• จัดหา Surge Arrester ที่มีคุณภาพและประสิทธิภาพสูง เพื่อป้องกันอุปกรณ์ไฟฟ้าจากการเกิดแรงดันเกิน
• ลดความเสียหายของอุปกรณ์ไฟฟ้าอันเนื่องมาจากฟ้าผ่าหรือเหตุการณ์อื่นๆ ในระบบไฟฟ้า
• เพิ่มความเชื่อถือได้ของระบบไฟฟ้าของการไฟฟ้านครหลวง

• ผลิตและจัดหา Surge Arrester ขนาด 9 kV และ 21 kV ตามข้อกำหนดทางเทคนิค
• ทำการทดสอบ Type test และ Routine test ตามมาตรฐานที่เกี่ยวข้อง
• จัดทำเอกสารทางเทคนิคที่เกี่ยวข้อง เช่น แบบ drawing, คู่มือการติดตั้ง และผลการทดสอบ
• บรรจุหีบห่อ Surge Arrester ให้มีความแข็งแรงและป้องกันความเสียหายระหว่างการขนส่ง
• จัดส่ง Surge Arrester ไปยังคลังสินค้าของการไฟฟ้านครหลวง
• ให้การรับประกันสินค้าตามเงื่อนไขที่กำหนด

• Surge Arrester ขนาด 9 kV และ 21 kV ที่มีคุณสมบัติตามข้อกำหนด
• รายงานผลการทดสอบ Type test และ Routine test
• แบบ drawing และคู่มือการติดตั้ง
• การรับประกันสินค้า

• ไม่ได้ระบุระยะเวลาโครงการไว้ใน TOR

• Eligibility Requirements: ไม่ได้ระบุ
• Standards Compliance:
  • ต้องเป็นไปตามมาตรฐาน IEC 60099-4(2006) หรือ มอก. 2366-2551 หรือมาตรฐานอื่นที่เทียบเท่า
• Experience: ไม่ได้ระบุ
• Previous Project Cost: ไม่ได้ระบุ
• Technical Capabilities:
  • ต้องมีผลการทดสอบ Type test ตามมาตรฐาน IEC 60099-4 หรือ มอก. 2366-2551
  • ต้องมีผลการทดสอบเพิ่มเติม เช่น Moisture ingress test, Weathering ageing test, และ Short circuit test
• Personnel: ไม่ได้ระบุ

• ไม่ได้ระบุเกณฑ์การประเมินราคาอย่างละเอียดใน TOR

• Surge Arrester ต้องเป็นแบบ gapless metal-oxide type, single column และมี polymeric housing เท่านั้น
• Creepage distance ของ Surge Arrester housing ต้องไม่น้อยกว่า 25 มม./kV ของแรงดัน nominal system voltage (เช่น 300 มม. สำหรับ 9 kV Surge Arrester)
• ต้องมี mounting bracket ตามแบบ Dwg.no.180903
• ต้องมี protective cap ที่ทำจาก silicone rubber ครอบ terminal ด้านแรงสูง

• ไม่ได้ระบุรายละเอียดเกี่ยวกับเงื่อนไขสัญญา เช่น กำหนดการชำระเงิน ค่าปรับ ไว้ใน TOR

• Q: Surge Arrester ที่เสนอต้องมีคุณสมบัติเป็นไปตามมาตรฐานใด?

  • A: Surge Arrester ที่เสนอต้องเป็นไปตามมาตรฐาน IEC 60099-4(2006) หรือ มอก. 2366-2551 หรือมาตรฐานอื่นที่เทียบเท่า

• Q: ต้องทำการทดสอบอะไรบ้างสำหรับ Surge Arrester ที่เสนอ?

  • A: ต้องทำการทดสอบ Type test ตามมาตรฐาน IEC 60099-4 หรือ มอก. 2366-2551 และการทดสอบเพิ่มเติม เช่น Moisture ingress test, Weathering ageing test, และ Short circuit test

• Q: Creepage distance ของ Surge Arrester housing ต้องมีค่าเท่าใด?

