A circuit breaker hydraulic operating mechanism fault diagnosis method and system based on oil pressure and oil level

Abstract

The present invention provides a fault diagnosis method for a circuit breaker hydraulic operating mechanism based on oil pressure and oil level. The method collects high-pressure cylinder oil pressure YT data of a high-pressure cylinder in real time through an oil pressure sensor, collects low-pressure cylinder oil level LT data of a low-pressure cylinder in real time through an oil level sensor, and collects energy storage motor current C data in real time through a current transformer. The method collects initial data of the mechanism after maintenance, and extracts oil pressure characteristic quantities, oil level characteristic quantities, and current characteristic quantities from the initial data, and uses the oil pressure characteristic quantities, oil level characteristic quantities, and current characteristic quantities as an ideal database. The real-time extracted high-pressure cylinder oil pressure YT data, low-pressure cylinder oil level LT data, and energy storage motor current C data are respectively compared with the ideal database, and the working state of the mechanism is judged using fault judgment logic to output a diagnosis result.

Claims

1. A method for diagnosing faults in a circuit breaker hydraulic operating mechanism based on oil pressure and oil level, characterized by: An oil pressure sensor is placed on the high-pressure cylinder of the hydraulic operating mechanism, an oil level sensor is placed on the low-pressure cylinder, and a current transformer is placed on the power line of the energy storage motor; The oil pressure sensor collects the high-pressure oil pressure Y of the high-pressure oil cylinder in real time T Data, through the oil level sensor to collect the low-pressure cylinder oil level L in real time T Data, real-time collection of energy storage motor current C data through current transformer; Collecting the initial data of the mechanism after maintenance, and extracting the oil pressure characteristic quantity, oil level characteristic quantity and current characteristic quantity from the initial data respectively, and using the oil pressure characteristic quantity, oil level characteristic quantity and current characteristic quantity as an ideal database; The real-time extracted high-pressure cylinder oil pressure Y T Data, low pressure cylinder oil level L T The data and the energy storage motor current C data are respectively compared with the oil pressure characteristic quantity, oil level characteristic quantity and current characteristic quantity in the ideal database, and the fault judgment logic is used to judge the working condition of the mechanism and output the diagnosis result; The extracted oil pressure features include: Pressure relief valve starting pressure Y1, oil pump starting pressure Y2, oil pump stopping pressure Y3, OCO alarm pressure Y4, OCO locking pressure Y5, CO alarm pressure Y6, CO locking pressure Y7, O alarm pressure Y8, O locking pressure Y9; wherein, the oil pressure characteristic quantity is a fixed value after the maintenance is completed; The fault judgment logic includes: Pressure holding performance judgment logic, used to determine whether the pressure holding performance of the hydraulic operating mechanism is normal; Frequent pressure alarm logic is used to determine whether the pressure frequency of the hydraulic operating mechanism is normal; The pressure timeout alarm logic is used to determine whether the pressure timeout of the hydraulic operating mechanism is normal; The pressure alarm logic is used to determine whether the pressure of the hydraulic operating mechanism is normal; The specific process of the pressure holding performance judgment logic is as follows: Set the daily time T to collect the high-pressure cylinder oil pressure Y T , low pressure cylinder oil level L T At T+24 on the second day, the high-pressure cylinder oil pressure Y T+24 , low pressure cylinder oil level L T+24 ; Step 1.1: If Y T -Y T+24 ≥Y 允许 , the output pressure is normal, otherwise proceed to step 1.2; Step 1.2: If L T+24 -L T ≥L 允许 , then output internal leakage, otherwise output external leakage; Where Y 允许 is the preset high pressure cylinder oil pressure deviation value, L 允许 It is the preset low-pressure cylinder oil level deviation value; The specific process of the frequent suppression alarm logic is as follows: Step 2.1: Monitor the real-time high-pressure cylinder oil pressure Y from 0:00 to 24:00 every day T ; Step 2.2: Compare the oil pressure Y of the high-pressure oil cylinder collected in real time T with the set oil pump starting pressure Y2. If Y T < Y2, then A = A + 1; otherwise, A = A Wherein, A is the cumulative number of cycle comparisons of the high-pressure cylinder oil pressure; Step 2.3: When T=24, if A<10, the output suppression times are normal, otherwise the output suppression times are frequent; The specific process of the pressure timeout alarm logic is as follows: Step 3.1: When the high pressure cylinder oil pressure Y T When ≤Y2, record T1; Step 3.2: When T2 = T1 + 120 (s), record Y T2 ; Step 3.3: If Y T2 < is less than Y3, output overpressure during pressure boosting timeout, otherwise output normal pressure boosting; The specific process of the pressure alarm logic is as follows: Step 4.1: Collect the oil pressure Y of the high-pressure cylinder T ; Step 4.2: If Y T >Y2, the output pressure is normal, otherwise proceed to step 4.3; Step 4.3: If Y2 ≥ Y T >Y4, the output pressure is low, otherwise proceed to step 4.4; Step 4.4: If Y4 ≥ Y T >Y6, output OCO alarm, otherwise go to step 4.5; Step 4.5: If Y6 ≥ Y T >Y8, output CO alarm, otherwise output O alarm.

2. A circuit breaker hydraulic operating mechanism fault diagnosis method based on oil pressure and oil level according to claim 1, characterized in that: The extracted oil level features include: Pressure relief valve starting oil level L1, oil pump starting oil level L2, oil pump stopping oil level L3, OCO alarm oil level L4, OCO locking oil level L5, CO alarm oil level L6, CO locking oil level L7, O alarm oil level L8, O locking oil level L9; wherein, the oil level characteristic quantity becomes a fixed value after the inspection is completed.

3. The fault diagnosis method for a circuit breaker hydraulic operating mechanism based on oil pressure and oil level according to claim 1, characterized in that: The extracted current characteristics include: Current peak I max , current start time T1, current stop time T2; wherein, the current characteristic quantity is a fixed value after the maintenance is completed.

4. A circuit breaker hydraulic operating mechanism fault diagnosis system based on oil pressure and oil level, characterized in that: The system is used to implement the fault diagnosis method according to any one of claims 1 to 3, comprising: Data acquisition module, used to collect real-time data of the high-pressure cylinder oil pressure Y of the circuit breaker hydraulic operating mechanism T , low pressure cylinder oil level L T and the motor current C; A feature extraction module is used to extract oil pressure feature, oil level feature and current feature from the hydraulic operating mechanism after maintenance; Fault diagnosis module, used to collect the high pressure oil cylinder oil pressure Y T , low pressure cylinder oil level L T The motor current C is logically judged with the oil pressure characteristic quantity, oil level characteristic quantity and current characteristic quantity extracted in the characteristic quantity extraction module, thereby obtaining the diagnosis result of the hydraulic operating mechanism; The result output module is used to output the diagnosis result obtained by the fault diagnosis module.

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