CN112834868A - Non-contact detection method for wire power-off event - Google Patents
Non-contact detection method for wire power-off event Download PDFInfo
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- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention discloses a non-contact detection method for a wire power-off event, which is used for detecting and analyzing the downstream power-off of a medium-low voltage line; low-cost and efficient non-contact power-off event detection can be achieved. The invention comprises the following steps: (1) sampling current I and voltage V of a wire; (2) according to the sampled current I and voltage V and three successive periods of time T0、T1、T2To obtain T0State S of the time interval conductor; (3) calculating to obtain T1、T2Average voltage V corresponding to two consecutive periods_T1、V_T2And average current I_T1、I_T2From calculated T1、T2Average voltage V corresponding to two consecutive periods_T1、V_T2And average current I_T1、I_T2Judgment ofAnd if the average voltage and the average current are reduced greatly and the wire is in a power-on state, judging that a wire voltage loss event occurs and the state S of the juxtaposed wires is in a power-off state.
Description
Technical Field
The invention relates to a wire power-off monitoring technology, which is particularly used for accurately judging a power-off event of a medium-low voltage line.
Background
The operation of the power grid can be roughly divided into the following steps from grid structure and voltage level: the main network and the distribution network, wherein the distribution network is roughly divided into a medium-voltage distribution network (10kV) and a low-voltage distribution network (380V). Compared with the main network, the medium-voltage distribution network has larger equipment quantity, dispersed equipment operation environment and severe operation environment, which brings the problems of huge infrastructure cost of distribution network automation, insufficient coverage, difficult bearing of communication and system operation and maintenance cost and the like, and seriously restricts the construction and popularization of a distribution network scheduling system; for the low-voltage distribution network, due to the reasons of more and more complex structure, numerous equipment, low automation level and the like, the low-voltage distribution network is a blind area for management, and because of the lack of a low-voltage monitoring means, the power failure of a low-voltage distribution area cannot be sensed in time, the fault recovery time is prolonged, and the improvement of the customer service level is influenced.
The current market does not have equipment specially aiming at detecting the power failure of a medium-voltage distribution network line, a capacitance type voltage sensor is arranged in a recording type fault indicator of the latest version at present, whether a detected lead is electrified or not can be judged theoretically by detecting the numerical value of the phase electric field intensity, but the related technical standard does not impose technical requirements on the detection; the common technical means for detecting the power failure of the low-voltage line (such as the low-voltage side of the transformer area) is to install a distribution transformer terminal on the low-voltage side of the transformer area and upload power failure signals of the low-voltage side of the transformer area to a background main station in a wireless or wired mode.
The above methods all have great defects, and the method of directly judging whether the detected lead is electrified or not by detecting the numerical value of the phase electric field strength is very easy to be interfered by an adjacent stray electric field, and cannot set a fixed value; on the other hand, the detection devices such as distribution transformer terminals and the like are installed on the low-voltage side of the transformer area, and belong to invasive devices, so that the installation is inconvenient, the installation needs to be stopped, and the investment cost is high, and the large-area installation is difficult.
The method disclosed by the invention can overcome the defects. The device has the advantages of being capable of achieving extremely high power-off inspection accuracy, being suitable for large-area installation and commissioning and being convenient to install and detach due to the fact that low cost can be achieved.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a non-contact detection method for a wire power-off event, aiming at the defects in the prior art, which is used for downstream power-off detection analysis of medium and low voltage lines (including branch lines and low voltage sides of a platform area); low-cost and efficient non-contact power-off event detection can be achieved.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
the non-contact detection method for the power-off event of the lead comprises the following steps:
(1) sampling current I and voltage V of a wire;
(2) according to the sampled current I and voltage V and three successive periods of time T0、T1、T2To obtain T0State S of the time interval conductor; the state S is an electrified state or an electroless state;
(3) calculating to obtain T1、T2Average voltage V corresponding to two consecutive periods_T1、V_T2And average current I_T1、I_T2From calculated T1、T2Average voltage V corresponding to two consecutive periods_T1、V_T2And average current I_T1、I_T2Judging whether the conditions that the average voltage and the average current are greatly reduced and the lead is in a power-on state occur at the same time or not, if so, judging that a lead voltage loss event occurs, and the state S of the juxtaposed lead is in a power-off state, wherein the lead voltage loss event is a power failure event;
according to the calculated T1、T2Average voltage V corresponding to two consecutive periods_T1、V_T2And average current I_T1、I_T2And judging whether the conditions that the average voltage and the average current are greatly increased and the wire is in a non-power state occur at the same time, if so, judging that a wire power supply recovery event occurs, wherein the state S of the juxtaposed wire is in a power state, and the wire power supply recovery event is a power-on event.
