絕緣材料介電強度測試儀/塑料薄膜電氣強度測試儀-計算機控制

ZJC-50KV(5萬伏)

滿足標準：GB/T 1408-2006 絕緣材料電氣強度試驗方法

          GB/T1695-2005 硫化橡膠工頻電壓擊穿強度和耐電壓強度試驗

          GB/T3333 電纜紙工頻電壓擊穿試驗方法

          HG/T 3330絕緣漆漆膜擊穿強度測定法

          GB/T 12656 電容器紙工頻電壓擊穿試驗方法

          ASTM D149 固體電絕緣材料在工業(yè)電源頻率下的介電擊穿電壓和介電強度的試驗方法.

ZJC-50KV   ZJC-100KV 可選

一、適用范圍及功能

絕緣材料介電強度測試儀/塑料薄膜電氣強度測試儀主要適用于固體絕緣材料（如：塑料、橡膠、層壓材料、薄膜、樹脂、云母、陶瓷、玻璃、絕緣漆等絕緣材料及絕緣件）在工頻電壓或直流電壓下?lián)舸姸群湍碗妷旱臏y試。

由電腦控制，是我公司自主研發(fā)的全新第三代介電擊穿檢測儀器，電子控制系統(tǒng)是通過西門子PLC控制，數(shù)據(jù)采集方式通過光電隔離，有效解決試驗過程中的抗干擾問題，軟件操作使用方便，能夠?qū)崟r顯示動態(tài)曲線，同時升壓速率無級可調(diào)，可以根據(jù)自己的需要進行升壓速率調(diào)節(jié)，調(diào)節(jié)范圍在100V-3000V/S，使升壓速率真正做到勻速、準確，并能夠準確測出漏電電流的數(shù)據(jù)?？蓪崟r繪制試驗曲線，顯示試驗數(shù)據(jù)，判斷準確，并可保存，分析，打印試驗數(shù)據(jù)。

系統(tǒng)能夠自動判別試樣擊穿并采集擊穿電壓數(shù)據(jù)及泄露電流，同時能夠在擊穿的瞬間電壓迅速降低自動歸零。軟件系統(tǒng)操作方便，性能穩(wěn)定，安全可靠。

二、軟件功能:

01、軟件平臺：WINDOWS窗口操作平臺，界面直觀，便于操作

02、曲線顯示：在實驗過程中可以動態(tài)顯示試驗曲線

03、數(shù)據(jù)導出：可以對試驗結(jié)果導入EXCEL表格

04、實驗報告：可以人為設置報告名稱，并對實驗報告進行打印

05、試驗方式：可以根據(jù)需求對直流試驗和交流試驗進行靈活選擇

06、試驗方法：可以根據(jù)需求自行選擇擊穿電壓、耐壓試驗、梯度試驗

07、參數(shù)設置：可以根據(jù)不同的試驗方式及試驗方法靈活設置所需的不同參數(shù)值

08、試樣設置：可對不同標準的試樣參數(shù)靈活設置

09、人員管理：設置用戶名及密碼，不同的操作員登入進行不同的試驗，互不影響

10、標準選擇：含有不同標準，可根據(jù)需求自行選擇

11、連續(xù)操作：連續(xù)操作試驗時，可直接在軟件里結(jié)束試驗，進行二次試驗

三、技術要求：

01、輸入電壓： 交流 220 V
02、輸出電壓： 交流 0--50 KV ; 
               直流 0—50 KV
03、電器容量： 3KVA
04、高壓分級： 0--5KV； 0-10KV； 0--20KV；0--50KV 

05、升壓速率： 100 V/S  200 V/S  500 V/S  1000 V/S  2500 V/S  3000 V/S   

06、試驗方式：
           直流試驗：1、勻速升壓  2、梯度升壓  3、耐壓試驗 
           交流試驗：1、勻速升壓  2、梯度升壓  3、耐壓試驗

