تاسیسات و تجهیزات الکتریکی

مطالب مفید برای علاقمندان مهندسی برق، حفاظت، کنترل و ابزار دقیق

نمونه مشخصات یک تابلو فشار متوسط

Power circuit

-     Working voltage                                                                      6.6 kV ± 8%

-          Rated voltage:                                                                          7.2 kV

-          Rated insulating level:                                                              12 kV

-          60 sec. Test voltage at 50 Hz:                                                  31 kV

-          impulse test voltage 1.2/50 micro s:                                          81 kV

-          frequency:                                                                               50 Hz + 5%   - 2%

-          symmetrical short-time current:                                                 31.5 kArms for 1 s (at 6.6 kV)

-          maximum value of the instantaneous short circuit current:                  90 KA

-          rated main bus bar current in continuous duty:                                      630 A

-          current rating for branches bus bars in continuous duty:                     630 A

These values shall be in compliance with the maximum capacity of the switchgear of the panel in question.

Auxiliary circuits and services

-          auxiliary voltage for closing and warning circuits:       230VAC + 10% - 15%

-          auxiliary voltage for breaking circuits:                         230VAC + 10% - 30%

-          protecting relay supply circuits:                                               230VAC + 10% - 20%

-          internal lighting , sockets                                            

       and heating resistor circuits:                                        230 V AC 50 Hz

-          test voltage for auxiliary                                                          2000 V – 50Hz

-          For electronic/digital apparatus (i.e. Protection relays) the testing voltage will be according to the relevant standards

 

5- DESIGN AND CONSTRUCTION

 

-The boards shall be of air insulated, metal-clad and shall be of prefabricated self supporting type for indoor installation in industrial plants and shall be designed for mounting on structural steel base embedded in concrete construction. The boards shall consist of independent, standardized easily assemble cubicles provided with front door.

-Moreover it shall be such as to allow the addition of other cubicles without major mechanical modification to the existing cubicles.

 -The switchgear shall have circuit breakers and earthing switches and also vacuum contactor for 6.6KV transformers. The circuit breaker shall be of the horizontal draw-out indoor type and units with equal rated currents shall be readily interchangeable with another. Circuit breakers shall be of vacuum and draw-out type.

- The switchgear shall be of flush fronted design having a neat and clean appearance and readily extensible. The front doors shall be swinging type and provided with locking device.

- All components shall be accessibly mounted in the switchgear and shall not impede access to wiring or terminals.

-On the back side , the cubicle shall be closed with removable steel sheet to ensure accessibility for inspection or maintenance.

-Moreover, every casual contact between HV gears and LV gears shall be absolutely prevented by suitable means such as screening.

No readily inflammable material shall be used in the construction of the frame supports or enclosure.

-The boards shall have the following protection degree:

IP 42 with closed door

IP 20 with open door

 

-Each cubicle shall have sufficient strength to withstand all accidental damages due to transportation, storage, erection, operating conditions, short circuit etc. Without suffering deformation or other damages of any kind. The cubicles shall be provided with lifting lug.

-The front doors shall have mimic diagram.

-Unless otherwise specified, the cable inlets and outlets shall be from the bottom (6.6kv ,control, auxiliary cables) . The auxiliary connection between the panels shall be located on the top of the board. All necessary cable glands, lug & terminals shall be provided.

-Each board section shall consist of one bus system and shall withstand the same value and duration of short-time withstand current as specified for the bus-bar in this section.

-The switchgear shall be constructed from sheet steel of the thickness not less than 2.5mm and the finish shall consist of two coats of anticorrosion prime and two coats of final.

-All cubicles shall be fitted with metal rustproof nameplate in English to be fixed by screws.

Moreover, for each cubicle a circuit identification label shall be provided rating plate, marking and labeling for all components of the switchgear shall be according to IEC.

-All metal parts for the switchgear not belonging to the current carrying components and equipment but which might come in contact with energized part due to failure or to striking of an electric arc will be interconnected by means of an earthed conductor.

-Access to energized part when the equipment is will not be possible unless suitable equipment is used.

-Removal of draw-out equipment will be possible only through a sequence of specific mechanically inter-locked operations, by which the equipment is de-energized.

- Equipment under possible electro static induction (such as capacitors etc.) shall be duly earthed before access is provided.

- The draw-out unit normally earthed shall remain so during the draw- out operations until the distance from the live components is less than the isolation distance.

- All necessary and special tools, hardware, etc, required for the satisfactory installation, commissioning , shall be provided.

