CN106841890B - Fault diagnosis method in cross-connection box based on grounding current - Google Patents
Fault diagnosis method in cross-connection box based on grounding current Download PDFInfo
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Abstract
A fault diagnosis method in a cross-connection box based on grounding current comprises a data acquisition unit, a current coefficient K calculation unit, an unbalance coefficient J calculation unit and a diagnosis parameter K, J comprehensive acquisition fault type unit. The data acquisition unit consists of a grounding current acquisition unit, a grounding current band-pass filtering unit and an information recording unit. The current coefficient K calculating unit consists of a current data information storage unit and a current coefficient calculating unit. The unbalance coefficient J calculating unit consists of a current coefficient storage unit and an unbalance coefficient calculating unit. The diagnosis parameter K, J comprehensive acquisition fault type unit consists of a parameter table unit consisting of normal working condition values and fault values of diagnosis parameters K, J and a comprehensive judgment specific fault type unit. The fault diagnosis method in the cross-connection box based on the grounding current, disclosed by the invention, achieves the purpose of effectively diagnosing three typical faults in the cross-connection box, is small in external interference, low in cost, can be well suitable for lines with different voltage levels, and can be popularized to multi-loop long lines.
Description
Technical Field
The invention relates to the field of fault detection in a power cable metal sheath cross-connection grounding line, in particular to a fault diagnosis method in a cross-connection box based on grounding current.
Background
With the acceleration of urban construction pace in China, the negative demand on electric power is rapidly increased, the underground power grid lays more and more power cable lines, the cable lines become longer and longer, and in order to effectively reduce sheath circulation, the long cable lines all adopt a cross-connection ground system at present.
The cross-connection boxes in the lines are easy to suffer from faults caused by natural or artificial factors, and according to the statistics of fault cases in Guangzhou area, the faults in the cross-connection boxes account for more than half of the total number of the faults of the cross-connection lines each year, such as wiring errors in the cross-connection boxes, breakage of coaxial cables, water inflow in the boxes and the like, after the faults occur, the equivalent circuit of the lines in the whole cross-connection large section changes, so that the current flowing to the earth ground through the metal sheath is abnormal, and serious accidents can be caused if measures are not timely taken. For example, a 110kV single-core cable line under the control of a power supply station fails after two years of operation, and then the cable line is inspected to find that the protection layer protector in the cross-connection box breaks down and burns out at the position of the main cable gallery 520m, and the fault point breaks down and the surrounding is seriously burnt. Post hoc analysis shows that the main protection of this cable line configuration: limiting current and quick breaking; back protection: the composite voltage is over-current. According to operation experience and fault cases, the traditional protection can not effectively avoid accidents in advance, and the normal condition can only make corresponding protection actions for faults.
As the occurrence rate of such faults increases, fault diagnosis is increasingly widely used in systems, and researches around diagnosis techniques are also increasing. At present, more researches focus on an online monitoring system, and a set of measures for grasping the running condition of the whole cross interconnection line are provided through online monitoring of circulation, induced voltage and the like, however, the circulation is influenced by factors such as grounding resistance, load current, laying mode and the like, the reliability of the online monitoring device is unstable and is easily interfered by the outside, the whole line installation device is slightly complicated, and the line cost is higher. Therefore, the research of a set of diagnostic methods with the characteristics of avoiding external environment interference, avoiding influence caused by different working condition changes and reducing the line cost has important significance.
Disclosure of Invention
The invention aims to provide a fault diagnosis method in a cross-connection box based on grounding current, which realizes the purpose of effectively diagnosing three typical faults in the cross-connection box, has small external interference and low cost, can be well applied to lines with different voltage levels, and can be popularized to multi-loop long lines.
The technical scheme adopted by the invention is as follows;
a fault diagnosis method in a cross-connection box based on grounding current comprises a data acquisition unit, a current coefficient K calculation unit, an unbalance coefficient J calculation unit and a diagnosis parameter K, J comprehensive acquisition fault type unit.
The data acquisition unit consists of a grounding current acquisition unit, a grounding current band-pass filtering unit and an information recording unit.
The current coefficient K calculating unit consists of a current data information storage unit and a current coefficient calculating unit.
The unbalance coefficient J calculating unit consists of a current coefficient storage unit and an unbalance coefficient calculating unit.
The diagnosis parameter K, J comprehensive acquisition fault type unit consists of a parameter table unit consisting of normal working condition values and fault values of diagnosis parameters K, J and a comprehensive judgment specific fault type unit.