07、擊穿判停方式：1、電壓判停  2、電流判停
  08、電壓試驗精度： ≤ 1％

09、電極規(guī)格：1、片材電極 ￠25mm  兩個   片材電極 ￠75mm一個

10、主機尺寸：長寬高-800*700*1600（MM）

11、操作臺尺寸：長寬高-800*700*650（MM）

12、油槽尺寸：長寬高-300*200*150

13、設備重量：約100KG
四、安全保護：

 本儀器具有比較完善的安全防護措施：

本試驗儀器電路保護控制：

（1）超壓保護 （2）過流保護 （3）短路保護 （4）漏電保護 （5）軟件誤操作保護

五、試驗方式

1、絕緣試樣空氣中試驗

2、絕緣試樣浸油中試驗

六、試驗界面

參數(shù)設置界面截圖

打印預覽界面截圖

七、主要配置

Voltage breakdown tester - computer control
ZJC-50KV (50 thousand volts)
Meet the standard: electrical strength test method for 1408-2006 GB/T insulating material
Test of power frequency voltage breakdown strength and voltage endurance of GB/T1695-2005 vulcanized rubber
Test method for power frequency voltage breakdown of GB/T3333 cable paper
Determination of breakdown strength of HG/T 3330 insulating paint film
Test method for power frequency voltage breakdown of GB/T 12656 capacitor paper
Standard Test Method for dielectric breakdown voltage and dielectric strength of D149 ASTM solid electrical insulating materials at industrial power frequencies.
Applicable scope and function
The dielectric strength of electrical film / rubber plastic dielectric strength tester is mainly used in solid insulating materials (such as: plastic, rubber, lamination material, film, resin, mica, ceramic, glass, insulating paint and other insulation materials and parts) in the frequency of the voltage or DC voltage breakdown strength and voltage withstand test hit.
Thin film electrical dielectric strength / rubber plastic dielectric strength tester controlled by computer, is my company independent research and development of new third generation dielectric breakdown testing instrument, electrical film dielectric strength of rubber / plastic dielectric strength tester electronic control system is controlled by SIEMENS PLC, a data acquisition mode by photoelectric isolation, effectively solve anti interference problem in the test process, the software has the advantages of convenient operation, can display the dynamic curve, while the pressure rate can be adjusted, can according to their own needs to boost rate adjustment, adjustment in the range of 100V-3000V/S, so that the pressure rate truly uniform and accurate, and can accuray measure the leakage current data. Can draw the test curve in real time, display the test data, judge accuray, and can save, analysis, print the test data.
The dielectric strength of electrical film / rubber plastic dielectric strength test instrument system can automatically determine the sample breakdown and acquisition breakdown voltage and leakage current data, and can rapidly reduce the auto zero at the instant of the breakdown voltage. Software system is easy to operate, stable performance, safe and reliable.
Two, software function:
01, software platform: WINDOWS window operating platform, intuitive interface, easy to operate
02, the curve shows: in the experimental process can be dynamic display test curve
03, data export: the test results can be imported into the EXCEL table
04, the experimental report: you can set the name of the report, and the report of the experiment to print
05, test methods: according to the needs of the DC test and AC test for flexible selection
06, test methods: according to the demand to choose their own breakdown voltage, voltage test, gradient test
07, parameter setting: according to different test methods and test methods can be flexibly set the different parameters
08, sample setting: can be different standards of the sample parameters of flexible settings
09, personnel management: set the user name and password, different operators to log in for different tests, do not affect each other
10, the standard choice: contains different standards, according to the needs of their own choice
11, continuous operation: continuous operation of the test, can be directly in the software to end the test, the two test
Three, technical requirements:
01, input voltage: AC 220 V
02, output voltage: AC KV 0--50;
DC 0 - 50 KV
03, electrical capacity: 3KVA
04, high pressure classification: 0--5KV; 0-10KV; 0--20KV; 0--50KV
05, boost speed: 100 V/S 200 V/S 500 V/S 1000 V/S 2500 V/S 3000 V/S
06, test methods:
DC test: 1, uniform step up 2, gradient boost 3, pressure test
AC test: 1, uniform step up 2, gradient boost 3, pressure test
07, breakdown and sentenced to stop: 1, voltage sentenced to stop 2, the current sentenced to stop
08, voltage test accuracy: less than 1%
09, electrode size: 1, two 25mm of electrode sheet sheet electrode of a 75mm
10, the host size: long and wide high -800*700*1600 (MM)
11, operating table size: long and wide high -800*700*650 (MM)
12, oil tank size: long and wide high -300*200*150
13, equipment weight: about 100KG
Four, safety protection:
The instrument has more perfect security measures:
Circuit protection and control of the test instrument:
(1) over voltage protection (2) over current protection (3) short circuit protection (4) leakage protection (5) software error operation protection
Five, test methods
1, insulation test specimens in the air
2, insulation test specimen immersed in

擊穿形式有哪些？

電介質(zhì)擊穿

固體電介質(zhì)擊穿 導致?lián)舸┑膠ui低臨界電壓稱為擊穿電壓。均勻電場中，擊穿電壓與介質(zhì)厚度之比稱為擊穿電場強度（簡稱擊穿場強，又稱介電強度）。它反映固體電介質(zhì)自身的耐電強度。不均勻電場中，擊穿電壓與擊穿處介質(zhì)厚度之比稱為平均擊穿場強，它低于均勻電場中固體介質(zhì)的介電強度。固體介質(zhì)擊穿后，由于有巨大電流通過，介質(zhì)中會出現(xiàn)熔化或燒焦的通道，或出現(xiàn)裂紋。脆性介質(zhì)擊穿時，常發(fā)生材料的碎裂，可據(jù)此破碎非金屬礦石。

