阅读说明：本技术 一种用于工频电场测量仪整体校准的极板加工工艺 (Polar plate processing technology for integral calibration of power frequency electric field measuring instrument ) 是由 兰新生 姚晓 王方强 唐平 滕予非 周易谦 侯国彦 张业茂 何宇航 王志高 田倩 于 2019-10-25 设计创作，主要内容包括：本发明公开了一种用于工频电场测量仪整体校准的极板加工工艺,包括以下步骤：1)、将多块铝板焊接成等效直径大于等于4m的电极极板,焊接采用背面间隔式焊接且正面不焊接的方式；2)、在电极极板背面增加铝质等电位连接线；3)、在电极极板正面未焊接的缝隙内填充由导电铝粉和固化胶水组成的混合物；4)在电极极板正面设置银粉层。通过本发明所述工艺制备的极板具有平整度好、电压分布一致的优点,能够满足工频电场极板要求。(The invention discloses a polar plate processing technology for integral calibration of a power frequency electric field measuring instrument, which comprises the following steps: 1) welding a plurality of aluminum plates into electrode plates with equivalent diameters of more than or equal to 4m, wherein the welding adopts a mode of back surface interval welding and front surface non-welding; 2) adding an aluminum equipotential connecting line on the back of the electrode plate; 3) filling a mixture consisting of conductive aluminum powder and curing glue in the gap which is not welded on the front surface of the electrode plate; 4) and arranging a silver powder layer on the front surface of the electrode plate. The polar plate prepared by the process has the advantages of good flatness and consistent voltage distribution, and can meet the requirements of a power frequency electric field polar plate.)

1. A polar plate processing technology for integral calibration of a power frequency electric field measuring instrument is characterized by comprising the following steps:

1) welding a plurality of aluminum plates into electrode plates with equivalent diameters of more than or equal to 4m, wherein the welding adopts a mode of back surface interval welding and front surface non-welding;

2) adding an aluminum equipotential connecting line on the back of the electrode plate;

3) filling a mixture consisting of conductive aluminum powder and curing glue in the gap which is not welded on the front surface of the electrode plate;

4) and arranging a silver powder layer on the front surface of the electrode plate.

2. The polar plate processing technology for the integral calibration of the industrial frequency electric field measuring instrument as claimed in claim 1, wherein the total welding length of the adjacent aluminum plates is less than 1/2 of the length in full welding.

3. The polar plate processing technology for the integral calibration of the industrial frequency electric field measuring instrument according to claim 1, wherein the aluminum equipotential connecting line is arranged on the back of the electrode polar plate by welding.

4. The polar plate processing technology for the integral calibration of the power frequency electric field measuring instrument according to claim 1, wherein the ratio of the conductive aluminum powder to the curing glue is 1.2-2.5: 1.

5. the polar plate processing technology for the integral calibration of the power frequency electric field measuring instrument according to claim 4, wherein the ratio of the conductive aluminum powder to the curing glue is 1.8: 1.

6. the polar plate processing technology for the integral calibration of the power frequency electric field measuring instrument according to claim 1, wherein the thickness of the silver powder layer is 1-3 mm.

7. The polar plate processing technology for the integral calibration of the power frequency electric field measuring instrument according to claim 6, wherein the thickness of the silver powder layer is 2 mm.

8. The pole plate processing technology for the integral calibration of the power frequency electric field measuring instrument as claimed in claim 1, wherein the silver powder layer is arranged on the front surface of the electrode pole plate in a spraying mode.

Technical Field

The invention relates to the technical field of power equipment calibration, in particular to a polar plate processing technology for integrally calibrating a power frequency electric field measuring instrument.

Background

The power frequency electric field is an important evaluation index in the environmental impact evaluation and completion environment acceptance of power transmission and transformation engineering, and the device for measuring the power frequency electric field is called as a power frequency electric field measuring instrument, a power frequency electric field strength instrument, a power frequency electric field measuring device and the like, and according to the regulations of Chinese metering laws, the verification or the calibration of the devices is qualified when the device is used.

The national legal metering mechanism bears the quantity value tracing work of the equipment, but the prior legal metering mechanism does not contain a sensor bracket of the power frequency electric field measuring instrument when the power frequency electric field measuring instrument is calibrated, so that the use condition is inconsistent with the calibration condition.

Through a large amount of researches and actual measurement data, the performance of the sensor bracket has great influence on the measurement result of the power frequency electric field in the monitoring of the power frequency electric field strength of the power transmission and transformation project, and the relative humidity of air is greatly influenced by the humidity of the air after being more than 50 percent, so that the measured value of the power frequency electric field strength can reach 2 to 10 times of the normal value at most, and the minimum error also reaches 40 percent of the normal value. In order to ensure the consistency of the calibration result and the application situation, the sensor support together with the sensor should be put into a standard electric field for overall calibration during verification or calibration.

In order to construct a standard electric field capable of placing a 1.5m high sensor support, and ensure certain accuracy, at least 4m electrode plates with equivalent diameters are required to be processed to meet the requirement of calibration work, and the large-size electrode plates are easy to deform after being processed, cannot meet the flatness and voltage distribution uniformity required by a power frequency electric field electrode plate, and waste products occur to waste a large amount of funds.

Disclosure of Invention

The invention aims to provide a polar plate processing technology for the integral calibration of a power frequency electric field measuring instrument.

