emergency switchboard

450 VOLT EMERGENCY GENERATOR SWITCHBOARD CONTROL AND INSTRUMENTATION PANEL GENERAL INFORMATION The 450 volt emergency generator switchboard consists of a control panel and instrumentation panel, emergency generator output breaker (52E), and a power distribution sections. This chapter will discuss the control and instrumentation section. DETAILED INFORMATION Major Components of the Control and Instrumentation Components mounted on panel door: • • • • • • • • • • • • • • • • •

Ammeter Kilowatt Meter Voltmeter 27 (under voltage relay normal) Frequency Meter 27E (under voltage relay emergency) Normal Power Available Lamp Emergency Power Available Lamp Auto-Off-Manual Switch (voltage regulator) Volt ADJ RHEO Mode Selector Switch 43 (Test Auto Off Man) with Amber Lamp 52 ECS Breaker Control (trip close) with Amber and Blue Lamps Emerg Gen Heater Switch with White Lamp Ammeter Switch Voltmeter Switch Ground Detector Lamp(s) and Test Pushbutton Governor Speed Adjustment Switch (Synchronizing Motor)

Components mounted inside switchboard enclosure: • • • • •

Basler Electronic Voltage Regulator KATO Volt-Per-Hertz Sensing Module KATO Auto-Manual Module (generator excitation control) KATO Pilot Exciter (permanent magnet generator) Simplex Automatic Engine Starting Control System

BASLER ELECTRONIC VOLTAGE REGULATOR

Daniel Robson Chief Engineer

T/V KINGS POINTER Emergency Switchboard

Revised: 3/21/02 Page: 1

The Model No. SR-A voltage regulator consists of transformers, transistors, thyrtstors (SCR's), silicon diodes, resistors and capacitors. The regulators contain no electrolytic capacitors, are not subject to wear from moving parts and are relatively unaffected by temperature, humidity, vibration or shock. The voltage regulator senses the generator voltage, compares a rectified sample of that voltage with a reference zener diode voltage and supplies the exciter field current required to maintain he predetermined ratio between generator voltage and the reference voltage. Voltage regulation is less than +/- 1/2% average voltage. Response time is (16) milliseconds.

VOLTS PER HERTZ MODULE A KATO Volts-per-Hertz module is utilized with the emergency generator. Where satisfactory engine speed recovery, following large step changes in load, is dependent upon a decrease in power demand upon the engine. The Volts-per-Hertz assembly reduces demand on the engine under speed operation by reducing the generator output. The Volts-per-Hertz assembly also provides generator and voltage regulator under frequency protection by keeping the voltage regulator output and generator field excitation below the safe maximum level during under speed operation such as engine idle.

AUTO MANUAL MODULE The auto-manual module is a single-phase bridge rectifier and an autotransformer. It receives ac power and delivers manually-controllable do power. Via an AUTO-OFF-MANUAL switch the operator can connect the generator exciter field to the automatic voltage regulator or the manual control circuitry or can remove all input to the exciter field. In the OFF position the switch removes input power to the automatic voltage regulator. The switch is mounted on the emergency switchboard control an instrument panel. • "AUTO" - Connects the generator exciter field and the 120 VAC PMG power to the Basler Automatic Voltage Regulator. • "OFF" Removes input power to the voltage regulator and input power to the generator, exciter. • "MAN" - Removes input power to the auto voltage regulator and connects 120 VAC power from PMG to a stationary bridge rectifier.