固體電介質(zhì)擊穿

固體電介質(zhì)擊穿有3種形式 ：電擊穿、熱擊穿和電化學擊穿。

電擊穿

電擊穿是因電場使電介質(zhì)中積聚起足夠數(shù)量和能量的帶電質(zhì)點而導致電介質(zhì)失去絕緣性能。熱擊穿是因在電場作用下，電介質(zhì)內(nèi)部熱量積累、溫度過高而導致失去絕緣能力。電化學擊穿是在電場、溫度等因素作用下，電介質(zhì)發(fā)生緩慢的化學變化，性能逐漸劣化，zui終喪失絕緣能力。固體電介質(zhì)的化學變化通常使其電導增加 ， 這會使介質(zhì)的溫度上升，因而電化學擊穿的zui終形式是熱擊穿。溫度和電壓作用時間對電擊穿的影響小，對熱擊穿和電化學擊穿的影響大；電場局部不均勻性對熱擊穿的影響小，對其他兩種影響大。

熱擊穿

當固體電介質(zhì)承受電壓作用時，介質(zhì)損耗是電介質(zhì)發(fā)熱、溫度升高；而電介質(zhì)的電阻具有負溫度系數(shù)，所以電流進一步增大，損耗發(fā)熱也隨之增加。電解質(zhì)的熱擊穿是由電介質(zhì)內(nèi)部的熱不平衡過程造成的。如果發(fā)熱量大于散熱量，電介質(zhì)溫度就會不斷上升，形成惡性循環(huán)，引起電介質(zhì)分解、炭化等，電氣強度下降，zui終導致?lián)舸?/span>

熱擊穿的特點是：擊穿電壓隨溫度的升高而下降，擊穿電壓與散熱條件有關，如電介質(zhì)厚度大，則散熱困難，因此擊穿電壓并不隨電介質(zhì)厚度成正比增加；當外施電壓頻率增高時，擊穿電壓將下降。

電化學擊穿

固體電介質(zhì)受到電、熱、化學和機械力的長期作用時，其物理和化學性能會發(fā)生不可逆的老化，擊穿電壓逐漸下降，長時間擊穿電壓常常只有短時擊穿電壓的幾分之一，這種絕緣擊穿成為電化學擊穿。

液體電介質(zhì)擊穿

純凈液體電介質(zhì)與含雜質(zhì)的工程液體電介質(zhì)的擊穿機理不同。對前者主要有電擊穿理論和氣泡擊穿理論，對后者有氣體橋擊穿理論。沿液體和固體電介質(zhì)分界面的放電現(xiàn)象稱為液體電介質(zhì)中的沿面放電。這種放電不僅使液體變質(zhì)，而且放電產(chǎn)生的熱作用和劇烈的壓力變化可能使固體介質(zhì)內(nèi)產(chǎn)生氣泡。經(jīng)多次作用會使固體介質(zhì)出現(xiàn)分層、開裂現(xiàn)象，放電有可能在固體介質(zhì)內(nèi)發(fā)展，絕緣結(jié)構的擊穿電壓因此下降。脈沖電壓下液體電介質(zhì)擊穿時，常出現(xiàn)強力氣體沖擊波（即電水錘），可用于水下探礦、橋墩探傷及人體內(nèi)臟結(jié)石的體外破碎。

氣體電介質(zhì)擊穿

在電場作用下氣體分子發(fā)生碰撞電離而導致電極間的貫穿性放電。其影響因素很多，主要有作用電壓、電板形狀、氣體的性質(zhì)及狀態(tài)等。氣體介質(zhì)擊穿常見的有直流電壓擊穿、工頻電壓擊穿、高氣壓電擊穿、沖擊電壓擊穿、高真空電擊穿、負電性氣體擊穿等?？諝馐呛芎玫臍怏w絕緣材料，電離場強和擊穿場強高，擊穿后能迅速恢復絕緣性能，且不燃、不爆、不老化、無腐蝕性，因而得到廣泛應用。為提供高電壓輸電線或變電所的空氣間隙距離的設計依據(jù)（高壓輸電線應離地面多高等），需進行長空氣間隙的工頻擊穿試驗。

