ABB SAHARA Series Manual de usuario

PTMV - Medium Voltage Equipment

ABB Electrical Industries Co. Ltd.

Kingdom of Saudi Arabia

ABB

SAHARA Series

Compact Substation

OPERATING INSTRUCTIONS

MODELS:

24kV 36kV

SAHARA 500 SAHARA MAX-1

SAHARA 1000 SAHARA MAX-2

SAHARA 1600

SAHARA 2000

SAHARA 3000

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Table of Contents

INTRODUCTION.................................................................................................................................... 3

GENERAL................................................................................................................................................3

RECEIVING/INSPECTION/STORAGE ..............................................................................................4

PERSONNEL SAFETY ..........................................................................................................................4

VENTILATION .......................................................................................................................................4

EARTHING..............................................................................................................................................4

HANDLING .............................................................................................................................................4

SAFETY NOTES FOR OPERATIONS ................................................................................................5

INSTALLATIONS...................................................................................................................................5

CONNECTIONS......................................................................................................................................5

Tap connections .........................................................................................................................6

Cable Connections .....................................................................................................................6

FINAL INSPECTION PRIOR TO ENERGIZATION ........................................................................6

Electrical Inspection .................................................................................................................. 6

Mechanical Inspection............................................................................................................... 7

MAINTENANCE AND PERIODIC INSPECTION............................................................................. 7

Bolt Tightness.............................................................................................................................7

Inspection and Testing ..............................................................................................................7

Routine Field Testing ................................................................................................................8

1. Insulation Resistance Test ...................................................................................8

2. Connection Test....................................................................................................9

3. Mechanical Operation..........................................................................................9

TRANSFORMER MAINTENANCE.....................................................................................................9

Inspection during operation......................................................................................................9

Maintenance during operation .................................................................................................9

Inspection and Measures to be taken during downtime ........................................................9

Inspection of oil leaks and precautions to be taken..................................................9

Inspection Measurements .........................................................................................................10

Opening/Resealing Sealed type Transformers ........................................................................ 10

FUSE REPLACEMENT PROCEDURE ............................................................................................... 11

LOW VOLTAGE CIRCUIT BREAKER MAINTENANCE .............................................................. 11

General ....................................................................................................................................... 12

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INTRODUCTION

The product to which this manual refers should be installed, commissioned, operated and maintained

under the supervision of a competent Electrical Engineer in accordance ith elevant tatutory

requirements and good engineering practice, including Codes of Practice where applicable, and properly

used within the terms of the specification.

The instructions in this manual should familiarize qualified personal with the proper procedures to keep

all new unit(s) in proper operating condition. These instructions for installation, operation and

maintenance of Package Compact Substation should be read carefully and used as a guide during

installation and initial operation.

These instructions do not propose to cover all details or variations in equipment, nor to provide for every

contingency to be met in connection with installation, operation, or maintenance. Should further

information be desired, or particular problems arise which are not covered, please contact the nearest

ABB office.

We would in particular stress the importance of care in:

•Site selection and design, embodying features that provide adequate ventilation, protection and

security and which have taken account of appropriate fire, moisture and explosion hazards.

•Jointing.

•Earthing.

•Selection and setting of electrical protection in primary and secondary, against overload,

overvoltage and short-circuit.

•Carrying out regular inspection and electrical and mechanical maintenance.

The Package Compact Substation(s) covered by these instructions have been repeatedly nspected nd

tested to meet all applicable standards of IEC, to ensure you of a first-rate quality product, which should

give many years of satisfactory performance.

The specific ratings of each Package Compact Substation are shown on the drawings.

File these instructions in a readily accessible place together with drawings and descriptive ata f he

Package Compact Substation. These instructions will be a guide to proper maintenance of the equipment

and prolong its life and usefulness.

