CN206321749U - A kind of shelf depreciation high frequency electric detection means - Google Patents
A kind of shelf depreciation high frequency electric detection means Download PDFInfo
- Publication number
- CN206321749U CN206321749U CN201621475217.9U CN201621475217U CN206321749U CN 206321749 U CN206321749 U CN 206321749U CN 201621475217 U CN201621475217 U CN 201621475217U CN 206321749 U CN206321749 U CN 206321749U
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- high frequency
- shelf depreciation
- detection means
- frequency electric
- test fixture
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Abstract
The utility model discloses a kind of shelf depreciation high frequency electric detection means, including waveform generator, oscillograph, noninductive resistance, injection electric capacity C0, test fixture and HF current transformer, HF current transformer is arranged in test fixture, the signal input part of the positive pole connecting test frock of waveform generator, injection electric capacity C0The signal output part of test fixture, injection electric capacity C are all connected with one end of noninductive resistance0The negative pole of waveform generator is all connected with the other end of noninductive resistance, noninductive resistance and HF current transformer are all connected with oscillograph.Shelf depreciation high frequency electric detection means shield effectiveness of the present utility model is high, and test result is stable, small by external environmental interference；Bandwidth of operation and field strength range are wide, and sensor transmissions impedance, system detectio frequency band, system sensitivity, system linear degree, system rejection to disturbance performance etc. can be demarcated.High frequency current tester measurement shelf depreciation is significant.
Description
Technical field
The utility model belongs to high voltage electric equipment Partial Discharge Detecting Technology field, is related to a kind of shelf depreciation high-frequency electrical
Flow detection device.
Background technology
Shelf depreciation is the non-through electric discharge phenomena caused due to local defect in dielectric, high-tension electricity equipment
The local defect (such as bubble, crack, suspended metal particles and electrode burrs) produced in manufacture and running can cause
Under certain running status partial discharges fault occurs for electrical equipment.Shelf depreciation is the electrical equipments such as transformer, GIS, cable
An important sign of insulation cracking in longtime running.If apparatus local discharge failure is undiscovered always and processing finally may be used
Electrical equipment can be caused to occur catastrophic failure.Partial Discharge Detection can effectively reflect the insulation fault of inside transformer,
Early detection especially to catastrophic discontinuityfailure is more much effective than the method such as dielectric loss measurement and chromatography and gas analysis.
In power equipment fault detection of local discharge and the research field of diagnostic techniques, typically by High Frequency Current Sensor
The research of related discharge feature is carried out, traditional demarcation to High Frequency Current Sensor is without true blanking method, measured electricity
The frequency range of stream is also extremely limited, especially in high band it is possible that the problem of distorted signals, the solution of these problems
There is very profound significance with diagnosis to power equipment fault detection of local discharge.
Accordingly, it would be desirable to which a kind of new shelf depreciation high frequency electric detection means is to solve the above problems.
Utility model content
Utility model purpose：In order to overcome problems of the prior art to be examined there is provided a kind of shelf depreciation high frequency electric
Survey device.
In order to solve the above technical problems, the technical side that shelf depreciation high frequency electric detection means of the present utility model is used
Case is：
A kind of shelf depreciation high frequency electric detection means, including waveform generator, oscillograph, noninductive resistance, injection
Electric capacity C0, test fixture and HF current transformer, the HF current transformer is arranged in the test fixture, the ripple
The positive pole of shape signal generator connects the signal input part of the test fixture, the injection electric capacity C0With one end of noninductive resistance
It is all connected with the signal output part of the test fixture, the injection electric capacity C0The waveform is all connected with the other end of noninductive resistance
The negative pole of signal generator, the noninductive resistance and HF current transformer are all connected with the oscillograph.
Further, the injection electric capacity C0For high-frequency ceramic electric capacity.Its capacity is 100pF ± 2%, works as waveform signal
When generator is steep-sided pulse generator, steep-sided pulse generator voltage pulse output, by injecting electric capacity C0Produced in test loop
Raw pulse current, the local discharge signal that simulation apparent charge amount is Q, and by tested instrument (containing HFCT) detection test loop
Pulse current.Wherein, HFCT is HF current transformer.
