Based on capacitance sensor type switch cabinet partial discharge on-line monitoring system and method
Technical field
The present invention relates to a kind of based on capacitance sensor type switch cabinet partial discharge on-line monitoring system and method, belong to technical field of electric power.
Background technology
In recent years, the application of electric system breaker in middle cabinet is more and more wider, the electric power accident quantity that deficiency and the switch cubicle insulation characterisitic deterioration put into operation of switch cubicle field testing procedure cause rises year by year, and the safe operation of electric system in serious threat, finally affects power supply quality and power supply reliability.
According to statistics, cause in the factor of switch cubicle insulation characterisitic deterioration, the deterioration caused by shelf depreciation accounts for 85%.Therefore, how effectively to find the shelf depreciation of switch cubicle, detecting that potential insulation fault has become power monitoring department and has day by day been concerned about and problem demanding prompt solution in time, is also the focus of current associated mechanisms and scientific and technical personnel's research.
In switch cubicle insulation system, the electric field intensity at each position there are differences, the electric field intensity in certain region is once reach its breakdown field strength, this region will Discharge Phenomena, but execute between alive two conductors and do not run through whole discharge process, namely discharge and do not puncture insulation system, this phenomenon is shelf depreciation.
Shelf depreciation is a kind of pulse phenomenon, the process of shelf depreciation except along with except the transfer of electric charge and the loss of electric energy, also can produce electromagnetic radiation, ultrasonic, luminous, generate heat and occur new product etc.Ultrasonic measurement and transient state low-voltage measure the measurement way summed up based on these attendant phenomenons exactly.
Transient state low-voltage method: in order to reduce equipment size, make structure compacter, current switch cubicle manufacturing firm have employed a large amount of insulating material in the manufacture of switch cubicle, as the CT of poured with epoxy resin, PT, static contact box, wall bushing and phase partition etc., if there is shelf depreciation in these insulating material inside, by the impact of skin effect, current traveling wave often instrument concentrates on the inside surface of metal cabinet, and can not direct penetrating metal cabinet, fraction is blazed abroad by the seam crossing of metal shell or the liner of gas-insulated switch, produce an instantaneous voltage-to-ground simultaneously, gone down with passing to by the metal shell outside surface of equipment.On switch cabinet shell body, the change of transient state voltage-to-ground can induce high-frequency current on the metal polar plate of sensor, processes, indirectly can obtain intensity and the frequency of shelf depreciation to the high-frequency current that sensor exports.The pace of change of this detection method paired pulses is more responsive, is relatively applicable to the electric discharge detecting media interior.
Because electric discharge is moment, therefore the pulse that waveform is a single is put in office, after electric discharge terminates, due to the discharge and recharge effect of impurity electric capacity, waveform can be tending towards smooth again through the vibration of short time, the present invention proposes a kind of based on capacitance sensor type switch cabinet partial discharge on-line monitoring system for this reason, native system adopts and obtains Partial discharge signal from switch cabinet electrified indicator nuclear phase hole, as long as phenomenon is put in a certain office of generation mutually in switch cubicle, discharge current signal is put in the capacitive transducer striking out that will be coupled, discharge current signal is put in the office that just indirectly can be taken out coupling by nuclear phase hole, now discharge current there will be discharge pulse, utilize pulse current method, and in conjunction with current spectrum method, whether generation office puts can to diagnose out this phase exactly, and the degree that generation office puts, a kind of Novel switch cabinet office puts on-Line Monitor Device feature and is: make the acquisition of Partial discharge signal become simple, and surveying instrument is installed simple, cost is low, do not need high sensor, be convenient to office and put on-line monitoring popularization.
Summary of the invention
Technical matters to be solved by this invention is, how to adopt induction type capacitive transducer, from switch cubicle, monitor signal is put in the potential indicator nuclear phase hole office of getting, degree is put in switch cubicle generation office to utilize pulse current method and Spectrum Method to judge, realize the on-line monitoring of switch cabinet partial discharge, to ensure the healthy and safe operation of switch cubicle.
