CN205049724U - Sky device is put to electric current of transformer core earth current on -line monitoring equipment - Google Patents
Sky device is put to electric current of transformer core earth current on -line monitoring equipment Download PDFInfo
- Publication number
- CN205049724U CN205049724U CN201520829444.6U CN201520829444U CN205049724U CN 205049724 U CN205049724 U CN 205049724U CN 201520829444 U CN201520829444 U CN 201520829444U CN 205049724 U CN205049724 U CN 205049724U
- Authority
- CN
- China
- Prior art keywords
- signal
- current
- module
- separation
- iron core
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn - After Issue
Links
- 238000012544 monitoring process Methods 0.000 title claims abstract description 23
- 238000000926 separation method Methods 0.000 claims abstract description 71
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 63
- 238000012806 monitoring device Methods 0.000 claims abstract description 21
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 14
- 238000003786 synthesis reaction Methods 0.000 claims abstract description 14
- 230000003750 conditioning effect Effects 0.000 claims abstract description 13
- 238000005070 sampling Methods 0.000 claims abstract description 9
- 230000003321 amplification Effects 0.000 claims abstract description 4
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 4
- 230000010363 phase shift Effects 0.000 claims description 18
- 239000002131 composite material Substances 0.000 claims description 7
- 238000013519 translation Methods 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 9
- 238000005259 measurement Methods 0.000 description 6
- 238000012360 testing method Methods 0.000 description 4
- 238000012795 verification Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Landscapes
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
The utility model provides a sky device is put to electric current of transformer core earth current on -line monitoring equipment, move phase module, separation signal amplitude modulation and synthesis module, current amplification output module, signal frequency tracking module and feedback control module including iron core earth current signal sampling conditioning module, signal harmonic separating module, separation signal. The utility model discloses can offset the original electric current of operating iron core earth current monitoring devices and put the sky, return " zero current " state of calibrating in the laboratory when being convenient for the check -up of iron core earth current monitoring devices, improve calibration process's the degree of accuracy.
Description
Technical field
The utility model relates to high-voltage metering technical field, and specifically a kind of electric current of transformer iron core grounding current on-line monitoring equipment puts sky device.
Background technology
Transformer iron core grounding current on-line monitoring equipment, can the operating transformer iron core grounding current of Real-Time Monitoring, and the unusual service conditions such as timely early warning multipoint earthing of iron core, are widely used at present.The ultimate principle of iron core grounding current on-line monitoring utilizes pincerlike current sensor to monitor the electric current flow through in iron core grounding band steel, when electric current increases above early warning value, sends a warning, and prompting operations staff investigates hidden danger or fault further.
By relevant enterprise standard (Q/GDW540.1-2010 " converting equipment on-line monitoring unit check specification ") and industry standard (DL/T1433-2005 " transformer iron core grounding current measurement mechanism general technical specifications ") requirement, iron core grounding current monitoring device should carry out regular calibration, to judge its Monitoring Data whether accurate and effective.Due to monitoring device once dress use, be difficult to power failure dismounting censorship, therefore, need effective field test method and apparatus badly.
At present, domestic have bibliographical information to the field test of capacity current monitoring device and lightning arrester Leakage Current monitoring device, and its basic thought is the adjustable electric current of injection one, according to the response of monitoring device to this electric current, carries out calibrating and detecting.The accuracy of this method is lower, because the equipment state amount that monitoring device itself measures, and there is phase difference between the electric current injected, can disturb the signal of injection.The utility model people of the application finds through research: the field-checking technology of aforementioned capacity current monitoring device and lightning arrester Leakage Current monitoring device, in principle also portable in the field calibration of transformer iron core grounding current on-Line Monitor Device, but, because transformer iron core grounding current is very little, for milliampere level, and containing abundant harmonic wave; Carry out field calibration to mixing current faint like this, the magnitude of current that monitoring device itself measures can affect the accuracy of calibration greatly.And the open science report that there is no at present the verification of iron core grounding current on-line monitoring device context.The utility model people of the application studies further and finds that a kind of feasible new approaches are that the original current canceling of operating iron core grounding current monitoring device is put sky, and make it revert to " zero current " state of laboratory investment, then Injection Current verifies.Under this method, putting empty effect will directly affect the accuracy of calibration process, and put sky after-current more close to zero, accuracy is higher.The utility model is just based on this, and electric current when proposing the verification of a kind of transformer iron core grounding current on-line monitoring device context puts short side method and device.
