CN210665923U - Single-phase earth fault line selection device of low current grounding system - Google Patents
Single-phase earth fault line selection device of low current grounding system Download PDFInfo
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- CN210665923U CN210665923U CN201920879139.6U CN201920879139U CN210665923U CN 210665923 U CN210665923 U CN 210665923U CN 201920879139 U CN201920879139 U CN 201920879139U CN 210665923 U CN210665923 U CN 210665923U
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Abstract
The utility model discloses a single-phase earth fault route selection device of undercurrent grounding system, include: the intelligent controller comprises an intelligent controller, a capacitor, a resistor, a switching device, a data acquisition device, a voltage transformer and a plurality of current transformers; the capacitor and the resistor are connected in parallel to form a branch circuit and are connected in series with the switching device; the intelligent controller can control the switching device to respectively input the capacitor and the resistor into the neutral point grounding branch. The capacitor and the resistor can be quickly controlled to be connected into the neutral point grounding branch for multiple times, the neutral point grounding loop is changed for a short time, the zero sequence current of the fault line is subjected to phase jump and amplitude mutation, and the line with the maximum change of the zero sequence current change phase and amplitude is analyzed to be used as the fault line.
Description
Technical Field
The utility model relates to a relay protection, distribution network technical field especially indicate a single-phase earth fault route selection device of undercurrent grounding system.
Background
In a medium-voltage distribution system, a neutral point non-effective grounding mode is adopted for improving the power supply reliability, and the current of a line to ground capacitor is compensated by a grounding mode through an arc suppression coil, but the problem of difficulty in single-phase ground fault line selection is brought. If the fault line cannot be selected and cut off in time, fault diffusion and power failure accidents are easily caused.
At present, numerous methods are proposed for fault line selection, including a power component method, an injection method, a disturbance method, a harmonic wave method and the like. However, the efficiency of line selection is still low due to various reasons such as complicated actual field conditions, difficulty in control, and unobvious fault characteristics, and a power failure accident caused by a single-phase earth fault occurs occasionally.
Therefore, fault line selection is still a difficult problem in a distribution network system, and a high-efficiency fault line selection device is urgently needed.
SUMMERY OF THE UTILITY MODEL
In view of this, the present invention provides a single-phase ground fault line selection device for a low-current grounding system of a fault line, which can improve the line selection efficiency.
Based on above-mentioned purpose the utility model provides a single-phase earth fault route selection device of undercurrent grounding system, include:
the intelligent controller comprises an intelligent controller, a capacitor, a resistor, a switching device, a data acquisition device, a voltage transformer and a plurality of current transformers;
the voltage transformer is used for acquiring three-phase voltage signals of a bus, and the data acquisition device is connected with the voltage transformer and acquires information of the voltage transformer into the data acquisition device; the current transformers are respectively used for collecting current signals of a plurality of lines to be tested; the data acquisition device is respectively connected with the plurality of current transformers and acquires the information of the plurality of current transformers into the data acquisition device; the capacitor and the resistor are connected in parallel; the intelligent controller can control the switching device to respectively put the capacitor and the resistor into a neutral point grounding branch; the intelligent controller is connected with the data acquisition device through a data communication line.
In one embodiment, the switching device comprises a switching switch connected with the intelligent controller, and the switching switch is connected with a parallel branch formed by the capacitor and the resistor in series to form a branch and is connected with a neutral grounding circuit in parallel.
In one embodiment, the on-off switch comprises a mechanical quick switch.
In one embodiment, the switch comprises a power electronic switch.
In one embodiment, the intelligent controller comprises:
the signal receiving unit is used for receiving the three-phase voltage signals and the current signals acquired by the data acquisition device;
the signal processing unit is used for processing the voltage signals and the current signals received by the signal receiving unit, analyzing the phase variation and the amplitude variation of the zero sequence current of the plurality of lines to be tested, and screening the line with the maximum phase variation and amplitude variation;
and the control unit is used for receiving the processing result of the signal processing unit and the feedback signal of the signal feedback unit, adjusting the preset switching duration and outputting a switching-on signal to the switching device.