For solving the problems of the technologies described above, the invention provides a kind of based on capacitance sensor type switch cabinet partial discharge on-line monitoring system, comprise A phase induction type capacitive transducer, B phase induction type capacitive transducer, C phase induction type capacitive transducer, the charged display circuit of A phase, the charged display circuit of B phase, the charged display circuit of C phase, concentrated collection device, cloud service Surveillance center; Described A phase induction type capacitive transducer, B phase induction type capacitive transducer, C phase induction type capacitive transducer are installed in switch cabinet outlet end, the output terminal of A phase induction type capacitive transducer, B phase induction type capacitive transducer, C phase induction type capacitive transducer is connected with the input end of the charged display circuit of A phase, the charged display circuit of B phase, the charged display circuit of C phase respectively, and the charged display circuit of A phase, the charged display circuit of B phase, the charged display circuit of C phase are arranged on the cabinet door-plate of switch cubicle; The nuclear phase hole of the charged display circuit of described A phase, the charged display circuit of B phase, the charged display circuit of C phase is connected with concentrated collection device input end respectively, and concentrated collection device is arranged on the cabinet door-plate of switch cubicle; Described concentrated collection device and cloud service Surveillance center are by wired or wireless mode transfer data information, described cloud service Surveillance center receives and puts data from concentrated collection general ability, to the data analysis received, storage, statistics, spectrum curve is put in the office of drawing, and forms all kinds of statistical report form.
Above-mentioned concentrated collection device comprises A phase signals modulate circuit, B phase signals modulate circuit, C phase signals modulate circuit, memory circuit, power circuit, high speed microprocessor circuit, display circuit, warning circuit, keyboard circuit, clock circuit, communication interface circuit; Partial discharge signal in described A phase signals modulate circuit takes from A phase nuclear phase hole; Partial discharge signal in B phase signals modulate circuit takes from B phase nuclear phase hole; Partial discharge signal in C phase signals modulate circuit takes from C phase nuclear phase hole; The output terminal of described A phase signals modulate circuit, B phase signals modulate circuit, C phase signals modulate circuit is connected with the input end of high speed microprocessor circuit respectively; The output terminal of memory circuit is connected with the I/O mouth of high speed microprocessor circuit; The input end of display circuit is connected with the I/O mouth of high speed microprocessor circuit; The input end of warning circuit is connected with the I/O mouth of high speed microprocessor circuit; The output terminal of keyboard circuit is connected with the I/O mouth of high speed microprocessor circuit; The output terminal of clock circuit is connected with the I/O mouth of high speed microprocessor circuit; The output terminal of power circuit is connected with the power end of high speed microprocessor circuit; Communication interface circuit is connected with the communication port of high speed microprocessor circuit.
Above-mentioned display circuit comprises electrification indicating circuit and is arranged on A phase nuclear phase hole on charged display circuit, B phase nuclear phase hole, C phase nuclear phase hole, only three measurement terminal need be inserted corresponding nuclear phase hole during measurement inner, just can obtain office's discharge stream signal of tested phase, owing to being all provided with display circuit on switch cubicle, induction type capacitive transducer is as standard configuration device, do not need when monitoring is put in office like this induction type capacitive transducer is installed separately, from display circuit nuclear phase hole, directly obtain the Partial discharge signal of collection.
A kind of based on capacitance sensor type switch cabinet partial discharge on-line monitoring method, utilize above-mentioned system, step is as follows:
(1), high speed microprocessor circuit utilizes induction type capacitive transducer to process the office's information of putting collected, pulse current when generation is put in acquisition office and pulse current spectrogram;
(2), according to pulse current method and pulse current Spectrum Method comprehensive descision whether generation office to put and the degree of generation is put in office;
(3), when in switch cubicle, generation office in somewhere puts, continuous discharge phenomenon is produced to electronegative potential point, the sinusoidal current signal of standard is originally made to distort like this, form pulse current, and the current signal containing different frequency in electric current, by analysis spectrum figure frequency range, just indirectly can determine that the degree of generation is put in inside switch cabinet office.
This kind of method due to utilize high-tension switch cabinet to install alive circuit nuclear phase hole in directly acquisition office put measuring-signal, have install simple, cost is low, do not need high sensor, be convenient to the promotion and application that on-line monitoring is put in office.
The beneficial effect that the present invention reaches:
System combines the actual conditions of China's switch cabinet partial discharge monitoring, adopt induction type capacitive transducer, from switch cubicle, monitor signal is put in the potential indicator nuclear phase hole office of getting, degree is put in switch cubicle generation office to utilize pulse current method and Spectrum Method to judge, realize the on-line monitoring of switch cabinet partial discharge, make the acquisition of Partial discharge signal become simple, and surveying instrument is installed simply, cost is low, do not need high sensor, be convenient to office and put on-line monitoring popularization.
Accompanying drawing explanation
Fig. 1 is the structural representation of present system;
Fig. 2 is the structural representation of concentrated collection device in Fig. 1.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.Following examples only for technical scheme of the present invention is clearly described, and can not limit the scope of the invention with this.