The diagnosis steps are as follows:
step 1: the grounding current collecting unit collects grounding current information on a grounding wire, and the grounding current band-pass filtering unit is responsible for filtering other harmonic components and only leaves fundamental components; the information recording unit records specific line information and three-phase current data information; step 2: the current data information storage unit receives the current data from the information recording unit; the current coefficient calculating unit calculates a current coefficient; the current coefficient calculation formula is K AB ＝I A /I B 、K BC ＝I B /I C 、K CA ＝I C /I A ，I A 、I B 、I C The three-phase grounding current fundamental wave value;
step 3: the current coefficient storage unit can receive three current coefficients obtained from the current coefficient calculation unit and input standard current coefficient K in advance Standard of (K Standard of =1) and unbalance factor J Standard of (J Standard of =0), the unbalance coefficient calculating unit calculates an unbalance coefficient, the unbalance coefficient calculating formula is J AB ＝(K AB -K Standard of )/K Standard of 、J BC ＝(K BC -K Standard of )/K Standard of 、J CA ＝(K CA -K Standard of )/K Standard of The method comprises the steps of carrying out a first treatment on the surface of the The standard value is the reference value and is equivalent to the comparison of the acquired data with the standard value.
Step 4: the current coefficient storage unit can receive three current coefficients obtained from the current coefficient calculation unit and input standard current coefficient K in advance Standard of (K Standard of =1) and unbalance factor J Standard of (J Standard of =0), the unbalance calculation coefficient unit 3.2 calculates the unbalanceA balance coefficient;
step 5: the parameter table unit composed of the normal working condition value and the fault value of the diagnosis parameter K, J integrates the diagnosis parameter K, J obtained by the current coefficient calculating unit and the unbalance coefficient calculating unit and the K, J value under the normal condition, and the normal value is compared with the fault value to evaluate and compare the diagnosis parameters;
step 6: integrating to form a parameter table composed of normal values and fault values of the diagnosis parameters K, J, and judging the fault type;
step 7: and obtaining the specific fault type according to the specific fault condition.
According to the fault diagnosis method in the cross-connection box based on the grounding current, the grounding current on the direct grounding wires at the two ends of the cross-connection line is directly measured to judge the fault type, the diagnosis parameters provided by the diagnosis method can avoid the influence caused by the change of factors such as load current, grounding resistance and the like, the diagnosis method is simple, strong in operability and high in accuracy, can be popularized to a long line, can avoid the problems that the traditional online monitoring is greatly interfered by the outside and has high cost, and has strong engineering practical guidance significance.
The fault diagnosis method in the cross-connection box based on the grounding current, disclosed by the invention, achieves the purpose of effectively diagnosing three typical faults in the cross-connection box, is small in external interference, low in cost, can be well suitable for lines with different voltage levels, and can be popularized to multi-loop long lines.
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Fig. 1 is a schematic flow chart of the present invention.
Fig. 2 is a diagram of a dual loop 110kV line design as described in the examples.
Detailed Description
The principle of the invention is as follows: the method comprises the steps of directly measuring grounding currents on direct grounding wires at two ends of a cross interconnection line, calculating two judgment parameters of a current coefficient and an unbalance coefficient, wherein the two judgment parameters are provided in a diagnosis method, the influence of different working condition changes such as load current and grounding resistance on judgment accuracy is effectively avoided by the diagnosis parameters, a calculation result is compared with a normal working condition value, and finally specific fault types are comprehensively judged.
A fault diagnosis method in a cross-connection box based on grounding current comprises a data acquisition unit 1, a current coefficient K calculation unit 2, an unbalance coefficient J calculation unit 3 and a diagnosis parameter K, J comprehensive acquisition fault type unit 4.
The data acquisition unit 1 is composed of a grounding current acquisition unit 1.1, a grounding current band-pass filtering unit 1.2 and an information recording unit 1.3. The grounding current collecting unit 1.1 is composed of a zero sequence current transformer with the model of LZCT2-10, the grounding current band-pass filtering unit 1.2 is composed of a Pasternack radio frequency low-pass filter, and the information recording unit 1.3 is an information storage unit and is composed of a data storage module with the model of ZLKCFM 100.
The current coefficient K calculating unit 2 consists of a current data information storage unit 2.1 and a current coefficient calculating unit 2.2. The current data information storage unit 2.1 is composed of a ZLKCFM100 data storage module, and the current coefficient calculation unit 2.2 is an excel table for processing current data in a computer.
