CN208239561U - Cable accessory partial discharge monitoring device - Google Patents
Cable accessory partial discharge monitoring device Download PDFInfo
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- CN208239561U CN208239561U CN201820229279.4U CN201820229279U CN208239561U CN 208239561 U CN208239561 U CN 208239561U CN 201820229279 U CN201820229279 U CN 201820229279U CN 208239561 U CN208239561 U CN 208239561U
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Abstract
The utility model provides a kind of cable accessory partial discharge monitoring device, comprising: detection module be set on cable accessory and/or ground wire return wire on, including polarization light unit, Fibre Optical Sensor unit and luminous intensity measurement unit；Light unit is polarized, the polarised light group including at least two polarised lights is used to form, using polarization light unit output end polarised light light intensity value as the first light intensity value；Fibre Optical Sensor unit is connect with polarization light unit, is used for transmission polarised light；Luminous intensity measurement unit is connect with Fibre Optical Sensor unit, for carrying out coherent superposition to the polarised light after Fibre Optical Sensor unit, using luminous intensity measurement unit output end polarised light light intensity value as the second light intensity value；Host computer is connect with detection module, for obtaining Partial Discharge Detection result according to the first light intensity value and the second light intensity value.Detection module is able to detect that the local discharge signal in bigger frequency range, and can real-time monitoring shelf depreciation situation, improve the accuracy of Partial Discharge Detection.
Description
Technical field
The utility model relates to power equipment state monitoring technical fields, and in particular to a kind of cable accessory shelf depreciation prison
Survey device.
Background technique
Crosslinked polyethylene (XLPE) cable is because its structure is simple, transmission line capability is big, light-weight, installation maintenance is easy, processing
The advantages that manufacturing expense is low, stable, is widely used in electric system.HV XLPE Power Cable attachment
(including transition joint and terminal fitting) is internal because there are a large amount of compound interfaces and electric field stress concentration phenomenon, in addition cable accessory
Phenomena such as production is with impurity or semiconductor layer tip protrusion is inevitably present in installation process, so as to cause electric field collection
In, it generates insulation defect (such as hole, impurity, water tree), for a long time in various extraneous factors (mechanical, heating power) and electric field action
Under, the probability that insulation fault occurs for cable accessory is much larger than cable body.Shelf depreciation is the important characterization of insulation defect, and
One of the main reason for promoting insulation degradation, measuring device shelf depreciation can in time, accurately grasp cable accessory and system
State of insulation.
The development process of shelf depreciation except having outside the Pass with insulation defect itself, also with the close phase of cable run operating condition
It closes.Change in frequent cable run in load, under the Thermal Stress effect persistently changed, cable conductor, insulating layer occur
Expand with heat and contract with cold, may inside cable insulation, formed and split inside cable body and cable accessory medium interface, cable accessory
The cable actual motion service life is shortened in line or micropore, accelerated material aging.Above-mentioned phenomenon is deriving from new energy (such as wind energy, the sun
Can) electric energy transmitting scene in cable and cable accessory become apparent:, may in one day due to the randomness of generation of electricity by new energy
Multiple load fluctuation occurs, caused by thermal shock it is more frequent and severe compared with other application occasion；Above-mentioned phenomenon is to cause to be used for
One of the main reason for cable system failure is high-incidence in electric energy transmission based on new energy.
Currently, it is used for the main acoustic emission method of monitoring method and Electromagnetic coupling method of cable accessory shelf depreciation, correlation prison
Survey method is mostly disposed about sensor (such as uhf sensor, High Frequency Current Sensor, ultrasonic sensor) in cable accessory
To measure the local discharge signal occurred in electric cable fitting, and the pulse train (Phase offered an explanation by phase
Resolved Pluse Sequence, is abbreviated as PRPS), phase explanation shelf depreciation (Phase Resolved Partial
Discharge is abbreviated as PRPD) the methods of map analysis state of insulation and variation tendency.The primary limitation of the above monitoring method
Property be sensor covering band limits it is limited, generally between 300kHz to 300MHz, and at the beginning of cable accessory shelf depreciation
The frequency range of beginning signal is not often within the scope of this, and when detecting shelf depreciation in aforementioned manners, cable accessory is often
Be developed to can not service mode, therefore, the above method is typically only capable to prevent in Partial Discharge Detection/monitoring target of cable system
Model is because of fault spread caused by shelf depreciation reason；Meanwhile the above method also has ignored shelf depreciation and cable running conditions
Between relationship, for cable run frequent for load variations, the information of above-mentioned monitoring method is sufficiently complete；These are led
Cause the accuracy of Partial Discharge Detection low.
Utility model content
In view of this, the utility model embodiment provides a kind of cable accessory partial discharge monitoring device, method, terminal
And readable storage medium storing program for executing, to solve the problems, such as that cable accessory Partial Discharge Detection accuracy is low in the prior art.