Daniel Robson Chief Engineer

T/V KINGS POINTER Emergency Switchboard

Revised: 3/21/02 Page: 2

SIMPLEX AUTOMATIC ENGINE STARTING CONTROL SYSTEM The Simplex Automatic Engine Control is used to automatically start and stop a diesel engine upon closure and opening of control contacts. The automatic engine control also provides automatic engine protection and visual annunciation upon failure of the engine to function properly in the following areas: overcrank, low oil pressure, overspeed, high water temperature. An additional shutdown circuit is provided for the Halon Fire Fighting System. The engine control switch (ACS) is used to determine auto start mode of operation. "Off/Reset" position is used to deactivate or reset the auto-start unit. "Auto" position is used for remote starting of the engine. "Run/Test" position is used for local operation to start the engine or for test purposes. Normal engine shutdown occurs by placing the engine control switch (ACS) in the "Off/Reset" position. The engine will automatically shut down under any one or more of the fault conditions as designated above, along with a light indication of which particular fault occurred. After the fault is corrected, the engine control switch (ACS) must be momentarily placed in the "Off/Reset" position. OPERATION AUTOMATIC TRANSFER SCHEME FOR EMERGENCY POWER The operation of the automatic bus transfer equipment is designed to assure a continuous source of power for all emergency power loads energized from the emergency switchboard. The "43" (bus transfer) switch located on the front of the emergency switchboard is manually operated with the following positions: TEST, AUTO, OFF, MAN. The switch can be locked and the key removed in the AUTO position only. The TEST position is spring returned to the AUTO position. All other positions are maintaining. AUTO With the VOLT REG switch and selector switch "43" in AUTO and under normal conditions; the emergency generator circuit breaker 52E is OPEN and the normal bus-tie circuit breaker 52N is CLOSED so that the emergency switchgear bus is supplied from the ship's service main switchgear through the bus-tie circuit. If the emergency diesel SIMPLEX automatic engine starting control system is energized and in AUTO, the amber status above selector switch "43" will be illuminated. Daniel Robson Chief Engineer

T/V KINGS POINTER Emergency Switchboard

Revised: 3/21/02 Page: 3

If the voltage on the bus-tie drops below 85% of rated (382.5 volts), the normal source undervoltage relay "27" will drop out which will de-energize diesel start time (2E). After a preset time of 5.0 seconds "2E" contacts close completing the circuit to the SIMPLEX automatic engine starting control system, starting the emergency generator engine. When the emergency generator voltage builds up to 85 to 95% of rated, the emergency source undervoftage relay "27E" will pick up and contacts of this relay will trip circuit breaker 52N, disconnecting the emergency bus from the ship's service bus-tie. Another contact on "27E" energizes timing relay "2". When timing relay "2" contact closes, after its preset elapsed time of 0.5 to 5.0 seconds, the emergency generator circuit breaker 52E will close connecting the emergency bus to the emergency generator. When voltage from the main switchboard has been restored to normal, the emergency loads may be manually transferred to the normal source by positioning 52ECS BREAKER CONTROL to trip and positioning SHIP SERVICE SWBD BUS TIE breaker (52N) to CLOSE. The emergency diesel engine is then manually stopped by positioning the "SIMPLEX" ENGINE CONTROL SWITCH (ACS) to OFF/RESET. TEST When selector switch "43" is held in TEST position, a contact will be opened which will remove voltage from undervoltage relay coil "27", simulating a loss of bus voltage. The SIMPLEX automatic starting system will start the emergency diesel and the emergency bus will be transferred to the emergency generator as described above. When selector switch "43" is allowed to return to the AUTO position, the emergency bus must be manually retransferred to the normal source as described above. MANUAL When Mode Selector Switch "43" is positioned to MANUAL, it disables the automatic bus transfer (ABT) and emergency diesel automatic starting functions. The emergency diesel can be started at the "SIMPLEX" by positioning the ENGINE CONTROL SWITCH (ECS) to RUN TEST or by placing the ECS switch to AUTO and starting the EDG by using the local start switch located on the EDG. When the EDG is started locally it is secured by positioning the ECS switch to OFF/RESET. Daniel Robson Chief Engineer

T/V KINGS POINTER Emergency Switchboard

Revised: 3/21/02 Page: 4

Emergency generator 52E may be closed by positioning BREAKER CONTROL 52ECS to CLOSE after manually opening SHIP SERVICE SWBD BUS TIE 52N. OFF All automatic functions are disabled and the emergency generator circuit breaker. In this mode the control power to the Ship's Service Switchboard Bus Tie breaker is disconnected. Therefore in this mode it is possible to back feed the ship's service switchboard from the emergency generator.