Utility model content
The utility model provides a kind of electric current of transformer iron core grounding current on-line monitoring equipment to put sky device, the original current canceling of operating iron core grounding current monitoring device can be put sky, revert to " zero current " state of laboratory investment when being convenient to the verification of iron core grounding current monitoring device, improve the accuracy of calibration process.
A kind of electric current of transformer iron core grounding current on-line monitoring equipment puts sky device, comprise iron core grounding current sample of signal conditioning module, signal harmonic separation module, separation signal phase shift block, separation signal amplitude modulation and synthesis module, Current amplifier output module, signal frequency tracking module and feedback control module
Described iron core grounding current sample of signal conditioning module be used for on-the-spot iron core grounding current is sampled, I/V conversion and amplify after export sampled signal, its output terminal is connected with the input end of described signal harmonic separation module;
Described signal harmonic separation module is for realizing the first-harmonic and 3 of sampled signal, 5, the separation of 7 order harmonic components obtains separation signal, its first output terminal is connected with the input end of described signal frequency tracking module, for isolated fundamental signal is exported to described signal frequency tracking module, second output terminal of described signal harmonic separation module is connected with the input end of described separation signal phase shift block, for exporting described separation signal;
Described signal frequency tracking module is used for real-time follow-up fundamental signal frequency, and its output terminal is connected with the input end of described feedback control module;
The fundamental signal frequency that described feedback control module is used for obtaining according to described signal frequency tracking module regulates the parameter of described signal harmonic separation module automatically, realize the separation of dynamic frequency signal, ensure that signal does not produce phase shift through signal harmonic separation module;
Described separation signal phase shift block is for realizing the phase place adjustment of separation signal, export the separation signal after adjustment phase place, make each component signal after adjustment and each component signal same-phase of former limit iron core grounding current, its output terminal is connected with the input end of described separation signal amplitude modulation and synthesis module;
Described separation signal amplitude modulation and synthesis module are for realizing range-adjusting and the superposition of the separation signal after adjusting phase place, and export composite signal, its output terminal is connected with the input end of described Current amplifier output module;
Described Current amplifier output module is for realizing the power amplification of described composite signal, and output current first-harmonic and 3,5, first-harmonic and 3 in 7 subharmonic amplitudes and former limit iron core grounding current, 5, the current signal of the amplitudes such as 7 subharmonic amplitudes, namely the image current of the same homophase frequently of described and on-the-spot transformer iron core grounding current, makes iron core grounding current on-line monitoring device sensor electric current put sky.
Further, described iron core grounding current sample of signal conditioning module comprises by the high precision connected successively pincerlike current sensor, I/V translation circuit and operational amplifier, the pincerlike current sensor of high precision is used for carrying out current sampling to on-the-spot iron core grounding current, I/V translation circuit is used for sampling current signal to be transformed to voltage signal, and operational amplifier obtains described sampled signal after being amplified by voltage signal.
The beneficial effects of the utility model are:
1, the utility model is based on harmonic separation and phase shift, achieves tracking and the counteracting of iron core grounding current, puts empty method for field-checking provides electric current.
2, when the utility model solves the verification of iron core grounding current on-line monitoring device context, operating iron core grounding current, to the interference problem of calibration current, improves the accuracy of field-checking.
3, the utility model adopt sample of signal, offset and inject the mode of complete electrical isolation of have employed, do not affect the operation of transformer and on-line monitoring equipment.
Accompanying drawing explanation
Fig. 1 is the schematic block circuit diagram that the electric current of the utility model transformer iron core grounding current on-line monitoring equipment puts sky device;
Fig. 2 be in the utility model signal harmonic be separated, the schematic diagram of phase shift and superposition;
Fig. 3 is certain 500kV transformer station iron core grounding current raw measurement data oscillogram, and wherein CH1 is original measurement current waveform, and CH2 puts the empty cancellation current waveform injected;
Fig. 4 is the current waveform figure after sky put by the sensor of transformer iron core grounding current on-line monitoring equipment.
In figure: 1.1-iron core grounding current sample of signal conditioning module, 1.2-signal harmonic separation module, 1.3-separation signal phase shift block, the amplitude modulation of 1.4-separation signal and synthesis module, 1.5-Current amplifier output module, 1.6-signal frequency tracking module, 1.7-feedback control module.
Embodiment
Below in conjunction with the accompanying drawing in the utility model, the technical scheme in the utility model is clearly and completely described.
