Mandatory/Essential Requirements
Vendors shall follow and meet the following Mandatory/Essential Requirements. Offers not complying to the following shall be
rejected and not to be considered for Evaluation:
| No. | Description | Yes | No | Remarks |
| | The Tenderer shall supply Numerical Protection Relays that fully comply with the EWA ETD specifications as detailed in the attached list. Alternatively, if the specified relay is obsolete or nearing obsolescence, the Tenderer may propose an upgraded relay, provided that official proof from the OEM must be submitted for all of the following. Failure to comply shall result in rejection of the offer: • Confirmation that the specified relay is obsolete or nearing obsolescence. • The proposed upgraded relay must belong to the same product family and be manufactured by the same factory as in the attached list. • The proposed upgraded relay must be suitable for transmission voltage levels above 33 kV. (The proof must be a reference list from the OEM indicating the country of supply, and transmission-level clients where the same relay model has been successfully delivered and installed) | | | |
| 2 | The tenderer is required to submit a letter from the Original Equipment Manufacturer (OEM) confirming a 10-year warranty for the product | | | |
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Numerical Protection Relay List:
Category | Type / Function | Ref. No. | Model No. | Manufacturer | Country of Origin |
Numerical Protection Relay | Line Differential Relay | 1 | REL670 | ABB | Sweden |
2 | RED670 | ABB | Sweden |
3 | 7SD8021 Siprotec-4 | Siemens | Germany |
4 | 7SD8031 Siprotec-4 | Siemens | Germany |
5 | 7SD522 Siprotec-5 | Siemens | Germany |
6 | 411-L | SEL | U. K |
7 | SEL-411L | SEL | USA |
8 | SEL-787L | SEL | USA |
Overcurrent & Earth Fault Relay / High Impedance Protection Relay | 1 | 7SJ80 | Siemens | Germany |
2 | Siprotec-4 | Siemens | Germany |
3 | SEL-751 | SEL | USA |
4 | SEL-351 | SEL | USA |
5 | REF-615 | ABB | Finland |
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The objective of this project is retrofit 66 kV Feeder outdated protection Panel Relays in ETD 66kV Substations. Mentioned substations are electromechanical and static pilot wires-based relays and those relays with the associated accessories are in service for more than 20-40 years and subjected for replacement. The normal life of a protection relay is from 15 to 20 years, following are some major justification points:
● More often to mal-operates
● Communications error and hardware failure
● Unavailability of spares and overpriced
● Aged, outdated and black-listed
● Poor performance
This upgrade aims to enhance the safety, reliability, and performance of our electrical system. The scope of work includes the removal of obsolete protection relays, installation of new state of the art protection relays, and ensuring seamless integration with the existing infrastructure.
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هدف هذا المشروع هو تحديث لوحة مرحل مغذّي 66 كيلوفولت في محطات نقل الكهرباء الرئيسية. لوحة مرحل مغذّي 66 كيلوفولت في محطات نقل الكهرباء الرئيسية يعمل منذ أكثر من 20 عامًا وهي بحاجة إلى استبدال. العمر الافتراضي للمعدات يتراوح بين 15 إلى 20 عامًا، وفيما يلي بعض الأسباب الرئيسية لإستبدال المعدات
· كثرة الأعطال والخلل في التشغيل.
· أخطاء في الاتصال وفشل في الأجهزة.
· عدم توفر قطع الغيار وارتفاع تكلفتها.
· تقادم المعدات وتجاوزها الحد المسموح وعدم اعتمادها.
· ضعف الأداء.
يهدف هذا التحديث إلى تعزيز السلامة والموثوقية والأداء العام لنظامنا الكهربائي. وتشمل نطاق الأعمال إزالة محولات الحماية القديمة، وتركيب محولات حماية حديثة ومتطورة، وضمان التكامل السلس مع البنية التحتية الحالية.