GENERAL

These Package Compact Substations are locally manufactured in the Kingdom of Saudi Arabia by ABB

Electrical Industries Co. Ltd., part of the ABB group world-wide to meet the environmental conditions

of the Kingdom, neighboring Gulf countries and other similar places for outdoor installations.

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The Package Compact Substations are completely self-contained, mounted on an integral base, factory

assembled in a totally enclosed, aesthetically and acceptable cladding, vandal-proof, vermin-proof and

weather-proof housing ready for installation into position on a concrete base pad or pier.

The base frame is of welded structural steel and been hot-dipped galvanized after fabrication to assure

affective corrosion resistance in service.

Housing of the Package Compact Substation is made of special material called ALUZINK, a sheet steel

with a metallic alloy coating. The alloy consists of 55% aluminum and 43.4% zinc. This provides

optimum corrosion protection.

The housing has three compartments, separated with ALUZINK sheet. The transformer compartment is

completely separated from the medium voltage and low voltage compartments.

RECEIVING / INSPECTION / STORAGE

The Package Compact Substation is shipped from the factory ready for installation on site. It has been

submitted to all normal routine tests before being shipped, and it is not required to do any voltage testing

before putting it into service, provided the substation has not sustained any damage during transportation.

Immediately upon receipt of the Package Compact Substation, examine them to determine if any damage

or loss was sustained during transit. If abuse or rough handling is evident, file a damage claim with carrier

and promptly notify the nearest ABB office. ABB ELECTRICAL INDUSTRIES CO. LTD. is not

responsible for damage of goods after delivery to the carrier; however, we will lend assistance if notified

of claims.

PERSONNEL SAFETY

The first and most important requirements are the protection against contact with live parts during normal

service as well as maintenance or modifications.

This is the reason why all live parts have been metal enclosed, so that when the parts are live and the

Package Compact Substation doors are open, no one can be able to touch them.

Also, it is safe in case any short-circuiting or sparking occurs at the busbars.

VENTILATION

Transformer compartment has been provided with sand trap louvers, to prevent ingress of sand and that

proper air circulation should take place.

EARTHING

Proper earthing busbar has been provided.

HANDLING

Lifting lugs has been provided on top of four corners of the housing for lifting the DPS by crane and

chains as a single unit, otherwise this can be done by a forklift of sufficient capacity, but the lifting fork

must be positioned under the transformer portion.

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INSTALLATIONS

A clean, flat surface capable of supporting the Package Compact Substation unit weight is the

only requirement for a foundation. It is, however, important that adequate accessibility,

ventilation and ease of inspection of the unit must be provided.

In all installation work, the safety regulations for electrical installations have to be observed.

CONNECTIONS

Each Package Compact Substation must be permanently grounded or earthed by connecting an

affective recognised ground or earth as prescribed by the latest applicable edition of IEC or

ANSI requirements.

The Package Compact Substation is designed to operate with a solidly grounded neutral system.

The neutral connection should be solidly and permanently grounded.

Tap connections

SAFETY NOTES FOR OPERATIONS

1. DO NOT LIFT OR MOVE A TRANSFORMER OR PACKAGE COMPACT

SUBSTATION WITHOUT ADEQUATE EQUIPMENT AND PRECAUTIONS.

2. TERMINALS ARE FOR ELECTRICAL LOADING ONLY.

3. DO NOT MAKE ANY CONNECTIONS THAT ARE NOT AUTHORIZED BY THE

NAMEPLATE OR CONNECTION DIAGRAMS.

4. DO NOT ENERGIZE THE SUBSTATION WITHOUT PROPERLY MADE GROUND

OR EARTH CONNECTIONS.

5. DO NOT ATTEMPT TO CHANGE THE TAP SETTINGS WHILE THE

TRANSFORMER IS ENERGIZED FROM EITHER THE HIGH VOLTAGE OR LOW

VOLTAGE SIDE.

6. DO NOT CHANGE CONNECTIONS OF A TRANSFORMER THAT IS UNDER

EXCITATION.

