Based on capacitance sensor type switch cabinet partial discharge on-line monitoring system and method
Technical field
The present invention relates to one kind to be based on capacitance sensor type switch cabinet partial discharge on-line monitoring system and method, belongs to electric power skill
Art field.
Background technology
In recent years, switch cubicle application is more and more wider in power system, the deficiency of switch cubicle field testing procedure and puts into operation
Electric power accident quantity caused by the deterioration of switch cubicle insulation characterisitic rises year by year, and serious threat the safe operation of power system, most
Power supply quality and power supply reliability are influenceed eventually.
According to statistics, cause in the factor that switch cubicle insulation characterisitic deteriorates, the deterioration as caused by shelf depreciation accounts for 85%.Cause
How this, effectively find the shelf depreciation of switch cubicle, detects that potential insulation fault turns into power monitoring department increasingly in time
It is concerned about simultaneously urgent problem to be solved, and currently associated mechanism and the focus of scientific and technical personnel's research.
In switch cubicle insulation system, the electric-field intensity at each position has differences, and the electric-field intensity in some region once reaches
During to its disruptive field intensity, the region will Discharge Phenomena, but through whole between applying alive two conductors
Discharge process, that is, discharge and do not puncture insulation system, this phenomenon is shelf depreciation.
Shelf depreciation is a kind of pulse phenomenon, and the process of shelf depreciation is except the transfer and the loss of electric energy along with electric charge
Outside, it can also produce electromagnetic radiation, ultrasound, light, generate heat and occur new product etc..Ultrasonic measurement and transient state low-voltage
Measure the measurement method for being namely based on these attendant phenomenons and summing up.
Transient state low-voltage method:In order to reduce equipment size, make structure compacter, switch cubicle manufacturing firm is switching at present
Substantial amounts of insulating materials is employed in the manufacture of cabinet, CT, PT, stationary contact head cartridge, wall bushing such as poured with epoxy resin and alternate
Dividing plate etc., if shelf depreciation be present inside these insulating materials, influenceed by skin effect, often instrument concentrates on current traveling wave
The inner surface of metal cabinet, without being directed through metal cabinet, the seam crossing or gas-insulated that fraction passes through metal shell
The pad of switch blazes abroad, while produces an instantaneous voltage-to-ground, passes to ground by the metal shell outer surface of equipment
Go down.The change of transient state voltage-to-ground can induce high frequency electric on the metal polar plate of sensor on switch cabinet shell body, to passing
The high frequency electric of sensor output is handled, and can obtain the intensity and frequency of shelf depreciation indirectly.This detection method is to arteries and veins
The pace of change of punching is more sensitive, is relatively adapted to the electric discharge of detection media interior.
Because electric discharge is moment, therefore partial discharge waveform is the pulse of a single, after electric discharge terminates, due to impurity electricity
The charge and discharge electro ultrafiltration of appearance, the vibration that waveform can pass through short time tend to be flat again, propose that one kind is based on electric capacity for this present invention
Sensor type switch cabinet partial discharge on-line monitoring system, the system uses obtains partial discharge letter at switch cabinet electrified indicator nuclear phase hole
Number, as long as partial discharge phenomenon occurs for a certain phase in switch cubicle, capacitance sensor will be coupled out partial discharge discharge current signal, pass through core
Phase hole can takes out the partial discharge discharge current signal of coupling indirectly, and now discharge pulse occurs in discharge current, utilizes pulse
Current method, and current spectrum method is combined, it can be diagnosed to be whether this mutually occurs partial discharge exactly, and the degree of partial discharge occurs,
A kind of Novel switch cabinet partial discharge on-Line Monitor Device feature is:So that the acquisition of Partial discharge signal becomes simple and easy, and measuring instrument
Device installation is simple, cost is low, it is not necessary to high sensor, is easy to partial discharge on-line monitoring to promote.
The content of the invention
The technical problems to be solved by the invention are, how using induction type capacitance sensor, the powered finger from switch cubicle
Show that device nuclear phase hole takes partial discharge monitoring signals, judge that switch cubicle produces partial discharge degree using pulse current method and Spectrum Method, realization is opened
The on-line monitoring of cabinet partial discharge is closed, to ensure that switch cubicle health and safety are run.
