Evaluation Standard for 110 (66) kV ~ 500 kV Voltage Transformer (Trial) 1 General 1.1 This evaluation standard is formulated to strengthen the whole process management of voltage transformer equipment, timely grasp the status of voltage transformer equipment at each stage, formulate targeted measures to prevent equipment accidents, and comprehensively improve the management level of voltage transformer equipment. 1.2 This standard is formulated based on the current relevant standards, regulations and specifications of the state, industry and State Grid Corporation, and combined with the analysis of the production and operation of voltage transformers in the State Grid Corporation system in recent years and the equipment operation experience. 1.3 This evaluation standard specifies the evaluation items, evaluation requirements and evaluation methods for the whole process of voltage transformers before equipment commissioning (including design selection, on-site installation, handover acceptance), operation and maintenance, overhaul, technical supervision, and technical transformation. 1.4 This evaluation standard is applicable to the evaluation of voltage transformers (excluding their secondary parts) of the State Grid Corporation system with a voltage level of 110 (66) kV ~ 500 kV. 1.5 Reference standards and regulations The evaluation of voltage transformers shall comply with the following standards, specifications and relevant technical requirements. When the contents of relevant standards, procedures and specifications change, the latest version shall be used. When the following standards are inconsistent, the more stringent standard shall be adopted. GB311.1—1997 Insulation coordination of high-voltage transmission and transformation equipment GB1207—1997 Voltage transformer GB/T4703—2001 Capacitor voltage transformer GB/T4705—1992 Coupling capacitor and capacitive voltage divider GB/T7252—2001 Guidelines for analysis and judgment of dissolved gases in transformer oil GB50150—1991 Electrical installation engineering Electrical equipment acceptance test standard GB/T4109—1999 Technical conditions for high-voltage bushings DL/T726—2000 Technical conditions for ordering voltage transformers for power DL/T596—1996 Preventive test procedures for power equipment DL727-2000 Guidelines for operation and maintenance of transformers IEC 60815-1986 Guidelines for the selection of insulators under contaminated conditions State Grid Corporation of China \"110 (66) kV ~ 500 kV voltage transformer technical standards\" State Grid Corporation of China \"110 (66) kV ~ 500 kV transformer operation specifications\" State Grid Corporation of China \"110 (66) kV ~ 500 kV transformer maintenance specifications\" State Grid Corporation of China \"110 (66) kV ~ 500 kV transformer technical supervision regulations\" State Grid Corporation of China \"110 (66) kV ~ 500 kV transformer accident prevention measures\" State Grid Biotechnology \"State Grid Corporation of China\'s 18 major grid anti-accident measures\" State Grid Corporation of China \"Substation Operation Management Specifications\"
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