CN2718591Y - Dielectric loss on-line monitoring device for capacitive electric equipment - Google Patents
Dielectric loss on-line monitoring device for capacitive electric equipment Download PDFInfo
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- CN2718591Y CN2718591Y CN 200420041921 CN200420041921U CN2718591Y CN 2718591 Y CN2718591 Y CN 2718591Y CN 200420041921 CN200420041921 CN 200420041921 CN 200420041921 U CN200420041921 U CN 200420041921U CN 2718591 Y CN2718591 Y CN 2718591Y
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Abstract
The utility model discloses a dielectric loss on-line monitoring device for capacitive electric equipment. The equipment earth connection is sheathed with high precision micro current sensor, and a resistance voltage divider is arranged on the low-voltage output of the substation voltage transformer. The dielectric loss on-line monitoring device for capacitive electric equipment makes use of computer to analyze, process and display the result, and realizes the signal online monitoring of the power equipment leakage current. The dielectric loss on-line monitoring device for capacitive electric equipment is composed of the high precision micro current sensor, the resistance voltage divider, a signal cable, a signal conditioner, a data collecting card, a digital IO card and a computer. The method and the device of the utility model can calibrate the phase excursion caused by the hardware according to the size of the equipment leakage current value, and charge off the abnormal value of measuring, and account the dielectric loss by spectrum analysis method and correlation method. The methods can guarantee the measuring accuracy, and the dielectric loss on-line monitoring device for capacitive electric equipment also accounts the mean square value of the power equipment leakage current. The dielectric loss on-line monitoring device for capacitive electric equipment realizes the data administration by ORACLE, and has the functions of history querying, report printing, thresholding alarming and remote querying.
Description
Technical Field
The invention belongs to the technical field of on-line monitoring of power equipment, and relates to a device for on-line monitoring of dielectric loss of capacitive power equipment.
Background
The rapid development of national economy further improves the requirements on the operation reliability of the power system, and the on-line monitoring technology of the power equipment is an important way for improving the operation reliability of the power. The capacitance type power equipment occupies a large proportion in a power transmission and transformation system, such as a transformer, a cable, a sleeve and the like, and the capacitance type power equipment is aged due to the action of factors such as electricity, heat, machinery, environment and the like in the operation process, so that the insulation performance is reduced, and the potential accident hazard is caused. The dielectric loss is an important insulation index for reflecting the insulation condition of the capacitive power equipment, the insulation aging condition of the power equipment can be effectively judged by monitoring the dielectric loss of the power equipment on line, and the method plays an important role in stable operation of the power equipment.
The medium loss detection device of the power equipment developed at home and abroad can be divided into two types, one type is off-line measurement, the device to be detected needs to be powered off when the device is used, and the device is suitable for preventive tests; and another live measurement, the measuring device can measure when the equipment is in normal operation. The traditional electric power equipment dielectric loss live measurement device takes a single chip microcomputer as an operation processing core, such as Chinese patent publication No. 1185585 and Chinese patent publication No. 2200823, and is limited by the function of the single chip microcomputer, so that the device has simpler function, does not have advanced data management capability and remote data query function, has poor digital signal processing capability and is difficult to filter out strong electromagnetic interference signals on site. Chinese patent publication No. 1188237 discloses a method and apparatus for live measurement of dielectric loss of capacitive electrical equipment, which uses the principle of balanced bridge and combined sampling of capacitance and resistance to improve measurement accuracy, but the apparatus needs manual adjustment and is not suitable for real-time automatic monitoring.
With the rapid development of national economy, the improvement of the electric power operation reliability is urgently required, and the traditional detection device taking the single chip microcomputer as a processing core is difficult to meet the increasingly high requirements of an electric power operation department on the automation level of equipment due to simple function and low automation level.
