Commissioning of Electrical Systems for Command, Control

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TM 5-694 Reduce the conductor test potential to zero and measure residual voltage at discrete intervals. Upon the completion of the test, apply grounds for a time period adequate to drain all insulation-stored charge. When new cables are spliced to existing cables, the dc high-potential test shall be performed on the new cable prior to splicing. After test results are approved for the new cable and the splice is completed, an insulation resistance test and a shielding continuity test should be performed on the length of the new and existing cable including the splice. After a satisfactory insulation resistance test, a dc high potential test shall be performed on the cable utilizing a test voltage acceptable to owner and not exceeding 60 percent of factory test value. 3-10 Table 3-1. Medium-voltage cables maximum field acceptance test voltages (kV, dc) Insulation Type Rated Cable Voltage Insulation Level Test Voltage kV (dc) 5 kV 100 % 25 Elastomeric: 5 kV 133 % 25 15 kV 100 % 55 Butyl and Oil Base 15 kV 133 % 65 25 kV 100 % 80 5 kV 100 % 25 5 kV 133 % 25 8 kV 100 % 35 8 kV 133 % 45 Elastomeric: EPR 15 kV 15 kV 100 % 133 % 55 65 25 kV 100 % 80 25 kV 133 % 100 28 kV 100 % 85 35 kV 100 % 100 5 kV 100 % 25 5 kV 133 % 25 8 kV 100 % 35 8 kV 133 % 45 Polyethylene 15 kV 100 % 55 15 kV 133 % 65 25 kV 100 % 80 25 kV 133 % 100 35 kV 100 % 100 NEMA Table 10.6 Derived from ANSI/IEEE Standard 141-1993 Table 12-9 and by factoring the applicable ICEA/NEMA Standards. NOTE: AEIC CS5 and CS6, and ANSI/IEEE Standard 400 do not differentiate cables based upon insulation thickness and, consequently, list differing test voltages. Insure that the maximum test voltage does not exceed the voltage limits for potheads and terminators specified in IEEE Std. 48 (IEEE Standard Test Procedures and Requirements for High-Voltage AC Cable Terminations) or for molded rubber terminations specified in IEEE Std. 386 (IEEE Standard for Separable Insulated Connector Systems for Power Distribution systems Above 600 V), or manufacturer’s published data. Reprinted from NETA's Acceptance Testing Specifications, copyright 1999. Courtesy of the International Electrical Testing Association. All rights reserved.
4-1. Description of main power system CHAPTER 4 MAIN POWER SYSTEM TM 5-694 The following is a sample main power system with associated one-line and wiring diagrams for use as a guide for implementing the test procedures described in the preceding chapters of this manual. The major equipment in this main power system includes 34.5 kV circuit switchers, 15,000 kVA oil filled transformers, and 13.8 kV metal clad switchgear including relays and controls. The equipment, accessories, interconnections, ratings, and cabling are shown in figures 4-1 through 4-7. All wiring connections and interconnected components should be verified during commissioning. Figure 4-1 diagrams the main power system single line on page 4-7. Figure 4-2 diagrams the main power system control cable block diagram on page 4-8. Figure 4-3 diagrams the main power system circuit switcher on page 4-9. Figure 4-4 diagrams the main power system switchgear load breaker on page 4-10. Figure 4-5 diagrams the main power system switchgear incoming breaker on page 4-11. Figure 4-6 diagrams the main power system circuit switcher wiring diagram on page 4-12. Figure 4-7 diagrams the main power system incoming breaker wiring on page 4-13. a. Switches. The 34.5 kV circuit switchers are outdoor vertical break, shunt trip with full momentary current capability and limited fault current interrupting for applications feeding power transformers. Each switch contains a high speed high torque power operator, interrupting units, disconnects, and post insulators. The operator receives a trip or open signal from relays or a control switch, trips the interrupter, and then opens the disconnect. If too much shunt current is available the relaying scheme will block the switch from opening until the current decreases to an acceptable level. Each circuit switcher has a 125 Vdc control circuit for control, relaying, and operator power. The circuit switcher is intended to operate on transformer overload, transformer secondary faults, transformer through faults not cleared by down stream switchgear breakers and low value high resistance transformer faults. The 12/15 MVA power transformers are outdoor oil filled with radiators and fans for cooling, temperature and fault indicating relays, bushing mounted current transformers, no load secondary tap changer, and a control and alarm panel. The control and alarm panel requires a 120/208V, three phase power source for the controls, cabinet heater, and alarms. The 13.8 kV switchgear is indoor; metal clad with individual spring operated vacuum circuit breakers and controls. b. Breakers. The switchgear line-up contains two incoming, one tie, and eight load breakers. Each breaker has a relay/control compartment containing a control switch, indicating lights, relays, control wiring, and terminal blocks. The breakers have electrical and mechanical interlocks to prevent inadvertent operation, open/close springs, spring charging motors, position switches, and close and test positions. An auxiliary compartment in the switchgear is used to house the circuit switchers’ control, indication, relays, and remote alarms; and the transformer remote alarms. For control, each circuit switcher and switchgear breaker has a control switch, indicating lights and relays. Each circuit switcher trip circuit contains overcurrent, differential current, transformer overload lockout, and transformer sudden pressure relays. The switchgear and load breakers have overcurrent relays. The tie breaker has no relaying, and is intended to be closed to the switchgear bus together when a transformer is out of service. It is interlocked to open or block closure if both of the incoming breakers are closed. There are potential transformers (PTs) on both sides of the switchgear and load circuit breakers. They are connected to undervoltage relays and sync check relays. The switchgear requires a 125 Vdc control and relay feed and 120 V single phase feed for space heaters. 4-1
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
Page 15 and 16: TM 5-694 component testing (i.e. tr
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
Page 31 and 32: TM 5-694 motor is ready for energiz
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Page 35: TM 5-694 they have the correct pola
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
Page 47 and 48: TM 5-694 Figure 4-5. Main power sys
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 63 and 64: WILL NOT RUN POOR PERFORMANCE OTHER
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Page 67 and 68: 1. PLANT/BUILDING Bldg 316 4. EQUIP
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Page 75 and 76: TM 5-694 No transfer from Inverter
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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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