GE L90 Instruction Manual

Also see for L90: Communications manual Communications guide Instruction manual Instruction manual Instruction manual

Contents

GE Multilin L90 Line Differential Relay 3-113 HARDWARE 3.2 WIRING3The operation of voltage and current monitors is reflected with the corresponding FlexLogicô operands ( Cont Op # Von , ContOp # Voff , Cont Op # Ion , and Cont Op # Ioff ) which can be used in protection, control and alarm logic. The typical application ofthe voltage monitor is breaker trip circuit integrity monitoring; a typical application of the current monitor is seal-in of thecontrol command. Refer to the Digital Elements section of Chapter 5 for an example of how Form-A/SSR contacts can beapplied for breaker trip circuit integrity monitoring.Relay contacts must be considered unsafe to touch when the unit is energized! If the relay contacts need tobe used for low voltage accessible applications, it is the customerís responsibility to ensure proper insula-tion levels!USE OF FORM-A/SSR OUTPUTS IN HIGH IMPEDANCE CIRCUITSFor Form-A/SSR output contacts internally equipped with a voltage measuring cIrcuit across the contact, the circuithas an impedance that can cause a problem when used in conjunction with external high input impedance monitor-ing equipment such as modern relay test set trigger circuits. These monitoring circuits may continue to read theForm-A contact as being closed after it has closed and subsequently opened, when measured as an impedance.The solution to this problem is to use the voltage measuring trigger input of the relay test set, and connect theForm-A contact through a voltage-dropping resistor to a DC voltage source. If the 48 V DC output of the power sup-ply is used as a source, a 500 Ω, 10 W resistor is appropriate. In this configuration, the voltage across either theForm-A contact or the resistor can be used to monitor the state of the output.Wherever a tilde ì~î symbol appears, substitute with the Slot Position of the module; wherever a numbersign "#" appears, substitute the contact numberWhen current monitoring is used to seal-in the Form-A/SSR contact outputs, the FlexLogicô operand driv-ing the contact output should be given a reset delay of 10 ms to prevent damage of the output contact (insituations when the element initiating the contact output is bouncing, at values in the region of the pickupvalue).Table 3ñ2: DIGITAL INPUT/OUTPUT MODULE ASSIGNMENTS~6A I/O MODULE ~6B I/O MODULE ~6C I/O MODULE ~6D I/O MODULETERMINALASSIGNMENT OUTPUT ORINPUT TERMINALASSIGNMENT OUTPUT ORINPUT TERMINALASSIGNMENT OUTPUT TERMINALASSIGNMENT OUTPUT~1 Form-A ~1 Form-A ~1 Form-C ~1a, ~1c 2 Inputs~2 Form-A ~2 Form-A ~2 Form-C ~2a, ~2c 2 Inputs~3 Form-C ~3 Form-C ~3 Form-C ~3a, ~3c 2 Inputs~4 Form-C ~4 Form-C ~4 Form-C ~4a, ~4c 2 Inputs~5a, ~5c 2 Inputs ~5 Form-C ~5 Form-C ~5a, ~5c 2 Inputs~6a, ~6c 2 Inputs ~6 Form-C ~6 Form-C ~6a, ~6c 2 Inputs~7a, ~7c 2 Inputs ~7a, ~7c 2 Inputs ~7 Form-C ~7a, ~7c 2 Inputs~8a, ~8c 2 Inputs ~8a, ~8c 2 Inputs ~8 Form-C ~8a, ~8c 2 Inputs~6E I/O MODULE ~6F I/O MODULE ~6G I/O MODULE ~6H I/O MODULETERMINALASSIGNMENT OUTPUT ORINPUT TERMINALASSIGNMENT OUTPUT TERMINALASSIGNMENT OUTPUT ORINPUT TERMINALASSIGNMENT OUTPUT ORINPUT~1 Form-C ~1 Fast Form-C ~1 Form-A ~1 Form-A~2 Form-C ~2 Fast Form-C ~2 Form-A ~2 Form-A~3 Form-C ~3 Fast Form-C ~3 Form-A ~3 Form-A~4 Form-C ~4 Fast Form-C ~4 Form-A ~4 Form-A~5a, ~5c 2 Inputs ~5 Fast Form-C ~5a, ~5c 2 Inputs ~5 Form-A~6a, ~6c 2 Inputs ~6 Fast Form-C ~6a, ~6c 2 Inputs ~6 Form-A~7a, ~7c 2 Inputs ~7 Fast Form-C ~7a, ~7c 2 Inputs ~7a, ~7c 2 Inputs~8a, ~8c 2 Inputs ~8 Fast Form-C ~8a, ~8c 2 Inputs ~8a, ~8c 2 InputsWARNINGNOTENOTENOTE