AU2020101999A4 - Device for testing current distribution of zinc oxide varistor valve disc - Google Patents

Device for testing current distribution of zinc oxide varistor valve disc Download PDF

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Publication number
AU2020101999A4
AU2020101999A4 AU2020101999A AU2020101999A AU2020101999A4 AU 2020101999 A4 AU2020101999 A4 AU 2020101999A4 AU 2020101999 A AU2020101999 A AU 2020101999A AU 2020101999 A AU2020101999 A AU 2020101999A AU 2020101999 A4 AU2020101999 A4 AU 2020101999A4
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AU
Australia
Prior art keywords
zinc oxide
resistor
silver slurry
valve disc
current distribution
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
AU2020101999A
Inventor
Jinliang He
Jun Hu
Xiaoding Hu
Pengfei Meng
Xiaoji Meng
Qingyun Xie
Xiao Yang
Chao Yuan
Zhikang Yuan
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Xi'an Xidian Arrester Co Ltd
Tsinghua University
Original Assignee
Xian Xidian Arrester Co Ltd
Tsinghua University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Priority to AU2020101999A priority Critical patent/AU2020101999A4/en
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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/175—Indicating the instants of passage of current or voltage through a given value, e.g. passage through zero
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
    • H01C7/10—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material voltage responsive, i.e. varistors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
    • H01C7/10—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material voltage responsive, i.e. varistors
    • H01C7/105—Varistor cores
    • H01C7/108—Metal oxide
    • H01C7/112—ZnO type
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
    • H01C7/18—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material comprising a plurality of layers stacked between terminals

Abstract

The disclosure provides a device for testing current distribution of a zinc oxide varistor valve disc, including a zinc oxide resistor, copper electrodes and an impact current generation device, wherein the impact current generation device, the copper electrodes and the zinc oxide resistor are successively connected from left to right, the right side of the zinc oxide resistor is provided with an aluminum electrode layer, the left side of the zinc oxide resistor is provided with silver slurry electrode layers, the copper electrodes are electrically connected with the silver slurry electrode layers, the quantity of the copper electrodes is plural, the plurality of silver slurry electrode layers divide the left side of the zinc oxide resistor into a plurality of resistor rings. The disclosure has the beneficial effects that in order to overcome the defects in the prior art, a device for testing current distribution of a zinc oxide varistor valve disc is provided, the single surface of the zinc oxide varistor is sprayed with the aluminum electrode, the other surface is coated with intermediate temperature silver slurry to form a series of equal-area concentric circle annular electrodes, so as to be adaptive to measurement of current passing through different current channels, and to allow the test result to more truly reflect the real throughflow condition inside the zinc oxide varistor. 1 3 2 1 4 FIG.1 1