For this purpose, the utility model embodiment provides following technical solution:
The utility model embodiment is in a first aspect, provide a kind of cable accessory partial discharge monitoring device, comprising: detection
Module and host computer, wherein
The detection module be set on cable accessory and/or ground wire return wire on, for local discharge signal carry out
Detection, the detection module include polarization light unit, Fibre Optical Sensor unit and luminous intensity measurement unit；
The polarization light unit is used to form polarised light group, and the polarised light group includes at least two polarised lights, will be described
The light intensity value of the polarised light of light unit output end is polarized as the first light intensity value；
The Fibre Optical Sensor unit is connect with the polarization light unit, the polarization being used for transmission in the polarised light group
Light；
The luminous intensity measurement unit is connect with the Fibre Optical Sensor unit, for after the Fibre Optical Sensor unit
The polarised light in the polarised light group carries out coherent superposition, by the polarised light of the luminous intensity measurement unit output end
Light intensity value is as the second light intensity value；
The host computer is connect with the detection module, for according to first light intensity value and second light intensity value
Obtain Partial Discharge Detection result.
Optionally, the detection module further include: phase modulation unit is connect with the polarization light unit, and with it is described
Fibre Optical Sensor unit connection, for the polarised light phase difference in the polarised light group to be modulated to preset value.
Optionally, when the polarised light group includes two polarised lights, the preset value is 90 degree.
Optionally, the Fibre Optical Sensor unit spiral is set on the lateral wall of the cable accessory；And/or spiral is set
It is placed on the lateral wall of the ground wire return wire.
Optionally, the number of turns for the Fibre Optical Sensor unit that the sensitivity of the detection module is arranged according to spiral determines.
Optionally, the polarization light unit is connect by optical fiber with the Fibre Optical Sensor unit；And/or the light intensity is surveyed
Amount unit is connect by optical fiber with the Fibre Optical Sensor unit.
Optionally, the cable accessory is transition joint and/or terminal fitting.
Optionally, further includes: hub is connect with the detection module, and is connect with the host computer, for collecting
It states detection module output valve and the output valve is sent to the host computer.
Optionally, further includes: photoelectric conversion module is connect with the detection module, and is connect with the host computer, is used for
First light intensity value and second light intensity value are respectively converted into the first value of electrical signals and the second value of electrical signals, it is described upper
Machine is also used to obtain Partial Discharge Detection result according to first value of electrical signals and second value of electrical signals.
The utility model embodiment second aspect provides cable accessory partial discharge monitoring method, includes the following steps:
Obtain the first light intensity value and the second light intensity value；Wherein, first light intensity value is that light unit output end is polarized in detection module
Polarised light light intensity value, second light intensity value be the detection module in luminous intensity measurement unit output end the polarised light
Light intensity value, the detection module be set on cable accessory and/or ground wire return wire on；According to first light intensity value and institute
It states the second light intensity value and obtains Partial Discharge Detection result.
Optionally, the step of Partial Discharge Detection result being obtained according to first light intensity value and second light intensity value
In, comprising: calculate the difference of first light intensity value and second light intensity value；Partial Discharge Detection is obtained according to the difference
As a result.
Optionally, in the step of calculating the difference of first light intensity value and second light intensity value, comprising: by described the
One light intensity value is converted to the first value of electrical signals, and second light intensity value is converted to the second value of electrical signals；Calculate first telecommunications
Number value and second value of electrical signals difference.
Optionally, in the step of obtaining Partial Discharge Detection result according to the difference, comprising: calculated according to the difference
The change rate of the difference；Partial Discharge Detection result is obtained according to the change rate.
The utility model embodiment third aspect provides a kind of terminal, comprising: at least one processor；And with institute
State the memory of at least one processor communication connection；Wherein, be stored with can be by least one described processor for the memory
The instruction of execution, described instruction are executed by least one described processor, so that the execution of at least one described processor is originally practical
Any method in new embodiment second aspect.
The utility model embodiment fourth aspect provides a kind of computer readable storage medium, is stored thereon with calculating
The step of machine instruction, which realizes any the method in the utility model embodiment second aspect when being executed by processor.
The utility model embodiment technical solution, has the advantages that
Cable accessory partial discharge monitoring device, method, terminal and readable storage medium provided by the embodiment of the utility model
Matter, wherein the device includes: detection module and host computer, wherein the detection module is set on cable accessory and/or ground wire
On return wire, for being detected to local discharge signal, the detection module include polarization light unit, Fibre Optical Sensor unit with
And luminous intensity measurement unit；The polarization light unit, is used to form polarised light group, and the polarised light group includes at least two polarizations
Light, using the light intensity value of the polarised light of the polarization light unit output end as the first light intensity value；The Fibre Optical Sensor unit
It is connect with the polarization light unit, the polarised light being used for transmission in the polarised light group；The luminous intensity measurement unit and institute
State Fibre Optical Sensor unit connection, for the polarised light in the polarised light group after the Fibre Optical Sensor unit into
Row coherent superposition, using the light intensity value of the polarised light of the luminous intensity measurement unit output end as the second light intensity value；On described
Position machine, connect with the detection module, for obtaining shelf depreciation inspection according to first light intensity value and second light intensity value
Survey result.Detection module is set on cable accessory and ground wire return wire, and detection module utilizes Faraday magnetooptical effect principle pair
The shelf depreciation of cable accessory is detected, the local discharge signal being able to detect that in bigger frequency range, and can be real-time
Shelf depreciation situation is monitored, the accuracy of Partial Discharge Detection is improved.