BACKFEEDING THE SHIP'S SERVICE SWITCHBOARD FROM THE EMERGENCY GENERATOR Backfeeding the 450v ship's service switchboard from the emergency diesel generator can by very useful during an emergency or critical mission situation. This is not a normal nor automatic procedure, and should be performed only after careful consideration. This procedure has been successfully used to maintain hotel and galley services. The EDG Mode Selector Switch 43 is normally left in AUTO and locked in this postion. Upon loss of ship's service power, the EDG will come on-line and supply power to the emergency loads. If the Cheif Engineer determines that additional ship's service loads are to be powered from the EDG, the following procedure should be adhered to: • Strip the Ship's Service Switchboard of any electrical load that is not required. Note: upon loss of ship's service power, LVP (low voltage protect) controllers automatically remove most of the electrical load from the switchboard, i.e., HVAC systems, auxiliary saltwater circulation pumps, A/C units, etc. • If the array winch is required for retrieval, backfeeding the Ship's Service Switchboard is not recommended. The Emergency Diesel Generator is rated for 250 KW, 450V, 320 amps. DO NOT EXCEED 320 AMPS. • At the Emergency Switchboard, position Mode Selector Switch 43 to OFF. The diesel should remain on-line. Reset and close the Ship's Service Switchboard Bus Tie breaker (52N). The EDG will now backfeed the Ship's Service Switchboard. • Most equipment normally powered from the Ship's Service Switchboard may now be operated, but care must be taken not to exceed the EDG rating of 250 KW 450V, 320 amps. The fuel oil purifier should be used to maintain the EDG service fuel tank.

NOTE !f the emergency generator is used to backfeed the ship's service Daniel Robson Chief Engineer

T/V KINGS POINTER Emergency Switchboard

Revised: 3/21/02 Page: 5

switchboard, under no circumstances should an attempt be made to parallel with either shore power or main diesel generator power.

MAINTENANCE Instrument Transformers Molded transformers may be cleaned by scrubbing the insulation with detergent and a stiff brush to remove accumulated dirt or oil film. Remove the detergent by washing with clean water. Apply a light grade of silicone oil to the surface if restoration of original surface appearance is desired.

Voltmeters, Ammeters, Wattmeters, Frequency Meters and Power Factor Meters To clean the various meter plastic windows, use soap and water. DO NOT USE CHEMICAL CLEANERS.

Pushbuttons CR2940 pushbuttons are used for various application, i.e., ground detector. Keep reasonably clean inside and out. If contacts become roughened by heating or arching, they should be smoothed with a fine file.

Type SB-1 Emergency Switchboard Control Device "43" Switch At regular intervals switches should be inspected for burning of contacts, for broken shunts on the moving contacts and for contact wear. If contacts are slightly pitted or coated with sulfide, scrape them gently with a sharp knife or dress with a fine file, such as a #00 dental file. If the shunts are broken or the contacts are badly pitted, they should be replaced.

Type SBM Voltmeter, Ammeter, Generator Breaker Control, Generator Heater, Synchronizing and Frequency Switches At regular intervals the switch contacts should be inspected for wear and burning. An opening at the bottom of the switch has been provided for this purpose. If contacts are slightly pitted or coated with sulfide, they should be cleaned with a flexible burnishing tool WARNING

Daniel Robson Chief Engineer

T/V KINGS POINTER Emergency Switchboard

Revised: 3/21/02 Page: 6

Since many of the parts of this switch are molded of a polycarbonate material, DD NOT use any lubricants and/or cleaning agents in any form (including aerosol sprays commonly available). Hydrocarbons (oils and related products may chemically attack such parts resulting in possible switch failure.