Description

3 2 1
4
FIG.1
DEVICE FOR TESTING CURRENT DISTRIBUTION OF ZINC OXIDE VARISTOR VALVE DISC TECHNICAL FIELD
[0001] The disclosure relates to the field of measurement of electrical performance
and electrical parameters of a zinc oxide varistor, and particularly relates to a device
for testing current distribution of a zinc oxide varistor valve disc.
BACKGROUND
[0002] A zinc oxide resistor valve disc is a core element of a zinc oxide arrester,
which is used to prevent external lightning stroke or internal overvoltage impact
from damaging power equipment. Due to the strict production process and complex
preparation process of a ZnO varistor, the electrical parameters of the generated
resistor valve disc have a certain difference with difference in batches. The basic
electrical parameters of the ZnO varistor valve disc include nonlinear coefficients,
leakage current, a voltage gradient and a residual voltage ratio which are standards
directly determining whether the ZnO varistor can meet the requirements of practical
engineering application. In addition, the uniformity of current distribution of the
resistor valve disc along the surface is also very crucial. When the power system
suffers from lightning stroke or generates internal overvoltage so as to need arrester
action, the current will be led out along the zinc oxide resistor valve disc. The
distribution of current flowing through the varistor under the large current impact
restricts the energy absorption capability of the varistor. Ideally, under the large
current impact, current channels flowing through the varistor valve disc should be
uniformly distributed on the surface of the ZnO varistor valve disc, and then the ZnO
varistor can reach the maximum current bleeding capacity. If the current is not evenly
distributed along the surface of the varistor valve disc at this moment, it will lead to
overlarge local throughflow and overhigh temperature inside the valve disc so as to easily lead to local perforation or even bursts, and when the above local perforation or even bursts are serious, systematic failure in the power system is caused. The existing test methods are only for screening test valve discs based on whether the resistor valve disc can pass through various impact current waveforms, such as 8/20 s standard lightning wave, 2 ms square wave and 30/60 s operation wave, which can not truly reflect the real throughflow condition inside the ZnO varistor.
SUMMARY
[0003] The objective of the disclosure is to design a device for testing current
distribution of a zinc oxide varistor valve disc in order to solve the above problems. The specific design solution is as follows:
[0004] A device for testing current distribution of a zinc oxide varistor valve disc,
comprising a zinc oxide resistor, copper electrodes and an impact current generation device, wherein the impact current generation device, the copper electrodes and the zinc oxide resistor are successively connected from left to right, the right side of the zinc oxide resistor is provided with an aluminum electrode layer, the left side of the zinc oxide resistor is provided with the silver slurry electrode layers, the copper electrodes are electrically connected with the silver slurry electrode layers, the quantity of the silver slurry electrode layers is plural and the plurality of silver slurry electrode layers divide the left side of the zinc oxide resistor into a plurality of resistor rings.
[0005] The plurality of resistor rings are concentrically distributed with the center
of the zinc oxide resistor as a center of a circle, the center of the innermost resistor ring is a round silver slurry electrode layer, and annular silver slurry electrode layers are located between adjacent two resistor rings and outside the outermost resistor ring.
[0006] The radial sectional areas of the plurality of silver slurry electrode layers
are equal.
[0007] The annular radiuses of the annular structures of the resistor rings are equal.
[0008] The aluminum electrode layer is sprayed onto the right side of the zinc
oxide resistor.
[0009] The silver slurry electrode layer is sprayed onto the left side of the zinc
oxide resistor.
[0010] The quantity of the copper electrodes is plural, and the vertical sectional
areas of the plurality of copper electrodes in a front and back direction are equal, and equal to the radial sectional areas of the silver slurry electrode layers.
[0011] The device for testing current distribution of a zinc oxide varistor valve disc
obtained through the above technical solution of the disclosure has the beneficial effects:
[0012] In order to overcome the defects of the prior art, provided is a device for
testing current distribution of a zinc oxide varistor valve disc; the single surface of the zinc oxide varistor is sprayed with the aluminum electrode, the other surface is coated with intermediate temperature silver slurry to form a series of equal-area concentric circle annular electrodes, so as to be adaptive to measurement of current passing through different current passages, and the test result can more truly reflect the real throughflow condition inside the zinc oxide varistor.
BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Fig.1 is a structural diagram of a device for testing current distribution of a
zinc oxide varistor valve disc according to the disclosure.
[0014] Fig.2 is a diagram of a left view structure of a copper electrode according to
the disclosure.
[0015] Fig.3 is a diagram of a side view structure of a copper electrode according
to the disclosure.
[0016] Fig.4 is a current-voltage curve obtained by utilizing a device for testing
current distribution of a zinc oxide varistor valve disc to perform E-J feature test
according to the disclosure.
[0017] Fig.5 is a current distribution diagram of a zinc oxide resistor under 30/60
s operation wave impact performed by a device for testing current distribution of a
zinc oxide varistor valve disc according to the disclosure.
[0018] Fig.6 is a current distribution diagram of a zinc oxide resistor under 8/20
standard lightening stroke impact performed by a device for testing current
distribution of a zinc oxide varistor valve disc according to the disclosure.
