CN104155626A - System of detecting ground potential rising-resisting ability of voltage transformer - Google Patents
System of detecting ground potential rising-resisting ability of voltage transformer Download PDFInfo
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Abstract
The invention provides a system of detecting the ground potential rising-resisting ability of a voltage transformer. The system comprises a standard lightning impulse wave generator, an adjustable inductor L, an adjustable resistor R, and a measuring device, wherein the standard lightning impulse wave generator is provided with an input end and an output end connected with the output end of a power frequency test power supply and the input end of a to-be-detected electronic voltage transformer; the measuring device is provided with two input ends respectively connected with the output end and a grounding terminal of the to-be-detected electronic voltage transformer; two ends of the adjustable inductor L are respectively connected with the grounding terminal of the to-be-detected electronic voltage transformer and the adjustable resistor R; the other end of the adjustable resistor is connected with a grounding net; and the measuring device comprises a high-voltage probe and a waveform recorder. According to the system, the operation is convenient, defects that a simulation method cannot fully simulate the actual situations, functions are equivalent as a method of constructing a GIS test platform and the cost is low, and quality control on products can be realized before screening operation assessment.
Description
Technical field:
The present invention relates to a kind of detection system, specifically relate to the system that a kind of detected electrons formula voltage transformer (VT) is resisted transient state earth potential rising invasive ability.
Background technology:
As the electric power mutual-inductor of the important converting equipment of a class, its enormous amount and widely distributed, is mainly used in providing metrical information for electrical secondary systems such as metering, control and relay protections.
Electronic mutual inductor in electric power mutual-inductor have insulation system simple, without magnetic saturation, the advantage such as measuring accuracy is high, transient response scope is large, volume is little, output signal digitizing; it not only can reduce the integrated cost of transformer station; the more important thing is Reliability of Microprocessor and the precision that can significantly improve the interior protective device of system and measuring apparatus, therefore in electrical network, widely applied in recent years.
The overwhelming majority in the electronic type voltage transformer (Electronic Voltage Transformer, EVT) having put into operation is at present the capacitive voltage division electronic voltage transformer based on capacitive divider principle.According to the difference of use occasion, capacitance partial pressure type EVT can be divided into again the deposited large class of formula two in independent support type and GIS (Gas Insulated Substation).In GIS, apply formula EVT for GIS transformer station, generally adopt gas-insulated, mainly by capacitive divider, cylindrical shell, disc insulator, signal picker and merge cells etc., formed.While carrying out the switchgear operation such as disconnector, isolating switch as GIS, very easily produce oscillation frequency up to dozens or even hundreds of million very fast transient overvoltage (Very Fast Transient Overvoltage, VFTO), thereby often cause transient state earth potential rising (the Transient Grounding Potential Rise in GIS transformer station, TGPR) phenomenon, causes heavy losses.TGPR can exert an influence to applying formula EVT in GIS, threatens its insulation, disturbs and even damages signal picker and power supply thereof.Therefore, in GIS, apply in the design process of formula EVT product, need to study the impact of TGPR.
Adopt at present following three kinds of method research TGPR on applying the impact of formula EVT product in GIS
(1) simulation study.Utilize the power system simulation softwares such as EMTP, EMTDC/PSCAD, NETOMAC to set up the model of GIS and EVT, by simulation calculation, obtain voltage, the current parameters on EVT element.Although this method is simple and easy to do, exist institute's established model deficiency of simulating actual conditions completely, and simulation study cannot substitute products test, therefore need to provide and in a kind of GIS of detection, apply the test method that formula EVT resists TGPR ability;
(2) hanging net operation of EVT product examination.Although this method can make EVT operate in actual electric network, in view of the strict demand of operation of power networks to safe reliability, may make linked network EVT there is no the service condition that experience is the harshest at all, also just cannot verify the correctness of product design comprehensively.In addition, this method cannot play and before product export, carry out the effect that quality is checked on;
(3) build and comprise isolating switch, disconnector at interior GIS test platform, utilize the operation of switchgear to produce TGPR, to applying formula EVT product in GIS, examine, this method meets the demand that EVT product is resisted TGPR ability that detects technically.But the practical experience of operation of power networks shows, the very fast transient overvoltage that causes TGPR is present among electrical network more than 420kV, this just means if simulate the TGPR consistent with operation of power networks situation completely, the electric pressure of GIS test platform is inevitable higher than 420kV, involves great expense and the manufacture level of platform device is had relatively high expectations.