As a preferred embodiment of the present invention: in the step (3), T is calculated by the following steps1、T2Average voltage V corresponding to two consecutive periods_T1、V_T2：
According to the sampled voltage value V, the root mean square value V of the voltage t in each period is calculated by the following steps_rms：
V is a voltage sampling value, N is the number of sampling values t in each period, and the period t is the time for completing one cycle change of the sine alternating current;
according to the calculated root mean square value V of the t voltage per period_rmsCalculating to obtain T according to the following formula1、T2Average voltage V corresponding to two consecutive periods_T1、V_T2：
Wherein M is T1Or T2The number of cycles in the period.
As a preferred embodiment of the present invention: in the step (3), T is calculated by the following steps1、T2Average current I for two successive periods_T1、I_T2：
According to the sampled current value I, the root mean square value I of the current per period t is calculated by the following steps_rms：
Wherein I is a current sampling value, N is the number of sampling values t in each period, and the period t is the time for completing one cycle change of the sine alternating current;
according to the calculated root mean square value I of t current per period_rmsT is calculated according to the following formula1、T2Average current I for two successive periods_T1、I_T2：
Wherein M is T1Or T2The number of cycles in the period.
As a preferred embodiment of the present invention: the step (3) is to calculate the T1、T2Average voltage V corresponding to two consecutive periods_T1、V_T2And average current I_T1、I_T2Judging whether the average voltage and the average current are greatly reduced and the wire is in a power-on state at the same time, if so, judging that a wire voltage loss event occurs, and judging whether the state S of the juxtaposed wire is in a power-off state and meets the following requirements:
the state S of the wire is a powered state,
and is
{(V_T1-V_T2)>0 and (V)_T1-V_T2)/V_T1×100％>First threshold value }
And is
{(I_T1-I_T2)>0 and (I)_T1-I_T2)/I_T1×100％>Second threshold value }
If yes, judging that a lead voltage loss event occurs, and enabling the state S of the juxtaposed leads to be a non-electricity state;
the value range of the first threshold is 30-50%;
the value range of the second threshold is 50% -75%.
As a preferred embodiment of the present invention: the step (3) is to calculate the T1、T2Average voltage V corresponding to two consecutive periods_T1、V_T2And average current I_T1、I_T2Judging whether the conditions that the average voltage and the average current are greatly increased and the wire is in a non-electricity state occur at the same time, if so, judging that a wire power recovery event occurs, and judging whether the state S of the juxtaposed wire is in an electricity state or not:
the state S of the conductive line is a non-electrical state,
and is
{(V_T1-V_T2)<0 andand (V)_T2-V_T1)/V_T2×100％>First threshold value }
And is
{(I_T1-I_T2)<0 and (I)_T2-I_T1)/I_T2×100％>Second threshold value }
If so, judging that a power supply recovery event (power-on event) of the lead occurs, and setting the state S of the juxtaposed lead to be a power-on state;
the value range of the first threshold is 30-50%;
the value range of the second threshold is 50% -75%.