  • A: Creepage distance ของ Surge Arrester housing ต้องไม่น้อยกว่า 25 มม./kV ของแรงดัน nominal system voltage

• Q: ต้องมี mounting bracket มาพร้อมกับ Surge Arrester หรือไม่?

  • A: ต้องมี mounting bracket มาพร้อมกับ Surge Arrester ตามแบบ Dwg.no.180903

• Q: Protective cap ที่ครอบ terminal ด้านแรงสูงต้องทำจากวัสดุอะไร?

  • A: Protective cap ที่ครอบ terminal ด้านแรงสูงต้องทำจาก silicone rubber

• Q: เอกสารทางเทคนิคที่ต้องจัดส่งมีอะไรบ้าง?

  • A: ต้องจัดส่งแบบ drawing, คู่มือการติดตั้ง และผลการทดสอบ

• Q: Surge Arrester ที่เสนอต้องเป็นแบบใด?

  • A: Surge Arrester ที่เสนอต้องเป็นแบบ gapless metal-oxide type, single column และมี polymeric housing เท่านั้น

• Q: การรับประกันสินค้ามีเงื่อนไขอย่างไร?

  • A: ไม่ได้ระบุรายละเอียดเกี่ยวกับการรับประกันสินค้าไว้ใน TOR

• Q: สามารถเสนอ Surge Arrester ที่เป็นไปตามมาตรฐานอื่นนอกเหนือจาก IEC 60099-4 หรือ มอก. 2366-2551 ได้หรือไม่?

  • A: สามารถเสนอ Surge Arrester ที่เป็นไปตามมาตรฐานอื่นได้ แต่ต้องแนบสำเนามาตรฐานฉบับภาษาอังกฤษมาพร้อมกับข้อเสนอ

• Q: หากผลการทดสอบ Acceptance test ไม่เป็นไปตามเกณฑ์ที่กำหนด จะมีผลอย่างไร?

  • A: หากผลการทดสอบ Acceptance test ไม่เป็นไปตามเกณฑ์ที่กำหนด กฟน. จะปฏิเสธสินค้าทั้งหมดใน lot นั้น และผู้ขายจะต้องส่งสินค้าใหม่พร้อมรายงานการปรับปรุงแก้ไข

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• 7
  SPECIFICATION NO. 752
  3
  SPEC. NO.752: 03-2019 PAGE 1
  9 kV and 21 kV SURGE ARRESTER FOR ALTERNATING CURRENT SYSTEM (FOR 12 kV and 24 kV SYSTEM)
  752A Scope
  This specification describes the requirement with which the manufacturer shall comply in order to supply 9 kV and 21 kV surge arrester for alternating current system (for 12 kV and 24 kV system) to the Metropolitan Electricity Authority (MEA), Thailand. 752B Site and Service Condition
  The surge arresters shall be installed in the Bangkok Metropolis, Thailand. The service conditions are as follows: -
  a) Altitude : approximately mean sea level.
  b) Maximum temperature : 40 ºC.
  c) Average temperature in any one year : 30 ºC.
  d) Average relative humidity in any one year : 79%.
  e) Average maximum relative humidity in any one year : 94%.
  f) Isokeraunic level : 100 days/year.
  The surge arrester shall be suitable for use in tropical climatic area and shall be capable of operating successfully in the service conditions mentioned above.
  752C Reference Standards
  Except otherwise specified elsewhere in the specification, surge arrester shall be manufactured and tested in conformity with the standards listed below.
  Thai Industrial Standard Institute (TISI):-
  No. 2366-2551 : Surge arresters-Part 4: Metal-oxide surge arresters without gaps for a.c. systems.
  International Electrotechnical Commission (IEC) Publication:-
  IEC 60099-4(2006) : Surge arresters-Part 4: Metal-oxide surge arresters without gaps for ac systems.
  Note

