CN203133157U - Transformer iron core/clamp grounding current wireless monitoring device - Google Patents
Transformer iron core/clamp grounding current wireless monitoring device Download PDFInfo
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- CN203133157U CN203133157U CN 201320129546 CN201320129546U CN203133157U CN 203133157 U CN203133157 U CN 203133157U CN 201320129546 CN201320129546 CN 201320129546 CN 201320129546 U CN201320129546 U CN 201320129546U CN 203133157 U CN203133157 U CN 203133157U
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Abstract
The utility model belongs to the field of on-line monitoring of a transformer, and particularly relates to a transformer iron core/clamp grounding current wireless monitoring device based on wireless communication. According to the transformer iron core/clamp grounding current wireless monitoring device, a feed-through current transformer and a device working circuit board are arranged in a shell. The upper part of the shell is connected with a shell top cover which is provided with a display screen which is connected with a controller. An external wireless communication antenna module is led out from the shell. The transformer iron core/clamp grounding current wireless monitoring device can carry out data real-time monitoring and has functions of current overlimit alarm, data information storage, system synchronization and parameter configuration, a hidden fault can be timely discovered, and the inspection work of the operating staff is reduced or substituted. The transformer iron core/clamp grounding current wireless monitoring device is widely used in the online monitoring of iron core/clamp grounding current of electrical equipment such as a transformer and a reactor.
Description
Technical field
The utility model belongs to the transformer online monitoring field, relates in particular to a kind of transformer core based on radio communication/clamp earthing current wireless monitoring device.
Background technology
Power transformer is one of equipment crucial in the electric system, also is the higher link of failure rate in the power equipment, and its normal operation is the important assurance of power system security, reliable, high-quality, economical operation.When power transformer normally moves, iron core/folder must have and only have some reliable grounds, in case when 2 of iron core/folders or multipoint earthing, produce circulation in the inner meeting of iron core/folder, cause local overheating, can cause iron core/folder localized burn when serious, even ground lug is fused, cause iron core/folder electric potential floating, produce discharge property fault, the reliability service of serious threat transformer and electrical network.
When transformer normally moved, iron core/clamp earthing current was milliampere level, and when iron core/folder generation multipoint earthing fault, iron core/clamp earthing current can obviously increase.Show that according to actual operating data under normal circumstances, the iron core/clamp earthing current of transformer has only several milliamperes～tens milliamperes, according to the rules requirement, when iron core/clamp earthing current reaches 100 milliamperes, just must take corresponding measure to handle.
The means that present operations staff detects iron core/clamp earthing current mainly adopt clamp on amperemeter that the current data of iron core/folder ground outlet is measured, but on-the-spot electromagnetic interference (EMI) is big, be difficult to guarantee precision and the accuracy of clamp on amperemeter measurement data, and regular visit can't guarantee in time to find iron core/multipoint earthing of clamping piece fault.
The utility model content
At the problem that exists in above-mentioned transformer core/clamp earthing current measurement, the utility model provides a kind of transformer core based on radio communication/clamp earthing current wireless monitoring device, its objective is the precision of the very difficult assurance measurement data that exists in the transformer core/folder ground state method in the solution monitoring running status in the past and the problem of accuracy, and regular visit can't guarantee in time to find the problem of iron core/multipoint earthing of clamping piece fault.
The utility model is achieved through the following technical solutions:
Transformer core/clamp earthing current wireless monitoring device comprises controller, real-time clock system, voltage signal modulate circuit, gear switch control circuit, current-to-voltage converting circuit and straight-through current transformer and wireless communication module; Described straight-through current transformer is connected to current-to-voltage converting circuit, current-to-voltage converting circuit is connected to the gear switch control circuit, the gear switch control circuit is connected to the voltage signal modulate circuit, and voltage signal modulate circuit, real-time clock system, FLASH memory circuitry, E2PROM memory circuitry and wireless communication module are connected to controller.
Also comprise display screen; Display screen is connected to controller.
Also be connected with the data radio communication module on the described controller.
