SMS SHZV - Tap-Changer Factory Test and Test Preparation; Test Preparation

HM0.460.3901
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10. Tap-changer Factory test and test preparation
10.1 Test preparation
10.1.1 OLTC Fully gas release
Before putting into operation for the first time, use the bleed plug of the suction pipe on the switch head to
deflate the connection pipe.
10.1.1.1 Gas release
a. Remove the M30 bolt cap on the air release valve E1 (use a No. 36 wrench).
b. Pry up the valve stem with a bolt cutter to deflate the tap changer head (Figure-10-1)
c. Tighten the bolt cap of the air release valve E1 (torque 9～12N.m.)
Figure-10-1
10.1.1.2 Gas release for the suction pipe on the pipe joint S
a. Remove the M16 bolt cap on the pipe joint S, and use a No. 16 wrench (Figure-10-2);
b. Open the notched bleed plug M6 connecting pipe to release gas;
c. Close the bleed plug (torque 2N.m.);
d. Close the bolt cap of the bleed plug. (Torque 8～10 N.m.)
10.1.2 Grounding
a. Connect the ground bolt of the tap changer head to the transformer cover (1 piece of M12
bolt and nut), 19mm wrench, torque 50-60 N.m., Figure-10-3.
Figure-10-2
Figure-10-3