1. The surge arresters tested in accordance with the later version of the above standard is also accepted.
2. The surge arresters tested in accordance with older version or draft version of the above standard are also accepted provided that the test report is conformed to standard and year mentioned above.
3. For TIS standard no. 2366-2551 shall be appliedfor Thai manufacturer. If there are any minor parts deviated from the standards, they shall be clearly mentioned in the “DEVIATION FROM MEA’S SPECIFICATION FORM” attached herewith.
   (03/19)
   4
   SPEC. NO.752: 03-2019
   PAGE 2
   The surge arresters comply with other national standards having similar characteristics and providing equal performance and/or quality to those specified may be proposed. In this case, the complete ENGLISH language copies of the standards shall be submitted with the quotation; otherwise such offer may not be considered.
   752D Test, Inspection and Test Report
   752D1 The proposed surge arresters shall have successfully passed all the type tests or design tests in accordance with the reference standards.
   Surge arrester shall also pass additional test as follows:-
   a) Moisture ingress test.
   b) Weathering ageing test according to IEC 60099-4 or tracking and erosion test according to IEC 61109 or equivalent test. The duration of test shall be
   1,000 hours for 5 kA surge arrester and 5,000 hours for 10 kA surge arrester. c) Short circuit test according to IEC 60099-4 to verify non fragment of surge arrester housing during internal arc fault. The test current shall be not less than system short circuit current as specified in clause 752F and duration not less than 0.2 second.
   The test report of additional test is also required and shall be submitted. Type test of disconnector for 5 kA arresters shall be made on arresters which are fitted with arrester disconnector or on the disconnector assembly alone if its design is such as to be unaffected by the heating of adjacent parts of the surge arrester in its normally installed position.
   In case the disconnector is not tested with proposed surge arrester, it shall be accepted on the following conditions:-
   a. Long-duration current impulse test
   The test is made with higher classification of surge arrester.
   b. Operating duty test
   The test is made with the sample disconnector in series with a test sample section of the surge arrester having the higher reference current.
   c. Disconnector operation
   c.1 For the disconnector which is unaffected by the operation of the
   arrester, the test can be made on any arrester or on disconnector
   assembly alone.
   c.2 For the disconnector which is affected by internal heating of the
   arrester, the test shall be done with arrester having the nonlinear
   resistors bypassed with a bare copper wire 0.08 mm to 0.13 mm in
   diameter.
   Except otherwise specified elsewhere in the specification, all test reports shall be attached to the bid, otherwise MEA will not consider such offer.
   (03/19)
   5
   SPEC. NO.752: 03-2019
   PAGE 3
   752D2 Standard factory tests shall be madeas routine test, each rating of the surge arrester shall be tested consisting of at least the following items: -
   Test Items
   Unit Tested
   Unit required for
   inspection(if any)
   Residual voltage test at nominal discharge current
   All Units
   Nearest lower whole number to the cube root of the purchase quantity
   Measurement of reference voltage at reference
   current
   Partial discharge test
   Leakage check (for arrester units with sealed housing)

752D3 MEA reserves the right to send the representative at his expense to inspect the material and to witness the tests at the manufacturer’s works. The
manufacturer shall afford the MEA’s representative all reasonable facilities to satisfy him that the materials, equipment and all tests are in accordance with the specification.
752D4 Prior to the shipment, the supplier shall submit to MEA the complete and certified reports of all tests made in 6 (six) copies. The test reports shall contain all data required for their complete understanding such as; diagrams, methods, instruments, constants and values used in the tests and the results obtained. If MEA has his own inspector, the supplier shall submit all the above test reports to the inspector and the inspector himself shall certify the witnessed test report and review the remainder before submitting to MEA.
752D5 After the surge arresters arrive at MEA’s warehouse in each lot, MEA will sample 5 (five) sets for acceptance test according to table 1.
If at least 1 (one) sample fails the testing criteria as specified, MEA shall reject all items in the lot. The supplier shall resend the new products with the report showing the improvement process and cause analysis or the revised products with the report showing details of revision and cause analysis. The supplier shall also be responsible for all expenses of the new acceptance test.
(03/19)
6
SPEC. NO.752: 03-2019
PAGE 4
Table 1
Test Item
units of tested samples/lot
Condition
Surge arrester

• Measurement of reference voltage
  (at reference current not
  exceed 1 mA)
  5
  The reference voltage shall not be less than the followings:-
  ≥ 9.7 kV /√ for rated 9 kV
  ≥ 19.4 kV /√ for rated 21 kV
  • Partial discharge test
    Partial discharge shall not exceed 10 pC.
    Mounting bracket
• Dimension measurement
  5
  Dimension shall be according to MEA’s drawing no. 180903.
  • Galvanizing test
    All metal parts shall be passed the galvanizing test according to ASTM A153/A153M.