As a preferred embodiment of the present invention:
the device also comprises a monitoring component for sampling the voltage and the current of the lead, wherein the monitoring component is arranged on the medium-low voltage circuit;
a remote communication module is arranged in the monitoring assembly, and uploads a wire power-on stopping signal to a background main station;
the monitoring assembly is internally provided with a capacitance voltage sensor for detecting the change condition of the electric field intensity of the line in real time, and the monitoring assembly is internally provided with a current sensor for detecting the load current of the line in real time.
The invention has the beneficial effects that:
(1) the detection accuracy is high: the invention judges the power-off event by simultaneously comparing the short-time change of the voltage and the current, has extremely high detection accuracy in practice and very wide application range;
(2) the installation is convenient and fast: the implementation process of the invention can adopt a non-contact installation mode, can be installed in a charged way, and is convenient and quick to install;
(3) high cost performance: the method adopted by the invention has low cost and quick effect, and is suitable for popularization and application.
Drawings
FIG. 1 is a schematic diagram illustrating a power outage event determination according to the present invention;
FIG. 2 is a schematic diagram illustrating a power-on event determination according to the present invention.
Detailed Description
The following description of the embodiments of the present invention refers to the accompanying drawings and examples:
as shown in fig. 1-2, which illustrate a specific embodiment of the present invention, as shown in fig. 1-2, the method for non-contact detection of a wire power-off event disclosed in the present invention comprises the following steps:
(1) sampling current I and voltage V of a wire;
(2) according to the sampled current I and voltage V and three successive periods of time T0、T1、T2To obtain T0State S of the time interval conductor; the state S is an electrified state or an electroless state;
(3) calculating to obtain T1、T2Average voltage V corresponding to two consecutive periods_T1、V_T2And average current I_T1、I_T2From calculated T1、T2Average voltage V corresponding to two consecutive periods_T1、V_T2And average current I_T1、I_T2Judging whether the conditions that the average voltage and the average current are greatly reduced and the lead is in a power-on state occur at the same time or not, if so, judging that a lead voltage loss event occurs, and the state S of the juxtaposed lead is in a power-off state, wherein the lead voltage loss event is a power failure event;
according to the calculated T1、T2Average voltage V corresponding to two consecutive periods_T1、V_T2And average current I_T1、I_T2And judging whether the conditions that the average voltage and the average current are greatly increased and the wire is in a non-power state occur at the same time, if so, judging that a wire power supply recovery event occurs, wherein the state S of the juxtaposed wire is in a power state, and the wire power supply recovery event is a power-on event.
Preferably, as shown in the figure: in the step (3), T is calculated by the following steps1、T2Average voltage V corresponding to two consecutive periods_T1、V_T2：
According to the sampled voltage value V, the root mean square value V of the voltage t in each period is calculated by the following steps_rms：
V is a voltage sampling value, N is the number of sampling values t in each period, and the period t is the time for completing one cycle change of the sine alternating current;
according to the calculated root mean square value V of the t voltage per period_rmsCalculating to obtain T according to the following formula1、T2Average voltage V corresponding to two consecutive periods_T1、V_T2：
Wherein M is T1Or T2The number of cycles in the period.
Preferably, as shown in the figure: in the step (3), T is calculated by the following steps1、T2Average current I for two successive periods_T1、I_T2：
According to the sampled current value I, the root mean square value I of the current per period t is calculated by the following steps_rms：
Wherein I is a current sampling value, N is the number of sampling values t in each period, and the period t is the time for completing one cycle change of the sine alternating current;
according to the calculated root mean square value I of t current per period_rmsT is calculated according to the following formula1、T2Average current I for two successive periods_T1、I_T2：
Wherein M is T1Or T2The number of cycles in the period.
