CN105548939A - Voltage transformer state detection method - Google Patents

Abstract

The invention discloses a voltage transformer state detection method and aims to realize high efficiency and comprehensive and accurate detection result. The method comprises steps that basic information data and the onsite operation data of the voltage transformer are acquired, the acquired data is classified, an operation state value GP of the voltage transformer is further calculated, according to the corresponding relationship between a preset voltage transformer operation state value and an operation state, the actual operation state corresponding to the actual state value of the voltage transformer is determined. According to the method, efficiency is high, faults of the normally-operated equipment caused by artificial factors can be avoided, the basic information data, the detection date, the monitoring data and the family defect data of the voltage transformer are taken into comprehensive consideration by the detection method, comprehensive detection on the state of the voltage transformer can be realized, the detection result is guaranteed to be accurate, comprehensive and with high efficiency, and the method is suitable for popularization and application in the gateway metering equipment state evaluation technology field.

Description

voltage transformer state inspection method

Technical Field

The invention relates to the technical field of state evaluation of gateway metering equipment, in particular to a state inspection method for a voltage transformer.

Background

In order to ensure the normal operation of the voltage transformer and the reliability of the metering data of the voltage transformer, the operation state of the voltage transformer needs to be estimated remotely, most of the existing voltage transformer state inspection methods adopt a manual inspection mode, the manual inspection mode needs a large amount of manual work to carry out field inspection and a complex calculation process, and the working efficiency is low; secondly, when the electric energy meter is manually tested on site precision, the voltage transformer needs to be operated repeatedly, and equipment which normally runs originally is prone to failure after multiple times, so that a large potential fault hazard exists; furthermore, the existing manual inspection method for the voltage transformer only attaches importance to the detection of the accuracy and the wiring correctness of the voltage transformer, cannot realize the comprehensive inspection of the state of the voltage transformer, leads to the inaccuracy of the finally obtained inspection result, is easy to make mistakes in manual intervention, leads to the low reliability of the inspection result, cannot accurately master the dynamic safety and stability of the voltage transformer, further cannot ensure the safe, stable and accurate operation of each main voltage transformer, lacks the dynamic tracking and analysis of accident handling information, and cannot dynamically control serious faults.

Disclosure of Invention

The invention aims to provide a voltage transformer state detection method which is high in efficiency and comprehensive and accurate in detection result.

The technical scheme adopted by the invention for solving the technical problems is as follows: the method for checking the state of the voltage transformer comprises the following steps:

A. collecting basic information data and field operation data of the voltage transformer;

B. classifying the data, and classifying the data into the following four classes: the method comprises the following steps of (1) voltage transformer basic information data, voltage transformer detection data, voltage transformer monitoring data and voltage transformer family defect data;

C. calculating the running state value G of the voltage transformer according to the basic information data, the detection data, the monitoring data and the family defect data of the voltage transformer_PAnd determining the actual operation state corresponding to the actual state value of the voltage transformer according to the preset corresponding relation between the state value and the operation state of the voltage transformer.

Further, the voltage transformer operation state value G_PThe following formula is adopted to calculate the formula, $G_P=B_P\×\sqrt[3]{T_P\×M_P\×F_P};$

B_P＝B_P1+B_P6+B_P3+B_P5+B_P4；

P_1-1A、P_1-2A、P_1-3Athe ratio differences, P, of 3 load points are respectively selected for laboratory testing of the voltage transformers_1-1B、P_1-2B、P_1-3BPhase differences of 3 load points are selected for laboratory verification of the voltage transformer respectively;

B_P6＝20-P₆，P₆the number of operating years of the voltage transformer;

P_3Avoltage transformer in U for qualified in the same batch_n、I_nThe standard deviation of the fundamental ratio difference when cosj is 1,P_3Bvoltage transformer in U for qualified in the same batch_n、I_nThe standard deviation of the basic phase difference when cosj is 1,

B_P5＝20×(1-P₅)，P₅for the same batch of voltage transformers to operate at fault rate, P₅Quitting the number of the operating voltage transformers/the total number of the voltage transformers in a batch due to the quality problem;