High breakdown voltage breakdown strength of solid form?
Dielectric breakdown
Solid dielectric breakdown leads to the lowest critical breakdown voltage is called breakdown voltage. In a uniform electric field, breakdown voltage and dielectric thickness is called breakdown field strength (the breakdown strength, and dielectric strength). It reflects the dielectric strength of solid dielectrics. Not in uniform electric field, breakdown voltage and breakdown at the medium thickness ratio as it is below the average breakdown strength, dielectric strength of the solid medium in a uniform electric field. Solid dielectric breakdown, due to a huge current through, there will be melted or charred in the medium channel, or cracks. Brittle dielectric breakdown often occurs, materials can be broken, broken non metallic ore.
Solid dielectric breakdown
Solid dielectric breakdown has 3 forms: breakdown, thermal breakdown and electrochemical breakdown.
Breakdown
Breakdown is due to electric field to charged particle dielectric accumulated enough quantity and energy due to the dielectric lose insulation performance. The thermal breakdown is due in the electric field, the heat inside dielectric accumulation, high temperature caused loss of insulating ability. The electrochemical breakdown is factors in the role of the electric field, temperature, dielectric chemical changes occur slowly, the performance gradually degrades, eventually lose the insulating ability. The chemical changes of solid dielectrics usually make the conductance increase, which makes up the medium temperature, so the final form of the electrochemical breakdown is thermal breakdown. Effect of time on the effect of temperature and voltage breakdown, influence on thermal breakdown and electrochemical breakdown; local field inhomogeneities on the thermal breakdown of the impact of small, on the other two kinds of influence.
Thermal breakdown
When the solid dielectric withstand voltage effect, the dielectric loss is increased and the dielectric heating, temperature; dielectric resistance with negative temperature coefficient, so the current is further increased, heat loss also increases. The thermal breakdown of electrolyte is a dielectric internal thermal imbalance caused by the process. If the heat is greater than the quantity of heat, the dielectric temperature will continue to rise, forming a vicious spiral, caused by dielectric decomposition, carbonization, electrical breakdown strength decreased, resulting in.
The characteristics of thermal breakdown is: breakdown voltage decreased with the increase of temperature, breakdown voltage and heat dissipation conditions, such as the thickness of the dielectric, difficult heat dissipation, so the breakdown voltage does not with the dielectric thickness is proportional to the increase; when the applied voltage frequency increased, breakdown voltage will drop.
Electrochemical breakdown
Solid dielectric is the long-term effects of electrical, thermal, chemical and mechanical force, and their physical and chemical properties will irreversibly aging, breakdown voltage decreased gradually, breakdown voltage for a long time often only a fraction of the short-time breakdown voltage, the insulation breakdown as electrochemical breakdown.
Liquid dielectric breakdown
The breakdown mechanism of pure liquid dielectrics is different from that of the engineering liquid dielectrics containing impurities. The former is mainly about the theory of electric breakdown and bubble breakdown, and the latter has the theory of gas bridge breakdown. The discharge of liquid and solid dielectric interface is called liquid dielectric surface discharge. This discharge not only causes the liquid to degenerate, but also the heat generated by the discharge and the intense pressure change may cause the bubble in the solid medium. After many functions, the solid media can be layered and cracked, and the discharge is likely to develop in the solid medium, and the breakdown voltage of the insulation structure is decreased. When the liquid dielectric breakdown under the impulse voltage, the strong gas shock wave (namely the electric water hammer), can be used for underwater exploration, bridge pier flaw detection and the body's internal organs stones in vitro broken.
Gas dielectric breakdown
Through the electric field, the gas molecules collide with the ionization, which leads to the penetration of the electrodes. It has many influencing factors, mainly by the voltage, electrode shape, gas properties and etc.. Gas dielectric breakdown in common with DC breakdown voltage, power frequency breakdown voltage, high pressure electric breakdown, impulse voltage breakdown, high vacuum shock, wear breakdown in electronegative gases. Air is a good gas insulation material, ionization and breakdown field strength high, after the breakdown can quickly restore the insulation performance, and non flammable, non explosive, non aging, non corrosive, and thus widely used. In order to provide the design basis for the air gap distance between the high voltage transmission line and the substation (high voltage transmission line should be high), the power frequency breakdown test of long air gap is required.

