CN203849352U - Apparatus for diagnosing fault of damping loop of capacitor voltage transformer - Google Patents
Apparatus for diagnosing fault of damping loop of capacitor voltage transformer Download PDFInfo
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- CN203849352U CN203849352U CN201420104849.9U CN201420104849U CN203849352U CN 203849352 U CN203849352 U CN 203849352U CN 201420104849 U CN201420104849 U CN 201420104849U CN 203849352 U CN203849352 U CN 203849352U
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- transformer
- damping circuit
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- voltage
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Abstract
The utility model provides an apparatus for diagnosing a fault of a damping loop of a capacitor voltage transformer. The apparatus comprises a current transformer, a voltage transformer, a processor, a display terminal, an auto transformer and an isolation transformer. The processor comprises a power supply input end connected with an external alternating current power supply, a data interface, a communication terminal and a power supply output end. The power supply output end is connected with an input end of the auto transformer. An output end of the auto transformer is connected with a primary side of the isolation transformer. A secondary side of the isolation transformer is connected with a leading-out terminal containing the damping loop of the capacitor voltage transformer. After the current transformer is connected to the output end of the auto transformer and the voltage transformer is connected to the secondary side of the isolation transformer, the current transformer and the voltage transformer are jointly connected to the data interface. The display terminal is connected with the communication terminal. The processor also comprises a control chip used for processing data and connected to the data interface and the communication terminal. The apparatus is simple and reasonable in structure, convenient in platform construction and high in stability, and can timely detect the fault of the damping loop of the capacitor voltage transformer.
Description
Technical field
The utility model relates to the technical field of capacitance type potential transformer, particularly relates to a kind of capacitance type potential transformer damping circuit trouble-shooter.
Background technology
Capacitance type potential transformer is comprised of capacitive divider and electromagnetic unit two parts, and damping circuit belongs to a part for electromagnetic unit, can suppress lasting ferroresonance.In daily maintenence pilot project, damping circuit fault causes capacitance type potential transformer quantity out of service to account for the more than 60% of total failare number.Owing to cannot accurately carrying out the work of damping circuit state analysis, cause the frequent appearance heating in service of capacitance type potential transformer electromagnet portion, secondary voltage abnormal, the fault such as low-tension fuse explosion even, extremely unfavorable to the stable operation of the safety of equipment, electrical network, have a strong impact on the safe and stable operation of system, reduced rack availability and corporate economy's benefit.
At present, part high-potting personnel progressively start in conjunction with damping circuit principle of work, utilize bringing-out, the leading-out terminal that comprises capacitance type potential transformer damping circuit, by configuration pressure regulator, voltage table, reometer and sky, the campaign equipment such as open, directly test damping current, voltage to analyze judgement unusual condition.Yet this detection mode is mainly the experience that relies on staff, carries out tentative diagnosis, builds testing equipment loaded down with trivial details, poor stability, and due to wave form distortion factor, cannot indicator current real effective.
Utility model content
The problem that the utility model exists for above-mentioned prior art, a kind of portable electric capacity formula voltage transformer (VT) damping circuit trouble-shooter applicable to each electric pressure has been proposed, the fault that can automatic diagnosis has damping circuit, and it is simple to build testing equipment, stability is high, ensures power system security production.
In order to solve the problems of the technologies described above, the technical solution of the utility model is as follows:
A kind of capacitance type potential transformer damping circuit trouble-shooter, comprise current transformer, voltage transformer (VT), processor, display terminal, autotransformer and isolating transformer, described processor comprises the power input that connects external ac power source, data-interface, communication terminal and power output end, power output end is connected with the input end of described autotransformer, the output terminal of autotransformer connects the primary side of described isolating transformer, the secondary side of isolating transformer connects the leading-out terminal that comprises capacitance type potential transformer damping circuit, described current transformer is from the output terminal access of autotransformer, described voltage transformer (VT) is from the secondary side access of isolating transformer, jointly be connected to described data-interface, described display terminal is connected with communication terminal, described processor also comprise for the treatment of data and respectively with data-interface, the control chip that communication terminal connects.
