Gas Insulated Swichgear ( GIS) - GENERAL EARTHING INFORMATION

Earthing and return current conductors

Earthing conductors

Earthing conductors interconnect the GIS enclosure at numerous points with the earthing net (multipoint earthing). Being a component of the earthing system they effectively help to avoid dangerous touch voltages during a short circuit, and to keep HF transient overvoltages on a sufficiently low level during normal service. To meet these requirements they shall have low impedances at 50/60 Hz as well as in the HF range.

Relay list for 13.8 KV swichgear

Following is sample of required relays for 13.8 KV SWGR

Impact recorders for transformers shipping

Impact Recorders continually monitor and report in real-time the shock, vibration and environmental conditions experienced by structures, facilities or equipment during transit, storage and operation. ShockLog impact recorders register the direction, amplitude, and duration of impact force. Optional sensors record changes in temperature, humidity, atmospheric pressure, tilt and roll. A GPS/ GPRS tracking module is available to pinpoint the location of mishandling or exposure to adverse conditions.  impact recorders are acute impact detection devices, which help to deter, monitor and minimize damage at each link of your supply chain

types of impact recorders:

1- electronic

2- analog

Below is Sample of inspection report for electronic impact recorder

Transformers installation, shipment ,handling instructions & site tesing

Tightening torques for MV SWGR

Installation and maintenance manual for air core dry type reactor

Maintenance of DC system chargers and batteries

adv.

Safety & Environment

 When performing battery maintenance, eye wash solution shall be readily available. Battery rooms should be well ventilated. Use bicarbonate of soda solution, 1.0 lb bicarbonate of soda to 1 gallon of water, to neutralize acid spillage. Batteries are heavy and proper lifting techniques should be employed. Much of the battery work is done upstream of any protective breakers or fuses so extreme care should be taken to avoid short circuiting a single cell or battery set. Keep tools insulated. For the protection of our employees and the environment, employees should stay abreast of and adhere to all safety rules, established work practices, and environmental compliance practices while performing maintenance on this equipment.

Battery Inspection:

·        Verify that battery box is in good condition x Inspect the locks, lid, hinges, cable supports and rails to be in good condition. Repair as necessary. x Inspect any fuse blocks, fuses and cables for corrosion, loose connections and deteriorated fuse barrels. Repair as necessary.

·        Verify that battery room and rack is in good condition.

·        Inspect the room to be clean and free of peeling paint. Clean and repair as necessary.

·         Inspect the room lighting and ventilation to be functioning correctly. Clean and repair as necessary.

·         Inspect the rack to be clean, free of corrosion, stable and able to support the battery weight. Clean and repair as necessary.

·        Battery Physical Condition Inspection:

·         Inspect battery to be clean, case has no cracks, no leaks and tops are dry and not lifting. Clean and repair as necessary.

·         For clear cases inspect the plates for warping and excessive sedimentation. Document any abnormal conditions.

·         Inspect battery straps to be free of corrosion. Clean and repair as necessary.

·         Inspect battery terminal connections to be free of corrosion. Clean and repair as necessary.

·         Coat all cleaned or replacement connectors, posts, and hardware with a thin film of no-oxide grease.

·         Total  resistance  to be measured , Measured values should be 0.1 milli-ohm.