CN110764020B - Method, device, equipment and storage medium for detecting residual current of long cable of transformer substation - Google Patents
Method, device, equipment and storage medium for detecting residual current of long cable of transformer substation Download PDFInfo
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- CN110764020B CN110764020B CN201911046917.4A CN201911046917A CN110764020B CN 110764020 B CN110764020 B CN 110764020B CN 201911046917 A CN201911046917 A CN 201911046917A CN 110764020 B CN110764020 B CN 110764020B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/083—Locating faults in cables, transmission lines, or networks according to type of conductors in cables, e.g. underground
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/088—Aspects of digital computing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
Abstract
The invention relates to a method, a device and computer equipment for detecting residual current of a long cable of a transformer substation, wherein the method comprises the following steps: simultaneously detecting the current effective value and the phase voltage effective value of the head end and the tail end of the cable through a leakage detection unit; sending a data synchronization command to the electric leakage detection unit so that the electric leakage detection unit uploads a current effective value and a phase voltage effective value corresponding to the head end and the tail end of the cable; and calculating to obtain the actual effective value of the residual current of the cable according to the received effective value of the current and effective value data of the phase voltage. The electric leakage detection unit is used for simultaneously detecting the current effective value and the phase voltage effective value at the head end and the tail end of the cable, calculating the actual effective value of the residual current of the cable according to the detected current effective value and phase voltage effective value data, realizing the real-time monitoring of the high-resistance grounding of the low-voltage alternating-current cable, monitoring the insulation state of the alternating-current power supply system in real time, effectively improving the state monitoring capability of the alternating-current power supply system, and preventing the electrical fire accidents of the transformer substation.
Description
Technical Field
The invention relates to the field of low-voltage alternating-current power supplies of transformer substations, in particular to a method, a device, equipment and a storage medium for detecting residual current of a long cable of a transformer substation.
Background
In recent years, related national standards, row standards and regulations gradually refine the requirements of dividing power cables, control cables and communication cables into channels and separating the channels and layers in a transformer substation, and as long as 2019 in 5 months, the fire hazard of the cable of the transformer substation is checked as follows:
1. dividing ditches and treating: 39238 transformer substations and 440 transformer substations are developed, and the proportion is 1.12%.
2. Layered remediation: the 10355 substations completed the layered isolation, accounting for 26.39%.
In China network, 4 companies in Jibei, Jiangsu, Chongqing and Fujian respectively select 21 220kV or more transformer substations with different voltage grades, different design time and different equipment types to carry out sensitivity check test on the low-voltage alternating-current circuit breaker. And (3) testing a main feeder cable loop exceeding 100 meters in the alternating current power supply system of the transformer substation, and recording, checking and counting: and 1228 loops are checked in total, checking is carried out according to a coefficient of 1.3 times, the failure rate is 38.8 percent, checking is carried out according to a coefficient of 1.5 times, the failure rate is 609 percent, the failure rate is 49.6 percent, and the overall situation is not optimistic.
Once a low-voltage alternating-current cable of a transformer substation has an electric leakage fire accident, the accident is easily expanded due to insufficient sensitivity of a circuit breaker and mixed channel distribution of power and control cables. Therefore, monitoring measures are necessary to be taken at the current station, and the fire control management capability of the cable is improved.
In the existing scheme, when the residual current of a long cable and the armoured grounding current are detected, the phase of the current at the head end and the tail end must be synchronously sampled, the calculated residual current needs a head end and a tail end synthetic value, the length of the cable is hundreds of meters, so that the secondary output line of the residual current CT is unlikely to be connected and synthesized, and the synchronous sampling of the head section and the tail section is carried out through gps (global positioning system) time synchronization, so that the precision required by the time is too high, and the actual execution error is larger.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a method, a device, equipment and a storage medium for detecting the residual current of a long cable of a transformer substation.
In order to achieve the purpose, the invention adopts the following technical scheme: a method for detecting residual current of a long cable of a transformer substation comprises the following steps:
simultaneously detecting the current effective value and the phase voltage effective value of the head end and the tail end of the cable through a leakage detection unit;
sending a data synchronization command to the electric leakage detection unit so that the electric leakage detection unit uploads a current effective value and a phase voltage effective value corresponding to the head end and the tail end of the cable;
and calculating to obtain the actual effective value of the residual current of the cable according to the received effective value of the current and effective value data of the phase voltage.