Further, also including self-inspection loop, the self-inspection loop is in parallel with the HF current transformer, it is described from
Examining loop includes controller, impulse generator and single-pole double-throw switch (SPDT), and the not moved end of the single-pole double-throw switch (SPDT) connects the control
Device processed, two moved ends of the single-pole double-throw switch (SPDT) connect impulse generator and waveform generator respectively.Single-pole double throw is opened
The switching of normal mode and Auto-Sensing Mode is realized by connecting waveform generator or impulse generator in pass.
Further, also including coalignment, the test fixture connects the coalignment.
Further, the matches impedances of the resistance of the noninductive resistance and coalignment.Calibration system matching is preferable.
Further, the waveform generator is connected by the signal input part of high frequency coaxial feeder line and test fixture
Connect, the coalignment is matched with high frequency coaxial feed line impedance.Calibration system matching is more preferable.
Further, the coalignment is noninductive resistance.Matching is easy, and effect is more preferable.Wherein, the resistance of noninductive resistance
Resist for 50 ohm.
Further, the waveform generator is sinusoidal signal generator or steep-sided pulse generator.
Beneficial effect：Shelf depreciation high frequency electric detection means shield effectiveness of the present utility model is high, and test result is stable,
It is small by external environmental interference；Bandwidth of operation and field strength range are wide, can be to sensor transmissions impedance, system detectio frequency band, system spirit
Sensitivity, system linear degree, system rejection to disturbance performance etc. are demarcated.Have to high frequency current tester measurement shelf depreciation great
Meaning.
Brief description of the drawings
Fig. 1 is structural representation of the present utility model；
Fig. 2 is the wiring schematic diagram of the current sensor transfer impedance of embodiment 2 experiment；
Fig. 3 is the wiring schematic diagram of the system detectio frequency detecting of embodiment 3 experiment；
Fig. 4 is the wiring schematic diagram of the system sensitivity of embodiment 4 detection experiment；
Fig. 5 is the wiring schematic diagram of the system linear degree of embodiment 5 detection experiment；
Fig. 6 is 3~60MHz frequency band range sensor transmissions testing impedance design sketch in embodiment 2；
Fig. 7 is 0~100MHz frequency band range sensor transmissions testing impedance design sketch in embodiment 2；
Wherein：UsFor sinusoidal signal generator, R0For noninductive resistance, M1For oscillograph, M0For by test examination instrument, UpFor steep-sided pulse
Generator, C0For injection electric capacity, RsFor load resistance.
Embodiment
Below in conjunction with the accompanying drawings and specific embodiment, the utility model is further elucidated, it should be understood that these embodiments are only used for
Illustrate the utility model rather than limit scope of the present utility model, after the utility model has been read, art technology
Modification of the personnel to the various equivalent form of values of the present utility model falls within the application appended claims limited range.
The utility model is further described below in conjunction with the accompanying drawings.
Embodiment 1
Refer to shown in Fig. 1, checked object is placed in test by shelf depreciation high frequency electric detecting system of the present utility model
Detected in frock, include the measure loop of waveform generator, noninductive resistance and injection electric capacity composition, and detected without electrification
Hinder the oscillograph of both end voltage value.The high-frequency electrical being connected in test fixture provided with output end through HF current transformer with oscillograph
Flow sensor.Wherein, waveform generator can generate random waveform.HFCT is High Frequency Current Sensor.
Wherein, when waveform generator is steep-sided pulse generator, steep-sided pulse generator voltage pulse output passes through note
Enter electric capacity C0Pulse current is produced in test loop, the local discharge signal that apparent charge amount is Q is simulated, and by being tested instrument
Pulse current in (containing HFCT) detection test loop.Inject electric capacity C0Preferably select high-frequency ceramic electric capacity, its capacity be 100pF ±
2%.
Waveform generator is connected to test fixture by coaxial cable, and then connect noninductive resistance or injection electric capacity C0
Return to the negative pole of signal source.
Test fixture is based on coaxial-symmetrical transmission line principle, and amplification coaxial transmission line crust and centreline space is away from and even
Connect coalignment.Coalignment is 50 ohm of noninductive resistances, and is matched with high frequency coaxial feed line impedance.Wherein, noninductive resistance hinders
Value and coalignment matches impedances.