Detailed description of the invention
It, below will be right in order to illustrate more clearly of specific embodiment of the present invention or technical solution in the prior art
Specific embodiment or attached drawing needed to be used in the description of the prior art are briefly described, it should be apparent that, it is described below
In attached drawing be that some embodiments of the utility model are not paying creativeness for those of ordinary skill in the art
Under the premise of labour, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is showing according to a specific example of the cable accessory partial discharge monitoring device of the utility model embodiment
It is intended to；
Fig. 2 is another specific example according to the cable accessory partial discharge monitoring device of the utility model embodiment
Schematic diagram；
Fig. 3 is the stream according to a specific example of the cable accessory partial discharge monitoring method of the utility model embodiment
Cheng Tu；
Fig. 4 be according to the cable accessory partial discharge monitoring method of the utility model embodiment according to the first light intensity value and
Second light intensity value obtains the flow chart of a specific example of Partial Discharge Detection result；
Fig. 5 be according to the cable accessory partial discharge monitoring method of the utility model embodiment according to the first light intensity value and
Second light intensity value obtains the flow chart of another specific example of Partial Discharge Detection result；
Fig. 6 is the hardware structural diagram of terminal provided by the embodiment of the utility model.
Appended drawing reference:
1, detection module；11, light unit is polarized；12, Fibre Optical Sensor unit；13, luminous intensity measurement unit；14, phase-modulation
Unit；2, host computer；3, cable accessory；4, ground wire return wire；6, optical fiber；7, photoelectric conversion module；8, hub.
Specific embodiment
The technical solution of the utility model is clearly and completely described below in conjunction with attached drawing, it is clear that described
Embodiment is the utility model a part of the embodiment, instead of all the embodiments.Based on the embodiments of the present invention, originally
Field those of ordinary skill every other embodiment obtained without making creative work belongs to practical
Novel protected range.
It is in the description of the present invention, it should be noted that term " center ", "upper", "lower", "left", "right", " perpendicular
Directly ", the orientation or positional relationship of the instructions such as "horizontal", "inner", "outside" is to be based on the orientation or positional relationship shown in the drawings, and is only
For ease of description the utility model and simplify description, rather than the device or element of indication or suggestion meaning must have it is specific
Orientation, be constructed and operated in a specific orientation, therefore should not be understood as limiting the present invention.In addition, term " the
One ", " second ", " third " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " is pacified
Dress ", " connected ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integrally
Connection；It can be mechanical connection, be also possible to be electrically connected；Can be directly connected, can also indirectly connected through an intermediary,
It can also be the connection inside two elements, can be wireless connection, be also possible to wired connection.For the common skill of this field
For art personnel, the concrete meaning of above-mentioned term in the present invention can be understood with concrete condition.
In addition, as long as technical characteristic involved in the utility model different embodiments disclosed below is each other
Not constituting conflict can be combined with each other.
A kind of cable accessory partial discharge monitoring device is provided in the utility model embodiment, in cable system installation
Or be arranged on cable accessory reinforced insulation and on ground wire return wire later, realize the partial discharge monitoring to cable accessory,
As shown in Figure 1, the partial discharge monitoring device includes: detection module 1 and host computer 2, wherein
Detection module 1 be set on cable accessory 3 and ground wire return wire 4 on, for being detected to local discharge signal,
Detection module 1 includes polarization light unit 11, Fibre Optical Sensor unit 12 and luminous intensity measurement unit 13.In the present embodiment, cable
Attachment 3 includes transition joint and terminal fitting；It certainly, in other embodiments, can also only include transition joint, as needed
Rationally setting.
Light unit 11 is polarized, polarised light group is used to form, polarised light group includes at least two polarised lights, will polarize light unit
The light intensity value of the polarised light of 11 output ends is as the first light intensity value.In the present embodiment, polarised light group includes two polarised lights, when
So, in other embodiments, polarised light group also may include three even more polarised lights, and polarised light number is more, detection
Sensitivity it is higher, as needed rationally setting.In the present embodiment, since laser has been in most cases polarization
Light, in order to reduce production cost, polarization light unit 11 is laser, and certainly, in other embodiments, polarization light unit 11 can also be with
Using ordinary light source and the polarizer, the polarizer can be polarizing film or Nicol prism etc., and the polarizer is used to turn ordinary light source
It is changed to polarised light, as needed rationally setting.In the present embodiment, made using the lower laser light source of opposite acquisition cost
For first light source and second light source, first light source as the first polarised light, second light source as the second polarised light, first light source and
The output wavelength preferred scope of second light source is 635nm to 660nm, and preferred value is 650nm, other wave-length coverages also not by
Limitation, reality in the middle can be according to cost preferred wavelength ranges.First light source and the setting of the output intensity maximum value of second light source
For 0.005 watt (to meet safe laser power, guaranteeing that input light intensity does not cause to damage to human body and other equipment), light intensity value
Measurement range it is unrestricted.Light intensity defines the time average of generally luminous energy current density, and unit is consistent with energy-flux density, i.e.,
The energy of unit area is flowed through in unit time, unit is watt/square metre (w/m2).It is strong using optical detector exploring laser light
Degree often all receives all power detected in section, is generally the laser power measured.Due to laser beam radially light
It is unevenly distributed by force, it, can be with the optical power measured divided by laser sectional area if seeking the average intensity for cutting inner face.Due to most
Laser light source is therefore point light source generally also uses energy unit's -- watt -- to characterize light intensity in number situation.Currently, international
On think that power in 0.005 watt of laser below is safe light intensity (from U.S.'s food and drug safety management bureau FDA), no
It can cause harm to the human body.