Described controller, real-time clock system, FLASH memory circuitry, E2PROM memory circuitry, voltage signal modulate circuit, gear switch control circuit, current-to-voltage converting circuit, straight-through current transformer and wireless communication module all are arranged in the housing, external wireless communication module antenna is drawn from housing, and display screen is arranged on the closure head.
The no-load voltage ratio of described straight-through current transformer is 1000:1; The range of the switching of gear switch control circuit is 0-100mA and 100mA-10A.
Advantage of the present utility model and effect are:
The utility model can be monitored the real-time change situation of transformer core/clamp earthing current data in real time, and has the electric current overload alarm, data information memory, system to the time, multiple functions such as parameter flexible configuration, both can in time find transformer core/multipoint earthing of clamping piece potential faults, and can also reduce even replace the operations staff to the work of patrolling and examining of transformer core/clamp earthing current operation conditions.Therefore, to carry out on-line monitoring be very meaningful and be necessary the work in ground to transformer core/clamp earthing current.
The utility model is the situation of change of stable real-time monitoring transformer core/clamp earthing current accurately, thereby the state of transformer core/folder ground connection in the monitoring running status is transformer operation conditions assessment foundation.The utility model can be widely used in the on-line monitoring of the iron core/folder/clamp earthing current of electrical equipments such as transformer, reactor.
The utility model device can be used for the monitoring of transformer core/clamp earthing current and folder electric current.This on-Line Monitor Device comprises the iron core/clamp earthing current extension line that is installed in the transformer body, this ground current extension line is connected with the transformer grounding end after passing straight-through current transformer, the secondary induced signal of straight-through current transformer inserts the metering circuit of on-Line Monitor Device, metering circuit is by current-to-voltage converting circuit, gear switch control circuit and voltage signal modulate circuit constitute, metering circuit links to each other with controller, after controller carries out computing with the simulating signal of metering circuit, the display screen that carries by device shows final measurement data, and this measurement data is stored in the memory storage that device carries, provide the data guarantee for analyzing transformer core/clamp earthing current running status, this device can carry out data communication by communication and comprehensive monitoring unit (IED) or computing machine, and adopting MODBUS communication protocol, computing machine can be by the communication of wireless communication module to installing that connects, measure, report to the police, parameters such as calibration are configured.
This monitoring device has the iron core/monitoring of clamp earthing current data in real time and overload alarm function, alarming value can be defined voluntarily by the user, when abnormal conditions occurring, the display screen of device and the computing machine of remote monitoring all can send alerting signal, make the staff can in time take treatment measures, avoid the generation of transformer fault, guarantee the stable operation of electric system.
By the enforcement of technical solutions of the utility model, can be really to the accurate and stable real-time measurement of transformer core/clamp earthing current.The utility model method for designing has following innovative point:
1, the innovation of measuring method:
(1) this device is to obtain iron core/clamp earthing current signal by the method that adopts the high precision straight-through current transformer to be sleeved on transformer core/folder ground wire, the current signal that this method is obtained can truly reflect the situation of change of iron core/clamp earthing current, and be not electrically connected with transformer, the operation of transformer is not produced any influence;
(2) signal of Current Transformer Secondary acquisition directly inserts measurement mechanism, and measurement mechanism carries out analytical calculation by Digital Signal Processing to current signal, and shows that storage of measurement data is in device.Make things convenient for the operations staff in the on-site-inspection data and transfer analysis transformer core/clamp earthing current historical data.
(3) during the transformer operate as normal, iron core/clamp earthing current size is tens milliamperes of scopes, but in case when abnormal occurrence such as 2 of iron core/folders or multipoint earthing occurring, iron core/clamp earthing current can reach several amperes, variation range is very big, and for the accuracy that guarantees to measure and the security of measurement mechanism, this device has designed current range gearshift function, according to the scope that phone changes, device can be regulated suitable gear automatically and measure electric current.This device current measuring range is 10A to the maximum, and measuring accuracy has satisfied the requirement of iron core/clamp earthing current measurement range and precision fully less than 1%.