From the above, can see, the utility model provides a single-phase earth fault route selection device of undercurrent ground system, when the intelligent control ware confirms that single-phase earth fault takes place, through the switching device, send control signal, in quick control condenser and the resistor access neutral point ground connection branch road, change the zero sequence current that neutral point ground return circuit made the fault line for a short time and take place phase jump and amplitude sudden change, control signal and a plurality of current transformer's sampling pulse is synchronous to time, through the circuit that the biggest change all takes place for the current signal of a plurality of circuit that await measuring and analysis zero sequence current change phase place and amplitude that gathers the input moment. The control signal of the switching switch is repeatedly coded and controlled, and can be switched for many times. The method has the advantages that (1) the technical requirements of primary main equipment and the grounding safety requirements do not need to be changed. In the transient process, the input time of each adjustable capacitor and adjustable resistor grounding control circuit is controlled between 20 milliseconds and 100 milliseconds, so that large abrupt change of the phase and amplitude of zero-sequence current can be generated, a complete sampling waveform can be obtained, and the grounding mode can be prevented from being changed for a long time to avoid fault expansion; (2) by collecting a first current signal and a second current signal of an adjustable capacitor and an adjustable resistor within a preset time, the zero-sequence current is simply calculated, the phase change and the amplitude change are rapidly compared, and the running time is short; (3) the values of the adjustable capacitor and the adjustable resistor and the preset switching time duration can be repeatedly subjected to coding control, the adjustable capacitor and the adjustable resistor can be repeatedly put on a neutral grounding circuit, line selection analysis can be repeatedly performed, and the line selection accuracy is ensured.
Drawings
Fig. 1 is a circuit diagram of a single-phase earth fault line selection device of a low-current grounding system according to an embodiment of the present invention;
fig. 2 is a signal flow diagram of the single-phase earth fault line selection device of the low-current grounding system according to the embodiment of the present invention;
fig. 3 is a flowchart of a line selection method of the single-phase earth fault device of the low-current grounding system according to the embodiment of the present invention;
fig. 4 is the utility model discloses intelligent control ware adjustment is preset the capacitance value, is preset the resistance value and is predetermine long flowchart.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings.
Referring to fig. 1, the present invention provides a single-phase earth fault line selection device for a low current grounding system, including:
intelligent controlSystem DO, capacitor C0An electrical resistor R0Switching device S, data acquisition device, voltage transformer PT and a plurality of current transformers CT1,CT2,…….CTn；
The voltage transformer is used for acquiring three-phase voltage signals of a bus, and the data acquisition device is connected with the voltage transformer and acquires information of the voltage transformer into the data acquisition device; the current transformers are respectively used for collecting current signals of a plurality of lines to be tested; the data acquisition device is respectively connected with the plurality of current transformers and acquires the information of the plurality of current transformers into the data acquisition device; the capacitor and the resistor are connected in parallel; the intelligent controller can control the switching device to simultaneously switch the capacitor and the resistor into a neutral point grounding branch; the intelligent controller is connected with the data acquisition device through a data communication line.
It should be noted that, the grounding transformer in the low-current grounding system is grounded through the arc suppression coil, and a plurality of lines to be tested are led out from the bus. The neutral point grounding branch is connected with the grounding transformer.
The neutral grounding branch is grounded by way of an arc suppression coil L. When single-phase fault grounding occurs, the ground capacitance currents of the non-fault phases of the lines to be tested form a loop flowing back bus through the grounding point, the fault current of the grounding point is too high, the arc suppression coil compensates the ground capacitance currents of the non-fault phases of the lines in an overcompensation mode, the compensation mode is universally adopted, and specific principles are not repeated in the application.
The intelligent controller is used for detecting three-phase voltage signals of the bus and current signals of a plurality of lines to be detected, processing and analyzing the detected voltage and current signals to determine whether the power grid has single-phase earth faults or not, controlling the switching device to switch in and cut off the capacitor and the resistor in due time according to an analysis result, and judging a fault line according to the processing and analysis of the detected current signals of the lines to be detected. Specifically, the intelligent controller comprises a signal receiving unit, a signal processing unit and a control unit.
The signal receiving unit is used for receiving signals communicated by the data acquisition device, wherein the signals are specifically three-phase voltage signals and current signals;
the signal processing unit is used for processing the three-phase voltage signals and the plurality of current signals received by the signal receiving unit, analyzing the phase variation and the amplitude variation of the zero-sequence current of the plurality of lines to be tested, and screening the line with the maximum phase variation and amplitude variation;
and the control unit is used for receiving the processing result of the signal processing unit, selecting switching time, adjusting preset duration and outputting a conducting signal to the switching device.
