KAZAKHSTAN

Caspian Sea

Uzbekistan

Kyrgyzstan

TENGIZ FIELD (TENGIZ IS KAZAKH FOR “SEA”), IN WESTERN KAZAKHSTAN, IS LOCATED IN THE LOW-LYING WETLANDS

ALONG THE NORTHEAST SHORES OF THE CASPIAN SEA AND IS ONE OF THE BIGGEST OIL FIELDS IN THE WORLD. DIS-

COVERED IN 1979, TENGIZ CONTAINS 24 BILLION BARRELS OF HIGH QUALITY OIL AND SIX TO NINE BILLION BAR-

RELS (1 KM³ AND 1.4 KM³) OF RECOVERABLE OIL. IT IS DEEP, HAVING A TARGET DEPTH OF 4,500 M. IT ALSO CON-

TAINS SIGNIFICANT GAS RESERVES (18,000 BILLION M3). THE PROCESSING PLANT IS MADE UP OF BUILDING BLOCKS.

TENGIZ / KAZAKHSTAN ONSHORE /

END USER: TENGIZCHEVROIL / A CONSORTIUM OF: CHEVRON / EXXONMOBIL / KAZMUNAIGAZ / LUKARCO

FIELD SUBSTATION REPLACEMENT

The Field Substation Replacement

Project aims to upgrade and ration-

alize the existing Field Power Supply

System by replacing 6 existing field

substations with 3 new substations.

SOLUTIONS DELIVERED

Skema was awarded the contract for

the design, manufacturing, inspec-

tion and testing of HV switchboards

and Remote Terminal Units (RTUs):

> 3 35 kV, 1250 A, gas insulated

switchboards (26 columns)

> 3 6 kV, 1250 A, 20 kA, 1 sec., air in-

sulated switchgear units (74 Columns)

> 4 redundant RTUs (10 columns)

and Electrical Control Systems -

based on PLC

> Switchgear continuous thermal

monitoring solution

> Arc fault protection system

INTEGRATED PROTECTION AND

CONTROL SYSTEM

The Integrated Protection and Con-

trol System (IPCS) for the project

was designed to monitor and con-

trol HV and LV switchgear located in-

side the different packaged Substa-

tions (North, South and West). Each

packaged substation is equipped

with a redundant Interface Con-

trol Unit (ICU) controlling 33 kV and

6.6 kV Switchgear with protocol IEC-

61850, Low Voltage Switchgear and

other utilities (HVAC, UPS, F&G) via

Modbus and hardwired interfaces.

A SCADA system is installed in the

Field Control Room to control and

supervise the electrical network.

Every substation is also equipped

with 4 video cameras and a vocal

communication system. This allows

to control the unattended substa-

tions (both through cabled alarms

and alarms generated by the vid-

eo cameras registering unexpect-

ed movements), and to commu-

nicate with the operators, giving

them directions. Data are record-

ed and are available in real time

for an Asset Lifet ime Manage-

ment System (maintenance and

energy ef f ic iency management

of the plant and its components).

SWITCHGEAR CONTINUOUS

THERMAL MONITORING SOLUTION

Skema provided TCO with Ex-

ertherm™, a continuous thermal mon-

itoring solution which allows to moni-

tor, in real time, the thermal health and

status of key bus bar joints and criti-

cal cable connections. This is achieved

by installing small plastic, non-con-

tact, non-powered, lifetime calibrat-

ed infrared and cable sensors within

the main electrical panels supplied.

This solution provides numerous tan-

gible benefits over traditional period-

ic scans, including greatly increased

levels of safety and integrity protec-

tion and reliability assurance through-

out the lifecycle of the electrical pan-

els. The integrity protection was further

enhanced by utilising a Load-Map™

software module which enables TCO to

dynamically adjust the thermal alarm

levels applicable to the load on the cir-

cuit being monitored, which provided

TCO with a level of integrity protec-

tion even at lower utilized load levels.

ARC FAULT PROTECTION SYSTEM

The 6 kV switchgear supplied for the

project has been equipped with a REA

arc fault protection system, which can

operate as a stand-alone device or in

combination with other modules, like

the REF relays. The REA arc fault pro-

tection system function is based on de-

tecting the intense light of an electric

arc, alone or on a detection of light and

simultaneous phase or neutral over-

current. On detection of an arc fault,

the REA protection system delivers

trip commands in less than 2.5 ms to

all circuit breakers that feed the fault

zone. Furthermore, the system oper-

ation indicators help localizing faults

by selectively guiding the maintenance

staff to the fault zone, that was identi-

fied by the arc fault protection system.

The REA module supplied for the project

features: two high-speed, galvanically

isolated, insulated gate bipolar tran-

sistor (IGBT) outputs (HSO1 and HSO2)

for CB tripping purposes; it offers one

heavy-duty relay output (TRIP3) to be

used, for example, as a circuit-breaker

failure protection (CBFP) output for an

upstream circuit-breaker, or as an alarm

output; it features an adjustable three-

phase overcurrent or two-phase and

neutral overcurrent condition monitor-

ing function, which enhances the relia-

bility of the arc fault detection by elim-

inating unwanted CB tripping caused

by light not related to any arc fault,

e.g. flash light used in photography.

END USER: TENGIZCHEVROIL / A CONSORTIUM OF: CHEVRON / EXXONMOBIL / KAZMUNAIGAZ / LUKARCO

Skema supplied products and solutions to the Tengiz

field, and specifically for the Central Power Station, the

Central Distribution Substation, for KTL 1 and KTL

2 Load Relief Substations, Sulfur Forming, Train 2.3

Power Station Upgrade, Plant Nitrogen System, and the

Kulsary Rip Sea Rail Yard.

SOLUTIONS DELIVERED

MV 10/35 KV SWITCHGEAR (183 COLUMNS)

INTELLIGENT POWER MOTOR CONTROL CENTERS (190 COLUMNS, 782 DRAWERS)

4 REMOTE TERMINAL UNITS

DISTRIBUTION BOARDS (218 COLUMNS)

INTEGRATED PROTECTION AND CONTROL SYSTEM (IPCS)