Further, after the step of calculating the actual effective value of the residual current of the cable according to the received current effective value and phase voltage effective value data, the method includes:
real-time display is carried out on the actual effective value of the residual current, the effective value of the current and the effective value of the phase voltage;
judging whether the actual effective value of the residual current exceeds the alarm limit value of the residual current or not;
and if the alarm exceeds the preset threshold, sending a real-time alarm.
Further, the step of simultaneously detecting the effective value of the current and the effective value of the phase voltage at the head end and the tail end of the cable through the leakage detection unit comprises the following steps:
the electric leakage detection unit comprises a head end electric leakage detection module and a tail end electric leakage detection module, and the head end and the tail end of the cable are respectively provided with the head end electric leakage detection module and the tail end electric leakage detection module for detection;
the head end electric leakage detection module and the tail end electric leakage detection module simultaneously detect and obtain the head end electric current effective value I of the cable1And effective value of end cable I2；
The effective value U of the voltage of the head end phase of the cable is detected and obtained through the head end electric leakage detection module and the tail end electric leakage detection module simultaneously1And end phase voltage effective value U2；
Detecting and acquiring a head end phase angle theta through a head end electric leakage detection module and a tail end electric leakage detection module1And the terminal phase angle theta2。
Further, the step of calculating the actual effective value of the residual current of the cable according to the received effective value of the current and the effective value of the phase voltage includes:
calculating the actual effective value I of the residual current by a vector synthesis algorithm according to the effective value of the current and the effective value of the phase voltageCombination of Chinese herbsActual effective value of residual current ICombination of Chinese herbsThe calculation formula is as follows:
wherein, I1Effective value of head end current, I2Is the effective value of the terminal current, theta1Is the head end phase angle, θ2Is the terminal phase angle.
Further, the step of sending a data synchronization command to the leakage detection module so that the leakage detection module uploads a current effective value and a phase voltage effective value corresponding to the head end and the tail end of the cable includes:
the electric leakage detection module uploads the current effective value and the phase voltage effective value corresponding to the head end and the tail end of the cable through wired transmission or wireless transmission.
The invention also adopts the following technical scheme: a transformer substation long cable residual current detection system comprises:
the leakage detection unit is used for simultaneously detecting the current effective value and the phase voltage effective value of the head end and the tail end of the cable;
the data acquisition unit is used for sending a data synchronization command to the electric leakage detection module so as to enable the electric leakage detection module to upload a current effective value and a phase voltage effective value corresponding to the head end and the tail end of the cable;
and the current calculating unit is used for calculating to obtain the actual effective value of the residual current of the cable according to the received data.
Further, the electric leakage detection unit comprises a head end electric leakage detection module and a tail end electric leakage detection module, the head end electric leakage detection module and the tail end electric leakage detection module are respectively arranged at the head end and the tail end of the cable, and the head end electric leakage detection module and the tail end electric leakage detection module are used for simultaneously detecting and acquiring the head end current effective value I of the cable1And effective value of end cable I2(ii) a The head end electric leakage detection module and the tail end electric leakage detection module are used for simultaneously detecting and acquiring a head end phase voltage effective value U of the cable1And end phase voltage effective value U2(ii) a The head end electric leakage detection module and the tail end electric leakage detection module are used for detecting and acquiring a head end phase angle theta1And the terminal phase angle theta2。
Further, the current calculation unit comprises a current calculation module for calculating the actual effective value I of the residual current through a vector synthesis algorithm according to the effective value of the current and the effective value of the phase voltageCombination of Chinese herbsActual effective value of residual current ICombination of Chinese herbsThe calculation formula is as follows:
wherein, I1Effective value of head end current, I2Is the effective value of the terminal current, theta1Is the head end phase angle, θ2Is the terminal phase angle.
The invention also adopts the following technical scheme: a computer device comprising a memory having a computer program stored thereon and a processor that, when executed, implements a substation long cable residual current detection method as described in any one of the above.
The invention also adopts the following technical scheme: a storage medium storing a computer program which, when executed by a processor, is operable to implement a substation long cable residual current detection method as claimed in any one of the preceding claims.
Compared with the prior art, the invention has the beneficial effects that: the electric leakage detection unit is used for simultaneously detecting the current effective value and the phase voltage effective value at the head end and the tail end of the cable, calculating the actual effective value of the residual current of the cable according to the detected current effective value and phase voltage effective value data, realizing the real-time monitoring of the high-resistance grounding of the low-voltage alternating-current cable, monitoring the insulation state of the station alternating-current power supply system in real time, effectively improving the state monitoring capability of the station alternating-current power supply system, and preventing the electric fire accidents of the transformer substation.