752E Drawings and Instructions
752E1 Supplier shall furnish 6 (six) copies each of the following items, at least 30 (thirty) days prior to the shipment of the equipment.
a) Dimensional drawing of surge arrester, mounting bracket, terminal
connector and other necessary accessories for complete installation.
b) Installation and operating instructions.
c) Complete part lists.
752E2 One complete set of drawings and instructions listed in clause 752E1 shall be firmly attached to or boxed with each set of the surge arrester at the time of shipment.
752E3 All drawings except standard shop drawings, characteristic curves and installation instructions shall have the contract marked thereon.
752E4 All drawings and instructions shall be in ENGLISH. Information on drawing shall be engineering lettering. Instruction manual shall be machine printed or typed. 752E5 All measurements and quantities shall be expressed in the unit of METRIC SYSTEM. If they are expressed in other system, the metric equivalent shall also be shown.
(03/19)
752F System Data
7
SPEC. NO.752: 03-2019 PAGE 5

Nominal system voltage (kV)
12
24
Rated maximum system voltage (kV)
12
24
Rated frequency (Hz)
50
50
Temporary overvoltage
Duration (sec) Earth - fault factor
Amplitude (kV) ∅-g
2
2
1.4
1.4
9.7
19.4
Installation
∅-g
∅-g
Insulation level of protected
equipment (BIL) (kV peak)
95
125
Short circuit current (kA)
16
8

752G General Requirement
752G1 The voltage ratings of the required arrester are listed in clause 752H. 752G2 Bidder shall provide graphical analysis comparing worse case system conditions versus the overvoltage withstand capability of the surge arrester.
752G3 The surge arrester shall withstand continuous operating voltage of the system listed in clause 752F: Rated maximum system voltage.
752G4 The creepage distance of surge arrester housing shall be not less than 25 mm/kVof the rated nominal system voltage E.g. 300 mm for 9 kV surge arrester (12 kV system voltage) and 600 mm for 21 kV surge arrester (24 kV system voltage).
752G5 The nameplate of surge arrester shall be identified by the following minimum information which shall appear on a nameplate permanently attached to surge arrester: -
-the purchase contract number
-rated voltage and continuous operating voltage
-rated frequency
-nominal discharge current
-rated short circuit current in kA r.m.s
-the manufacturers name or trademark, type and identification of the
complete arrester
-the year of the manufacture.
(03/19)
8
SPEC. NO.752: 03-2019
PAGE 6
752G6 The surge arrester shall be gapless metal-oxide type, single column and having polymeric housing only.Surge arrester shall be supplied completely with a mounting bracket(two carriage bolts shall be 3/8 x 4 inches, thread length minimum 3 inches)according to Dwg.no.180903.For each lot, additional 10sets of bolts, nuts and washers same as those supplied with bracket shall be
supplied for acceptance test purposed.
752G7 A protective cap shall be supplied over the high voltage terminal to afford a degree of protection to lineman or animal in case of accidental contact with the terminal.
The protective cap shall cover the terminal and the surface of top shed of arrester housing to prevent any small animal to enter inside the cap.
The protective cap shall be made of silicone rubber.
752G8 Surge arrester shall be rotated 90° clockwise and 90° counterclockwise when installed with mounting bracket.
752H Ratings and Features
The surge arrester shall have the following rating.
Material Code
5920-
474-09000
5920-
475-18000
5920-
474-09100
5920-
475-20000
Rated frequency Hz
50
Nominal discharge current kA
5
10
Rated voltage (Ur) kV
9
21
9
21
Maximum residual voltage at nominal
8/20 ∝s discharge current kV peak
30
70
27
60
Minimum current impulse withstand
High current impulse
-Peak value of high current impulse kA peak -Wave shape of current impulse ∝s Long duration current impulse
-Peak current A peak -Virtual duration of peak ∝s
65
100
4/10
75
see note 2
1,000
see note 2
Line discharge class (according to IEC 60099-4)
-
Class 1