Emergency Switchboard Instantaneous Auxiliary Relay and Undervoltage Relay Due to the vital role of relays in the operation of a power system, it is important that a periodic test program be followed. It is recommended that the points listed under ACCEPTANCE TEST in G.E. INSTRUCTIONS GEH-1739E and GEI-90806, which is included in Volume 2 of G.E. Technical Manual for Ocean Surveillance Ship T-AGOS GEK-83187, be performed at an interval of from one to two years. For cleaning relay contacts a flexible burnishing tool should be used. This consists of a flexible strip of metal with an etched-roughened surface resembling in effect a superfine file. The polishing action is so delicate that no scratches are left, yet it will clean off any corrosion thoroughly and rapidly. Its flexibility ensures cleaning the actual points on contact. Do not use knives, files, abrasive paper or cloth of any kind to clean contact relays.

EMERGENCY GENERATOR AND SWITCHBOARD 2 2E. 27 27E 43 52E 52N 52ECS PB 83E AM VM AS VS WM FM CT PT TC TDC Daniel Robson Chief Engineer

Generator Breaker Close Timer Diesel Start Timer Normal Source Undervoltage Relay Emergency Source Undervoltage Relay Mode Selector Switch Emergency Generator Output Breaker Normal Source Circuit Breaker Generator Circuit Breaker Control Switch Generator Breaker Close Pushbutton Control Power Transfer Relay Ammeter Voltmeter Ammeter Switch Voltmeter Switch Wattmeter Frequency Meter Current Transformer Potential Transformer Trip Coil Time Delay Close T/V KINGS POINTER Emergency Switchboard

Revised: 3/21/02 Page: 7

TDE TDDE UVD TDUV

Daniel Robson Chief Engineer

Time Delay On Energization Time Delay De-energization Undervoltage Coil for Generator Breaker Time Delay Auxiliary Box

T/V KINGS POINTER Emergency Switchboard

Revised: 3/21/02 Page: 8

Daniel Robson Chief Engineer

T/V KINGS POINTER Emergency Switchboard

Revised: 3/21/02 Page: 9

Daniel Robson Chief Engineer

T/V KINGS POINTER Emergency Switchboard

Revised: 3/21/02 Page: 10

Daniel Robson Chief Engineer

T/V KINGS POINTER Emergency Switchboard

Revised: 3/21/02 Page: 11

Daniel Robson Chief Engineer

T/V KINGS POINTER Emergency Switchboard

Revised: 3/21/02 Page: 12

Daniel Robson Chief Engineer

T/V KINGS POINTER Emergency Switchboard

Revised: 3/21/02 Page: 13

450 VOLT EMERGENCY SWITCHBOARD

GENERAL INFORMATION The switchboard provides control, protection, and distribution of power at 450 VAC, 120 VAC to emergency loads within the vessel. The emergency switchboard also has a 24 VDC section used to supply Main Generator Diesel control voltage, Generator Engine Module "Cold Start" voltage, and Engine Order Telegraph "Current Failure Alarm" power. NOTE: When the cold start pushbutton is depressed a ground fault will appear on the ground detector lights at the 24 VDC section of the EDG switchboard and on the Main Diesel Control battery charger. This Is because this circuit uses hull ground as a return path. Therefore the Cold Start pushbutton should not be depressed except for testing and when In actual use.

The emergency switchboard is connected to the 450 volt ship's service switchboard through either of two bus tie breakers, I.e., either Port 1 X or Starboard 3Y.

DETAILED INFORMATION Switchboard Distribution 450 Volt AC Section • 52N & 52E Status Indicators • OPEN (amber) and CLOSE (blue) lamps • Main breaker 52E (1 ESG-4P). • S.S. Swbd. bus-tie 52N (P437). • Miscellaneous molded case feeder breakers: • EP401 - Bilge Pump #2 • EP402 - Submersible Pump Outlets • EP403 - Bow Thruster Seawater Cooling Pump • EP404 - Fire and Ballast Pump #2 • EP405 - SURTASS Array Emer. Winch • EP406 - Starting Air Compressor #1 • EP407 - Elextronic Power Panel Tranformer • EP408 - Steering Gear Pump #2 • EP409 - Emergency Lighting Panel, 120 Volt Transformer • EP41 0 - Emergency Switchboard Transformer 120V Daniel Robson Chief Engineer

