CN103954829A - Transformer core grounding current online monitoring system - Google Patents
Transformer core grounding current online monitoring system Download PDFInfo
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- CN103954829A CN103954829A CN201410203809.4A CN201410203809A CN103954829A CN 103954829 A CN103954829 A CN 103954829A CN 201410203809 A CN201410203809 A CN 201410203809A CN 103954829 A CN103954829 A CN 103954829A
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 61
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Abstract
The invention discloses a transformer core grounding current online monitoring system. The system comprises a current sensor unit, a monitoring unit and a server, wherein the current sensor unit is used for measuring core grounding leakage currents of corresponding transformers and sending grounding current measured value signals; the monitoring unit is used for receiving transmission signals from the current sensor unit so as to monitor core grounding current states of every transformer according to transmitted current signal values; and the server is integrated with the WEB and is used for receiving the core grounding current signals of the monitoring unit on the transformers so as to store data for further calling, calculation, analysis and release. The transformer core grounding current online monitoring system is in a plug-and-play mode, the core grounding current values of the transformers can be monitored without needing software compensation and setting, the problem concerning the monitoring range, linearity and precision in the prior art is solved, the monitoring range is improved to an ampere level, the full scale linearity is kept consistent, and the measurement accuracy is maintained at a uniform high precision within the full scale range through a hardware measurement mode.
Description
technical field:
The present invention relates to a kind of on-line monitoring system, relate in particular to the real-time monitoring system of substation transformer iron core grounding leakage current.
background technology:
Up to now, proposed various types of for monitoring the system of transformer iron core grounding current.In these systems, it is all high precision core-theaded type current sensor of a transformer configuration, a monitoring means of corresponding configuration, wherein high precision core-theaded type current sensor comprises for the current sensor of measuring transformer iron core grounding current and for the power supply of current sensor work, and monitoring means is for receiving the current sample simulating signal of sending from core-theaded type current sensor, to rise to warning value at transformer iron core grounding current measured value, send warning when above.
In this existing transformer iron core grounding current on-line monitoring system, in order to grasp every transformer iron core grounding current value, and by formulation 485 address registrations of distributing to each monitoring means in background system software.Utilize this device, when background system software send instruction acquisition specify 485 addresses comprise transformer iron core grounding current value time, background system software just can be grasped according to 485 addresses the size of current of which platform transformer unit.
But above-mentioned iron core grounding current monitoring range is little, be a milliampere level current range, monitoring accuracy is inconsistent, poor linearity.In this existing transformer iron core grounding current on-line monitoring system, in order to monitor the accuracy of iron core grounding current value, to adjusting as meeting the linearity of measuring accuracy by sampling with high precision sensor in a segment limit of transformer iron core grounding current normal value, in this extraneous measuring accuracy, all occur that the obvious linearity declines, even if the mode by software compensation also cannot meet measuring accuracy requirement, if error is too large, for the fortune inspection personnel of Utilities Electric Co., just cannot judge that whether this measured value is accurate, the iron core grounding current normal range of whether formulating in State Grid Corporation of China's standard criterion.For using on-line monitoring to substitute prophylactic repair, realize repair based on condition of component just without any meaning.
In existing transformer iron core grounding current on-line monitoring system, exist monitoring range little, be a milliampere level current range, monitoring accuracy is inconsistent, poor linearity.In this existing transformer iron core grounding current on-line monitoring system, in order to monitor the accuracy of iron core grounding current value, to adjusting as meeting the linearity of measuring accuracy by sampling with high precision sensor in a segment limit of transformer iron core grounding current normal value, in this extraneous measuring accuracy, all occur that the obvious linearity declines, even if the mode by software compensation also cannot meet measuring accuracy requirement, if error is too large, for the fortune inspection personnel of Utilities Electric Co., just cannot judge that whether this measured value is accurate, the iron core grounding current normal range of whether formulating in State Grid Corporation of China's standard criterion.
summary of the invention:
The transformer iron core grounding current on-line monitoring system that the object of this invention is to provide a kind of high precision high linearity, it is by the mode of hyperchannel, multisensor, plug and play, without software compensation, just can monitor the iron core grounding current value of transformer with adjusting, solved the problem of monitoring range, the linearity, precision in prior art, monitoring range is promoted to ampere level, the gamut linearity is consistent, and measuring accuracy keeps unified high precision by the mode of hard ware measure in the scope of full scale.