The leading-out terminal that comprises capacitance type potential transformer damping circuit by utilization, build the two-port network containing damping circuit, utilize current transformer to gather this damping circuit current waveform, size, with the voltage of voltage measuring transformer damping circuit, and then utilize processor assessment judgement damping circuit health information and be presented on display terminal.The utility model simple operation, builds testing equipment simple, and stability is high, can detect effective value, peak value and the corresponding squiggle of damping circuit electric current and voltage, and then diagnose out damping circuit fault.
Described processor also comprises protection end, for the voltage in described data-interface collection or electric current automatic discharging when excessive, stop gathering and by described data-interface and equipment under test ground connection.
Described communication terminal is for adopting the communication terminal of Bluetooth technology.Can avoid setting up physical connection with external power source, thus being perfectly safe of this fault diagnosis system and testing crew.
The utility model has the advantages that: the first, simple operation, builds testing equipment simple, and stability is high, can detect effective value, peak value and the corresponding squiggle of damping circuit electric current and voltage; The second, voltage, electric current stable output, measuring accuracy is high, and the 3rd, superpotential, overcurrent protection are provided, reduced the risk of personnel and equipment in damping circuit failure diagnostic process, improved stability; The 4th, multiple communication modes is provided, can adopt Bluetooth technology to carry out wireless connections, it is more intelligent convenient to operate, and has reduced effectively the risk at damping circuit fault diagnosis scene, has improved the convenience of practical operation.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model;
Fig. 2 is the electrical schematic diagram of capacitance type potential transformer;
Description of reference numerals: 1, processor, 2, autotransformer, 3, display terminal, 4, current transformer, 5, voltage transformer (VT), 6, isolating transformer.
Embodiment
For above-mentioned purpose of the present utility model, feature and advantage can be become apparent more, below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
As shown in Figure 1, a kind of capacitance type potential transformer damping circuit trouble-shooter, comprise current transformer 4, voltage transformer (VT) 5, processor 1, display terminal 3, autotransformer 2 and isolating transformer 6, described processor 1 comprises the power input that connects external ac power source, data-interface, communication terminal and power output end, power output end is connected with the input end of described autotransformer 2, the output terminal of autotransformer connects the primary side of described isolating transformer 6, the secondary side of isolating transformer 6 connects the leading-out terminal that comprises capacitance type potential transformer damping circuit, described current transformer 4 is from the output terminal access of autotransformer 2, described voltage transformer (VT) 5 is from the secondary side access of isolating transformer 6, jointly be connected to described data-interface, described display terminal 3 is connected with communication terminal, described processor 1 also comprise for the treatment of data and respectively with data-interface, the control chip that communication terminal connects.
As Fig. 2, capacitance type potential transformer (Capacitor Voltage Transformers), is called for short CVT, and its damping circuit is generally comprised of inductance, electric capacity and resistance, is distributed between da-dn tap region.In power frequency situation, because of the capacitor C x in damping circuit and inductance L x generation parallel resonance, damping circuit is high-impedance state, is equivalent to open circuit, and the electric current of the resistance R of flowing through z is minimum, and heating power is also very low; In CVT once produce subharmonic, inductance L x and capacitor C x off resonance under subfrequency, impedance reduces, and on damping resistance Rz, with regard to having larger subharmonic current, passes through, the energy of subharmonic will run out on resistance R z, and subharmonic also just thereby wither away.Visible, the test of damping circuit is exactly mainly to measure damping current.
The utility model is being analyzed on the basis of each electric pressure secondary terminals outer taps design of all types of damping circuit principle of work and contrast, consider various field working conditions, appropriate design wire examination method, a kind of portable electric capacity formula voltage transformer (VT) damping circuit trouble-shooter applicable to each electric pressure has been proposed, to improve in electric system for capacitance type potential transformer damping circuit fault diagnosis means, can make testing crew accurately test, judge capacitance type potential transformer damping circuit state, with support equipment safe and stable operation.
Pass through the present embodiment, the leading-out terminal that utilization comprises capacitance type potential transformer damping circuit, build the two-port network containing damping circuit, and then utilize current transformer 4, voltage transformer (VT) 5 to gather this damping circuit current waveform and size, calculate the current value under rated voltage, and utilize processor 1 assessment judgement damping circuit health information and be presented on display terminal 3; Simple operation, platform stable, can accurately measure effective value, peak value and the corresponding squiggle of equipment under test damping circuit electric current and voltage, according to the health status of detected waveform situation judgement damping circuit, failure judgement reason etc.