The invention is further described below with reference to the accompanying drawings and specific embodiments.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic view of an application scenario of a method for detecting a residual current of a long cable of a substation according to an embodiment of the present invention;
fig. 2 is a detection schematic diagram of a method for detecting a residual current of a long cable of a substation according to an embodiment of the present invention;
the method for detecting the residual current of the long cable of the transformer station provided by the embodiment of the invention comprises the following steps of (1) schematically illustrating the flow of the method for detecting the residual current of the long cable of the transformer station;
fig. 3 is a schematic flowchart of a method for detecting a residual current of a long cable of a substation according to an embodiment of the present invention;
fig. 4 is a schematic sub-flow chart of a method for detecting a residual current of a long cable of a substation according to an embodiment of the present invention;
fig. 5 is a schematic flowchart of a method for detecting a residual current of a long cable of a substation according to another embodiment of the present invention;
fig. 6 is a schematic block diagram of a substation long cable residual current detection device according to an embodiment of the present invention;
fig. 7 is a schematic block diagram of a leakage detecting unit of a substation long cable residual current detecting device according to an embodiment of the present invention;
fig. 8 is a schematic block diagram of a current calculating unit of a long-cable residual current detecting device of a substation according to an embodiment of the present invention;
fig. 9 is a schematic block diagram of a substation long cable residual current detection device according to another embodiment of the present invention;
FIG. 10 is a schematic diagram of head and tail end residual current vector synthesis according to the present invention;
FIG. 11 is a schematic block diagram of a computer device provided by an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. 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 invention.
It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It is also to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be further understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.
Referring to fig. 1 and 3, fig. 1 is a schematic view of an application scenario of a method for detecting a residual current of a long cable of a substation according to an embodiment of the present invention. Fig. 3 is a schematic flowchart of a method for detecting a residual current of a long cable of a substation according to an embodiment of the present invention. The method for detecting the residual current of the long cable of the transformer substation is characterized in that in a detection terminal 100, the detection terminal 100 and an electric leakage detection unit 10 carry out data interaction, the electric leakage detection unit 10 detects a current effective value, a phase voltage effective value and a phase angle of the head end and the tail end of the long cable, the current effective value, the phase voltage effective value and the phase angle are uploaded to the detection terminal 100, and the detection terminal 100 obtains a residual current vector synthetic value, namely the actual residual current effective value of the long cable, through vector analysis and synthesis.
Fig. 3 is a schematic flow chart of a method for detecting a residual current of a long cable of a substation according to an embodiment of the present invention. As shown in fig. 3, the method includes the following steps S110 to S130.
And S110, simultaneously detecting the current effective value and the phase voltage effective value of the head end and the tail end of the cable through the leakage detection unit.
In this embodiment, the leakage detecting unit 10 is configured to detect parameters such as a residual current, a phase voltage, and a phase angle at the head end and the tail end of the long cable, as shown in fig. 2, the leakage detecting unit 10 specifically includes a head end leakage detecting module 11 and a tail end leakage detecting module 12, the head end leakage detecting module 11 is configured to detect a current-related parameter at the head end of the cable, and the tail end leakage detecting module 12 is configured to detect a current-related parameter at the tail end of the cable. Because the phase of the phase voltage on the same transmission line (cable) is always kept unchanged, the actual effective value of the residual current of the cable can be calculated according to the effective values of the currents at the first end and the last end of the cable.
Referring to FIG. 4, in one embodiment, step S110 includes steps S111-S114.
And S111, respectively arranging a head end electric leakage detection module and a tail end electric leakage detection module for detection at the head end and the tail end of the cable.
In this embodiment, the leakage detecting unit includes a head end leakage detecting module 11 and a tail end leakage detecting module 12, the head end leakage detecting module 11 is arranged at the head end of the cable for detecting the current related parameters of the head end of the cable, the tail end leakage detecting module 12 is arranged at the tail end of the cable for detecting the current related parameters of the tail end of the cable, and when detecting the related parameters, the head end leakage detecting module 11 and the tail end leakage detecting module 12 are required to be connected to the position corresponding to the cable first.