B_P4＝10×(1-P₄)，P₄the unqualified returned batch rate of the voltage transformers of the same manufacturer is as follows: p₄The returned batch number of unqualified voltage transformers/the total batch number of supplied voltage transformers;

$T_P=\frac{3T_{P2}}{10}+\frac{3T_{P8}}{10}+\frac{3T_{P9}}{10}+\frac{T_{P10}}{10};$

wherein,P_2-iAratio difference, P, for field real load testing of voltage transformers_2-iBPhase difference for field real load inspection of voltage transformer, when T_P2i<At 0, T_P2i＝0，i＝1,2,3；

When T is_P8<At 0, T_P8＝0，P₈Monitoring a ratio difference for the voltage transformer on line;

when T is_P9<At 0, T_P9＝0，P₉Monitoring the phase difference for the voltage transformer on line;

P_10Afor online monitoring of standard deviation, P, of ratio difference of voltage transformer_10BMonitoring the standard deviation of the phase difference for the voltage transformer on line, when P_10A<0.2 × limit and P_10B<Limit of 0.2 ×, T_P101 is ═ 1; if not, then,when T is_P10<At 0, T_P10＝0；

$M_P=\sqrt[5]{M_{P11}\&times;M_{P12}\&times;M_{P13}\&times;M_{P14}\&times;M_{P15}};$

P₁₁The number of overvoltage abnormal events of the voltage transformer is shown;

P₁₂the number of overcurrent abnormal events of the voltage transformer is shown;

P₁₃the number of the abnormal events of the external electric field of the voltage transformer is shown;

P₁₄the number of the abnormal events of the primary conductor magnetic field of the voltage transformer is counted;

P₁₅the number of the abnormal events of the frequency of the voltage transformer is shown;

wherein N is the total number of the family voltage transformers; n (1. ltoreq. N. ltoreq.N) is the number of voltage transformers in which the family defect occurs, P₇And obtaining values of the defects of the voltage transformer family.

The invention has the beneficial effects that: the method for checking the state of the voltage transformer classifies the collected data and calculates the operation state value G of the voltage transformer by collecting the basic information data and the field operation data of the voltage transformer_PThe actual operation state corresponding to the actual state value of the voltage transformer is determined according to the preset corresponding relation between the state value and the operation state of the voltage transformer, the operation state of the voltage transformer is obtained through data analysis, manual field inspection is not needed, and the efficiency is high; secondly, manual intervention is reduced, the failure of the original normally-operated equipment caused by human reasons can not occur, and the hidden danger of equipment failure is low; in addition, the inspection method comprehensively considers the basic information data, the detection data, the monitoring data and the family defect data of the voltage transformer, can realize the comprehensive inspection of the state of the voltage transformer, and ensures that the finally obtained inspection result is accurate,The voltage transformer fault detection system is comprehensive and high in reliability, can accurately master the dynamic safety stability of the voltage transformers, further ensures that each main voltage transformer can safely, stably and accurately operate, and can dynamically track and analyze accident handling information, thereby dynamically controlling serious faults.

Detailed Description

The state inspection method of the voltage transformer comprises the following steps:

A. collecting basic information data and field operation data of the voltage transformer; basic information data of the voltage transformer can be obtained through an existing metering production dispatching platform (MDS), the metering production dispatching platform (MDS) collects all link verification error data of the voltage transformer such as full performance before supply, sample comparison after arrival, sampling inspection, full inspection and the like, and all supplier bid batch, arrival batch, return batch information and fault conditions of operation links, and when the basic information data of the voltage transformer is collected, only relevant data stored by the metering production dispatching platform need to be called; the on-site operation data of the voltage transformer can be acquired by the existing power utilization information acquisition system, and the power utilization information acquisition system can realize the acquisition and monitoring of various data such as the operation condition, event record and the like of the voltage transformer, wherein the on-line monitoring and intelligent diagnosis module can diagnose and analyze the operation condition of the voltage transformer by comparing and analyzing the acquired data and events and mining the data, so as to find abnormal conditions such as load in time, and only the related data acquired by the power utilization information acquisition system is needed to be called when the on-site operation data of the voltage transformer is collected;

B. classifying the data, and classifying the data into the following four classes: the method comprises the following steps of (1) voltage transformer basic information data, voltage transformer detection data, voltage transformer monitoring data and voltage transformer family defect data;

C. according to the basic information data of the voltage transformer, the detection data of the voltage transformer, the monitoring data of the voltage transformer and the voltageCalculating running state value G of voltage transformer by using defect data of transformer family_PAnd determining the actual operation state corresponding to the actual state value of the voltage transformer according to the preset corresponding relation between the state value and the operation state of the voltage transformer.