T/V KINGS POINTER Emergency Switchboard

Revised: 3/21/02 Page: 14

• • • • • •

EP411 - SURTASS Array Winch EP412 - Spare P437 - Ship's Service SWBD Bus Tie (52N) Spare Spare Spare

The generator output breaker 52E (1 ESG-4P) receives power from the emergency generator when it is in operation. Power to the emergency switchboard is normally available through the SHIP SERVICE SWBD BUS-TIE 1T (52N, P437). NOTE Only one source of power at a time may be applied to the emergency switchboard.

120 Volt AC Section • EP110-1 - EDG Jacket Water Heaters • EP110-2 - Spare • EP110-3 - Array Power Panel • EP110-4 - EDG Battery Charger • EP110-5 - Emergency Lighting Panel • EP110-6 - Spare • EP110-7 - Emergency Lighting Panel • EP110-8A - Emergency Lighting Panel • EP110-9 - Emergency Lighting Panel • EP110-10 -MCSC (Emergency Power source) • EP110-11 - WSC-6 Unit #5 • EP110-12 -DC Switchboard Battery Charger (24 VDC Section)

24 Volt DC Section • • • • • •

P024-1 - Main Generator #1 Control 24 VDC (including Cold Start) P024-2 - Main Generator #2 Control 24 VDC (including Cold Start) P024-3 - Main Generator #3 Control 24 VDC (including Cold Start) P024-4 - Main Generator #4 Control 24 VDC (including Cold Start) P024-5 - Spare P024-6 -'Current Failure Alarm (' Engine Order Telegraph)

The 24 VDC emergency switchboard is served by the 120 VAC emergency switchboard via circuit breaker 3U (DC SWBD BATTERY CHARGER)

Daniel Robson Chief Engineer

T/V KINGS POINTER Emergency Switchboard

Revised: 3/21/02 Page: 15

The molded case feeder breakers are manually operated though most are normally left in the CLOSED position. The ship service switchboard bus-tie breaker 52N is interlocked with the emergency switchboard ABT. The emergency switchboard ABT consists of the Mode Selector Switch (device 43), 52E, and various relays located in and beneath the switchboard instrumentation and control panel. In the event of power failure (85% of normal voltage) on the 450 Volt Ship's Service Bus, the emergency generator automatically starts, bus-tie breaker 52N automatically opens (disconnecting the Ship's Service bus and emergency bus) and breaker 52E closes to connect the emergency generator output to the emergency bus and it's loss. Once the ship's service power has been restored to the ship's service switchboard normal operation can be restored by manually reconnecting the emergency loads to the ship's service bus via 52N and manually shutting down the emergency diesel.

Daniel Robson Chief Engineer

T/V KINGS POINTER Emergency Switchboard

Revised: 3/21/02 Page: 16

Daniel Robson Chief Engineer

T/V KINGS POINTER Emergency Switchboard

Revised: 3/21/02 Page: 17

Daniel Robson Chief Engineer

T/V KINGS POINTER Emergency Switchboard

Revised: 3/21/02 Page: 18

Daniel Robson Chief Engineer

T/V KINGS POINTER Emergency Switchboard

Revised: 3/21/02 Page: 19

Generator Output Broker - 52E General Electric type AKR - 4A - 30 - 400 amp frame marine drawout with door closed -Solid State overcurrent trip device. This circuit breaker is of the drawout type with the switchboard compartment closed. As the compartment door is mounted on the switchboard frame, the breaker has a deep telescoping escutcheon, which allows the breaker to be disconnected. There are four breaker positions. CONNECTED Breaker is fully inserted in the compartment with the power and control disconnects fully engaged. The breaker must be tripped to rack into or out of this position. TEST Power and control disconnects are disengaged, but the secondary control disconnects are engaged to permit breaker operation without energizing the power circuit. DISCONNECTED All disconnects are disengaged. WITHDRAWN With the compartment door open and the breaker fully extended out on the side track extension, the breaker can be lifted off the tracks. Two protruding pins on each side of the breaker can drop into slots on the slide rails to properly position the breaker for racking in or out. Breaker position in connected - test - disconnected is indicated by markings on the left and right sides of the escutcheon.