S112, simultaneously detecting and acquiring the head end current effective value I of the cable through the head end electric leakage detection module and the tail end electric leakage detection module1And effective value of end cable I2。
S113, simultaneously detecting and acquiring the effective value U of the head-end phase voltage of the cable through the head-end leakage detection module and the tail-end leakage detection module1And end phase voltage effective value U2。
S114, detecting and acquiring a head end phase angle theta through a head end electric leakage detection module and a tail end electric leakage detection module1And the terminal phase angle theta2。
In this embodiment, the head-end leakage detecting module 11 is disposed at the head end of the cable for detecting current-related parameters at the head end of the cable, and the tail-end leakage detecting module 12 is disposed at the tail end of the cable for detecting current-related parameters at the tail end of the cable. The head end current effective value I of the head end of the cable can be detected through the head end electric leakage detection module 111Effective value U of sum-head phase voltage1And according to the head end current effective value I1Effective value U of sum-head phase voltage1Obtaining a head end phase angle theta1(ii) a The effective value I of the tail end current of the cable tail end can be detected and obtained through the tail end leakage detection module 1212And end phase voltage effective value U2And according to the effective value of the end current I2And end phase voltage effective value U2Obtaining the end phase angle theta2。
And S120, sending a data synchronization command to the electric leakage detection unit so that the electric leakage detection unit uploads the current effective value and the phase voltage effective value corresponding to the head end and the tail end of the cable.
In this embodiment, the detection terminal issues a data synchronization command to the head-end leakage detection module 11 and the tail-end leakage detection module 12, and the head-end leakage detection moduleThe electric leakage data of the block 11 and the terminal electric leakage detection module 12 are latched in a transient state and uploaded to the detection terminal, and the detection terminal receives the electric leakage data uploaded by the head end and the tail end at the moment, wherein the electric leakage data comprise: effective value of head end current I1And effective value of end cable I2Effective value of head-end phase voltage U1And end phase voltage effective value U2And head end phase angle θ1And the terminal phase angle theta2。
In one embodiment, step S120 includes step S121.
And S121, uploading the current effective value and the phase voltage effective value corresponding to the head end and the tail end of the cable by the electric leakage detection unit through wired transmission or wireless transmission.
In this embodiment, the wired transmission may be a conventional wired transmission manner, such as wired 485 transmission; the wireless transmission may be a conventional wireless transmission, such as a wireless LORA transmission, or a wireless WIFI transmission.
And S130, calculating to obtain the actual effective value of the residual current of the cable according to the received effective value of the current and effective value data of the phase voltage.
In this embodiment, after the detection terminal receives the electric leakage data uploaded by the head end electric leakage detection module 11 and the tail end electric leakage detection module 12, the actual effective value data of the residual current of the cable is obtained according to the data calculation, and the actual effective value of the residual current is directly displayed and monitored and alarmed, and after the actual effective value of the residual current is operated out of the alarm limit value of the residual current, the corresponding cable is alarmed and further monitored in real time.
Referring to fig. 3, in an embodiment, step S130 includes step S131.
S131, calculating the actual effective value I of the residual current through a vector synthesis algorithm according to the effective value of the current and the effective value of the phase voltageCombination of Chinese herbsActual effective value of residual current ICombination of Chinese herbsThe calculation formula is as follows:
wherein，I1Effective value of head end current, I2Is the effective value of the terminal current, theta1Is the head end phase angle, θ2Is the terminal phase angle.
In this embodiment, the phase of the phase voltage on the same transmission line (cable) is always kept constant, so the detection terminal can detect the received I1And I2Vector synthesis is directly carried out, the vector synthesis principle is shown in figure 10, the actual effective value of the residual current of the cable can be obtained, the detection reliability of the residual current of the long cable or the armored grounding current in the alternating current power supply system is improved, the alternating current power supply system is safer and more reliable, and the method plays an important role in preventing electrical fire.
This scheme passes through electric leakage detecting element and detects cable head and end's electric current virtual value and looks voltage virtual value simultaneously to according to electric current virtual value and the looks voltage virtual value that detect, calculate the actual virtual value of the residual current that obtains the cable, realize the real time monitoring to low pressure alternating current cable high resistance ground connection, can carry out real time supervision to the station with alternating current power supply system insulating state, effectively promote the station with alternating current power supply system state monitoring ability, take precautions against the electrical fire accident of transformer substation.
Fig. 5 is a flowchart illustrating a method for automatically downloading a driver according to another embodiment of the present invention. As shown in fig. 5, the method of automatically downloading the driving of the present embodiment includes steps S210 to S260. Steps S210 to S230 are the same as steps S110 to S130 in the above embodiments, and are not described herein again. Steps S240-S260 are as follows:
and S240, displaying the actual effective value of the residual current, the effective value of the current and the effective value of the phase voltage in real time.
In this embodiment, the actual effective value of the residual current obtained by calculation, and the current effective value and phase voltage effective value data obtained by detection are displayed on the display device in real time, so that an operator can visually acquire leakage data of different currents, and the safety state of the cable can be acquired more conveniently.