7. DO NOT TAMPER WITH INTERLOCKS, ALARM AND CONTROL CIRCUIT.

8. DO NOT REMOVE COVER PLATES OR ACCESSORIES WHILE THE SUBSTATION

IS ENERGIZED.

WARNING WARNING WARNING WARNING WARNING WARNING

BEFORE ENERGIZING OR PLACING ANY UNIT INTO SERVICE AFTER EXTENDED

STORAGE, A CHECK OF THE INSULATION RESISTANCE

SHOULD BE MADE.

WARNING WARNING WARNING WARNING WARNING WARNING

A POOR GROUND OR EARTHING MAY RESULT IN LOSS OF LIFE OR

DAMAGE TO THE EQUIPMENT. AN EFFECTIVE LOW RESISTANCE

GROUND IS ESSENTIAL FOR PROPER OPERATION.

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All units have taps located in the High Voltage winding. The tap arrangement is shown on the nameplate

of the transformer. These taps are provided to furnish rated output voltage when the input voltage differs

from the rated voltage.

To change tap connections, do the following steps:

1. De-energized the unit, short-circuit both the high and low voltage connections and ground both

sides.

2. Unlock the tap changer handle, and then move the taps changer handle to the desired tap, then

locked the tap changer handle.

3. Remove safety shorts and ground connections from the high voltage and low voltage buses.

After ensuring that no tools or hardware was left in the enclosure, and the enclosures are closed properly,

you may then re-energize the Package Compact Substation. Make sure that the tap connections are proper

for the required voltage as listed on the nameplate. The transformer is normally shipped with the tap

changer for the rated voltage.

Cable Connections

When making outside cable connections, conductors suitable for at least 85°C should be used. All

connections should be made without placing undue stress on the terminals.

Conductors should be securely fastened in place and adequately supported with allowances for expansion

and contraction.

FINAL INSPECTION PRIOR TO ENERGIZATION

After the Package Compact Substation has been found to be in good condition and the protective

equipment is operational, the substation may be connected to the network. However, it is recommended

that the transformer to be left to settle for 1 or 2 days after installation so those air bubbles in the oil have

time to dissolve before connecting the voltage.

Before energizing the unit, a complete electrical inspection should be made. The following checklist

should be used as a minimum requirement.

Electrical Inspection

[ ] All external connections have been made properly (phasing of connections to terminals, etc.).

[ ] All connections are tight and secure.

[ ] All accessory circuits are operational. Check the transformer protective equipment and test the

function of their electrical circuits:

•Thermometers (alarms, tripping)

•Pressure relay (tripping)

•Oil level indicator

•Ensure that all fuses are inserted and in the correct position

[ ] All tap connections are properly positioned.

[ ] The neutral and ground connections have been properly made.

Mechanical Inspection

WARNING WARNING WARNING WARNING WARNING WARNING

TAP CONNECTIONS MAY BE CHANGED ONLY WHEN THE UNIT IS

TOTALLY DE-ENERGIZED.

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[ ] All shipping members have been removed.

[ ] There is no obstructions in or near the openings for ventilation.

[ ] No tools or other articles are left inside the enclosures.

[ ] All protective covers are in place or closed and bolted tight.

MAINTENANCE AND PERIODIC INSPECTION

In order to assure a long lifetime and correct and reliable operation of equipment delivered for this facility

it is of utmost importance to perform maintenance regularly.

Following general rules should always be considered before starting maintenance activity.

1. Authority from responsible engineer shall always be obtained before starting any maintenance.

2. Follow safety procedure established in carrying out the work.

Realize that no set of safety or maintenance instructions will ever be written that can adequately cover all

accident possibilities.

Therefore "SAFETY" as dictated by actual current conditions, always takes precedence over any

previously prepared safety or maintenance instructions. Assume nothing. Take the precautions that you

personally deem necessary in addition to those included in standard practice.

•Be familiar with the drawings and previous test records before starting activity.

