Stelmec designs and manufactures the following control and relay panels to meet the needs of control, instrumentation and protection.
Simplex type panels
Comprises of relays, meters, selector switches and other operative / signalling devices.
Duplex type panels
Comprises of meters, selector switches and other operative / signalling devices. This panel is provided with a walkway for access to internal components and terminals of front and rear mounted devices.
Control desks
A desk shaped panel enables the operator to sit in front and control various operations.
Construction
The panels are constructed using superior quality sheet steel. All the fabricated parts are thoroughly cleaned using seven-tank pre-treatment process [involving degreasing, derusting, phosphatizing and passivation] and are then coated with primer. The panel doors are fully gasketed for protection against dust / vermin entry.
Every component used in the panel is thoroughly supervised by qualified and skilled personnel, to ensure supply of quality product.
Layout
The front side of the panel houses meters, switches and other active devices. In case of simplex panels, the relays are also mounted on the front side of the panel.
The front side of the panel and internal layout is made to suit ergonomic and aesthetic requirements. Adequate space is provided for cabling, operation and testing. The front side of the panel can have mimic diagrams like painted mimic with colours for voltages in line with standard / customer requirement which can be provided with semaphore indicators, discrepancy switches etc. For active display of system conditions.
Wiring
Wiring is done with 1100-volt grade multi-stranded pvc wires. These wires are neatly bunched together with pvc troughs for ease of working. The wiring at both ends is supported with self-locking ferrules and terminal strips for ease of cable termination. The panel is provided with an internal illumination lamp controlled by a toggle / door switch to facilitate maintenance work.
Quality assurance
Rigorous quality checks are done at various stages of manufacturing. On the completely assembled panel, following tests as per is:8623 are conducted.
Continuity of wiring
Functional test-simulated scheme operation
Power frequency hv withstand test
Physical verification
