A primary switch mechanism sticking discrimination method based on recording wave

Abstract

The application provides a kind of based on oscillograph primary switch mechanism jamming discrimination method, the jamming discrimination method specifically is to call the historical voltage data and historical current data of electric operation circuit under normal state, obtains standard voltage waveform and standard current waveform, real-time identification DTU equipment sends opening and closing exit instruction, and when identifying that DTU equipment sends opening and closing exit instruction, start voltage oscillograph and current oscillograph of electric operation circuit, obtain oscillograph data in the process of opening and closing operation, compare it with standard voltage waveform and standard current waveform, obtain the jamming judgment result of primary switch mechanism based on comparison result, and when the jamming judgment result of primary switch mechanism shows that primary switch mechanism exists jamming condition, the jamming condition of primary switch mechanism is sent to distribution main station through alarm remote signaling.The application does not need to install equipment to primary equipment, can adapt to the distribution network modification limit under different complex environment, and is more applicable.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power distribution automation, in particular to a primary switch mechanism jamming discrimination method based on recording wave. BACKGROUND

[0002] Remote control function is the basis for the continuous expansion of power distribution automation and its advanced applications, and the primary electric operation mechanism is a key link related to whether the remote control operation can be correctly executed. In order to ensure the implementation of the remote control function, it is necessary to ensure the normal operation of the primary electric operation mechanism. Due to the characteristics of the distribution network, the updating speed of the primary equipment is far slower than that of the secondary equipment. In the existing distribution network, there is a certain amount of old equipment in the primary equipment, which greatly increases the risk of remote control refusal caused by mechanism jamming.

[0003] In order to reduce the probability of occurrence of remote control refusal caused by mechanism jamming, it is necessary to discriminate the jamming condition of the primary mechanism, so as to timely handle the jamming abnormity and reduce the risk of remote control refusal. However, the existing discrimination method of the jamming condition of the primary mechanism is mostly realized by adding equipment for data collection and analysis, but the environment of the distribution network is relatively complex, and such adding equipment method has low applicability and cannot be used in the distribution network on a large scale. SUMMARY

[0004] The purpose of the present application is to overcome the shortcomings in the prior art, and to provide a primary switch mechanism jamming discrimination method based on recording wave. The voltage recording and current recording of the electric operation circuit are started after the DTU device sends the opening and closing outlet instruction, and the jamming is judged based on the comparison result of the obtained recording wave data and the standard voltage waveform and the standard current waveform of the electric operation circuit under normal state. The problem of the need to add equipment and the low applicability in the existing primary equipment jamming condition judgment method can be solved, and the primary switch mechanism jamming judgment of the distribution network under various environments can be applied, and the applicability is higher.

[0005] The purpose of the present application is realized by the following technical scheme:

[0006] A primary switch mechanism jamming discrimination method based on recording wave, comprising:

[0007] The historical voltage data and the historical current data of the electric operation circuit under normal state are retrieved, and the standard voltage waveform and the standard current waveform are obtained based on the retrieved historical voltage data and the historical current data of the electric operation circuit under normal state;

[0008] The opening and closing outlet instruction sent by the DTU device is identified in real time, and when the opening and closing outlet instruction sent by the DTU device is identified, the voltage recording and current recording of the electric operation circuit are started, and the recording wave data in the opening and closing operation process are obtained;

[0009] The acquired recording wave data in the opening and closing operation process is compared with the standard voltage waveform and the standard current waveform, a first switch mechanism sticking judgment result is acquired based on the comparison result, if the first switch mechanism sticking judgment result shows that the first switch mechanism exists sticking condition, the sticking condition of the first switch mechanism is uploaded to the power distribution master station through alarm remote signaling, if the first switch mechanism sticking judgment result shows that the first switch mechanism does not exist sticking condition, it is judged that the first switch mechanism operates normally, the opening and closing export instruction issued by the DTU device is continued to be identified, and the sticking discrimination of the first switch mechanism is carried out.

[0010] Further, when the acquired recording wave data in the opening and closing operation process is compared with the standard voltage waveform and the standard current waveform, comparison samples are first constructed based on the standard voltage waveform and the standard current waveform, and the specific process of constructing the comparison samples based on the standard voltage waveform and the standard current waveform is that: first, the instantaneous values of each inflection point in the standard voltage waveform and the standard current waveform are calculated, and the operation stages of the electric operation circuit in the opening and closing operation process are divided based on the instantaneous value calculation results of each inflection point, and the travel time of each operation stage is calculated, and the instantaneous value calculation results of each inflection point and the travel time of each operation stage acquired from the standard voltage waveform and the standard current waveform are taken as standard data to construct the comparison samples.

