CN106841747A - Dash current tests residual voltage pressure tester and method - Google Patents

Dash current tests residual voltage pressure tester and method Download PDF

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Publication number
CN106841747A
CN106841747A CN201710060047.0A CN201710060047A CN106841747A CN 106841747 A CN106841747 A CN 106841747A CN 201710060047 A CN201710060047 A CN 201710060047A CN 106841747 A CN106841747 A CN 106841747A
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CN
China
Prior art keywords
inductance
residual voltage
resistance
harmonic
resistor
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CN201710060047.0A
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Chinese (zh)
Inventor
刘志杰
黄炜辉
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AIPUKESI ELECTRONIC ELEMENT (ZHUHAI BONDED AREA) Co Ltd
Epcos Zhuhai FTZ Co Ltd
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AIPUKESI ELECTRONIC ELEMENT (ZHUHAI BONDED AREA) Co Ltd
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Priority to CN201710060047.0A priority Critical patent/CN106841747A/en
Publication of CN106841747A publication Critical patent/CN106841747A/en
Pending legal-status Critical Current

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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00Arrangements for measuring currents or voltages or for indicating presence or sign thereof

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)

Abstract

The invention discloses dash current experiment residual voltage pressure tester and method, including divider, harmonic inductance, discharging gap and electric capacity C, the first end of the harmonic inductance and the first end of electric capacity C are connected to the two ends of discharging gap, second end connecting test product of the harmonic inductance, the second end end ground connection of the electric capacity C, the divider includes first resistor R1 and second resistance Rd, the first resistor first end and the ends of second resistance Rd second connect, the ends of second resistance Rd second ground connection, it is characterised in that:The device also includes inductance, second end of inductance one end connection first resistor R1, the second end of other end connection harmonic inductance, and the inductance induced potential direction is in opposite direction with the parasitic induced voltage of connecting line.Induced voltage present invention introduces electric current goes to offset influence of the voltage of stray inductance generation to product residual voltage, improves the precision of measurement, reduces the difficulty of divider installation.