In order to solve the above technical problems, monitored on-line the invention provides one kind based on capacitance sensor type switch cabinet partial discharge
System, including A phase induction types capacitance sensor, B phase induction types capacitance sensor, C phase induction types capacitance sensor, A phases are powered
Display circuit, the powered display circuit of B phases, the powered display circuit of C phases, concentrated collection device, cloud service Surveillance center;The A phases are felt
Formula capacitance sensor, B phase induction types capacitance sensor, C phase induction type capacitance sensors is answered to be installed in switch cabinet outlet end, A
Phase induction type capacitance sensor, B phase induction types capacitance sensor, C phase induction type capacitance sensors output end respectively with A facies tracts
The input connection of electric display circuit, the powered display circuit of B phases, the powered display circuit of C phases, the powered display circuit of A phases, B facies tracts
Electric display circuit, the powered display circuit of C phases are arranged on the cabinet door-plate of switch cubicle;The powered display circuit of the A phases, B facies tracts
Electric display circuit, the nuclear phase hole of the powered display circuit of C phases are connected with concentrated collection device input respectively, and concentrated collection device is arranged on
On the cabinet door-plate of switch cubicle;The concentrated collection device is transmitted data by wired or wireless way with cloud service Surveillance center and believed
Breath, the cloud service Surveillance center are received and come from concentrated collection device partial discharge data, and the data of reception are analyzed, store, united
Meter, draws partial discharge spectrum curve, forms all kinds of statistical report forms.
Above-mentioned concentrated collection device includes A phase signals modulate circuit, B phase signals modulate circuit, C phase signals modulate circuit, deposited
Storing up electricity road, power circuit, high speed microprocessor circuit, display circuit, warning circuit, keyboard circuit, clock circuit, communication interface
Circuit;Partial discharge signal in the A phase signals modulate circuit is derived from A phase nuclear phases hole;Partial discharge signal in B phase signals modulate circuits
It is derived from B phase nuclear phases hole;Partial discharge signal in C phase signals modulate circuits is derived from C phase nuclear phases hole;The A phase signals modulate circuit, B
The input of phase signals modulate circuit, the output end of C phase signals modulate circuits respectively with high speed microprocessor circuit is connected;Storage
The output end of circuit is connected with the I/O mouths of high speed microprocessor circuit;The input of display circuit and high speed microprocessor circuit
I/O mouths connection;The input of warning circuit is connected with the I/O mouths of high speed microprocessor circuit;The output end of keyboard circuit with
The I/O mouths connection of high speed microprocessor circuit;The output end of clock circuit is connected with the I/O mouths of high speed microprocessor circuit;Electricity
The output end of source circuit is connected with the power end of high speed microprocessor circuit;Communication interface circuit and high speed microprocessor circuit
Port connects.
Above-mentioned display circuit includes electrification indicating circuit and A phase nuclear phases hole on powered display circuit, B phase nuclear phases
Hole, C phase nuclear phases hole, only need to be by inside three corresponding nuclear phase holes of measurement terminals insertion during measurement, so that it may obtain the partial discharge of tested phase
Current signal, due to being mounted on display circuit on switch cubicle, induction type capacitance sensor is as standard configuration device, so in office
Induction type capacitance sensor need not be separately installed when putting monitoring, the partial discharge letter of collection is directly obtained from display circuit nuclear phase hole
Number.
One kind is based on capacitance sensor type switch cabinet partial discharge on-line monitoring method, as follows using above-mentioned system, step:
(1), high speed microprocessor circuit the partial discharge information collected is handled using induction type capacitance sensor, obtain
Obtain the pulse current and pulse current spectrogram when partial discharge occurs;
(2), according to caused by whether pulse current method and pulse current Spectrum Method comprehensive descision occur partial discharge and partial discharge
Degree;
(3), when in switch cubicle somewhere occur partial discharge when, to low potential point produce continuous discharge phenomenon, so make originally mark
Accurate sinusoidal current signal is distorted, and is formed pulse current, and the current signal containing different frequency in electric current, is passed through analysis
Spectrogram frequency range, so that it may determine degree caused by inside switch cabinet partial discharge indirectly.
This kind of method directly obtains partial discharge measurement signal in the alive circuit nuclear phase hole due to utilizing high-tension switch cabinet installation,
With installing, simple, cost is low, it is not necessary to high sensor, the promotion and application for being easy to partial discharge to monitor on-line.
The beneficial effect that the present invention is reached:
System combines the actual conditions of China's switch cabinet partial discharge monitoring, using induction type capacitance sensor, from switch cubicle
Upper potential indicator nuclear phase hole takes partial discharge monitoring signals, judges that switch cubicle produces partial discharge journey using pulse current method and Spectrum Method
Degree, realize the on-line monitoring of switch cabinet partial discharge so that the acquisition of Partial discharge signal becomes simple and easy, and measuring instrument installation letter
List, cost are low, it is not necessary to high sensor, are easy to partial discharge on-line monitoring to promote.
Brief description of the drawings
Fig. 1 is the structural representation of present system;
Fig. 2 is the structural representation of concentrated collection device in Fig. 1.