And S250, judging whether the actual effective value of the residual current exceeds the alarm limit value of the residual current.
And S260, if the alarm exceeds the preset threshold value, sending a real-time alarm.
As for steps S250 and S260, in this embodiment, by comparing the actual effective value of the residual current with the alarm limit value of the residual current, when the actual effective value of the residual current exceeds the alarm limit value of the residual current, an alarm is issued in time, so as to prevent an electrical fire accident from occurring in time, and ensure the safety and reliability of the ac power supply system.
This scheme passes through electric leakage detecting element and detects cable head and end's electric current virtual value and looks voltage virtual value simultaneously to according to electric current virtual value and the looks voltage virtual value that detect, calculate the actual virtual value of the residual current that obtains the cable, realize the real time monitoring to low pressure alternating current cable high resistance ground connection, can carry out real time supervision to the station with alternating current power supply system insulating state, effectively promote the station with alternating current power supply system state monitoring ability, take precautions against the electrical fire accident of transformer substation.
Fig. 6 is a schematic block diagram of a substation long cable residual current detection device according to an embodiment of the present invention. As shown in fig. 6, the present invention further provides a device for detecting a residual current of a long cable of a substation, corresponding to the method for detecting a residual current of a long cable of a substation. The substation long cable residual current detection device comprises a unit for executing the substation long cable residual current detection device, and the device can be configured in a desktop computer, a tablet computer, a portable computer and other terminals. Specifically, referring to fig. 6, in the present embodiment, an automatic download driving apparatus includes a leakage detecting unit 10, a data obtaining unit 20 and a current calculating unit 30.
And a leakage detection unit 10 for simultaneously detecting the effective current value and the effective phase voltage value at the head end and the tail end of the cable.
In this embodiment, the leakage detecting unit 10 includes a head end leakage detecting module 11 and a tail end leakage detecting module 12, the head end leakage detecting module 11 is disposed at the head end of the cable and used for detecting the current-related parameters at the head end of the cable, the tail end leakage detecting module 12 is disposed at the tail end of the cable and used for detecting the current-related parameters at the tail end of the cable, and when detecting the related parameters, the head end leakage detecting module 11 and the tail end leakage detecting module 12 need to be inserted into the position corresponding to the cable first.
In an embodiment, as shown in fig. 7, the leakage detecting unit 10 includes a head-end leakage detecting module 11 and a tail-end leakage detecting module 12, the head-end leakage detecting module 11 and the tail-end leakage detecting module 12 are respectively disposed at the head and tail ends of the cable, and the head-end leakage detecting module 11 and the tail-end leakage detecting module 12 are configured to simultaneously detect and obtain a head-end current effective value I of the cable1And effective value of end cable I2(ii) a The head end electric leakage detection module 11 and the tail end electric leakage detection module 12 are used for simultaneously detecting and acquiring a head end phase voltage effective value U of the cable1And end phase voltage effective value U2(ii) a The head end leakage detection module 11 and the tail end leakage detection module 12 are used for detecting and acquiring a head end phase angle theta1And the terminal phase angle theta2。
Specifically, the head end leakage detection module 11 is disposed at the head end of the cable and used for detecting current-related parameters at the head end of the cable, and the tail end leakage detection module 12 is disposed at the tail end of the cable and used for detecting current-related parameters at the tail end of the cable. The head end current effective value I of the head end of the cable can be detected through the head end electric leakage detection module 111Effective value U of sum-head phase voltage1And according to the head end current effective value I1Effective value U of sum-head phase voltage1Obtaining a head end phase angle theta1(ii) a The effective value I of the tail end current of the cable tail end can be detected and obtained through the tail end leakage detection module 1212And end phase voltage effective value U2And according to the effective value of the end current I2And end phase voltage effective value U2Obtaining the end phase angle theta2。
And the data acquisition unit 20 is configured to send a data synchronization command to the leakage detection module, so that the leakage detection module uploads the current effective value and the phase voltage effective value corresponding to the head end and the tail end of the cable.
