CN105652229A - Controllable partial discharge pulse signal generator - Google Patents
Controllable partial discharge pulse signal generator Download PDFInfo
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- CN105652229A CN105652229A CN201610228049.1A CN201610228049A CN105652229A CN 105652229 A CN105652229 A CN 105652229A CN 201610228049 A CN201610228049 A CN 201610228049A CN 105652229 A CN105652229 A CN 105652229A
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- voltage waveform
- pulse signal
- signal
- discharge pulse
- local discharge
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/005—Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references
- G01R35/007—Standards or reference devices, e.g. voltage or resistance standards, "golden references"
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- General Physics & Mathematics (AREA)
- Testing Relating To Insulation (AREA)
Abstract
The embodiment of the invention discloses a controllable partial discharge pulse signal generator which comprises a programmable voltage waveform generator, a D/A signal converter, a digital switch module and a standard capacitor module, wherein one end of the programmable voltage waveform generator is connected with power frequency alternating current power, and the other end of the programmable voltage waveform generator is connected with the D/A signal converter, the digital switch module and the standard capacitor module in sequence. The programmable voltage waveform generator generates a programmable step voltage waveform signal; the D/A signal converter converts the generated digital signal into an analog signal; and the standard capacitor module converts the step voltage waveform signal into a controllable partial discharger pulse signal, and transmits the pulse signal to a load to be tested through a differentiating circuit. The controllable partial discharge pulse signal generator can generate a pulse signal with variable rising time, falling time, pulse width, polarity and number of pulses, and can continuously generate apparent charges of any sizes within 1 to 10,000 pC; and the implementation theory is simple, the accuracy is high, and the interference resistance is perfect.
Description
Technical field
The present invention relates to high pressure equipment technical field of measurement and test, particularly relate to a kind of controllable local discharge pulse signal generator.
Background technology
Power equipment shelf depreciation is to cause the main cause of insulation degradation, is also primary symptom and the form of expression of insulation degradation simultaneously. Therefore detect partial discharge quantity, it is possible to reflect the initial failure of equipment more delicately, provide foundation for effectively taking preventive measures, the safe and stable operation of power high voltage equipment is had great importance.
Check that partial discharge pulse's signal generator is shelf depreciation instrument and measurement of partial discharge provide pulse signal, it is provided that pulse signal whether convenient, true, directly affect accuracy and the reliability of measurement result.
Pulse signal generator in currently available technology can only produce the impulse waveform that form is fixing, and namely physical device is fixed, and the pulse of generation is fixed therewith, causes and needs different measuring circuits when the difference carrying out shelf depreciation is tested, increases testing cost. Meanwhile, existing pulse signal generator is typically only capable to the apparent charge discharge capacity in 10 excursions of output, and its output area is 1000pC, and accuracy is 5%-10%, it is impossible to meet the required precision of current high voltage electric appliance apparatus local discharge measurement.
Therefore, a kind of waveform is provided and amplitude is controlled and partial discharge pulse's signal generator of high accuracy pulse signal urgently occurs.
Summary of the invention
The embodiment of the present invention provides a kind of controllable local discharge pulse signal generator, to solve the waveform of pulse signal that in prior art, pulse signal generator produces, the problem that amplitude is uncontrollable and accuracy is low.
In order to solve above-mentioned technical problem, the embodiment of the invention discloses following technical scheme:
A kind of controllable local discharge pulse signal generator includes programmable voltage waveform generator, D/A signal adapter, digital switch module and standard capacitance module, one termination industrial-frequency alternating current of described programmable voltage waveform generator, the other end is sequentially connected with D/A signal adapter, digital switch module and standard capacitance module;
Described programmable voltage waveform generator is used for producing programmable step voltage waveform signal;
Described D/A signal adapter is for being converted to analogue signal by the digital signal that described programmable voltage waveform generator produces;
Described digital switch module is for selecting the break-make of described standard capacitance module;
Described standard capacitance module is for being converted into controllable local discharge instrument pulse signal by described step voltage waveform signal.
Preferably, described step voltage waveform signal includes the multiple waveforms voltage of frequency up to 80MHZ.