[0019] In the drawings, 1, zinc oxide resistor; 2, copper electrode; 3, impact
current generation device; 4, aluminum electrode layer; 5, silver slurry electrode
layer; 6, resistor ring.
DESCRIPTION OF THE EMBODIMENTS
[0020] Next, the disclosure will be specifically described in combination with
accompanying drawings.
[0021] Fig.1 is a structural diagram of a device for testing current distribution of a
zinc oxide varistor valve disc according the disclosure; Fig.2 is a diagram of a left
view structure of a copper electrode according to the disclosure; Fig.3 is a diagram of
a side view structure of a copper electrode according to the disclosure. As shown in
Figs.1-3, a device for testing current distribution of a zinc oxide varistor valve disc
includes a zinc oxide resistor 1, copper electrodes 2 and an impact current generation
device 3, wherein the impact current generation device 3, the copper electrodes 2 and
the zinc oxide resistor 1 are successively connected from left to right, the right side
of the zinc oxide resistor 1 is provided with an aluminum electrode layer 4, the left
side of the zinc oxide resistor 1 is provided with the silver slurry electrode layers 5,
the copper electrodes 2 are electrically connected with the silver slurry electrode layers 5, the quantity of the silver slurry electrode layers is plural, and the plurality of silver slurry electrode layers 5 divide the left side of the zinc oxide resistor into a plurality of resistor rings 6.
[0022] The plurality of resistor rings 6 are concentrically distributed with the
center of the zinc oxide resistor 1 as a center of a circle, the center of the innermost
resistor ring 6 is a round silver slurry electrode layer, and annular silver slurry
electrode layers are located between adjacent two resistor rings 6 and outside the
outermost resistor ring 6.
[0023] The radial sectional areas of the plurality of silver slurry electrode layers 5
are equal.
[0024] The annular radiuses of the annular structures of the resistor rings 6 are
equal.
[0025] The aluminum electrode layer 4 is sprayed onto the right side of the zinc
oxide resistor 1.
[0026] The silver slurry electrode layer 5 is sprayed onto the left side of the zinc
oxide resistor 1.
[0027] The quantity of the copper electrodes 2 is plural, and the vertical sectional
areas of the plurality of copper electrodes 2 in a front and back direction are equal,
and equal to the radial sectional areas of the silver slurry electrode layers 5.
[0028] Example 1
[0029] An Impact current generator is used to test the current distribution of test
samples under the action of impact current. The equipment of the scientific research
laboratory is established in accordance with national standard test requirements. The
equipment can generate 8/20 s standard lightning wave, 2 ms square wave, 30/60 s
operation wave and other various impact current waveforms. The test sample selects
a D62-model resistor, and only four current channels are selected for test. The E-J
features of various annular electrodes in a small current region and in a middle current region were tested using a ZnO varistor volt-ampere feature measurement instrument. The voltage is gradually applied starting from 0, voltage values corresponding to current passing through various channels of the varistor from 1 A to 10 mA are respectively recorded, and then the E-J feature curve is drawn.
[0030] Fig.4 is a current-voltage curve obtained by utilizing a device for testing
current distribution of a zinc oxide varistor valve disc to perform E-J feature test
according to the disclosure. As shown in Fig.4, the typical E-J feature curve of the
D62-model resistor is shown below, the current ranges from 0.001mA to 5mA and
the current ranges from 0.001mA to 10A.
[0031] Example 2
[0032] An Impact current generator is used to test the current distribution of test
samples under the action of impact current. The equipment of the scientific research
laboratory is established in accordance with national standard test requirements. The
equipment can generate 8/20 s standard lightning wave, 2 ms square wave, 30/60 s
operation wave and other various impact current waveforms. The test sample selects
a D62-odel resistor, and only four current channels are selected for test. The E-J
features of various annular electrodes in a small current region and in a middle
current region were tested using a ZnO varistor volt-ampere feature measurement
instrument. The voltage is gradually applied starting from 0, and voltage values
corresponding to current passing through various channels of the varistor from 1 A
to 10 mA are respectively recorded.
[0033] Fig.5 is a current distribution diagram of a zinc oxide resistor under 30/60
s operation wave impact performed by a device for testing current distribution of a
zinc oxide varistor valve disc according to the disclosure. As shown in Fig.5, this test
tests current distribution under the 30/60 s operation wave impact. The maximum
impact valve of operation wave is 2.0 kA. In the process of test, since each impact
test needs to separately set the charging voltage value of the circuit, the current value
of each discharging is not increased in equal step length, but tends to progressively increase until maximum value.
[0034] Example 3
[0035] Fig.6 is a current distribution diagram of a zinc oxide resistor under 8/20
standard lightening stroke impact performed by a device for testing current distribution of a zinc oxide varistor valve disc according to the disclosure. As shown in Fig.6, this test tests current distribution under the 8/20 standard lightening wave impact. The maximum current valve of lightening stroke is 5 kA. In the process of test, since each impact test needs to separately set the charging voltage value of the circuit, the current value of each discharging is not increased in equal step length, but tends to progressively increase until maximum value.
[0036] The above technical solution only embodies the preferred technical solution
of the disclosure, and some changes that may be made to some parts by those skilled in the art embody the principle of the disclosure, and belong to the protective scope of the disclosure.

