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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Technical Reference: Dual Mode System Controller (DMSC) Neutral-to-Ground Remote Disconnect Application Depending on regional requirements, it may be necessary to configure your DMSC application so that the master microturbine makes a Neutral-to-Ground (N-G) connection when in Stand- Alone mode. This is done to ensure that the supply to the protected loads is properly grounded whenever it is energized, thus preventing any potentially damaging voltages in the protected load during the mode switching operation. This application includes a four-wire disconnect switch that disconnects from the Neutral line as well as from the three phase lines. It also includes a relay to make the N-G connection when the microturbine transitions to Stand-Alone mode Refer to Figure 12 for an interconnection diagram that shows a typical DMSC N-G application. The N-G relay used for this application is a single pole contactor placed near the microturbine. The relay has a Normally Open auxiliary contact, which is connected in series between the Stand-Alone Enable on the DMSC and the Normally Closed auxiliary contact on the remote disconnect device (M1). This lets the DMSC automatically control the ground connection with interlocking to prevent the microturbine from entering Stand Alone mode if the N-G connection is not made. The microturbine(s) will not operate in Stand-Alone mode unless the remote disconnect device (M1) is open and the N-G relay (M2) is closed. After the remote disconnect device (M1) switch closes, there can be a period of approximately 10 ms when the N-G contactor is still closed. This can create a temporary N-G ground loop. However, the duration is not considered to be long enough to cause any nuisance tripping of properly set ground fault isolation devices. During normal conditions, the current passing through the N-G relay is very small. During ground fault conditions, however, the full fault- current rating of the microturbine(s) can flow through the N-G relay until the fault is interrupted. To protect the N-G relay, an Earth Leakage Circuit Breaker (ELCB) should be installed between the microturbine output and the protected load side of the utility lines, as shown in Figure 12. Install the ELCB in the load distribution panel for ground fault detection and isolation on the protected load lines. The ELCB should be a model designed for branch circuit protection for greater sensitivity. If no earth leakage protection is applied to the output of the microturbine(s), the N-G relay must have a continuous current rating that exceeds the maximum output fault current rating of the microturbine(s). The output fault current rating is 145 A for the C65 model and 500 A for the C200 model microturbine. This means that the N-G relay will need a continuous current rating greater than 500 A for applications that include a C200, if no ELCB is installed in the circuit. When an ELCB is installed for earth leakage protection, the N-G relay only needs a short term rating that exceeds the full fault current rating of the microturbine(s). Capstone recommends the GX12TBA relay manufactured by Gigavac (www.gigavac.com), which has a short-term current rating of 2000 A for 0.25 second. This should be adequate for most applications, provided that ground fault protection is applied with a short enough trip time. A typical ground fault trip time is 0.1 second. 410071 Rev D (January 2010) Page 30 of 71 Capstone reserves the right to change or modify, without notice, the design, specifications, and/or contents of this document without incurring any obligation either with respect to equipment previously sold or in the process of construction.PDF Image | Dual Mode System Controller DMSC
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