Preferably, described step voltage waveform signal includes rise time, fall time and variable duration, and amplitude is at the step voltage of-10V 10V.
Preferably, described D/A signal adapter is connected by BNC connector with described programmable voltage waveform generator.
Preferably, described digital switch module includes the switch of multiple parallel connection.
Preferably, described standard capacitance module includes the electric capacity of multiple parallel connection, and each electric capacity is all connected with a switch.
Preferably, described standard capacitance module is made up of the Capacitance parallel connection of capacitance respectively 1PF, 2PF, 5PF, 100PF, 200PF, 500PF, 1000PF.
Preferably, described standard capacitance module is for constituting peaker with load in series to be tested.
From above technical scheme, a kind of controllable local discharge pulse signal generator that the embodiment of the present invention provides can generate the pulse signal that rise time, fall time, pulsewidth, polarity, pulse number are variable, and the apparent charge of any size in 1-10000pC can be continuously generated, realize principle simple, accuracy is high, and capacity of resisting disturbance is strong.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, the accompanying drawing used required in embodiment or description of the prior art will be briefly described below, apparently, for those of ordinary skills, under the premise not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
The structural representation of a kind of controllable local discharge pulse signal generator that Fig. 1 provides for the embodiment of the present invention;
Symbol table in Fig. 1 is shown as: S-programmable voltage waveform generator, T-D/A signal adapter, D-digital switch module, C-standard capacitance module.
Detailed description of the invention
In order to make those skilled in the art be more fully understood that the technical scheme in the present invention, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only a part of embodiment of the present invention, rather than whole embodiments. Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under not making creative work premise, all should belong to the scope of protection of the invention.
For solving the pulse signal waveform that pulse signal generator of the prior art produces, the problem that amplitude is uncontrollable and accuracy is low, a kind of controllable local discharge pulse signal generator that the embodiment of the present invention provides, by programming the input parameter changing programmable voltage waveform generator S, parameter value according to input, programmable voltage waveform generator S exports corresponding step voltage waveform signal, through D/A signal adapter T, the step voltage waveform signal of standard capacitance module C pair converts, output amplitude, frequency, rise time, the controllable local discharge instrument pulse signal that fall time is variable. a kind of controllable local discharge pulse signal generator embodiment of the present invention provided below in conjunction with accompanying drawing is described in detail.
The structural representation of a kind of controllable local discharge pulse signal generator that Fig. 1 provides for the embodiment of the present invention, as it is shown in figure 1, a kind of controllable local discharge pulse signal generator that the embodiment of the present invention provides includes programmable voltage waveform generator S, D/A signal adapter T, digital switch module D and standard capacitance module C.
The one termination 220V industrial-frequency alternating current of programmable voltage waveform generator S, the other end is sequentially connected with D/A signal adapter T, digital switch module D and standard capacitance module C. Programmable voltage waveform generator S is used for producing programmable step voltage waveform signal, by programming the input parameter changing programmable voltage waveform generator S, exports the step voltage waveform signal corresponding with input parameter. Wherein, step voltage waveform signal can include frequency up to 80MHZ in embodiments of the present invention, amplitude is at the multiple waveforms voltage of-10V 10V, and can pass through to adjust the amplitude of input state modulator step voltage waveform signal, polarity, the repeatable frequency etc. of rise time, fall time and impulse train. Certainly; the above-mentioned adjustment mode to step voltage waveform signal is only the embodiment of the present invention one exemplary illustration; other parameter of step voltage waveform signal can be adjusted by those skilled in the art according to actual needs, and it all should fall within protection scope of the present invention.
The input of the outfan of programmable voltage waveform generator S and D/A signal adapter T is electrically connected, and the digital signal that programmable voltage waveform generator S produces is converted to analogue signal by D/A signal adapter T. In one preferred embodiment of the present invention, D/A signal adapter T is connected by BNC connector with described programmable voltage waveform generator S.
The digital switch module D state by each digital switch of given digital judgement, and control the break-make of each digital switch. Digital switch module D is made up of the digital switch of multiple parallel connections; the quantity of digital switch can be carried out corresponding extension by those skilled in the art according to actual needs, for instance, 2,3,4,5 or 6 etc.; it should be understood that it all should fall within protection scope of the present invention.
