CN111366819A - Cable insulation state monitoring system and method - Google Patents
Cable insulation state monitoring system and method Download PDFInfo
- Publication number
- CN111366819A CN111366819A CN202010099777.3A CN202010099777A CN111366819A CN 111366819 A CN111366819 A CN 111366819A CN 202010099777 A CN202010099777 A CN 202010099777A CN 111366819 A CN111366819 A CN 111366819A
- Authority
- CN
- China
- Prior art keywords
- signal
- cable
- insulation
- synchronizer
- voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
- G01R31/1227—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 of components, parts or materials
- G01R31/1263—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 of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—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 of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/025—Measuring very high resistances, e.g. isolation resistances, i.e. megohm-meters
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The disclosure relates to a cable insulation state monitoring system and method, and relates to the technical field of power grids. Wherein, through setting up first signal synchronizer and second signal synchronizer at cable insulation state monitored control system for first signal of telecommunication gathers subassembly and second signal of telecommunication and gathers the subassembly and can carry out synchronous collection to the signal of telecommunication that is surveyed cable both ends, thereby realizes the effective control to the insulation state of being surveyed the cable based on the signal of telecommunication that gathers.
Description
Technical Field
The disclosure relates to the technical field of power grids, in particular to a cable insulation state monitoring system and method.
Background
The power cable is used as an important energy transmission element of the power supply system, but in the operation process of the power cable, the insulation level of the power cable is reduced due to insulation aging or damage and the like, so that the unbalanced operation of the power supply system is caused, even a short-circuit fault is caused, and the reliability of the power supply system is influenced. Therefore, from the viewpoint of power supply reliability and safety, it is necessary to monitor the insulation state of the power cable in the power supply system in real time.
Disclosure of Invention
The invention provides a cable insulation state monitoring system and a method, which extract voltage and current signals in the cable running process in a synchronous measurement mode so as to effectively monitor the cable insulation state.
The technical scheme of the disclosure is as follows:
according to a first aspect of the embodiments of the present disclosure, there is provided a cable insulation state monitoring system, the system including a first electrical signal acquisition component, a second electrical signal acquisition component, a first signal synchronizer, a second signal synchronizer, and an insulation monitoring device;
the first electric signal acquisition assembly is arranged at the first end of the tested cable, the second electric signal acquisition assembly is arranged at the second end of the tested cable, the first electric signal acquisition assembly is respectively connected with the first signal synchronizer and the insulation monitoring equipment, and the second electric signal acquisition assembly is respectively connected with the first signal synchronizer and the insulation monitoring equipment;
the first signal synchronizer and the second signal synchronizer are used for respectively sending synchronous acquisition signals to the first electric signal acquisition assembly and the second electric signal acquisition assembly when receiving a preset synchronous control signal, so that the first electric signal acquisition assembly and the second electric signal acquisition assembly synchronously acquire electric signals at a first end and a second end of the tested cable;
the insulation monitoring equipment is used for monitoring the insulation state of the tested cable according to the received electric signals sent by the first electric signal acquisition assembly and the second electric signal acquisition assembly.
Further, as a possible implementation manner, the first electrical signal acquisition component and the second electrical signal acquisition component each include a signal collector, at least one current transformer, and at least one voltage measurement transformer;
in the first electrical signal acquisition assembly, the signal acquisition device is respectively connected with the first signal synchronizer, the at least one current transformer, the at least one voltage measurement transformer and the insulation monitoring equipment, and the at least one current transformer and the at least one voltage measurement transformer are respectively connected with the first end of the tested cable;
in the second electrical signal collecting assembly, the signal collector is connected with the second signal synchronizer, at least one current transformer, at least one voltage measuring transformer and the insulation monitoring device respectively, and the at least one current transformer and the at least one voltage measuring transformer are connected with the second end of the tested cable respectively.
Further, as a possible implementation manner, the current transformer is a straight-through current transformer, and the voltage measuring transformer is a three-phase voltage transformer.
Further, as a possible implementation manner, the first signal synchronizer and the second signal synchronizer are GPS devices.
