CN103197178A - Device and method of on-line monitoring of transformer direct current magnetic bias - Google Patents

Device and method of on-line monitoring of transformer direct current magnetic bias Download PDF

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Publication number
CN103197178A
CN103197178A CN2013100932266A CN201310093226A CN103197178A CN 103197178 A CN103197178 A CN 103197178A CN 2013100932266 A CN2013100932266 A CN 2013100932266A CN 201310093226 A CN201310093226 A CN 201310093226A CN 103197178 A CN103197178 A CN 103197178A
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China
Prior art keywords
transformer
magnetic bias
neutral point
line monitoring
circuit
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CN2013100932266A
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Chinese (zh)
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CN103197178B (en
Inventor
高强
李平
耿宝宏
刘齐
钟丹田
原峰
潘丰厚
代继成
王茂军
程大伟
李艳丹
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辽宁省电力有限公司电力科学研究院
辽宁东科电力有限公司
国家电网公司
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Priority to CN201310093226.6A priority Critical patent/CN103197178B/en
Publication of CN103197178A publication Critical patent/CN103197178A/en
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Publication of CN103197178B publication Critical patent/CN103197178B/en

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Abstract

The invention belongs to the field of transformer on-line monitoring, and relates to a device and a method of on-line monitoring of transformer direct current magnetic bias. A hollow Hall current sensor is arranged outside an outer shell of the device of the on-line monitoring of the transformer direct current magnetic bias. A filter circuit, a voltage signal conditioning circuit, a gear switching circuit, a real-time clock system, a FLASH storage system and a controller system are arranged on a core plate inside the outer shell of the device of the on-line monitoring of the transformer direct current magnetic bias. A display screen is arranged on the outer shell of the device of the on-line monitoring of the transformer direct current magnetic bias. The display screen and the FLASH storage system are connected with the controller system. The device and the method of the on-line monitoring of the transformer direct current magnetic bias can be used for on-line monitoring of transformer neutral point grounding currents, wherein the device of the on-line monitoring of the transformer direct current magnetic bias has a function of real-time monitoring of transformer neutral point grounding current data and a function of over-limit alarm of the transformer neutral point grounding current data, and an alarm threshold can be set in a user-defined mode. When an abnormal situation occurs, both the display screen of the device of the on-line monitoring of the transformer direct current magnetic bias and a computer which monitors in a distant mode send alarm signals, workers can timely take treatment measures, faults of a transformer are prevented from happening, and stable operation of an electric system is ensured.

Description

Transformer DC magnetic bias on-Line Monitor Device and monitoring method thereof
Technical field
The invention belongs to the transformer online monitoring field, relate to a kind of intelligent transformer DC magnetic bias on-Line Monitor Device and monitoring method thereof.
Background technology
Along with expanding economy, high voltage direct current (HVDC) transmission system is just obtaining more and more widely application in China.Compare with AC transmission system, direct current transportation has that cost is low, loss is little, withstand voltage height, capacity is big and can realize characteristics such as the asynchronous networking of electric system.Trans-regional in order to realize, remote and big capacity send electricity, will have more UHV (ultra-high voltage) and even extra-high voltage direct-current engineering to build up and put into operation.
But the electric network composition of AC and DC mixed running make between the AC and DC system influence each other also all the more obvious.When DC transmission system one pole the earth or bipolar off-center operation, DC current will be injected the earth by earthing pole, DC current is invaded AC system by the transformer neutral point ground wire in the ground, and AC system is exerted an influence, and wherein remarkable influence causes the transformer DC magnetic bias phenomenon exactly.In addition, the earth magnetism " storm " that the dynamic change of sun plasma wind and terrestrial magnetic field interaction produce can cause geomagnetic induction current, and geomagnetic induction current also can produce DC magnetic biasing in the centre-point earth transformer.
The DC current Transformer Winding of flowing through produces certain direct current flux in the transformer fe interior portion, makes the exciting current positive-negative half-cycle obviously asymmetric, and magnetic flux is offset, the generation DC magnetic biasing.DC magnetic biasing can cause transformer magnetizing current sharply to increase, and causes that magnetic loop takes place overheated and noise and vibration increase.Under the DC magnetic biasing situation, tangible odd ripple noise appears in the frequency spectrum of transformer noise, and the problem that the height that causes vibration brings may cause the loosening of the interior relevant parts of transformer, and then threatens the safe operation of transformer.
