IEEE C37.10.1-2018 pdf free download – IEEE Guide for the Selection of Monitoring for Circuit Breakers.
6.2 Control circuits
The following control circuit components and operating conditions should be acssible for efective monitoring:
a)Trip circuit integrity using established methods: Detect open trip circuit and rising circuit resistance.
b) Close circuit integrity using established methods: Detect close trip circuit and rising circuit resistance.
c) DC control voltage: Voltage level, Detect abnormal control voltage.
d) AC control voltage: Voltage level, Detect abnormal control voltage.
6.3 Operating mechanism
The following operating mechanism components and operating conditions should be accessible for efctive monitoring:
a)Mechanical quality- opening time: Detect mechanical and lubrication concerns
b) Mechanical quality- closing time: Dctect mechanical and lubrication concerms
c) Mechanical quality – travel time: Detect mechanical and lubrication concerms
d) Mechanical quality- stored energy: Detect loss or reduction in stored energy
e) Mechanical quality- recharge time: Detect change in time of recharging
f)Mechanical quality- total number of operations: Detect mechanical wear and system degradation
g) Spring charging motor duration
h) Hydraulic pump motor current, pump duration, frequency of pump starts
i) Air compressor motor curent, motor duration, frequency of motor starts
6.4 Accessories
The following accessory components and operating conditions should be acessible for effective monitoring;
a) Control/mechanism cabinet heater operation: Detect loss of heater operation
b) SF6 tank heater operation: Detect loss of heater operation, monitor heater resistance and current
c) Cabinet door status, open/close time stamping
7. Methodology
7.1 General Several methodologies are intoduced to assist a user with arriving at a monitoring selection based on the greatest reduction in failure rate, considering the risks of such failure and the cost benefit value available by the application of monitoring. A methodology termed FMEA is presented to assist identification of significant failure modes and their causes. The concepts of risk assessment are then introduced. The subsequently derived priority and economic analysis then determincs when and where monitoring is warranted.
7.2 Decision-making sequence The decision-making process for monitoring selection described in this guide is as follows: Stage 1:
a) Undertake an FMEA to identify failure modes, causes of the failure modes, and causes of failure characteristics for the specifc family of circuit breakers.
b) The FMEA identifes monitoring options that are available and appropriate to observe the condition of circuit breakers. This stage is described in the succeeding section and given in Table 2 through Table 19. The process for Stage 1(a) and Stage 1(b) would be to identify those elements in Table 2 through Table 19 that are important for the circuit breaker group in the analysis. A column is provided for adding the score from Stage 2(a) to Table 2 through Table 19.IEEE C37.10.1 pdf download.