The method for checking the state of the voltage transformer classifies the collected data and calculates the operation state value G of the voltage transformer by collecting the basic information data and the field operation data of the voltage transformer_PThe actual operation state corresponding to the actual state value of the voltage transformer is determined according to the preset corresponding relation between the state value and the operation state of the voltage transformer, the operation state of the voltage transformer is obtained through data analysis, manual field inspection is not needed, and the efficiency is high; secondly, manual intervention is reduced, the failure of the original normally-operated equipment caused by human reasons can not occur, and the hidden danger of equipment failure is low; in addition, the inspection method comprehensively considers basic information data, detection data, monitoring data and family defect data of the voltage transformers, can realize comprehensive inspection of the states of the voltage transformers, ensures that the finally obtained inspection result is accurate, comprehensive and high in reliability, can accurately master the dynamic safety and stability of the voltage transformers, further ensures that each main voltage transformer can safely, stably and accurately operate, and can dynamically track and analyze accident handling information, thereby dynamically controlling serious faults.

In the above embodiment, the voltage transformer operating state value G_PThe following formula is adopted to calculate the formula, $G_P=B_P\&times;\sqrt[3]{T_P\&times;M_P\&times;F_P};$

B_P＝B_P1+B_P6+B_P3+B_P5+B_P4，B_Pthe method comprises the following steps that a basic state value of the voltage transformer is used, and the state value reflects the performance of the voltage transformer equipment;

P_1-1A、P_1-2A、P_1-3Athe ratio differences, P, of 3 load points are respectively selected for laboratory testing of the voltage transformers_1-1B、P_1-2B、P_1-3BPhase differences of 3 load points are selected for laboratory verification of the voltage transformer respectively; the state quantities can reflect the inherent metering performance of the voltage transformer; the 3 load points can be selected according to actual needs, and in general, P is_1-1A0.8Un, In,Difference of ratio of (A) to (B), P_1-1B0.8Un, In,Phase difference of (D), P_1-2AIs 1Un, In,Difference in time ratio, P_1-2BIs 1Un, In,Phase difference of time, P_1-3A1.2Un, In,Difference in time ratio, P_1-3B1.2Un, In,The time phase difference, the limit value is the error limit value corresponding to the active voltage transformer with the accuracy grade of 0.2S, and the value is 0.2;

B_P6＝20-P₆，P₆the minimum resolution is 0.5 year for the number of operation years of the voltage transformer, and a rule of only leaving no entry is adopted, for example, 0 year is 0-5.9 months, and 0.5 year is 6-11.9 months, and the state quantity reflects the influence of the operation time on the fault rate of the voltage transformer;

P_3Avoltage transformer in U for qualified in the same batch_n、I_nThe standard deviation of the fundamental ratio difference when cosj is 1,P_3Bvoltage transformer in U for qualified in the same batch_n、I_nThe standard deviation of the basic phase difference when cosj is 1,the state quantity reflects the quality control of the voltage transformers in batches, and the limit value is an error limit value corresponding to the active voltage transformer with the accuracy grade of 0.2S and is 0.2;

B_P5＝20×(1-P₅)，P₅for the same batch of voltage transformers to operate at fault rate, P₅The quantity of the operating voltage transformers/the total quantity of the voltage transformers in a batch is withdrawn due to quality problems, and the state quantity reflects the quality of the batch of the operating voltage transformers;

B_P4＝10×(1-P₄)，P₄the unqualified returned batch rate of the voltage transformers of the same manufacturer is as follows: p₄The return batch number/total supplied batch number of the voltage transformers which are unqualified, and the state quantity reflects the manufacture of the voltage transformersManufacturer reputation, management and quality levels;