Embodiment
The invention will be further described below in conjunction with the accompanying drawings.Following examples are only used for clearly illustrating the present invention
Technical scheme, and can not be limited the scope of the invention with this.
As shown in figure 1, a kind of be based on capacitance sensor type switch cabinet partial discharge on-line monitoring system, including A phases induction type electricity
Hold sensor, B phase induction types capacitance sensor, C phase induction types capacitance sensor, the powered display circuit of A phases, the powered display of B phases
Circuit, the powered display circuit of C phases, concentrated collection device, cloud service Surveillance center;The A phases induction type capacitance sensor, B phases are felt
Formula capacitance sensor, C phase induction type capacitance sensors is answered to be installed in switch cabinet outlet end, A phase induction types capacitance sensor, B
Phase induction type capacitance sensor, display circuit powered with A phases, B phases are powered aobvious respectively for the output end of C phase induction type capacitance sensors
Show the input connection of circuit, the powered display circuit of C phases, the powered display circuit of A phases, the powered display circuit of B phases, C phases are powered aobvious
Show that circuit is arranged on the cabinet door-plate of switch cubicle;The powered display circuit of the A phases, the powered display circuit of B phases, C phases are powered aobvious
Show that the nuclear phase hole of circuit is connected with concentrated collection device input respectively, concentrated collection device is arranged on the cabinet door-plate of switch cubicle;
The concentrated collection device and cloud service Surveillance center are by wired or wireless way transfer data information, in the cloud service monitoring
The heart is received and comes from concentrated collection device partial discharge data, and the data of reception are analyzed, store, counted, draw partial discharge spectrum curve,
Form all kinds of statistical report forms.
Adjusted as shown in Fig. 2 above-mentioned concentrated collection device includes A phase signals modulate circuit, B phase signals modulate circuit, C phase signals
Manage circuit, storage circuit, power circuit, high speed microprocessor circuit, display circuit, warning circuit, keyboard circuit, clock electricity
Road, communication interface circuit;Partial discharge signal in the A phase signals modulate circuit is derived from A phase nuclear phases hole;B phase signals modulate circuits
In Partial discharge signal be derived from B phase nuclear phases hole;Partial discharge signal in C phase signals modulate circuits is derived from C phase nuclear phases hole;The A believes
Number modulate circuit, B phase signals modulate circuit, the output end of C phase signals modulate circuits are defeated with high speed microprocessor circuit respectively
Enter end connection;The output end of storage circuit is connected with the I/O mouths of high speed microprocessor circuit;The input of display circuit and high speed
The I/O mouths connection of microcontroller circuit;The input of warning circuit is connected with the I/O mouths of high speed microprocessor circuit;Keyboard electricity
The output end on road is connected with the I/O mouths of high speed microprocessor circuit;The output end of clock circuit and high speed microprocessor circuit
I/O mouths connect;The output end of power circuit is connected with the power end of high speed microprocessor circuit;Communication interface circuit is micro- with high speed
The port connection of processor circuit.
Above-mentioned display circuit includes electrification indicating circuit and A phase nuclear phases hole on powered display circuit, B phase nuclear phases
Hole, C phase nuclear phases hole, only need to be by inside three corresponding nuclear phase holes of measurement terminals insertion during measurement, so that it may obtain the partial discharge of tested phase
Current signal, due to being mounted on display circuit on switch cubicle, induction type capacitance sensor is as standard configuration device, so in office
Induction type capacitance sensor need not be separately installed when putting monitoring, the partial discharge letter of collection is directly obtained from display circuit nuclear phase hole
Number.
One kind is based on capacitance sensor type switch cabinet partial discharge on-line monitoring method, as follows using above-mentioned system, step:
(1), high speed microprocessor circuit the partial discharge information collected is handled using induction type capacitance sensor, obtain
Obtain the pulse current and pulse current spectrogram when partial discharge occurs;
(2), according to caused by whether pulse current method and pulse current Spectrum Method comprehensive descision occur partial discharge and partial discharge
Degree;
(3), when in switch cubicle somewhere occur partial discharge when, to low potential point produce continuous discharge phenomenon, so make originally mark
Accurate sinusoidal current signal is distorted, and is formed pulse current, and the current signal containing different frequency in electric current, is passed through analysis
Spectrogram frequency range, so that it may determine degree caused by inside switch cabinet partial discharge indirectly.
This kind of method directly obtains partial discharge measurement signal in the alive circuit nuclear phase hole due to utilizing high-tension switch cabinet installation,
With installing, simple, cost is low, it is not necessary to high sensor, the promotion and application for being easy to partial discharge to monitor on-line.
Described above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, some improvement and deformation can also be made, these are improved and deformation
Also it should be regarded as protection scope of the present invention.