Method for fusing and diagnosing fault information of circuit of electric meter on basis of SOM (self-organized mapping) and D-S (Dempster-Shafer) theories
A technology for circuit faults and diagnostic methods, applied in the direction of measuring electrical variables, measuring devices, instruments, etc., can solve problems such as inability to obtain diagnostic results
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[0153] This paper selects the metering circuit of a certain type of electric energy meter as a case. The selected faulty devices include metal film resistor R1, solid tantalum electrolytic capacitor C1, class 1 ceramic capacitor C2, and ordinary bipolar transistor Q1. A failure mode set is established according to GJB299C, with a total of 14 typical failure modes, as shown in Table 2. The voltage of the output point of the circuit is selected as the signal point to be observed, which is used as the test point of the circuit function and state.
[0154] Table 2 Failure Mode Definitions
[0155] serial number
failure mode
serial number
failure mode
M1
C1-parameter drift +5%
M8
R1 - parameter drift - 5%
M2
Q1-open c-pole
M9
R1-open circuit
M3
Q1-open b pole
M10
C1-parameter drift-5%
M4
Q1-open e pole
M11
C2-parameter drift +5%
M5
Q1- short circuit cb pole ...
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