關于設備論述

       在強電場作用下，固體電介質(zhì)喪失電絕緣能力而由絕緣狀態(tài)突變?yōu)榱紝щ姞顟B(tài)。導致?lián)舸┑膠ui低臨界電壓稱為擊穿電壓。均勻電場中，擊穿電壓與固體電介質(zhì)厚度之比稱為擊穿電場強度（簡稱擊穿場強，又稱介電強度），它反映固體電介質(zhì)自身的耐電強度。不均勻電場中，擊穿電壓與擊穿處固體電介質(zhì)厚度之比稱為平均擊穿場強，它低于均勻電場中固體電介質(zhì)的介電強度。固體電介質(zhì)發(fā)生擊穿后,由于有巨大的電流通過,電介質(zhì)中會出現(xiàn)熔化或燒焦的通道，或出現(xiàn)機械損傷的裂紋。固體電介質(zhì)的這些變化是不可逆的，不能自己恢復原來的絕緣性能。脆性固體電介質(zhì)擊穿時，常發(fā)生材料的碎裂，故可用擊穿效應來破碎非金屬礦石等。
 

　　 擊穿形式　根據(jù)擊穿的發(fā)展過程，固體電介質(zhì)的擊穿可分為3種形式:電擊穿、熱擊穿和電化學擊穿。它們的一般特征如表所示。同一種電介質(zhì)中發(fā)生何種形式的擊穿，取決于不同的外界因素。隨著擊穿過程中固體電介質(zhì)內(nèi)部的變化，擊穿過程可以從一種形式轉(zhuǎn)變?yōu)榱硪环N形式?！?    電擊穿 　取決于固體電介質(zhì)中碰撞電離的一種擊穿形式。電場使電介質(zhì)中積聚起足夠數(shù)量和足夠能量的帶電質(zhì)點，導致電介質(zhì)喪失絕緣性能。對于電擊穿有以下幾種不同的理論解釋：本征擊穿、電子崩擊穿和電致機械應力擊穿，通常以本征擊穿代表電擊穿，所以電擊穿有時又稱本征擊穿。本征擊穿過程所需時間為10-8s數(shù)量級，擊穿場強大于1MV/cm。
 

　　固體電介質(zhì)內(nèi)總會存在少量自由傳導(處于導帶的)電子。在電場作用下，它們會從電場獲取能量。單位時間內(nèi)這些電子取得的能量A與電場強度E、電子本身能量W、點格溫度T有關。另一方面，傳導電子也將因與固體電介質(zhì)點格發(fā)生碰撞而失去一部分能量。單位時間內(nèi)傳導電子失去的能量B與W和T有關。當點格溫度T為定值時，A、B與W的關系如圖1所示。圖中E2>EC>E1。當外加電場為E2>EC時,因一部分傳導電子的能量處于W2～WC之間，單位時間內(nèi)這些電子獲得的能量A始終大于失去的能量B，電子被加速，碰撞點格時產(chǎn)生電離,使處于導帶的電子不斷增加，電流急劇上升,zui終導致固體電介質(zhì)擊穿。當外加電場為E1EC時,雖然偶而會有能量大于W1的電子出現(xiàn),且因此時A>B而使點格發(fā)生碰撞電離、產(chǎn)生新的傳導電子；但因電子能量大于W1的概率很低,所以傳導電子不斷增多的過程很難出現(xiàn),固體電介質(zhì)不會擊穿。處于臨界狀態(tài)的EC即為固體電介質(zhì)的介電強度。
 

　　熱擊穿在電場作用下，固體電介質(zhì)承受的電場強度雖不足以發(fā)生電擊穿，但因電介質(zhì)內(nèi)部熱量積累、溫度過高而導致失去絕緣能力，從而由絕緣狀態(tài)突變?yōu)榱紝щ姞顟B(tài)。
 

　　固體電介質(zhì)在電場作用下將因電導和極化損耗而發(fā)熱。單位時間內(nèi)固體電介質(zhì)的發(fā)熱量A與作用電壓U、介質(zhì)溫度t有關。另一方面固體電介質(zhì)也將向四周散發(fā)熱量。單位時間內(nèi)固體電介質(zhì)的散熱量B與(t-t0)有關(t0為環(huán)境溫度)。A、B與t的關系如圖2所示。圖中U2>UC>U1。當外加電壓U2>UC時，固體電介質(zhì)中的發(fā)熱量A大于散熱量B，介質(zhì)溫度上升,且因A始終大于B,所以固體電介質(zhì)的溫度不斷上升，zui終介質(zhì)被燒焦、燒熔或燒裂，喪失絕緣性能，發(fā)生熱擊穿。當外加電壓U1UC時,雖然開始時A>B,固體電介質(zhì)溫度上升;但當溫度升到t1時，發(fā)熱量A與散熱量B相等，建立起了熱平衡。此時,若介質(zhì)能耐受溫度t1的作用,則固體電介質(zhì)能正常工作,不會發(fā)生熱擊穿。當外加電壓等于UC時,當介質(zhì)溫度升到t2時，建立起了熱平衡，但不穩(wěn)定。溫度略有升高,發(fā)熱量A即大于散熱量B,zui終仍然發(fā)生熱擊穿。電壓UC是發(fā)生熱擊穿的臨界電壓。
 