For this reason, the technical solution adopted in the present invention is: a kind of transformer iron core grounding current on-line monitoring system, it is characterized in that, comprise: current sensor unit, for measuring the iron core grounding leakage current of corresponding transformer, and sending ground current measured value signal, described current sensor cellular installation is in the transformer core grounding band iron of different electric pressures or the connection over the ground of other pattern;
Monitoring means, for receiving the signal transmission from described current sensor unit, to monitor the iron core grounding current state of every transformer according to the current signal value of transmission, described monitoring means comprises a plurality of sampling channels that are connected with described current sensor unit respectively, the signal transmission of each received current sensor unit of described sampling channel;
The server of data and WEB one, for receiving the iron core grounding current signal from monitoring means on transformer, to store for further calling and calculate, analyze and issuing.
Further, described current sensor unit is comprised of the current transformer of a 0.1mA to 70mA and the current sensor of a 1mA to 10A.
Further, described monitoring means is comprised of a Cotex-M3 processor and ARM11 processor.
Further, the ARM11 processor in described monitoring means carries out overloading analysis, judgement to the current signal value of each sampling channel, and carries out handover measurement successively.
Further, described monitoring means also comprises the sensor for detection of the temperature of ARM11 processor, when described temperature sensor detects temperature, has surpassed limit value, and monitoring means sends command request ARM11 processor and enters power save mode.
The beneficial effect that the present invention produces is: a high precision electric current transducer unit comprises that the current sensor of 0.1mA to a 70mA range ability and the current sensor of 1mA to a 10A range ability are respectively used to the separating and measuring of little electric current and large electric current, because the iron core grounding leakage current of transformer under healthy running status is 0.5mA to 1mA, due to the large reason of current sensor material technology and iron core punching aperture, in the scope of 0.1mA to 100mA, can control the precision of electric current induction, but the precision that can not keep same measurement for large current sample, in order to keep in 0.1mA to 10A scope 0.5% precision, the present invention is combined with the current sensor of the current sensor of 0.1mA to 70mA range ability and 1mA to a 10A range ability, the precision of actual measurement sampling is all higher than 0.5%, expanded the measurement range of iron core grounding current simultaneously, again measurement range is carried out to block sampling, 6 sections of samplings are divided into 0.07-0.7mA, 0.7-7mA, 7-70mA, 70-100mA, 100-1000mA, 1000-10000mA, by overload evaluation algorithm is set in ARM11, automatic switchover overrange sampling channel, is controlled in 0.02% the linearity of block sampling.
accompanying drawing explanation:
Fig. 1 is structural representation of the present invention;
Fig. 2 is transformer iron core grounding current on-line monitoring unit schematic diagram;
Fig. 3 transformer iron core grounding current on-line monitoring sampling channel schematic diagram;
Fig. 4 transformer iron core grounding current overload decision flow chart.
embodiment:
Hereinafter with reference to accompanying drawing, one embodiment of the present of invention are described.This embodiment relates to such example: will be applied to a 220kV 3-phase autotransformer according to transformer iron core grounding current on-line monitoring system of the present invention.But, also can the transformer such as 110kV three-phase transformer, 330kV 3-phase autotransformer, this other electric pressure of 500kV single transformer will be applied to according to transformer iron core grounding current on-line monitoring system of the present invention.
Fig. 1 schematically shows a kind of structure of transformer iron core grounding current on-line monitoring system according to the present embodiment.
As shown in Figure 1, transformer iron core grounding current on-line monitoring system comprises that being arranged on respectively 220kV transformer core connects the iron core grounding current sensor unit 2 on 1, for measuring transformer iron core leakage current over the ground, and for sending the signal of leakage current measurement.Current sensor unit for measuring transformer iron core leakage current over the ground adopts high precision electric current transducer unit, a high precision electric current transducer unit comprises the current sensor of 0.1mA to a 70mA range ability and the current sensor of 1mA to a 10A range ability, these two different sensors are respectively used to the separating and measuring of little electric current and large electric current, and current sensor adopts a circle core-theaded type zero passive principle design of magnetic flux.
In addition, transformer iron core grounding current on-line monitoring system comprises a monitoring means 3 that is positioned at transformer side, for receiving the signal of launching from sensor unit 2, to carry out monitoring analysis judgement transformer core current status over the ground according to signal transmission current measurement value, finally by the system server 5 in optical fiber communication 4 access transformer iron core grounding current on-line monitoring system screens 7, in system server 5, platform software shows by LCD display 6, provide final this transformer iron core grounding current with time target status information.