The switching device can be a mechanical quick switch. It may also be a power electronic switch, for example two thyristors connected in parallel and in reverse. Specifically, the switching device is a mechanical fast switch, and the mechanical fast switch is connected in series with a parallel branch formed by the capacitor and the resistor to form a branch which is connected in parallel with the neutral grounding circuit.
The control unit can control and regulate the mechanical quick switch to be switched on or switched off.
Optionally, the data acquisition device may include a current signal sensor and a voltage signal sensor.
Referring to fig. 2, the utility model provides a single-phase earth fault route selection device of undercurrent ground system is when using, and the signal circulation process includes the voltage signal that voltage transformer gathered and the current signal that a plurality of current transformer gathered, flows into intelligent control ware through data acquisition device, processes the back through signal receiving unit, signal processing unit and the control unit in proper order, and intelligent control ware output switches on the signal, switches on the signal and flows into mechanical switch, accomplishes the control signal circulation so far.
Please refer to fig. 3, the present invention further provides a line selection method of the single-phase earth fault line selection device of the low-current grounding system, comprising:
s100, after the intelligent controller judges and determines that a small current grounding system has a single-phase grounding fault according to three-phase voltage signals of a bus collected by a voltage transformer, a capacitor with a fixed capacitance value and a resistor with a fixed resistance value are respectively put into a neutral grounding circuit for a preset time;
s200, a plurality of current transformers respectively collect current signals of a plurality of lines to be detected within the preset time length, and the current signals are transmitted to the intelligent controller through the data acquisition device;
s300, respectively calculating the zero sequence currents of the multiple lines to be tested by the intelligent controller according to the current signals, and respectively analyzing the phase variation and the amplitude variation of the zero sequence currents of the multiple lines to be tested according to the variation of the zero sequence currents within the preset time;
s400, the intelligent controller compares the phase variation and the amplitude variation of the zero sequence current of the lines to be tested, and screens out the line with the maximum phase variation and amplitude variation, namely the fault line.
In step S100, the determining, by the intelligent controller, that the single-phase ground fault occurs in the low-current ground system according to the three-phase voltage signal of the bus collected by the voltage transformer may specifically include:
the signal receiving unit receives a three-phase voltage value of a bus collected by the voltage transformer;
the signal processing unit processes the three-phase voltage values, compares the magnitude relation between the sum of the three-phase voltage values and a preset voltage threshold value, and transmits the comparison result to the control unit through the signal feedback unit; if the sum of the three-phase voltage values is larger than a threshold value, judging that the small-current grounding system has a single-phase grounding fault;
after the preset time, if the control unit still judges that the system has the single-phase earth fault, the small-current earth system is determined to have the single-phase earth fault.
It should be noted that, the sum of the three-phase voltage values is zero under normal conditions, and the sum of the three-phase voltage values rises to three times of the normal voltage value during fault, so the set voltage threshold is between one time and three times of the normal voltage value.
Preferably, in step S100, the switching device puts a capacitor with a fixed capacitance value and a resistor with a fixed resistance value on the ground of the neutral point for a preset time period, and may include: the switching device puts a capacitor with a fixed capacitance value and a resistor with a fixed resistance value into a neutral grounding circuit for a plurality of times for a preset time, can better make sudden changes of the phase and amplitude of the zero-sequence current of a fault circuit, and integrates a plurality of results to analyze and select the circuit, thereby further improving the accuracy of the circuit selection.
Specifically, the preset capacitance value is larger than the over-compensated capacitance value of the arc suppression coil. The adjustable capacitor C0The adjustment of the preset capacitance value needs to consider that the part of the over-compensation of the arc suppression coil is offset, and simultaneously, the grounding capacitance current of the non-fault phase of the fault line is also offset, so that the zero sequence current direction of the fault line is from the bus to the line, and suddenly changes from the line to the bus, and the obvious difference of the phase of the zero sequence current of the fault line and the non-fault line is caused. Under the condition of unknown fault line, C needs to be corrected on the basis of canceling out overcompensation part of arc suppression coil0The preset capacitance value is adjusted to be large.
Specifically, the value of the resistance value may be determined according to the magnitude of the fault point grounding current to be controlled. Switching the adjustable resistor R with a predetermined resistance value0In the period, the grounding current of the fault point flows through the active component, so that the amplitude of the zero sequence current of the fault line is suddenly changed, and the amplitude of the zero sequence current of the non-fault line is not influenced. This is used as one of the bases for judging the faulty line. Meanwhile, the active component in the fault point grounding current can also generate certain change to the phase of the zero sequence current. Resistor R0The resistance value of (a) needs to be larger than a resistance value Rmin,
wherein U ispkIs the peak voltage of the neutral point, IpkThe maximum value of the current peak is grounded for the fault point which needs to be controlled.