Preferably, as shown in the figure: the step (3) is to obtain T according to calculation1、T2Average voltage V corresponding to two consecutive periods_T1、V_T2And average current I_T1、I_T2Judging whether the average voltage and the average current are greatly reduced and the wire is in a power-on state at the same time, if so, judging that a wire voltage loss event occurs, and judging whether the state S of the juxtaposed wire is in a power-off state and meets the following requirements:
the state S of the wire is a powered state,
and is
{(V_T1-V_T2)>0 and (V)_T1-V_T2)/V_T1×100％>First threshold value }
And is
{(I_T1-I_T2)>0 and (I)_T1-I_T2)/I_T1×100％>Second threshold value }
If yes, judging that a lead voltage loss event occurs, and enabling the state S of the juxtaposed leads to be a non-electricity state;
the value range of the first threshold is 30-50%;
the value range of the second threshold is 50% -75%.
Preferably, as shown in the figure: according to the calculated T1、T2Average voltage V corresponding to two consecutive periods_T1、V_T2And average current I_T1、I_T2Judging whether the conditions that the average voltage and the average current are greatly increased and the conducting wire is in a non-electricity state occur simultaneously, if so, judging that the event of recovering power supply of the conducting wire occurs, and juxtaposing the state S of the conducting wireAnd judging whether the following conditions are met or not for the power-on state:
the state S of the conductive line is a non-electrical state,
and is
{(V_T1-V_T2)<0 and (V)_T2-V_T1)/V_T2×100％>First threshold value }
And is
{(I_T1-I_T2)<0 and (I)_T2-I_T1)/I_T2×100％>Second threshold value }
If so, judging that a power supply recovery event (power-on event) of the lead occurs, and setting the state S of the juxtaposed lead to be a power-on state;
the value range of the first threshold is 30-50%;
the value range of the second threshold is 50% -75%.
Preferably, as shown in the figure:
the device also comprises a monitoring component for sampling the voltage and the current of the lead, wherein the monitoring component is arranged on the medium-low voltage circuit;
a remote communication module is arranged in the monitoring assembly, and uploads a wire power-on stopping signal to a background main station;
the monitoring assembly is internally provided with a capacitance voltage sensor for detecting the change condition of the electric field intensity of the line in real time, and the monitoring assembly is internally provided with a current sensor for detecting the load current of the line in real time.
In the embodiment of the invention, a plurality of monitoring devices are preferably arranged on a certain phase (such as phase A) or low-voltage branch lines of a plurality of transformer low-voltage side main outgoing lines, the monitoring devices can be internally provided with remote communication modules, and power-on stop signals of a transformer area low-voltage side can be timely uploaded to a background main station supporting main station to realize real-time state perception of the power distribution network.
The monitoring device is internally provided with a capacitance voltage sensor for detecting the change condition of the electric field intensity of the line in real time, and the monitoring device is internally provided with a current sensor for detecting the load current condition of the line in real time. The monitoring device judges whether the line has power failure or power restoration (power up) according to the condition that whether the average voltage and the average current are greatly increased or reduced or not at the same time:
(1) according to the calculated T1、T2Average voltage V corresponding to two consecutive periods_T1、V_T2And average current I_T1、I_T2Judging whether the conditions that the average voltage and the average current are greatly reduced and the lead is in a power-on state occur at the same time, if so, judging that a lead voltage loss event (power failure event) occurs, and judging that the state S of the juxtaposed lead is in a power-off state;
(2) according to the calculated T1、T2Average voltage V corresponding to two consecutive periods_T1、V_T2And average current I_T1、I_T2And judging whether the conditions that the average voltage and the average current are greatly increased and the lead is in a non-power state occur at the same time, if so, judging that a power supply recovery event (power-on event) of the lead occurs, and judging that the state S of the juxtaposed lead is in a power-on state.
In addition:
(3) about three successive periods T0、T1、T2: in the present embodiment, the three consecutive periods T0、T1、T2All of which are 1 second, practically 1-3 seconds are feasible, and in the present embodiment, each continuous period is composed of 50 continuous cycles, where the cycle, also called cycle, refers to the time taken for a sinusoidal alternating current with a frequency of 50Hz to complete one cycle change.
(4) With respect to the first threshold: based on practical experience, the first threshold value ranges from 30% to 50%.