Claims (7)

Claims WHAT IS CLAIMED IS:
1. A device for testing current distribution of a zinc oxide varistor valve disc, comprising a zinc oxide resistor (1), copper electrodes (2) and an impact current generation device (3), wherein the impact current generation device (3), the copper electrodes (2) and the zinc oxide resistor (1) are successively connected from left to right, the right side of the zinc oxide resistor (1) is provided with an aluminum electrode layer (4), the left side of the zinc oxide resistor (1) is provided with the silver slurry electrode layers (5), the copper electrodes (2) are electrically connected with the silver slurry electrode layers (5), the quantity of the silver slurry electrode layers (5) is plural, and the plurality of silver slurry electrode layers (5) divide the left side of the zinc oxide resistor (1) into a plurality of resistor rings (6).
2. The device for testing current distribution of a zinc oxide varistor valve disc according to claim 1, wherein the plurality of resistor rings (6) are concentrically distributed with the center of the zinc oxide resistor (1) as a center of a circle, the center of the innermost resistor ring (6) is a round silver slurry electrode layer, and annular silver slurry electrode layers are located between adjacent two resistor rings (6) and outside the outermost resistor ring (6).
3. The device for testing current distribution of a zinc oxide varistor valve disc according to claim 1, wherein the radial sectional areas of the plurality of silver slurry electrode layers (5) are equal.
4. The device for testing current distribution of a zinc oxide varistor valve disc according to claim 1, wherein the annular radiuses of the annular structures of the resistor rings (6) are equal.
5. The device for testing current distribution of a zinc oxide varistor valve disc according to claim 1, wherein the aluminum electrode layer (4) is sprayed onto the right side of the zinc oxide resistor (1).
6. The device for testing current distribution of a zinc oxide varistor valve disc according to claim 1, wherein the silver slurry electrode layer (5) is sprayed onto the left side of the zinc oxide resistor (1).
7. The device for testing current distribution of a zinc oxide varistor valve disc according to claim 1, wherein the quantity of the copper electrodes (2) is plural, and the vertical sectional areas of the plurality of copper electrodes (2) along a front and back direction are equal, and equal to the radial sectional areas of the silver slurry electrode layers (5).
AU2020101999A 2020-08-26 2020-08-26 Device for testing current distribution of zinc oxide varistor valve disc Ceased AU2020101999A4 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2020101999A AU2020101999A4 (en) 2020-08-26 2020-08-26 Device for testing current distribution of zinc oxide varistor valve disc

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AU2020101999A AU2020101999A4 (en) 2020-08-26 2020-08-26 Device for testing current distribution of zinc oxide varistor valve disc

Publications (1)

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AU2020101999A4 true AU2020101999A4 (en) 2020-10-01

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Application Number Title Priority Date Filing Date
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Country Status (1)

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