2, apparatus structure and mounting means: iron core of the present utility model/clamp earthing current on-Line Monitor Device, current transformer and measurement mechanism are contained in the shell, shell adopts casting aluminium material, offered display window at closure head, be used for observing current data, the shell independent grounding is used for the extraneous electromagnetic interference (EMI) of shielding.
3, device carries the data Presentation Function, and temporal information and real-time current data are presented on the display screen, observes when making things convenient for the operations staff to patrol and examine.When Monitoring Data was out-of-limit, display screen reminded the personnel of patrolling and examining to note display alarm information.
4, device has data storage function, and temporal information and real-time current data are kept in the FLASH storer that device carries, and the power down of storage data is not lost, and can preserve the measurement data more than a year continuously.For analyzing iron core/clamp earthing current historical data, understanding iron core/clamp earthing current situation of change provides foundation.
5, device adopts wireless communication interface, adopts the good MODBUS-RTU communication protocol of industrial circle versatility, can information such as Monitoring Data and the monitoring moment be uploaded to computing machine or comprehensive monitoring unit (IED) by communication protocol.
6, can by computing machine or comprehensive monitoring unit (IED) to device parameter (as unit address, baud rate, odd even effect, sampling time interval, overload alarm value, clock time etc.) carry out flexible configuration, make things convenient for device to insert other on-line monitoring systems, satisfy different on-the-spot requirements.
7, device have with computing machine or comprehensive monitoring unit (IED) carry out to the time function, guaranteed accuracy and the consistance of device monitoring time and equipment actual run time.
8, the design of anti-electromagnetic interference (EMI) and surge protection circuit.Because the monitoring scene is in high voltage, strong magnetic field circumstance, the electromagnetic interference (EMI) that electronic equipment is produced causes monitoring device work undesired easily,, takes measures from hardware and software specially for this reason, has improved the antijamming capability of device.Simultaneously in order to bear the superpotential impact that the electric system frequent operation brings; device has also designed reliable surge protection circuit; current signal is gathered metering circuit close interface such as power circuit and carried out the design of excess voltage protection, effectively raise the protective capability of monitoring device antisurge.
9, the utility model apparatus structure is compact to design, and good looking appearance is on mounting means, employing is directly installed on the mode of transformer body by the suspension member of crust of the device, and simple to operate, installation method is easy, safety is convenient to operations staff's mounting, commissioning and maintenance, and install and use at the scene of being very suitable for.
Description of drawings
Fig. 1 is the principle of work synoptic diagram of the utility model device;
Fig. 2 is the hardware block diagram of the utility model device;
Fig. 3 is networking structure synoptic diagram of the present utility model.
Fig. 4 is the inner structure synoptic diagram of the utility model device;
Fig. 5 is the external structure synoptic diagram of the utility model device;
Fig. 6 is the outside perspective view of the utility model device.
Fig. 7 is the current signal sample circuit schematic diagram of the utility model device.
Among the figure: straight-through current transformer 1, device operating circuit plate 2, wireless communication module antenna 3, display screen 4, housing 5, closure head 6.
The utility model is described in more detail below in conjunction with the drawings and specific embodiments.
Embodiment
As shown in Figure 1, the utility model is a kind of transformer core based on radio communication/clamp earthing current wireless monitoring device, and this device is by straight-through current transformer 1, installs operating circuit plate 2 in housing 5; Housing 5 tops connect closure head 6, and closure head 6 is provided with display screen 4; Described device operating circuit plate 2 is provided with controller, real-time clock system, voltage signal modulate circuit, gear switch control circuit, current-to-voltage converting circuit, FLASH memory circuitry, E2PROM memory circuitry and wireless communication module; Described straight-through current transformer 1 is connected to current-to-voltage converting circuit, current-to-voltage converting circuit is connected to the gear switch control circuit, the gear switch control circuit is connected to the voltage signal modulate circuit, and voltage signal modulate circuit, real-time clock system, FLASH memory circuitry, E2PROM memory circuitry and wireless communication module are connected to controller; Display screen 4 is connected to controller; External wireless communication module antenna 3 is drawn from housing 5.