The unbalance coefficient J calculating unit 3 consists of a current coefficient storage unit 3.1 and a unbalance coefficient calculating unit 3.2. The current coefficient storage unit 3.1 is composed of a data storage module with the same information recording unit 1.3, the model is ZLKCFM100, and the unbalanced coefficient calculation unit 3.2 is an excel table of processing current data built in a computer
The diagnosis parameter K, J comprehensive acquisition fault type unit 4 consists of a parameter table unit 4.1 consisting of normal working condition values and fault values of diagnosis parameters K, J and a comprehensive judgment specific fault type unit 4.2. The parameter table unit 4.1 consisting of the normal working condition value and the fault value of the diagnosis parameter K, J is composed of a data storage module, the model is ZLKCFM100, the comprehensive judgment specific fault type unit 4.2 can write a data size comparison module by Simulink, and the calculated value and the standard value of the measured data are compared to judge the fault type.
As shown in fig. 1, a fault diagnosis method in a cross-connection box based on a ground current includes the following steps:
in B1, the grounding current acquisition unit 1.1 acquires grounding current information on a grounding wire.
In the B2, the grounded current band-pass filtering unit 1.2 is responsible for filtering other harmonic components, and only the fundamental component and the information recording unit 1.3 are left for recording specific line information and three-phase current data information.
The current data information storage unit 2.1 in B3 receives the current data from the information recording unit 1.3 and the current coefficient calculation unit 2.2 calculates the current coefficient.
In B4, the current coefficient storage unit 3.1 can receive three current coefficients obtained from the current coefficient calculating unit 2.2, and can input a standard current coefficient K in advance Standard of (K Standard of =1) and unbalance factor J Standard of (J Standard of =0), the unbalance coefficient calculation unit 3.2 calculates an unbalance coefficient.
In the step B5, the parameter table unit 4.1 composed of the normal working condition value and the fault value of the diagnostic parameter K, J integrates the diagnostic parameter K, J obtained by the current coefficient calculating unit 2.2 and the unbalance coefficient calculating unit 3.2 and the normal K, J value, and the normal value is compared with the fault value to evaluate and compare the diagnostic parameters.
And B6, integrating to form a normal value and a fault value of the diagnosis parameters K, J to form a parameter table, and judging the fault type.
And B7, obtaining a specific fault type according to the specific fault condition.
Step B1, a grounding current acquisition unit 1.1 acquires grounding current information on a grounding wire; the grounding current band-pass filtering unit 1.2 is responsible for filtering other harmonic components and only leaves fundamental components; the information recording unit 1.3 records specific line information and three-phase current data information.
Step B2 the current data information storage unit 2.1 receives the current data from the information recording unit 1.3; the current coefficient calculating unit 2.2 calculates the current coefficient, and the current coefficient calculating formula is K AB ＝I A /I B 、K BC ＝I B /I C 、K CA ＝I C /I A ，I A 、I B 、I C Is the fundamental wave value of the three-phase grounding current.
Step B3 current coefficient storage unit 3.1 receives the three values from the calculation current coefficient unit 2.2Besides the current coefficient, a standard current coefficient K can be input in advance Standard of (K Standard of =1); the unbalance coefficient calculating unit 3.2 calculates an unbalance coefficient J, and the unbalance coefficient calculating formula is J AB ＝(K AB -K Standard of )/K Standard of 、J BC ＝(K BC -K Standard of )/K Standard of 、J CA ＝(K CA -K Standard of )/K Standard of 。
In step B4, the current coefficient storage unit 3.1 may receive three current coefficients obtained from the current coefficient calculation unit 2.2, and may input the standard current coefficient K in advance Standard of (K Standard of =1) and unbalance factor J Standard of (J Standard of =0), the unbalance coefficient calculation unit 3.2 calculates an unbalance coefficient.
In the step B5, the parameter table unit 4.1 composed of the normal working condition value and the fault value of the diagnostic parameter K, J integrates the diagnostic parameter K, J obtained by the current coefficient calculating unit 2.2 and the unbalance coefficient calculating unit 3.2 and the normal K, J value, and the normal value is compared with the fault value to evaluate and compare the diagnostic parameters.
B6, integrating to form a normal value and a fault value of the diagnosis parameters K, J to form a parameter table, and judging the fault type.
And B7, obtaining the specific fault type according to the specific fault condition.
TABLE 1
As can be seen from table 1, the current coefficient K can effectively determine the coaxial cable fracture fault and determine the fault phase, and the fault phase current coefficient is 0; failure of transposition shows that the three-phase current coefficient has larger difference, the two-phase current coefficient is smaller and smaller than 1, and the one-phase current coefficient is larger and larger than 2; the water is fed into the box, the current coefficients are all about 1, and the difference value of three current coefficients of one water feeding fault is larger than that of two water feeding faults. In view of the fact that the current coefficient is not necessarily capable of effectively distinguishing the water inlet condition of the cross interconnection box in detail, the unbalance coefficient is provided for diagnosing the fault type by taking the K standard as a reference. From the unbalance coefficient J in Table 1, it was found that J of one tank water inlet is larger than that of two tanks water inlet, and J values are quite different. The water inflow in the cross-connection boxes can be effectively and carefully distinguished through the unbalance coefficient. The established evaluation criteria can evaluate three types of faults in the box.