$T_P=\frac{3T_{P2}}{10}+\frac{3T_{P8}}{10}+\frac{3T_{P9}}{10}+\frac{T_{P10}}{10};$

wherein,P_2-iAratio difference, P, for field real load testing of voltage transformers_2-iBPhase difference for field real load inspection of voltage transformer, when T_P2i<At 0, T_P2i0, i-1, 2, 3; normally, the period is detected to be 0.8U_n、I_n、1.2I_nRatio difference P of 3 load points in total_2-iANormally, the period is detected to be 0.8U_n、I_n、1.2I_nPhase difference P of 3 load points in total_2-iBThe limit value is an error limit value corresponding to the active voltage transformer with the accuracy grade of 0.2S, and the value is 0.2;

when T is_P8<At 0, T_P8＝0，P₈Monitoring a ratio difference for the voltage transformer on line; the state quantity reflects the real-time error condition of the voltage transformer, and the ratio difference of the voltage transformer can be estimated on line according to secondary load monitoring data, wherein the limit value is an error limit value corresponding to an active voltage transformer with the accuracy grade of 0.2S, and the value is 0.2;

when T is_P9<At 0, T_P9＝0，P₉Monitoring the phase difference for the voltage transformer on line; the state quantity reflects the real-time error condition of the voltage transformer, the phase difference of the voltage transformer can be estimated on line according to secondary load monitoring data, and the limit value is an error limit value corresponding to an active voltage transformer with the accuracy grade of 0.2S and is taken as 0.2;

P_10Afor online monitoring of standard deviation, P, of ratio difference of voltage transformer_10BMonitoring the standard deviation of the phase difference for the voltage transformer on line, when P_10A<0.2 × limit and P_10B<Limit of 0.2 ×, T_P101 is ═ 1; if not, then,when T is_P10<At 0, T_P10The limit value is 0, the limit value is an error limit value corresponding to the active voltage transformer with the accuracy grade of 0.2S, and the value is 0.2;

M_Pthe state value is a state value of abnormal operation of the voltage transformer, and the state value reflects whether the voltage transformer operates abnormally or not;

P₁₁the number of overvoltage abnormal events of the voltage transformer is the number of events of overvoltage invading the voltage transformer, which are generated by lightning stroke, system short circuit, grounding and the like and are monitored and found on line during the calculation of the running state values of the voltage transformer twice;

P₁₂the number of the voltage transformer overcurrent abnormal events refers to the number of the events that overcurrent generated by lightning stroke, system short circuit, grounding and the like invades the voltage transformer, which are detected by online monitoring during the calculation of the running state values of the voltage transformer twice;

P₁₃the number of the abnormal events of the external electric field of the voltage transformer is the number of the abnormal events of the external electric field of the voltage transformer, which are detected by online monitoring during the two times of calculation of the running state value of the voltage transformer;

P₁₄the number of the abnormal events of the primary conductor magnetic field of the voltage transformer is the number of the abnormal events of the primary conductor magnetic field of the voltage transformer, which are detected by online monitoring during the calculation of the running state values of the voltage transformer twice;

P₁₅the number of the abnormal events of the frequency of the voltage transformer is the number of the abnormal events of the frequency of the voltage transformer, wherein the number of the abnormal events of the frequency of the voltage transformer is the number of the abnormal events of the frequency of the voltage transformer which are detected by online monitoring during the two times of calculation of the running state value of the voltage transformer;

wherein N is the total number of the family voltage transformers; n (1. ltoreq. N. ltoreq.N) is the number of voltage transformers in which the family defect occurs, P₇Evaluating the voltage transformer family defect, namely the voltage transformer family defect P₇The values are shown in the following table:

defect of	Family Defect P7Value taking
		Has no great influence on the metering performance of the voltage transformer and has small sudden deterioration risk	86％～100％
Has certain influence on the metering performance of the voltage transformer and can monitor	51％～85％
		Has certain influence on the metering performance of the voltage transformer and can not be monitored	16％～50％
The metering performance of the voltage transformer is influenced.	0～15％

The voltage transformer running state value G calculated by the method_PAccurate, comprehensive and high in reliability, can accurately master the dynamic safety and stability of the voltage transformer, further ensures the safe, stable and accurate operation of the voltage transformer, and can mutually control the voltageAnd dynamically tracking and analyzing the accident handling information of the sensor, thereby dynamically controlling the serious faults of the voltage transformer.