Based on above-mentioned background, a kind of good economy performance need to be provided, avoid building GIS test platform and the technical scheme being convenient to realize comes detected electrons formula voltage transformer (VT) to resist transient state earth potential climbing capacity.
Summary of the invention:
In order to overcome existing above-mentioned defect in prior art, the invention provides a kind of system that voltage transformer (VT) is resisted earth potential climbing capacity that detects.
Technical scheme provided by the invention is: a kind ofly detect the system that voltage transformer (VT) is resisted earth potential climbing capacity, described system comprises standard lightning impulse generator, controllable impedance L, adjustable resistor R, measurement mechanism;
Its improvements are: described standard lightning impulse generator is provided with the input and output side being connected with the output terminal of industrial frequency experiment power supply and the input end of electronic type voltage transformer to be detected respectively, described measurement mechanism is provided with respectively two input ends with the output and ground sub-connection of described electronic type voltage transformer to be detected, described controllable impedance L two ends connect respectively ground terminal and the described adjustable resistor of described electronic type voltage transformer to be detected, and the other end of described adjustable resistor is connected with grounded screen; Described measurement mechanism comprises high-voltage probe and wave tracer.
Preferably, the superpotential that the output of described standard lightning impulse generator and very fast transient overvoltage have similar rise time and an amplitude reaches the input end of described electronic type voltage transformer to be detected.
Preferably, an input end of described measurement mechanism receives the voltage signal of the output terminal output of described electronic type voltage transformer to be detected, described voltage signal be transient state earth potential while raising described in the output voltage of electronic type voltage transformer to be detected.
Further, another input end of described measurement mechanism receives the voltage signal of the ground terminal output of described electronic type voltage transformer to be detected, described voltage signal be transient state earth potential while raising described in the current potential of electronic type voltage transformer ground terminal to be detected.
Preferably, the ground terminal of the described electronic type voltage transformer to be detected of described controllable impedance L simulation and the lead-in inductance between grounding net of transformer substation.
Preferably, described adjustable resistor R is by the stake resistance of the different electric pressure of the change modeling transformer station of resistance.
Preferably, described high-voltage probe comprises the second high-voltage probe that the first high-voltage probe that input end is connected with described electronic type voltage transformer output terminal to be detected is connected with described electronic type voltage transformer ground terminal to be detected with input end, and another input end of described the first high-voltage probe is connected with grounded screen respectively with another input end of described the second high-voltage probe.
Further, described the first high-voltage probe and described the second high-voltage probe proportionally dwindle the output signal of the output signal of described electronic type voltage transformer output terminal to be detected and described electronic type voltage transformer ground terminal to be detected respectively, make the amplitude of described output signal within the input range scope of described wave tracer.
Further, described wave tracer is provided with two input ends that are connected with the output terminal of described the first high-voltage probe and the output terminal of described the second high-voltage probe respectively; Described wave tracer receives the two paths of signals of described the first high-voltage probe and described the second high-voltage probe input, and the signal receiving is shown, stored and analyzes.
Compare with immediate technical scheme, the present invention has following marked improvement:
1, electronic type voltage transformer provided by the invention is resisted earth potential climbing capacity detection system, has overcome the emulation mode shortcoming of simulating actual conditions completely, can before hanging net operation examination, to product, carry out quality and check on.
2, the present invention adopts standard lightning impulse generator to produce very fast transient overvoltage to GIS inside similar superpotential on the waveform characters such as rise time and amplitude, comprising with structure the method that isolating switch, disconnector carry out correlation test at interior GIS test platform compares, the present invention has saved cost of investment, test period is short, workable.
3, the testing result that measurement mechanism records can be used as the reference frame of applying formula EVT product design in GIS, perfect mentality of designing and the step of electronic type voltage transformer.
Accompanying drawing explanation:
Fig. 1 is the test connection figure of original employing GIS test platform;
Fig. 2 is the installation dimension figure of original employing GIS test platform;
The test principle figure that Fig. 3 provides for invention;
Fig. 4 is the circuit theory diagrams of 4 grades of impulse voltage generators.
Embodiment:
In order to understand better the present invention, below in conjunction with Figure of description and example, content of the present invention is described further.
