Remote Monitoring and Data Logging for GIS Gas Topping-Up Systems

GIS SF6 Topping-Up Technical Series — Part 4 of 5

In Part 3, we examined pressure regulation, valve control and protective functions. Once these functions are defined, maintenance personnel also need visibility of equipment status and a record of each topping-up operation.

Remote monitoring and data logging help answer three practical questions: What is happening now? What happened during the last operation? Does the equipment require attention?

A useful monitoring interface should identify the connected equipment and distinguish supply conditions from compartment conditions.

Key information includes:

• Equipment identifier and location: Links each reading to the correct unit and GIS compartment.

• Supply pressure P1: Shows the monitored supply pressure and any cylinder low-pressure warning.

• Compartment pressure P2: Provides visibility of the compartment-side pressure.

• Operating status: Indicates whether the unit is topping up, in standby or reporting a fault.

• Latest operation: Shows the most recent start and stop times.

A timestamp should accompany the readings so users can distinguish current information from previously received data.

Live readings describe the present condition. Event records preserve the sequence of an operation.

A practical topping-up record includes the equipment identifier, pressure before and after filling, start and stop times, and any associated warnings or faults.

Where manual commands or parameter changes are supported, recording the action, time and authorized user helps explain why the equipment operated as it did.

Pressure readings alone should not be presented as a measurement of the mass of SF6 added. Gas quantity reporting requires an appropriate measurement method.

Figure 1. Remote visibility and historical records complement local topping-up control. Available functions depend on the selected configuration.

Monitoring data can be transferred through the communication interface selected for the project. The receiving system may be a site management platform, a connected computer or an approved remote viewing interface.

Before integration, define the required data points, units, update intervals, equipment identifiers and alarm meanings. Data retention, export functions and the method for viewing historical records should also be agreed.

Mobile viewing, cloud storage and specific communication technologies should be confirmed in the technical proposal rather than assumed to be standard features.

Viewing pressure and status remotely does not automatically mean that users can change settings or start filling remotely.

If remote control is included, the project must define authorized users, permitted commands, local and remote operating priorities, and the conditions under which commands are accepted.

Remote access should preserve the approved local control and protection logic.

A communication interruption should be distinguishable from normal standby. An unchanged display without a clear timestamp could otherwise be mistaken for a current reading.

The design should define how connection loss is indicated, whether data is stored locally, and how records are handled after communication returns. These functions require verification during commissioning.

Records become more useful when reviewed across multiple operations.

Previous: Part 3 — Pressure Control and Safety Protection in Automatic SF6 Topping-Up

Contact KSTONE to discuss your monitoring interfaces, required data points and record-management needs.