Waveform generator is connected by the signal input part of high frequency coaxial feeder line and test fixture.Coalignment impedance
Match with high frequency coaxial feed line impedance.Coalignment resistance is 50 ohm.
The device is additionally included in HF current transformer signal input part self-inspection loop in parallel.Self-inspection loop includes control
Device, impulse generator and single-pole double-throw switch (SPDT), single-pole double-throw switch (SPDT) is by connecting outside high-frequency signals end or impulse generator end
Realize the switching of normal mode and Auto-Sensing Mode.
Electromagnetic coupling method may also be referred to as high frequency CT methods or pulse current method, be that a kind of measurement cable machinery shelf depreciation is wide
The method of general application.Electromagnetic coupling method mainly applies a current transducer for being similar to traditional Rogowsky coil.
It makees magnetic core using high frequency ferrite magnetic material, can do circlewise, can also make two semicircular rings, through hinge and busy hoop
Form an annulus.Wider frequency band can be made it have through special design, in favor of improving sensitivity and more completely gathering
Discharge signal.When shelf depreciation occurs for high-tension apparatus, corresponding pulse current is had on low-pressure side ground lead and is flowed through.Electricity
Rogowsky coil is exactly placed on cable termination or connector by the general principle of magnetic coupling method, through cable shield
Ground wire, flows through the partial discharge pulse current of cable shield to detect partial discharge by sensing.
Because Electromagnetic coupling method is that the shelf depreciation current signal in power cable ground wire is passed through into electromagnetic coupled coil
It is connected with measuring loop, without obtaining local discharge signal by coupled capacitor device in high-pressure side, therefore is suitable for
Check test and operating on-line monitoring after cable laying.In addition Electromagnetic coupling method is measured by electromagnetic coupled
Shelf depreciation electric current, due to not being electrically connected directly between high-tension cable and measuring loop, makes an uproar so as to suppression well
Sound.Simultaneously because external interference noise signal is different from local discharge signal amplitude versus frequency characte, therefore the premenstrual storing of signal of collection
After big device processing, usable spectrum analytic approach judges and recognized.
Oscillograph of the present utility model, its sample rate can be adjustable for 200MHz -2GHz, wherein, injection electric capacity is selected
The high-frequency ceramic electric capacity of 100pF ± 2%.Waveform generator is Agilent demarcation signal source, and its parameters is：Peak value electricity
It is flat：10V.The rising edge of a pulse time：No more than 5ns.Signal occurrence frequency：0~120Hz (adjustable).Output signal port：BNC
Power supply, continuous working period：Long-play state can be met.From above parameter, this AWG generator
Meet the requirements, when channel oscilloscope use DC50 Europe matching status, then signal source output amplitude can not be more than oscillograph range or
Handled using attenuator is added.
The sensor transmissions impedance experiments of embodiment 2
With reference to shown in Fig. 1, Fig. 2, signal generator UsThe adjustable voltage of output frequency, produces respective tones in test loop
Rate, peak-to-peak value between 10mA~30mA sinusoidal current signal.Frequency is adjusted in the range of 1MHz~120MHz, oscillography is used
Device measures the output voltage V that sensor (HFCT) is detected under different frequency f simultaneously2And noninductive resistance R (f)0The voltage V at two ends1
(f) the transfer impedance value under the frequency, is tried to achieve by formula (1).
Z (f)=R0(V2(f)/V1(f)) (1)
In formula：Transfer impedance value under Z (f)-input sinusoidal signal frequency f；
R0- resistance；
V2(f) output voltage of sensor is detected under-input sinusoidal signal frequency f；
V1(f) noninductive resistance R under-input sinusoidal signal frequency f0The output voltage at two ends.
Fig. 6 is 3~60MHz frequency band range sensor transmissions testing impedance design sketch, and Fig. 7 is 0~100MHz frequency band ranges
Sensor transmissions testing impedance design sketch.