Step voltage waveform signal is converted into controllable local discharge instrument pulse signal by standard capacitance module C. Standard capacitance module C includes multiple standard capacitance connected with parallel way; the quantity of standard capacitance can be carried out corresponding extension by those skilled in the art according to actual needs; such as; 2,3,4,5 or 6 etc.; it should be understood that it all should fall within protection scope of the present invention.
The quantity of digital switch keeps consistent with the quantity of standard capacitance, and each standard capacitance is connected with a digital switch in digital switch module D respectively, and namely each digital switch controls a standard capacitance. The quantity of such as digital switch and the quantity of standard capacitance respectively two time, digital switch module D includes the first digital switch, the second digital switch, and standard capacitance module C includes the first standard capacitance, the second standard capacitance. First digital switch and the first capacitances in series, the second digital switch and the second capacitances in series, two groups of digital switch are connected with parallel way with digital capacitance. First digital control first electric capacity break-make in circuit, the second digital control second electric capacity break-make in circuit.
In standard capacitance module C, the capacitance of multiple standard capacitances is different; in one preferred embodiment of the present invention; the capacitance of standard capacitance includes 1PF, 2PF, 5PF, 100PF, 200PF, 500PF, 1000PF; although it should be noted that; the capacitance of standard capacitance can be carried out corresponding adjustment by those skilled in the art according to actual needs, and it all should fall within protection scope of the present invention.The standard capacitance different by controlling digital switch switching, obtains different time constant, thus controlling the fall time of controllable local discharge instrument pulse.
The Voltage Series that standard capacitance module C and programmable voltage waveform generator S produces, according to Q=U �� C, can obtain continuous print apparent charge in 1-10000pC.
The outfan of standard capacitance module C constitutes peaker with load in series to be tested, by peaker by pulse signal transmission to load to be tested, carries out performance test.
Being more fully understood that the technical program for the ease of those skilled in the art, the use procedure below in conjunction with controllable local discharge pulse signal generator is further described.
When adopting a kind of controllable local discharge pulse signal generator output pulse signal that the embodiment of the present invention provides, the outfan of load to be tested with standard capacitance module C is connected, constitute peaker. Demand according to test process pulse signals, programmable voltage waveform generator S arranges the parameters of step voltage waveform, including pulse, dipulse, random pulses selection, and amplitude, time delay, rise time, fall time and step persistent period. According to the parameter value inputted, the step voltage waveform signal that programmable voltage waveform generator S output is corresponding. Through the conversion of D/A signal adapter T, the digital signal that programmable voltage waveform generator S produces is converted to analogue signal. The standard capacitance different by controlling digital switch switching, obtains different time constant, it is achieved the control to the fall time of controllable local discharge instrument pulse. Step voltage waveform signal is converted into controllable local discharge instrument pulse signal by standard capacitance module C, and by peaker by pulse signal transmission to load to be tested, carries out performance test.
The above is only the specific embodiment of the present invention, makes to skilled artisans appreciate that or realize the present invention. The multiple amendment of these embodiments be will be apparent to one skilled in the art, and generic principles defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments. Therefore, the present invention is not intended to be limited to the embodiments shown herein, and is to fit to the widest scope consistent with principles disclosed herein and features of novelty.
The above is only the specific embodiment of the present invention; it should be pointed out that, for those skilled in the art, under the premise without departing from the principles of the invention; can also making some improvements and modifications, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (8)
1. a controllable local discharge pulse signal generator, it is characterized in that, including programmable voltage waveform generator (S), D/A signal adapter (T), digital switch module (D) and standard capacitance module (C), one termination industrial-frequency alternating current of described programmable voltage waveform generator (S), the other end is sequentially connected with D/A signal adapter (T), digital switch module (D) and standard capacitance module (C);
Described programmable voltage waveform generator (S) is used for producing programmable step voltage waveform signal;
Described D/A signal adapter (T) is for being converted to analogue signal by the digital signal that described programmable voltage waveform generator (S) produces;
Described digital switch module (D) is used for selecting the break-make of described standard capacitance module (C);
Described standard capacitance module (C) is for being converted into controllable local discharge instrument pulse signal by described step voltage waveform signal.
