MAINTENANCE OF LIGHTNING ARRESTERS (SURGE)

Figure 4-36. Lightning Arresters E101. E102. and E103

TM-9-6115-604-12 Generator Set Diesel Engine Driven Tactical Skid Rtd. 60 Kw 3 Phase 4 Wire 120/208 and 240/416 Volts Manual
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ARMY TM 9-6115-604-12 NAVY NAVFAC P-8-633-12 (2) Test (a) Remove 120 V ac switch (13, figure 3-11) in accordance with step (1), above. (b) Using a multimeter set to the RX1 scale, check continually across contacts of 120 V ac switch in one of the switching positions. (c) Place the 120 V ac switch in the other switching position and check continuity as in step (b), above. (d) Compare the results of the continuity checks made in steps (b) and (c), above. Multimeter should indicate infinite resistance in one of the switching positions and zero resistance in the other switching position. (3) Install. (a) Connect wiring to the 120 V ac switch (13, Figure 3-11) discard tags, and install 120 V ac switch in the receptacle box (15) with the screw and captive washer assemblies (12). (b) Install the switch plats (11) with the screw and captive washer assemblies (10). (c) Close CB124. 4-37. INSPECT GENERATOR ASSEMBLY . Generator G1 provides all main AC electrical power (750 kW) to output load terminals L1, L2, L3, and L0. Inspect the generator assembly (see figure 1-7) for signs of excessive heat, such as peeling paint, excessive noise, smoke, or abnormal odors. 4-38. MAINTENANCE OF LIGHTNING ARRESTERS (SURGE). To avoid death or Injury to personnel, no electrical component will be worked on while energized. Ensure equipment is "tagged out" In accordance with Chapter 1, Section III. of this manual and equipment is NOT energized. Residual voltage is present at the generator leads with the regulator turned on, reaching SEVERAL HUNDRED VOLTS on the generator set. Proper insulation and isolation of metering equipment must be observed when testing this generator. USE PROPER TEST EQUIPMENT TO CHECK FOR VOLTAGE before proceeding with work. a. General. Lightning arresters E101, E102, and E103 are connected between generator G1 phase lines L1, L2 and L3, respectively, and ground L0 Each arrester consists of porcelain clad units and required electrical attachments. A master nameplate located on the bottom of the lightning arrester casting gives pole voltage rating. b. Inspect. See figure 3-28 and figure 4-36. (1) Inspect base casting of arresters for cracks. Cracks In the base may indicate uneven tightening of hardware or uneven mounting surface. Replace if damaged. (2) Wipe down porcelain surfaces to remove soot, dirt, salt, etc. then inspect porcelain areas for fissures. Replace any lightning arresters with fissures. (3) Inspect line terminal and surrounding porcelain for damage. Check electrical connections at terminals for security. Replace any arresters with damaged porcelain. Tighten any loose connections. c. Removal. See Figure 4-36 (1) Tag and disconnect cables (11) from line terminals. (2) Remove lightning arrester (1) by removing hexagon head screws (2), lock washers (3), and hexagonal nuts (4). Tag and disconnect ground cables (11). 4-98

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