The no-load voltage ratio of straight-through current transformer 1 described in the utility model is 1000:1; The switching range of gear switch control circuit is 0-100mA and 100mA-10A.Select for use straight-through current transformer 1 as the primary current harvester in this example, model is: CT-X-3, two kinds of range: 1:0-100mA, 2:100mA-10A are adopted in the secondary current collection.When ground current varies in size, adopt range automatic switching circuit that the electric current of different ranges is measured, thereby guarantee the accuracy of data.
Transformer core/clamp earthing current wireless monitoring method may further comprise the steps:
(1) straight-through current transformer is sleeved on obtains iron core/clamp earthing current signal on transformer core/folder ground wire one time;
(2) utilize straight-through current transformer that the primary current signal of gathering is converted to the secondary current signal, and convert this secondary current signal to voltage signal;
(3) voltage signal amplify is handled by gear switch after, behind the overvoltage signal modulate circuit, send into again in the AD circuit that controller carries and carry out computing; And compare with the alarm threshold value that sets in advance, when controller control display screen display alarm signal appears when unusual in signal;
(4) signal with computing in the step (3) shows by display screen on the one hand, constantly deposit measurement result and measurement in the FLASH storer on the other hand, can also carry out radio communication by data radio communication module and supervisory control comuter or comprehensive monitoring unit (IED), for providing foundation with post analysis iron core/clamp earthing current working condition.
Monitoring device is transferred to supervisory control comuter or comprehensive monitoring unit (IED) by communication with the real-time measuring data in the above-mentioned steps (3) or historical data, computing machine or IED carry out various parameter configuration by communication protocol to monitoring device, to satisfy different on-the-spot demands.
As shown in Figure 2, the utility model when in use, straight-through current transformer 1 back of the iron core/clamp earthing current extension line of transformer body being passed the utility model device is connected with the transformer grounding end, straight-through current transformer 1 is sleeved on obtains iron core/clamp earthing current signal on transformer core/folder ground wire one time in other words;
Straight-through current transformer 1 is converted to the secondary current signal after transformer core/clamp earthing current signal is coupled to secondary coil, and convert this secondary current signal to voltage signal through current-to-voltage converting circuit, after this voltage signal is handled through the amplification of gear automatic switching control circuit, behind the overvoltage signal modulate circuit, send in the AD circuit that controller carries and carry out computing, and compare with predefined alarm threshold value, if measurement result is unusual, controller is then controlled display screen 4 display alarm signals, and through the result after the controller calculating and measurement time constantly, can show by the display screen 4 that device carries, this time is provided by the real-time clock system, deposit measurement result and the time constantly of measuring in the FLASH storer simultaneously, as the information back-up data, for providing foundation with post analysis iron core/clamp earthing current working condition.In addition, can also utilize the data radio communication module that real time data or historical data are transferred to supervisory control comuter or comprehensive monitoring unit (IED), and supervisory control comuter or IED can carry out various parameter configuration to monitoring device by communication protocol, to satisfy different on-the-spot demands.When the utility model detects transformer core/clamp earthing current overshoot scope, whole transformer core/clamp earthing current on-Line Monitor Device and supervisory control comuter will send alerting signal, remind the operations staff to take measures to handle, prevent the generation of transformer fault.
The method of measuring transformer iron core/clamp earthing current is as follows in this utility model:
As shown in Figure 7, suppose I
1For iron core/folder ground connection primary current value, be I by gained secondary current value behind the straight-through current transformer of 1000:1 no-load voltage ratio
2
Namely
Through behind the current-voltage conversion circuit, U
1=I
2R
U
1Through behind the amplifying circuit, voltage is enlarged into U
1* K
Wherein
(according to range difference, R
2And the K value will change thereupon)
Behind a DC stacked circuit, the voltage that is input to the AD mouth is U
1* K+U
Dc
0≤U
1*K+U
dc≤U
ref
U
RefBe the AD reference voltage
Work as U
1* K+U
Dc〉=U
RefThe time, when namely surpassing current range ability, it is big or small that processor will be regulated K value, with satisfied 0≤U
1* K+U
Dc≤ U
RefCondition.