Preferably, in step S100, the switching device puts a capacitor with a fixed capacitance value and a resistor with a fixed resistance value into a ground of the neutral point ground for a preset time period, and the switching device includes:
the switching device is used for respectively switching a capacitor with a fixed capacitance value and a resistor with a fixed resistance value into a neutral grounding circuit for a preset time length for multiple times, and the preset time length values are different every time. The preset time length is adjusted for multiple times, the value of the preset time length is different every time, the sudden change of the phase and the amplitude of the zero sequence current of the fault line can be better manufactured, the line selection is analyzed by integrating multiple results, and the line selection accuracy is further improved.
Specifically, the closing (switching-out) timing is adjusted according to the neutral point voltage, and the capacitor and the resistor are switched so that the sudden change amount of the closing inrush current increases. Preferably, the time of the peak of the voltage value in the voltage waveform of the neutral point is selected to be switched on, and the preset time duration is 20 milliseconds to 100 milliseconds. The method can generate a large abrupt change and obtain a complete sampling waveform, and can ensure that the grounding mode is not changed for a long time so as not to enlarge faults.
In step S200, the intelligent controller performs centralized processing and analysis on the voltage and current signal variables generated after the capacitor and the resistor are put into use, in consideration of the delay time of the acquisition signal and the conversion signal.
And when the switching time and/or the preset duration are adjusted for multiple times in the step S100, correspondingly and sequentially performing the steps S200 to S400 for multiple times, performing comprehensive comparison according to analysis results of multiple times, and judging the line with the maximum mutation of the zero-sequence current in the line as a fault line.
The utility model discloses a single-phase earth fault route selection device of undercurrent ground system is when using, and voltage transformer gathers generating line three-phase voltage value to with voltage signal transmission to data acquisition device, send to the signal reception unit through data communication again, the big or small relation between rethread signal processing unit comparison three-phase voltage value sum and the voltage threshold value, and transmit the comparison result to the control unit. And when the control unit continuously judges that the single-phase earth fault occurs within a certain time, starting fault line selection. And when the line is selected, changing the value of preset input time for many times, outputting a conducting signal to the fling-cut switch, and controlling the preset time of the capacitor and the resistor. The current transformers respectively collect current signals of a plurality of lines to be tested. The acquired signals are transmitted to a data acquisition device through a signal receiving unit and are transmitted to the signal receiving unit in a communication mode, phase variation and amplitude variation of zero-sequence current of a plurality of lines to be detected are correspondingly calculated in a signal processing unit, results of multiple times of comparison are integrated, and the line with the maximum phase variation and amplitude variation of the zero-sequence current is screened out and used as a fault line.
The utility model discloses a single-phase earth fault route selection device of undercurrent ground system, when the intelligent control ware confirms that single-phase earth fault takes place, send control signal, through the fling-cut switch, during quick control condenser and resistor access neutral point ground branch road, change the zero sequence current that neutral point ground return circuit made the fault line for a short time and take place phase jump and amplitude sudden change, control signal and a plurality of current transformer's sampling pulse is synchronous to time, through gathering the current signal and the analysis zero sequence current of many circuit that awaits measuring of input moment and change the circuit that phase place and amplitude all take place the biggest change. The control signal of the switching switch is repeatedly coded and controlled, and can be switched for many times. The method has the advantages that (1) the technical requirements of primary main equipment and the grounding safety requirements do not need to be changed. In the transient process, the input time of each capacitor and resistor grounding control loop is controlled between 20 milliseconds and 100 milliseconds, so that large abrupt change of the phase and amplitude of zero-sequence current can be generated, a complete sampling waveform can be obtained, and the grounding mode can be prevented from being changed for a long time to avoid fault expansion; (2) by collecting current signals of a capacitor and a resistor which are put into a preset time, the zero sequence current is simply calculated, phase change and amplitude change are rapidly compared, and the running time is short; (3) the preset time of switching of the capacitor and the resistor can be repeatedly coded and controlled, the capacitor and the resistor can be repeatedly put on a neutral grounding circuit, and the line selection analysis can be repeatedly carried out, so that the line selection accuracy is ensured.
It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are used for distinguishing two entities with the same name but different names or different parameters, and it is understood that "first" and "second" are only used for convenience of expression and should not be understood as limitations to the embodiments of the present invention, and the following embodiments do not describe any more.
Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, is limited to these examples; within the idea of the invention, also technical features in the above embodiments or in different embodiments can be combined, steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity.
In addition, well known power/ground connections to other components may or may not be shown in the figures provided for simplicity of illustration and discussion, and so as not to obscure the invention. Furthermore, devices may be shown in block diagram form in order to avoid obscuring the invention, and also in view of the fact that specifics with respect to implementation of such block diagram devices are highly dependent upon the platform within which the present invention is to be implemented (i.e., specifics should be well within purview of one skilled in the art). Where specific details are set forth in order to describe example embodiments of the invention, it will be apparent to one skilled in the art that the invention can be practiced without, or with variation of, these specific details. Accordingly, the description is to be regarded as illustrative instead of restrictive.
While the present invention has been described in conjunction with specific embodiments thereof, many alternatives, modifications, and variations of these embodiments will be apparent to those skilled in the art in light of the foregoing description.
The present embodiments are intended to embrace all such alternatives, modifications and variances which fall within the broad scope of the appended claims. Therefore, any omission, modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (6)
1. A single-phase earth fault line selection device of a low-current grounding system is characterized by comprising:
the intelligent controller comprises an intelligent controller, a capacitor, a resistor, a switching device, a data acquisition device, a voltage transformer and a plurality of current transformers;
the voltage transformer is used for acquiring three-phase voltage signals of a bus, and the data acquisition device is connected with the voltage transformer and acquires information of the voltage transformer into the data acquisition device; the current transformers are respectively used for collecting current signals of a plurality of lines to be tested; the data acquisition device is respectively connected with the plurality of current transformers and acquires the information of the plurality of current transformers into the data acquisition device; the capacitor and the resistor are connected in parallel; the intelligent controller can control the switching device to respectively put the capacitor and the resistor into a neutral point grounding branch; the intelligent controller is connected with the data acquisition device through a data communication line.
2. The small-current grounding system single-phase ground fault line selection device as claimed in claim 1, wherein the switching device comprises a switching switch controlled by the intelligent controller, and the switching switch is connected in series with a parallel branch formed by the capacitor and the resistor to form a branch and is connected in parallel with the neutral grounding circuit.
3. The low-current grounding system single-phase ground fault line selection device as claimed in claim 2, wherein the switching switch comprises a mechanical quick switch.
4. The low current grounding system single-phase ground fault line selection apparatus of claim 1, wherein the intelligent controller comprises:
the signal receiving unit is used for receiving the three-phase voltage signals and the current signals acquired by the data acquisition device;
the signal processing unit is used for processing the three-phase voltage signals and the plurality of current signals received by the signal receiving unit, analyzing the phase variation and the amplitude variation of the zero-sequence current of the plurality of lines to be tested, and screening the line with the maximum phase variation and amplitude variation;
and the control unit is used for receiving the processing result of the signal processing unit, selecting switching time, adjusting the preset switching duration and outputting a conducting signal to the switching device.
5. The single-phase ground fault line selection device of a low-current grounding system of claim 1, wherein the capacitance value of the capacitor is larger than the capacitance value of the arc suppression coil for over compensation.
6. A small current grounding system single-phase ground fault line selection apparatus as claimed in claim 1 wherein the resistance value of said resistor is greater than the ratio of the neutral point voltage peak to the fault point current peak.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110286297A (en) * | 2019-06-12 | 2019-09-27 | 北京中电泰瑞科技有限公司 | A single-phase ground fault line selection device and method for a small current grounding system |
| CN115389860A (en) * | 2022-05-16 | 2022-11-25 | 国网四川省电力公司电力科学研究院 | Power distribution network single-phase high-resistance grounding line selection strategy based on current composite criterion |
-
2019
- 2019-06-12 CN CN201920879139.6U patent/CN210665923U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110286297A (en) * | 2019-06-12 | 2019-09-27 | 北京中电泰瑞科技有限公司 | A single-phase ground fault line selection device and method for a small current grounding system |
| CN110286297B (en) * | 2019-06-12 | 2024-10-25 | 北京中电泰瑞科技有限公司 | A single-phase grounding fault line selection device and method for a small current grounding system |
| CN115389860A (en) * | 2022-05-16 | 2022-11-25 | 国网四川省电力公司电力科学研究院 | Power distribution network single-phase high-resistance grounding line selection strategy based on current composite criterion |
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