| 摘要 |
<p>PURPOSE:To facilitate detection of partially discharging phase by providing means for switching a connection, which cross bonds the cable sheath at a joint of a power cable from one phase to another phase, from one end to the other end of the cable sheath in same phase. CONSTITUTION:Cable sheaths 1-3 disposed at the joints of a power cable are connected at a plurality of joint boxes(JB) T1-T4. JBJ1, J4 are grounded at a normal. joint NJ connected with sheaths on the opposite sides whereas JBJ2, J3 are insulation jointed IJ where the sheaths on the opposite sides are insulated each other. JBJ2, J3 are provided with link boxes 40 containing switches 41-43. Connections 11, 21, 31 with insulated joint boxes 1A-3A and connections 12, 22, 32 provided with CTs 51-53 and connected with insulated joint boxes 1B-3B are connected with the switches thus switching between the NJ and the IJ. According to the constitution, partially discharged phase can be detected easily and repaired quickly.</p> |