Disclosure of Invention
An object of the utility model is to provide a capacitive type power equipment on-line monitoring equipment's device adopts virtual instrument technique, has advantages such as measurement accuracy is high, the interface is friendly, powerful, automatic level height, can satisfy the urgent need of the automatic monitoring of capacitive type power equipment dielectric loss. By monitoring the dielectric loss of the capacitive power equipment on line, the insulation condition of the equipment can be reflected, insulation defects can be found in time, and potential fault hazards can be eliminated.
The technical scheme for realizing the aim is that the device of the capacitance type power equipment dielectric loss on-line monitoring method carries out signal transmission by a signal cable, and the device comprises:
the high-precision micro-current sensor is sleeved on a grounding wire of the equipment and is used for coupling a leakage current signal of the power equipment;
the signal conditioners are arranged in the monitoring room and used for amplifying, filtering, isolating and multiplexing signals of the high-precision micro-current sensor;
the resistance voltage divider is arranged at the transformer substation voltage transformer end and used for acquiring a reference voltage signal;
the data acquisition card is used for acquiring signals after the signal conditioner is subjected to amplification, filtering, signal isolation and multipath selection;
the digital IO card is used for controlling the signal conditioner, the gating of the data acquisition card channel, the gain adjustment and the filtering;
the computer is used for realizing data processing, result display, alarm and remote monitoring of the dielectric loss of the capacitive power equipment;
the high-precision micro-current sensor and the resistance voltage divider thereof sleeved on the ground wire of the equipment send signals into the data acquisition card through the control signal conditioner, the computer is respectively communicated with the data acquisition card and the digital IO card, and the digital IO card is also communicated with the control signal conditioner.
The invention has other characteristics that the high-precision micro-current sensor adopts a Rogowski coil current sensor and consists of an outer shielding box, a magnetic core, a coil, an integral resistor, a signal output plug and an amplifying circuit.
The magnetic core of the Rogowski coil current sensor is an annular slope film alloy magnetic core.
The integral resistance is 50 omega, and the characteristic impedance of the signal output plug is also 50 omega.
The resistive divider has A, B, C three phases, corresponding to A, B, C three phases of the power device.
The resistor voltage divider adopts high-power resistors connected in series to divide voltage, and the power is 4W.
The maximum real-time sampling rate of the data acquisition card is 20MS/s, the analog bandwidth is 15MHz, the A/D resolution is 8 bits, the input voltage range is-5V- +5V, and two analog signal input ends are provided.
The digital IO card is provided with three ports, 8 bits of each port form a control word, and the control word is written into each port to realize a control function.
The utility model discloses a virtual instrument's design thought, through gather integrated circuit board and the computer construct the collection and the analysis platform of device, have characteristics such as friendly, the computing function is strong at the interface. The utility model discloses can be used for on-line monitoring electric capacity type power equipment's dielectric loss and leakage current value, can calibrate the phase place skew of the difference that hardware circuit arouses according to leakage current value's size, can reject unusual result, realize the management of data through the ORACLE database, have historical data inquiry function, still have functions such as report printing, threshold value warning, remote query simultaneously.
Drawings
Fig. 1 is the schematic diagram of the structure of the present invention, and the data acquisition block digital IO card in fig. 1 is a PCI bus, and these two cards are all inserted into the PCI slot of the computer.
FIG. 2 is a schematic diagram of a sensor coil;
FIG. 3 is a schematic diagram of a resistor divider configuration (where R1 is 500k Ω and R2 is 2.5k Ω).
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1, the device of the method for monitoring dielectric loss of capacitive power equipment on line according to the present invention transmits signals through a signal cable, and the device includes:
the high-precision micro-current sensor 1 is sleeved on a grounding wire of the equipment and is used for coupling a leakage current signal of the power equipment;
the signal conditioners 2 are arranged in the monitoring room and are used for amplifying, filtering, isolating and multiplexing the signals of the high-precision micro-current sensor 1;
the resistance voltage divider 3 is arranged at the transformer substation voltage transformer end and used for acquiring a reference voltage signal;
the data acquisition card 4 is used for acquiring signals after the signal conditioner 2 is subjected to amplification, filtering, signal isolation and multipath selection;
the digital IO card 5 is used for controlling the channel gating, the gain adjustment and the filtering of the signal conditioner 2 and the data acquisition card 4;
the computer 6 is used for realizing data processing, result display, alarm and remote monitoring of the dielectric loss of the capacitive power equipment;
the data acquisition card 4 and the digital IO card 5 are both PCI buses, and both cards are inserted into PCI slots of the computer 6.