The detector of embodiment 3 detects frequency test
With reference to shown in Fig. 1, Fig. 3, signal generator UsThe adjustable voltage of output frequency, passes through R0(R0Preferably 50 Ω ±
0.2% noninductive resistance) in test loop produce corresponding frequencies, peak-to-peak value between 5mA~10mA sinusoidal current believe
Number.Frequency is adjusted in the range of 0.5MHz~50MHz, passes through oscilloscope measurement resistance R0The voltage monitoring electric current at two ends, is being adjusted
Keep electric current constant during whole frequency.By test examination instrument (contain HFCT) display full-scale reading, (or the output of analog signal port is most significantly
Degree) when corresponding frequency should be located in 3MHz~30MHz frequency ranges, and 6dB bandwidth is no less than 2MHz.
The sensitivity test of embodiment 4
With reference to shown in Fig. 1, Fig. 4, steep-sided pulse generator UpVoltage pulse output, by injecting electric capacity C0In test loop
Pulse current is produced, simulation apparent charge amount is Q (Up×C0) local discharge signal, and by tested instrument (containing HFCT) detection
Pulse current in test loop.When Q is 50pC, tested instrument should be to be not less than 2:1 signal to noise ratio shows shelf depreciation arteries and veins
Punching.Signal to noise ratio is higher, shows that the detection sensitivity of instrument is higher.
The linearity of embodiment 5 is tested
Shown in the linearity test connection figure combination Fig. 1, Fig. 4.
By adjusting steep-sided pulse generator UpThe voltage amplitude of output, produces the apparent charge amount for being about 10pC and 1000pC
Q1And Q2, tested respectively, the measurement signal amplitude V shown by the tested instrument of record (containing HFCT)1And V2。
If the signal amplitude that detector is shown is linear graduation value (such as mV units), linearity error presses formula (2)
Calculate：
ε=abs (1- (V2/V1)/(Q2/Q1))×100 (2)
Note：V1, V2 unit are mV in formula.
If the signal amplitude that detector is shown is logarithmic scale value (such as dB units), linearity error presses formula (3)
Calculate：
Note：V1, V2 unit are dBmV in formula.
(2)~(3) in formula：
ε-linearity error %；
V2- input apparent charge amount Q2When tested instrument shown by signal amplitude；
V1- input apparent charge amount Q1When tested instrument shown by signal amplitude；
Q2- 5000pC apparent charge amounts；
Q1- 50pC apparent charge amounts.
The interference free performance of embodiment 6 is tested
With reference to shown in Fig. 1, Fig. 5, pass through steep-sided pulse generator UpWith injection electric capacity C0, apparent electricity is produced in test loop
Lotus amount is Q high-frequency pulse current, while using sinusoidal signal generator UsThrough Rs(50 Ω) produces the interference electric current of different frequency,
The input of tested sensing (HFCT) is applied to simultaneously.In the case of any given frequency interference electric current, it is allowed to which adjustment is tested
Instrument filter function.When tested apparent charge amount Q is 50pC, interference electric current IsPeak-to-peak value when being 25mA, be tested instrument equal energy
To be not less than 2:1 signal to noise ratio shows measured pulse signal.
The frequency of interference electric current preferably select 50kHz, 500kHz, 1MHz, 2MHz, 5MHz, 10MHz, 15MHz, 20MHz,
25MHz、30MHz、35MHz、40MHz。
The above is only preferred embodiment of the present utility model, it should be pointed out that：For the common skill of the art
For art personnel, on the premise of the utility model principle is not departed from, some improvements and modifications can also be made, these improve and
Retouching also should be regarded as protection domain of the present utility model.
Claims (9)
1. a kind of shelf depreciation high frequency electric detection means, it is characterised in that including waveform generator, oscillograph, noninductive
Resistance, injection electric capacity C0, test fixture and HF current transformer, the HF current transformer is arranged on the test fixture
Interior, the positive pole of the waveform generator connects the signal input part of the test fixture, the injection electric capacity C0With it is noninductive
One end of resistance is all connected with the signal output part of the test fixture, the injection electric capacity C0Connect with the other end of noninductive resistance
The negative pole of the waveform generator is connect, the noninductive resistance and HF current transformer are all connected with the oscillograph.
2. shelf depreciation high frequency electric detection means according to claim 1, it is characterised in that：The injection electric capacity C0For
High-frequency ceramic electric capacity.