The corresponding relation between the state value of the voltage transformer and the operation state is shown in the following table:

。

Claims (2)

1. A method for checking the state of a voltage transformer is characterized by comprising the following steps:

A. collecting basic information data and field operation data of the voltage transformer;

B. classifying the data, and classifying the data into the following four classes: the method comprises the following steps of (1) voltage transformer basic information data, voltage transformer detection data, voltage transformer monitoring data and voltage transformer family defect data;

C. according to the basic information data of the voltage transformer, the detection data of the voltage transformer and the monitoring data of the voltage transformerCalculating the running state value G of the voltage transformer according to the defect data of the voltage transformer family_PAnd determining the actual operation state corresponding to the actual state value of the voltage transformer according to the preset corresponding relation between the state value and the operation state of the voltage transformer.

2. The voltage transformer state checking method of claim 1, wherein: the running state value G of the voltage transformer_PThe following formula is adopted to calculate the formula,

B_P＝B_P1+B_P6+B_P3+B_P5+B_P4；

P_1-1A、P_1-2A、P_1-3Athe ratio differences, P, of 3 load points are respectively selected for laboratory testing of the voltage transformers_1-1B、P_1-2B、P_1-3BPhase differences of 3 load points are selected for laboratory verification of the voltage transformer respectively;

B_P6＝20-P₆，P₆the number of operating years of the voltage transformer;

P_3Avoltage transformer in U for qualified in the same batch_n、I_nThe standard deviation of the fundamental ratio difference when cosj is 1,P_3Bvoltage transformer in U for qualified in the same batch_n、I_nThe standard deviation of the basic phase difference when cosj is 1,

B_P5＝20×(1-P₅)，P₅for the same batch of voltage transformers to operate at fault rate, P₅Quitting the number of the operating voltage transformers/the total number of the voltage transformers in a batch due to the quality problem;

B_P4＝10×(1-P₄)，P₄the unqualified returned batch rate of the voltage transformers of the same manufacturer is as follows: p₄The returned batch number of unqualified voltage transformers/the total batch number of supplied voltage transformers;

$T_P=\frac{3T_{P2}}{10}+\frac{3T_{P8}}{10}+\frac{3T_{P9}}{10}+\frac{T_{P10}}{10};$

wherein, $T_{P2}=\frac{{\&Sigma;}_{i=1}^3{T}_{P2i}}{3},$ P_2-iAratio difference, P, for field real load testing of voltage transformers_2-iBPhase difference for field real load inspection of voltage transformer, when T_P2i<At 0, T_P2i＝0，i＝1,2,3；

When T is_P8<At 0, T_P8＝0，P₈Monitoring a ratio difference for the voltage transformer on line;

when T is_P9<At 0, T_P9＝0，P₉Monitoring the phase difference for the voltage transformer on line;

P_10Afor online monitoring of standard deviation, P, of ratio difference of voltage transformer_10BMonitoring the standard deviation of the phase difference for the voltage transformer on line, when P_10A<0.2 × limit and P_10B<Limit of 0.2 ×, T_P101 is ═ 1; if not, then,when T is_P10<At 0, T_P10＝0；

$M_P=\sqrt[5]{M_{P11}\&times;M_{P12}\&times;M_{P13}\&times;M_{P14}\&times;M_{P15}};$

P₁₁The number of overvoltage abnormal events of the voltage transformer is shown;

P₁₂the number of overcurrent abnormal events of the voltage transformer is shown;

P₁₃the number of the abnormal events of the external electric field of the voltage transformer is shown;

P₁₄the number of the abnormal events of the primary conductor magnetic field of the voltage transformer is counted;

P₁₅the number of the abnormal events of the frequency of the voltage transformer is shown;

wherein N isThe total number of the group voltage transformers; n (1. ltoreq. N. ltoreq.N) is the number of voltage transformers in which the family defect occurs, P₇And obtaining values of the defects of the voltage transformer family.