The invention is realized by the following technical scheme:

a polar plate processing technology for integral calibration of a power frequency electric field measuring instrument comprises the following steps:

1) welding a plurality of aluminum plates into electrode plates with equivalent diameters of more than or equal to 4m, wherein the welding adopts a mode of back surface interval welding and front surface non-welding;

2) adding an aluminum equipotential connecting line on the back of the electrode plate;

3) filling a mixture consisting of conductive aluminum powder and curing glue in the gap which is not welded on the front surface of the electrode plate;

4) and arranging a silver powder layer on the front surface of the electrode plate.

The electrode polar plate with the equivalent diameter of more than or equal to 4m needs to be welded with a plurality of aluminum plates, and the common welding mode (full welding) easily causes the deformation of the machined electrode polar plate and seriously affects the flatness required by the power frequency electric field polar plate. The electrode plate for the power frequency electric field also has to overcome the difficulty of the consistency of the positive surface voltage or the electric field distribution. Flatness and gaps after welding are factors that cause inconsistent distribution of voltage or electric field.

The back surface of the capacitor is specifically the surface of the capacitor which is used for forming the uniform standard electric field and is not corresponding to the two metal plates, and the front surface of the capacitor is specifically the surface of the capacitor which is used for forming the uniform standard electric field and is corresponding to the two metal plates.

When an aluminum electrode plate with the equivalent diameter of more than or equal to 4m is processed, the aluminum metal melting point is low, and the conventional full-welding process is easy to cause large deformation after full welding due to incomplete stress relief, so that the flatness of the electrode plate for constructing a uniform standard electric field cannot meet the requirement.

In order to solve the problem of flatness of the aluminum electrode plate, a mode of back surface interval welding and front surface non-welding is adopted, but the welding mode causes a gap between adjacent aluminum plates, and then the problem of gap electric field distortion or inconsistent voltage distribution exists, and in order to solve the problem of inconsistent front surface voltage or electric field distribution caused by the gap, the front surface is filled with a mixture of conductive aluminum powder and glue with curing property.

The invention solves the problem that the flatness cannot meet the requirement caused by the full welding mode of the aluminum polar plate by adopting the mode of back surface interval welding and front surface non-welding, and enhances the problem of the consistency of the voltage or electric field distribution on the front surface of the electrode by adding the equipotential connector on the back surface; the problem of gap electric field distortion or inconsistent voltage distribution caused by non-welding front surface filling by adopting a mixture of conductive aluminum powder and glue with curing property; the flatness, uniformity and conductivity of the surface of the electrode are enhanced by increasing the spraying of a silver powder layer on the front surface of the electrode.

Further, the total welded length of adjacent aluminum sheets is less than 1/2 for the full weld length.

The arrangement can avoid the deformation problem caused by full welding when the aluminum electrode plate with the equivalent diameter of more than or equal to 4m is processed.

Further, the aluminum equipotential connecting line is arranged on the back of the electrode plate in a welding mode.

The arrangement can ensure that the potential of the electrode plate meets the requirement of a uniform electric field.

Further, the ratio of the conductive aluminum powder to the curing glue is 1.2-2.5: 1.

if the glue ratio is too high, the mixture for filling gaps among the aluminum plates is soft, the conductivity is reduced, the integral resistance of the polar plates is increased, the pressure difference is caused, and the electric field distribution is not uniform; if the conductive aluminum powder has too high proportion, the fluidity of the mixture is poor, the mixture for filling gaps among aluminum plates is not completely filled, the conductivity is reduced, the overall resistance of the polar plate is increased, the pressure difference is caused, and the electric field distribution is not uniform.

The above arrangement can meet the flatness requirement of the surface of the processed pole plate and the equipotential requirement of the surface of the welded pole plate.

Further, the ratio of the conductive aluminum powder to the curing glue is 1.8: 1.

further, the thickness of the silver powder layer is 1-3 mm.

If the thickness of the silver powder is too thin, the surface of the polar plate is not completely covered due to the inconsistency of the surface flatness, the conductivity is reduced, the integral resistance of the polar plate is increased, the pressure difference is caused, and the electric field distribution is not uniform; if the thickness of the silver powder is too thick, the cost is increased, and the silver powder is easy to fall off, rust and blacken and the like due to the fact that the silver powder is not firmly bonded in the construction process.

The arrangement can ensure that the silver powder layer can meet the flatness requirement of the surface of the processed pole plate and can meet the equipotential requirement of the surface of the welded pole plate.

Further, the thickness of the silver powder layer was 2 mm.

Further, the silver powder layer is arranged on the front surface of the electrode plate in a spraying mode.

Compared with the prior art, the invention has the following advantages and beneficial effects:

the invention solves the problem that the flatness cannot meet the requirement caused by the full welding mode of the aluminum polar plate by adopting the mode of back surface interval welding and front surface non-welding, and enhances the problem of the consistency of the voltage or electric field distribution on the front surface of the electrode by adding the equipotential connector on the back surface; the problem of gap electric field distortion or inconsistent voltage distribution caused by non-welding front surface filling by adopting a mixture of conductive aluminum powder and glue with curing property; the flatness, uniformity and conductivity of the surface of the electrode are enhanced by increasing the spraying of a silver powder layer on the front surface of the electrode.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not used as limitations of the present invention.