As shown in Figure 1, the utility model provides a kind of electric current of transformer iron core grounding current on-line monitoring equipment to put sky device, comprises iron core grounding current sample of signal conditioning module 1.1, signal harmonic separation module 1.2, separation signal phase shift block 1.3, separation signal amplitude modulation and synthesis module 1.4, Current amplifier output module 1.5, signal frequency tracking module 1.6 and feedback control module 1.7.
Described iron core grounding current sample of signal conditioning module 1.1 for sampling on-the-spot iron core grounding current, I/V conversion and amplify after export sampled signal, its output terminal is connected with the input end of described signal harmonic separation module 1.2;
Described signal harmonic separation module 1.2 is for realizing the first-harmonic and 3 of sampled signal, 5, the separation of 7 order harmonic components obtains separation signal, its first output terminal is connected with the input end of described signal frequency tracking module 1.6, for isolated fundamental signal is exported to described signal frequency tracking module 1.6.
Described signal frequency tracking module 1.6 is for real-time follow-up fundamental signal frequency, and its output terminal is connected with the input end of described feedback control module 1.7; Described feedback control module 1.7 regulates the parameter resistance value of bandpass filter (in the such as signal harmonic separation module 1.2) of described signal harmonic separation module 1.2 automatically for the fundamental signal frequency obtained according to described signal frequency tracking module 1.6, realize the separation of dynamic frequency signal, ensure that signal does not produce phase shift when signal harmonic separation module 1.2.
Incorporated by reference to reference to figure 2, the second output terminal of described signal harmonic separation module 1.2 is connected with the input end of described separation signal phase shift block 1.3, for exporting described separation signal; Described separation signal phase shift block 1.3 is for realizing separation signal (i.e. first-harmonic and 3,5,7 order harmonic components) phase place adjustment, make each component signal after adjustment and each component signal same-phase of former limit iron core grounding current, export the separation signal after adjustment phase place, its output terminal is connected with the input end of described separation signal amplitude modulation and synthesis module 1.4; Described separation signal amplitude modulation and synthesis module 1.4 are for realizing range-adjusting and the superposition of the separation signal after adjusting phase place, and export composite signal, its output terminal is connected with the input end of described Current amplifier output module 1.5;
Described Current amplifier output module 1.5 is for realizing the power amplification of described composite signal, and output current first-harmonic and 3, the first-harmonic and 3 in 5,7 subharmonic amplitudes and former limit iron core grounding current, the current signal I of the amplitudes such as 5,7 subharmonic amplitudes
0(namely with the image current of on-the-spot transformer iron core grounding current with frequency homophase).
Described iron core grounding current sample of signal conditioning module 1.1 can comprise by the high precision connected successively pincerlike current sensor, I/V translation circuit and operational amplifier, first the pincerlike current sensor of high precision is adopted to carry out current sampling to on-the-spot iron core grounding current, then by I/V translation circuit, sampling current signal is transformed to voltage signal, and obtains described sampled signal after being amplified by operational amplifier.
Described signal harmonic separation module 1.2 is made up of bandpass filter, the resistance of bandpass filter is made up of digital potentiometer, first-harmonic and 3 can be isolated from the output signal of iron core grounding current sample of signal conditioning module 1.1,5,7 rd harmonic signal, the same amplitude of each harmonic component in isolated each harmonic signal and former mixed signal, same-phase.The phase shift that described separation signal phase shift block 1.3 is made up of amplifier and capacitance-resistance original paper is formed, and carries out displacement adjustment respectively to separation signal.
Described separation signal amplitude modulation and synthesis module 1.4, the reverse totalizer be made up of amplifier and adjustable resistance is formed, and carries out range-adjusting and superposition respectively to separation signal.By adjusting the adjustable resistance of described separation signal amplitude modulation and synthesis module 1.4, realize the current first harmonics and 3 that described Current amplifier output module 1.5 exports, the first-harmonic and 3 in 5,7 subharmonic amplitudes and former limit iron core grounding current, the amplitudes such as 5,7 subharmonic amplitudes.
The power amplifier that described Current amplifier output module 1.5 can be made up of field effect transistor is formed, and realizes Current amplifier and exports.
Described signal frequency tracking module 1.6 is high precision frequency meter, can measure fundamental signal frequency in real time.
Described feedback control module 1.7 is made up of logic control circuit and digital potentiometer, signal frequency tracking module 1.6 records the frequency of fundamental signal, then the resistance value of digital potentiometer in the bandpass filter of described signal harmonic separation module 1.2 is revised by logic control circuit and digital potentiometer, realize the change of the central point frequency following input current signal frequency of bandpass filter, ensure there is no phase differential between the output signal of bandpass filter and the respective component of former composite signal.
