SE-145 MANUAL GROUND-FAULT GROUND-CHECK MONITOR
The SE-145 is a three-channel microprocessor-based, combination ground-fault and ground-check monitor for resistance-grounded systems. It has a switching power supply that accepts a wide range of ac and dc voltages, and specifications apply over an industrial temperature range at high humidity. The operating conditions of each channel are indicated by LED’s and two Form C contacts are provided for remote indication of ground-fault and ground-check status. Isolated, normally open and normally closed contacts are provided for contactor control or for shunt or undervoltage operation in a breaker-trip circuit. The SE-145 is housed in an anodized extruded-aluminum enclosure, and all connections are made with plug-in, wire-clamping terminal blocks.
The ground-fault circuits detect fundamental-frequency, zero-sequence current with a window-type current sensor and verify that the current sensor is connected and not shorted. A definite-time characteristic with 11 trip levels and 11 trip times allows coordination in virtually any resistance-grounded system. Although other current sensors may satisfy the verification circuit, only SE-CS10 or SE-CS40 current sensors have characteristics that meet system specifications. Current-sensor verification can be disabled in a ground-check-only application.
The ground-check circuits have an open-circuit voltage of 30 Vdc so it is not a hazard to personnel, and have an output drive current above 100 mA for optimum performance in slip-ring, commutated-load, and high-induced-ac applications.
Each of the three ground-check circuits feature an externally accessible ground-check fuse, 3-kV ground-check loop isolation, and optional network communications circuits.
Unlike ground-check circuits using other termination devices, and especially those with phase-reversal switches, a ground-check circuit using a termination device with a Zener characteristic is capable of loop measurements that are independent of current in the phase conductors. The SE-145 ground-check circuits recognize the SE-TA12A 12-volt Zener characteristic as a valid end-of-line completion. This is the only passive characteristic that will satisfy the ground-check circuit’s multi-level drive, allow induced currents to circulate in the ground-check loop, survive a phase-to-ground-check fault, and clamp the ground-check voltage during the fault. Although a standard 12-volt Zener diode may engage the SE-145’s ground-check circuit, only an SE-TA12A has the accuracy and temperature compensation required to meet system specifications.
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SE-145 、 SE-CS10-2.5 、 SE-CS10-4 、 SE-CS10-6 、 SE-CS40-6 、 SE-CS10-8 |
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User's Guide |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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August 21, 2009 |
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S95-C145-00000 |
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624 KB |
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