In the present embodiment, the first light can be calculated according to the input light intensity value of the first polarised light and the second polarised light
Intensity values, such as light intensity value of the first polarised light are 0.003 watt, and the light intensity value of the second polarised light is 0.004 watt, due to the two
Angle is 90 degree, then its value is 0.005 watt after the first light intensity value is computed.
Fibre Optical Sensor unit 12 is connect with polarization light unit 11, the polarised light being used for transmission in polarised light group.In this implementation
In example, 12 spiral of Fibre Optical Sensor unit is set on the lateral wall of cable accessory 3 and spiral is set to the outside of ground wire return wire 4
On wall, spiral is arranged so that the arrangement of Fibre Optical Sensor unit 12 is more regular and detection effect is more excellent；Certainly, in other embodiments
In, the winding of Fibre Optical Sensor unit 12 or other forms, as the concentric circles increase of analogous cable pallet canoe twines
It is wound around diameter mode, the beginning and end trend for winding shape is consistent with the trend of Induced magnetic field, to guarantee to pass through wherein
Light it is consistent with the direction of Induced magnetic field.The number of turns for the Fibre Optical Sensor unit 12 that the sensitivity of detection module 1 is arranged according to spiral
It determines, more around the number of turns, sensitivity is higher, and in the present embodiment, the preferred scope around the number of turns is 20-50, and preferred value is
30, the selected principle of the number of turns is advisable with the outer contour for surrounding/wrapping up semiconductive stress cone, as needed rationally setting.
In the present embodiment, Fibre Optical Sensor unit 12 is full-fiber sensor；Certainly, in other embodiments, or optical fiber, only
It is capable of forming light conductive loop.
Luminous intensity measurement unit 13 is connect with Fibre Optical Sensor unit 12, for the polarised light after Fibre Optical Sensor unit 12
Polarised light in group carries out coherent superposition, using the light intensity value of the polarised light of 13 output end of luminous intensity measurement unit as the second light intensity
Value.In the present embodiment, luminous intensity measurement unit 13 is light power meter, and the second light intensity value can directly be measured by light power meter
It arrives；Certainly, in its embodiment, luminous intensity measurement unit 13 or polarised light angle measuring unit, such as analyzer are first detected
To polarised light angle, then according to the input light intensity value of polarised light angle, the first polarised light and the second polarised light detected, meter
Calculation obtains the second light intensity value.
The range of second light intensity value determines by the size of the first polarised light and the input light intensity value of the second polarised light, such as first
The light intensity value of polarised light is 0.003 watt and the light intensity value of the second polarised light is 0.004 watt, then the minimum value of the second light intensity value
Subtract each other (two polarised light angles are 180 degree) for the first polarised light and the second polarised light light intensity value, maximum value is the first polarised light
It is added with the second polarised light light intensity value (two polarised light angles are 0 degree), therefore the range of the second light intensity value is 0.001~0.007
Watt.
Host computer 2 is connect with detection module 1, for obtaining shelf depreciation inspection according to the first light intensity value and the second light intensity value
Survey result.When having leakage current to flow through on cable accessory or on ground wire return wire, leakage current forms magnetic field, and two polarised lights pass through
Angle can be not equal to 90 degree after Fibre Optical Sensor unit 12, then the second light intensity value after the synthesis of luminous intensity measurement unit 13 is not equal to the
One light intensity value；And with the increase of leakage current, the difference of the second light intensity value and the first light intensity value is also bigger therewith, shelf depreciation
It is more serious.When having leakage current to flow through on cable accessory or on ground wire return wire, the second light intensity value is equal to the first light intensity value.
Detection module is arranged on cable accessory and ground wire return wire in above-mentioned cable accessory partial discharge monitoring device, inspection
It surveys module to detect using shelf depreciation of the Faraday magnetooptical effect principle to cable accessory, is able to detect that bigger frequency model
Enclose interior local discharge signal, and can real-time monitoring shelf depreciation situation, improve the accuracy of Partial Discharge Detection.
On the basis of the above embodiments, for the ease of adjusting the phase angle between polarised light, as shown in Fig. 2, detection mould
Block 1 further includes phase modulation unit 14, is connect with polarization light unit 11, and connect with Fibre Optical Sensor unit 12, for that will polarize
Polarised light phase difference in light group is modulated to preset value.In the present embodiment, phase modulation unit 14 is phase-modulator, polarization
Light group includes two polarised lights, sets 90 degree for preset value for the ease of control, certainly, in other embodiments, preset value
It may be set to be other values, such as 60 degree, as needed rationally setting.