The following is an example of an actual operation of a dual-loop 110kV line in connection with a certain power supply office, where the line situation is shown in fig. 2. The details are described in connection with the above specific implementation of steps 1-7.
The entire line is as follows: the middle part is provided with four cross-connection boxes in total, two ends of a line are directly grounded, and the grounding currents of the grounding wires of the four cross-connection boxes in the joint wells A1, A2, A3 and A4 are monitored through a PMS state monitoring unit. Table 2 gives part of the monitoring data.
Table 2 actual measurement of ground current
And 5 months of the whole southern area continuously rains in a large quantity, the large-area disaster is seriously suffered in each area, and a power transmission line state monitoring center operator discovers an alarm of a 110kV line A3 well cable sheath circulation on-line monitoring device through a PMS state monitoring unit. The field investigation shows that most of the interconnection boxes in the well are immersed in water, obvious rust exists outside the boxes, and other wells are in normal condition. The ground wire current was monitored on site using a pincer ammeter for the line with faults and the data are shown in table 3.
Table 3 actual measurement of ground current
As can be seen from tables 2 and 3, the current is maintained at about 5A under normal conditions, and the current coefficient and the unbalance coefficient are 1 and 0, respectively. Once a fault occurs in the tank, such as that in the example, all water is fed into one tank, at this time, the three current coefficients are all about 1, the unbalance coefficients are all above 20%, and the unbalance coefficients are greatly different. The diagnosis method taking the current coefficient and the unbalance coefficient as the criteria can judge the fault through the head-to-ground grounding current in time.
Claims (1)
1. A fault diagnosis method in a cross-connection box based on grounding current is characterized in that: the system comprises a data acquisition unit (1), a current coefficient K calculation unit (2), an unbalance coefficient J calculation unit (3) and a diagnosis parameter K, J comprehensive fault type acquisition unit (4); the data acquisition unit (1) consists of a grounding current acquisition unit (1.1), a grounding current band-pass filtering unit (1.2) and an information recording unit (1.3); the current coefficient K calculating unit (2) consists of a current data information storage unit (2.1) and a current coefficient calculating unit (2.2); the unbalance coefficient J calculating unit (3) consists of a current coefficient storage unit (3.1) and an unbalance coefficient calculating unit (3.2); the diagnosis parameter K, J comprehensive acquisition fault type unit (4) consists of a parameter table unit (4.1) consisting of normal working condition values and fault values of diagnosis parameters K, J and a comprehensive judgment specific fault type unit (4.2);
the diagnosis steps are as follows:
step 1: the grounding current acquisition unit (1.1) acquires grounding current information on a grounding wire, and the grounding current band-pass filtering unit (1.2) is used for filtering other harmonic components and only leaving fundamental components; an information recording unit (1.3) records specific line information and three-phase current data information;
step 2: the current data information storage unit (2.1) receives the current data from the information recording unit (1.3); a current coefficient calculating unit (2.2) calculates a current coefficient; the current coefficient calculation formula is K AB =I A /I B 、K BC =I B /I C 、K CA =I C /I A ，I A 、I B 、I C The three-phase grounding current fundamental wave value;
step 3: the current coefficient storage unit (3.1) can receive three current coefficients obtained from the current coefficient calculation unit (2.2) and input a standard current coefficient K in advance Standard of And unbalance coefficient J Standard of The unbalance coefficient calculating unit (3.2) calculates the unbalance coefficient, and the unbalance coefficient calculating formula is J AB =（K AB -K Standard of ）/K Standard of 、J BC =（K BC -K Standard of ）/K Standard of 、J CA =（K CA -K Standard of ）/K Standard of ；
Step 4: the parameter table unit (4.1) consisting of the normal working condition value and the fault value of the diagnosis parameter K, J integrates the diagnosis parameter K, J obtained by the current coefficient calculating unit (2.2) and the unbalance coefficient calculating unit (3.2) and the K, J value under the normal condition, and the normal value is compared with the fault value to evaluate and compare the diagnosis parameters;
step 5: integrating to form a parameter table composed of normal values and fault values of the diagnosis parameters K, J, and judging the fault type;
step 6: and obtaining the specific fault type according to the specific fault condition.
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