In this embodiment, the detection terminal issues a data synchronization command to the head-end leakage detection module 11 and the tail-end leakage detection module 12, and at this time, the leakage data of the head-end leakage detection module 11 and the tail-end leakage detection module 12 are transiently latched and uploaded to the detection terminal, and at this time, the detection terminal sends a data synchronization command to the head-end leakage detection module 11 and the tail-end leakage detection module 12The detection terminal receives the electric leakage data uploaded by the head end and the tail end, and the electric leakage data comprise: effective value of head end current I1And effective value of end cable I2Effective value of head-end phase voltage U1And end phase voltage effective value U2And head end phase angle θ1And the terminal phase angle theta2。
The leakage detecting unit 10 uploads the current effective value and the phase voltage effective value corresponding to the head end and the tail end of the cable to the detecting terminal through wired transmission or wireless transmission. In this embodiment, the wired transmission may be a conventional wired transmission manner, such as wired 485 transmission; the wireless transmission may be a conventional wireless transmission, such as a wireless LORA transmission, or a wireless WIFI transmission.
And the current calculating unit 30 is used for calculating to obtain the actual effective value of the residual current of the cable according to the received data.
In this embodiment, after the detection terminal receives the electric leakage data uploaded by the head end electric leakage detection module 11 and the tail end electric leakage detection module 12, the actual effective value data of the residual current of the cable is obtained through calculation according to the data, and is directly displayed according to the actual effective value of the residual current, and the monitoring and alarming are performed, and after the actual effective value of the residual current operates the alarm limit value of the residual current, the corresponding cable is subjected to real-time alarming and further monitoring.
In one embodiment, as shown in fig. 8, the current calculating unit 30 includes a current calculating module 31 for calculating an actual effective value I of the residual current by a vector synthesis algorithm according to the effective values of the current and the effective values of the phase voltageCombination of Chinese herbsActual effective value of residual current ICombination of Chinese herbsThe calculation formula is as follows:
wherein, I1Effective value of head end current, I2Is the effective value of the terminal current, theta1Is the head end phase angle, θ2Is the terminal phase angle.
In this embodiment, the same passThe phase of phase voltage on the transmission line (cable) is always kept unchanged, so that the detection terminal can detect the received I1And I2Vector synthesis is directly carried out, the vector synthesis principle is shown in figure 10, the actual effective value of the residual current of the cable can be obtained, the detection reliability of the residual current of the long cable or the armored grounding current in the alternating current power supply system is improved, the alternating current power supply system is safer and more reliable, and the method plays an important role in preventing electrical fire.
It should be appreciated that in one embodiment, the data acquisition unit 20 and the current calculation unit 30 may be integrated with the test terminal 100 as part of the test terminal 100 to implement the above-described functions.
This scheme passes through electric leakage detecting element 10 and detects cable head and end's electric current virtual value and phase voltage virtual value simultaneously to according to electric current virtual value and the phase voltage virtual value that detect, calculate the actual virtual value of the residual current that obtains the cable, realize the real time monitoring to low pressure alternating current cable high resistance ground connection, can carry out real time supervision to the station with alternating current power supply system insulating state, effectively promote the station with alternating current power supply system state monitoring ability, take precautions against the electrical fire accident of transformer substation.
Referring to fig. 9, in another embodiment of the present invention, an apparatus for automatically downloading drivers further includes: including a real-time presentation unit 40 and a judgment alert unit 50.
And the real-time display unit 40 is used for displaying the actual effective value of the residual current, the effective value of the current and the effective value data of the phase voltage in real time.
In the real-time example, the actual effective value of the residual current obtained by calculation, the current effective value and the phase voltage effective value data obtained by detection are displayed on the display device in real time, so that an operator can visually acquire the leakage data of different currents, and the safety state of the cable can be acquired more conveniently.
It should be understood that the real-time display unit 40 may be a display terminal with a display function for displaying corresponding data and displaying the data directly to an operator, and a specific display terminal is directly connected to the detection terminal 100, and further, the real-time display unit 40 may also be integrated as a part in the detection terminal 100.
The judgment warning unit 50 is used for judging whether the actual effective value of the residual current exceeds the residual current warning limit value; and if the alarm exceeds the preset threshold, sending a real-time alarm.
In the embodiment, the actual effective value of the residual current and the residual current alarm limit value are used for giving an alarm in time when the actual effective value of the residual current exceeds the residual current alarm limit value, so that the occurrence of an electrical fire accident is prevented in time, and the safety and the reliability of the alternating current power supply system are ensured.
This scheme passes through electric leakage detecting element 10 and detects cable head and end's electric current virtual value and phase voltage virtual value simultaneously to according to electric current virtual value and the phase voltage virtual value that detect, calculate the actual virtual value of the residual current that obtains the cable, realize the real time monitoring to low pressure alternating current cable high resistance ground connection, can carry out real time supervision to the station with alternating current power supply system insulating state, effectively promote the station with alternating current power supply system state monitoring ability, take precautions against the electrical fire accident of transformer substation.