In the present embodiment, as shown in Fig. 2, polarization light unit 11 is connect by optical fiber 6 with Fibre Optical Sensor unit 12, light intensity
Measuring unit 13 is connect by optical fiber 6 with Fibre Optical Sensor unit 12, so that installation is more flexible convenient；Certainly, other
It in embodiment, can also be directly connected to, as needed rationally setting.
On the basis of the above embodiments, as shown in Fig. 2, due to the processing to electric signal is more convenient and accuracy more
Height, partial discharge monitoring device further include photoelectric conversion module 7, are connect with detection module 1, and connect with host computer 2, and being used for will
First light intensity value and the second light intensity value are respectively converted into the first value of electrical signals and the second value of electrical signals, and host computer 2 is also used to basis
First value of electrical signals and the second value of electrical signals obtain Partial Discharge Detection result.In the present embodiment, photoelectric conversion module 7 is light
Electric transducer, the first value of electrical signals and the second value of electrical signals are voltage value, and such as the first light intensity value is 0.004 the first electricity of watt-hour
Signal value is 4 volts, and the second light intensity value is 0.005 watt-hour, and the second value of electrical signals is 5 volts；Certainly, in other embodiments
In, it may be set to be current value, as needed rationally setting.
Due to 3 more and dispersed distributions of number of cable accessory in cable system, in order to save production cost, convenient for collection
Signal on each position is simultaneously uploaded to host computer 2, on the basis of the above embodiments, as shown in Fig. 2, partial discharge monitoring fills
Setting further includes hub 8, is connect with detection module 1, and is connect with host computer 2, for collecting 1 output valve of detection module and will be defeated
Value is sent to host computer 2 out.
Above-mentioned partial discharge monitoring device, according to magneto-optic effect principle, in cable accessory reinforced insulation outer side spiral cloth
Full-fiber sensor is set, introducing/lead-out wire is set；Spiral-shaped arrangement all -fiber is also pressed on the ground wire return wire of cable system
Sensor, equally setting introducing/lead-out wire；Introducing/lead-out wire at cable accessory reinforced insulation is respectively connected to polarized light source
Side and polarised light receiving side, polarised light source include polarization light unit, and polarised light receiving side includes luminous intensity measurement unit, at signal
Reason system, hub, upper host.The partial discharge monitoring device is in ground potential, and arrangement is convenient.
When cable system is installed or the full-fiber sensor and ground wire that are arranged on cable accessory reinforced insulation later are returned
The main function of full-fiber sensor on streamline is to form polarization optical channel.According to Faraday magnetooptical effect principle, by laser
The phase modulated device of the light of sending is divided into the polarised light that two polarization axles differ 90 ° after completing modulation, is transmitted through the fiber to complete
Fibre optical sensor, two beam polarised lights are transmitted through the fiber to luminous intensity measurement unit again later, and phase is carried out in luminous intensity measurement unit
Dry superposition, superimposed signal are sent into signal processing system and carry out signal processing.When there is no current flowing, two beams in cable conductor
The relative propagation velocity of polarised light in a fiber is equal, and the light detected in luminous intensity measurement unit at this time is in coherent superposition
There is no phase difference.When having electric current to flow through in cable conductor, Induced magnetic field is formed around conductor, under this magnetic fields, is led to
The relative velocity for crossing two beam polarised lights of full-fiber sensor changes, and light forms phase difference, so as to cause luminous intensity measurement
The light intensity being superimposed in unit changes.
The working principle of above-mentioned partial discharge monitoring device is specific as follows:
When cable accessory works normally, i.e., there is no shelf depreciation in cable accessory, electricity when cable transmission electric energy
Cable conductor has electric current to flow through, and power frequency is consistent with the electric system attribute of cable, and power frequency (or power frequency containing low order) or direct current is presented
Characteristic, at this point, the light intensity changing value detected in luminous intensity measurement unit is stationary value.
When shelf depreciation occurs in cable insulation system, pulse current that Partial Discharge Sources generate or through cable conductor or
It flows out through ground wire return wire, shelf depreciation electric current or is superimposed upon in conductor current at this time, or directly form earth-current, including with
Lower both of these case: when local discharge current is superimposed upon on conductor, high-frequency pulse current is generated in the conductor, the high-frequency electrical pulses
Influenza gives birth to high frequency magnetic field, and the light intensity value detected at this time is variable quantity；When no current circulates in cable conductor, what earth-current generated
The light intensity that magnetic field causes two polarised lights for flowing through ground wire return wire full-fiber sensor to form phase difference, and detect at this time becomes
Change value nor stationary value.By principles above full-fiber sensor can be flowed through with equivalent detection in the way of detection light intensity changing value
Shelf depreciation generate shelf depreciation current signal.