BREAKER REMOVAL 1. Trip the breaker and open the door. 2. Insert the racking handle into the racking screw opening and rotate counterclockwise to move the breaker from CONNECTED through TEST to the DISCONNECTED position, where the jack screw mechanically stops. The breaker closing spring will be discharged automatically a few turns before the end of the racking action. 3. Pull the breaker out on the track as far as it will go. 4. Release the track locks and then pull the breaker out on the slide rail extension until it is fully extended. Daniel Robson Chief Engineer

T/V KINGS POINTER Emergency Switchboard

Revised: 3/21/02 Page: 20

5. Before lifting the breaker off the track, verify the breaker is open and the spring is discharged. 6. Due to the weight of the breaker a suitable lifting rig with spreader bar should be used. Hoist the breaker until the side pins dear the track slots, swing the breaker forward until the primary disconnects clear the compartment. Lower the breaker onto a flat surface with no objects that could damage the internal mechanism. INSERTING THE BREAKER 1. Before lifting the breaker, insure that the racking cams on the breaker are properly positioned for engaging the pins in the compartment. To do this, ascertain the racking screw is fully counterclockwise. Also, insure that the breaker is open. 2. With the lifting rig and spreader bar, raise the breaker above the elevation of the tracks and extend the tracks fully. 3. Slowly lower and guide the breaker so that the mounting pins drop into the racks. Remove the lifting assembly. 4. Push the breaker into the compartment until it reaches the track stops. This is the DISCONNECT position where the breaker racking arms are positioned to engage the compartment racking pins. 5. Insert the racking handle into the racking screw opening in the escutcheon and rotate clockwise. The breaker will travel through the TEST position to the CONNECTED position where the jackscrew mechanically stops. NOTE If control power Is available, the charging motor will charge the closing spring when the breaker reaches the TEST position. MAINTENANCE Generator Output Breaker Clean Lubricate and Inspect Periodic inspection, lubrication and operation of the breaker is recommended to assure reliable performance. Under normal conditions an annual inspection is suggested, though more frequent operation is recommended to maintain the mechanism free and lubricated. After the breaker has been de-energized manually and electrically operate the breaker several times, checking for obstructions or excessive friction and insure the electrical attachments function properly. Daniel Robson Chief Engineer

T/V KINGS POINTER Emergency Switchboard

Revised: 3/21/02 Page: 21

With the breaker removed from the compartment, or in fully withdrawn position on the racks, visually inspect the breaker for loose hardware. Also, check the bottom of the compartment for hardware that has fallen from the breaker. Remove the arc quenchers from the breaker to inspect the arc quencher barriers and contacts for breaking or excessive burning. Should are quencher barriers or contacts be eroded to half their original thickness they should be replaced. Inspect the breaker arcing tips and main contacts for burning or damage. A thin film of contact lubricant should be applied to the main contacts only, before remounting the arc quenchers. Inspect insulating parts for any evidence of overheating, damage or thermal aging. Bearing points and sliding surfaces should be lightly lubricated with a thin film of Mobil GE Lubricant D50H15. The disconnect studs should be cleaned and greased with GE D50H47. Use kerosene to remove hardened grease and dirt from latch and bearing surfaces. Performance of the solid state trip device (Micro VersaTrip) can be checked with the test unit specifically designed for this purpose. (GE Test Set TVTS-1). With the breaker racked in to the TEST position and control power available with the generator running, the spring charging motor will charge the closing spring. The breaker may now be closed and tripped electrically to check operation of the mechanism and auxiliary circuits.

