* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download Trip Circuit Supervision for M
Wien bridge oscillator wikipedia , lookup
Resistive opto-isolator wikipedia , lookup
Surge protector wikipedia , lookup
Digital electronics wikipedia , lookup
Crystal radio wikipedia , lookup
Immunity-aware programming wikipedia , lookup
Transistor–transistor logic wikipedia , lookup
Flexible electronics wikipedia , lookup
Switched-mode power supply wikipedia , lookup
Charlieplexing wikipedia , lookup
Zobel network wikipedia , lookup
Operational amplifier wikipedia , lookup
Schmitt trigger wikipedia , lookup
Integrated circuit wikipedia , lookup
Valve RF amplifier wikipedia , lookup
Index of electronics articles wikipedia , lookup
Two-port network wikipedia , lookup
Regenerative circuit wikipedia , lookup
Opto-isolator wikipedia , lookup
g GE Multilin Technical Notes Trip Circuit Supervision for M-Family Relays GE Publication No.: GET-8465 Copyright © 2003 GE Multilin DESCRIPTION The GE Multilin M-Family of relays can be used to monitor trip circuit integrity (the MIF relay must be ordered as Option 2 to include input/output and logic configurability). The supervision circuit is essentially a Voltage Monitor connected to contact 52a that continuously monitors the voltage level. The circuit shown in the following figures is designed to monitor the complete trip circuit. It includes the tripping coil of the breaker and the trip circuit, the wiring between the relays, and the circuit breaker. An alarm can be issued when the circuit is open. The figure below shows the typical wiring that provides trip circuit monitoring while the circuit breaker is closed. +V DC A5 A6 Trip Circuit Breaker Auxiliary Contact (52a) TRIP A8 Input #1 A9 Input #2 A10 COM M-Series Relay Trip Coil FIGURE 1. Trip Circuit Monitoring for a Closed Breaker 1 GET-8465: Trip Circuit Supervision for M-Family Relays For continuous monitoring of the trip circuit (this is, while the breaker is open as well as closed), a by-pass resistor must be added in parallel to the 52a contact as shown below. This technique maintains current flow through the circuit when the breaker is open. +V DC A5 Trip Circuit By-Pass Resistor R A6 Breaker Auxiliary Contact (52a) TRIP A8 Input #1 A9 Input #2 A10 COM M-Series Relay Trip Coil Value of resistor R Supply Ohms Watts 48 Vdc 10 K 2 125 Vdc 25 K 5 250 Vdc 50 K 5 FIGURE 2. Continuous Trip Circuit Monitoring using a By-Pass Resistor SETTINGS AND CONFIGURATION The M+PC settings and configuration related to this function are described in the following procedure: 1. Under I/O Configuration, the Input #1 setting must be configured as “General Input”. It will be used to monitor the permanent presence of voltage. 2 GE Multilin GET-8465: Trip Circuit Supervision for M-Family Relays 2. Under Logic Configuration, select Logic 1 then Invert Input #1 and set the timer to the required time delay to produce the Trip Circuit Supervision Alarm (for example 15 seconds). 3. Configure LEDs and outputs as required in the I/O Configuration window. In this example, LED 1 and Configurable Output 1 are configured to operate when a Trip Circuit failure is detected. They are also configured to have memory, so they will remain active even if the Trip Circuit failure disappears. GE Multilin 3