According to a second aspect of the embodiments of the present disclosure, there is provided a method for monitoring an insulation state of a cable, which is applied to the foregoing system for monitoring an insulation state of a cable, the method including:
when the first signal synchronizer and the second signal synchronizer receive synchronous acquisition control signals, synchronous acquisition signals are respectively sent to the first electric signal acquisition assembly and the second electric signal acquisition assembly;
the first electric signal assembly acquires the electric signal at the first end of the tested cable when receiving the synchronous acquisition signal and sends the acquired electric signal to the insulation monitoring equipment;
the second electric signal assembly acquires the electric signal at the second end of the tested cable when receiving the synchronous acquisition signal and sends the acquired electric signal to the insulation monitoring equipment;
and the insulation monitoring equipment monitors the insulation state of the tested cable according to the received electric signals sent by the first electric signal acquisition assembly and the second electric signal acquisition assembly.
Further, as a possible implementation manner, the step of monitoring the insulation state of the tested cable by the insulation monitoring device according to the received electric signals sent by the first electric signal acquisition assembly and the second electric signal acquisition assembly includes:
the insulation monitoring equipment calculates a cable insulation parameter for cable insulation state evaluation according to the first current signal, the first voltage signal, the first current signal and the first voltage signal;
and if the cable insulation parameters meet preset conditions, judging that the insulation state of the tested cable is good.
Further, as a possible implementation manner, the cable insulation parameter is insulation resistance, and the insulation resistance G is0Comprises the following steps:
Further, as a possible implementation manner, the cable insulation parameter is a distributed capacitance, and the distributed capacitance C is0Comprises the following steps:
Further, as a possible implementation manner, the cable insulation parameter is a dielectric loss tangent value, and the dielectric loss tangent value tan δ is:
Further, as a possible implementation manner, before the step of sending the synchronous acquisition signals to the first electrical signal acquisition component and the second electrical signal acquisition component respectively when the first signal synchronizer and the second signal synchronizer receive the synchronous acquisition control signal, the method further includes:
the insulation monitoring equipment sends synchronous acquisition control signals to the first signal synchronizer and the second signal synchronizer.
The embodiment of the present disclosure adopts at least one technical scheme that can achieve the following beneficial effects:
through the signal of telecommunication at the measured cable both ends under the synchronous acquisition running state, and then realize the effective control to the insulating state of measured cable based on the signal of telecommunication of gathering, avoided the problem that the effective signal that exists draws difficultly among the correlation technique.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this disclosure, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure and not to limit the disclosure. In the drawings:
fig. 1 is a schematic structural view of a cable insulation state monitoring system according to an exemplary embodiment.
Fig. 2 is a schematic structural view of a cable insulation state monitoring system according to another exemplary embodiment.
FIG. 3 is a schematic diagram illustrating a pi-type line parameter equivalent circuit model in accordance with an exemplary embodiment.
Icon: 10-cable insulation state monitoring system; 11-a first electrical signal acquisition assembly; 12-a second electrical signal acquisition assembly; 13-a first signal synchronizer; 14-a second signal synchronizer; 15-insulation monitoring device.
In order to make the technical solutions of the present disclosure better understood by those of ordinary skill in the art, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings.
Detailed Description
To make the objects, technical solutions and advantages of the present disclosure more apparent, the following embodiments of the present disclosure will be clearly and completely described in conjunction with the accompanying drawings. It is to be understood that the described embodiments are merely a subset of the disclosed embodiments and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.
It should be noted that the terms "first," "second," and the like in the description and claims of the present disclosure and in the above-described drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the disclosure described herein are capable of operation in sequences other than those illustrated or otherwise described herein. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.
At present, a partial discharge method, a direct current component method, a direct current superposition method, an alternating current superposition method, a dielectric loss tangent (tan delta) measurement method, a zero sequence current method, a ground wire current method and the like are mainly adopted to carry out on-line monitoring on the insulation state of the power cable, but the methods all have the problems of high difficulty in extracting effective signals and high difficulty in monitoring the insulation state of the power cable.