CLEAN AND INSPECT EMERGENCY SWITCHBOARD OBJECTIVE: Establish procedure for cleaning and inspecting switchboards. TOOLS AND EQUIPMENT: Standard mechanics tools, AC/DC volt/ohmmeter, clean dry rags, vacuum cleaner. GENERAL INFORMATION AND INSTRUCTIONS: This procedure should be used in conjunction with switchboard insulation resistance measurement operation sheets. REFERENCES: G.E. Manual GEK-83187 Volume 1 & 2 TBC Drawing No. 320-0000301 READ THIS BEFORE PROCEEDING Daniel Robson Chief Engineer

T/V KINGS POINTER Emergency Switchboard

Revised: 3/21/02 Page: 22

PRECAUTIONS: Observe all standard safety precautions associated with electrical and mechanical equipment. WARNING De-energize equipment completely before attempting any work on connections, buses, cables or wires. This Includes de-energizing any connections to outside primary or secondary sources, such as transformers, tie lines, space heaters, alarm circuits, etc.

Power Sources to the Emergency Switchboards • Auto start panel - set too off/reset. • Port emergency bus tie breaker - open. • Starboard emergency bus tie breaker - open. • Emergency generator space heater breaker - open L128-1 P. • Emergency diesel start batteries - disconnected. • Emergency 24 volt switchboard supply battery breaker-open P024-7. • MCSC 105 volt power supply breaker- open MCSC power panel CB 5.

OPERATION STEPS

KEY POINTS

1.

Verify power is off with an AC/DC volt meter.

Using the power sources to switchboards above, de-energize all sources of power'to the switchboard to be cleaned.

2. On the EDG switchboard, rack generator breaker out to clean the breaker and breaker. compartment

See AKR breaker information sheet for racking instructions Section III pg. 23-7

3. Thoroughly clean components located within switchboard compartments. Use a vacuum cleaner and clean dry rags only.

Do not use compressed air or cleaning solvents.

4. Inspect buses and connections for signs of overheating, due to poor connections. Daniel Robson Chief Engineer

T/V KINGS POINTER Emergency Switchboard

Revised: 3/21/02 Page: 23

5. Check all bus connection, bus mounting, and bus bracing bolts for tightness. 6. Check all control wiring connections for tightness. 7. Inspect compartment floors for loose hardware. 8. Proceed with insulation resistance measurement operations. 9. Replace all protective covers

450 VOLT EMERGENCY SWITCHBOARD INSULATION RESISTANCE MEASUREMENT

OBJECTIVE: Establish a procedures for taking insulation resistance measurements of the 450 volt emergency switchboard.

TOOLS AND EQUIPMENT: 500 volt megger, AC/DC Volt Ohmmeter, 40°C insulation resistance correction factor chart.

GENERAL INFORMATION AND INSTRUCTIONS: Duration of application of an insulation resistance test potential should be one minute with readings taken at the end of the one minute test. A correction factor must be used to bring readings to a 40°C value (see Section III Appendix A). Insulation resistance readings should be permanently recorded for future trend analysis.

REFERENCES: G.E. Manual GEK 83187, Volume 2 TBC Drawing 320-0000301, Sheet 2

READ THIS BEFORE PROCEEDING PRECAUTIONS: Daniel Robson Chief Engineer

T/V KINGS POINTER Emergency Switchboard

Revised: 3/21/02 Page: 24

Observe all normal safety precautions associated with electrical and mechanical equipment. WARNING De-energize equipment completely before attempting any work on connections, buses, cables or wires. This includes de-energizing any connections to outside primary or secondary sources, such as transformers, tie lines, space heaters, alarm circuits, etc. Power Sources to the Emergency Switchboards • Auto start panel - set too off/reset. • Part emergency bus tie breaker- open. • Starboard emergency bus tie breaker - open. • Emergency generator space heater breaker - open Li 28-1 P. • Emergency diesel start batteries - disconnected. • Emergency 24 volt switchboard supply battery breaker - open P024-7. • MCSC 105 volt power supply breaker - open MCSC. power panel CB 5. OPERATION STEPS 1. Using the power sources to switchboards information above, de-energize all sources of power to the 450 volt emergency switchboard.

