Technical Specification For Operation Of Drop-out Fuses (2025 Edition)
Environmental status assessment
... High Voltage Fuse Opening and closing operation process
... 1. Installation of fuse tube: Adjust the inclination angle of RW3-10 fuse tube to 25°±2°, and ensure that the engagement depth of duckbill contact is ≥2/3 of the tube body length.
2. Operation execution: Use the insulating rod to push the fuse tube in a "slow-fast-slow" rhythm. The instantaneous speed of contact contact must reach 0.5m/s. After closing the switch, the angle between the fuse tube axis and the vertical line is ≤5°.
3. Status confirmation: Use the intelligent electrometer to detect the contact on-resistance (standard value ≤50μΩ). For HPRWG series products, observe that the indicator light of the wireless monitoring module turns green.
... ... 3. Drop monitoring: After the melting tube is completely tripped, check that the distance between the falling track of the tube and the grounding body is greater than 300mm to prevent secondary failure caused by mechanical collision.
3. Special working conditions disposal plan
When the wireless temperature measurement module alarms (threshold 75°C), the "two-person collaborative operation method" is adopted: the main operator controls the insulating rod, and the deputy operator uses an infrared thermal imager to monitor the contact status in real time, and the opening speed is reduced to 60% of the normal operation.
... For PRWG2-35 products, it is necessary to first clear the ice on the insulator shed. During operation, the axial vibration method (frequency 2Hz, amplitude 5mm) is used to break the contact freezing. Violent knocking on the melting tube is prohibited.
IV. Quality control and post-evaluation
Equipment status re-inspection
Carry out special inspection within 24 hours after operation to detect parameters such as contact temperature rise (standard ΔT≤65K), axial deviation of melting tube (allowable error ±3mm), etc. The HPRWG series needs to additionally check the engagement of the windproof lock.