- All faults occurring with any individual unit shall be contained with the unit , an except for bus-bars fault shall not cause shut-down of any section board other than the unit itself .

- All equipments shall be constructed of non-hygroscope and non-flammable material.

-The supply shall include all the material necessary for anchoring at the floor (i.e. base frame etc.)

-Each C.B. and M.V. cable compartment shall be fitted with proper heating resistors M.C.B. controlled by adjustable thermostat (for each panel: No. 2 heating resistors and No. 1 thermostat).

-Special precautions shall be taken to prevent corrosion between different metals

-Internal lighting in aux cell shall be considered. The lamp shall be controlled by end-switch.

-One 230 V a.c. socket in each aux. Cell must be provided.

-the metal clad switchboard shall be designed for mounting on a structural steel base embedded in concrete

-Each compartment shall be provided with a door. Each door shall be provided with a dedicated lock (n. 2 keys)

 

6- WIRING

-The sequence of phases shall be R-S-T from left to right when operator see the panel from the front.

 The auxiliary wiring shall have the following cross section:

Ammeter circuit:                                                                                                                                              ≥ 4 sqmm

Internal board feeders (between panels):         ≥ 4 sqmm 

Other circuits:                                                  ≥ 2.5 sqmm

 

Terminal strip

Requirements on terminal strips:

 For the ammeter circuit shall be short circuit able type;

 For the voltmeter circuit shall be sectionalizing type;

At least the 10% spare terminals for each type shall be provided.

 

 Each section of the D.C and A.C distribution system shall be provided with an individual supply which shall be protected by a 2 pole automatic circuit breaker provided with thermo magnetic trips. Circuit breakers or fuse of auxiliary circuit terminals and other auxiliary apparatus requiring attention while the equipment is in service shall be accessible without exposing high- voltage.

 

7- BUS-BAR AND CONNECTIONS

Bus-bars and connection between the several pieces of apparatus forming the equipment of a cubicle shall be of high conductivity 99.9% electrolytic copper.

Buses in the cubicles shall be sized to carry their maximum load continuously without exceeding the allowed temperature limits stated in IEC recommendations at voltage 5% lower than the rated value. The bus-bar system shall be according to electrical characteristics which mentioned in this specification. The buses shall withstand the electrodynamics stresses caused by short-circuits without undergoing permanent deformation.

Main and branching-off buses shall be covered with an insulation material of non-hygroscopic type.

The bus shall be segregated and arranged in a separate special metal duct into the back compartments.

- Bus Supporting shall be insulating diaphragm type and shall be made of non-hygroscopic insulating materials. Bus supporting installed between the compartments shall also of non-flame propagating type.

- Bus - bars connections and their supports shall be of an approved type designed to withstand all normal and abnormal conditions arising in the system. They shall be capable of carrying the short circuit rating, for period of not less than 1 s.

- The bus-bars connections in individual units shall have a continuous current rating of not less than that of the equipment the unit.

- All the points where connections or joint occur the bus-bars and connecting pieces shall be silver plated, clamps where used, shall be phosphor bronze and bolts for joints shall be of stainless steel.

- Main bus-bars shall have rounded edges to protect against "point effect"

 

8- CIRCUIT - BREAKERS

- The circuit breakers shall be of horizontal withdraw able type for indoor installation. They shall be housed into the front compartments.

- All circuit breakers of equal rated current shall be interchangeable.

- Circuit breakers shall be able to remain in three different positions within the cubicles.

- "Inserted"

Normal operating, position. In which main and auxiliary circuit are connected.

 

- "Test"

Main circuits isolated and auxiliary circuits are connected.

-"Isolated"

Both main and auxiliary circuits isolated

- It shall be possible to close the front door of the cubicles whatever the position of the circuit breaker is.

- In the connected and isolated positions, the circuit breakers remain inside the compartment with door closed.

- A series of mechanical interlocks are provided to prevent wrong operation.

- Movement of the withdraw able module from isolated to service position is possible only with the earthing switch in open position.

- The earthing switch can be closed only the withdraw able module is in isolated position.

- The circuit breaker cannot be inserted or drawn-out in closed position.

- The circuit breaker cannot be closed with the withdraw able module being in between isolated and service positions.

- Automatic shutters are closed when the circuit breaker is moved from the service position; totally avoid any accidental contact with the live parts.

- Movement of the withdraw able module from isolated to service position or vice versa cannot be done with the front door open.

