ประกวดราคาซื้อลูกรอกแรงต่ำ แบบ ข (แบบ 53-2) จำนวน 351,400 ลูก และ ลูกถ้วยยึดโยง แบบ ง (แบบ 54-4) จำนวน 16,300 ลูก เลขที่ กจพ2-ลถ-023-2569

• To specify the technical requirements for insulators used in overhead HV (up to 115 kV) and LV lines.
• To ensure that the supplied insulators meet the required quality, safety, and performance standards.
• To define the testing procedures and acceptance criteria for insulators.

• Supply of insulators for overhead HV (up to 115 kV) and LV lines.
• Manufacturing and testing of insulators in accordance with specified standards (TIS, ANSI, IEC).
• Provision of design/type test reports and/or certificates.
• Submission of samples for testing.
• Compliance with specific material and construction requirements (e.g., brown glazed porcelain, zinc thimble threads).
• Marking of insulators with manufacturer details, test loads, and PEA trademarks.
• Conducting special tests such as power arc test and steep wave front impulse test as required.

• Insulators for overhead HV (up to 115 kV) and LV lines.
• Two (2) samples of each insulator item within five (5) working days from the bid closing date.
• Design/type test reports and/or design/type test certificates.
• Other relevant documentation as specified in the TOR.

• Not explicitly stated in the provided text, but sample submission is required within five (5) working days from the bid closing date.
• Design/type test reports from laboratories in Thailand or local manufacturers shall be valid within five (5) years from the issued date to the bid closing date.

• Eligibility Requirements:
  • Manufacturers must be able to produce insulators according to the specifications.
  • Bidders must be able to supply the required samples.
  • Bidders must submit valid design/type test reports and/or certificates.
• Standards Compliance:
  • Manufacturers must comply with Thai Industrial Standards (TIS), American National Standards Institute (ANSI), and International Electrotechnical Commission (IEC) standards as listed.
  • PEA will accept reports in accordance with later editions of the standards, or previous editions if no significant changes or additional tests are required.
• Experience:
  • Not explicitly stated in terms of years in business or specific project experience.
• Previous Project Cost:
  • Not specified.
• Technical Capabilities:
  • Ability to manufacture insulators with specific material properties (e.g., high-grade alumina porcelain, brown glaze).
  • Ability to perform or obtain reports for various tests including thermal-mechanical load cycle test, electromechanical and mechanical failing load tests, power arc test, and steep wave front impulse test.
  • Ability to conduct or have tests conducted by acknowledged testing laboratories/institutes.
• Personnel:
  • Not explicitly stated in terms of employee qualifications or staffing levels.
• Exclusions: Basic requirements such as a valid business license or legal entity status are assumed but not explicitly detailed in this excerpt.

• Compliance with technical specifications.
• Successful passing of design/type tests, quality conformance tests, and routine tests.
• Acceptance of samples based on PEA’s testing procedures.
• Validity and acceptability of design/type test reports from acknowledged testing laboratories/institutes.
• PEA reserves the right to reject bidders who cannot supply requested samples or whose samples fail testing.
• PEA reserves the right to send representatives to inspect and witness tests.

• Insulators for overhead HV (up to 115 kV) and LV lines.
• Material: Porcelain insulators shall be brown glazed. Pin hole threads of pin type insulators shall be zinc thimble. Suspension insulator shells of porcelain type shall be made of highest grade, dense, homogeneous, wet-process, high strength alumina porcelain.
• Construction: Surface shells of suspension insulators shall be relatively smooth. Porcelain head of suspension insulator shall be cylindrical headed with sand surfaces. Line-post and pin-post insulators shall have porcelain part factory-fixed with stud, washer, nut, and lock nut.
• Marking: Legible and durable marking including manufacturer’s name/trademark, year of manufacture, test load/strength (for suspension insulators), power arc current/duration (for line-post/pin-post insulators), and PEA’s trademark.
• Testing: Must pass all design/type tests, quality conformance tests, and routine tests according to TIS, ANSI, or IEC. Specific tests include thermal-mechanical load cycle test, electromechanical and mechanical failing load tests (with specific acceptance criteria R - RS = QS ≥ 3 / S), power arc test, and steep wave front impulse test.
• Cement: If Portland cement is used, it must have an autoclave expansion limit of less than 0.12 percent (ASTM C 151-84 or later).