In addition, when the power cable normally runs, the line parameters of the power cable are very small, so that the voltage and current difference between the head end and the tail end of the cable is small. In addition, the cable in the power grid is longer, so that the distance between two measuring points is far away, the difference value of voltage and current at the head end and the tail end of the cable is smaller, and the monitoring of the insulation state of the cable is more difficult. In view of this, the present embodiment provides a system and a method for monitoring an insulation state of a cable, which perform synchronous acquisition on voltage and current at the first end and the last end of the cable to more accurately calculate line parameter values of the cable, such as insulation resistance, distributed capacitance, or dielectric loss tangent, and thus, effectively monitor the insulation state of the cable.
The technical solutions provided by the embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.
As shown in fig. 1, a schematic block diagram of a cable insulation state monitoring system 10 is provided for an exemplary embodiment, and the cable insulation state monitoring system 10 includes a first electrical signal acquisition component 11, a second electrical signal acquisition component 12, a first signal synchronizer 13, a second signal synchronizer 14, and an insulation monitoring device 15. The first electrical signal acquisition component 11 is arranged at a first end (such as a head end, i.e. "1" in fig. 1) of the cable to be tested, the second electrical signal acquisition component 12 is arranged at a second end (such as a tail end, i.e. "2" in fig. 1) of the cable to be tested, the first electrical signal acquisition component 11 is respectively connected with the first signal synchronizer 13 and the insulation monitoring device 15, and the second electrical signal acquisition component 12 is respectively connected with the second signal synchronizer 12 and the insulation monitoring device 15.
The first signal synchronizer 13 and the second signal synchronizer 14 are configured to send a synchronous acquisition signal when receiving a preset synchronous control signal, for example, the first signal synchronizer 13 sends the synchronous acquisition signal to the first electrical signal acquisition component 11, and the second signal synchronizer 14 sends the synchronous acquisition signal to the second electrical signal acquisition component 12, so that the first electrical signal acquisition component 11 and the second electrical signal acquisition component 12 acquire and measure electrical signals at the first end and the second end of the tested cable, and accuracy of the acquired electrical signals is ensured.
Alternatively, in some implementations, the synchronization control signal may be sent by the insulation monitoring device 15, or may be sent by another terminal, for example, in this embodiment, in order to ensure the synchronization time service precision of the synchronization measurement, a wide-area synchronization measurement method may be used, that is, nanosecond-level high-precision synchronization sampling may be realized by GPS time service, and the synchronization time service pulse signal may be provided by a global positioning system or the like. Based on this, the first signal synchronizer 13 and the second signal synchronizer 14 provided in the present embodiment may adopt, but are not limited to, GPS devices, which can provide synchronous acquisition signals to the first electrical signal acquisition component 11 and the second electrical signal acquisition component 12 when receiving a synchronous timing pulse signal (i.e. a synchronous control signal) provided by, for example, a global positioning system.
Further, the first electric signal collection assembly 11 and the second electric signal collection assembly 12 are used for collecting electric signals at two ends of the tested cable according to the received synchronous collection signals, and the electric signals can comprise current signals and voltage signals, such as power frequency working voltage signals, power frequency load current signals and the like.
Optionally, referring to fig. 2, as a possible implementation manner, each of the first electrical signal collection assembly 11 and the second electrical signal collection assembly 12 may include a signal collector, at least one current transformer, and at least one voltage measurement transformer. In the first electrical signal collection assembly 11, the signal collector is connected to the first signal synchronizer 13, the at least one current transformer, the at least one voltage measurement transformer and the insulation monitoring device 15, respectively, and the at least one current transformer and the at least one voltage measurement transformer are connected to the first end (e.g., "1" in fig. 2) of the tested cable, respectively.
In the second electrical signal collection assembly 12, the signal collector is connected to a second signal synchronizer 14, at least one current transformer, at least one voltage measurement transformer and an insulation monitoring device 15, respectively, and the at least one current transformer and the at least one voltage measurement transformer are connected to a second end (e.g., "2" in fig. 2) of the cable to be tested, respectively.
It should be noted that "TA 1" shown in fig. 2 is a current transformer in the first electrical signal acquisition assembly 11, "PT 1" is a voltage measurement transformer in the first electrical signal acquisition assembly 11, "TA 2" is a current transformer in the second electrical signal acquisition assembly 12, "PT 2" is a voltage measurement transformer in the second electrical signal acquisition assembly 12, "M" is a load connected to the measured cable, "J" is a switch connected between the load and the measured cable. In practical application, whether the switch J is closed or not can be monitored the insulation state of the cable to be tested based on the technical scheme provided by the embodiment.
In addition, the number of the current transformers and the voltage measuring transformers in the first electrical signal collection assembly 11 and the second electrical signal collection assembly 12 may be set according to the actual condition of the measured cable, for example, please refer to fig. 2 again, the measured cable shown in fig. 2 is a three-phase cable (e.g. A, B, C), and therefore, the number of the current transformers and the number of the voltage measuring transformers in the first electrical signal collection assembly 11 and the second electrical signal collection assembly 12 shown in fig. 2 may be three, and the number of the voltage measuring transformers may be one, which are respectively used for measuring the current signals and the voltage signals on the respective phase cables.
Optionally, the types of the current transformer and the voltage measuring transformer may be selected according to requirements, for example, in this embodiment, the current transformer may be selected, but is not limited to, a straight-through current transformer, and the voltage measuring transformer may be selected, but is not limited to, a three-phase voltage transformer. It should be noted that, in practical implementation, in order to minimize errors caused by the measurement accuracy of the current transformer and the voltage measurement transformer, and ensure the accuracy of the acquired current signal and voltage signal, the model and specification of the current transformer and the voltage measurement transformer in the first electrical signal acquisition component 11 may be consistent with the model and specification of the current transformer and the voltage measurement transformer in the second electrical signal acquisition component 12.
Further, the insulation monitoring device 15 is configured to monitor the insulation state of the cable to be tested according to the received electrical signals sent by the first electrical signal collection component 11 and the second electrical signal collection component 12. When the electrical signal sent by the first electrical signal component 11 includes a first current signal and a first voltage signal, and the electrical signal sent by the second electrical signal component 12 includes a second current signal and a second voltage signal, the insulation monitoring device 15 may calculate a cable insulation parameter for cable insulation state evaluation, such as insulation resistance (i.e., cable line conductance), distributed capacitance, and dielectric loss tangent, according to the first current signal, the first voltage signal, the first current signal, and the first voltage signal.
In this embodiment, taking the pi-type line parameter equivalent circuit model of the power cable shown in fig. 3 as an example, the foregoing cable insulation state monitoring process is described specifically as follows:
firstly, the relation between the line admittance and the voltage and the current at the two ends (the first end and the second end) of the cable can be obtained according to the pi-type line parameter equivalent circuit model
Then, based on the obtained relationship between the voltage and the current, the insulation resistance G can be further obtained0Is composed of
Distributed capacitance C0Is composed of
A dielectric loss tangent tan delta of
Wherein the content of the first and second substances,
a vector value representing the first current signal,
representing the phasor value of the first voltage signal,
a vector value representing the second current signal,
representing the phasor value of the first voltage signal,
is a plurality of
The phase angle of (c), ω, represents the angular velocity.
Finally, based on the calculated insulation resistance G0Distributed capacitance C0And at least one of the dielectric loss tangent tan δ and the insulation state of the cable is judged to be good, for example, if the insulation parameter of the cable is insulation resistance, whether the insulation resistance is larger than a first preset value can be judged, if so, the insulation state of the tested cable is judged to be poor, otherwise, the insulation state of the tested cable is judged to be good.
For another example, if the cable insulation parameter is the distributed capacitance, it may be determined whether the distributed capacitance is greater than a second preset value, and if so, it may be determined that the insulation of the tested cable is poor, otherwise, it may be determined that the insulation of the tested cable is good.
For another example, if the insulation parameter of the cable is the dielectric loss tangent value, it can be determined whether the insulation resistance is within the preset interval, and if so, it is determined that the insulation state of the cable is good, otherwise, it is determined that the insulation state of the cable is poor.
It should be noted that, the actual sizes of the first preset value, the second preset value, and the preset interval need to be set according to the material of the tested cable, and the details thereof are not repeated in this embodiment. In addition, because the insulation monitoring device 15 uses the vector signal obtained by performing vector processing on the electrical signal when monitoring the insulation state based on the received electrical signal, the vector processing process on the electrical signal may be performed on the first signal acquisition component 11 (such as a signal collector) and the second signal acquisition component 12 (such as a signal collector), or may be performed on the insulation monitoring device 15, which is not limited in this embodiment.
