CHAPTER 5: SETTINGS INPUTS/OUTPUTSB90 LOW IMPEDANCE BUS DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL 5-18155.8.6.3 Application examplesThe examples introduced in the earlier Direct Inputs and Outputs section (part of the Product Setup section) are continuedhere to illustrate usage of the direct inputs and outputs.Example 1: Extending input/output capabilities of a UR relayConsider an application that requires additional quantities of contact inputs or output contacts or lines of programmablelogic that exceed the capabilities of a single UR-series chassis. The problem is solved by adding an extra UR-series IED,such as the C30, to satisfy the additional inputs/outputs and programmable logic requirements. The figure shows that twoIEDs are connected via single-channel digital communication cards.Figure 5-99: Input and output extension via direct inputs and outputsAssume that contact input 1 from UR IED 2 is to be used by UR IED 1. The following settings are applied (Direct Input 5 andbit number 12 are used, as an example).UR IED 1:DIRECT INPUT 5 DEVICE ID = “2”DIRECT INPUT 5 BIT NUMBER = “12”UR IED 2:DIRECT OUT 12 OPERAND = “Cont Ip 1 On”The Cont Ip 1 On operand of UR IED 2 is now available in UR IED 1 as DIRECT INPUT 5 ON.Example 2: Interlocking busbar protectionA simple interlocking busbar protection scheme can be accomplished by sending a blocking signal from downstreamdevices, say 2, 3 and 4, to the upstream device that monitors a single incomer of the busbar, as shown in the figure.Figure 5-100: Sample interlocking busbar protection schemeAssume that Phase Instantaneous Overcurrent 1 is used by Devices 2, 3, and 4 to block Device 1. If not blocked, Device 1trips the bus upon detecting a fault and applying a short coordination time delay.The following settings are applied (assume Bit 3 is used by all 3 devices to send the blocking signal and Direct Inputs 7, 8,and 9 are used by the receiving device to monitor the three blocking signals).UR IED 2:
