CN110716168A - Method for detecting performance of traveling wave distance measuring device - Google Patents
Method for detecting performance of traveling wave distance measuring device Download PDFInfo
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- CN110716168A CN110716168A CN201911125135.XA CN201911125135A CN110716168A CN 110716168 A CN110716168 A CN 110716168A CN 201911125135 A CN201911125135 A CN 201911125135A CN 110716168 A CN110716168 A CN 110716168A
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Abstract
The invention discloses a method for detecting the performance of a traveling wave distance measuring device, which comprises the following steps: step one, detecting a sampling function; step two, detecting the wave recording storage function; step three, detecting time precision; step four, starting element detection; step five, detecting an alarm function; step six, detecting the distance measuring response time; and step seven, detecting the distance measuring precision. The invention provides a function detection method of a traveling wave distance measurement device, which specifically comprises detection conditions, items and methods of various functional modules, and makes up the blank of the function detection method of the conventional traveling wave distance measurement device; meanwhile, the method has practical operability and guiding significance, and the traveling wave distance measuring device with excellent selectable function and capable of meeting the operation requirement of the power grid is detected, so that the safe and stable operation of the power grid is guaranteed.
Description
Technical Field
The invention belongs to the field of relay protection of power systems, and particularly relates to a function detection method of a traveling wave distance measuring device.
Background
One of the main factors influencing the positioning efficiency of the fault point of the power transmission line is the accuracy of fault location, and the current fault location principle has two major categories, namely an impedance method and a traveling wave method, and the fault location device is provided with a protection device, a fault recording device and a traveling wave location device.
The traveling wave ranging is a device which utilizes transient current and voltage traveling wave generated during fault to determine the distance of a fault point, and a traveling wave ranging device is used for collecting and processing traveling wave signals at a plant station and providing a ranging result. The traveling wave fault component generated during line fault contains abundant fault information, the information comprises fault time, fault phase, fault line, fault phase and the like, compared with power frequency electric quantity, the traveling wave speed is high, the traveling wave fault component is not influenced by transition resistance, CT saturation and system oscillation, and the traveling wave fault component is generally applied to ultrahigh voltage transmission lines in recent years and has high industry acceptance.
Due to the wide application of the traveling wave ranging, how to select the traveling wave ranging device with excellent functions and capable of meeting the operation requirements of the power grid is also particularly basic and important. At present, research on a detection method of a traveling wave distance measuring device is not much concerned, the technical requirements of the traveling wave fault distance measuring device are given by a row label 'technical conditions of a DL/T357-2019 transmission line traveling wave fault distance measuring device', but a detailed detection method is not given to effectively guide the function detection of the traveling wave distance measuring fault device, and the type selection and the safe operation of equipment cannot be supported powerfully.
Therefore, it is desirable to provide a method for detecting performance of a traveling wave ranging apparatus to solve the above technical problems.
Disclosure of Invention
The invention aims to provide a method for detecting the performance of a traveling wave distance measuring device, which effectively guides the function detection of the traveling wave distance measuring device of alternating current and direct current transmission lines based on the traveling wave principle and makes up the blank of the function detection method of the existing traveling wave distance measuring device.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a method for detecting performance of a traveling wave distance measuring device adopts a traveling wave distance measuring tester or a moving die simulation test system, wherein the traveling wave distance measuring tester comprises a signal source which contains 3/6 channel broadband and high-speed current, and comprises the following steps:
step one, detecting a sampling function;
step two, detecting the wave recording storage function;
step three, detecting time precision;
step four, starting element detection;
step five, detecting an alarm function;
step six, detecting the distance measuring response time;
and step seven, detecting the distance measuring precision.
As a further improvement of the present invention, in the step one, the sampling function detection includes:
detecting sampling precision, namely applying corresponding current and voltage quantities to a tested device by using a traveling wave distance measuring tester, observing the display quantity of a panel of the distance measuring device, comparing the display quantity with the applied quantity value of the tester, and testing whether the measured amplitude error meets the related standard requirement under the power frequency condition; the range of the current is 0.05-20 Ie or 0.1-40 Ie, and the range of the voltage is 0.01-1.5 Ue;
detecting sampling rate, applying a test quantity to the tested device by using a traveling wave distance measuring tester, and calling a device recording file to check whether the sampling rate meets the requirements of relevant standards;
sampling consistency precision detection: the distance measuring devices at two ends are synchronized through a GPS clock, a communication network is kept to be directly connected, a traveling wave distance measuring tester is used for simultaneously applying mutation signals to the two devices, wave recording files of the two devices are checked, relative error calculation at the wave recording mutation moment is carried out, and whether the relative error meets the requirements of relevant standards is checked.
As a further improvement of the present invention, in the second step, the wave recording storage function detection includes: applying fault quantity to a tested device by using a traveling wave distance measurement tester, and calling a device recording file to check a recording waveform; and checking the length of the wave recording file of the device, the stored frequency of the fault data, the time interval between two times of recording and the format information of the wave recording file, and checking whether the requirements of relevant standards are met.
As a further improvement of the present invention, in step three, the time precision detection includes:
detecting time setting precision errors, and comparing the 1PPS signal output by the device with a standard clock source 1PPS signal; the standard clock source gives time to the device, after the device synchronizes the time stably, the time tester is utilized to measure the frequency measuring device for 1 time per second and the standard clock source respectively output the absolute value delta t of the time difference between the effective edges of the 1PPS signals, and the maximum value of the delta t measured in the testing process is the final testing result; the testing time lasts for more than 10 min, and whether the time setting error meets the requirements of relevant standards is checked;
and (3) time keeping precision error detection: the device to be tested firstly receives the time service of the standard clock source, cancels the time service of the standard clock source after the time service is stable, and the maximum value of the absolute value of the effective edge time difference between the 1PPS signal output by the device and the 1PPS of the standard clock source in the testing process is the time-keeping error in the testing time; the testing time lasts for more than 3min, and whether the punctuality error meets the requirements of relevant standards is checked.
As a further improvement of the present invention, in step four, the starting element detection process is as follows:
judging whether the starting mode of the traveling wave distance measuring device is fault component starting or switching value starting;
if the starting mode is fault component starting, applying single-phase fault, interphase fault and three-phase fault to the tested device by using a traveling wave ranging tester according to a starting element algorithm, and respectively checking whether the device can be normally started;
if the starting mode is switching value starting, the input value for starting distance measurement is applied, and whether the device can be started normally is checked.
As a further improvement of the present invention, in the fifth step, the alarm function detection includes:
detecting a power interruption alarm function, disconnecting a working power supply of the traveling wave distance measuring device, and checking whether a power interruption alarm exists or not;
detecting a communication abnormity warning function, pulling out an inter-station communication line of the traveling wave distance measuring device, and checking whether a communication abnormity warning exists;
and detecting a time synchronization abnormity warning function, pulling out the traveling wave distance measuring device to synchronize the time, and checking whether time synchronization abnormity warning exists or not.
As a further improvement of the present invention, in the sixth step, the ranging response time detection includes: and (3) testing the device by using the traveling wave distance measurement tester to apply single-phase faults, and checking whether the time of the device for outputting the distance measurement result meets the requirements of relevant standards.
As a further improvement of the present invention, in the seventh step, the detecting of the ranging accuracy includes: the distance measurement precision detection is carried out through a traveling wave distance measurement test system, and the traveling wave distance measurement test system comprises a traveling wave distance measurement tester, a time synchronization device, a device to be measured and an auxiliary PC (personal computer) and simulates an alternating current transmission line model and a direct current transmission line model.
As a further improvement of the invention, the testing steps of the traveling wave ranging testing system comprise:
step one, detecting the distance measurement precision under different fault types
1) Setting a fault initial phase angle to be 45 degrees, setting fault points at the near end, the middle point and the far end in an alternating current transmission line area, and setting fault types to be single-phase grounding, two-phase short circuit grounding and three-phase short circuit;
2) setting a fault initial phase angle to be 45 degrees, setting fault points at the near end, the middle point and the far end in a direct current transmission line area, and setting fault types to be unipolar grounding, bipolar grounding and bipolar short circuit; respectively simulating the intra-area attribute faults according to the settings, and inspecting whether the fault distance measurement result meets the requirements of relevant standards;
step two, fault location precision detection during passing through transition resistor
1) Setting a fault initial phase angle to be 45 degrees, setting fault points at the near end, the middle point and the far end in an alternating current transmission line area, and setting fault types to be single-phase grounding through a transition resistor and two-phase short-circuit grounding through an arc light resistor;
2) setting a fault initial phase angle to be 45 degrees, setting fault points at the near end, the middle point and the far end in a direct current transmission line area, and setting fault types to be that a single pole is grounded through a transition resistor and a double pole is short-circuited through an arc light resistor;
the transition resistance of the single-phase line grounded through the transition resistance and the single-pole grounded through the transition resistance is set according to the voltage class, specifically, the transition resistance of a direct-current line is not more than 300 omega, the transition resistance of an alternating-current line of 750kV and above is not more than 400 omega, the transition resistance of a 500kV alternating-current line is not more than 300 omega, the transition resistance of a 330kV alternating-current line is not more than 150 omega, and the transition resistance of an alternating-current line of 110kV and 220kV is not more than; respectively simulating the transition resistance fault in the area according to the settings, and inspecting whether the fault distance measurement result meets the requirements of relevant standards;
step three: detecting fault location precision at different fault initial phase angles, wherein the fault initial phase angles are respectively set to be 20 degrees, 60 degrees and 90 degrees, fault points are arranged at the near end, the middle point and the far end in the alternating current transmission line area, and the fault types are set to be single-phase metallic grounding and two-phase metallic short circuit; simulating the intra-zone attribute faults at different fault initial phase angles respectively according to the setting, and inspecting whether the fault distance measurement result meets the relevant standard requirements;
detecting the distance measurement precision under the frequency deviation working condition, setting the system operating frequency to be 48Hz and 52Hz respectively, setting fault points to be at the near end, the middle point and the far end in the AC transmission line area, and setting the fault types to be metallic single-phase grounding, two-phase short circuit grounding, two-phase interphase short circuit and three-phase short circuit fault; and respectively simulating the intra-area attribute faults under the frequency deviation working condition according to the setting, and inspecting whether the fault distance measurement result meets the requirements of relevant standards.
Step five, fault location precision detection under different bus types
1) Setting the interval number of incoming lines and outgoing lines of a bus to be 2, setting the initial fault phase angle to be 45 degrees, setting fault points to be at the near end, the middle point and the far end in an alternating current transmission line area, and setting the fault types to be metallic single-phase grounding, two-phase short circuit grounding, two-phase interphase short circuit and three-phase short circuit fault;
2) the interval number of incoming lines and outgoing lines of the bus is set to be 6, the initial fault phase angle is set to be 45 degrees, fault points are arranged at the near end, the middle point and the far end in the alternating current transmission line area, and the fault types are set to be metallic single-phase grounding, two-phase short circuit grounding, two-phase interphase short circuit and three-phase short circuit faults. And respectively simulating various metal instantaneous faults in the area according to the setting, and inspecting whether the fault distance measurement result meets the requirements of relevant standards.
Specifically, the relevant standard requirements are the regulations in the GB/T7261-2016 relay protection and safety automatic device basic test method.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a function detection method of a traveling wave distance measurement device, which specifically comprises detection conditions, items and methods of various functional modules, and makes up the blank of the function detection method of the conventional traveling wave distance measurement device; meanwhile, the method has practical operability and guiding significance, and the traveling wave distance measuring device with excellent selectable function and capable of meeting the operation requirement of the power grid is detected, so that the safe and stable operation of the power grid is guaranteed.
Drawings
FIG. 1 is a wiring diagram of a sampling consistency precision test;
FIG. 2 is a wiring diagram for testing time setting error;
FIG. 3 is a flow chart of a startup element testing process;
FIG. 4 is a wiring diagram of a test for testing accuracy.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the application, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
In the description of the present application, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience of description and simplicity of description only, and in the case of not making a reverse description, these directional terms do not indicate and imply that the device or element being referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore, should not be considered as limiting the scope of the present application; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.
Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of protection of the present application is not to be construed as being limited.
The invention aims to solve the problem of identifying the topological relation of electric equipment in a power grid area by the existing collected data, a characteristic gradient matching algorithm and a time-interval frozen electric quantity accumulation and matching algorithm.
A method for detecting the performance of a traveling wave distance measuring device comprises the following steps:
step one, detecting a sampling function;
step two, detecting the wave recording storage function;
step three, detecting time precision;
step four, starting element detection;
step five, detecting an alarm function;
step six, detecting the distance measuring response time;
and step seven, detecting the distance measuring precision.
Wherein, the detection device adopts a traveling wave distance measurement tester or uses a moving die simulation test system, wherein the traveling wave distance measurement tester should have a broadband and high-speed current signal source which contains 3/6 channels, can completely and high-quality terrain present fault signal formers have the function of applying fault signals with the characteristics of transient traveling wave heads, the instruments and meters used for monitoring must be qualified through inspection,
as shown in fig. 1, in the first step, the sampling function detection includes:
detecting sampling precision, namely applying corresponding current and voltage quantities to a tested device by using a traveling wave distance measuring tester, observing the display quantity of a panel of the distance measuring device, comparing the display quantity with the applied quantity value of the tester, and testing whether the measured amplitude error meets the related standard requirement under the power frequency condition; the range of the current is 0.05-20 Ie or 0.1-40 Ie, and the range of the voltage is 0.01-1.5 Ue;
detecting sampling rate, applying a test quantity to the tested device by using a traveling wave distance measuring tester, and calling a device recording file to check whether the sampling rate meets the requirements of relevant standards;
sampling consistency precision detection: the distance measuring devices at two ends are synchronized through a GPS clock, a communication network is kept to be directly connected, a traveling wave distance measuring tester is used for simultaneously applying mutation signals to the two devices, wave recording files of the two devices are checked, relative error calculation at the wave recording mutation moment is carried out, and whether the relative error meets the requirements of relevant standards is checked.
As a further improvement of the present invention, in the second step, the wave recording storage function detection includes: applying fault quantity to a tested device by using a traveling wave distance measurement tester, and calling a device recording file to check a recording waveform; and checking the length of the wave recording file of the device, the stored frequency of the fault data, the time interval between two times of recording and the format information of the wave recording file, and checking whether the requirements of relevant standards are met.
As shown in fig. 2, in the third step, the time precision detection includes:
detecting time setting precision errors, and comparing the 1PPS signal output by the device with a standard clock source 1PPS signal; the standard clock source gives time to the device, after the device synchronizes the time stably, the time tester is utilized to measure the frequency measuring device for 1 time per second and the standard clock source respectively output the absolute value delta t of the time difference between the effective edges of the 1PPS signals, and the maximum value of the delta t measured in the testing process is the final testing result; the testing time lasts for more than 10 min, and whether the time setting error meets the requirements of relevant standards is checked;
and (3) time keeping precision error detection: the device to be tested firstly receives the time service of the standard clock source, cancels the time service of the standard clock source after the time service is stable, and the maximum value of the absolute value of the effective edge time difference between the 1PPS signal output by the device and the 1PPS of the standard clock source in the testing process is the time-keeping error in the testing time; the testing time lasts for more than 3min, and whether the punctuality error meets the requirements of relevant standards is checked.
As shown in fig. 3, in the fourth step, the starting element detection process is as follows:
judging whether the starting mode of the traveling wave distance measuring device is fault component starting or switching value starting;
if the starting mode is fault component starting, applying single-phase fault, interphase fault and three-phase fault to the tested device by using a traveling wave ranging tester according to a starting element algorithm, and respectively checking whether the device can be normally started;
if the starting mode is switching value starting, the input value for starting distance measurement is applied, and whether the device can be started normally is checked.
As a further improvement of the present invention, in the fifth step, the alarm function detection includes:
detecting a power interruption alarm function, disconnecting a working power supply of the traveling wave distance measuring device, and checking whether a power interruption alarm exists or not;
detecting a communication abnormity warning function, pulling out an inter-station communication line of the traveling wave distance measuring device, and checking whether a communication abnormity warning exists;
and detecting a time synchronization abnormity warning function, pulling out the traveling wave distance measuring device to synchronize the time, and checking whether time synchronization abnormity warning exists or not.
As a further improvement of the present invention, in the sixth step, as shown in fig. 1, the connection is performed, and the ranging response time detection includes: and (3) testing the device by using the traveling wave distance measurement tester to apply single-phase faults, and checking whether the time of the device for outputting the distance measurement result meets the requirements of relevant standards.
As shown in fig. 4, in the seventh step, the range-finding precision detection includes: the distance measurement precision detection is carried out through a traveling wave distance measurement test system, and the traveling wave distance measurement test system comprises a traveling wave distance measurement tester, a time synchronization device, a device to be measured and an auxiliary PC (personal computer) and simulates an alternating current transmission line model and a direct current transmission line model.
As a further improvement of the invention, the testing steps of the traveling wave ranging testing system comprise:
step one, detecting the distance measurement precision under different fault types
1) Setting a fault initial phase angle to be 45 degrees, setting fault points at the near end, the middle point and the far end in an alternating current transmission line area, and setting fault types to be single-phase grounding, two-phase short circuit grounding and three-phase short circuit;
2) setting a fault initial phase angle to be 45 degrees, setting fault points at the near end, the middle point and the far end in a direct current transmission line area, and setting fault types to be unipolar grounding, bipolar grounding and bipolar short circuit; respectively simulating the intra-area attribute faults according to the settings, and inspecting whether the fault distance measurement result meets the requirements of relevant standards;
step two, fault location precision detection during passing through transition resistor
1) Setting a fault initial phase angle to be 45 degrees, setting fault points at the near end, the middle point and the far end in an alternating current transmission line area, and setting fault types to be single-phase grounding through a transition resistor and two-phase short-circuit grounding through an arc light resistor;
2) setting a fault initial phase angle to be 45 degrees, setting fault points at the near end, the middle point and the far end in a direct current transmission line area, and setting fault types to be that a single pole is grounded through a transition resistor and a double pole is short-circuited through an arc light resistor;
the transition resistance of the single-phase line grounded through the transition resistance and the single-pole grounded through the transition resistance is set according to the voltage class, specifically, the transition resistance of a direct-current line is not more than 300 omega, the transition resistance of an alternating-current line of 750kV and above is not more than 400 omega, the transition resistance of a 500kV alternating-current line is not more than 300 omega, the transition resistance of a 330kV alternating-current line is not more than 150 omega, and the transition resistance of an alternating-current line of 110kV and 220kV is not more than; respectively simulating the transition resistance fault in the area according to the settings, and inspecting whether the fault distance measurement result meets the requirements of relevant standards;
step three: detecting fault location precision at different fault initial phase angles, wherein the fault initial phase angles are respectively set to be 20 degrees, 60 degrees and 90 degrees, fault points are arranged at the near end, the middle point and the far end in the alternating current transmission line area, and the fault types are set to be single-phase metallic grounding and two-phase metallic short circuit; simulating the intra-zone attribute faults at different fault initial phase angles respectively according to the setting, and inspecting whether the fault distance measurement result meets the relevant standard requirements;
detecting the distance measurement precision under the frequency deviation working condition, setting the system operating frequency to be 48Hz and 52Hz respectively, setting fault points to be at the near end, the middle point and the far end in the AC transmission line area, and setting the fault types to be metallic single-phase grounding, two-phase short circuit grounding, two-phase interphase short circuit and three-phase short circuit fault; and respectively simulating the intra-area attribute faults under the frequency deviation working condition according to the setting, and inspecting whether the fault distance measurement result meets the requirements of relevant standards.
Step five, fault location precision detection under different bus types
1) Setting the interval number of incoming lines and outgoing lines of a bus to be 2, setting the initial fault phase angle to be 45 degrees, setting fault points to be at the near end, the middle point and the far end in an alternating current transmission line area, and setting the fault types to be metallic single-phase grounding, two-phase short circuit grounding, two-phase interphase short circuit and three-phase short circuit fault;
2) the interval number of incoming lines and outgoing lines of the bus is set to be 6, the initial fault phase angle is set to be 45 degrees, fault points are arranged at the near end, the middle point and the far end in the alternating current transmission line area, and the fault types are set to be metallic single-phase grounding, two-phase short circuit grounding, two-phase interphase short circuit and three-phase short circuit faults. And respectively simulating various metal instantaneous faults in the area according to the setting, and inspecting whether the fault distance measurement result meets the requirements of relevant standards.
Specifically, the relevant standard requirements are the regulations in the GB/T7261-2016 relay protection and safety automatic device basic test method.
The method has practical operability and guiding significance, and can select the traveling wave distance measuring device with excellent function and capable of meeting the operation requirement of the power grid through detection, so that the safe and stable operation of the power grid is guaranteed.
The foregoing examples, while indicating preferred embodiments of the invention, are given by way of illustration and description, but are not intended to limit the invention solely thereto; it is specifically noted that those skilled in the art or others will be able to make local modifications within the system and to make modifications, changes, etc. between subsystems without departing from the structure of the present invention, and all such modifications, changes, etc. fall within the scope of the present invention.
Claims (10)
1. A method for detecting performance of a traveling wave distance measuring device adopts a traveling wave distance measuring tester or a moving die simulation test system, wherein the traveling wave distance measuring tester comprises a signal source which contains 3/6 channel broadband and high-speed current, and is characterized by comprising the following steps:
step one, detecting a sampling function;
step two, detecting the wave recording storage function;
step three, detecting time precision;
step four, starting element detection;
step five, detecting an alarm function;
step six, detecting the distance measuring response time;
and step seven, detecting the distance measuring precision.
2. The method for detecting the performance of a traveling wave ranging device according to claim 1, wherein in the first step, the detecting of the sampling function comprises:
detecting sampling precision, namely applying corresponding current and voltage quantities to a tested device by using a traveling wave distance measuring tester, observing the display quantity of a panel of the distance measuring device, comparing the display quantity with the applied quantity value of the tester, and testing whether the measured amplitude error meets the related standard requirement under the power frequency condition; the range of the current is 0.05-20 Ie or 0.1-40 Ie, and the range of the voltage is 0.01-1.5 Ue;
detecting sampling rate, applying a test quantity to the tested device by using a traveling wave distance measuring tester, and calling a device recording file to check whether the sampling rate meets the requirements of relevant standards;
sampling consistency precision detection: the distance measuring devices at two ends are synchronized through a GPS clock, a communication network is kept to be directly connected, a traveling wave distance measuring tester is used for simultaneously applying mutation signals to the two devices, wave recording files of the two devices are checked, relative error calculation at the wave recording mutation moment is carried out, and whether the relative error meets the requirements of relevant standards is checked.
3. The method for detecting the performance of a traveling wave ranging device according to claim 1, wherein in the second step, the detection of the wave recording storage function comprises: applying fault quantity to a tested device by using a traveling wave distance measurement tester, and calling a device recording file to check a recording waveform; and checking the length of the wave recording file of the device, the stored frequency of the fault data, the time interval between two times of recording and the format information of the wave recording file, and checking whether the requirements of relevant standards are met.
4. The method of claim 1, wherein in step three, the time-based accuracy detection comprises:
detecting time setting precision errors, and comparing the 1PPS signal output by the device with a standard clock source 1PPS signal; the standard clock source gives time to the device, after the device synchronizes the time stably, the time tester is utilized to measure the frequency measuring device for 1 time per second and the standard clock source respectively output the absolute value delta t of the time difference between the effective edges of the 1PPS signals, and the maximum value of the delta t measured in the testing process is the final testing result; the testing time lasts for more than 10 min, and whether the time setting error meets the requirements of relevant standards is checked;
and (3) time keeping precision error detection: the device to be tested firstly receives the time service of the standard clock source, cancels the time service of the standard clock source after the time service is stable, and the maximum value of the absolute value of the effective edge time difference between the 1PPS signal output by the device and the 1PPS of the standard clock source in the testing process is the time-keeping error in the testing time; the testing time lasts for more than 3min, and whether the punctuality error meets the requirements of relevant standards is checked.
5. The method for detecting the performance of a traveling-wave ranging device according to claim 1, wherein in the fourth step, the element detection process is started as follows:
judging whether the starting mode of the traveling wave distance measuring device is fault component starting or switching value starting;
if the starting mode is fault component starting, applying single-phase fault, interphase fault and three-phase fault to the tested device by using a traveling wave ranging tester according to a starting element algorithm, and respectively checking whether the device can be normally started;
if the starting mode is switching value starting, the input value for starting distance measurement is applied, and whether the device can be started normally is checked.
6. The method for detecting the performance of a traveling wave ranging device according to claim 1, wherein in the step five, the detecting the alarm function comprises:
detecting a power interruption alarm function, disconnecting a working power supply of the traveling wave distance measuring device, and checking whether a power interruption alarm exists or not;
detecting a communication abnormity warning function, pulling out an inter-station communication line of the traveling wave distance measuring device, and checking whether a communication abnormity warning exists;
and detecting a time synchronization abnormity warning function, pulling out the traveling wave distance measuring device to synchronize the time, and checking whether time synchronization abnormity warning exists or not.
7. The method for detecting the performance of a traveling wave ranging device according to claim 1, wherein in the sixth step, the detection of the ranging response time comprises: and (3) testing the device by using the traveling wave distance measurement tester to apply single-phase faults, and checking whether the time of the device for outputting the distance measurement result meets the requirements of relevant standards.
8. The method for detecting the performance of a traveling wave ranging device according to claim 1, wherein in the seventh step, the detection of the ranging accuracy comprises: the distance measurement precision detection is carried out through a traveling wave distance measurement test system, and the traveling wave distance measurement test system comprises a traveling wave distance measurement tester, a time synchronization device, a device to be measured and an auxiliary PC (personal computer) and simulates an alternating current transmission line model and a direct current transmission line model.
9. The method of claim 8, wherein the step of testing the traveling wave ranging test system comprises:
step one, detecting the distance measurement precision under different fault types
1) Setting a fault initial phase angle to be 45 degrees, setting fault points at the near end, the middle point and the far end in an alternating current transmission line area, and setting fault types to be single-phase grounding, two-phase short circuit grounding and three-phase short circuit;
2) setting a fault initial phase angle to be 45 degrees, setting fault points at the near end, the middle point and the far end in a direct current transmission line area, and setting fault types to be unipolar grounding, bipolar grounding and bipolar short circuit; respectively simulating the intra-area attribute faults according to the settings, and inspecting whether the fault distance measurement result meets the requirements of relevant standards;
step two, fault location precision detection during passing through transition resistor
1) Setting a fault initial phase angle to be 45 degrees, setting fault points at the near end, the middle point and the far end in an alternating current transmission line area, and setting fault types to be single-phase grounding through a transition resistor and two-phase short-circuit grounding through an arc light resistor;
2) setting a fault initial phase angle to be 45 degrees, setting fault points at the near end, the middle point and the far end in a direct current transmission line area, and setting fault types to be that a single pole is grounded through a transition resistor and a double pole is short-circuited through an arc light resistor;
the transition resistance of the single-phase line grounded through the transition resistance and the single-pole grounded through the transition resistance is set according to the voltage class, specifically, the transition resistance of a direct-current line is not more than 300 omega, the transition resistance of an alternating-current line of 750kV and above is not more than 400 omega, the transition resistance of a 500kV alternating-current line is not more than 300 omega, the transition resistance of a 330kV alternating-current line is not more than 150 omega, and the transition resistance of an alternating-current line of 110kV and 220kV is not more than; respectively simulating the transition resistance fault in the area according to the settings, and inspecting whether the fault distance measurement result meets the requirements of relevant standards;
step three: detecting fault location precision at different fault initial phase angles, wherein the fault initial phase angles are respectively set to be 20 degrees, 60 degrees and 90 degrees, fault points are arranged at the near end, the middle point and the far end in the alternating current transmission line area, and the fault types are set to be single-phase metallic grounding and two-phase metallic short circuit; simulating the intra-zone attribute faults at different fault initial phase angles respectively according to the setting, and inspecting whether the fault distance measurement result meets the relevant standard requirements;
detecting the distance measurement precision under the frequency deviation working condition, setting the system operating frequency to be 48Hz and 52Hz respectively, setting fault points to be at the near end, the middle point and the far end in the AC transmission line area, and setting the fault types to be metallic single-phase grounding, two-phase short circuit grounding, two-phase interphase short circuit and three-phase short circuit fault; respectively simulating the intra-area attribute faults under the frequency deviation working condition according to the settings, and inspecting whether the fault distance measurement result meets the requirements of relevant standards;
step five, fault location precision detection under different bus types
1) Setting the interval number of incoming lines and outgoing lines of a bus to be 2, setting the initial fault phase angle to be 45 degrees, setting fault points to be at the near end, the middle point and the far end in an alternating current transmission line area, and setting the fault types to be metallic single-phase grounding, two-phase short circuit grounding, two-phase interphase short circuit and three-phase short circuit fault;
2) setting the interval number of incoming lines and outgoing lines of a bus to be 6, setting the initial fault phase angle to be 45 degrees, setting fault points to be at the near end, the middle point and the far end in an alternating current transmission line area, and setting the fault types to be metallic single-phase grounding, two-phase short circuit grounding, two-phase interphase short circuit and three-phase short circuit fault;
and respectively simulating various metal instantaneous faults in the area according to the setting, and inspecting whether the fault distance measurement result meets the requirements of relevant standards.
10. The method for detecting the performance of a traveling wave distance measuring device according to claims 2, 3, 4, 7 or 9, wherein the relevant standard requirements are the requirements of GB/T7261-one 2016 relay protection and basic test method of safety automatic devices.
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