Therefore need monitor DC magnetic biasing, eliminate magnetic bias for control in the future the basis is provided.On the neutral point lead-in wire of relevant main-transformer, the neutral point direct current current monitoring device is installed, the DC current that monitoring causes because of factors such as direct current transportation and sun magnetic storms, a situation arises and current values in order in time grasp DC magnetic bias current, and for taking to limit the necessary condition of measure creation of DC magnetic bias current.
Summary of the invention
At above-mentioned problems of the prior art, the invention provides a kind of transformer DC magnetic bias on-Line Monitor Device and monitoring method thereof, its objective is situation occurred and the current value of the DC magnetic biasing phenomenon that monitoring causes neutral grounded transformer because of factors such as direct current transportation and sun magnetic storms, be convenient to grasp the rule that the DC magnetic biasing phenomenon takes place, for necessary condition is created in the measure of taking to limit DC magnetic bias current.
The present invention is achieved through the following technical solutions:
The transformer DC magnetic bias on-Line Monitor Device, be the outside that is arranged on crust of the device by the punching Hall current sensor, filtering circuit, voltage signal modulate circuit, gear switch circuit and real-time clock system, FLASH storage system and controller system are arranged on the interior core board of crust of the device; Display screen is arranged on the crust of the device, and display screen and FLASH storage system are connected to controller system;
Wherein the punching Hall current sensor links to each other with crust of the device by cable, be connected with the gear switch circuit of crust of the device inside by crust of the device again, the gear switch circuit is connected to filtering circuit and voltage signal modulate circuit again, is connected to controller system with the real-time clock system then.
Described punching Hall current sensor links to each other with aviation plug on the crust of the device by cable.
Also be provided with data communication system on the described controller system.
Described punching Hall current sensor is the opening installation form.
The switching range of described gear switch circuit has three kinds, is respectively 100mA-1A, 1A-10A and 10A-50A.
Described punching Hall current sensor is to be fastenedly connected by the sensor of sensor openings fastening screw to two half block structures.
Transformer DC magnetic bias on-line monitoring method, be not change under the prerequisite of grounding mode of transformer neutral-point, by the electric current of flowing through on the on-line monitoring transformer neutral point ground lead, the electric current that reflects the Transformer Winding of flowing through, and then the DC magnetic biasing degree of reflection transformer, concrete steps are as follows:
(1) under the prerequisite that does not disconnect the transformer neutral point ground lead, the punching Hall current sensor that employing can opening is sleeved on the transformer neutral point ground lead, obtains the current signal of the transformer neutral point ground lead of flowing through;
(2) be voltage signal by the punching Hall current sensor with transformer neutral point ground current signal transition;
(3) with voltage signal by after filtering circuit, modulate circuit and the gear switch processing of circuit, the analog to digital conversion circuit of sending into controller carries out computing, obtains digitized transformer neutral point ground current;
(4) display screen of the digital signal in the step (3) at device shown, and compare with predefined transformer neutral point ground current permissible value, if greater than permissible value, the signal of display alarm simultaneously on the display screen;
(5) in step (4), current measurement result and time are saved in the FLASH storer of device, be convenient to subsequent analysis transformer DC magnetic bias situation;
(6) by the RS485 bus real time data or the historical data that step (3) calculates uploaded to background monitoring computing machine or comprehensive monitoring unit or IED, computing machine or IED carry out various correlation parameter configurations by communication protocol to monitoring device, to satisfy the on-line monitoring demand of dissimilar transformers.
The flow through method of transformer neutral point ground lead DC current of described measurement is as follows:
U 1 = I 1 K R
Wherein, I 1Be the DC current on the transformer neutral point ground lead;
K is the built-in amplification coefficient of punching Hall current sensor;
R is the built-in sampling resistor of punching Hall current sensor;
U 1Be punching Hall current sensor sampling and outputting voltage signal.