[0011] Further, after the operation stages of the electric operation circuit in the opening and closing operation process are divided based on the instantaneous value calculation results of each inflection point, the loop resistance of the electric operation circuit in each operation stage is also calculated based on the standard voltage waveform corresponding to the divided operation stage, and the operating voltage of each operation stage is acquired based on the standard voltage waveform corresponding to the divided operation stage, and the loop resistance of the electric operation circuit in each operation stage and the operating voltage of each operation stage are also taken as standard data to join the comparison samples.

[0012] Further, after the comparison samples are constructed, the acquired recording wave data in the opening and closing operation process is further subjected to feature extraction, and each kind of feature data extracted is compared with the corresponding standard data in the sample data in sequence, and the comparison result of the recording wave data in the opening and closing operation process with the standard voltage waveform and the standard current waveform is acquired.

[0013] Further, the feature data includes the loop resistance, the maximum instantaneous power, the current inflection point instantaneous value and the travel time of each stage in the opening and closing operation process.

[0014] Further, after the first switch mechanism sticking judgment result is acquired based on the comparison result, if the first switch mechanism sticking judgment result shows that the first switch mechanism does not exist sticking condition, the standard voltage waveform and the standard current waveform are also updated according to the recording wave data.

[0015] Further, when starting voltage recording and current recording of the electric operation circuit, the recording data in the opening and closing operation process is acquired through the Hall sensor.

[0016] The beneficial effects of the present application are:

[0017] After the DTU device issues the opening and closing outlet instructions, the voltage recording and current recording of the electric operation circuit are started, and the sticking judgment is realized based on the comparison result of the acquired recording data and the standard voltage waveform and the standard current waveform of the electric operation circuit in the normal state, the data acquisition process and the data analysis process do not need to add equipment to the primary equipment, can adapt to the distribution network modification restriction in different complex environments, and has higher applicability. And when the sticking is judged, the information is directly uploaded through the alarm remote signaling, the problem that the existing equipment is added to realize the sticking judgment, and the ability of pushing the abnormal information to the operation and maintenance personnel is relatively insufficient is solved, and the efficiency of uploading the abnormal condition is improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a flowchart of the present application;

[0019] Figure 2 is an equivalent circuit diagram of the electric operation circuit of the embodiment of the present application. DETAILED DESCRIPTION

[0020] The present application is further described below in combination with the drawings and embodiments.

[0021] Embodiment:

[0022] A primary switch mechanism sticking discrimination method based on recording, as shown in Figure 1 , comprising:

[0023] The historical voltage data and the historical current data of the electric operation circuit in the normal state are called, and the standard voltage waveform and the standard current waveform are acquired based on the called historical voltage data and the historical current data of the electric operation circuit in the normal state;

[0024] The opening and closing outlet instructions issued by the DTU (distribution automation terminal) device are identified in real time, and when the opening and closing outlet instructions issued by the DTU device are identified, the voltage recording and current recording of the electric operation circuit are started, and the recording data in the opening and closing operation process is acquired;

[0025] The obtained recording wave data in the process of opening and closing operation is compared with standard voltage waveform and standard current waveform, a jamming determination result of the primary switch mechanism is obtained based on the comparison result, if the jamming determination result of the primary switch mechanism shows that the primary switch mechanism has jamming condition, the jamming condition of the primary switch mechanism is uploaded to the power distribution master station through alarm remote signaling, if the jamming determination result of the primary switch mechanism shows that the primary switch mechanism has no jamming condition, it is judged that the primary switch mechanism is in normal operation, the opening and closing exit instruction issued by the DTU device is continuously identified, and the jamming of the primary switch mechanism is discriminated.

[0026] In identifying the opening and closing exit instruction issued by the DTU device, the operation of the operation power source output by the DTU device can be identified, and the recording wave data of the electric operation circuit is recorded immediately when the operation power source output by the DTU device operates.

[0027] In comparing the obtained recording wave data in the process of opening and closing operation with standard voltage waveform and standard current waveform, comparison samples are first constructed based on standard voltage waveform and standard current waveform, and the specific process of constructing comparison samples based on standard voltage waveform and standard current waveform is that the instantaneous values of each inflection point in the standard voltage waveform and the standard current waveform are first calculated, the operation stage of the electric operation circuit in the process of opening and closing operation is divided based on the calculation results of the instantaneous values of each inflection point, the travel time of each operation stage is calculated, and the calculation results of the instantaneous values of each inflection point obtained by the standard voltage waveform and the standard current waveform and the travel time of each operation stage are taken as standard data to construct comparison samples.