Description

Dash current tests residual voltage pressure tester and method
Technical field
The present invention relates to the voltage measurement that arrester, high-voltage surge protector, energy piezo-resistance class dash current are tested Technical field, more particularly to dash current test residual voltage pressure tester and method.
Background technology
During high-voltage impact Current experiments(For example:8/20 μ S rush of currents ripple, 4/10 μ S rush of current ripples), one As residual voltage peak value is measured with divider, because there is a certain distance to need connecting line to connect between divider and the product of measurement, Connecting line its resistance value under high frequency heavy current pulse is very small, and electricresistance effect is negligible, but its stray inductance can not be neglected Slightly.About 10 centimetres of 0.1uH.Its residual voltage Ua=L*Ipeak/dt when dash current passes through this connecting line, so its residual voltage waveform It is the differential of current waveform.When electric current reaches peak value, residual voltage waveform pass zero point.
If L=0.1uH, dt=10us, Ipeak=10kA, Ua=100V is can be evaluated whether, if 20 centimetres of electrode connecting line, Ua =200V;If electric current Ipeak increases, surveying Ua also increases.
Fig. 1 is the oscillogram of ideally voltage and electric current, and Fig. 2 is the 4/10 μ S electric currents punching under actual short circuit condition Ripple figure is hit, voltage is " 0 " under short circuit condition in theory, actually since the inductance on connecting line, in electric current Ipeak in 35KA When, the voltage Ua that stray inductance is produced is about 3.5KV, and when electric current Ipeak reaches peak value, residual voltage waveform pass zero point.
4/10 μ S rush of current ripple figures when Fig. 3 is actual measurement zinc oxide valve plate, in theory voltage Upeak Ying Yu electricity Stream Ipeak reaches peak value simultaneously, actually since the inductance on connecting line, when electric current Ipeak is in 35KA, stray inductance is produced Voltage Ua be superimposed upon on the voltage Upeak of product, and residual voltage waveform peak is ahead of electric current and reaches peak value, Voltage Peak now Value is inaccurate.
The solution general to this problem is to shorten connecting line as far as possible, but because of safety and assembling in real process Problem, connecting line can not possibly be felt less to " 0 ", so influence of the stray inductance to residual voltage cannot be eliminated.
The content of the invention
Based on the deficiencies in the prior art, it is an object of the invention to provide dash current experiment residual voltage pressure tester and method, The induced voltage Ub for introducing electric current goes to offset influences of the voltage Ua of stray inductance generation to product residual voltage, improves the accurate of measurement Degree, reduces the difficulty that divider is installed.
To achieve the above object, the technical scheme is that:
Dash current tests residual voltage pressure tester, including divider, harmonic inductance, discharging gap and electric capacity C, the harmonic inductance First end and the first end of electric capacity C be connected to the two ends of discharging gap, the second end connecting test product of the harmonic inductance, The second end end ground connection of the electric capacity C, the divider includes first resistor R1 and second resistance Rd, the first resistor first End and the ends of second resistance Rd second connection, the ends of second resistance Rd second ground connection, device also include inductance, the electricity Sense one end connects second end of first resistor R1, and the other end connects the second end of harmonic inductance, and the inductance induced potential side To in opposite direction with the parasitic induced voltage of connecting line.
Further, the coil of the inductance is sheathed on outside the harmonic inductance.
Further, the inductance value of the inductance is the half of harmonic inductance.
Further, the test product is in series with the inductance coil for high current to be transformed to low current.
Further, the resistance ratio of the first resistor R1 and second resistance Rd is adjustable.
Dash current tests residual voltage pressure testing method, including tests residual voltage pressure tester measurement residual voltage with dash current, including An inductance, the induced voltage that the inductance is formed and survey are connected in the measuring loop of dash current experiment residual voltage pressure tester The parasitic induced voltage that connecting line causes in amount loop is in opposite direction, for offsetting the parasitic induced voltage.
Further, the dash current experiment residual voltage pressure tester includes divider, harmonic inductance, discharging gap and electricity Hold C, the first end of the harmonic inductance and the first end of electric capacity C are connected to the two ends of discharging gap, the of the harmonic inductance Two end connecting test products, the second end end ground connection of the electric capacity C, the divider includes first resistor R1 and second resistance Rd, the first resistor first end and the ends of second resistance Rd second connect, the ends of second resistance Rd second ground connection, the dress Putting also includes inductance, and second end of inductance one end connection first resistor R1, the other end connects the second end of harmonic inductance, and The inductance induced potential direction is in opposite direction with the parasitic induced voltage of connecting line.
Further, the inductance value of the inductance is the half of harmonic inductance.
Further, the resistance ratio of the first resistor R1 and second resistance Rd is adjustable.
Further, the test product is in series with the inductance coil for high current to be transformed to low current.
Beneficial effects of the present invention are:The induced voltage for introducing electric current goes the voltage for offsetting stray inductance generation residual to product The influence of pressure, improves the precision of measurement, reduces the difficulty of divider installation.
Brief description of the drawings
Fig. 1 is the waveform of ideally voltage and electric current;
Fig. 2 be original method short-circuit conditions under 4/10 μ S rush of current ripple figures;
4/10 μ S rush of current ripple figures when Fig. 3 is original method testing zinc oxide valve plate;
Fig. 4 is the schematic equivalent circuit of the specific embodiment of the invention;
Fig. 5 is 4/10 μ S rush of current ripple figures under the short circuit condition of the specific embodiment of the invention;
4/10 μ S rush of current ripple figures when Fig. 6 is the measurement zinc oxide valve plate of the specific embodiment of the invention.
Specific embodiment
The technique effect of design of the invention, concrete structure and generation is carried out clearly below with reference to embodiment and accompanying drawing Chu, it is fully described by, to be completely understood by the purpose of the present invention, feature and effect.Obviously, described embodiment is this hair Bright a part of embodiment, rather than whole embodiments, based on embodiments of the invention, those skilled in the art is not paying The other embodiment obtained on the premise of creative work, belongs to the scope of protection of the invention.
As shown in figure 4, dash current experiment residual voltage pressure tester, including divider 1, be sequentially connected harmonic inductance 2, put Electric gap 3 and electric capacity C, the second end connecting test product 4 of harmonic inductance 2, the other end ground connection of electric capacity C, divider 1 include string The first resistor R1 and second resistance Rd of connection, dash current experiment residual voltage pressure tester also include inductance 5, and inductance coil is sheathed on Outside the harmonic inductance, one end connects second end of first resistor R1, the second end of other end connection harmonic inductance 2, and inductance Induced potential Ub directions are in opposite direction with the parasitic induced voltage Ua's of connecting line.The resistance of first resistor R1 and second resistance Rd Ratio is adjustable, and the lead for measuring residual voltage is connected between first resistor R1 and second resistance Rd, and the lead can be connected and shown The voltage measuring apparatus such as ripple device.
The inductance value of inductance is half of harmonic inductance or so, and its requirement is not very strict, mainly in short-circuit test When, zero crossing time of induced potential should in or so current peak time, the present embodiment be directly by divider high-voltage conducting wires around Realized by increasing and reducing the number of turn outside harmonic inductance.
The reversed peak of inductance induced potential Ub less than current peak 30%, this mainly with the reversed peak size of electric current Correlation, general rush of current test request anti-phase peak value is all that requirement is less than 30%.
Test product is in series with the inductance coil 6 for measuring electric current, and inductance coil 6 will be changed by the high current of product The testing current products such as oscillograph are accessed after into low current, current measurement is carried out.
Dash current tests residual voltage pressure testing method, including tests residual voltage pressure tester measurement residual voltage with dash current, including An inductance, the induced voltage Ub that inductance is formed and measurement are connected in the measuring loop of dash current experiment residual voltage pressure tester The parasitic induced voltage Ua that connecting line causes in loop is in opposite direction, for offsetting the parasitic induced voltage.
Harmonic inductance, discharging gap and electric capacity that dash current experiment residual voltage pressure tester includes divider, is sequentially connected C, the second end connecting test product of harmonic inductance, electric capacity C the other end ground connection, divider include series connection first resistor R1 and Second resistance Rd, the coil of inductance is sheathed on outside the harmonic inductance, and one end connects second end of first resistor R1, the other end Connect the second end of harmonic inductance.The inductance value of same inductance is the half of harmonic inductance, the reverse peak of inductance induced potential Ub Value electric current is less than the 30% of current peak, and the resistance ratio of first resistor R1 and second resistance Rd is adjustable.
Fig. 5 is 4/10 μ S rush of current ripple figures under the present embodiment short circuit condition, and Fig. 6 is the present embodiment measurement zinc oxide 4/10 μ S rush of current ripple figures during valve block;After introducing inductance induced voltage Ub, the peak value that voltage is measured when short-circuit is negative sense , and the residual voltage Upeak of zinc oxide product be it is positive, they can only be influenceed after being superimposed the wave front time of voltage peak without Influence peak value;And stray inductance change also can only influence the ripple of voltage peak within the specific limits caused by the length of connecting line Preceding time, that is, the length of connecting line voltage negative value when only influenceing short circuit(The superposition value of Ua and Ub)Size change, Will not cause product residual voltage peak change when product is surveyed.
When dash current Ipeak increasings are tested, measuring method originally makes to measure because parasitic induced voltage Ua increases Voltage Upeak it is further higher, residual voltage measurement it is linear also very poor, in new departure when dash current Ipeak increases, parasitism Induced voltage Ua increases, but the current sense voltage Ub of introducing inductance can also increase, and be cancelled out each other because Ua and Ub is in opposite direction, So as to the change of Upeak will not be caused.
It should be noted that the above is presently preferred embodiments of the present invention, the invention is not limited in above-mentioned Implementation method, as long as it reaches technique effect of the invention with identical means, should all belong to protection scope of the present invention.