•Scrutinize maintenance instructions given for the equipment to be maintained.

Maintenance information is given in the Operation and Maintenance Manual for each type of equipment.

The main dangers of such process are:

•Inaccessible lubrication points (greased for life) cannot be lubricated and may seize up.

•Areas not lubricated may be subject to corrosion.

•The high-pressure spray may damage equipment.

•Especially protective coatings may be removed.

Bolt Tightness

All connections should be tight and secure. Bolts and nuts on busbar and terminal lugs should be

torqued and marked properly.

Inspection and Testing

The need for preventive maintenance will vary on operating conditions. Where heavy dust conditions

exist, an accumulation of dust on the equipment may effect the operation of unit substation and its

protective apparatus.

When normal maintenance inspection and cleaning of bus connections, relays, lug connections, and other

part of the distribution system is being made, it is advisable to operate and check circuit breaker or

switch-disconnector operation. The following procedure is highly recommended.

Personal Caution is your best Safeguard

IMPORTANT

We draw your attention to the risk involved in using any cleaning process based on the

high pressure spraying solvent of an insulating solvent.

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Routine Field Testing

Routine field testing of the electrical equipment is intended to enable maintenance personal to determine,

without laboratory conditions or complicated equipment, that a particular electrical equipment is able to

perform its basic circuit functions.

The following constitutes a guide to tests that might be performed during routine maintenance.

1. Insulation Resistance Test

Extreme atmospheres and conditions may reduce the dielectric withstandability of any insulating

material. An instrument commonly known as "megger" is used to perform this test.

The voltage recommended for this test should be at least 50 percent greater than the circuit rating;

however, a minimum of 500 volts is permissible. Tests should be made between phases of

opposite polarity as well as from current carrying parts of the circuit protective device to ground.

Also, a test should be made between the line-and-load terminals with the circuit protective device

in the "OFF" position.

Resistance values below one megaohm are considered unsafe and should be investigated for

possible contamination on the surfaces.

NOTE: For individual circuit protective device's resistance readings, load and line conductors

should be disconnected. If not disconnected, the test measurements will also include the

characteristics of the attached circuits.

A temperature and humidity reading are recommended and recorded during the testing

period.

Insulation resistivity is markedly effected by temperature and humidity conditions. Based

condition of one (1) megaohm per kV assumes a 20°C wet bulb reading. The following table shall

be used to adjust readings to the 20°C constant.

TABLE OF TEMPERATURE CORRECTION FACTORS

Temp (°C) Motors Transformers

Oil filled

Cables

PVC 90 XLPE

0 0.40 0.25 0.22 0.41

5 0.50 0.36 0.37 0.54

10 0.63 0.50 0.58 0.72

15 0.81 0.74 1.00 0.96

20 1.00 1.00 1.53 1.28

25 1.25 1.4 2.48 1.70

30 1.58 1.98 4.03 2.26

35 2.00 2.80 6.53 3.01

40 2.50 3.93 10.70 3.99

45 3.15 5.60 17.10 5.30

50 3.98 7.83 27.85 7.04

55 5.00 11.20 45.00 9.35

60 6.30 15.85 73.00 12.40

2. Connection Test

Connections to the circuit protective device should be inspected to determine that a proper

electrical joint is present. If overheating in these connections is evident by discoloration or signs

of arcing, the connections should be removed and the connecting surfaces clean before re-

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connections. It is essential that electrical connections be made properly to prevent and reduce

overheating.

3. Mechanical Operation

During routine tests, mechanical operation of the circuit protective devices or disconnects should

be checked by turning it "ON" and "OFF" at least three times.

TRANSFORMER MAINTENANCE

Inspection during operation

1. Inspection of oil level: when adding oil safety distances have to be observed.

2. Inspection of oil leakage.

3. Inspection of transformer surroundings.

4. Inspection of surface treatment.

Maintenance during operation

For personal safety reasons only a limited amount of maintenance activities can be performed on

the transformer when it is in operation. These activities are, however, possible if safety

regulations are followed. In practice, however, always safest to remain below the level of the

cover of the transformer. Maintenance activity, which can be performed during operation is oil

sampling only.

