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Inspection Rules for 3–35 KV High-Voltage Switchgear at the Time of Factory Exit. Document Number: ***** Prepared by, Reviewed by, Approved by: XXXX Co., Ltd. Year/Month. Item Name, Inspection Content, Technical Requirements, Inspection Results: 1 Structural inspection: 1.1 Appearance – The product’s nameplate should be clean, with clear markings and correct data. 1.2 The coating color should be uniform, with no bubbling, peeling, or defects. 1.3 The continuity of the grounding system must meet specified requirements. 1.4 The grounding frame (cabinet body) must have a good connection to the ground. 1.5 The primary and secondary wiring schemes, wiring arrangements, and components must comply with the requirements outlined in the drawings and technical documents. 1.6 The phase sequence, arrangement, and color coding of the busbars must be correct; colors: Phase A: Yellow, Phase B: Green, Phase C: Red. 1.7 The electrical clearance between phases and between phases and the ground must be at least 125 mm for 12 kV systems□； 40.5kV: Not less than 300mm □ 1.8 Inter-phase center distance: 460mm □ 350mm □ 300mm □ 275mm □ 250mm □ 230mm □ 220mm □ 210mm □ 165mm □ 2 Mechanical characteristic tests 2.1 Closing time (s): Refer to the operating instructions and test reports of the corresponding circuit breaker. 2.2 Opening time (s) 2.3 Travel distance of oil cushioning mechanism (mm) 2.4 Average closing speed (m/s) 2.5 Average opening speed (m/s) 2.6 Contact separation distance (mm) ABC 2.7 Contact travel distance (mm) ABC 2.8 Synchronization of three-phase contact opening (ms) ABC 2.9 Contact bouncing time during closing (ms) ABC ` 3 Mechanical operation tests 3.1 Perform 5 manual and 5 electric closing and opening operations of the circuit breaker; the operations should be flexible and error-free. 3.2 Perform 5 closing and opening operations at low voltage: Charge the circuit breaker at 85% of the rated voltage for closing, and at 65% of the rated voltage for opening; these operations should be correct and error-free. 3.3 Perform 5 closing and opening operations under overvoltage conditions: Charge the circuit breaker at 110% of the rated voltage for closing, and at 120% of the rated voltage for opening; these operations should be correct and error-free. 3.4 Perform 5 operations using the current trip device: The circuit breaker should open when exposed to an instantaneous alternating current of 5A; these operations should be correct and error-free. 3.5 Insert and remove the removable components 5 times each; the insertion and removal should be flexible and reliable. 3.6 Removable components of the same model and specifications should be interchangeable without any jamming or interference. 4. Interlock tests Five-protection interlock operation tests: The five-protection interlocks must meet the requirements specified in the technical specifications of the respective switchgear. 5.1 1-minute power-frequency withstand voltage test 5.1 Power-frequency withstand voltage tests between phases and between phases and ground: 12kV: 42kV□ ； 40.5kV: 95kV□ 5.2 Breaks Power-frequency Withstand Voltage Test 12kV: 48kV□ ； 40.5kV: 118kV □ 5.3 Secondary circuit: 2kV 6. Check for correct wiring: 6.1 Verify that the wiring is in accordance with the schematic diagrams and wiring plans. 6.2 Ensure that the operating principle is correct; the operation should be in line with the schematic diagrams. 7. Measurement of main circuit resistance: Rated current of the main circuit (A), Main circuit resistance (μΩ) (excluding the resistance of transformers): ≤630, ≤400; ≤1250, ≤200; ≤1600, ≤150; ≤2000, ≤100; ≤3150, ≤60. 8. Product cleanliness: Check whether the product is clean, free from any debris or dust. The product should be tidy, without any debris or dust. 9. Technical documents and spare parts accompanying the product: All necessary technical documents and spare parts should be included with the product. Inspector: Appendix: Model numbers, specifications, and factory serial numbers of the main primary components. Product quality conclusion: The product meets the requirements of standard GB3906; it has passed the tests and is approved for release. Sequence number, component model number and specifications, manufacturer, factory serial number: 1, 2, 3