[0028] In the process of opening and closing operation, the current in the electric operation circuit will present different fluctuation characteristics due to the switch position of the primary switch. Taking a circuit breaker as an example, in the process of opening and closing of the circuit breaker operating mechanism, it can be divided into five operation stages.

[0029] In the first stage, the operation power source output by the DTU device supplies power, the closing coil in the electric operation circuit is powered off, at this time, the air gap in the electric operation circuit is maximum, the air gap reluctance is maximum, and the inductance is minimum, before the moving iron core in the circuit breaker operating mechanism starts to move, the current will continuously increase.

[0030] In the second stage, after the moving iron core starts to move, the air gap of the magnetic circuit will decrease, the air gap reluctance will decrease, the inductance of the coil will increase, and the current will decrease accordingly.

[0031] In the third stage, after the moving iron core moves to the position, the energy storage mechanism in the circuit breaker operating mechanism will release the stored energy until the moving contact starts to move, in this process, the current will continuously increase.

[0032] In the fourth stage, after the moving contact starts to move, the current on the closing coil in the electric operation circuit is approximately steady state.

[0033] In the fifth stage, the operating power output by the DTU device is cut off, an electric arc is generated between the auxiliary contact of the circuit breaker, and is quickly elongated. With the increase of the arc voltage, the current gradually decreases until the arc is extinguished, and the current on the coil is reduced to zero.

[0034] Therefore, the current characteristics of different operation stages can be obtained according to the type of the primary switch mechanism, so that the division of each operation stage is realized by analyzing the instantaneous values of each inflection point.

[0035] After the operation stages of the electric operating circuit in the opening and closing operation process are divided based on the calculation results of the instantaneous values of the inflection points, the loop resistance of the electric operating circuit in each operation stage is calculated based on the standard voltage waveform corresponding to the divided operation stage, and the operating voltage of each operation stage is obtained based on the standard voltage waveform corresponding to the divided operation stage. The loop resistance of the electric operating circuit in each operation stage and the operating voltage of each operation stage are also added to the comparison sample as standard data.

[0036] After the comparison sample is constructed, the feature data of the obtained recording wave data in the opening and closing operation process is extracted, and each kind of extracted feature data is compared with the corresponding standard data in the sample data in sequence, so as to obtain the comparison results of the recording wave data in the opening and closing operation process and the standard voltage waveform and the standard current waveform.

[0037] The feature data includes the loop resistance, the maximum instantaneous power, the current inflection point instantaneous value and the stroke time of each stage in the opening and closing operation process.

[0038] When the comparison result shows that the loop resistance increases, the operating voltage is under-voltage, the instantaneous power increases and the stroke time of the operation stage is too long, it is judged that there is a sticking situation.

[0039] After the sticking judgment result of the primary switch mechanism is obtained based on the comparison result, if the sticking judgment result of the primary switch mechanism shows that there is no sticking situation of the primary switch mechanism, the standard voltage waveform and the standard current waveform are updated according to the recording wave data of the primary switch mechanism which is judged to have no sticking situation and is normally running.

[0040] Because there is a slight error in the running process, the standard voltage waveform and the standard current waveform are updated according to the recording wave data of the primary switch mechanism which is judged to have no sticking situation and is normally running, so as to reduce the influence of the error on the sticking discrimination result of the primary switch mechanism and improve the accuracy of the sticking discrimination result.

[0041] When the voltage recording and current recording of the electric operating circuit are started, the recording wave data in the opening and closing operation process is obtained by the Hall sensor.

[0042] When the loop resistance of the electric operating circuit is calculated, an equivalent circuit of the electric operating circuit is first constructed, and the equivalent circuit of the electric operating circuit is as followsFigure 2 As shown.

[0043] Taking the moment when the electric control circuit is closed as time 0, its current is a function of time t, and the inductance L changes with the switch position x. When the switch is closed and the status is displayed as open, the switch position x is 0.

[0044] Taking the first phase as an example, by Figure 2 From the equivalent circuit, we can see that:

[0045]

[0046] Where E is the electromotive force of the operating power supply output by the DTU equipment, R is the loop resistance of the electrical control circuit, and L... x Let t be the inductance value of the electric control circuit corresponding to the current switch position x, where x is the switch position, i is the current value of the electric control circuit, and t is the time.

