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Summary of Contents for ABB AKD-8
- Page 1 I N S TA L L AT I O N/O P E R AT I O N I N S T R U C T I O N S [G E L EG AC Y D O C U M E N T ] AKD-8 low-voltage switchgear...
- Page 2 System The following paragraphs describe a high resistance neutral Fault Locating grounding system supplied with GE AKD-8 Low voltage The success of operating a high resistance grounded system Switchgear. The system features an alarm system and utilizes relies heavily on a dependable method of searching out the a pulsing current to locate the first ground fault.
- Page 3 EQUIPMENT DESCRIPTION AND GROUNDING SYSTEM OPERATION (CONT.) To trace the ground fault, the operator turns the selector Taps are provided on the resistor to adjust the magnitude of switch to the "pulse" position. This initiates cycle timing the ground current in the range of 0.9 to 7.3A., depending on alternately energizing and deenergizing a shorting contactor the size of the system, so that the current through the resistor at the secondary resistor, resulting in a rhythmic fluctuation...
- Page 4 GROUNDING SYSTEM OPERATION (CONT.) Grounding Resistors 1 - Press test button to simulate ground and to operate alarm and control circuits. Hold for five seconds or until red Since ground current is limited by the resistors, the last light is lit. section must never be shorted out by the shorting con-tactor during pulsing.
- Page 5 Figure 2 Typical High Resistance Pulsing Ground Detection Elementary...
- Page 6 (Using Accepted Normal Values of System Capacitance Charging Current) High Resistance Pulsing Ground Detector 480 Volt WYE 1. Familiarize yourself with this instruction and with the grounding circuit. 2. Adjust the neutral ground resistance by moving jumpers on resistor terminal board such that the ground current with one ground fault is greater than the System Capacitance Charging Current (I TABLE 5.1...
- Page 7 (Do Not reinstall neutral-ground link, if supplied). The following instruction describes a high resistance neutral ground system supplied with Type AKD-8 7. Energize the variable voltage auto transformer Low Voltage Switchgear. The system features an from an ungrounded, 110V, 60 Hz.
- Page 8 Figure 3. Testing Schematic...
- Page 9 Any reliance placed on such information is therefore strictly at your own risk. ABB reserves the right to For service, call: discontinue any product or service at any time.
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