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| Electrical O&M Manual | Project XXXXX |

4 OPERATING PROCEDURES

4 OPERATING PROCEDURES........................................................................................................... 1

4.1 INTRODUCTION.............................................................................................................................................................................24.2 SAFETY PROCEDURES................................................................................................................................................................3

4.3 PERMITS TO WORK......................................................................................................................................................................4

4.4 EMERGENCY PROCEDURES.................................................................................................................................................. ....4

4.5 MANUFACTURERS RECOMMENDATIONS.................................................................................................................................4

4.6 LV SWITCHBOARDS.....................................................................................................................................................................5

4.6.1 START UP PROCEDURES.........................................................................................................................................5

4.6.2 NORMAL OPERATION................................................................................................................................................6

4.6.3 EMERGENCY OPERATION........................................................................................................................................7

4.6.4 SHUT DOWN...............................................................................................................................................................7

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Section: 4

OPERATING PROCEDURES

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4.1 INTRODUCTION

This Section of the Manual provides routine operating information for the system installed. Nature of

the installation is such that other than the initial operation of dead circuits, there are only a few tasks

to perform on a regular basis.The services to the premises will have been energised and set to work with tests carried out to ensure

its correct operation and function particularly with regard to safety systems and interlocks.

These Operating routines should only be carried out by trained and competent personnel who have

an understanding of the systems being energised and its implication on other related systems.

When operating and setting equipment and systems a systematic approach must be taken. Therefore

it is essential that the operative understand the system controls and settings at each stage of

operation, so that they can properly react to any unexpected or unforeseen condition and take the

appropriate action.

The manufacturers manuals and literature must be consulted and referenced to ensure that routines

are followed particularly if there is an unexpected loss or supply or service.

For Specialist systems detailed in this Section as a minimum the authorised user should ensure the

following operations and system information is available, noted and followed:

User Pass Codes.

Engineer Pass codes.

Reporting of any faults, incidents or system alterations.

Ensuring system is tested and maintained in compliance with the relevant legislation,

Codes of Practice, Fire Authority or Insurance Company requirements.

Record keeping of any events.

Emergency Contact Numbers.


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4.2 SAFETY PROCEDURES

The following is a brief guide to the procedures that can be generally adopted minimise the risk to

authorised personnel as well as protecting plant and equipment from damage.

WARNING HV & LV SWITCHGEAR CARRIES VOLTAGES WHICH ARE LETHAL & MUST ONLY

BE OPERATED BY AUTHORISED COMPETENT PERSONS.

Access to switch rooms and electrical distribution equipment should be restricted to authorised,

trained and competent personnel who are likely to be engineering staff or qualified personnel working

under the control of the engineering staff. Works in the HV Switchrooms to be only carried out by

authorized and competent persons appointed by a qualified HV engineer.

Prior to switching on a circuit check that the equipment or outlets served to ensure equipment andswitchgear are serviceable and safe to operate. If the circuit has unexpectedly stopped operating then

ensure the fault-finding routines are followed. DO NOT switch or replace the protective device as not

only can this endanger lives but this may cause further damage to the systems or equipment served.

When switchgear, distribution boards, or any other item of plant or equipment is out of service,

unserviceable or unsafe, the item in question must be electrically isolated. All fused switches, circuit

protective devices etc., must be switched off and a suitable warning notice fixed in place.

There are generator backed up power supplies which have automatic changeovers in the Event of

power loss, therefore every source of supply must be isolated and prior to working on equipment.

Secondary power supply systems are provided by generators, battery backup for emergency lighting,

fire alarms, access control systems and intruder alarm systems, must have all sources of supply

isolated and prior to working on equipment. Remote isolation for equipment must be locked off to

prevent unauthorised or inadvertent re-energisation of power.

1. Check to ensure that switch rooms, and plant areas are clean and free from obstruction.

2. Check to ensure all equipment is properly secured, equipment covers and guards are in place.

3. Check to ensure that all equipment access panels and doors are closed and secured.

4. Ensure that all tools and safety equipment are serviceable and in their proper space.

5. Check that fire-extinguishers are in place and have been serviced.

6. Check that fire-extinguishing systems are serviceable.


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4.3 PERMITS TO WORK

A permit to work will be required when maintenance work can only be carried out if, after carrying out

a suitable risk assessment, normal safe working practices cannot be followed.

A permit to work system usually comprises of a written document which specifies the extent of the

works, precautions to be taken and anticipated timescale.The document will usually need to be signed by a suitably experienced and qualified senior member

of the employers staff.

4.4 EMERGENCY PROCEDURES

The emergency procedures are intended as a guide only, for each emergency situation that arises

has to be taken in the light of its degree of severity and the conditions prevailing at the time.

Never take risks in an emergency, for a risk can turn a minor emergency into a major one. The safety

of personnel must always come first.

Any temporary repairs effected or arrangements made during or after an emergency must becorrected as soon as it is practically possible.

The emergency procedures are intended as a guide only, for each emergency situation that arises

has to be taken in the light of its degree of severity and the conditions prevailing at the time.

4.5 MANUFACTURERS RECOMMENDATIONS

Where the following schedules refer to specific manufacturers operation or fault finding

recommendations then reference must be made to the referenced documents located within Section 7

of this manual.


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4.6 LV SWITCHBOARDS

A substation has been provided on site by Scottish and Southern Energy (S&SE). The substation is

located in a reinforced section of the Energy Centre at Ground Floor Level. LV supply cabling has

been installed from the transformer LV cabinet in the substation to the LV switch panel located in the

adjacent room of the Energy Centre allocated as the main LV switchroom.