- It is possible to lock circuit-breaker truck in service and isolated positions.

- The circuit breaker actuating mechanism shall be of spring loaded type, and the spring loading motor shall be of D.C type.

- Circuit breakers shall be provided with independent opening and closing circuits, individually protected by two-pole circuit breakers equipped with thermo magnetic trips.

- The closing circuit shall also supply the spring loading motor, a lamp shall permit remote supervision of the spring loading.

- Positively driven mechanically operated indicating device shall be provided to indicate whether a circuit breaker is in the open or closed, service, isolated or earthed position.

A visual mechanical indicating device shall also be fitted to show the state of the mechanism closing spring.

- Alarm circuits shall always be electrically independent of control and indicating circuits. A lamp shall be provided to permit supervision of the circuit breaker opening circuit.

- 23OVAC power shall be provided from external source and double pole MCCB shall protect the circuit where entering the switchgear. A loss of power 230 VAC relay shall be used at load side of MCCB, with adequate number of contacts for alarm and tripping purpose in the switchgear and for remote. Minimum two N.C voltage free contacts shall be provided for remote alarming of loss of A. C supply.

- Each cubicle shall be equipped with a thermostatically. Controlled space heater minimum for separate 230V AC. External power lines shall feed the 230V AC circuits of switchgear, two for cubicles space heaters and two for others. One line of each of them shall feed the odd and the other line shall feed the even cubicles the space heater circuit in each cubicle shall be protected by single pole MCB.

- The circuit breaker shall be provided with a, hand-operated emergency control which shall allow opening and closing operations also in the case of loss of control supply. Breaking and making capacities shall be ensured also by hand operation.

- Moreover, the circuit breaker shall be provided with safe mechanical interlocks to avoid faulty connecting operations when the breakers are in the open position. Closing electrical control shall be provided with an antidumping device and a short pulse actuation.

- The normally closed and normally open auxiliary contacts used for external connections shall be electrically independent.

- The rated operating sequence shall be 0-0.35 Co-3min - Co.

- The rated voltage (Y) of spring- loading motor and related upper and lower limits : 230V+10%-15% AC .

- Rated voltage (V) of closing coil, opening coil and related upper and lower limits.

Closing coils                   230V+10%-15% AC

Tripping coil                   230V+10%-30% AC

9- CURRENT TRANSFORMER

All current transformers shall have the following characteristics

-          Type:                                                               solid resins insulation

-          Insulation reference voltage                             12 kV

-          1 min test voltage                                             31 kV at 50 Hz (rms)

-          impulse test voltage 1.2/50 micro s                  81 kV pk

-          maximum permanent thermal current              1.2 times the primary rated current

-          rated short-circuit current                                  31.5 kA – 1 s

-          No. of cores as indicated in the enclosed drawings

-          Rated secondary current 5 A (unless otherwise specified in the enclosed drawings)

-          Where specified on the diagrams 5/1 correctors shall be provided

-          Rated output (VA) must be suitable for connected instruments and relays

-          The measuring core shall have a 0.5 % class of accuracy

-          Accuracy class of protection core                    5P

-          Accuracy limit factor:

-          For protection                                                  10

-          Rated primary current values                             as single line diagram

-          Secondary windings shall be earthed

 

10- POTENTIAL TRANSFORMR

All potential transformers shall have the following characteristics:

-          Type                                                                Insulation in solid resins

-          Insulation reference voltage                             12 kV

-          1 min test voltage                                             31 kV at 50 Hz (rms)

-          Impulse test voltage 1.2/50 micros                   81 kV pk

-          Primary connection normally between phase and earth

-          Primary voltage                                                            6.6/ sq.3 kV

-          Secondary voltage                                           100/ sq.3 V

-          Rated voltage factor                                         1.2 for unlimited time

-          Accuracy class                                                 0.5%

-          Rated output (VA) must be suitable for connected instruments and relays .

-          All potential transformers shall be mounted in a normal PT compartment and mounted in a draw-out type carriage, protected by:

-           M.V. side:       fuses

-           L.V. side:        M.C.B. complete with signal contact.

-          The cubicles housing potential transformers shall be completely diaphragmed with respect to all other switchboard components.

-          Sectionalizing shall be controlled from outside with the cell door closed.

-          Suitable metal shutter must segregate the PT’s and fuses zone such as one open the door only with sectioned PT’s and fuses.