The voltage fundamental effective value that enters AD is tried to achieve by Fourier Transform Algorithm.
Obtain the voltage fundamental effective value, handle and oppositely derive by multiple averaging, calculate namely be transformer core/clamp earthing current effective value.Organizing data with next is that laboratory measurement obtains data, sees table 1 for details.
Table 1: laboratory measurement data
| Sampling time | Measuring current source (mA) | Measurement device result (mA) |
| 2012-8-209:00 | 1.0mA | 0.99mA |
| 2012-8-209:05 | 10.0mA | 9.98mA |
| 2012-8-209:10 | 50.0mA | 49.50mA |
| 2012-8-209:15 | 110.0mA | 109.3mA |
| 2012-8-209:20 | 210.0mA | 208.0mA |
| 2012-8-209:25 | 500.0mA | 495.5mA |
Claims (3)
1. transformer core/clamp earthing current wireless monitoring device is characterized in that: straight-through current transformer (1), device operating circuit plate (2) are arranged in the housing (5); Housing (5) top connects closure head (6), and closure head (6) is provided with display screen (4);
Described device operating circuit plate (2) is provided with controller, real-time clock system, voltage signal modulate circuit, gear switch control circuit, current-to-voltage converting circuit, FLASH memory circuitry, E2PROM memory circuitry and wireless communication module; Described straight-through current transformer (1) is connected to current-to-voltage converting circuit, current-to-voltage converting circuit is connected to the gear switch control circuit, the gear switch control circuit is connected to the voltage signal modulate circuit, and voltage signal modulate circuit, real-time clock system, FLASH memory circuitry, E2PROM memory circuitry and wireless communication module are connected to controller; Display screen (4) is connected to controller; External wireless communication module antenna (3) is drawn from housing (5).
2. transformer core according to claim 1/clamp earthing current wireless monitoring device is characterized in that: also be connected with the data radio communication module on the described controller.
3. transformer core according to claim 1/clamp earthing current wireless monitoring device, it is characterized in that: the no-load voltage ratio of described straight-through current transformer (1) is 1000:1; The range of the switching of gear switch control circuit is 0-100mA and 100mA-10A.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320129546 CN203133157U (en) | 2013-03-21 | 2013-03-21 | Transformer iron core/clamp grounding current wireless monitoring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320129546 CN203133157U (en) | 2013-03-21 | 2013-03-21 | Transformer iron core/clamp grounding current wireless monitoring device |
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| Publication Number | Publication Date |
|---|---|
| CN203133157U true CN203133157U (en) | 2013-08-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201320129546 Expired - Lifetime CN203133157U (en) | 2013-03-21 | 2013-03-21 | Transformer iron core/clamp grounding current wireless monitoring device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103163364A (en) * | 2013-03-21 | 2013-06-19 | 辽宁省电力有限公司电力科学研究院 | Wireless monitoring device and monitoring method for grounding current of transformer core/clamp |
| CN103441725A (en) * | 2013-08-27 | 2013-12-11 | 国家电网公司 | System for monitoring and controlling grounding currents of transformer core |
| CN107703406A (en) * | 2017-09-28 | 2018-02-16 | 浙江群力电气有限公司 | A kind of power transformer iron core grounding monitor method and system |
-
2013
- 2013-03-21 CN CN 201320129546 patent/CN203133157U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103163364A (en) * | 2013-03-21 | 2013-06-19 | 辽宁省电力有限公司电力科学研究院 | Wireless monitoring device and monitoring method for grounding current of transformer core/clamp |
| CN103441725A (en) * | 2013-08-27 | 2013-12-11 | 国家电网公司 | System for monitoring and controlling grounding currents of transformer core |
| CN107703406A (en) * | 2017-09-28 | 2018-02-16 | 浙江群力电气有限公司 | A kind of power transformer iron core grounding monitor method and system |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130814 |
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| CX01 | Expiry of patent term |