K and R can get different values by the punching Hall current sensor that dissimilar transformers are satisfied in customization, satisfy many-sided needs.
Describedly obtain digitized transformer neutral point ground current, the specific implementation method is as follows:
U 2 = U 1 R 1 R 2
Wherein, U 2Be U 1Amplify N magnitude of voltage doubly after filtration behind wave circuit, the modulate circuit, According to U 2Size, the gear switch circuit is automatically selected different ranges, the numerical value of N changes thereupon;
If the reference voltage of controller AD sample circuit is U Ref, switch different ranges by the numerical value of adjusting N, guarantee U 2All the time drop on [0, U Ref] in the interval;
By the AD conversion, obtain voltage U 2Numerical value is handled and oppositely derivation by multiple averaging, and what obtain namely is transformer neutral point ground current numerical value, namely
I 1 = KR 2 R 1 R U 2
Described gear switch circuit can be realized 100mA-1A, 1A-10A and 10A-50A.
Advantage of the present invention and beneficial effect are:
The present invention can be used for the on-line monitoring of transformer neutral point ground current, wherein monitoring device has the monitoring of transformer neutral point ground current data in real time and overload alarm function, alarm threshold 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 in time take treatment measures, avoid the generation of transformer fault, guarantee the stable operation of electric system.
By the enforcement of technical solution of the present invention, can really realize the accurate and stable real-time measurement to the transformer neutral point ground current.Method for designing of the present invention has following innovative point:
One, the innovation of measuring method:
1, but this device is to be sleeved on the current signal of measuring on the transformer neutral point ground lead on the neutral ground line by the punching Hall current sensor that adopts high-precision opening installation form, the method can truly reflect production and the numerical values recited of DC current on the transformer neutral point ground lead, this device and transformer are not electrically connected, need not take neutral ground lead-in wire apart, the operation of transformer is not produced any influence;
2, the electric signal of punching Hall current sensor output directly inserts measurement mechanism, carries out analytical calculation by Digital Signal Processing to obtaining electric signal, and result of calculation stored and shows.The operations staff can check measurement data and warning message etc. on the spot.
3, during the transformer operate as normal, the neutral ground electric current is very little, different transformers is according to differences such as core material, magnetic flux density design value, transformer device structures, the ground current of neutral point of allowing to flow through is also different, be one ampere to about several amperes during operate as normal, but when the DC magnetic biasing phenomenon produced, the transformer neutral point ground current will increase, become several amperes to tens amperes, variation range is very big.
This device has also designed current range gearshift change-over switch, and according to the scope that electric current changes, device can be regulated suitable gear automatically and measure electric current, has guaranteed the accuracy of measurement and the security of measurement mechanism.This device current measuring range is 50A to the maximum, and measuring accuracy 1% has satisfied the requirement of dissimilar transformer neutral point ground current measurement ranges and precision fully.
Two, apparatus structure and mounting means: the measurement of this device, demonstration and storage area are contained in the crust of the device of a casting aluminium material, offered display window at the crust of the device top cover, be used for installing display screen, be convenient to the field observation current data, crust of the device part independent grounding is used for the extraneous electromagnetic interference (EMI) of shielding.
This apparatus structure is compact to design, and good looking appearance on mounting means, adopts suspension member by crust of the device to be directly installed near the transformer neutral point ground lead mode, and installation method is easy, and safety is convenient to the operations staff operation and maintenance is installed.
1, 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.
2, device has data storage function, and temporal information and real-time current data are kept in the FLASH storage system that device carries, and the data power down of storage is not lost, and can preserve the measurement data more than a year continuously.Be the historical data of subsequent analysis calculating transformer neutral ground electric current, understanding the neutral ground current variation provides foundation.
3, device is supported the RS-232/485 communication interface, can realize the multiple spot monitoring based on the RS485 bus.Adopt 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.
4, 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.
5, 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.
6, electromagnetic compatibility and holding circuit design.Because the electromagnetic environment at transformer station scene is very abominable, it is unusual that high voltage and high-intensity magnetic field make that very easily this monitoring equipment work occurs, and therefore the electromagnetic compatibility to this device has carried out careful design.By the checking of EMC test, this device meets State Grid Corporation of China fully to the standard-required of the compatible aspect of installation electromagnetical, comprises static discharge, electrical fast transient (eft), surge impact etc., has improved security and the reliability of device work.