It should be noted that, as can be clearly understood by those skilled in the art, the specific implementation processes of the automatic download driving apparatus and each unit may refer to the corresponding descriptions in the foregoing method embodiments, and for convenience and brevity of description, no further description is provided herein.
Referring to fig. 11, fig. 11 is a schematic block diagram of a computer device according to an embodiment of the present application. The computer device 500 may be a terminal or a server, where the terminal may be an electronic device with a communication function, such as a smart phone, a tablet computer, a notebook computer, a desktop computer, a personal digital assistant, and a wearable device. The server may be an independent server or a server cluster composed of a plurality of servers.
Referring to fig. 11, the computer device 500 includes a processor 502, memory, and a network interface 505 connected by a system bus 501, where the memory may include a non-volatile storage medium 503 and an internal memory 504.
The non-volatile storage medium 503 may store an operating system 5031 and a computer program 5032. The computer program 5032 comprises program instructions that, when executed, cause the processor 502 to perform a substation long cable residual current detection method.
The processor 502 is used to provide computing and control capabilities to support the operation of the overall computer device 500.
The internal memory 504 provides an environment for the operation of the computer program 5032 in the non-volatile storage medium 503, and when the computer program 5032 is executed by the processor 502, the processor 502 may be enabled to execute a substation long cable residual current detection method.
The network interface 505 is used for network communication with other devices. Those skilled in the art will appreciate that the configuration shown in fig. 11 is a block diagram of only a portion of the configuration associated with the present application and does not constitute a limitation of the computer device 500 to which the present application may be applied, and that a particular computer device 500 may include more or less components than those shown, or may combine certain components, or have a different arrangement of components.
It should be understood that, in the embodiment of the present Application, the Processor 502 may be a Central Processing Unit (CPU), and the Processor 502 may also be other general-purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) or other Programmable logic devices, discrete Gate or transistor logic devices, discrete hardware components, and the like. Wherein a general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
It will be understood by those skilled in the art that all or part of the flow of the method implementing the above embodiments may be implemented by a computer program instructing associated hardware. The computer program includes program instructions, and the computer program may be stored in a storage medium, which is a computer-readable storage medium. The program instructions are executed by at least one processor in the computer system to implement the flow steps of the embodiments of the method described above.
Accordingly, the present invention also provides a storage medium. The storage medium may be a computer-readable storage medium. The storage medium stores a computer program.
The storage medium may be a usb disk, a removable hard disk, a Read-Only Memory (ROM), a magnetic disk, or an optical disk, which can store various computer readable storage media.
Those of ordinary skill in the art will appreciate that the elements and algorithm steps of the examples described in connection with the embodiments disclosed herein may be embodied in electronic hardware, computer software, or combinations of both, and that the components and steps of the examples have been described in a functional general in the foregoing description for the purpose of illustrating clearly the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative. For example, the division of each unit is only one logic function division, and there may be another division manner in actual implementation. For example, various elements or components may be combined or may be integrated into another system, or some features may be omitted, or not implemented.
The steps in the method of the embodiment of the invention can be sequentially adjusted, combined and deleted according to actual needs. The units in the device of the embodiment of the invention can be merged, divided and deleted according to actual needs. In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a storage medium. Based on such understanding, the technical solution of the present invention essentially or partially contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a terminal, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention.
While the invention has been described with reference to specific embodiments, the invention is not limited thereto, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. A method for detecting residual current of a long cable of a transformer substation is characterized by comprising the following steps:
simultaneously detecting the current effective value and the phase voltage effective value of the head end and the tail end of the cable through a leakage detection unit;
sending a data synchronization command to the electric leakage detection unit so that the electric leakage detection unit uploads a current effective value and a phase voltage effective value corresponding to the head end and the tail end of the cable;
according to the received current effective value and phase voltage effective value data, calculating to obtain the actual effective value of the residual current of the cable, according to the current effective value and the phase voltage effective value data, calculating the actual effective value of the residual current by a vector synthesis algorithm, wherein the actual effective value of the residual current is calculated by a formula:
wherein I1 is a head end current effective value, I2 is a tail end current effective value, theta 1 is a head end phase angle, and theta 2 is a tail end phase angle;
the head end phase angle theta 1 and the tail end phase angle theta 2 are detected and obtained through the head end electric leakage detection module and the tail end electric leakage detection module.