[0047] Solving the above equation, we get:

[0048]

[0049]

[0050] Where e is the natural constant, i max L represents the maximum current amplitude of the electric control circuit at the last moment of the current stage, and L represents the inductance of the electric control circuit.

[0051] Then, select two data points from the current waveform of the acquired waveform data. Based on the voltage value of the operating power supply output by the DTU equipment, the inductance and circuit resistance of the electric operating circuit can be calculated using the above formula.

[0052] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any way. Other variations and modifications are possible without departing from the technical solutions described in the claims.

Claims

1. A method for judging the sticking of a primary switch mechanism based on a recording wave, characterized in that, The method comprises the following steps: acquiring historical voltage data and historical current data of the electric operating circuit in a normal state, and acquiring standard voltage waveform and standard current waveform based on the acquired historical voltage data and historical current data of the electric operating circuit in the normal state; real-time identifying the opening and closing outlet instruction issued by the DTU device, and starting voltage recording and current recording of the electric operating circuit when the opening and closing outlet instruction issued by the DTU device is identified, and acquiring recording data in the opening and closing operation process; comparing the acquired recording data in the opening and closing operation process with the standard voltage waveform and the standard current waveform, acquiring the jamming judgment result of the primary switch mechanism based on the comparison result, and uploading the jamming condition of the primary switch mechanism to the power distribution master station through alarm remote signaling when the jamming judgment result of the primary switch mechanism shows that the primary switch mechanism exists jamming condition, and judging that the primary switch mechanism normally operates when the jamming judgment result of the primary switch mechanism shows that the primary switch mechanism does not exist jamming condition, continuing to identify the opening and closing outlet instruction issued by the DTU device, and performing the jamming discrimination of the primary switch mechanism; after acquiring the jamming judgment result of the primary switch mechanism based on the comparison result, updating the standard voltage waveform and the standard current waveform according to the recording data of this time when the jamming judgment result of the primary switch mechanism shows that the primary switch mechanism does not exist jamming condition.

2. The method according to claim 1, wherein the method is characterized by, When comparing the acquired recording data in the opening and closing operation process with the standard voltage waveform and the standard current waveform, first, a comparison sample is constructed based on the standard voltage waveform and the standard current waveform, and the specific process of constructing the comparison sample based on the standard voltage waveform and the standard current waveform is as follows: first, the instantaneous values of each inflection point in the standard voltage waveform and the standard current waveform are calculated, and the operation stages of the electric operating circuit in the opening and closing operation process are divided based on the calculation results of the instantaneous values of each inflection point, and the travel time of each operation stage is calculated, and the calculation results of the instantaneous values of each inflection point and the travel time of each operation stage obtained by the standard voltage waveform and the standard current waveform are taken as standard data to construct the comparison sample.

3. The method according to claim 2, wherein the method comprises the steps of: determining the number of times the first switch mechanism is opened and closed; and determining whether the first switch mechanism is stuck based on the number of times the first switch mechanism is opened and closed. After dividing the operation stages of the electric operating circuit in the opening and closing operation process based on the calculation results of the instantaneous values of each inflection point, the loop resistance of the electric operating circuit in each operation stage is also calculated based on the standard voltage waveform corresponding to the divided operation stage, and the operating voltage of each operation stage is obtained based on the standard voltage waveform corresponding to the divided operation stage, and the loop resistance of the electric operating circuit in each operation stage and the operating voltage of each operation stage are also taken as standard data to join the comparison sample.

4. The method according to claim 3, wherein the method comprises the steps of: determining the number of times the first switch mechanism is opened and closed; and determining whether the first switch mechanism is stuck based on the number of times the first switch mechanism is opened and closed. After the comparison sample is constructed, the recording data in the opening and closing operation process is extracted, and each kind of extracted feature data is compared with the corresponding standard data in the sample data in turn, and the comparison result of the recording data in the opening and closing operation process with the standard voltage waveform and the standard current waveform is obtained.

5. The method according to claim 4, wherein the method comprises the steps of: determining the number of times the first switch mechanism is opened and closed; and determining whether the number of times the first switch mechanism is opened and closed is greater than a predetermined number of times. The feature data includes the loop resistance in the opening and closing operation process, the maximum instantaneous power, the current inflection point instantaneous value and the travel time of each stage.

6. The method for judging the sticking of a single switch mechanism based on the recording wave according to claim 1, characterized in that, When starting the voltage recording and current recording of the electric operating circuit, the recording data in the opening and closing operation process is acquired through a Hall sensor.

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