7, apparatus of the present invention are aesthetic in appearance, and are simple to operate, easy for installation, stable, and Hall current sensor can customize according to the neutral point lead format, are suitable for different scenes and install and use.
The present invention have the storage of real time on-line monitoring transformer neutral point ground current, data, demonstration and teletransmission on the spot, off-limit alarm, system to the time and function such as parameter configuration.Popularization along with direct current transportation, application of the present invention more and more widely, be applicable to the transformer of number of different types, for the normal operation of neutral grounded transformer provides foundation and certain guarantee, and provide the data support for generation rule and the numerical values recited of analyzing neutral grounded transformer DC magnetic biasing phenomenon.
Description of drawings
The present invention will be further described in detail below in conjunction with the drawings and specific embodiments.
Fig. 1 is principle of work synoptic diagram of the present invention;
Fig. 2 is functional block diagram of the present invention;
Fig. 3 is networking structure synoptic diagram of the present invention;
Fig. 4 is inner structure synoptic diagram of the present invention;
Fig. 5 is external structure synoptic diagram of the present invention;
Fig. 6 is outside perspective view of the present invention;
Fig. 7 is punching Hall current sensor structural representation among the present invention.
Among the figure: crust of the device 1, aviation plug 2, core board 3, display screen 4, punching Hall current sensor 5, sensor openings fastening screw 6.
Embodiment
The present invention is a kind of transformer DC magnetic bias on-Line Monitor Device and monitoring method thereof, and as shown in Figure 2, Fig. 2 is the functional block diagram of line monitoring device of the present invention; And for example shown in Fig. 4-7, Fig. 4, Fig. 5, Fig. 6 and Fig. 7 are respectively inner structure synoptic diagram, external structure synoptic diagram, outside perspective view and the punching Hall current sensor structural representation of on-Line Monitor Device of the present invention.
But on-Line Monitor Device of the present invention comprises punching Hall current sensor 5, filtering circuit, gear switch circuit, voltage signal modulate circuit and real-time clock system, FLASH storage system, EEPROM storage system and controller system and display screen and the data communication system of opening.
But monitoring device of the present invention is to be arranged on the outside of crust of the device 1 by installation form for the punching Hall current sensor of opening, and filtering circuit, voltage signal modulate circuit, gear switch circuit and real-time clock system, FLASH storage system and controller system are arranged on the core board 3 of crust of the device 1 inside; Display screen 4 is arranged on the crust of the device 1.Display screen and FLASH storage system are connected to controller system; Wherein punching Hall current sensor 5 links to each other with aviation plug 2 on the crust of the device 1 by cable, aviation plug 2 is connected with the gear switch circuit of crust of the device 1 inside, the gear switch circuit is connected to filtering circuit and voltage signal modulate circuit again, is connected to controller system with the real-time clock system then.Also be provided with data communication system on the described controller system.The switching range of described gear switch circuit has three kinds, is respectively 100mA-1A, 1A-10A and 10A-50A.
In addition, the service cable of device and telecommunication cable link to each other with device by aviation plug 2, have guaranteed power supply and reliable communications to have realized water proof and dust proof protection etc. to installing inside on the other hand on the one hand.Punching Hall current sensor 5 can opening, can under the situation that does not disconnect the transformer neutral point ground lead punching Hall current sensor 5 be sleeved on the transformer neutral point ground lead, easy for installation, in order to guarantee the measuring accuracy of punching Hall current sensor, need to use the sensor of 6 pairs of two half block structures of sensor openings fastening screw to carry out fastening processing.
This on-Line Monitor Device is that the punching Hall current sensor with opening is sleeved on the transformer neutral point ground lead when specifically implementing, the metering circuit of the secondary singal access device of punching Hall current sensor output, metering circuit is made of filtering circuit, gear switch control circuit and voltage signal modulate circuit.Metering circuit is sent conditioned simulating signal into controller and is carried out computing, and result of calculation is presented on the display screen, and is stored in the FLASH accumulator system, for the rule of subsequent analysis transformer DC magnetic bias phenomenon provides the data support.In addition, this on-Line Monitor Device can link to each other with on-line monitoring comprehensive monitoring unit (IED) or computing machine, and by MODBUS communication protocol measurement result is uploaded, computing machine can wait the serial ports instrument that parameters such as the communication of device, measurement, warning, calibration are configured by AccessPort assistant.