2. The method for detecting the residual current of the long cable of the transformer substation according to claim 1, wherein after the step of calculating the actual effective value of the residual current of the cable according to the received effective value of the current and the effective value of the phase voltage, the method comprises the following steps:
real-time display is carried out on the actual effective value of the residual current, the effective value of the current and the effective value of the phase voltage;
judging whether the actual effective value of the residual current exceeds the alarm limit value of the residual current or not;
and if the alarm exceeds the preset threshold, sending a real-time alarm.
3. The method for detecting the residual current of the long cable of the transformer substation according to claim 1, wherein the step of simultaneously detecting the effective current value and the effective phase voltage value of the head end and the tail end of the cable by the leakage detecting unit comprises the following steps:
the electric leakage detection unit comprises a head end electric leakage detection module and a tail end electric leakage detection module, and the head end and the tail end of the cable are respectively provided with the head end electric leakage detection module and the tail end electric leakage detection module for detection;
the head end electric leakage detection module and the tail end electric leakage detection module simultaneously detect and obtain the head end electric current effective value I of the cable1And the effective value of the end current I2；
The effective value U of the voltage of the head end phase of the cable is detected and obtained through the head end electric leakage detection module and the tail end electric leakage detection module simultaneously1And end phase voltage effective value U2。
4. The method for detecting the residual current of the long cable of the transformer substation according to claim 1, wherein the step of sending a data synchronization command to the leakage detection unit so that the leakage detection unit uploads the effective current value and the effective phase voltage value corresponding to the head end and the tail end of the cable comprises:
the electric leakage detection unit uploads the current effective value and the phase voltage effective value corresponding to the head end and the tail end of the cable through wired transmission or wireless transmission.
5. The utility model provides a long cable residual current detection device of transformer substation which characterized in that includes:
the leakage detection unit is used for simultaneously detecting the current effective value and the phase voltage effective value of the head end and the tail end of the cable;
the data acquisition unit is used for sending a data synchronization command to the electric leakage detection module so as to enable the electric leakage detection module to upload a current effective value and a phase voltage effective value corresponding to the head end and the tail end of the cable;
the current calculating unit is used for calculating to obtain an actual effective value of the residual current of the cable according to the received data;
the electric leakage detection unit comprises a head end electric leakage detection module and a tail end electric leakage detection module, wherein the head end electric leakage detection module and the tail end electric leakage detection module are used for detecting and acquiring a head end phase angle theta1And the terminal phase angle theta2；
The current calculation unit comprises a current calculation module for calculating the actual effective value I of the residual current through a vector synthesis algorithm according to the effective value of the current and the effective value of the phase voltageCombination of Chinese herbsActual effective value of residual current ICombination of Chinese herbsThe calculation formula is as follows:
wherein, I1Effective value of head end current, I2Is the effective value of the terminal current, theta1Is the head end phase angle, θ2Is the terminal phase angle.
6. The substation long cable residual current detection device as claimed in claim 5, wherein the head end leakage detection module and the tail end leakage detection module are respectively disposed at the head end and the tail end of the cable, and the head end leakage detection module and the tail end leakage detection module are respectively disposed at the tail end and the head end of the cableThe electric leakage detection module is used for simultaneously detecting and acquiring the head end current effective value I of the cable1And the effective value of the end current I2(ii) a The head end electric leakage detection module and the tail end electric leakage detection module are used for simultaneously detecting and acquiring a head end phase voltage effective value U of the cable1And end phase voltage effective value U2。
7. A computer device, characterized in that the computer device comprises a memory and a processor, the memory is stored with a computer program, the processor when executing the computer program realizes the substation Long Cable residual current detection method according to any one of claims 1 to 4.
8. A storage medium storing a computer program which, when executed by a processor, implements the substation long cable residual current detection method according to any one of claims 1 to 4.
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| CN112014698A (en) * | 2020-08-26 | 2020-12-01 | 浙江巨磁智能技术有限公司 | Long cable residual current detection device and method for low-voltage alternating current power supply system |
| CN112710931B (en) * | 2020-12-16 | 2022-09-09 | 国网江苏省电力有限公司检修分公司 | Method and system for detecting earth leakage current of secondary side long-distance cable pair of alternating current system |
| CN113721065A (en) * | 2021-08-26 | 2021-11-30 | 安徽南瑞继远电网技术有限公司 | Alternating current data acquisition device for station and acquisition method thereof |
| CN114184869A (en) * | 2021-12-13 | 2022-03-15 | 中浙信科技咨询有限公司 | Campus electricity utilization information analysis method and device based on big data analysis |
| CN116027098A (en) * | 2023-02-14 | 2023-04-28 | 青岛鼎信通讯股份有限公司 | Leakage current detection method suitable for flexible direct current comprehensive voltage regulating device |
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