Cable accessory partial discharge monitoring device provided by the embodiment of the utility model has the following characteristics that 1. monitoring device
It is formed and is optically isolated between cable accessory, the electromagnetic interference being subject to without usual partial discharge detecting system；2. due to only right
The current sense of full-fiber sensor is flowed through, external electromagnetic noise does not influence the local discharge signal recognition effect of the present apparatus；③
Due to without ferromagnetic material, there is no nonlinear problem caused by magnetic saturation effect in total system in sensor；4. theory can recognize institute
There is frequency range local discharge signal；5. alterating and direct current cable fittings system can be suitable for simultaneously；6. online, offline inspection can be suitable for simultaneously
Survey/monitoring system；7. detection accuracy is related with the deflection angle of polarised light after detection, usually to increase spiral winding shape
The circle number of fibre optical sensor.
A kind of cable accessory partial discharge monitoring method is additionally provided in the utility model embodiment, is applied to above-mentioned cable
In attachment partial discharge monitoring device, as shown in figure 3, the process includes the following steps:
S1: the first light intensity value and the second light intensity value are obtained；Wherein, the first light intensity value is polarised light list in detection module 1
The light intensity value of the polarised light of first 11 output ends, the second light intensity value are the polarization of 13 output end of luminous intensity measurement unit in detection module 1
The light intensity value of light, detection module 1 be set on cable accessory and/or ground wire return wire on.In the present embodiment, detection module 1
Be set on cable accessory and ground wire return wire on.
Polarizing light unit 11 includes the first laser and second laser that two angles are 90 degree, and first laser is as the first light
Source (i.e. the first polarised light), second laser will polarize the light of 11 output end of light unit as second light source (i.e. the second polarised light)
For intensity values as the first light intensity value, light source forms two polarised lights that phase difference is 90 degree after phase-modulator, passes through optical fiber
Polarised light is transmitted in full-fiber sensor, full-fiber sensor spiral is set on the lateral wall of cable accessory and ground wire returns
On the lateral wall of streamline, polarised light carries out polarised light in luminous intensity measurement unit 13 after full-fiber sensor and carries out relevant fold
Add, using the light intensity value of 13 output end of luminous intensity measurement unit as the second light intensity value.
S2: Partial Discharge Detection result is obtained according to the first light intensity value and the second light intensity value.
When cable accessory works normally, i.e., there is no shelf depreciation in cable accessory, electricity when cable transmission electric energy
Cable conductor has electric current to flow through, and power frequency is consistent with the electric system attribute of cable, and power frequency or DC characteristic is presented, and light intensity is surveyed at this time
The light intensity changing value detected in amount unit 13 is stationary value；When shelf depreciation occurs for cable accessory, what Partial Discharge Sources generated
Pulse current is flowed out through cable conductor or through ground wire return wire, shelf depreciation electric current or is superimposed upon in conductor current at this time,
Or earth-current is directly formed, the light intensity changing value detected under both of these case is unstable value.
As a kind of specific embodiment, above-mentioned steps S2 is as shown in Figure 4, comprising:
S21: the difference of the first light intensity value and the second light intensity value is calculated；
As a kind of specific embodiment, above-mentioned steps S21 is as shown in Figure 5, comprising:
S211: the first light intensity value is converted into the first value of electrical signals, the second light intensity value is converted to the second value of electrical signals.Pass through
Light intensity value is converted to corresponding value of electrical signals by photoelectric conversion module.
S212: the difference of the first value of electrical signals and the second value of electrical signals is calculated.
S22: Partial Discharge Detection result is obtained according to difference.
As a kind of specific embodiment, above-mentioned steps S22 is as shown in Figure 5, comprising:
S221: according to the change rate of difference calculating difference；
S222: Partial Discharge Detection result is obtained according to change rate.The relationship of change rate and discharge examination result such as changes
Rate is bigger, discharge more serious etc..
Through the above steps, contrasting detection module light intensity signal situation of change, detection module are arranged in cable accessory and ground
It detects on line return wire and using shelf depreciation of the Faraday magnetooptical effect principle to cable accessory, is changed according to light intensity
Situation can quickly and accurately determine partial discharge position and size, the shelf depreciation being able to detect that in bigger frequency range
Signal, and can real-time monitoring shelf depreciation situation, improve the accuracy of Partial Discharge Detection.
Pacify on the cable accessory (transition joint or terminal fitting) of the high substation of the ambient noises such as electromagnetic noise etc.
It fills the fibre optical sensor of screw arrangement and the Fibre Optical Sensor of screw arrangement is installed in the ground wire return-flow system of this cable accessory
Device；Use the optical fiber of cable system itself institute band or the optical fiber in addition arranged is as conducting system incoming fiber optic sensor；Conduction
Optical fiber connects optical signal processing unit (polarization light unit, luminous intensity measurement unit, photoelectric converter etc.), at optical signal processing unit
Data after reason are uploaded to host computer by hub；Due to the dispersed distribution characteristic of cable accessory, by each terminal fitting and
The data of transition joint pickup area acquisition are sent into host computer after hub concentration；Algorithm calculating is arranged in host computer to receive
Signal, assess the shelf depreciation state of monitored cable system.
