RYBELECTRICAL

Servicing of all types of transformers, dry type, and oil type up to 220 KV.
Checking of hotspots, inside the cable chambers, with contactless thermometer.
Checking of cable tightness, Cleaning & sealing the cable box for vermin proofing.
Fixing of gaskets, stopping of oil leakages, checking of control wiring & its tightness.
We carry out following tests on transformers during maintenance & commissioning.
IR & PI value test.
Ratio test.
Vector group test.
Core Balance test.
Magnetizing current test.
Winding resistance test.
RTCC panel testing for ON LOAD TAP CHANGER.
Tripping trials by operating Buchholz, WTI, OTI, Oil surge relays.
Oil filtration to improve BDV of oil.
Oil DGA & Screening test.
We also carry out installation of transformers upto 20MVA

Installation, servicing, repairs,maintenance & testing of all types of MV & LV Breakers like SF6, MOCB, VCB & ACB.
Fault finding, rectification of MV, LV panels.(Including MCCBs, Contactors having BMRs).
We perform following tests for all types of Breakers.(Whatever applicable).
Checking of Mechanical & Electrical operations & interlocks.
IR value test.
HI-POT test up to 60 KV for DC & up to 50 KV for ACs.
Breaker timing.
Contact Resistance test.
General wiring checks.
Wiring modifications.
Checking of mechanical & electrical interlocks.
MilIvolt drop test on bus bars & bus ducts.
Primary injection test & tripping trials.
Stability test on differential & REF(Where ever required).

Calibration of the meters, injecting three phase currents & voltages, using phantom load set.
Variation of phase angles using 3 phase phase-shifter.
Calculation of errors in comparison with calibrated precision standard meter.
We also carry out installation of above said equipments.

Capcitance measurement.
Inductance measurement.
Balance and unbalance test on capacitor bank.
Relay settings as per OEM
Erection, Testing and commissioning of HT/LT Capacitor banks upto 40 MVA. 132 kV.