　　電化學擊穿 　在電場、溫度等因素作用下，固體電介質(zhì)發(fā)生緩慢的化學變化，性能逐漸劣化，zui終喪失絕緣能力，從而由絕緣狀態(tài)突變?yōu)榱紝щ姞顟B(tài)。電化學擊穿過程包括兩部分：因固體電介質(zhì)發(fā)生化學變化而引起的電介質(zhì)老化；與老化有關的擊穿過程。
 

　　固體電介質(zhì)發(fā)生緩慢化學變化的原因多種多樣。直流電壓下，固體電介質(zhì)因離子電導而發(fā)生電解，結(jié)果在電極附近形成導電的金屬樹枝狀物，甚至從一個電極伸展到另一個電極。在電場作用下，固體電介質(zhì)內(nèi)部的氣泡中，或不同固體電介質(zhì)之間的氣隙或油隙中，會發(fā)生局部放電。與固體電介質(zhì)接觸的電極邊緣場強較強的局部區(qū)域內(nèi)如有氣體或液體電介質(zhì)，這里也會發(fā)生局部放電。局部放電的長期作用會使固體電介質(zhì)逐步損壞?？諝庵械姆烹妼⑿纬沙粞?、氮的氧化物等化學性質(zhì)活潑的物質(zhì)，它們會使固體電介質(zhì)發(fā)生化學變化。對有機固體電介質(zhì)，在電極上*處或微小空氣隙處，會發(fā)生樹枝狀放電，并留下炭化痕跡。
 

　　電場越強，溫度越高，電壓作用時間越長，固體電介質(zhì)的化學變化進行得越強烈，其性能的劣化也越嚴重。
 

　　固體電介質(zhì)的化學變化通常使其電導增加，這會使固體電介質(zhì)的溫度上升，因而電化學擊穿的zui終形式是熱擊穿。
 

　　影響因素 　影響固體電介質(zhì)擊穿電壓的主要因素有：電場的不均勻程度，作用電壓的種類及施加的時間，溫度，固體電介質(zhì)性能、結(jié)構，電壓作用次數(shù)，機械負荷，受潮等。
 

　?、匐妶龅牟痪鶆虺潭龋壕鶆?、致密的固體電介質(zhì)在均勻電場中的擊穿場強可達1～10MV/cm。擊穿場強決定于物質(zhì)的內(nèi)部結(jié)構，與外界因素的關系較小。當電介質(zhì)厚度增加時，由于電介質(zhì)本身的不均勻性，擊穿場強會下降。當厚度極小時 (-3～10-4cm)，擊穿場強又會增加。電場越不均勻，擊穿場強下降越多。電場局部加強處容易產(chǎn)生局部放電，在局部放電的長時間作用下，固體電介質(zhì)將產(chǎn)生化學擊穿。
 

　?、谧饔秒妷簳r間、種類：固體電介質(zhì)的三種擊穿形式與電壓作用時間有密切關系 （圖3）。同一種固體電介質(zhì)，在相同電場分布下，其雷電沖擊擊穿電壓通常大于工頻擊穿電壓，且直流擊穿電壓也大于工頻擊穿電壓。交流電壓頻率增高時，由于局部放電更強，介質(zhì)損耗更大，發(fā)熱嚴重，更易發(fā)生熱擊穿或?qū)е禄瘜W擊穿提前到來。
 

　?、蹨囟龋寒敎囟容^低，處于電擊穿范圍內(nèi)時，固體電介質(zhì)的擊穿場強與溫度基本無關。當溫度稍高，固體電介質(zhì)可能發(fā)生熱擊穿。周圍溫度越高，散熱條件越差，熱擊穿電壓就越低。
 

　　④固體電介質(zhì)性能、結(jié)構：工程用固體電介質(zhì)往往不很均勻、致密，其中的氣孔或其他缺陷會使電場畸變，損害固體電介質(zhì)。電介質(zhì)厚度過大，會使電場分布不均勻，散熱不易，降低擊穿場強。固體電介質(zhì)本身的導熱性好，電導率或介質(zhì)損耗小，則熱擊穿電壓會提高。
 

　?、蓦妷鹤饔么螖?shù)：當電壓作用時間不夠長，或電場強度不夠高時,電介質(zhì)中可能來不及發(fā)生*擊穿,而只發(fā)生不*擊穿。這種現(xiàn)象在極不均勻電場中和雷電沖擊電壓作用下特別顯著。在電壓的多次作用下，一系列的不*擊穿將導致介質(zhì)的*擊穿。由不*擊穿導致固體電介質(zhì)性能劣化而積累起來的效應稱為累積效應。
 

