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Assumption University Thailand EE4503 Electrical Systems Design Protective Devices and Protective Devices Cooordination 1.

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Presentation on theme: "Assumption University Thailand EE4503 Electrical Systems Design Protective Devices and Protective Devices Cooordination 1."— Presentation transcript:

1 Assumption University Thailand EE4503 Electrical Systems Design Protective Devices and Protective Devices Cooordination 1

2 Assumption University Thailand Topics LV protective systems Protective Devices Protective Devices Coordination 2

3 Assumption University Thailand Low Voltage Protective Systems Fully Rated Protective System Selective Protective System Cascade Protective System 3

4 Assumption University Thailand Protective Systems Fully Rated Protective System All devices are able to withstand the maximum short circuit current. (Interrupting Capacity) Highest Cost No need to prioritize the devices 4

5 Assumption University Thailand Protective Systems Fully Rated Protective System 5 Electrical Systems Design: ประสิทธิ์ พิทยพัฒน์

6 Assumption University Thailand Protective Systems Selective Protective System All devices are able to withstand the maximum short circuit current. (Interrupting Capacity) Tripping Characteristic Curve of each devices are “selected” in the way that the device that is closer to the fault trips first. 6

7 Assumption University Thailand Protective Systems Selective Protective System 7 Electrical Systems Design: ประสิทธิ์ พิทยพัฒน์

8 Assumption University Thailand Protective Systems Fully Selective Protective System 8 Electrical Systems Design: ประสิทธิ์ พิทยพัฒน์

9 Assumption University Thailand Protective Systems Partially Selective Protective System 9 Electrical Systems Design: ประสิทธิ์ พิทยพัฒน์

10 Assumption University Thailand Protective Systems Cascade Protective System The upstream device has the faster tripping rate at the high current than the lower one. The upstream device is able to withstand the maximum short circuit current while the downstream is lower capacity. In case of high current short circuit the upstream handle the breaking function. 10

11 Assumption University Thailand Protective Devices Coordination Overlay the plot of tripping curve of each protective devices In general, no crossing of tripping curve –Lower current (downstream devices) branch will be tripped faster. –Higher current (upstream devices) branch will be tripped slower. 11

12 Assumption University Thailand Protective Devices Coordination 12

13 Assumption University Thailand Electrical Systems Design: ประสิทธิ์ พิทยพัฒน์ Device_Coordination.pdf Coordination of LV protection devices: Schneider Electric Reference 13


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