As shown in Figure 2, it has shown the connected mode of the inner structure of monitoring means 3 and foreign current sensor 2, system server 5, and this monitoring means 3 adopts 8 power supplies of AC220V civil powers.In this structure in the inside of monitoring means 3, sampling channel 14 by the current analog signal of measuring for received current sensor 2, 15, 16, 17, 18, 19 and the 7th sampling channel 20 of the temperature signal measured of temperature sensor 21, process and carry out the Cotex-M3 processor 12 of AD conversion, and one for to current digital signal medium filtering, overload judgement, storage, the ARM11 processor 22 of communication, also has power unit AC/DC power of alterating and direct current 9, DC/DC DC conversion power 10, 11, 485 telecommunication circuits 26 and optical fiber communication circuit 27 and four external 232 debugging interfaces form, in addition current sensor 1 by five-core cable as transmission medium by analog signal transmission to monitoring means 3, wherein five-core cable has comprised three core iron core grounding current signal wires and two core power leads, it is common ground that iron core power supply and signal wire have a core, so iron core grounding current signal is to transmit respectively from two cores respectively, one core is to be connected with the sampling channel 14,15,16 of monitoring means 3, and another core is to be connected with the sampling channel 17,18,19 of monitoring means 3.
In this structure, sampling channel 14 to 16 need to carry out port merging, gather the current sensor of 0.1mA to 70mA range ability, sampling channel 17 to 19 need to carry out port merging, gather the current sensor of 1mA to 10A range ability, sampling channel 14,15,16,17,18,19 all has identical structure, and segmentation limit regulates and can go to carry out with 0.5% accuracy standard like this.Therefore,, only the first sampling channel 14 is described.
Certainly, also has the zero crossing current signal gathering through the first sampling channel 14, in access Cotex-M3, from received signal, extract the zero crossing current measurement value of sampling channel 14, after A/D 13 conversions, by UART communication port access ARM11 processor 22, zero crossing current measurement value is carried out to overloading analysis, judgement.
In addition in this structure, monitoring means also comprises a temperature sensor 21, temperature for detection of monitoring means 3 internal environments, when temperature sensor 21 detects temperature over setting threshold, monitoring means sends overtemperature alarm signal to transformer iron core grounding current on-line monitoring system background server.Temperature sensor 21 is arranged on the upper face of ARM11 processor 22, directly measures the working temperature of ARM11 processor 22, receives temperature simultaneously, there is the setting threshold of surpassing, promote ARM11 processor 22 and enter power save mode, reduce power consumption, extend the serviceable life of monitoring means.
In ARM11 processor 22, for the result of determination of the iron core grounding current state of current sensor 2, by IP113C fiber optic data communication interface 26, be access in system server 5, by the platform software in system server 5, carry out man-machine interaction demonstration.
In addition, monitoring means 3 also provides optical fiber communication 4 interfaces, from 4 232 communication interfaces of ARM11, utilize the external IP113C optical fiber communication of one of them 232 modulation interface 24 chip 26, another 232 modulated structure 23 connects 485 addresses 25, correspondence with foreign country mode using optical fiber communication 4 as monitoring means 3, meet long-distance transmissions transformer iron core grounding current information, improve the anti-interference of communication in transformer station's strong electric field environment, therefore can keep communicating by letter with the satisfied of transformer iron core grounding current on-line monitoring system background server that is arranged on transforming plant protecting chamber.
Fig. 3 has shown the inner structure of the first sampling channel 14 in monitoring means 3.As shown in Figure 3, the first sampling channel 14 is comprised of I/V change-over circuit 27, negative-feedback circuit 28; The current analog signal that I/V change-over circuit 27 receives imports negative-feedback circuit 28 into, so as to carry out all like amplifications and detection, precision regulates such processing of adjusting, and guarantees that the precision of current measurement value is controlled in 0.2%.
Below, by the transformer iron core grounding current overload decision flow chart referring to Fig. 4, to thering is the flow process of the mathematical operation of carrying out in the transformer iron core grounding current on-line monitoring system 1 of said structure, describe.
Fig. 4 it shown will in monitoring means 3 ARM11 processor 22 interior execution processing.
Below will describe:
As shown in Figure 4, in step S10, for the size of the current signal value picking out from current sensor 2, judge.After receiving overload current signal, operating process forwards step S20 to; If receive non-overload current signal, operating process forwards treatment S 50 to.On the other hand, in the situation that not receiving current signal, operation enters waiting status, until receive this signal.