As shown in Figure 3, Fig. 3 is networking structure synoptic diagram of the present invention, a plurality of transformer DC magnetic bias on-Line Monitor Device of bottom are by realizing data communication between RS-485 bus and on-line monitoring IED and the on-line monitoring computing machine, this on-Line Monitor Device can be uploaded to on-line monitoring IED and on-line monitoring computing machine with real time data and warning message, on-line monitoring IED and on-line monitoring computing machine can read the measurement data of bottom device simultaneously, and the bottom device is carried out relevant configuration.
As shown in Figure 1, Fig. 1 is principle of work synoptic diagram of the present invention, by being sleeved on, the punching Hall current sensor obtains the transformer DC magnetic bias current value on the transformer neutral point ground lead, device to this current signal gather, computing and store on the spot and show, and communicate by data communication system and on-line monitoring IED or monitoring computer.
The concrete course of work of the present invention is as follows: the punching Hall current sensor is given filtering circuit and gear switch circuit with the neutral point current signal that collects, pass to the voltage signal modulate circuit again after adjusting to suitable range, analog to digital conversion circuit by controller carries out computing with this signal then, the result of calculation that obtains is presented on the display screen of device on the one hand, the collection that produces with the real-time clock system constantly is deposited into the FLASH storage system together on the other hand, for subsequent analysis neutral ground current variation provides foundation.Device can be preset the alarming value of neutral ground electric current, when result of calculation surpassed default alarming value, warning message showed that teletransmission is to the background monitoring computing machine on the other hand in that device is local on the one hand, remind the operations staff to take measures to handle, the generation of prevention transformer fault.Data communication system is except being uploaded to warning message supervisory control comuter or comprehensive monitoring unit or the IED by the RS485 bus, also the real time data that controller can be calculated or the historical data that is stored among the FLASH are uploaded, and computing machine or IED can carry out various parameter configuration to monitoring device by communication protocol, to satisfy the demand of different size transformer.
Transformer DC magnetic bias on-line monitoring method is, under the prerequisite that does not change grounding mode of transformer neutral-point, by the electric current of flowing through on the on-line monitoring transformer neutral point ground lead, the electric current that reflects the Transformer Winding of flowing through, and then the DC magnetic biasing degree of reflection transformer, concrete steps are as follows:
(1) under the prerequisite that does not disconnect the transformer neutral point ground lead, the punching Hall current sensor that employing can opening is sleeved on the transformer neutral point ground lead, obtains the current signal of the transformer neutral point ground lead of flowing through;
(2) be voltage signal by the punching Hall current sensor with transformer neutral point ground current signal transition;
(3) with voltage signal by after filtering circuit, modulate circuit and the gear switch processing of circuit, the analog to digital conversion circuit of sending into controller carries out computing, obtains digitized transformer neutral point ground current;
(4) display screen of the digital signal in the step (3) at device shown, and compare with predefined transformer neutral point ground current permissible value, if greater than permissible value, the signal of display alarm simultaneously on the display screen;
(5) in step (4), current measurement result and time are saved in the FLASH storer of device, be convenient to subsequent analysis transformer DC magnetic bias situation.
(6) by the RS485 bus real time data or the historical data that step (3) calculates uploaded to background monitoring computing machine or comprehensive monitoring unit or IED, computing machine or IED carry out various correlation parameter configurations by communication protocol to monitoring device, to satisfy the on-line monitoring demand of dissimilar transformers.
The flow through method of transformer neutral point ground lead DC current of wherein said measurement is as follows:
U 1 = I 1 K R
Wherein, I 1Be the DC current on the transformer neutral point ground lead;
K is the built-in amplification coefficient of punching Hall current sensor;
R is the built-in sampling resistor of punching Hall current sensor;
U 1Be punching Hall current sensor sampling and outputting voltage signal.