3. shelf depreciation high frequency electric detection means according to claim 1, it is characterised in that：Also include self-inspection loop,
The self-inspection loop is in parallel with the HF current transformer, and the self-inspection loop includes controller, impulse generator and hilted broadsword
Commutator, the not moved end of the single-pole double-throw switch (SPDT) connects the controller, two moved ends point of the single-pole double-throw switch (SPDT)
Lian Jie not impulse generator and waveform generator.
4. shelf depreciation high frequency electric detection means according to claim 1, it is characterised in that：Also include coalignment,
The test fixture connects the coalignment.
5. shelf depreciation high frequency electric detection means according to claim 4, it is characterised in that：The resistance of the noninductive resistance
Value and the matches impedances of coalignment.
6. shelf depreciation high frequency electric detection means according to claim 4, it is characterised in that：The waveform signal occurs
Device is connected by the signal input part of high frequency coaxial feeder line and test fixture, the coalignment and high frequency coaxial feed line impedance
Match somebody with somebody.
7. shelf depreciation high frequency electric detection means according to claim 4, it is characterised in that：The coalignment is nothing
Sensing resistor.
8. shelf depreciation high frequency electric detection means according to claim 7, it is characterised in that：The resistance of the noninductive resistance
Resist for 50 ohm.
9. shelf depreciation high frequency electric detection means according to claim 1, it is characterised in that：The waveform signal occurs
Device is sinusoidal signal generator or steep-sided pulse generator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201621475217.9U CN206321749U (en) | 2016-12-30 | 2016-12-30 | A kind of shelf depreciation high frequency electric detection means |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621475217.9U CN206321749U (en) | 2016-12-30 | 2016-12-30 | A kind of shelf depreciation high frequency electric detection means |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108037428A (en) * | 2018-01-05 | 2018-05-15 | 中国电力科学研究院有限公司 | Program control type integration checking system for high frequency sensors |
| CN111487452A (en) * | 2020-04-20 | 2020-08-04 | 中国科学院微电子研究所 | Ultrafast current detection device and pulse test system |
| CN111537936A (en) * | 2020-06-11 | 2020-08-14 | 国网宁夏电力有限公司电力科学研究院 | High-frequency partial discharge signal reconstruction method and system |
| CN111537935A (en) * | 2020-06-11 | 2020-08-14 | 国网宁夏电力有限公司电力科学研究院 | High-frequency partial discharge anti-interference function verification method and system |
| CN112285617A (en) * | 2020-10-23 | 2021-01-29 | 南京谷贝电气科技有限公司 | Transformer electrical fault early warning system and device |
| CN113311291A (en) * | 2021-05-28 | 2021-08-27 | 国网江苏省电力有限公司无锡供电分公司 | Partial discharge detection sensitivity testing device and method for long-section high-voltage cable |
| CN114578121B (en) * | 2022-04-11 | 2024-04-19 | 南方电网数字电网研究院有限公司 | High-voltage measurement method, system and device |
-
2016
- 2016-12-30 CN CN201621475217.9U patent/CN206321749U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108037428A (en) * | 2018-01-05 | 2018-05-15 | 中国电力科学研究院有限公司 | Program control type integration checking system for high frequency sensors |
| CN111487452A (en) * | 2020-04-20 | 2020-08-04 | 中国科学院微电子研究所 | Ultrafast current detection device and pulse test system |
| CN111487452B (en) * | 2020-04-20 | 2022-07-01 | 中国科学院微电子研究所 | Ultrafast current detection device and pulse test system |
| CN111537936A (en) * | 2020-06-11 | 2020-08-14 | 国网宁夏电力有限公司电力科学研究院 | High-frequency partial discharge signal reconstruction method and system |
| CN111537935A (en) * | 2020-06-11 | 2020-08-14 | 国网宁夏电力有限公司电力科学研究院 | High-frequency partial discharge anti-interference function verification method and system |
| CN112285617A (en) * | 2020-10-23 | 2021-01-29 | 南京谷贝电气科技有限公司 | Transformer electrical fault early warning system and device |
| CN113311291A (en) * | 2021-05-28 | 2021-08-27 | 国网江苏省电力有限公司无锡供电分公司 | Partial discharge detection sensitivity testing device and method for long-section high-voltage cable |
| CN114578121B (en) * | 2022-04-11 | 2024-04-19 | 南方电网数字电网研究院有限公司 | High-voltage measurement method, system and device |
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