It should be noted that, when the cable insulation state monitoring system 10 shown in fig. 1 and fig. 2 is used to implement cable insulation state monitoring, the grounding manner of the cable (i.e., the cable shielding layer) is not limited, for example, the cable may be ungrounded, may be grounded in a single end, may be grounded in a double end, may also be grounded in a cross-connection manner, and the like.
Further, based on the description of the foregoing cable insulation state monitoring system 10, the present embodiment also provides a cable insulation state monitoring method applied to the foregoing cable insulation state monitoring system 10, the method including S10 to S40 described below.
S10, when the first signal synchronizer 13 and the second signal synchronizer 14 receive the synchronous acquisition control signal, the synchronous acquisition control signal is sent to the first electrical signal acquisition assembly 11 and the second electrical signal acquisition assembly 12, respectively.
S20, the first electrical signal component 11 collects the electrical signal at the first end of the tested cable when receiving the synchronous collecting signal, and sends the collected electrical signal to the insulation monitoring device 15.
S30, the second electrical signal component 12 collects the electrical signal at the second end of the tested cable when receiving the synchronous collecting signal, and sends the collected electrical signal to the insulation monitoring device 15. It should be noted that in practical implementation, S20 and S30 need to be implemented simultaneously to synchronously acquire the electrical signals at the first end and the second end of the tested cable, so as to ensure the accuracy of the subsequent insulation state monitoring result.
And S40, the insulation monitoring device 15 monitors the insulation state of the tested cable according to the received electric signals sent by the first electric signal acquisition assembly 11 and the second electric signal acquisition assembly 12.
Alternatively, as a possible implementation manner, when the electrical signal sent by the first electrical signal component includes the first current signal and the first voltage signal, and the electrical signal sent by the second electrical signal component includes the second current signal and the second voltage signal, S40 may be implemented by S400 and S410 described below, which is as follows.
S400, the insulation monitoring device 15 calculates a cable insulation parameter for cable insulation state evaluation according to the first current signal, the first voltage signal, the first current signal and the first voltage signal.
Alternatively, the cable insulation parameters may be, but are not limited to, insulation resistance (i.e., cable line conductance), distributed capacitance, and dielectric tangent. In this embodiment, taking the pi-type line parameter equivalent circuit model of the power cable shown in fig. 3 as an example, the relationship between the line admittance and the voltage and current at the first and last ends of the cable can be obtained according to the model
Based on this relationship, the insulation resistance G can be obtained0Is composed of
Distributed capacitance C0Is composed of
A dielectric loss tangent tan delta of
Wherein the content of the first and second substances,
a vector value representing the first current signal,
representing the phasor value of the first voltage signal,
a vector value representing the second current signal,
representing the phasor value of the first voltage signal,
is a plurality of
The phase angle of (c).
And S410, if the cable insulation parameters meet the preset conditions, judging that the insulation state of the tested cable is good.
Wherein the preset condition in S410 is different according to the insulation parameter of the cable. For example, when the insulation parameter of the cable is insulation resistance, the preset condition may be to determine whether the insulation resistance is greater than a first preset value, and if so, determine that the insulation state of the tested cable is poor, otherwise, determine that the insulation state of the tested cable is good.
For another example, when the cable insulation parameter is the distributed capacitance, the preset condition may be to determine whether the distributed capacitance is greater than a second preset value, and if so, determine that the insulation of the tested cable is poor, otherwise, determine that the insulation of the tested cable is good.
For another example, when the insulation parameter of the cable is the dielectric loss tangent value, the preset condition may be to determine whether the insulation resistance is within a preset interval, and if so, determine that the insulation of the cable to be tested is good, otherwise, determine that the insulation of the cable to be tested is poor.
It should be noted that, the actual sizes of the first preset value, the second preset value, and the preset interval need to be set according to the material of the tested cable, and the details thereof are not repeated in this embodiment. In practical implementation, in addition to determining whether the insulation state of the cable is good or not according to the insulation resistance, the distributed capacitance, and the dielectric loss tangent value, the reason for causing the insulation reduction of the cable, such as moisture, aging, and mechanical damage, may also be determined based on the insulation resistance, the distributed capacitance, and the dielectric loss tangent value, which is not described in this embodiment again.