Inspection and Measures to be taken during downtime

During downtime all inspection work and maintenance measures can be carried out, which can not

normally be performed during operation.

Before starting maintenance work, the transformer has to be disconnected from the network and earthed

or grounded. When the disconnector has been opened, one has to see to that they stay open and, before

grounding or earthing, one has to test that they are voltage free, i.e., with a voltage tester.

Inspection of oil leaks and precautions to be taken.

Oil leaks may occur as follows:

1) From bushing gaskets (if the gasket has become loose, tightening will help; if the gasket has lost

its elasticity, it has to be replaced. The reason for losing the elasticity can be excessive heating

or ageing of the gasket).

2) From cover gaskets, valves, and gaskets of the off-load tap changer (tightening of the screws or

bolts will usually help).

3) From welded joints (leaking joints can be repaired by welding. A skilled welder is needed for

the job).

Cleaning to be carried out annually:

1) Bushings (cleaning agent e.g. white spirit)

2) Transformer cover and tank

3) Glasses of relay, thermometer, and oil level indicator

Surface treatment:

Surfaces that have not been inspected during operation, should be checked and the damage

coatings be repaired.

Inspection and maintenance for accessories, protective and regulating equipment:

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1) To prevent oxidation of contact surfaces of the off-load tap changer it has to be moved from

side to side a few times, at least once a year.

2) function of alarms and tripping contacts of thermometers.

Inspection Measurements

In addition to the above instructions the following inspection measurement may be carried out:

1. Insulation resistance of windings

HV Winding to Earth

LV Winding to Earth

HV Winding to LV Winding

Reading below 75 megaohms should be reported to the manufacturer.

2. Transformer ratio test

Approximately 220 volts or 400 volts should be supplied from an isolating transformer via a

regulating transformer to one winding of the High-Voltage side of the transformer to be tested. HV

and LV readings can be taken by means of a general-purpose meter. The measurements must be

carried between each phase. The transformation ratio calculated from the voltage reading must be

compared to the ratio of the rated voltages and to the values from the test report. Due to inaccuracy

of the general-purpose meter a difference of a few percentages may be possible. It is advisable to

use a transformation ratio bridge for the measurement.

3. No-load current

A small voltage fed between each phase and the star point (in a star connected transformer) via an

isolating and regulating transformers will result in the reading of a series connected ammeter being

only a ten of milliamperes.

With the same voltage reading the current taken by other phases can be measured. The excitation

currents of different phases should be approximately the same magnitude. In a damage phase the

current can rise to tens of amperes thus the regulating transformer has to be protected by a suitable

fuse.

4. DC resistance of windings

A satisfactory large DC source and an accurate resistance bridge meter are needed for the

resistance measurement. When disconnecting the measuring current instrument dangerous voltage

can be induced. Therefore a skilled person must perform the measurement.

Opening/Resealing Sealed type Transformers

Sealed type transformers must not be opened unnecessarily as this could cause the oil to come out or air

to go in depending on the temperature of the oil. This results in disturbances of the normal pressure

variations causing increased stress on the tank due to under-pressure or over-pressures.

When opening the transformer, for example to replace a bushing, opening and resealing must be

performed according to these instructions.

Opening

1) If the temperature of the transformer oil is higher than +20...25°C, approximately 5% of oil

must be drained through the drain valve to relieve the pressure.

2) If the temperature of the transformer oil is below +20 °C, no draining is needed as there is

under-pressure inside the tank.

3) Filling plug can then be opened. If necessary the oil level can be lowered by draining through the

drain valve before carrying out the planned maintenance. (If the transformer is provided with an oil

level indicator, it also acts as the filling plug).

Resealing

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