(5) With respect to the second threshold: based on practical experience, the second threshold value ranges from 50% to 75%.
It should be noted that the sampling of the current and voltage of the wire according to the present invention is preferably a non-contact or existing reliable sampling structure; specifically, reference may be made to a voltage testing apparatus disclosed in a patent document in the related art (patent No. ZL2005800020447, patent publication No. CN100442060C, publication date 2008, 12 months and 10 days).
Regarding the power distribution network, especially the perception construction of the power distribution network in the BCDE area of a vast range, if the relevant application scene is practical to achieve production, the scale of perception must be large enough, and in addition, the perception means for the power distribution network in the BCDE area does not need to be particularly complex, and the sensing device can be timely acquired whether the line is electrified or not to bring huge application value, so the following requirements are necessarily provided for the sensing device: the invention has low cost, convenient assembly and disassembly and wide environment adaptation range, and is mainly provided according to the requirements; the detection technology of the alternating current is mature, and is not explained more than once; the detection of the alternating voltage generally adopts a contact type (for example, devices such as an FTU (field programmable Unit), a DTU (digital transmission Unit) or a TTU (time to Unit) of a substation adopt similar technical schemes), and a voltage signal of the alternating voltage directly enters a detection loop; the invention provides a non-contact type detection method for alternating voltage (for example, patent CN200580002044.7 discloses a non-contact type alternating voltage measuring device), which is convenient to install and disassemble and low in cost by using a built-in capacitive voltage sensor, but the defects of the method are obvious (the method of directly judging whether a measured lead is electrified by detecting the value of the phase electric field strength is very easy to be interfered by an adjacent stray electric field, and cannot set a fixed value, and in addition, the capacitive voltage sensor is very sensitive to environmental temperature and humidity changes, and the technical means of simply judging whether the measured lead is electrified by detecting the value of the phase electric field strength is hardly feasible in practice).
The core of this patent is two-fold. First, the patent determines whether the wire is in a certain state by determining a short-time event, such as a power failure (or voltage loss)/power up (or power restoration) event, rather than by comparing the magnitude of a steady-state value of the electric field strength of the measured wire; secondly, the patent introduces parameters of current collapse (great reduction)/sudden rise (great increase) to enhance and improve the judgment accuracy, and can obtain extremely high judgment accuracy in practice.
While the preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, the present invention is not limited to the above embodiments, and various changes, which relate to the related art known to those skilled in the art and fall within the scope of the present invention, can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.
Many other changes and modifications can be made without departing from the spirit and scope of the invention. It is to be understood that the invention is not to be limited to the specific embodiments, but only by the scope of the appended claims.
Claims (6)
1. The non-contact detection method for the power-off event of the lead is characterized by comprising the following steps:
(1) sampling current I and voltage V of a wire;
(2) according to the sampled current I and voltage V and three successive periods of time T0、T1、T2To obtain T0State S of the time interval conductor; the state S is an electrified state or an electroless state;
(3) calculating to obtain T1、T2Average voltage V corresponding to two consecutive periods_T1、V_T2And average current I_T1、I_T2From calculated T1、T2Average voltage V corresponding to two consecutive periods_T1、V_T2And average current I_T1、I_T2Judging whether the conditions that the average voltage and the average current are greatly reduced and the lead is in a power-on state occur at the same time or not, if so, judging that a lead voltage loss event occurs, and the state S of the juxtaposed lead is in a power-off state, wherein the lead voltage loss event is a power failure event;
according to the calculated T1、T2Average voltage V corresponding to two consecutive periods_T1、V_T2And average current I_T1、I_T2And judging whether the conditions that the average voltage and the average current are greatly increased and the wire is in a non-power state occur at the same time, if so, judging that a wire power supply recovery event occurs, wherein the state S of the juxtaposed wire is in a power state, and the wire power supply recovery event is a power-on event.