Further, before S10, the method according to this embodiment further includes: the insulation monitoring device sends synchronous acquisition control signals to a first signal synchronizer 13 and a second signal synchronizer 14.
It should be noted that, since the cable insulation state monitoring method provided in this embodiment has the same or corresponding technical features as the cable insulation state monitoring system, for a detailed description of the cable insulation state monitoring method, reference may be made to the detailed description of the cable insulation state monitoring system, and details of this embodiment are not repeated.
As can be seen from the foregoing description, in the cable insulation state monitoring system and method provided in the present disclosure, by providing the first signal synchronizer 13 and the second signal synchronizer 14 in the cable insulation state monitoring system 10, the first electrical signal acquisition component 11 and the second electrical signal acquisition component 12 can synchronously acquire electrical signals at two ends of a tested cable, so that effective monitoring of an insulation state of the tested cable is realized based on the acquired electrical signals, and a problem of a large difficulty in signal extraction when effective signal extraction is required in the prior art is avoided.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
Claims (10)
1. A cable insulation state monitoring system is characterized by comprising a first electric signal acquisition assembly, a second electric signal acquisition assembly, a first signal synchronizer, a second signal synchronizer and insulation monitoring equipment;
the first electric signal acquisition assembly is arranged at the first end of the tested cable, the second electric signal acquisition assembly is arranged at the second end of the tested cable, the first electric signal acquisition assembly is respectively connected with the first signal synchronizer and the insulation monitoring equipment, and the second electric signal acquisition assembly is respectively connected with the second signal synchronizer and the insulation monitoring equipment;
the first signal synchronizer and the second signal synchronizer are used for respectively sending synchronous acquisition signals to the first electric signal acquisition assembly and the second electric signal acquisition assembly when receiving a preset synchronous control signal, so that the first electric signal acquisition assembly and the second electric signal acquisition assembly synchronously acquire electric signals at a first end and a second end of the tested cable;
the insulation monitoring equipment is used for monitoring the insulation state of the tested cable according to the received electric signals sent by the first electric signal acquisition assembly and the second electric signal acquisition assembly.
2. The cable insulation condition monitoring system according to claim 1, wherein the first electrical signal collection assembly and the second electrical signal collection assembly each comprise a signal collector, at least one current transformer, and at least one voltage measurement transformer;
in the first electrical signal acquisition assembly, the signal acquisition device is respectively connected with the first signal synchronizer, the at least one current transformer, the at least one voltage measurement transformer and the insulation monitoring equipment, and the at least one current transformer and the at least one voltage measurement transformer are respectively connected with the first end of the tested cable;
in the second electrical signal collecting assembly, the signal collector is connected with the second signal synchronizer, at least one current transformer, at least one voltage measuring transformer and the insulation monitoring device respectively, and the at least one current transformer and the at least one voltage measuring transformer are connected with the second end of the tested cable respectively.
3. The cable insulation condition monitoring system according to claim 2, wherein the current transformer is a feedthrough current transformer, and the voltage measuring transformer is a three-phase voltage transformer.
4. The cable insulation condition monitoring system according to claim 1, wherein the first signal synchronizer and the second signal synchronizer are GPS devices.
5. A cable insulation state monitoring method applied to the cable insulation state monitoring system set forth in claim 1, the method comprising:
when the first signal synchronizer and the second signal synchronizer receive synchronous acquisition control signals, synchronous acquisition signals are respectively sent to the first electric signal acquisition assembly and the second electric signal acquisition assembly;
when the first electric signal assembly receives the synchronous acquisition signal, the first electric signal assembly acquires an electric signal at the first end of the cable to be detected and sends the acquired electric signal to the insulation monitoring equipment;
the second electric signal assembly acquires the electric signal at the second end of the tested cable when receiving the synchronous acquisition signal and sends the acquired electric signal to the insulation monitoring equipment;
and the insulation monitoring equipment monitors the insulation state of the tested cable according to the received electric signals sent by the first electric signal acquisition assembly and the second electric signal acquisition assembly.
