Commissioning of Electrical Systems for Command, Control

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TM 5-694 be increased to compensate for the current being supplied by the charging source to the battery. Read and record the individual cell voltages and the battery terminal voltage. The readings should be taken while the load is applied at the beginning and at the completion of the test and at specified intervals. There should be a minimum of three sets of readings. Individual cell voltage readings should be taken between respective posts of like polarity of adjacent cells so as to include the voltage drop of the intercell connectors. Maintain the discharge rate and record the elapsed time at the point when the battery terminal voltage decreases to a value equal to the minimum average voltage per cell as specified by the design of the installation times the number of cells. 3-8 b. Capacity check. The capacity of the battery is checked using the following equation: Where: Percent Capacity at the test rate at 25ºC (77ºF) = (ta / ts) x 100 ta is the actual time of the test to specified terminal voltage as corrected for temperatures ts is the rated time to specified terminal voltage 3-11. Battery chargers The first step towards acceptance of any device is verification of nameplate data. The nameplate on all equipment shall be checked against one-lines and schematics. All equipment shall be carefully examined upon receipt to ensure that no damage has occurred during shipment. A visual inspection should be performed to verify the completeness of the equipment, correctness of installations, supports, grounding, and wiring. The rating plate shall be checked to ensure that both the ac supply to the charger and the battery to be connected corresponds to the charger’s parameters. Confirm that all shipping and other debris in and around the charger cabinet have been removed. Check settings of the charger and calibrate per manufacturer’s manual to match the battery (float and equalizing levels). If the battery charger has been factory set, check the charger float and equalizing voltage levels against drawings and specifications. If not, set the charger float and equalizing voltage levels to those listed on drawings and specifications. Before connecting to the battery, measure the output voltage provided by the charger and record. Verify that all charger functions and alarms operate correctly. Verification that the battery is connected to the battery charger properly is extremely important. The negative wire from the negative terminal of the battery must be connected to the negative terminal of the charger. Similarly, the positive wire from the positive terminal of the battery must be connected to the positive terminal of the charger. A battery charger is an electronic device that converts ac power to dc power. The charger supplies this dc power to the battery. As with all electronic devices, this device should not be megger tested. 3-12. UPS systems The first step towards acceptance of any device is verification of nameplate data. The nameplate on all equipment shall be checked against one-lines and schematics. All equipment shall be carefully examined upon receipt to ensure that no damage has occurred during shipment. The Static UPS System consists of the battery charger, inverter, battery, transfer switch, circuit breakers, and cables. A picture of a typical UPS systems is seen in figure 3-1. Of the UPS system, the component testing for the battery charger, battery, transfer switch, circuit breakers, and cables are described individually in this manual. The inverter is similar in construction to the charger. It converts dc power to ac power using solid state electronics. Therefore, this device should not be megger tested. The completeness of the assembly shall be confirmed. A visual inspection should be performed to verify the correctness of installations, supports, grounding, and wiring. Verify that the air inlets are not obstructed. The interconnections shall be checked against the wiring schematic to ensure the proper phasing and voltage connections. For example, both the battery charger connections to the battery and the battery to the inverter should be checked to insure that
TM 5-694 they have the correct polarity. Measure the input voltage provided by the battery and record. Measure the output voltage and current from the inverter and record. Verify that these values correspond to the design values. 3-13. Cables For commissioning of cables, the receipt inspection and testing is performed while the cable is still on the reel. The exposed sections of the cables are visually inspected for signs of physical damage, the end caps are checked for tightness. The cable types and configuration are checked for correctness against drawings and purchasing documents. Continuity tests are performed on each conductor and the shield. For power cables, insulation resistance tests are performed between each conductor and each conductor and the shield. The cable installation shall be checked against one-lines and schematics. After installation, the cables are inspected for damage, proper trained bending radius, adequate spacing for ampacity, proper installation of fireproofing, proper size, termination, and identification. Next, conductors are checked for continuity. The following tests shall be performed before the cables are energized. They are the insulation resistance (megger) test and the dc hi pot test. For medium and high voltage shielded cables the acceptance is dependent on the dc hi pot test. A satisfactory test is the exponential decrease of current with time with a fixed dc voltage applied. Non-shielded cables are not Figure 3-1. Static UPS system 150 to 750 kVA (courtesy of Liebert) subject to the Hi-Pot test because only the sections of cable in contact with ground (such as cable tray rungs) are actually tested and therefore the test is not meaningful. Test duration should not exceed 5 minutes for nonshielded cable or 15 minutes for shielded cable. When performing a dc high potential test on cables, all precautions and limits as specified in the applicable NEMA/ICEA (Insulated Cable Engineers Association) standard for the specific cable should be followed. Tests should be performed in accordance with ANSI/IEEE Standard 400. Test voltages shall not exceed 80 percent of cable manufacturer’s factory test value or the maximum test voltage in table 3.1 below. The test procedure should be as follows and the results for each cable test shall be recorded. Test each section of cable individually with all other conductors grounded. All shields must also be grounded. Terminations shall be adequately corona-suppressed by guard ring, field reduction sphere, or other suitable methods as necessary. Precaution should be taken to insure that the maximum test voltage does not exceed the limits for terminations specified in IEEE Standard 48 or manufacturers specifications. 3-9
Page 1 and 2: TECHNICAL MANUAL TM 5-694 COMMISSIO
Page 3 and 4: This manual supersedes TM 5-694 dat
Page 5 and 6: LIST OF FIGURES This manual superse
Page 7 and 8: TM 5-694 1-5. Component testing The
Page 9 and 10: 2-1. Introduction CHAPTER 2 GENERAL
Page 11 and 12: (4) Control sequence (truth-table)
Page 13 and 14: (9) Energizing of equipment. Includ
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Page 17 and 18: 2-4. Insulation testing TM 5-694 In
Page 19 and 20: TM 5-694 Unlike the insulation-resi
Page 21 and 22: TM 5-694 h. AC high-potential testi
Page 23 and 24: TM 5-694 d. Dissolved gas in oil an
Page 25 and 26: TM 5-694 voltage level is difficult
Page 27 and 28: 3-1. Introduction to component test
Page 29 and 30: 3-4. Switchgear - medium voltage TM
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Page 37 and 38: 4-1. Description of main power syst
Page 39 and 40: switches and interlocks, bus insula
Page 41 and 42: TM 5-694 b. Energization of main po
Page 43 and 44: Figure 4-1. Main power system singl
Page 45 and 46: Figure 4-3. Main power system funct
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Page 49 and 50: Figure 4-7. Main power system incom
Page 51 and 52: 1. PLANT/BUILDING Bldg 358 4 . EQUI
Page 53 and 54: 1. PLANT/BUILDING Bldg M-1 4 . EQUI
Page 55 and 56: CHAPTER 5 STANDBY POWER SYSTEM 5-1.
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Page 75 and 76: TM 5-694 No transfer from Inverter
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TM 5-694 sensitive equipment to be
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TM 5-694 (3) To contain or divert r
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TM 5-694 IEEE 400 "IEEE Guide for M
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TM 5-694 IEEE Transactions on Indus
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TM 5-694 The proponent agency of th
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1. PLANT/BUILDING EXTERIOR OF EQUIP
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1. PLANT/BUILDING EXTERIOR OF CABLE
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1. PLANT/BUILDING 17. EXTERIOR OF E
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1. PLANT/BUILDING COMPONENT INSPECT
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Commissioning of Electrical Systems for Command, Control

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