Claims (10)

1. dash current experiment residual voltage pressure tester, including divider, harmonic inductance, discharging gap and electric capacity C, the harmonic electricity The first end of sense and the first end of electric capacity C are connected to the two ends of discharging gap, and the second end connecting test of the harmonic inductance is produced Product, the second end end ground connection of the electric capacity C, the divider includes first resistor R1 and second resistance Rd, the first resistor First end and the ends of second resistance Rd second connect, the ends of second resistance Rd second ground connection, it is characterised in that:The device is also Including inductance, second end of inductance one end connection first resistor R1, the other end connects the second end of harmonic inductance, and described Inductance induced potential direction is in opposite direction with the parasitic induced voltage of connecting line.
2. dash current as claimed in claim 1 tests residual voltage pressure tester, it is characterised in that:The coil of the inductance is arranged In outside the harmonic inductance.
3. dash current as claimed in claim 1 or 2 tests residual voltage pressure tester, it is characterised in that:The inductance of the inductance It is the half of harmonic inductance to measure.
4. dash current as claimed in claim 1 tests residual voltage pressure tester, it is characterised in that:The test product is in series with Inductance coil for high current to be transformed to low current.
5. dash current as claimed in claim 1 tests residual voltage pressure tester, it is characterised in that:The first resistor R1 and The resistance ratio of two resistance Rd is adjustable.
6. dash current tests residual voltage pressure testing method, including tests residual voltage pressure tester measurement residual voltage, its feature with dash current It is:It is included in one inductance of connection, the sense that the inductance is formed in the measuring loop of dash current experiment residual voltage pressure tester Answer voltage in opposite direction with the parasitic induced voltage that connecting line in measuring loop causes, for offsetting the parasitic induced voltage.
7. dash current as claimed in claim 6 tests residual voltage pressure testing method, it is characterised in that:The dash current experiment is residual Pressure pressure tester includes divider, harmonic inductance, discharging gap and electric capacity C, the of the first end of the harmonic inductance and electric capacity C One end is connected to the two ends of discharging gap, the second end connecting test product of the harmonic inductance, the second end end of the electric capacity C Ground connection, the divider includes first resistor R1 and second resistance Rd, the first resistor first end and the second resistance Rd Second end connects, and the ends of second resistance Rd second ground connection, the device also includes inductance, and described inductance one end connects first resistor Second end of R1, the other end connects the second end of harmonic inductance, and the inductance induced potential direction is felt with the parasitic of connecting line Answer the in opposite direction of voltage.
8. dash current as claimed in claim 7 tests residual voltage pressure testing method, it is characterised in that:The inductance value of the inductance is The half of harmonic inductance.
9. dash current as claimed in claim 7 tests residual voltage pressure testing method, it is characterised in that:The first resistor R1 and The resistance ratio of two resistance Rd is adjustable.
10. dash current as claimed in claim 7 tests residual voltage pressure tester, it is characterised in that:The test product series connection There is the inductance coil for high current to be transformed to low current.
CN201710060047.0A 2017-01-24 2017-01-24 Dash current tests residual voltage pressure tester and method Pending CN106841747A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112083214A (en) * 2020-08-28 2020-12-15 广东电网有限责任公司广州供电局 Current measuring device for pilot discharge process

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Publication number Priority date Publication date Assignee Title
CN112083214A (en) * 2020-08-28 2020-12-15 广东电网有限责任公司广州供电局 Current measuring device for pilot discharge process

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Application publication date: 20170613