CHAPTER 2: PRODUCT DESCRIPTION SIGNAL PROCESSINGG30 GENERATOR PROTECTION SYSTEM – INSTRUCTION MANUAL 2-1722.4 Signal processing2.4.1 UR signal processingThe UR series relays are microprocessor-based protective relays that are designed to measure power system conditionsdirectly via CT and PT inputs and via other sources of information, such as analog inputs, communications inputs andcontact inputs. The following figure shows the overall signal processing in URs.An analog low pass anti-aliasing filter with a 3 dB corner frequency is set at 2.4 kHz and is used for current and voltageanalog filtering as well as signal conditioning. The same filtering is applied for phase, ground currents, phase-to-phase(when applicable), and auxiliary voltages. The 2.4 kHz cut-off frequency applies to both 50 Hz and 60 Hz applications andfixed in the hardware, and thus is not dependent on the system nominal frequency setting.| 7D | 1300 nm, single-mode, Laser, 1 Channel| 7E | Channel 1 - G.703; Channel 2 - 820 nm, multimode| 7F | Channel 1 - G.703; Channel 2 - 1300 nm, multimode| 7G | Channel 1 - G.703; Channel 2 - 1300 nm, single-mode ELED| 7H | 820 nm, multimode, LED, 2 Channels| 7I | 1300 nm, multimode, LED, 2 Channels| 7J | 1300 nm, single-mode, ELED, 2 Channels| 7K | 1300 nm, single-mode, Laser, 2 Channels| 7L | Channel 1 - RS422; Channel 2 - 820 nm, multimode, LED| 7M | Channel 1 - RS422; Channel 2 - 1300 nm, multimode, LED| 7N | Channel 1 - RS422; Channel 2 - 1300 nm, single-mode, ELED| 7P | Channel 1 - RS422; Channel 2 - 1300 nm, single-mode, Laser| 7Q | Channel 1 - G.703; Channel 2 - 1300 nm, single-mode Laser| 7R | G.703, 1 Channel| 7S | G.703, 2 Channels| 7T | RS422, 1 Channel| 7W | RS422, 2 ChannelsTRANSDUCER INPUTS/OUTPUTS | 5A | 4 DCmA inputs, 4 DCmA outputs (only one 5A module is allowed)| 5C | 8 RTD inputs| 5D | 4 RTD inputs, 4 DCmA outputs (only one 5D module is allowed)| 5E | 4 DCmA inputs, 4 RTD inputs| 5F | 8 DCmA inputsUR - ** - *