• Payment schedule: Not specified in the provided text.
• Penalties: Not specified in the provided text.
• Cost of all tests and reports shall be borne by the Bidders/Contractor.
• Samples shall not be returned.

• Q: ฉนวนประเภทใดบ้างที่ครอบคลุมในข้อกำหนดนี้?
  A: ข้อกำหนดนี้ครอบคลุมฉนวนสำหรับสายส่งอากาศแรงดันสูง (HV) สูงสุด 115 kV และแรงดันต่ำ (LV) รวมถึงฉนวนแบบ Spool-type, Pin-type, Strain-type, Suspension-type, Line-post type, และ Pin-post type.
  • Q: มาตรฐานใดบ้างที่ใช้ในการผลิตและทดสอบฉนวน?
    A: มาตรฐานที่ใช้ ได้แก่ Thai Industrial Standards (TIS), American National Standards Institute (ANSI), และ International Electrotechnical Commission (IEC) ตามที่ระบุในเอกสาร
  • Q: ผู้เสนอราคาต้องส่งตัวอย่างฉนวนเมื่อใด?
    A: ผู้เสนอราคาต้องจัดส่งตัวอย่างฉนวนจำนวน 2 ตัวอย่างต่อรายการ ภายใน 5 วันทำการนับจากวันที่ปิดการเสนอราคา
  • Q: รายงานผลการทดสอบต้องมาจากหน่วยงานใด?
    A: รายงานผลการทดสอบต้องมาจากห้องปฏิบัติการ/สถาบันที่ได้รับการยอมรับ เช่น ห้องปฏิบัติการอิสระที่ได้รับการรับรองตาม TIS 17025 หรือ ISO/IEC 17025 หรือหน่วยงานของรัฐที่เกี่ยวข้อง เช่น MTEC, PTEC, TISI
  • Q: มีข้อกำหนดพิเศษสำหรับการทดสอบฉนวนประเภทใดบ้าง?
    A: สำหรับฉนวน Line-post และ Pin-post ต้องผ่านการทดสอบกำลังไฟฟ้าอาร์ค (Power Arc Test) สำหรับฉนวน Suspension ต้องผ่านการทดสอบแรงดันคลื่นกระตุ้นฉับพลัน (Steep Wave Front Impulse Test) และการทดสอบกำลังไฟฟ้าอาร์ค
  • Q: เกณฑ์การยอมรับสำหรับการทดสอบกำลังไฟฟ้าทางกลและไฟฟ้าเป็นอย่างไร?
    A: เกณฑ์คือ QS ≥ 3 โดยที่ QS คือเกณฑ์การตัดสิน, R คือค่าเฉลี่ยจากการทดสอบ, RS คือค่ากำลังไฟฟ้าทางกลและไฟฟ้าที่กำหนด, และ S คือค่าเบี่ยงเบนมาตรฐานจากการทดสอบ
  • Q: ฉนวนพอร์ซเลเลนต้องมีสีอะไร?
    A: ฉนวนพอร์ซเลเลนต้องเป็นสีน้ำตาลเคลือบ (brown glazed)
  • Q: ข้อกำหนดสำหรับหัวฉนวนแบบ Suspension Type คืออะไร?
    A: หัวฉนวนแบบ Suspension Type ที่ทำจากพอร์ซเลเลนต้องมีลักษณะเป็นทรงกระบอกพร้อมพื้นผิวทราย (cylindrical headed with sand surfaces) และจะไม่ยอมรับหัวฉนวนรูปหางนกยูง (dove tail)
  • Q: หากใช้ปูนซีเมนต์ปอร์ตแลนด์ในการประกอบฉนวน มีข้อกำหนดอย่างไร?
    A: ปูนซีเมนต์ปอร์ตแลนด์ต้องมีค่าการขยายตัวจากการอบ (autoclave expansion) น้อยกว่า 0.12 เปอร์เซ็นต์ ตามมาตรฐาน ASTM C 151-84 หรือฉบับที่ใหม่กว่า
  • Q: ผู้เสนอราคาต้องรับผิดชอบค่าใช้จ่ายใดบ้าง?
    A: ผู้เสนอราคา/ผู้รับจ้างจะต้องรับผิดชอบค่าใช้จ่ายในการทดสอบและจัดทำรายงานทั้งหมด

PROVINCIAL ELECTRICITY AUTHORITY
TECHNICAL SPECIFICATION DIVISION
INSULATORS
Specification No.: RINS-002/2561
Approved date: 21/05/2561
Rev. No.: 2
Form No. 01-1
Page 1 of 9
C Material, equipment, and specifications for INSULATORS
C1 General material and packing instructions
Additional to the general instructions, the following shall be observed :
1a Scope
These specifications cover insulators for overhead HV (up to 115 kV) and LV lines.
1b Standard
The insulators shall be manufactured and tested in accordance with the following standards:
Thai Industrial Standards (TIS)
TIS 227 - 2525 Spool-type porcelain insulators
TIS 279 - 2521 Pin-type porcelain insulators
TIS 280 - 2525 Strain-type porcelain insulators
TIS 354 - 2523 Suspension-type porcelain insulators
TIS 563 - 2528 Suspension-type toughened glass insulators
TIS 1077 - 2535 Line-post type porcelain insulators
TIS 1251 - 2537 Pin-post type porcelain insulators
American National Standards Institute (ANSI)
ANSI C29.1 - 1988 Test methods for electrical power insulators
ANSI C29.2A - 2013 Wet-process porcelain and toughened glass – distribution suspension type ANSI C29.2B - 2013 Wet-process porcelain and toughened glass – transmission suspension type ANSI C29.9 - 2017 Wet-process porcelain insulators – apparatus, post – type
International Electrotechnical Commission (IEC)
IEC 60383-1 -1993 Insulators for overhead lines with a nominal voltage above 1000 V – Part 1: Ceramic or glass insulator units for a.c. systems – Definitions, test methods
and acceptance criteria
And all other relevant standards, unless otherwise specified in these specifications.
PEA will accept the design/type test reports in accordance with the later edition of the above standards.
PEA will also accept the design/type test report in accordance with the previous edition of the above standards, if there is no significant change in any test items or no additional test item(s) compared with the above standards. On the other hand, if there is significant change in any test items or there are any additional test items, the previous edition type test report with the additional test report(s) of the significant change test item(s) and/or additional test item(s) will be also accepted.
III

PROVINCIAL ELECTRICITY AUTHORITY
TECHNICAL SPECIFICATION DIVISION
INSULATORS
Specification No.: RINS-002/2561
Approved date: 21/05/2561
Rev. No.: 2
Form No. 01-1
Page 2 of 9
1c Principal requirement
1c.1 General
The porcelain insulators shall be brown glazed.
The pin hole threads of the pin type insulators shall be zinc thimble according to TIS .
The insulator shells of suspension insulator of porcelain type shall be made of highest grade, dense, homogeneous, wet-process, high strength alumina porcelain.
The surface shells of suspension insulator of porcelain type exposed after the assembly shall be relatively smooth and free of imperfections.
The porcelain head of the suspension insulator shall be cylindrical headed with sand surfaces; the “dove tail” shaped head shall not be accepted.
For the line-post insulator and pin-post insulator, the porcelain part shall be factory-fixed with stud, washer, nut, and lock nut.
1c.2 Marking
Each insulator shall be marked legibly and durably, as follows :
(1) Manufacturer’s name and/or Trade-mark.
(2) Year of manufacture.
(3) Only for suspension insulators :

• Tension-proof test load in kN, identified by the word “TEST”.
• Combined mechanical and electrical strength in kN, identified by the symbol “M&E,
  except that of class 52-1.
  (4) Only for line-post insulator and pin-post insulator : Magnitude of the power arc current in kA and duration in second, identified by the word “POWARC”.
  (5) PEA’s trademark, as the figure shown.
  (6) Others according to manufacturer’s design.
  1c.3 Sample
  The bidders have to supply two (2) samples of each item of the insulators within five (5) working days counted from bid closing date. The bidders who cannot supply the requested samples shall be rejected.
  PEA reserves the right to test the samples according to PEA’s testing procedure. In case of the failing test results, the bidders shall be rejected.
  The samples shall not be returned.
  III

PROVINCIAL ELECTRICITY AUTHORITY
TECHNICAL SPECIFICATION DIVISION
INSULATORS
Specification No.: RINS-002/2561
Approved date: 21/05/2561
Rev. No.: 2
Form No. 01-1
Page 3 of 9
1c.4 Tests and test reports
HV insulators and LV insulators shall be passed all item of design/type tests, quality conformance tests and routine tests in accordance with the relevant TIS or ANSI or IEC.
The design/type tests for suspension insulator, line-post insulator and pin-post insulator shall conform to as follows :
(1) The proposed HV insulators shall have successfully passed the design/type test in accordance with the relevant standard.
For suspension insulator, thermal-mechanical load cycle test in accordance with the ANSI, or thermal-mechanical performance test in accordance with the IEC, shall be included.
(2) The additional acceptance criteria for determining conformance with PEA’s requirements for thermal-mechanical load cycle test (or thermal-mechanical performance test) and combined
mechanical and electrical strength tests (or electromechanical and mechanical failing load
tests) shall be as follows :