2. The method for non-contact detection of a wire de-energizing event according to claim 1, wherein in step (3), T is calculated by the following steps1、T2Average voltage V corresponding to two consecutive periods_T1、V_T2：
According to the sampled voltage value V, the root mean square value V of the voltage t in each period is calculated by the following steps_rms：
V is a voltage sampling value, N is the number of sampling values t in each period, and the period t is the time for completing one cycle change of the sine alternating current;
according to the calculated root mean square value V of the t voltage per period_rmsCalculating to obtain T according to the following formula1、T2Average voltage V corresponding to two consecutive periods_T1、V_T2：
Wherein M is T1Or T2The number of cycles in the period.
3. The method for non-contact detection of a wire de-energizing event according to claim 1, wherein: in the step (3), T is calculated by the following steps1、T2Average current I for two successive periods_T1、I_T2：
According to the sampled current value I, the root mean square value of the current per period t is calculated by the following stepsI_rms：
Wherein I is a current sampling value, N is the number of sampling values t in each period, and the period t is the time for completing one cycle change of the sine alternating current;
according to the calculated root mean square value I of t current per period_rmsT is calculated according to the following formula1、T2Average current I for two successive periods_T1、I_T2：
Wherein M is T1Or T2The number of cycles in the period.
4. The method for non-contact detection of a wire de-energizing event according to claim 1, wherein: in the step (3), T is obtained according to calculation1、T2Average voltage V corresponding to two consecutive periods_T1、V_T2And average current I_T1、I_T2Judging whether the average voltage and the average current are greatly reduced and the wire is in a power-on state at the same time, if so, judging that a wire voltage loss event occurs, and judging whether the state S of the juxtaposed wire is in a power-off state and meets the following requirements:
the state S of the wire is a powered state,
and is
{(V_T1-V_T2)>0 and (V)_T1-V_T2)/V_T1×100％>First threshold value }
And is
{(I_T1-I_T2)>0 and (I)_T1-I_T2)/I_T1×100％>Second threshold value }
If yes, judging that a lead voltage loss event occurs, and enabling the state S of the juxtaposed leads to be a non-electricity state;
the value range of the first threshold is 30-50%;
the value range of the second threshold is 50% -75%.
5. The method for non-contact detection of a wire de-energizing event according to claim 1, wherein: in the step (3), T is obtained according to calculation1、T2Average voltage V corresponding to two consecutive periods_T1、V_T2And average current I_T1、I_T2Judging whether the conditions that the average voltage and the average current are greatly increased and the wire is in a non-electricity state occur at the same time, if so, judging that a wire power recovery event occurs, and judging whether the state S of the juxtaposed wire is in an electricity state or not:
the state S of the conductive line is a non-electrical state,
and is
{(V_T1-V_T2)<0 and (V)_T2-V_T1)/V_T2×100％>First threshold value }
And is
{(I_T1-I_T2)<0 and (I)_T2-I_T1)/I_T2×100％>Second threshold value }
If so, judging that a power supply recovery event (power-on event) of the lead occurs, and setting the state S of the juxtaposed lead to be a power-on state;
the value range of the first threshold is 30-50%;
the value range of the second threshold is 50% -75%.
6. The method for non-contact detection of a wire de-energizing event according to claim 1, wherein:
the device also comprises a monitoring component for sampling the voltage and the current of the lead, wherein the monitoring component is arranged on the medium-low voltage circuit;
a remote communication module is arranged in the monitoring assembly, and uploads a wire power-on stopping signal to a background main station;
the monitoring assembly is internally provided with a capacitance voltage sensor for detecting the change condition of the electric field intensity of the line in real time, and the monitoring assembly is internally provided with a current sensor for detecting the load current of the line in real time.
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| CN202110015199.5A CN112834868A (en) | 2021-01-06 | 2021-01-06 | Non-contact detection method for wire power-off event |
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| CN202110015199.5A CN112834868A (en) | 2021-01-06 | 2021-01-06 | Non-contact detection method for wire power-off event |
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