　?、迿C械負荷：固體電介質(zhì)承受機械負荷時，若材料開裂或出現(xiàn)微觀裂縫，擊穿電壓將下降。
 

　?、呤艹保汗腆w電介質(zhì)受潮后，擊穿電壓將下降。
 

　　提高擊穿電壓措施　根據(jù)固體電介質(zhì)的擊穿形式及影響擊穿電壓的因素，提高固體電介質(zhì)擊穿電壓的主要措施有:①改善電場分布（見電場調(diào)整）,如電極邊緣的固體電介質(zhì)表面涂半導電漆；②調(diào)整多層絕緣中各層電介質(zhì)所承受的電壓；③對多孔性、纖維性材料經(jīng)干燥后浸油、浸漆,以防止吸潮,提高局部放電起始電壓；④加強冷卻，提高熱擊穿電壓；⑤改善環(huán)境條件，防止高溫，避免潮氣、臭氧等有害物質(zhì)的侵蝕。

Discussion on electrical breakdown strength instrument and insulation dielectric strength equipment
Under the action of the strong electric field, the solid dielectric loss of electric insulation ability and the insulation state is a good state. The lowest critical voltage that causes breakdown is called the breakdown voltage. In a uniform electric field, the ratio of the breakdown voltage to the solid dielectric thickness is called the breakdown field strength (short for the breakdown field strength, and the dielectric strength), which reflects the strength of the solid dielectric. In the nonuniform electric field, the ratio of the breakdown voltage to the solid dielectric thickness is called the average breakdown field strength, which is lower than the dielectric strength of the solid dielectric in the uniform electric field. After the breakdown of the solid dielectric, because there is a huge current through, the dielectric will appear in the melting or burning of the channel, or the occurrence of mechanical damage crack. These changes in solid dielectrics are irreversible and cannot restore their original insulating properties. Brittle solid dielectric breakdown, often occurs when the material is broken, it can be used to break the effect of the breakdown of non-metallic minerals, etc..
Breakdown form according to the breakdown of the development process, the breakdown of solid dielectrics can be divided into 3 forms: breakdown, thermal breakdown and electrochemical breakdown. Their general characteristics are shown in the table. What kind of breakdown occurs in the same kind of dielectric depends on the different external factors. Breakdown process can be changed from one form to another with the change of the solid dielectric in the breakdown process. Electrical breakdown depends on a breakdown of the ionization of the solid medium. Electric field causes the dielectric medium to accumulate enough quantity and enough energy of charged particle, which leads to the loss of dielectric properties. For electrical breakdown, there are several different theories to explain: the intrinsic breakdown, the breakdown of the electron avalanche and the breakdown of the mechanical stress, usually by the breakdown of the breakdown on behalf of the electrical breakdown, so the breakdown is sometimes called the breakdown. The intrinsic breakdown time required to process the order of 10-8s, the breakdown strength of more than 1MV/cm.
There will always be a small amount of solid dielectrics in free transmission (in the electronic conduction band). In the electric field, they gain energy from the electric field. A associated with the electric field strength of E and W, lattice energy electron temperature T the electronic energy per unit time. On the other hand, will also be a result of conduction electrons and solid dielectric lattice collision and lose a part of energy. B and W and T of energy per unit time of conduction electrons lost. When the lattice temperature of T is constant, as shown in Figure 1 the relationship between A, B and W. Figure E2>EC>E1. When the applied electric field is E2>EC, due to a part of the conduction electron energy in W2 ~ WC, in unit time access to the electronic energy a always greater than the energy lost B, electrons are accelerated, the collision point lattice produce ionization, so that in the electrons in the conduction band of the increasing, a sharp rise in current, eventually leading to breakdown in solid dielectrics. When the applied electric field is E1EC, although occasionally have energies greater than the electronic W1, and because of this A>B the lattice collision ionization, and produced new conduction electrons; but for electron energies greater than W1 probability is very low, so increasing electronic conduction process is difficult to appear, solid dielectric does not breakdown. In the critical state of the EC is the dielectric strength of solid dielectrics.
Thermal breakdown under the action of electric field, electric field strength of solid dielectric withstand although not enough to electrical breakdown, but due to the dielectric, the internal heat accumulation, the temperature is too high and lead to loss of insulating ability, thus by the insulation state of mutation as a conducting state.
Solid dielectric in the electric field due to the conductivity and polarization loss and fever. Solid dielectric in unit time the calorific value of A and the role of U, the temperature of the medium voltage t. On the other hand, solid dielectric will emit heat to the surrounding. And the amount of heat dissipation of B solid dielectric in unit time (t-t0) (t0 is about ambient temperature). The relationship between A, B and t as shown in figure 2. Figure U2>UC>U1. When the applied voltage U2>UC, solid dielectric in the calorific value of a greater than heat dissipation B, medium temperature rise and because a is always greater than B, therefore increasing the temperature of solid dielectrics, final medium charred, fusing or burned bifida, loss of insulating properties, thermal breakdown. When the applied voltage is U1UC, although at the beginning of A>B, the temperature rise of solid dielectrics; but when the temperature rises to T1, heat A and heat dissipation is equal to B, set up the heat balance. At this time, if the media can tolerate the temperature of T1, while the solid dielectric can work normally, no thermal breakdown. When the applied voltage is equal to UC, when the medium temperature rises to T2, the establishment of heat balance, but not stable. The temperature increased slightly, calorific value A is greater than the heat dissipating capacity of B, eventually still thermal breakdown. Voltage UC is the thermal breakdown of the critical voltage.
The electrochemical breakdown factors in the role of the electric field, temperature, solid dielectric chemical changes occur slowly, the performance gradually degrades, eventually lose the insulation ability, thus mutation from an insulating state as a conducting state. Electrochemical breakdown process includes two parts: for solid dielectric chemical changes caused by aging and aging of dielectric breakdown process related.
Solid dielectric occurred in a variety of reasons of slow chemical change diversity. Under DC voltage, ionic conductivity and solid dielectrics due to electrolysis, results in the formation of a branch of the conductive metal near the electrode, even extending from one electrode to the other electrode. In the electric field, solid dielectric inside the bubble, the air gap or the oil gap between different or solid dielectrics, partial discharge will occur. Contact with the solid electrolyte electrode edge field strong local area such as a gas or liquid dielectric, here will be