R - RS = QS ≥ 3
S
Where :
QS = Criteria of judgement for acceptance
R = Average value obtained from the test
RS = Rated Mechanical and Electrical strength value of the insulator
S = Standard deviation from the test
Each value measured shall not be lower than the rated Mechanical and Electrical strength;
electrical puncture shall not occur before reaching ultimate failure.
Sample size shall be of ten (10) units.
The insulators shall be passed the special tests as follows :
For line-post insulator and pin-post insulator : power arc test (see Appendix 1).
For suspension insulator : steep wave front impulse test and power arc test (see Appendix 2). If Portland cement is used in the assembly of the insulators, it shall have an autoclave expansion limit of less than 0.12 percent when tested in accordance with ASTM C 151-84 or later edition, Test method for autoclave expansion of portland cement.
III

PROVINCIAL ELECTRICITY AUTHORITY
TECHNICAL SPECIFICATION DIVISION
INSULATORS
Specification No.: RINS-002/2561
Approved date: 21/05/2561
Rev. No.: 2
Form No. 01-1
Page 4 of 9
The design/type tests and the special tests shall be conducted or inspected by the acknowledged testing laboratories/institutes as following:
(1) Independent laboratories/institutes which are members of the Short-circuit Testing Liaison (STL) or independent laboratories/institutes which are accredited according to TIS 17025 or ISO/IEC 17025 with the scope of accreditation covered the relevant test items, standards and equipment. The certification and scope of accreditation of the independent laboratories/institutes shall be submitted with the bid for consideration.
(2) Thailand’s national laboratories, institutes, universities and electric utilities, as follows:

• National Metal and Materials Technology Center (MTEC)
• Electrical and Electronic Products Testing Center (PTEC)
• Thai Industrial Standards Institute (TISI)
• Electrical and Electronics Institute (EEI)
• Department of Science Service (DSS)
• Testing Laboratory, Electrical Engineering Department, Faculty of Engineering, Chulalongkorn University
• Electricity Generating Authority of Thailand (EGAT)
• Metropolitan Electricity Authority (MEA)
• Provincial Electricity Authority (PEA)
• Other laboratories, institutes, universities or electric utilities approved by PEA
  The bidders or manufacturers who prefer to carry out the insulators with the laboratories or by the manufacturer themselves without the qualification mentioned above, the detail of the test facilities of the laboratories or the manufacturer shall be submitted to PEA for approval before proceeding the tests and before the bid closing date. PEA reserves the right to send representatives to inspect and witness the tests with the cost of the bidders or manufacturers.
  The design/type test report done by the laboratories in Thailand or local manufacturers shall be valid within five (5) years counted from the issued date in the test report to the bid closing date.
  The bidders have to submit the design/type test reports and/or design/type test certificates of the insulators with the bid.
  III

PROVINCIAL ELECTRICITY AUTHORITY
TECHNICAL SPECIFICATION DIVISION
INSULATORS
Specification No.: RINS-002/2561
Approved date: 21/05/2561
Rev. No.: 2
Form No. 01-1
Page 5 of 9
PEA will also accept other documents instead of the design/type test reports and design/type test certificates in the following conditions:
(1) In case the proposed insulators has been supplied to PEA and get the order from PEA’s Procurement Department (from PEA’s head office), the Purchase Order (PO) can be submitted, or (2) In case the proposed insulators has been registered for PEA Product Acceptance, the not-expired registration certificate counted to the bid closing date can be submitted, or
(3) In case the proposed insulators has been registered for Product lists for substation turnkey project, the not-expired registration certificate counted to the bid closing date can be submitted instead
However the document in case (1) and (2) shall be proved that the insulators specified in the PO or registration certificate shall be the same product, type/model and all ratings as the proposed insulators for this bid and shall be used the same PEA’s specification number. In case (3), the insulators specified in the registration certificate shall be the same product, type/model and all ratings as the proposed insulators for this bid.
The cost of all tests and reports shall be borne by the Bidders/Contractor.
III