The high-precision micro-current sensor 1 sleeved on the ground wire of the equipment and the resistance voltage divider 3 thereof send signals into the data acquisition card 4 through the control signal conditioner 2, the computer 6 is respectively communicated with the data acquisition card 4 and the digital IO card 5, and the digital IO card 5 is also communicated with the control signal conditioner 2.
The high-precision micro-current sensor adopts a Rogowski coil current sensor and consists of an outer shielding box, a magnetic core, a coil, an integral resistor, a signal output plug and an amplifying circuit. The magnetic core is an annular slope film alloy magnetic core, and the specific size depends on the sectional area of a grounding wire of monitored equipment. The coil is wound by adopting an enameled wire (see fig. 2), and the number of turns depends on the magnitude of leakage current of equipment, and is generally 100-700 turns. The integrating resistance is 50 Ω, and the characteristic impedance of the signal output plug is also 50 Ω. The sensor is a shielding technology for inhibiting field interference, and the shielding materials from inside to outside are a slope film alloy film, an iron sheet film and a copper shielding box in sequence. The amplification circuit of the sensor adopts a multi-stage amplification technology, the total amplification factor is 105-107, and 4 orders are adjustable.
The resistor divider is used for dividing voltage from a voltage transformer (see fig. 3) and acquiring a voltage signal as phase reference information for analyzing the dielectric loss. The resistive divider has A, B, C three phases, corresponding to A, B, C three phases of the power device. The resistor voltage divider adopts high-power resistors which are connected in series for voltage division, the resistors are respectively 500k omega and 2.5k omega, and the power is 4W.
Calculating the angular difference between the two signals, wherein the specific implementation method is as follows; a leakage current signal of a high-precision micro-current sensor coupling device sleeved on a ground wire of the device is transmitted to a signal conditioner positioned in a monitoring room through a signal cable to be amplified, filtered, isolated, multiplexed and the like, then is sent to a first channel of a data acquisition card installed in a computer to be subjected to data acquisition, is sent to the signal conditioner to be isolated and the like after being transmitted through the signal cable, is sent to a second channel of the data acquisition card installed in the computer to be simultaneously acquired with the leakage current signal of the first channel, calculates the angular difference between the current signal and the voltage signal, and calculates the tangent value which is the dielectric loss of the device through calibration. The device can simultaneously obtain the effective value of the current signal, namely the effective value of the equipment alternating current leakage current.
The signal conditioner is arranged in a monitoring room, can perform program control amplification, filtering, multi-path selection and signal isolation on leakage current signals, and can also perform signal isolation on output signals of the resistance voltage divider. The device has the program control amplification or attenuation times of 1, 2, 5, 10, 20, 50 and 100 times, and the discharge signal is conditioned to the optimal signal input range of the acquisition board card by selecting the proper amplification times so as to reduce the quantization error during A/D conversion of the acquisition card. The device has a 100Hz low pass filtering module to reduce interference signals that may be introduced by the current signal when transmitted over long distances. The device has a multi-path selection function, because the device has a plurality of signal input ends, including leakage current signals of three phases of power equipment and phase reference voltage signals output by a resistor voltage divider, and one path of leakage current signals and one path of phase reference voltage signals need to be selected for processing in each detection.
The maximum real-time sampling rate of the adopted data acquisition card is 20MS/s, the analog bandwidth is 15MHz, the A/D resolution is 8 bits, and the input voltage range is-5V- + 5V. The card has two analog signal input ends, and can simultaneously acquire a leakage current signal and a voltage reference signal.