 

11- RELAYS & INSTRUMENTS

- Control and protection relays shall be of withdraw able, flush type , with dust and moisture - proof suitable for tropical climatic, and shall be provided with at test device, they shall also be provided with minimum two contacts, the first one for tripping, and the second for the alarm .

- All protection relay must be fully digital and programmable and must have suitable port for programming via a PC.

- They shall be suitable for the purpose they are used for (protecting main feeder, transformer, motor, etc) and shall perfectly function considering the purpose according to the single line diagrams, accuracy and selectivity.

- Contactor panel for motor conveyor feeding must have multi function motor protection relay

- The relays shall be installed on the cubicle front side.

- The relays characteristics shall be as follow or better.

-Coil voltage                                                                  230VAC+10%-20%

-Signal voltage on contact circuit                                 230VAC

-Rated contact current                                                    10A making

-Rated thermal current                                                              16A

-Contact bounce                                                           Less than 8ms

-Contact life                                                                  100,000 operation

Transient protection                                                       IEC 255-4 class 3

- The contact of relays in circuit of closing coil & Tripping coil shall be capable of breaking tile maximum current which may occur in the circuit which they have to control.

- The over current relays shall have rated current of 5A, with loading capacity of 5 times the rated current for continuous overload, and, 100 times the rated current for 1 second, transient overload.

- The contacts of all relays shall be capable of, making and breaking the maximum current which may occur in the circuit which they have to control.

- Relays shall not be affected by mechanical shock or vibration, or by external magnetic fields consistent with the place or method of mounting.

- Each indicator where of electrically or mechanically operated type, shall be reset able by hand without opening the relay case.

- All relays shall be suitably marked to clarify their function, phase color of the current and/or voltage supply, characteristics curve (where appropriate) , rated current and/or voltage of relay coils, etc.

- Means shall be provided to enable relays and associated current transformers to be tested without having to remove wires.

Types and specification of the relay recommended for different circuits shall be approved by the client.

Test blocks for protective relaying circuits. (Voltage transformer and current transformer lead)

The test blocks shall be installed on the cubicle front side.

11-1- WATT. VAR & POWER FACTOR TRANSDUCER SPECIFICATION:

-           Input current (Nominal):                     0-5A

-           Input voltage (phase to phase):                       0-100V

-           Frequency:                                          45-55Hz

-           Power supply:                                                 230VAC±20%(ACC to IEC 688-1)

-           Test voltage:                                       2KV 50Hz. 1min

-           Impulse test:                                       5kv 1.2/50ms (Acc. IEC. 521)

-           Output:                                                 4-20mA

-           Overload continuous:                                     1.2 nominal input

-           Overload continuous:                                     10xNominal input &

1xNominal input voltage (for 3sec)

-           Current circuit burden:                                    <1 VA

-          Voltage circuit burden:                                    <2V A

-           Accuracy class:                                     0.5

-           Linearity error:                                    ±0.2%

-           Temperature range:                             -25 to 55°C

-           Ripple:                                                1% P.P (peak to peak)

-           Time constant:                                                <500ms

 

11-2- ENERGY TRANSDUCER SPECIFICATION

-           Input range:                                         4-20mA

-           Power supply:                                                 230VAC ±20%

-           Output:                                               1 imp = 1 kwh

1 imp = KVArh

-           Accuracy class:                                    0.5

-           Test voltage:                                       2KV-50Hz – 1min

-           Impulse test:                                       5 kv 1.2/50ms

-           Temperature range:                             -25 to 55°C

-          The transducers shall have galvanic separation between in and output. The outputs shall be wired to the terminal strip.

 

12- SIGNALS & SWITCHES

Each cubicle shall have following signal & switches:

 

A – transformer and feeder outgoing cubicles :

Signal lamp for indication of:

-circuit breaker test position

-circuit breaker service position

-circuit breaker open

-circuit breaker close

-circuit breaker tripped

-earthing switch close

- permission to close

 

for transformer and feeder outgoing Alarm unit(annunciator) for indication of:

-bochholz relay alarm (only for transformer outgoings)

-bochholz relay trip (only for transformer outgoings)

-transformer temperature alarm (only for transformer outgoings)

 -transformer temperature trip (only for transformer outgoings)

-transformer oil level trip (only for transformer outgoings)

-transformer oil pressure alarm (only for transformer outgoings)

-230 VAC failures

-protection relay trip

 

Transformer outgoing cubicles shall have following switches:

-open push botton

-close push botton

- reset push botton

-lamp test push botton

-Local-o-remote selector switch

-ampere meter selector switch

 

B – Incoming cubicles:

Signal lamp for indication of:

-circuit breaker test position

-circuit breaker service position

-circuit breaker open

-circuit breaker close

-circuit breaker tripped

-earthing switch close

- Permission to close

 

Incoming feeder must have Alarm unit (annunciator) for indication of:

-upstream circuit breaker failure

-230 VAC failures

-protection relay trip

-under/over voltage trip

 

Incoming cubicles shall have following switches:

-open push botton

-close push botton

- reset push botton

- Earthing switch close ( with ready to close signal) – illumination pushbutton

-lamp test push botton

-Local-o-remote selector switch

-voltmeter selector switch

General notes

-capacitive dividers with indicators of presence of the voltage in the cable must be considered according to single line diagram

Spare windows in alarm units must be considered

- With the circuit breaker in the "inserted" position remote control conditioned by local permissive device.

- Exclusion of both local and remote control if the control switch is in, the locked out position.

- Indicating lamps and lamp holders shall be arranged so that replacement of lamps and cleaning of reflectors and glasses can be readily effected.

- The control of all breakers shall be possible from two position. (Local, supervisory) and they shall be wired to the terminal strip.

Following signals must be provided in each cubicle (for connecting to supervisory system)

- AC failure

- Protection trip

- Protection relay healthy

-Circuit breaker on

- Circuit breaker off

-earthing switch on

- insert position

- test position

- Permission to remote closing

- Panel ready

Note: Before construction manufacturer should issue complete switchgear drawing included the single line diagram and power & control circuit diagram & switchgear layout according to this specification and Esfahan Steel Company standards. After client approval manufacture can start fabrication stage.

13- EARTHING

- In general the continuity of the earthing circuits shall be ensured taking into account the thermal and electrical stresses caused by the current they may have to carry.

- All metal pans other than those forming part of an electrical circuits shall be connect to a hard drawn high conductivity copper earth bus- bar which shall run the full length , and be bolted to the main frame of the switchgear the grounding bus shall have a minimum cross  section of 250 sq.mm.

- At each end of the grounding bus, terminals shall be fitted for connection to the plant earthing system.

- All the frameworks, doors, devices, non active metal parts, CT and VT secondary neutral points and HV cable shielding shall be connected to the aforesaid grounding bus by adequate means.

- The design and construction of all withdraw able equipment shall be such that all metal parts, other than current carrying parts are earthed before the primary connections are made, and shall remain earth connected until the conditions for the isolating distance according to IEC recommendations are met.

- Earthing switch shall be provided in the following cases:

 1. at the line side of incoming lines

 2. at the load side of outgoing feeders

- For the above cases, the earthing switches shall have the following interlocks:

- Electrical and mechanical interlocking between the incoming lines earthing switches and related upstream switchgears C.B

 Mechanical interlocking may be key-locking or other approved locking.

- Electrical and mechanical interlocking with the relevant circuit breaker which are in the same cubicle.

- The earthing switch shall have aux. Contact. (Not micro switch)

14- WIRING METHOD

- A distinct and separate wire number shall be assigned to all control wires on the elementary diagram.

-The wire number shall appear on all wiring diagrams and wife tables.

 - All terminations shall be marked with the wire number by wrapping the wire, with adequate means.

- All terminals and terminal blocks shall be marked with the wire number.

- All wiring for devices remote from a piece of equipment shall be brought to terminal blocks.

- Terminal blocks for wires which do not leave tile equipment shall be avoided.

- All terminals at LV compartment for CTs shall be current test terminal.

15-AUXILIARY TOOLS

All necessary tools for the installation and maintenance of each switchboard shall be supply.

In addition, the following items shall be supplied:

 

  • No. 1 set of hand operated levers for drawing out and fitting in of the switchgear
  • No. 2 sets of keys for all kinds of door locks;
  • No. 4 eyebolts for lifting of each panel
  • No. 1 can of paint for each type of repair work and touch – up.
  • No. 1 C.B. truck for circuit breakers and contactor movement
  • No. 2 L type brackets with bolts for lifting a switchboard section
 
 
 
 
 

 

16- INSPECTION AND TESTING

Supplier is required to submit the QCTM (Quality Control and Test Manual) with the ITS (Inspection and Test Schedule) for the purchaser approval. The QCTM is composed by the QCP (Quality Control Plan), the applicable reference drawing and the inspection and testing procedure.

The ITS is the general planning of the quality control activities.