There is provided electric current to put sky device based on the utility model, the electric current certain 500kV transformer station having been carried out to iron core grounding current on-line monitoring equipment puts empty test.
Testing the 500kV transformer model chosen is ODFS-334MVA/500kV, and the iron core grounding current monitoring device model of this transformer dress is iTMO-TX-2000, and its measurement range is 2mA-10A, and accuracy of measurement is ± (5% reading+0.1mA).When measuring at the scene, this transformer operating load is 49MVA, has put into operation 6 years.
During site test, first utilize iron core grounding current sample of signal conditioning module 1.1 of the present utility model to on-the-spot iron core grounding current I
0sample, obtaining current value is 2.7mA, and wherein 99% is power current component, and its waveform to be shown in accompanying drawing 3 shown in CH1.
Then electric current of the present utility model is utilized to put sky device, to I
0carry out filtering, frequency-tracking, gradation, phase shift, synthesis obtain inverse current I
1, and inject the pincerlike sensor of monitoring device in punching mode, the total current I after now utilizing the pincerlike sensors observe of standard to offset
2, effective value is about 0.02mA, and waveform as shown in Figure 4.This total current I
2intuitively can reflect electric current effect of " putting sky ".By 1/3 estimation of sample (on-line monitoring equipment) accuracy of measurement, put empty rear 0.02mA and can ignore on the impact of calibration process.Now, the registration of monitoring equipment is 0.00mA.As can be seen here, the utility model makes in the field-calibration process of iron core grounding current on-line monitoring equipment, electric current in monitoring equipment sensor has returned " zero current " state in laboratory, the filtering impact of monitoring equipment initial current on field calibration, improve the accuracy of calibration, achieve good effect.
Claims (2)
1. the electric current of a transformer iron core grounding current on-line monitoring equipment puts sky device, it is characterized in that: comprise iron core grounding current sample of signal conditioning module (1.1), signal harmonic separation module (1.2), separation signal phase shift block (1.3), separation signal amplitude modulation and synthesis module (1.4), Current amplifier output module (1.5), signal frequency tracking module (1.6) and feedback control module (1.7)
Described iron core grounding current sample of signal conditioning module (1.1) for sampling on-the-spot iron core grounding current, I/V conversion and amplify after export sampled signal, its output terminal is connected with the input end of described signal harmonic separation module (1.2);
Described signal harmonic separation module (1.2) is for realizing the first-harmonic and 3 of sampled signal, 5, the separation of 7 order harmonic components obtains separation signal, its first output terminal is connected with the input end of described signal frequency tracking module (1.6), for isolated fundamental signal being exported to described signal frequency tracking module (1.6), second output terminal of described signal harmonic separation module (1.2) is connected with the input end of described separation signal phase shift block (1.3), for exporting described separation signal;
Described signal frequency tracking module (1.6) is for real-time follow-up fundamental signal frequency, and its output terminal is connected with the input end of described feedback control module (1.7);
Described feedback control module (1.7) regulates the parameter of described signal harmonic separation module (1.2) automatically for the fundamental signal frequency obtained according to described signal frequency tracking module (1.6), realize the separation of dynamic frequency signal, ensure that signal does not produce phase shift when signal harmonic separation module (1.2);
Described separation signal phase shift block (1.3) is for realizing the phase place adjustment of separation signal, make each component signal after adjustment and each component signal same-phase of former limit iron core grounding current, export the separation signal after adjustment phase place, its output terminal is connected with the input end of described separation signal amplitude modulation and synthesis module (1.4);
Described separation signal amplitude modulation and synthesis module (1.4) are for realizing range-adjusting and the superposition of the separation signal after adjusting phase place, and export composite signal, its output terminal is connected with the input end of described Current amplifier output module (1.5);
Described Current amplifier output module (1.5) is for realizing the power amplification of described composite signal, and output current first-harmonic and 3,5, first-harmonic and 3 in 7 subharmonic amplitudes and former limit iron core grounding current, 5, the current signal of the amplitudes such as 7 subharmonic amplitudes, namely with the image current of on-the-spot transformer iron core grounding current with frequency homophase, makes iron core grounding current on-line monitoring device sensor electric current put sky.