The adopted digital control card has three ports, each port has 8 bits to form one control word, and the control word can be written into each port to realize the control function. And controlling the channel gating, the gain adjustment and the filtering module through the digital control card.
The computer-implemented functions include acquisition, calculation, calibration, exception result rejection, result display, threshold alarm, report printing, network transmission, and the like. The computer controls the acquisition board card to simultaneously acquire the leakage current signal and the voltage reference signal, the angular difference between the leakage current signal and the voltage reference signal is calculated by adopting a frequency spectrum analysis method and a correlation method, and the frequency spectrum analysis is according to the following formula:
The correlation analysis method follows the following formula:
wherein, <math> <mrow> <msub> <mi>R</mi> <mi>xy</mi> </msub> <mrow> <mo>(</mo> <mn>0</mn> <mo>)</mo> </mrow> <mo>=</mo> <mfrac> <mn>1</mn> <mi>N</mi> </mfrac> <munderover> <mi>Σ</mi> <mrow> <mi>i</mi> <mo>=</mo> <mn>0</mn> </mrow> <mrow> <mi>N</mi> <mo>-</mo> <mn>1</mn> </mrow> </munderover> <mi>x</mi> <mrow> <mo>(</mo> <mi>i</mi> <mo>)</mo> </mrow> <mi>y</mi> <mrow> <mo>(</mo> <mi>i</mi> <mo>)</mo> </mrow> <mo>,</mo> </mrow> </math> <math> <mrow> <msub> <mi>R</mi> <mi>x</mi> </msub> <mrow> <mo>(</mo> <mn>0</mn> <mo>)</mo> </mrow> <mo>=</mo> <mfrac> <mn>1</mn> <mi>N</mi> </mfrac> <munderover> <mi>Σ</mi> <mrow> <mi>i</mi> <mo>=</mo> <mn>0</mn> </mrow> <mrow> <mi>N</mi> <mo>-</mo> <mn>1</mn> </mrow> </munderover> <msup> <mi>x</mi> <mn>2</mn> </msup> <mrow> <mo>(</mo> <mi>i</mi> <mo>)</mo> </mrow> <mo>,</mo> </mrow> </math> <math> <mrow> <msub> <mi>R</mi> <mi>y</mi> </msub> <mrow> <mo>(</mo> <mn>0</mn> <mo>)</mo> </mrow> <mo>=</mo> <mfrac> <mn>1</mn> <mi>N</mi> </mfrac> <munderover> <mi>Σ</mi> <mrow> <mi>i</mi> <mo>=</mo> <mn>0</mn> </mrow> <mrow> <mi>N</mi> <mo>-</mo> <mn>1</mn> </mrow> </munderover> <msup> <mi>y</mi> <mn>2</mn> </msup> <mrow> <mo>(</mo> <mi>i</mi> <mo>)</mo> </mrow> <mo>,</mo> </mrow> </math> x (i) and y (i) are respectively data acquired by a first channel and a second channel of the acquisition card, and N is the number of sampling points.
The obtained tangent value is the dielectric loss of the equipment, the result is calibrated according to the magnitude of the leakage current value so as to compensate the phase deviation of the hardware circuit caused by different leakage current values, the calculated abnormal result is removed, and the computer also obtains the effective value of the leakage current. After parameter calculation is completed, the computer displays results and gives an alarm, and measurement data are stored through an ORACLE database. The network server software is installed on the computer, and a remote user can view the current monitoring result and inquire historical data by accessing the IP address of the computer in the device by using internet explorer.
The applicant has completed one prototype according to the scheme of the invention, and the acquisition and analysis platform of the device is constructed by the acquisition board card and the computer, so that the system has the characteristics of friendly interface, strong calculation function and the like. Experiments prove that the method can be used for monitoring the dielectric loss and the leakage current value of the capacitive power equipment on line, calibrating different phase offsets caused by a hardware circuit according to the leakage current value, eliminating abnormal results, realizing data management through an ORACLE database, having a historical data query function, and also having functions of report printing, threshold alarm, remote query and the like.