Fig. 1 and Fig. 2 are test connection figure and the installation dimension figure of the GIS test platform of examination electronic mutual inductor, and this test platform cost is high, manufacture difficulty is large.
The schematic diagram of technical scheme provided by the invention is as shown in Figure 3: detection system is comprised of standard lightning impulse generator, controllable impedance, adjustable resistor and measurement mechanism.
Standard lightning impulse generator adopts multistage impulse voltage generator stack to form, its input side joint industrial frequency experiment power supply, the input of outgoing side reception detected electrons formula voltage transformer (VT), for generation of 500kV and above and very fast transient overvoltage GIS inside similar input voltage on the waveform characters such as rise time and amplitude.
Fig. 4 is the elementary diagram of 4 grades of impulse voltage generators, wherein: T is power supply high voltage transformer; D is rectification high voltage silicon rectifier stack; R is protective resistance; R is charging resistor; C is the main capacitance of every grade; C
sstray capacitance over the ground for every grade of respective point; g
1for ignition pill gap; g
2～g
4for intermediate gap; g
0for batching sphere gap; r
fwavefront resistance for every grade; r
tdischarge resistance for every grade; C
tfor load capacity.Different according to test demand, thus above-mentioned 4 grades of impulse voltage generators can be generalized to 4 grades of above surge voltages that produce different amplitudes.
The outgoing side of electronic type voltage transformer input side joint standard lightning impulse generator to be detected, the input side of its outgoing side access measurement mechanism.
Controllable impedance is for simulating the ground terminal of electronic type voltage transformer to be detected and the lead-in inductance between grounding net of transformer substation, its one end is connected with the ground terminal of electronic type voltage transformer to be detected and output signal is reached to the input side of measurement mechanism, and the other end is connected with adjustable resistor.
Adjustable resistor is used for simulating the stake resistance of each electric pressure transformer station by the variation of resistance, its one end is connected with controllable impedance, and the other end is connected with grounded screen.
Measurement mechanism receives the output signal of electronic type voltage transformer to be detected, this output signal has reflected the output situation of the electronic type voltage transformer to be detected when transient state earth potential raises generation, can be used for detecting design parameter and the insulation margin of assessment electronic type voltage transformer.
Measurement mechanism receives the output signal of controllable impedance and electronic type voltage transformer ground terminal to be detected connection, this output signal has reflected the current potential size of the electronic type voltage transformer ground terminal to be detected when transient state earth potential raises generation, can be used as the reference frame of electronic type voltage transformer product design.
Measurement mechanism is mainly comprised of high-voltage probe and wave tracer two parts, for the overvoltage signal that prevents from measuring is by the parts damages in measurement mechanism, the voltage of high-voltage probe tolerance parameter is higher than the maximum possible value of electronic type voltage transformer lead-out terminal to be detected and ground terminal two point voltages.The Measurement bandwidth of high-voltage probe is greater than the bandwidth of electronic type voltage transformer lead-out terminal to be detected and ground terminal two point voltages.
The function of high-voltage probe is that the output signal of electronic type voltage transformer to be detected and the output signal of controllable impedance and electronic type voltage transformer ground terminal to be detected connection that are input to measurement mechanism are dwindled by a certain percentage to decay, made its size within the input range scope of wave tracer; Waveform recording device is partly mainly used in showing, stores, analyzes input signal wherein.
When detecting test, first, adjustment criteria lightning impulse wave producer, makes it simulate very fast transient overvoltage to GIS inside similar superpotential on the waveform characters such as rise time and amplitude, as the input voltage of electronic type voltage transformer to be detected;
At electronic type voltage transformer to be detected, obtain after input voltage, measurement mechanism records the output signal of electronic type voltage transformer to be detected and the output signal of controllable impedance and electronic type voltage transformer ground terminal to be detected connection.According to actual needs, measurement mechanism can carry out waveform demonstration, storage and analysis to this two-way output signal.
These are only embodiments of the invention, be not limited to the present invention, within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., within the claim scope of the present invention all awaiting the reply in application.