Note 1. TOV capability of the proposed surge arrester shall be investigated for proper application with graphical analysis and be subjected to MEA’s consideration. 2. The peak current and duration of peak shall be as specified in long duration current impulse withstand test of IEC 60099-4 according to line discharge class.
(03/19)
9
SPEC. NO.752: 03-2019
PAGE 7
752I Special requirements for 5 kA Arrester Rated 9 kV and 21 kV
752I1 Each unit shall be provided with solderless clamp-type line and ground terminal connectors suitable for 16-35 mm2 copper conductor and supplied with flexible insulated copper line lead and flexible bare copper ground lead not smaller than 16 mm2. Lead length shall be 0.6 m for line lead and 0.5 m for ground lead. The set of connector shall be non-corrosive material as specified in figure 1.
752I2 Disconnector shall be supplied to assure positive protection line lockout and give visual indication of a damage surge arrester.
752J Special requirements for 10 kA Arrester Rated 9 kV and 21 kV 752J1 Each unit shall be supplied with solderless clamp type line terminal connector suitable for 35 mm2 copper conductor and ground stud terminal complete with clamp suitable for 16-35 mm2 copper conductor. The set of connector shall be non-corrosive material as specified in figure 1.
752K Additional Requirements for Packing
752K1 Each sets of surge arrester shall be individually packed in box with installation instruction and the list of materials. The package shall be strong enough to withstand external force during transportation, storage and handling. The surge arrester packed in plastic bag is not accepted.
752K2 If any parts are packed in the cartons for containerized shipment, the cartons shall be arranged into pallets so as to facilitate their movement by forklift trucks.
(03/19)
10
SPEC. NO.752: 03-2019
PAGE 8

The connector and top cap shall be made of following materials:- a) Line and ground terminal – austenitic stainless steel
b) Top cap - austenitic stainless steel or aluminum
c) Hex head nut, spring washer, round washer and lock clamp – austenitic stainless steel Figure 1. Typical drawing for surge arrester
(03/19)
11
SPEC. NO.752: 03-2019
PAGE 9
Part 3 3/8x4 inch carriage bolt.
Part 3 carriage bolt having at least
Part 4 1/2x1.5inch carriage bolt having
1.125 inch full thread with hex nut and
full thread with hex nut and
1/2inch heavy helical spring
helical spring-lock washer
(ASME B18.21.1 Table 2).
Part 5 1/2inch flat round
washer (IEEE C135.80
Figure 12).
Hole to hold the 1/2 inch
carriage bolt captive.
Detail of part 1
Detail of part 1
Note
Bracket
Thread section 3inch
long. Each with one
3/8inch round washer
and square nut.
Part 2 Back plate.
Part 2
Part 1
Four 10.5 - 11.5
overlapping square
holes
10.5 - 11.5
Square hole
Detail of part 2

1. Dimensions do not cover galvanizing, but parts should fit together after Dimensions do not cover galvanizing, but parts should fit together after
   Dimensions do not cover galvanizing, but parts should fit together after galvanizing.
2. Dimensions are shown in millimeters, except otherwise specified Dimensions are shown in millimeters, except otherwise specified.
   Dimensions are shown in millimeters, except otherwise specified
3. All fastener shall
   All fastener shall be stainless steel or galvanized steel
   MEA’s DWG. NO. 180903
   180903: Mounting bracket
   (03/19)
   12

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TECHNICAL PROPOSALS
The following pages are the forms for filling Proposed Technical Data for 9 kV and 21 kV Surge Arrester.
All blanks shall be filled in with required information and figures; otherwise it may constitute a sufficient cause for rejection of the bid.
(750T-1)
15
Proposed Technical Data for 9 kV and 21 kV Surge Arrester (sheet 1/6)
Material Code

Manufacturer


Country 


Applied standard, publication number and year 


Catalog number (to be attached)


Outline drawing number (to be attached)