6. The method for monitoring the insulation state of the cable according to claim 5, wherein the electrical signal sent by the first electrical signal component comprises a first current signal and a first voltage signal, the electrical signal sent by the second electrical signal component comprises a second current signal and a second voltage signal, and the step of monitoring the insulation state of the tested cable by the insulation monitoring device according to the received electrical signals sent by the first electrical signal acquisition component and the second electrical signal acquisition component comprises:
the insulation monitoring equipment calculates a cable insulation parameter for cable insulation state evaluation according to the first current signal, the first voltage signal, the first current signal and the first voltage signal;
and if the cable insulation parameters meet preset conditions, judging that the insulation state of the tested cable is good.
7. The method of claim 6, wherein the cable insulation parameter is insulation resistance, and the insulation resistance G is insulation resistance0Comprises the following steps:
8. The method of claim 6, wherein the cable insulation parameter is a distributed capacitance, and the distributed capacitance C is0Comprises the following steps:
9. The cable insulation state monitoring method according to claim 6, wherein the cable insulation parameter is a dielectric loss tangent, and the dielectric loss tangent tan δ is:
10. The cable insulation state monitoring method according to claim 5, wherein before the step of transmitting the synchronous acquisition signals to the first electrical signal acquisition assembly and the second electrical signal acquisition assembly, respectively, when the first signal synchronizer and the second signal synchronizer receive the synchronous acquisition control signal, the method further comprises:
the insulation monitoring equipment sends synchronous acquisition control signals to the first signal synchronizer and the second signal synchronizer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010099777.3A CN111366819A (en) | 2020-02-18 | 2020-02-18 | Cable insulation state monitoring system and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010099777.3A CN111366819A (en) | 2020-02-18 | 2020-02-18 | Cable insulation state monitoring system and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111366819A true CN111366819A (en) | 2020-07-03 |
Family
ID=71210739
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010099777.3A Pending CN111366819A (en) | 2020-02-18 | 2020-02-18 | Cable insulation state monitoring system and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111366819A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112147412A (en) * | 2020-11-24 | 2020-12-29 | 湖南一二三智能科技有限公司 | Insulation resistance value detection method and device |
| CN113109678A (en) * | 2021-04-15 | 2021-07-13 | 广东电网有限责任公司 | Cable insulation monitoring method and device |
| CN114924162A (en) * | 2022-04-18 | 2022-08-19 | 云南电网有限责任公司电力科学研究院 | Insulation state detection method and system for distribution line |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001165971A (en) * | 1999-12-13 | 2001-06-22 | Meisei Electric Co Ltd | Insulation resistance measuring apparatus |
| CN102879716A (en) * | 2012-09-24 | 2013-01-16 | 哈尔滨理工大学 | Online monitoring method and device for main insulation of three-phase cable under metal sheath cross interconnection |
| CN103675464A (en) * | 2013-11-13 | 2014-03-26 | 国家电网公司 | Power distribution system equivalent ground distributed capacitor measuring method |
| CN106291115A (en) * | 2016-10-27 | 2017-01-04 | 哈尔滨理工大学 | Distance power cable insulation impedance on-line monitoring method |
| CN106595900A (en) * | 2016-11-16 | 2017-04-26 | 国网山东省电力公司东营供电公司 | Extra-high-voltage cable fault monitoring system |
| CN106771869A (en) * | 2016-12-21 | 2017-05-31 | 哈尔滨理工大学 | Long range power cable insulation on-line monitoring method based on current in resistance property partition method |
| CN109917238A (en) * | 2019-02-27 | 2019-06-21 | 江苏科技大学 | Cable for ship on-line insulation monitoring device and monitoring method |
| CN110082636A (en) * | 2019-05-07 | 2019-08-02 | 哈尔滨理工大学 | A kind of power cable fault localization method and system |
-
2020
- 2020-02-18 CN CN202010099777.3A patent/CN111366819A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001165971A (en) * | 1999-12-13 | 2001-06-22 | Meisei Electric Co Ltd | Insulation resistance measuring apparatus |