Routine test shall be performed according to IEC standards. During the construction program and the factory acceptance test, the purchaser must be allowed to visit with its own personnel as well as the final client, the manufacture works in order to check the development of the construction works and to verify its conformity to the technical specification and to check the guarantee values are fulfilled. To assure the quality of the equipment, reviews and acceptance tests are important. The quality assurance is basically divided into three parts:

1) DESIGN REVIEW: When the supplier is ready with detail design specification for a project, these are reviewed. The supplier is responsible for arranging the Design review meetings. The programming of a system or construction may not start until the design specifications are approved by the purchaser. The design review is performed by the supplier and under the purchaser supervision. A design review report must be written by the purchaser.

 

2)FACTORY ACCEPTANCE TEST (FAT): Before the delivery of the equipment and systems, those have to be tested according to the approved QCTM and all applicable standard and specifically following the “ routine test “ procedure, at the supplier’s facilities by the supplier and under the supervision of purchaser’s personnel. During the testing, various functional and operational items will be checked   according to the functional specification approved in QCTM.

The supplier is responsible for arranging the FAT. A checklist is written for the remaining items.

These have to be corrected before shipping, if possible and latest before site commission of the equipment and system starting. The checklist is included to the FAT report, written by the purchaser. After the tests are carried-out the “routine test” certificates shall be submitted to the purchaser personnel.

3) SITE ACCEPTANCE TEST(SAT): This test shall be performed on the site when the plant is operational according to the approved procedure.

The SAT is performed together with the hot test. It is performed by the supplier, under purchaser’s supervision. The supplier is responsible for arranging the SAT , upon the purchaser’s request.

A checklist is written for the remaining items. When no items remain, the system is considered as delivered. The checklist is included to the SAT report, written by the purchaser.

 

 

17- PAINTING AND RUST PREVENTION

The type of painting and procedure of painting shall be submitted for approval.

The final color code shall be according to the following.

Power switchboard

Externally and internally                            RAL                             7032

18- PACKING AND DELIVERY

All equipment shall be delivered at site. Esfahan Steel Company

- Supplier shall furnish the purchaser with "packing & delivery" time-

table which includes duration of activities involved in packing & delivery.

- Supplier shall submit "procedure and specification of packing.

- A copy of packing list and supply list will accompany each package.

 - A copy of instruction manual

 

19- DOCUMENTATION

- Supplier's proposal shall include, as minimum, the following documents; (in English language).

- A list of recommended spare parts for commissioning shall be included in supplier's quotation,

- A summary of test/inspection items, procedures and judgment criteria,

- Technical data and illustrated descriptions of all items to permit a full technical appraisal to be made.

- Layout of general arrangement of the complete package which should also show the outline of electrical room.

- Single line diagrams of switchgear.

 - Front view of the panels with dimensions.

- Suppliers shall provide and submit the spare part list for two years with technical specification of each equipment, type, manufacturer, serial and positions in the relevant dwgs of switchgear.

- Supplier shall submit the instruction manual for packing, transportation, unpacking, installation, termination, testing, commissioning, operation and periodic maintenance schedule.

- Accessory list with data sheet

- Arrangement dwgs

 - Assembly dwgs

- Sectional assembly dwgs

- Painting and rust prevention procedure specification

- Functional test procedure

- Civil information and drawings for foundation design

- Confirmation of the single line diagrams

- Drawings which show the location and indicating the requirements for all termination points and interface outside this contract

- Finalized circuit diagrams for power and control.

- Relay setting tables complete with calculations

- Panel drawings showing front and rear layout, cross sections, panel wiring and tubing

- Detailed wiring diagrams, part list

- Reports on test perfumed

- Results of non-destructive tests , together with the pertinent sketch and description relevant

- Original technical catalogues and specification of equipments should be submitted

- At least one month before starting the tests of switchgear the Q.C.T.M shall be submitted for approval.

- Each of the above documents should be prepared in 6 copies and dispatched through courier to purchaser.

- All dwgs should be prepared submitted in CD rom, auto cad/windows software.

 

20- GUARANTEE

Satisfactory and trouble – free operation of the equipment under specified conditions shall be guaranteed for a period of 18 month from starting operation or two years from delivery of equipments, whichever comes earlier. Guarantee bonds and other conditions will be set separately. Supplier shall undertake supply of the equipment package spare parts for a period of fifteen years.

  
نویسنده : مهندس شهامتی ; ساعت ٦:٤٥ ‎ق.ظ روز چهارشنبه ۳۱ اردیبهشت ۱۳٩۳