Cable accessory partial discharge monitoring method provided by the embodiment of the utility model has the following characteristics that 1. attached in cable
It is proposed is detected using shelf depreciation of the magneto-optic formula method to cable insulation system in part (transition joint and terminal fitting)
Method.2. the position for the fibre optical sensor for proposing to apply in cable accessory according to magneto-optic effect principle (is herein arrangement
On the corresponding reinforced insulation of attachment stress cone).3. the sensitivity of fibre optical sensor is related to arrangement the number of turns of Helical Fiber.Change
The method for becoming sensor spiral the number of turns does not change the final effect of the utility model embodiment.4. this method can test simultaneously
It is used in room environmental and live high-noise environment.5. this method is suitable for and online and offline environment.6. the cloth of fibre optical sensor
Seated position and shape, the arrangement principle of fibre optical sensor are the high risk zone comprising shelf depreciation, cable external shield incision position (
Current potential) be cable accessory high-risk area.In the present embodiment, fibre optical sensor is arranged in the reinforced insulation of covering attachment stress cone
On, the arrangement for allowing for fibre optical sensor does not influence stress cone production, attachment installation, and fibre optical sensor arrangement and wiring are drawn
It is convenient.Its concrete shape is related to the concrete shape of attachment.Therefore, as long as fibre optical sensor is arranged on the outside of reinforced insulation
Method be regarded as being further change in and improving for the utility model embodiment.
A kind of terminal is additionally provided in the utility model embodiment, as shown in Figure 6, comprising: at least one processor 601,
Such as CPU (Central Processing Unit, central processing unit), at least one communication interface 603, memory 604, until
A few communication bus 602.Wherein, communication bus 602 is for realizing the connection communication between these components.Wherein, communication connects
Mouth 603 may include display screen (Display), keyboard (Keyboard), and optional communication interface 603 can also include having for standard
Line interface, wireless interface.Memory 604 can be high speed RAM memory (Ramdom Access Memory, effumability with
Machine accesses memory), it is also possible to non-labile memory (non-volatile memory), for example, at least a disk
Memory.Memory 604 optionally can also be that at least one is located remotely from the storage device of aforementioned processor 601.Wherein locate
Cable accessory partial discharge monitoring device described in Fig. 1 and Fig. 2 can be combined by managing device 601, store one group of journey in memory 604
Sequence code, and processor 601 calls the program code that stores in memory 604, locally to be put for executing a kind of cable accessory
Pyroelectric monitor method, i.e., for executing such as the cable accessory partial discharge monitoring method in Fig. 3-Fig. 5 embodiment.
Wherein, communication bus 602 can be Peripheral Component Interconnect standard (peripheral component
Interconnect, abbreviation PCI) bus or expanding the industrial standard structure (extended industry standard
Architecture, abbreviation EISA) bus etc..Communication bus 602 can be divided into address bus, data/address bus, control bus etc..
Only to be indicated with a thick line in Fig. 6, it is not intended that an only bus or a type of bus convenient for indicating.
Wherein, memory 604 may include volatile memory (English: volatile memory), such as arbitrary access
Memory (English: random-access memory, abbreviation: RAM)；Memory also may include nonvolatile memory (English
Text: non-volatile memory), for example, flash memory (English: flash memory), hard disk (English: hard disk
Drive, abbreviation: HDD) or solid state hard disk (English: solid-state drive, abbreviation: SSD)；Memory 604 can also wrap
Include the combination of the memory of mentioned kind.
Wherein, processor 601 can be central processing unit (English: central processing unit, abbreviation:
CPU), the combination of network processing unit (English: network processor, abbreviation: NP) or CPU and NP.
Wherein, processor 601 can further include hardware chip.Above-mentioned hardware chip can be specific integrated circuit
(English: application-specific integrated circuit, abbreviation: ASIC), programmable logic device (English:
Programmable logic device, abbreviation: PLD) or combinations thereof.Above-mentioned PLD can be Complex Programmable Logic Devices
(English: complex programmable logic device, abbreviation: CPLD), field programmable gate array (English:
Field-programmable gate array, abbreviation: FPGA), Universal Array Logic (English: generic array
Logic, abbreviation: GAL) or any combination thereof.
Optionally, memory 604 is also used to store program instruction.Processor 601 can be instructed with caller, be realized such as this
Apply for cable accessory partial discharge monitoring method shown in Fig. 3-Fig. 5 embodiment.
A kind of computer readable storage medium is also provided in the utility model embodiment, is deposited on computer readable storage medium
Computer executable instructions are contained, which can be performed the cable accessory office in above-mentioned any means embodiment
Portion's electric discharge monitoring method.Wherein, the storage medium can be magnetic disk, CD, read-only memory (Read-Only
Memory, ROM), random access memory (Random Access Memory, RAM), flash memory (Flash
Memory), hard disk (Hard Disk Drive, abbreviation: HDD) or solid state hard disk (Solid-State Drive, SSD) etc.；Institute
State the combination that storage medium can also include the memory of mentioned kind.
It should be understood by those skilled in the art that, the embodiments of the present invention can provide as method, system or computer
Program product.Therefore, the utility model can be used complete hardware embodiment, complete software embodiment or combine software and hardware
The form of the embodiment of aspect.Moreover, it wherein includes computer available programs that the utility model, which can be used in one or more,
Implement in the computer-usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) of code
The form of computer program product.
