GE prolec VR-1 Installation, Operation And Maintenance Manual

Also see for VR-1: Installation operation & maintenance

GEH-7299A: Installation, Operation and Maintenance Manualfor Type VR1™ Single-Phase, Step Type Regulatorsprolec.energy/prolecge265.4 Contact InspectionTable 7 is given as a guide for inspecting the contacts of the regulator based on minimum life. It should be used for the firstinspection. It is recognized that many variables affect the contact life such as load factor, overload, service, short circuit, etc.Total contact life can be determined after this inspection based on the amount of arcing material left in proportion to that whichhas been eroded.Refer to the regulator nameplate for the rating; then determine the contact inspection point from Figure 14.On the same basis, other VR-1 regulators rated less than 100 kVA and not appearing in Table 7 can operate in excess of 1million tap changes before inspection is required. This equates to more than 25 years for normal service. Variables affectingcontact life must be considered.The moving contacts and the tips of the stationary contacts are made of an arc-resistant material as shown in Sketch A.,Figure 14. Note dimensions in Table 6.Normal contact wear will produce a contact erosion. (See Sketch B., Figure 14.)The contacts are satisfactory for service until either the stationary or moving contacts are worn to the condition shown inSketch C., Figure 14., at which time the entire set of stationary and moving contacts must be replaced.Switch T LLow Current 0.188 (4.8) 0.125 (3.2)Mid Current 0.250 (6.4) 0.156 (4)High Current & High Voltage 0.250 (6.4) 0.188 (4.8)Table 6. Arconite Dimensions in Inches (mm) on Stationary ContactsReference Number R2033Figure 14. Contact Wear (See Tables 6 and 7)