| CN102879716A (en) * | 2012-09-24 | 2013-01-16 | 哈尔滨理工大学 | Online monitoring method and device for main insulation of three-phase cable under metal sheath cross interconnection |
| CN103675464A (en) * | 2013-11-13 | 2014-03-26 | 国家电网公司 | Power distribution system equivalent ground distributed capacitor measuring method |
| CN106291115A (en) * | 2016-10-27 | 2017-01-04 | 哈尔滨理工大学 | Distance power cable insulation impedance on-line monitoring method |
| CN106595900A (en) * | 2016-11-16 | 2017-04-26 | 国网山东省电力公司东营供电公司 | Extra-high-voltage cable fault monitoring system |
| CN106771869A (en) * | 2016-12-21 | 2017-05-31 | 哈尔滨理工大学 | Long range power cable insulation on-line monitoring method based on current in resistance property partition method |
| CN109917238A (en) * | 2019-02-27 | 2019-06-21 | 江苏科技大学 | Cable for ship on-line insulation monitoring device and monitoring method |
| CN110082636A (en) * | 2019-05-07 | 2019-08-02 | 哈尔滨理工大学 | A kind of power cable fault localization method and system |
Non-Patent Citations (1)
| Title |
|---|
| 魏新劳 等: "长距离三相电力电缆绝缘在线监测方法", 《中国电机工程学报》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112147412A (en) * | 2020-11-24 | 2020-12-29 | 湖南一二三智能科技有限公司 | Insulation resistance value detection method and device |
| CN113109678A (en) * | 2021-04-15 | 2021-07-13 | 广东电网有限责任公司 | Cable insulation monitoring method and device |
| CN114924162A (en) * | 2022-04-18 | 2022-08-19 | 云南电网有限责任公司电力科学研究院 | Insulation state detection method and system for distribution line |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111366819A (en) | Cable insulation state monitoring system and method | |
| EP1089081B1 (en) | Method for computational determination of ground fault distance in an electrical power distribution network having a ring configuration | |
| CN108181547A (en) | A kind of dynamic time warping distance fault section location method based on Time Series Compression | |
| US7233153B2 (en) | Method and system for determining location of phase-to-earth fault | |
| CN103197203A (en) | Fault line selection method based on time domain waveform correlation analysis of three-phase current breaking variable | |
| SE536143C2 (en) | Method for detecting earth faults in three-phase electric power distribution network | |
| CN108132417A (en) | Method for locating single-phase ground fault and device | |
| CN107703416A (en) | Small current neutral grounding system Secondary cases singlephase earth fault Section Location and system | |
| CN113281618B (en) | Low-voltage distribution line fault positioning method and device | |
| WO2019166903A1 (en) | Method and device for fault location in a two-terminal transmission system | |
| JP4295945B2 (en) | Distribution line fault location method and distribution line fault location system | |
| CN103487724A (en) | Single-phase ground fault positioning method of power distribution network | |
| CN205581192U (en) | High pressure current conversion station direct current field transient voltage monitoring devices | |
| CN116754890A (en) | Cable fault online positioning system and positioning method thereof | |
| CN107271775B (en) | electric power overhead line phase detection method | |
| US7076374B2 (en) | Methods and systems for detecting and locating damage in a wire | |
| CN103454561B (en) | A kind of one-phase earthing failure in electric distribution network localization method | |
| Elangovan | Fault noise based approach to phase selection using wavelets based feature extraction | |
| CN114675128A (en) | Submarine cable insulation fault on-line positioning method based on sheath current and voltage | |
| CN107991533A (en) | Voltage-phase localization method based on single-phase cable | |
| Álvarez et al. | Practical experience of insulation condition evaluation in an on-site HV installation applying a PD measuring procedure | |
| US20030006780A1 (en) | Method and device for testing a telecommunication cable | |
| EP1139539B1 (en) | Method for determining the electrical insulation state of the sending end of an electric network | |
| JP3161757B2 (en) | Power system insulation deterioration detection method, insulation deterioration detection device, insulation deterioration detection system, and insulation deterioration determination device | |
| RU2798495C1 (en) | Diagnosis and protection device for overhead power line |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200703 |
|
| RJ01 | Rejection of invention patent application after publication |