Autotransformer 2, for the autotransformer that input end adopts zero crossing triggering mode to start, can be avoided heavy current impact, prevents instrument damage; Processor 1 also comprises protection end; for the voltage that gathers at described data-interface or electric current when excessive; utilize external ground leading-out terminal; automatic discharging, stop gathering and by described data-interface and equipment under test ground connection; can avoid curtage too high and accidents caused, improve the stability of this fault diagnosis system.
In the utility model, automatic coupling voltage regulator 2 is connected with isolating transformer 6, has formed the power cell of power invariability in a transmission, the importation that automatic coupling voltage regulator 2 is power cell, the output that isolating transformer 6 is power cell, does not have power attenuation from importation to output.During practical application, the protection end of processor 1 is equipped with overvoltage, overcurrent protection function, autotransformer 2 adopts electrodynamic type automatic coupling voltage regulator, under its electronic voltage regulating mode, possess two Voltage-output patterns of 100V and 150V available, while wherein selecting 100V range, the in the situation that of overvoltage protection, can not continue again to heighten voltage; Output adopts 1:1 isolating transformer to isolate output, and output voltage can be controlled by the machine or long-range extension set; Electric current surpasses 5A or voltage surpasses in the situation of 150V; this capacitance type potential transformer damping circuit trouble-shooter utilizes external cabling leading-out terminal; ground connection when test overload, automatic discharging also exits test procedure, thereby effectively protects instrument and equipment under test.
Current transformer 4 selects high-precision sensing instrument to carry out data sampling, and increases electromagnetic interference shield measure, can remove interference, improves measuring accuracy, makes voltage, electric current stable output, and measuring accuracy can reach 1%, and frequency test precision can reach 0.2%.
The control chip of processor 1 comprises: data input pin, for inputting diagnostic data; Digital-to-analog conversion end, for being converted to digital signal by the simulating signal of described diagnostic data; Data processing end, for the treatment of described diagnostic data; Data output end, for exporting the result of described diagnostic data.Data input pin is connected with the data-interface of processor 1, be connected with external input device simultaneously, for manually initiatively inputting data, data-switching end adopts 12 high-speed AD to carry out digital-to-analog conversion, data output end is connected with the communication terminal of processor 1, because this two-port network only has capacitance resistance inductance, and the reference value providing by producer, can calculate the electric current theoretical value of this two-port network under rated voltage, then compare with actual detected value; Meanwhile, resistance can directly be measured, and can judge Resistance Fault or reactance fault; Further, can analyze each Harmonic Parameters of current waveform, comprehensive judgement report is provided; Export the result of diagnostic data to communication terminal 2 in the lump afterwards.
Display terminal 3 can show voltage, current waveform and effective value thereof, each Harmonic Parameters of electric current and assessment result in real time with screen.Communication terminal adopts Bluetooth technology and display terminal 3 to set up communication, can avoid setting up physical connection with external power source, thus being perfectly safe of this fault diagnosis system and testing crew.
Described current transformer 4, voltage transformer (VT) 5, processor 1, display terminal 3, autotransformer 2 and isolating transformer 6 adopt integrated sealing combination assembly technology to make.Under the environment of high pressure, UHV (ultra-high voltage), test apparatus is built complexity, disturb more, stability is not strong, also there is certain danger, capacitance type potential transformer damping circuit trouble-shooter of the present utility model, design after internal component layout, adopt integrated sealing combination assembly technology to make, only need the secondary side of isolating transformer 6 to be connected and can to check with the leading-out terminal that comprises capacitance type potential transformer damping circuit, its integrated degree is high, and convenience is strong, guarantees the stability of this fault diagnosis system.
When practical application, first by adjusting equipment under test secondary leading-out terminal connected mode, form the two-port network containing damping circuit, build damping circuit routine tests path, then the data input pin at processor 1 control chip pre-enters equipment under test producer controlling value and Harmonic Parameters, again two-port network input point is connected in to the output port of isolating transformer 6, at control chip, select suitable voltage range, confirm the input situation of protected location, then equipment under test is pressurizeed, by high-precision current mutual inductance instrument, test the electric current in this two-port network, test number is through 12 ultra high speed A/D conversion, in real time at display terminal 3 output voltage size and waveforms, frequency values, damping circuit size of current and waveform, after output voltage stabilization, automatically carry out each Harmonic Parameters analysis of damping circuit electric current, and carry out analysis and evaluation, show assessment result, complete test.