Claims (9)
1. detect voltage transformer (VT) and resist a system for earth potential climbing capacity, described system comprises standard lightning impulse generator, controllable impedance L, adjustable resistor R, measurement mechanism;
It is characterized in that: described standard lightning impulse generator is provided with the input and output side being connected with the output terminal of industrial frequency experiment power supply and the input end of electronic type voltage transformer to be detected respectively, described measurement mechanism is provided with respectively two input ends with the output and ground sub-connection of described electronic type voltage transformer to be detected, described controllable impedance L two ends connect respectively ground terminal and the described adjustable resistor of described electronic type voltage transformer to be detected, and the other end of described adjustable resistor is connected with grounded screen; Described measurement mechanism comprises high-voltage probe and wave tracer.
2. a kind of system that voltage transformer (VT) is resisted earth potential climbing capacity that detects as claimed in claim 1, is characterized in that:
The superpotential that the output of described standard lightning impulse generator and very fast transient overvoltage have similar rise time and an amplitude reaches the input end of described electronic type voltage transformer to be detected.
3. a kind of system that voltage transformer (VT) is resisted earth potential climbing capacity that detects as claimed in claim 1, is characterized in that:
One input end of described measurement mechanism receives the voltage signal of the output terminal output of described electronic type voltage transformer to be detected, described voltage signal be transient state earth potential while raising described in the output voltage of electronic type voltage transformer to be detected.
4. a kind of system that voltage transformer (VT) is resisted earth potential climbing capacity that detects as claimed in claim 3, is characterized in that:
Another input end of described measurement mechanism receives the voltage signal of the ground terminal output of described electronic type voltage transformer to be detected, described voltage signal be transient state earth potential while raising described in the current potential of electronic type voltage transformer ground terminal to be detected.
5. a kind of system that voltage transformer (VT) is resisted earth potential climbing capacity that detects as claimed in claim 1, is characterized in that:
The ground terminal of the described electronic type voltage transformer to be detected of described controllable impedance L simulation and the lead-in inductance between grounding net of transformer substation.
6. a kind of system that voltage transformer (VT) is resisted earth potential climbing capacity that detects as claimed in claim 1, is characterized in that:
Described adjustable resistor R is by the stake resistance of the different electric pressure of the change modeling transformer station of resistance.
7. a kind of system that voltage transformer (VT) is resisted earth potential climbing capacity that detects as claimed in claim 1, is characterized in that:
Described high-voltage probe comprises the second high-voltage probe that the first high-voltage probe that input end is connected with described electronic type voltage transformer output terminal to be detected is connected with described electronic type voltage transformer ground terminal to be detected with input end, and another input end of described the first high-voltage probe is connected with grounded screen respectively with another input end of described the second high-voltage probe.
8. a kind of system that voltage transformer (VT) is resisted earth potential climbing capacity that detects as claimed in claim 7, is characterized in that:
Described the first high-voltage probe and described the second high-voltage probe proportionally dwindle the output signal of the output signal of described electronic type voltage transformer output terminal to be detected and described electronic type voltage transformer ground terminal to be detected respectively, make the amplitude of described output signal within the input range scope of described wave tracer.
9. a kind of system that voltage transformer (VT) is resisted earth potential climbing capacity that detects as claimed in claim 8, is characterized in that:
Described wave tracer is provided with two input ends that are connected with the output terminal of described the first high-voltage probe and the output terminal of described the second high-voltage probe respectively; Described wave tracer receives the two paths of signals of described the first high-voltage probe and described the second high-voltage probe input, and the signal receiving is shown, stored and analyzes.
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| CN201410404021.XA CN104155626B (en) | 2014-08-15 | 2014-08-15 | The system that ground potential climbing capacity resisted by a kind of detection voltage transformer |
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| CN201410404021.XA CN104155626B (en) | 2014-08-15 | 2014-08-15 | The system that ground potential climbing capacity resisted by a kind of detection voltage transformer |
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| CN104155626B CN104155626B (en) | 2017-03-08 |
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| CN105699928A (en) * | 2014-11-24 | 2016-06-22 | 国家电网公司 | Adjacent-phase electrified body error influence test apparatus and test method thereof |
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| CN113267687A (en) * | 2021-03-25 | 2021-08-17 | 珠海隆光电力工程有限公司 | Method for monitoring potential rise of grounding grid of power plant and transformer substation on line |
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| CN106451312B (en) * | 2015-08-06 | 2018-11-16 | 中国电力科学研究院 | A kind of raised suppressing method of 500kV cable GIS terminal transient state ground potential |
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