kV in Beijing

State Grid Corporation of China exhibited seven complete robots and five core software packages at the World Robot Conference in Beijing, including an X-ray inspection unit that examines compression fittings live across the full voltage range from 35 kV to 1000 kV with no personnel climbing the tower.

The twelve items on the utility's stand all address core grid business, with the stated aim of substituting machines for human operators. That framing matters beyond China: line inspection at extra-high voltage remains one of the most labour-intensive and hazardous maintenance categories for transmission operators anywhere.

The X-ray fitting robot inspects a single tension fitting in 20 minutes, which State Grid says sharply raises detection throughput. Inspection of compression joints on energised conductors conventionally requires crews working at height on the structure.

A second unit targets defective insulators, achieving 100% detection coverage and resolving electromagnetic compatibility constraints. The design broke through high-voltage electromagnetic shielding and photoelectric conversion techniques, according to the same exhibition material.

State Grid also displayed two newly developed underwater inspection robots. One is untethered and detects submarine cable faults; the other is tethered and carries optical, acoustic and magnetic sensing modules. The tethered machine supports three operating modes: suspended movement, seabed walking, and vessel-machine cooperation.

"These two robots mark an important breakthrough in underwater inspection," said Guo Rui, chief scientist at State Grid Intelligent Technology.

The software side of the stand collects five algorithmic results, among them defect recognition, autonomous navigation, and an embodied intelligence large model. Those three functions map directly onto the bottleneck in autonomous inspection: identifying a fault from imagery, reaching the asset without a pilot, and generalising across asset types.

The conference opened in Beijing under the theme of human-machine symbiosis, with an exhibition area of close to 50,000 square metres. It drew 373 Chinese and foreign companies showing more than 3,000 innovative products, alongside 30 international supporting institutions and more than 500 guests.

For the first time the event set up a dedicated pavilion for centrally owned state enterprises, where 48 groups presented 12 high-value application scenarios. The grid operator's presence sat inside that pavilion, placing transmission maintenance alongside the other industrial use cases the state sector chose to put forward.

Utilities in North America, the United Kingdom and Asia face the same physics on high-voltage circuits: outage windows are expensive, live-line work carries risk premiums, and skilled linemen are scarce. A tool that reads a compression fitting in 20 minutes without de-energising the circuit or sending a worker up the structure attacks all three constraints at once. The submarine variants address a parallel gap, since offshore export cables and interconnectors are inspected today by crewed vessels and remotely operated vehicles.

What the Beijing display does not settle is deployment scale. The twelve results were shown as exhibits, not as fleet statistics. Their significance for operators elsewhere lies in the specification: full-voltage-range live detection to 1000 kV and 100% insulator coverage are the performance thresholds against which competing robotic inspection programmes will be measured.