2. the electric current of transformer iron core grounding current on-line monitoring equipment as claimed in claim 1 puts sky device, it is characterized in that: described iron core grounding current sample of signal conditioning module (1.1) comprises by the high precision connected successively pincerlike current sensor, I/V translation circuit and operational amplifier, the pincerlike current sensor of high precision is used for carrying out current sampling to on-the-spot iron core grounding current, I/V translation circuit is used for sampling current signal to be transformed to voltage signal, and operational amplifier obtains described sampled signal after being amplified by voltage signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520829444.6U CN205049724U (en) | 2015-10-23 | 2015-10-23 | Sky device is put to electric current of transformer core earth current on -line monitoring equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520829444.6U CN205049724U (en) | 2015-10-23 | 2015-10-23 | Sky device is put to electric current of transformer core earth current on -line monitoring equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205049724U true CN205049724U (en) | 2016-02-24 |
Family
ID=55343293
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520829444.6U Withdrawn - After Issue CN205049724U (en) | 2015-10-23 | 2015-10-23 | Sky device is put to electric current of transformer core earth current on -line monitoring equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205049724U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105242228A (en) * | 2015-10-23 | 2016-01-13 | 国家电网公司 | Current blanking method and device of transformer iron core grounding current online monitoring equipment |
| CN111025082A (en) * | 2019-11-22 | 2020-04-17 | 国网江苏省电力有限公司电力科学研究院 | Signal separation real-time processing method and system for two-in-one sensor |
| CN112485706A (en) * | 2019-09-12 | 2021-03-12 | 上海锐开电气有限公司 | Transformer core grounding current fundamental wave monitoring system capable of eliminating harmonic component |
-
2015
- 2015-10-23 CN CN201520829444.6U patent/CN205049724U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105242228A (en) * | 2015-10-23 | 2016-01-13 | 国家电网公司 | Current blanking method and device of transformer iron core grounding current online monitoring equipment |
| CN105242228B (en) * | 2015-10-23 | 2018-01-05 | 国家电网公司 | The electric current of transformer iron core grounding current on-line monitoring equipment is empty method and device |
| CN112485706A (en) * | 2019-09-12 | 2021-03-12 | 上海锐开电气有限公司 | Transformer core grounding current fundamental wave monitoring system capable of eliminating harmonic component |
| CN111025082A (en) * | 2019-11-22 | 2020-04-17 | 国网江苏省电力有限公司电力科学研究院 | Signal separation real-time processing method and system for two-in-one sensor |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101403777B (en) | Resistive current tester for great current zinc oxide lightning arrester | |
| CN204882843U (en) | Transformer remanence detects and demagnetization device | |
| CN103207379B (en) | Method and device for measuring direct current magnetic bias error characteristics of current transformer | |
| CN105093140A (en) | Transformer remanence detection and demagnetization method and device | |
| CN204536528U (en) | A kind of charging pile direct-current electric energy meter calibration device | |
| CN102269787A (en) | Detection method of harmonic characteristic of electronic voltage transformer and detection device thereof | |
| CN104569902A (en) | Digital type electric energy meter power consumption measuring device and method | |
| CN101441231A (en) | Harmonic electric energy metering error analytical apparatus | |
| CN105242228A (en) | Current blanking method and device of transformer iron core grounding current online monitoring equipment | |
| CN205049724U (en) | Sky device is put to electric current of transformer core earth current on -line monitoring equipment | |
| CN106405470A (en) | Overall detection method and apparatus for harmonic accuracy of electronic current transformer | |
| CN106291092A (en) | The anti-outside Constant charge soil interference method of a kind of intelligent electric meter | |
| CN105203981A (en) | Field inspection device and method of grounding current on-line monitoring equipment for transformer core | |
| CN106066437A (en) | A kind of on-line monitoring device of metallic oxide arrester and monitoring method thereof | |
| CN106018998A (en) | Lightning arrester test method and lightning arrester test system | |
| CN101949979A (en) | Method for measuring resistance of ground wire of transformer | |
| CN104865549A (en) | Reliability evaluation method and system of electric energy metering device | |
| Abidullah et al. | Real-time power quality signals monitoring system | |
| CN114200381B (en) | Intelligent ammeter reliability detection system and method | |
| CN205049723U (en) | On --spot verifying attachment of transformer core earth current on -line monitoring equipment | |
| CN103558571A (en) | Calibration system of electronic transformer and merging unit | |
| CN201311463Y (en) | Resistive current tester of high-current zinc oxide arrester | |
| CN102385013B (en) | Method and device for detecting harmonic characteristic of electronic current transformer | |
| CN106443537A (en) | Calibration method for online capacitive equipment insulation parameter monitoring device and calibration equipment | |
| CN203025253U (en) | Capacitive equipment dielectric loss energized testing device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20160224 Effective date of abandoning: 20180105 |