As shown in Figure 1, a kind of based on capacitance sensor type switch cabinet partial discharge on-line monitoring system, comprise A phase induction type capacitive transducer, B phase induction type capacitive transducer, C phase induction type capacitive transducer, the charged display circuit of A phase, the charged display circuit of B phase, the charged display circuit of C phase, concentrated collection device, cloud service Surveillance center; Described A phase induction type capacitive transducer, B phase induction type capacitive transducer, C phase induction type capacitive transducer are installed in switch cabinet outlet end, the output terminal of A phase induction type capacitive transducer, B phase induction type capacitive transducer, C phase induction type capacitive transducer is connected with the input end of the charged display circuit of A phase, the charged display circuit of B phase, the charged display circuit of C phase respectively, and the charged display circuit of A phase, the charged display circuit of B phase, the charged display circuit of C phase are arranged on the cabinet door-plate of switch cubicle; The nuclear phase hole of the charged display circuit of described A phase, the charged display circuit of B phase, the charged display circuit of C phase is connected with concentrated collection device input end respectively, and concentrated collection device is arranged on the cabinet door-plate of switch cubicle; Described concentrated collection device and cloud service Surveillance center are by wired or wireless mode transfer data information, described cloud service Surveillance center receives and puts data from concentrated collection general ability, to the data analysis received, storage, statistics, spectrum curve is put in the office of drawing, and forms all kinds of statistical report form.
As shown in Figure 2, above-mentioned concentrated collection device comprises A phase signals modulate circuit, B phase signals modulate circuit, C phase signals modulate circuit, memory circuit, power circuit, high speed microprocessor circuit, display circuit, warning circuit, keyboard circuit, clock circuit, communication interface circuit; Partial discharge signal in described A phase signals modulate circuit takes from A phase nuclear phase hole; Partial discharge signal in B phase signals modulate circuit takes from B phase nuclear phase hole; Partial discharge signal in C phase signals modulate circuit takes from C phase nuclear phase hole; The output terminal of described A phase signals modulate circuit, B phase signals modulate circuit, C phase signals modulate circuit is connected with the input end of high speed microprocessor circuit respectively; The output terminal of memory circuit is connected with the I/O mouth of high speed microprocessor circuit; The input end of display circuit is connected with the I/O mouth of high speed microprocessor circuit; The input end of warning circuit is connected with the I/O mouth of high speed microprocessor circuit; The output terminal of keyboard circuit is connected with the I/O mouth of high speed microprocessor circuit; The output terminal of clock circuit is connected with the I/O mouth of high speed microprocessor circuit; The output terminal of power circuit is connected with the power end of high speed microprocessor circuit; Communication interface circuit is connected with the communication port of high speed microprocessor circuit.
Above-mentioned display circuit comprises electrification indicating circuit and is arranged on A phase nuclear phase hole on charged display circuit, B phase nuclear phase hole, C phase nuclear phase hole, only three measurement terminal need be inserted corresponding nuclear phase hole during measurement inner, just can obtain office's discharge stream signal of tested phase, owing to being all provided with display circuit on switch cubicle, induction type capacitive transducer is as standard configuration device, do not need when monitoring is put in office like this induction type capacitive transducer is installed separately, from display circuit nuclear phase hole, directly obtain the Partial discharge signal of collection.
A kind of based on capacitance sensor type switch cabinet partial discharge on-line monitoring method, utilize above-mentioned system, step is as follows:
(1), high speed microprocessor circuit utilizes induction type capacitive transducer to process the office's information of putting collected, pulse current when generation is put in acquisition office and pulse current spectrogram;
(2), according to pulse current method and pulse current Spectrum Method comprehensive descision whether generation office to put and the degree of generation is put in office;
(3), when in switch cubicle, generation office in somewhere puts, continuous discharge phenomenon is produced to electronegative potential point, the sinusoidal current signal of standard is originally made to distort like this, form pulse current, and the current signal containing different frequency in electric current, by analysis spectrum figure frequency range, just indirectly can determine that the degree of generation is put in inside switch cabinet office.
This kind of method due to utilize high-tension switch cabinet to install alive circuit nuclear phase hole in directly acquisition office put measuring-signal, have install simple, cost is low, do not need high sensor, be convenient to the promotion and application that on-line monitoring is put in office.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the technology of the present invention principle; can also make some improvement and distortion, these improve and distortion also should be considered as protection scope of the present invention.