Request for Quotation and Price Comparison for Transformer Oil Testing

Since its major overhaul and commissioning in July 2022, the oil-immersed transformer manufactured by Chongqing Sote Salt & Chemical Co., Ltd. has been in operation for nearly two years. In accordance with the requirements of the preventive testing procedures for power equipment DL/T 596-2021, it is now necessary to conduct oil analysis on the in-service oil-immersed transformers, so as to gain a better understanding of their operational status, promptly detect any abnormalities or defects, prevent operational accidents, and ensure the safe and stable operation of the company’s power supply and distribution system. The technical requirements are hereby specified as follows:
I. Scope of Testing and Main Technical Parameters:
1. Scope of the test:
Serial No. Process Section Equipment Name Specification and Model Test Content
1. Sote Substation – Connection Transformer SZ10-31500/110kV – Transformer Oil Testing (including dielectric loss and volume resistivity, water-soluble acid value and pH, breakdown voltage, acid value, closed-cup flash point, moisture content, and chromatographic analysis)
2 Sote Station Mine Isolation Transformer S13-6300/10.5kV Transformer Oil Testing (including dielectric loss and volume resistivity, water-soluble acid value and pH, breakdown voltage, acid value, closed-cup flash point, moisture content, and chromatographic analysis)
3 Salt Mining Area Mine Brine Transfer Station S9-800/10KV
4 Salt Mining Area – Phase I Brine Treatment Facility – S7-630/10kV
5 Salt Mining Area – Phase II Brine Treatment Facility – S9-1000/10kV
6 Salt Mining Area – Phase II Water Intake Modification – S9-800/10kV
7 Salt Mining Mine – Slag Injection and Medication Mixing Unit – S7-1250/10kV
8 Salt Production Section Salt Packaging Modification S9-1250/10KV
9 Salt Production Section – Salt Drying Unit No. 1 Transformer – S9-1250/10KV
10 Salt Production Section – Salt Drying No. 2 Transformer – S9-1250/10kV
11 Salt Production Section – Salt Evaporation Unit No. 1 Transformer – S9-1600/10KV
12 Salt Production Section – Salt Evaporation Unit No. 2 Transformer – S9-1600/10KV
13 Salt Production Section – Salt Production Circulating Water No. 1 Transformer – S9-1600/10KV
14 Salt Production Section – Salt Production Circulating Water No. 2 Transformer – S9-1600/10KV
15 Salt Production Section – Salt Production Circulating Water No. 3 Transformer – S7-800/10KV
16 Water intake from the riverbank Thermal power plant—riverbank water intake modification S7-800/10KV

2. Test Content and Requirements
(1) Conduct the test in accordance with the requirements of DL/T596-2021, "Preventive Test Procedures for Power Equipment."
(2) Transformer oil testing items: dielectric loss and volume resistivity, water-soluble acid value and pH value, breakdown voltage, acid value, closed-cup flash point, moisture content, and chromatographic analysis. For each piece of equipment, data analysis will be conducted to identify any equipment with abnormal test results, and preliminary conclusions will be drawn.
(3) Based on the test results, submit a test report and provide maintenance recommendations.
(4) After the oil sample is sent for testing, the test shall be completed within 7 working days. Upon completion of the test, please submit two hard copies of the official test report to us, stamped with the official seal.
II. Bidding Requirements
1. Business license, qualification requirements, and safe production conditions
(1) Possess a valid business license for corporate legal entities, with registered capital of no less than 10 million yuan.
(2) Possess a Level 3 or higher license for the maintenance (testing) of power facilities.
(3) Personnel engaged in testing must obtain qualification for conducting electrical testing operations on the grid, as approved and issued by the National Energy Administration.
(4) Possesses five years of experience in conducting tests on power equipment rated 110 kV and above within the State Grid’s power system.
V. Referenced Standards
1. DL/T596 “Code for Preventive Testing of Power Equipment”
6. Project Acceptance
1. Upon completion and acceptance of the project, the contractor shall hand over the following materials and documents:
(1) Two copies of the test report.
2. Acceptance testing shall be conducted strictly in accordance with DL/T596-2021 “Preventive Test Procedures for Power Equipment.” Our company will organize relevant departments to carry out acceptance and confirmation.

Contact: Cheng Miaomiao Phone: 18323686323