Eaton GridAdvisor Series II Installation Instructions Manual

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Eaton GridAdvisor Series II Installation Instructions Manual Manual pdf 7 page image

3Installation Instructions MN915001EN June 2016GridAdvisor Series II smart sensorUnderground distribution circuitsPrimary cable preparationProper primary cable preparation is necessary for theGridAdvisor Series II smart sensor acting as a faultedcircuit indicator to work reliably on underground distributioncircuits. The sensor can be used on concentric neutral, tapeshield, or drain wire cable. If the cable does not provide areturn path for the fault current, the sensor can be installeddirectly over the cable. If used on concentric neutral cable,or if the cable shield provides a return path for the faultcurrent, the sensor will not reliably detect a fault and willrequire the use of a tape shield or drain wire adapter. Whenused, the adapter must be installed approximately 3.5”below the elbow to allow space for mounting the sensor onthe cable.One of the following four methods is preferred forinstallation on concentric neutral primary cable:Method 1 (refer to Figure 2A)1. Attach one or two strands of the concentric neutralwrapped around the cable to the tie-off tab on theelbow.2. Terminate all of the remaining neutral wiresapproximately 6” below the elbow.3. Pull the neutral wires straight up and terminate themagain just below the elbow. The wires should then bebent back down the cable (commonly referred to as“double back”).4. Terminate the ground wires approximately 6”below theelbow.ote:N The sensor is installed over the “double back”neutral wires to cancel the effect of current in theneutral. The exact trip value is dependent on theoverall diameter of the “double back” neutral wires.Figure 2.ELBOWTIE-OFFTABELBOWLOCATETHE SENSORPORTION OFTHE FAULTEDCIRCUITINDICATOR(in the outlinedarea)NEUTRALWIRESTERMINATEDNEUTRALWIRESA B C DRecommended methods of concentric neutralprimary cable preparationMethod 2 (refer to Figure 2B)1. Attach one or two strands of the concentric neutralwrapped around the cable to the tie-off tab on the elbow.2. Terminate all of the remaining neutral wires just belowthe elbow. The balance of the neutral wires should begathered together and “double backed” down the cableand grounded.ote:N The sensor is installed over the “double back”neutral wires to cancel the effect of current in theneutral. The exact trip value is dependent on theoverall diameter of the “double back” neutral wires.Method 3 (refer to Figure 2C)1. Attach one or two strands of the concentric neutralwrapped around the cable to the tie-off tab on theelbow.2. Terminate and ground all of the remaining neutral wiresapproximately 6” below the elbow.Method 4 (refer to Figure 2D)1. Arch one or two strands of the concentric neutralwrapped around the cable and attach it to the tie-off tabon the elbow.2. Ensure that the arch is large enough to go around theoutside sensor when the sensor is installed.In some installations, improper preparation of the primarycable will result in an inoperable sensor as a faulted circuitindicator (FCI) (Figure 3). The magnetic field, due to currentin the center conductor, will be cancelled by the current inthe concentric neutral wires.IMPORTANTDo not place the fault indicator as shown in Figure 3. Doingso will prevent the sensor from working properly.Figure 3.A BIncorrect methods of concentric neutralprimary cable preparation