The utility model is produced referring to according to the method, equipment (system) and computer program of the utility model embodiment
The flowchart and/or the block diagrams of product describes.It should be understood that can be realized by computer program instructions in flowchart and/or the block diagram
Each flow and/or block and flowchart and/or the block diagram in process and/or box combination.It can provide these meters
Calculation machine program instruction is to the place of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices
Device is managed to generate a machine, so that producing by the instruction that computer or the processor of other programmable data processing devices execute
Life is for realizing the function of specifying in one or more flows of the flowchart and/or one or more blocks of the block diagram
Device.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
Obviously, the above embodiments are merely examples for clarifying the description, and does not limit the embodiments.It is right
For those of ordinary skill in the art, can also make on the basis of the above description it is other it is various forms of variation or
It changes.There is no necessity and possibility to exhaust all the enbodiments.And it is extended from this it is obvious variation or
It changes among the protection scope created still in the utility model.
Claims (9)
1. a kind of cable accessory partial discharge monitoring device characterized by comprising detection module and host computer, wherein
The detection module be set on cable accessory and/or ground wire return wire on, for being detected to local discharge signal,
The detection module includes polarization light unit, Fibre Optical Sensor unit and luminous intensity measurement unit；
The polarization light unit is used to form polarised light group, and the polarised light group includes at least two polarised lights, by the polarization
The light intensity value of the polarised light of light unit output end is as the first light intensity value；
The Fibre Optical Sensor unit is connect with the polarization light unit, the polarised light being used for transmission in the polarised light group；
The luminous intensity measurement unit is connect with the Fibre Optical Sensor unit, for described in after the Fibre Optical Sensor unit
The polarised light in polarised light group carries out coherent superposition, by the light intensity of the polarised light of the luminous intensity measurement unit output end
Value is used as the second light intensity value；
The host computer is connect with the detection module, for being obtained according to first light intensity value and second light intensity value
Partial Discharge Detection result.
2. cable accessory partial discharge monitoring device according to claim 1, which is characterized in that the detection module also wraps
It includes:
Phase modulation unit connect with the polarization light unit, and connect with the Fibre Optical Sensor unit, is used for the polarization
Polarised light phase difference in light group is modulated to preset value.
3. cable accessory partial discharge monitoring device according to claim 2, which is characterized in that when the polarised light group packet
When including two polarised lights, the preset value is 90 degree.
4. cable accessory partial discharge monitoring device according to claim 1, which is characterized in that the Fibre Optical Sensor unit
Spiral is set on the lateral wall of the cable accessory；And/or spiral is set on the lateral wall of the ground wire return wire.
5. cable accessory partial discharge monitoring device according to claim 4, which is characterized in that the spirit of the detection module
The number of turns for the Fibre Optical Sensor unit that sensitivity is arranged according to spiral determines.
6. -5 any cable accessory partial discharge monitoring device according to claim 1, which is characterized in that the polarised light
Unit is connect by optical fiber with the Fibre Optical Sensor unit；And/or the luminous intensity measurement unit is passed by optical fiber and the optical fiber
Feel unit connection.
7. -5 any cable accessory partial discharge monitoring device according to claim 1, which is characterized in that the cable is attached
Part is transition joint and/or terminal fitting.
8. -5 any cable accessory partial discharge monitoring device according to claim 1, which is characterized in that further include:
Hub is connect with the detection module, and is connect with the host computer, for collecting the detection module output valve simultaneously
The output valve is sent to the host computer.
9. -5 any cable accessory partial discharge monitoring device according to claim 1, which is characterized in that further include:
Photoelectric conversion module is connect with the detection module, and is connect with the host computer, for will first light intensity value with
Second light intensity value is respectively converted into the first value of electrical signals and the second value of electrical signals, and the host computer is also used to according to described
One value of electrical signals and second value of electrical signals obtain Partial Discharge Detection result.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820229279.4U CN208239561U (en) | 2018-02-08 | 2018-02-08 | Cable accessory partial discharge monitoring device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820229279.4U CN208239561U (en) | 2018-02-08 | 2018-02-08 | Cable accessory partial discharge monitoring device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110350462A (en) * | 2019-06-24 | 2019-10-18 | 广西电网有限责任公司电力科学研究院 | A kind of intelligent lightning protecting distribution line shaft tower |
| CN114200272A (en) * | 2022-02-17 | 2022-03-18 | 山东汇能电气有限公司 | Switch cabinet health state operation feedback system based on partial discharge detection |
-
2018
- 2018-02-08 CN CN201820229279.4U patent/CN208239561U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110350462A (en) * | 2019-06-24 | 2019-10-18 | 广西电网有限责任公司电力科学研究院 | A kind of intelligent lightning protecting distribution line shaft tower |
| CN114200272A (en) * | 2022-02-17 | 2022-03-18 | 山东汇能电气有限公司 | Switch cabinet health state operation feedback system based on partial discharge detection |
| CN114200272B (en) * | 2022-02-17 | 2022-04-26 | 山东汇能电气有限公司 | Switch cabinet health state operation feedback system based on partial discharge detection |
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