Claims (8)
1. A device for a capacitance type power equipment dielectric loss on-line monitoring method is characterized in that the device carries out signal transmission by a signal cable, and the device comprises:
the high-precision micro-current sensor (1) is used for coupling a leakage current signal of the power equipment, and the high-precision micro-current sensor (1) is sleeved on an equipment grounding wire;
a pair of signal conditioners (2) used for amplifying, filtering, signal isolating and multiplexing the signal, the signal conditioners (2) are installed in the monitoring room;
the resistance voltage divider (3) is used for acquiring a reference voltage signal, and the resistance voltage divider (3) is arranged at the transformer substation voltage transformer end;
a data acquisition card (4) for acquiring the signals after the signal conditioner (2) is subjected to amplification, filtering, signal isolation and multipath selection;
a digital IO card (5) for controlling the channel gating, the gain adjustment and the filtering of the signal conditioner (2) and the data acquisition card (4);
a computer (6) for realizing data processing, result display, alarm and remote monitoring of the dielectric loss of the capacitive power equipment;
signals are sent to a data acquisition card (4) through a control signal conditioner (2) by a high-precision micro-current sensor (1) and a resistance voltage divider (3), a computer (6) is respectively communicated with the data acquisition card (4) and a digital IO card (5), and the digital IO card (5) is also communicated with the control signal conditioner (2).
2. The device for the on-line monitoring of the dielectric loss of the capacitive power equipment as claimed in claim 2, wherein the high-precision micro-current sensor (1) adopts a rogowski coil current sensor and is composed of an outer shielding box, a magnetic core, a coil, an integral resistor, a signal output plug and an amplifying circuit.
3. The device for the online monitoring of the dielectric loss of the capacitive power equipment as claimed in claim 3, wherein the magnetic core of the rogowski coil current sensor is an annular slope film alloy magnetic core.
4. The device for the online monitoring of the dielectric loss of the capacitive power equipment as claimed in claim 3, wherein the integral resistance is 50 Ω, and the characteristic impedance of the signal output plug is also 50 Ω.
5. A capacitive power device dielectric loss on-line monitoring arrangement as claimed in claim 2, in which the resistive divider (3) has A, B, C three phases, corresponding to A, B, C three phases of the power device.
6. An apparatus for capacitive power device dielectric loss on-line monitoring as claimed in claims 2 and 6 wherein the resistor divider (3) is a series of high power resistors with 4W power.
7. The device of claim 2, wherein the maximum real-time sampling rate of the data acquisition card is 20MS/s, the analog bandwidth is 15MHz, the a/D resolution is 8 bits, the input voltage range is-5V- +5V, and there are two analog signal input terminals.
8. The device for monitoring the dielectric loss of the capacitive power equipment on line according to claim 2, wherein the digital IO card has three ports, 8 bits of each port form a control word, and the control word is written into each port to realize the control function.
