Impulse Phaser

Other Applications for the Impulse Phaser

After learning to use the Impulse Phaser, you will no doubt find various other applications for the instrument. Some worth mentioning are:

1. Finding a fault in a single phase cable circuit. After the cable has been removed from service and tagged as being out of service, remove any grounds from the cable ends. Attach the "RED" lead of the Impulse Phaser to the conductor. Attach the "YELLOW" lead to ground. Turn the Impulse Phaser on. If the amber light begins to blink, this indicates that the cable is grounded. Place the clamp-on over the cable beginning just beyond where the Impulse Phaser is installed. You should obtain an "A" or "RED" indication. Continue towards the opposite end of the cable circuit until no signal is obtained. You have just passed the fault.

If the Impulse Phaser does not begin to pulse, this indicates that the fault is a high resistance fault and will require a high voltage thumper to locate.

Note: If the circuit is three-phase and no impulsing is obtained from each phase to ground, try going between phases to see if there is a phase to phase short. If a signal is obtained, look for the fault. If no signal is obtained, call out the thumper.

2. Identify an underwater submarine cable in 300' of water. This application required that we provide a clamp-on with a 325' cable lead so that a diver could take the clamp-on underwater while an engineer kept the detector aboard ship.

3. Identify a shorted street light cable. Open the cable at the first lamp. Connect the "RED" lead to the cable conductor. Connect the "YELLOW" lead to ground. Turn the Impulse Phaser transmitter on. If the transmitter begins to operate, go to the next lamp. First place the clamp-on over the incoming cable and then over the outgoing cables. If a signal is obtained on both cables, go to the next lamp. If a signal is obtained on the incoming cable but not on the outgoing cable, the problem is up in the lamp. If no signal is obtained on either cable at this lamp, the fault is between this lamp and the previous lamp where the signal was obtained.

4. Identifying the fault location of a high voltage cable using the Impulse Phaser detector when thumping with a high voltage d.c. source (thumper). Go to the first manhole or location beyond the point where the "thumper" is attached to the cable. Lay the clamp-on on the cable with the identified side facing the cable and the clamp-on cable lead pointing toward the "thumper". Adjust the sensitivity until you obtain about a half scale deflection. Continue to search the cable route until the signal disappears. You have just passed the fault. This scheme was used by a major power company to identify the location of a high voltage submarine cable fault

Timco Instrumrnt's Safe Identification of Power Cables

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