The utility model embodiment simple operation, can detect effective value, peak value and the corresponding squiggle of damping circuit electric current and voltage; Voltage, electric current stable output, measuring accuracy can reach 1%, and frequency test precision can reach 0.2%, and can show the waveform of voltage and current and carry out frequency analysis; Voltage classification output, can select output voltage and as required by electronic control; Superpotential, overcurrent protection are provided, have reduced the risk of personnel and equipment in damping circuit failure diagnostic process, improved stability; Multiple communication modes is provided, can adopts Bluetooth technology to carry out wireless connections, it is more intelligent convenient to operate; Each is module-integrated integrated, and integrated degree is high, and stability is strong, has reduced effectively the risk at damping circuit fault diagnosis scene, has improved the convenience of practical operation.
The above; it is only preferably embodiment of the utility model; but protection domain of the present utility model is not limited to this; anyly be familiar with those skilled in the art in the technical scope that the utility model discloses; the variation that can expect easily or replacement, within all should being encompassed in protection domain of the present utility model.
Claims (3)
1. a capacitance type potential transformer damping circuit trouble-shooter, it is characterized in that, comprise current transformer, voltage transformer (VT), processor, display terminal, autotransformer and isolating transformer, described processor comprises the power input that connects external ac power source, data-interface, communication terminal and power output end, power output end is connected with the input end of described autotransformer, the output terminal of autotransformer connects the primary side of described isolating transformer, the secondary side of isolating transformer connects the leading-out terminal that comprises capacitance type potential transformer damping circuit, described current transformer is from the output terminal access of autotransformer, described voltage transformer (VT) is from the secondary side access of isolating transformer, jointly be connected to described data-interface, described display terminal is connected with communication terminal, described processor also comprise for the treatment of data and respectively with data-interface, the control chip that communication terminal connects.
2. capacitance type potential transformer damping circuit trouble-shooter according to claim 1; it is characterized in that, described processor also comprises for the voltage in described data-interface collection or electric current automatic discharging when excessive, stops gathering and by the protection end of described data-interface and equipment under test ground connection.
3. capacitance type potential transformer damping circuit trouble-shooter according to claim 1, is characterized in that, described communication terminal is for adopting the communication terminal of Bluetooth technology.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420104849.9U CN203849352U (en) | 2014-03-07 | 2014-03-07 | Apparatus for diagnosing fault of damping loop of capacitor voltage transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420104849.9U CN203849352U (en) | 2014-03-07 | 2014-03-07 | Apparatus for diagnosing fault of damping loop of capacitor voltage transformer |
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| Publication Number | Publication Date |
|---|---|
| CN203849352U true CN203849352U (en) | 2014-09-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420104849.9U Expired - Fee Related CN203849352U (en) | 2014-03-07 | 2014-03-07 | Apparatus for diagnosing fault of damping loop of capacitor voltage transformer |
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| CN (1) | CN203849352U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106707080A (en) * | 2016-10-31 | 2017-05-24 | 中国南方电网有限责任公司超高压输电公司南宁局 | Series compensation damping loop protection method based on envelope line |
| CN114089018A (en) * | 2021-11-05 | 2022-02-25 | 国网青海省电力公司检修公司 | Method for testing faults of electromagnetic units of capacitor voltage transformer |
-
2014
- 2014-03-07 CN CN201420104849.9U patent/CN203849352U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106707080A (en) * | 2016-10-31 | 2017-05-24 | 中国南方电网有限责任公司超高压输电公司南宁局 | Series compensation damping loop protection method based on envelope line |
| CN106707080B (en) * | 2016-10-31 | 2019-06-11 | 中国南方电网有限责任公司超高压输电公司南宁局 | A kind of string benefit damping circuit guard method based on envelope |
| CN114089018A (en) * | 2021-11-05 | 2022-02-25 | 国网青海省电力公司检修公司 | Method for testing faults of electromagnetic units of capacitor voltage transformer |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140924 Termination date: 20150307 |
|
| EXPY | Termination of patent right or utility model |