4.6.1 START UP PROCEDURES

Prior to switching on for the first time or following a long period of shut down, it will be necessary to

carry out a general inspection of the LV Switchboard following the manufacturers literature

recommendations located in Section 7 of this manual to ensure they are safe and suitable to operate.

1. Ensure power is available to both sides of the LV Switchboard via the HV/LV

Transformers.

2. Visually inspect the HV switches on the transformers. The upper mechanism has two

operating springs; one for closing and one for opening. Both springs are charged inone operation. Open and Close the circuit breakers by operating the mechanical push

buttons.

3. The lower mechanism operates the earth switch. There is a mechanical interlock

between these two mechanisms which prevents operating of the disconnector and

earthing switch when the circuit breaker is in closed position. When the earthing switch

is in closed position it will be impossible to operate the disconnector, but the circuit

breaker can be closed for testing purpose.

4. Once the transformers have been connected to the H.V. mains voltage will be applied

in a non-load state and observed for one hour. No anomalies should occur during this

period of time.

5. After storage or disconnection for a longer period, it is recommendable to connect the

transformer during four hours in no-load in order to dehumidify through core heating.

After this period it can be put into a normal operation.

6. The voltage will be measured at the L.V. terminals to check the corresponding output

voltage depending on the transformation ratio.

7. Apply the load progressively until the rated power is reached and check the increase in

temperature.

8. Check the transformer temperature monitoring system.

9. Ensure LV ACB is in the OFF position.


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10. Close the earth switch to the HV switch.

11. Close the incoming HV switch using the pushbuttons.

12. Check the HV switch position indicators denote the status as ON.

13. Voltage should be applied to the Transformer for 1-4 hours with no load to ensure no

anomalies occur.

14. Check LV voltages at transformer LV terminals and apply LV load progressively and

monitor increase in temperature.

15. Visually inspect LV switchboard and ensure all outgoing devices are open. Check

settings/ratings of outgoing devices.

16. The main ACB is motorised and will automatically recharge after each closing. Check

the unit shows a charge and OK display.

17. Press the button to close the ACB.

18. Check metering shows voltage is present.

19. Close the outgoing ACBs or MCCBs serving the LV equipment.

20. Check surge protection device visual indicator shows normal.

21. Check earth fault relay unit LED show a healthy condition (GREEN).

22. Confirm the meter readings and breaker status indication is correct on the BMS PC.

4.6.2 NORMAL OPERATION

The main LV Panel has an essential and non-essential side, the non essential side will drop out when

the main incoming breaker detects undervoltage, and motorised MCCB's controlled and monitored by

the BMS, will enable progressive loading of the switchboard as the generator starts up or the main

supply comes live.

The main LV panel has the facility to have a mobile generator connected to in the event of power

failure. Cabling has been installed from the LV Switch room to the mobile generator location and a

mobile generator connection pillar has been installed for connection of an 800kVA unit.

The generator will not automatically power up but can manually switched by the client. Essential and

non essential services are detailed on the main LV Schematic drawing XXXXX, with motorisedMCCBs annotated together with BMS connections. The Main Building will remain fully operational

when the mobile generator is the main power source.


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4.6.3 EMERGENCY OPERATION

1. An EPO button is provided to the LV switchboard located in the LV Switchroom. In the event of

the LV ACB or HV VCB being tripped due to operation of the EPO button, transformer high

temperature cut-out or restricted earth fault relay operating, the COMMON TRIP reset button

will need to be reset before the HV VCB or LV ACB can be reset.

2. The EPO buttons will when pressed lock in the depressed position.

3. Once the cause of the emergency has been resolved, the EPO button head can be released

by twisting and unlocking the head.

4. The HV VCB and LV ACB can then be reset and switched on as described previously.

5. The opening spring of the HV VCB is always charged when the circuit breaker is in closed

position and will then be ready to open immediately if the protection relay gives a trip signal.

However a quick reclosing is not possible. If the mechanism is equipped with a motor

operation a reclosing will take approx. 10 seconds.

NOTE: THE COMMON TRIP BUTTON MUST NOT BE OPERATED UNTIL THE

CAUSE OF THE FAULT HAS BEEN INVESTIGATED AND RECTIFIED.

6. The surge protection device will operate in the event of a high voltage surge typically caused

by lightning. The unit will need to be reset following the manufacturers instruction manual.

7. The restricted stabilized earth fault current relay that provides zero-current differential

protection of the star point winding (restricted earth fault) of a transformer. The output is

monitored by the EMS. The unit will need to be reset after the cause of the earth fault has

been rectified.

8. The ACBs are provided with microelectronic control units providing visual indication of fault

currents, overloads and under voltage and will need to be reset as described in the MerlinGerin literature, after the fault has been rectified. The ACB can then be manually reset

following the procedure described above.

9. The MCCBs are provided with either thermal-magnetic (TM) or electronic (STR22SE) trip

units. The units protect against fault currents and overloads and will need to be reset

manually, after the cause of the fault has been rectified.

4.6.4 SHUT DOWN

To totally shut down LV switchboard and relevant electrical supplies served by that switchboard:1. Switch Generator Controls from the AUTO to OFF position to ensure they do not start.

2. Ensure all electrical loads (e.g. LV systems and equipment) have been switched off in a

controlled manner.

3. Open the Incoming LV ACB using the button. The LV side and transformer load is isolated.

Remove control fuse or Open the HV VCB.

4. Open the HV VCB Main switch to isolate the HV side of the Transformer.

5. Refer to the manufacturers literature for switching off the relevant protective devices.


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