2. controllable local discharge pulse signal generator according to claim 1, it is characterised in that described step voltage waveform signal includes the multiple waveforms voltage of frequency up to 80MHZ.
3. controllable local discharge pulse signal generator according to claim 1, it is characterised in that described step voltage waveform signal includes rise time, fall time and variable duration, and amplitude is at the step voltage of-10V 10V.
4. controllable local discharge pulse signal generator according to claim 1, it is characterised in that described D/A signal adapter (T) is connected by BNC connector with described programmable voltage waveform generator (S).
5. controllable local discharge pulse signal generator according to claim 1, it is characterised in that described digital switch module (D) includes the switch of multiple parallel connection.
6. controllable local discharge pulse signal generator according to claim 5, it is characterised in that described standard capacitance module (C) includes the electric capacity of multiple parallel connection, and each electric capacity is all connected with a switch.
7. controllable local discharge pulse signal generator according to claim 6, it is characterised in that described standard capacitance module (C) is made up of the Capacitance parallel connection of capacitance respectively 1PF, 2PF, 5PF, 100PF, 200PF, 500PF, 1000PF.
8. controllable local discharge pulse signal generator according to claim 1, it is characterised in that described standard capacitance module (C) is for constituting peaker with load in series to be tested.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610228049.1A CN105652229A (en) | 2016-04-13 | 2016-04-13 | Controllable partial discharge pulse signal generator |
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| CN201610228049.1A CN105652229A (en) | 2016-04-13 | 2016-04-13 | Controllable partial discharge pulse signal generator |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107167715A (en) * | 2017-06-30 | 2017-09-15 | 中国西电电气股份有限公司 | A kind of intelligent GIS partial discharges IED test loops and method |
| CN109342986A (en) * | 2018-12-14 | 2019-02-15 | 西安远测电力科技有限公司 | Standard discharge capacity signal generation apparatus for oscillation wave partial discharge test |
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| EP0974846A2 (en) * | 1998-07-18 | 2000-01-26 | Asea Brown Boveri AG | Method for detecting mounting or calibration faults of several signal isolating units in one or several partial discharge systems |
| CN103176160A (en) * | 2013-03-11 | 2013-06-26 | 广东电网公司电力科学研究院 | Local discharge simulation calibrating device |
| CN105044640A (en) * | 2015-06-27 | 2015-11-11 | 云南电网有限责任公司电力科学研究院 | Integrated controllable partial discharge instrument pulse signal generator |
| CN205539427U (en) * | 2016-04-13 | 2016-08-31 | 云南电网有限责任公司电力科学研究院 | Controllable partial discharge pulse generator |
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2016
- 2016-04-13 CN CN201610228049.1A patent/CN105652229A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0974846A2 (en) * | 1998-07-18 | 2000-01-26 | Asea Brown Boveri AG | Method for detecting mounting or calibration faults of several signal isolating units in one or several partial discharge systems |
| CN103176160A (en) * | 2013-03-11 | 2013-06-26 | 广东电网公司电力科学研究院 | Local discharge simulation calibrating device |
| CN105044640A (en) * | 2015-06-27 | 2015-11-11 | 云南电网有限责任公司电力科学研究院 | Integrated controllable partial discharge instrument pulse signal generator |
| CN205539427U (en) * | 2016-04-13 | 2016-08-31 | 云南电网有限责任公司电力科学研究院 | Controllable partial discharge pulse generator |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107167715A (en) * | 2017-06-30 | 2017-09-15 | 中国西电电气股份有限公司 | A kind of intelligent GIS partial discharges IED test loops and method |
| CN107167715B (en) * | 2017-06-30 | 2019-09-27 | 中国西电电气股份有限公司 | A kind of test loop partial discharge IED intelligence GIS and method |
| CN109342986A (en) * | 2018-12-14 | 2019-02-15 | 西安远测电力科技有限公司 | Standard discharge capacity signal generation apparatus for oscillation wave partial discharge test |
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Application publication date: 20160608 |