In step S20, receive the current signal value of next passage, operating process forwards step S30 to, and the size of the current signal value of next passage is judged.After receiving overload current signal, operating process forwards S40 to, if receive non-overload current signal, operating process forwards treatment S 50 to; A sampling channel to the last successively, the current signal of measurement all overload is invalid.
Should be appreciated that the present invention is not limited in above-mentioned example, but intention covers the institute of the inventive embodiment that does not depart from purport of the present invention and scope, change and modification.
Claims (5)
1. a transformer iron core grounding current on-line monitoring system, is characterized in that, comprising:
Current sensor unit, for measuring the iron core grounding leakage current of corresponding transformer, and sends ground current measured value signal, and described current sensor cellular installation is in the transformer core grounding band iron of different electric pressures or the connection over the ground of other pattern;
Monitoring means, for receiving the signal transmission from described current sensor unit, to monitor the iron core grounding current state of every transformer according to the current signal value of transmission; Described monitoring means comprises a plurality of sampling channels that are connected with described current sensor unit respectively; Described sampling channel is the signal transmission of energy received current sensor unit all;
The server of data and WEB one, for receiving the iron core grounding current signal from monitoring means on transformer, to store for further calling and calculate, analyze and issuing.
2. transformer iron core grounding current on-line monitoring system according to claim 1, is characterized in that: described current sensor unit is comprised of the current transformer of a 0.1mA to 70mA and the current sensor of a 1mA to 10A.
3. transformer iron core grounding current on-line monitoring system according to claim 1, is characterized in that: described monitoring means is comprised of a Cotex-M3 processor and ARM11 processor.
4. transformer iron core grounding current on-line monitoring system according to claim 1, is characterized in that: the ARM11 processor in described monitoring means carries out overloading analysis, judgement to the current signal value of each sampling channel, and carries out handover measurement successively.
5. transformer iron core grounding current on-line monitoring system according to claim 1, it is characterized in that: described monitoring means also comprises the sensor for detection of the temperature of ARM11 processor, when described temperature sensor detects temperature, surpassed limit value, monitoring means sends command request ARM11 processor and enters power save mode.
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| CN201410203809.4A CN103954829A (en) | 2014-05-15 | 2014-05-15 | Transformer core grounding current online monitoring system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105717349A (en) * | 2014-12-02 | 2016-06-29 | 国家电网公司 | Grounding current on-line monitoring device and grounding current on-line monitoring method |
| CN107465169A (en) * | 2017-09-13 | 2017-12-12 | 山东航海电器设备有限公司 | A kind of digital reverse-power relay |
| CN108241103A (en) * | 2018-01-19 | 2018-07-03 | 广东电网有限责任公司茂名供电局 | A kind of low pressure becomes platform electric leakage monitor and alarm system and its alarming method by monitoring |
| CN108614184A (en) * | 2018-06-06 | 2018-10-02 | 浙江巨磁智能技术有限公司 | Electric vehicle combined type leakage current sensing device |
| CN111610358A (en) * | 2020-05-27 | 2020-09-01 | 许昌中科森尼瑞技术有限公司 | Method for calculating residual current by collecting three-phase and zero-sequence currents under three-phase four-wire system |
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| CN101387676A (en) * | 2008-07-17 | 2009-03-18 | 东北电力大学 | Large-sized transformer core and on-line monitoring and protecting system for insulaiton fault of clamps |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105717349A (en) * | 2014-12-02 | 2016-06-29 | 国家电网公司 | Grounding current on-line monitoring device and grounding current on-line monitoring method |
| CN107465169A (en) * | 2017-09-13 | 2017-12-12 | 山东航海电器设备有限公司 | A kind of digital reverse-power relay |
| CN108241103A (en) * | 2018-01-19 | 2018-07-03 | 广东电网有限责任公司茂名供电局 | A kind of low pressure becomes platform electric leakage monitor and alarm system and its alarming method by monitoring |
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| CN111610358A (en) * | 2020-05-27 | 2020-09-01 | 许昌中科森尼瑞技术有限公司 | Method for calculating residual current by collecting three-phase and zero-sequence currents under three-phase four-wire system |
| CN111610358B (en) * | 2020-05-27 | 2022-09-27 | 许昌中科森尼瑞技术有限公司 | Method for calculating residual current by collecting three-phase and zero-sequence currents under three-phase four-wire system |
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