Automatic system for thermal-imaging diagnostic (ASTID) for the substation electrical equipment is based on mass-produced thermal-imaging modules ASTROHN-TA. Designated software for control and early flaw growth detection performs a non-contact IR diagnosis of any equipment that comes in sight of the system. In case of hardware malfunction, the system detects flaws in its operation real-time (i.e without turning off or deactivating the equipment) in the context of application conditions. The monitoring is automatic and put into practice by built-in data-mining system for heat distribution analysis (thermoanalysis). Built-in thermoanalysis allows to monitor all of the equipment types as per individual algorithms that are correspond with equipment groups, according to RD 153-34.0-20.363-99 “Method for Infrared Inspection of Electrical Equipment and Overhead Lines”.
- Equipment state estimation
- Technical specifications
- Layout in ASTID
- Data processing principle
Electrical equipment and conductive parts state estimation depending on its operating conditions and construction is done by:
- heating temperature limit;
- temperature rise;
- excess temperature;
- defect rate;
- temperature time march;
- comparing measured temperature values with known good equipment temperature values.
Different states of derangements are distinguished during the automatic conductive parts thermal state rating based on forthcoming defect rate values:
- up to 1,2 – first stage of defect which need to be kept control of;
- 1,2…1,5 – developed defect; you need to take steps to ensure troubleshooting will be done as soon as line is down;
- over 1,5 – abnormal defect which is needed to be fault handled immediately.
Thermal imaging control is the only way to keeping track of equipment during its work and therefore the best descriptive and accurate one.
The capability of installing the thermal imaging equipment for the full-time railway substations’ energy equipment control is the major step with the aim of uninterruptable accident free power supply.
Using the automatic alarm system based on full-time thermal imaging surveillance will allow diagnosing problems early in its development.
Automatic system for twenty-four-hour thermal-imaging diagnostic ASTROHN-TA consists of:
- thermal-imaging units with analytics system for temperature fields processing;
- detectors (temperature, climatic, humidity, wind speed, etc.);
- fiber optic line for signal transmission;
- storage sever;
- AWS (automated working station).
|Service conditions||УХЛ 1 or ЭХЛ 1 GOST 15150|
|Power supply||АС220V±20%, АС24V±20%, PoE|
|Power frequency||50 Hz|
|Spectral band||7-14 µm|
|Pixel size||17 µm|
|Power usage||Max. 30 W, at the moment of activation
Max. 12 W, heating/cooling
Max. 6 W, without heating/cooling
|Terminal ilsulation||3000 V|
|Impulse current||Up to 20 kA|
|Supply isolation durability category||GOST Р50571.19-2000|
|Size||330×230×180 without lans screen
330×300×180 with lens screen
|Weight||No more than 25 kg|
The built-in intelligent analytics processes the signal based on data received from thermal-imaging fields. The alarm is generated by the reference thermoanalysis conditions. The alarm then is transmitted by the optical fiber connection to the existed server to record and displaying at the AWS.
If the monitoring values are above the limit, the equipment will send the alarm to the system of collecting and processing information (e.g. video surveillance system “Intellect”) and also display the alarm at the AWS while also displaying the problem subject.
Twenty-four-hour thermal-imaging control with help from “Automatic system for thermal-imaging diagnostic of electrical equipment” based on thermal-imaging modules ASTROHN-TA allows to perform monitor and early diagnostics of the power converters, high-voltage bushes, disconnecting devices, switches, contact joints and other equipment at the open distribution units and electric substations. You can make a successful conclusion of current processes by defining the thermal state of inspected equipment.
With the aid of twenty-four-hour thermal-imaging diagnostics you can expose following damage:
- for main transformers: seats of origin of stray magnetic fields; the presence of stall zones in the tanks due the sintering, swelling or sheath isolation displacement; oiling system malfunction; input and cooling systems defects;
- for multiplexing equipment: power rail contact point, working and interrupter units overheating; innertank isolation failure; input defects; cracks in shackle supporting insulators;
- for measuring transformers: external and internal contact joints overheating; inner sheath insolation reliability weakness;
- for valve dischargers and overvoltage suppressors: elements depressurization; diverters breakoff; elements configuration deviation;
- for condensers: elements units disruption;
- for high-frequency chokes: contact joints thermal overload.