K and R can get different values by the punching Hall current sensor that dissimilar transformers are satisfied in customization, satisfy many-sided needs.
Wherein saidly obtain digitized transformer neutral point ground current, the specific implementation method is as follows:
U 2 = U 1 R 1 R 2
Wherein, U 2Be U 1Amplify N magnitude of voltage doubly after filtration behind wave circuit, the modulate circuit, According to U 2Size, the gear switch circuit is automatically selected different ranges, the numerical value of N changes thereupon;
If the reference voltage of controller AD sample circuit is U Ref, switch different ranges by the numerical value of adjusting N, guarantee U 2All the time drop on [0, U Ref] in the interval;
By the AD conversion, obtain voltage U 2Numerical value is handled and oppositely derivation by multiple averaging, and what obtain namely is transformer neutral point ground current numerical value, namely
I 1 = KR 2 R 1 R U 2
Gear switch circuit described in the present invention can be realized 100mA-1A, 1A-10A and 10A-50A.
Under laboratory environment, the data that measure are as shown in table 1.
Table 1 laboratory measurement data
Once apply current source (A) Device shows result (A) The device demonstration time
0.50 0.50 2012-9-1610:08
1.00 1.01 2012-9-1610:10
2.00 1.99 2012-9-1610:12
5.00 5.03 2012-9-1610:14
8.00 7.95 2012-9-1610:16
10.00 9.97 2012-9-1610:18
15.00 15.12 2012-9-1610:20

Claims (10)

1. transformer DC magnetic bias on-Line Monitor Device is characterized in that:
Punching Hall current sensor (5) is arranged on the outside of crust of the device (1), and filtering circuit, voltage signal modulate circuit, gear switch circuit and real-time clock system, FLASH storage system and controller system are arranged on the interior core board (3) of crust of the device (1); Display screen (4) is arranged on the crust of the device (1), and display screen and FLASH storage system are connected to controller system;
Wherein the punching Hall current sensor links to each other with crust of the device (1) by cable, be connected by the inner gear switch circuit of crust of the device (1) and crust of the device (1) again, the gear switch circuit is connected to filtering circuit and voltage signal modulate circuit again, is connected to controller system with the real-time clock system then.
2. transformer DC magnetic bias on-Line Monitor Device according to claim 1 is characterized in that: described punching Hall current sensor (5) links to each other with aviation plug (2) on the crust of the device (1) by cable.
3. transformer DC magnetic bias on-Line Monitor Device according to claim 1 is characterized in that: also be provided with data communication system on the described controller system.
4. transformer DC magnetic bias on-Line Monitor Device according to claim 1, it is characterized in that: described punching Hall current sensor (5) is the opening installation form.
5. transformer DC magnetic bias on-Line Monitor Device according to claim 1, it is characterized in that: the switching range of described gear switch circuit has three kinds, is respectively 100mA-1A, 1A-10A and 10A-50A.
6. transformer DC magnetic bias on-Line Monitor Device according to claim 1, it is characterized in that: described punching Hall current sensor (5) is to be fastenedly connected by the sensor of sensor openings fastening screw (6) to two half block structures.
7. transformer DC magnetic bias on-line monitoring method, it is characterized in that: do not change under the prerequisite of grounding mode of transformer neutral-point, by the electric current of flowing through on the on-line monitoring transformer neutral point ground lead, the electric current that reflects the Transformer Winding of flowing through, and then the DC magnetic biasing degree of reflection transformer, concrete steps are as follows:
(1) under the prerequisite that does not disconnect the transformer neutral point ground lead, the punching Hall current sensor that employing can opening is sleeved on the transformer neutral point ground lead, obtains the current signal of the transformer neutral point ground lead of flowing through;
(2) be voltage signal by the punching Hall current sensor with transformer neutral point ground current signal transition;
(3) with voltage signal by after filtering circuit, modulate circuit and the gear switch processing of circuit, the analog to digital conversion circuit of sending into controller carries out computing, obtains digitized transformer neutral point ground current;
(4) display screen of the digital signal in the step (3) at device shown, and compare with predefined transformer neutral point ground current permissible value, if greater than permissible value, the signal of display alarm simultaneously on the display screen;
(5) in step (4), current measurement result and time are saved in the FLASH storer of device, be convenient to subsequent analysis transformer DC magnetic bias situation;
(6) by the RS485 bus real time data or the historical data that step (3) calculates uploaded to background monitoring computing machine or comprehensive monitoring unit or IED, computing machine or IED carry out various correlation parameter configurations by communication protocol to monitoring device, to satisfy the on-line monitoring demand of dissimilar transformers.