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| CN 200420041921 CN2718591Y (en) | 2004-05-17 | 2004-05-17 | Dielectric loss on-line monitoring device for capacitive electric equipment |
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| CN 200420041921 CN2718591Y (en) | 2004-05-17 | 2004-05-17 | Dielectric loss on-line monitoring device for capacitive electric equipment |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102243264A (en) * | 2010-04-13 | 2011-11-16 | 施耐德电器工业公司 | Measurement device with an electric voltage divider |
| CN102401855A (en) * | 2011-11-22 | 2012-04-04 | 李云宏 | Electric digital instrument using Rogowski coil current transformer |
| CN102841245A (en) * | 2012-09-24 | 2012-12-26 | 广西电网公司电力科学研究院 | Device for detecting end screen current parameter of high-voltage transformer bushing in real time, and control method for device |
| CN103001096A (en) * | 2012-08-22 | 2013-03-27 | 苏州久三智能科技有限公司 | Wire sensing device |
| CN103412172A (en) * | 2013-07-16 | 2013-11-27 | 国家电网公司 | Multi-channel leakage current measurement system and measurement method |
| CN103630813A (en) * | 2013-12-05 | 2014-03-12 | 国网上海市电力公司 | Solid insulated conductor insulation electrified monitoring method |
| CN105301432A (en) * | 2015-11-26 | 2016-02-03 | 国网山东省电力公司济南供电公司 | Electric power equipment insulation leakage current on-line monitoring circuit |
| CN107271828A (en) * | 2017-04-28 | 2017-10-20 | 国网山东省电力公司寿光市供电公司 | Aerial lift device with insulating arm for live working leakage current warning device |
| CN109358270A (en) * | 2018-08-22 | 2019-02-19 | 国网天津市电力公司电力科学研究院 | A method of for assessing crosslinking polyethylene-insulated cable insulation ageing state |
| CN109884487A (en) * | 2019-03-29 | 2019-06-14 | 国网河南省电力公司检修公司 | A kind of capacitance type equipment insulation monitoring mobile device |
| CN110045251A (en) * | 2019-05-05 | 2019-07-23 | 湖北工业大学 | A kind of power cable built-in electrical insulation defects detection and failure detector and method |
| CN111768599A (en) * | 2020-07-08 | 2020-10-13 | 安徽先兆科技有限公司 | AC380V loop electric safety control method and system |
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2004
- 2004-05-17 CN CN 200420041921 patent/CN2718591Y/en not_active Expired - Fee Related
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102243264A (en) * | 2010-04-13 | 2011-11-16 | 施耐德电器工业公司 | Measurement device with an electric voltage divider |
| CN102243264B (en) * | 2010-04-13 | 2016-05-11 | 施耐德电器工业公司 | With the measurement device of voltage divider |
| CN102401855A (en) * | 2011-11-22 | 2012-04-04 | 李云宏 | Electric digital instrument using Rogowski coil current transformer |
| CN103001096A (en) * | 2012-08-22 | 2013-03-27 | 苏州久三智能科技有限公司 | Wire sensing device |
| CN102841245A (en) * | 2012-09-24 | 2012-12-26 | 广西电网公司电力科学研究院 | Device for detecting end screen current parameter of high-voltage transformer bushing in real time, and control method for device |
| CN103412172A (en) * | 2013-07-16 | 2013-11-27 | 国家电网公司 | Multi-channel leakage current measurement system and measurement method |
| CN103630813B (en) * | 2013-12-05 | 2016-08-31 | 国网上海市电力公司 | A kind of method of solid insulation conductor insulation live monitoring |
| CN103630813A (en) * | 2013-12-05 | 2014-03-12 | 国网上海市电力公司 | Solid insulated conductor insulation electrified monitoring method |
| CN105301432A (en) * | 2015-11-26 | 2016-02-03 | 国网山东省电力公司济南供电公司 | Electric power equipment insulation leakage current on-line monitoring circuit |
| CN107271828A (en) * | 2017-04-28 | 2017-10-20 | 国网山东省电力公司寿光市供电公司 | Aerial lift device with insulating arm for live working leakage current warning device |
| CN107271828B (en) * | 2017-04-28 | 2019-07-12 | 国网山东省电力公司寿光市供电公司 | Aerial lift device with insulating arm for live working leakage current warning device |
| CN109358270A (en) * | 2018-08-22 | 2019-02-19 | 国网天津市电力公司电力科学研究院 | A method of for assessing crosslinking polyethylene-insulated cable insulation ageing state |
| CN109884487A (en) * | 2019-03-29 | 2019-06-14 | 国网河南省电力公司检修公司 | A kind of capacitance type equipment insulation monitoring mobile device |
| CN110045251A (en) * | 2019-05-05 | 2019-07-23 | 湖北工业大学 | A kind of power cable built-in electrical insulation defects detection and failure detector and method |
| CN111768599A (en) * | 2020-07-08 | 2020-10-13 | 安徽先兆科技有限公司 | AC380V loop electric safety control method and system |
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