KEY POINTS Verify power is off with an AC/DC volt meter.

2.

Open all feeder circuit breakers on the 450 volt emergency switchboard.

Isolate buses from feeder cables and loads.

3.

At the emergency generator control section,remove fuses FP and PN.

Disconnects instrumentation tranformer and ground detection lamp.

4.

Connect megger leads to test the 450 volt emergency switchboard to hull ground at 500 volts.

5.

Record readings after one minute of megger potential application.

Daniel Robson Chief Engineer

T/V KINGS POINTER Emergency Switchboard

Megger readings will usually start low and then increase during the one minute period.

Revised: 3/21/02 Page: 25

6.

Record bus compartment temperature at the time insulation resistance test is performed.

This information is used in converting the megger readings to 40°C.

7. Utilizing megger readings and temperatures originally obtained and the 40°C insulation resistance correction factor chart, calculate and record readings for future trend analysis (see Section III Appendix Ay. 8.

Replace fuses FP and FN.

9.

Replace all covers before re-energizing switchboard.

120 VAC AND 24VDC EMERGENCY SWITCHBOARD INSULATION RESISTANCE MEASUREMENT

OBJECTIVE: Establish a procedures for taking insulation resistance measurements of the 120 VAC 24VDC emergency switchboards.

TOOLS AND EQUIPMENT: 500 volt megger, AC/DC Volt Ohmeter, 40°C insulation resistance correction factor chart.

GENERAL INFORMATION AND INSTRUCTIONS: Duration of application of an insulation resistance test potential should be one minute with readings taken at the end of the one minute test. A correction factor must be used to bring readings to a 40°C value (see Section III Appendix Aj. Insulation resistance readings should be permanently recorded for future trend analysis.

REFERENCES: G.E. Manual GEK 83187, Volume 2 TBC Drawing 320-0000301, Sheet 2

READ THIS BEFORE PROCEEDING PRECAUTIONS: Daniel Robson Chief Engineer

T/V KINGS POINTER Emergency Switchboard

Revised: 3/21/02 Page: 26

Observe all normal safety precautions associated with electrical and mechanical equipment. WARNING De-energize equipment completely before attempting any work on connections, buses, cables or wires. This includes de-energizing any connections to outside primary or secondary sources, such as transformers, tie lines, space heaters, alarm circuits, eta

Power Sources to the Emergency Switchboards • Auto start panel - set too off/reset. • Port emergency bus tie breaker - open. • Starboard emergency bus tie breaker- open. • Emergency generator space heater breaker- open L128-1 P. • Emergency diesel start batteries - disconnected. • Emergency 24 volt switchboard supply battery breaker- open P024-7. • MCSC 105 volt power supply breaker - open MCSC power panel CB 5.

OPERATION STEPS 1. At the 450 volt emergency switchboard, volt open EP 410.

KEY POINTS De-energizes 450/120 transformer supplying 120 volt A.C. emergency switchboard.

2.

Open all feeder circuit breakers on the 120 volt A.C. and 24 volt D.C. switchboards.

Isolates buses from feeder cables and loads.

3.

At the rear of the 120 VAC/24 VDC switchboard, remove fuses for ground detection lamps on both buses.

4.

Connect megger leads to test the buses to hull ground at 500 volts.

5.

Record readings after one minute of megger potential application.

Megger readings will usually start low and then increase during the one minute period.

6.

Record bus compartment

This information is used

Daniel Robson Chief Engineer

T/V KINGS POINTER Emergency Switchboard

Revised: 3/21/02 Page: 27

temperature at the time the insulation resistance test is performed.

in converting the megger readings to 40°C.

7. Utilizing megger readings and temperature originally obtained and the 40°C insulation resistance correction factor chart, calculate and record readings for future trend analysis (see Section III Appendix A).

8.

Replace fuses for ground detection lamps.

9.

Replace all covers before re-energizing switchboard.

Daniel Robson Chief Engineer

T/V KINGS POINTER Emergency Switchboard

Revised: 3/21/02 Page: 28