8. transformer DC magnetic bias on-line monitoring method according to claim 7 is characterized in that:
The flow through method of transformer neutral point ground lead DC current of described measurement is as follows:
U 1 = I 1 K R
Wherein, I 1Be the DC current on the transformer neutral point ground lead;
K is the built-in amplification coefficient of punching Hall current sensor;
R is the built-in sampling resistor of punching Hall current sensor;
U 1Be punching Hall current sensor sampling and outputting voltage signal.
K and R can get different values by the punching Hall current sensor that dissimilar transformers are satisfied in customization, satisfy many-sided needs.
9. transformer DC magnetic bias on-line monitoring method according to claim 7 is characterized in that:
Describedly obtain digitized transformer neutral point ground current, the specific implementation method is as follows:
U 2 = U 1 R 1 R 2
Wherein, U 2Be U 1Amplify N magnitude of voltage doubly after filtration behind wave circuit, the modulate circuit, According to U 2Size, the gear switch circuit is automatically selected different ranges, the numerical value of N changes thereupon;
If the reference voltage of controller AD sample circuit is U Ref, switch different ranges by the numerical value of adjusting N, guarantee U 2All the time drop on [0, U Ref] in the interval;
By the AD conversion, obtain voltage U 2Numerical value is handled and oppositely derivation by multiple averaging, and what obtain namely is transformer neutral point ground current numerical value, namely
I 1 = KR 2 R 1 R U 2
10. transformer DC magnetic bias on-line monitoring method according to claim 7, it is characterized in that: described gear switch circuit can be realized 100mA-1A, 1A-10A and 10A-50A.
CN201310093226.6A 2013-03-21 2013-03-21 Transformer DC magnetic bias on-Line Monitor Device and monitoring method thereof CN103197178B (en)

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CN103558449A (en) * 2013-11-02 2014-02-05 国家电网公司 On-line monitoring device of double mutual inductors of grounding current of clamp of transformer
CN103956720A (en) * 2014-05-13 2014-07-30 国网上海市电力公司 Wireless transformer neutral point current monitoring device
CN104133130A (en) * 2014-07-11 2014-11-05 中国南方电网有限责任公司超高压输电公司检修试验中心 Transformer direct-current magnetic bias current calculation method and system based on fault recording data
CN104808049A (en) * 2015-05-12 2015-07-29 中国电力科学研究院 Portable transformer neutral point current monitoring device
CN105353200A (en) * 2015-12-10 2016-02-24 国网四川省电力公司电力科学研究院 On-line monitoring system for DC magnetic bias current of transformer
CN105629125A (en) * 2014-10-30 2016-06-01 国家电网公司 Transformer DC magnetic bias detecting apparatus
CN106291164A (en) * 2016-07-22 2017-01-04 国家电网公司 Noise measuring is utilized to judge the method and system of transformer DC magnetic bias state
CN106324406A (en) * 2016-09-21 2017-01-11 许继集团有限公司 Transformer direct-current magnetic bias fault diagnosis method and device
CN108957183A (en) * 2018-07-05 2018-12-07 北京国网富达科技发展有限责任公司 Transformer DC magnetic bias monitoring method and device
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CN109116169A (en) * 2018-08-03 2019-01-01 西南交通大学 The detection and analysis device and its determination method of power transformer D.C. magnetic biasing
CN110261665A (en) * 2019-07-31 2019-09-20 国网信息通信产业集团有限公司 Transformer DC magnetic bias on-line monitoring system
CN110632372A (en) * 2019-08-26 2019-12-31 深圳供电局有限公司 Monitoring method for direct current magnetic bias of power transformer

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