Rated frequency Hz


Nominal discharge current kA 


Rated voltage (Ur) kV 


Maximum continuous operating voltage kV 


Main Element 

Manufacturer
Country
Confirm to be gapless metal-oxide type (yes or no)

Housing  

Manufacturer
Country
Material (Silicone rubber, EPDM etc.)
Creepage distance mm Confirm to attached moisture ingress test (yes or no)

(752T-2) (03/17)
16
Proposed Technical Data for 9 kV and 21 kV Surge Arrester (sheet 2/6)
Material Code

Confirm to attached weathering ageing test or track  and erosion test with test (yes or no)  

Confirm to attached short circuit test (yes or no)

Minimum insulation withstand voltage 

Impulse withstand voltage kV peak

Power frequency withstand voltage 

Dry, 1 minute kV
Wet, 10 seconds kV

Range of reference voltage of an arrester kV peak /√ 2


Reference current of an arrester mA peak


Residual voltage  

Maximum residual voltage at
nominal discharge current kV peak Waveshape of current impulse ∝s

Current impulse withstand 

High current impulse
Peak value of high current impulse kA peak Waveshape of current impulse ∝s

(752T-3) (03/17)
17
Proposed Technical Data for 9 kV and 21 kV Surge Arrester (sheet 3/6)
Material Code

Long duration current impulse  

Peak current A peak Virtual duration of peak ∝s

Operating duty  

Peak value of current impulse A peak Waveshape of current impulse ∝s

Short circuit test 

Minimum prospective symmetrical
fault current kA

Terminal connectors  

Line terminal
Type of connector (clamp type, etc.)
The material of line terminal, hex head nut, spring washer, round washer and lock clamp.
Confirm to be austenitic stainless steel (yes or no) The material of top cap.
(austenitic stainless steel or aluminum)
Conductor size to be accommodated with mm2

(752T-4) (03/17)
18
Proposed Technical Data for 9 kV and 21 kV Surge Arrester (sheet 4/6)
Material Code

Ground terminal  

Type of connector (clamp type, etc.)
The material of line terminal, hex head nut, spring washer, round washer and lock clamp.
Confirm to be austenitic stainless steel (yes or no) Conductor size to be accommodated with mm2

Protective cap 

Confirm to supply protective cap (yes or no)
Confirm to cover the terminal and the surface of top shed of arrester housing (yes or no)

Confirm to supply disconnector (yes or no) 


Confirm to supply insulating hanger (yes or no) 


Mounting bracket  

NEMA Type
Material
Applicable standard for galvanizing
Drawing number showing detailed of mounting to crossarm (to be attached)

(752T-5) (03/17)
19
Proposed Technical Data for 9 kV and 21 kV Surge Arrester (sheet 5/6)
Material Code

Insulated line lead conductor  

Copper or aluminum conductor
Confirm to be flexible type (yes or no)
Conductor size mm2 Number of wires/strands
Insulation material (XLPE, PE or PVC etc.)
Nominal thickness of insulation mm Length mm

Ground lead conductor  

Copper or aluminum conductor
Bare or Insulated type
Confirm to be flexible type (yes or no)
Conductor size mm2 Number of wires/strands
Conductor size mm2 Length mm
Confirm to supply with the solderless clamp-type connector for line and ground side (yes or no)

(752T-6) (03/17)
20
Proposed Technical Data for 9 kV and 21 kV Surge Arrester (sheet 6/6)
Material Code

Packing detailed drawing number (to be attached) 


Confirm to be packed individually for each kit (yes or  no) 


Net weight kg 

(752T-7) (03/17)
21
แบบฟอรมขอเสนอที่แตกตางจากขอกําหนดของการไฟฟานครหลวง (DEVIATION FROM MEA’S SPECIFICATION FORM)
ลําดับที่ (No.)
ขอกําหนดของ
กฟน. หนา
(MEA’s Spec. Page)
ขอกําหนดของ
กฟน. ขอ
(MEA’s Spec. Clause)
รายละเอียดขอกําหนดที่ กฟน .ตองการ (MEA’s Requirement)
ขอเสนอที่แตกตางจากขอกําหนดของ กฟน. (Proposal)