客戶關注產(chǎn)品:

ZJC-50KV/符合國標GB/T1408-2006、ASTM D149

ZST-121體積表面電阻率測試儀/符合國標GB/T1410-2006、ASTM D257-99

ZJD-B介電常數(shù)介質(zhì)損耗測試儀/符合國標GB/T1409-2006

QYH-96塑料球壓痕硬度測試儀/符合國標GB/T3398-2008

M-200橡膠塑料摩擦磨損試驗機/符合國標GB/T3960-1983

XRW-300HA熱變形維卡溫度測定儀/符合國標GB/T8802-2001

XNR-400A熔體流動速率測定儀/符合國標GB/T3682-2000

CZF-5水平垂直燃燒試驗儀/符合國標GBGB/T5169.16-2002 、ANSI/UL94

JF-3氧指數(shù)測定儀GB/T 2406.2-2009 GB/T 2406.1-2008

DJC-1型單根電線電纜垂直燃燒試驗機符合國標GB/T18380.11-2008

DW-02點著溫度測定儀符合國標GB4610-84

LDQ-2漏電起痕試驗儀符合國標UL746A、ASTM D 3638-92

PMSC-3塑料泡沫水平垂直燃燒試驗儀符合國標GB/T8333-2008

QSC-2汽車內(nèi)飾材料燃燒試驗儀符合國標GB8410-2006

XGB-10B管材靜液壓試驗機 符合標準GB/T6111、GB/T15560

XHG-20 管材環(huán)剛度試驗機符合標準GB/T 9647

WZY-240型萬能制樣機符合國標GB/T1043

XQZH-1缺口制樣機符合標準GB/T1043

XYZ-12啞鈴制樣機符合標準GB/T1040

Customer focus on product:
ZJC-50KV voltage breakdown tester / in line with the national standard ASTM, D149 GB/T1408-2006
ZST-121 volume surface resistivity tester / ASTM, D257-99 GB/T1410-2006
ZJD-B dielectric constant dielectric loss tester / in line with the national standard GB/T1409-2006
QYH-96 plastic ball indentation hardness tester / in line with the national standard GB/T3398-2008
M-200 rubber plastic friction and wear testing machine / in line with the national standard GB/T3960-1983
XRW-300HA thermal deformation VEKA temperature meter / accord with national standard GB/T8802-2001
XNR-400A melt flow rate meter / in line with the national standard GB/T3682-2000
CZF-5 horizontal vertical burning tester / in line with the national standard GBGB/T5169.16-2002, ANSI/UL94
JF-3 oxygen index measuring instrument 2406.2-2009 GB/T 2406.1-2008 GB/T
DJC-1 type single cable vertical burning test machine in accordance with the national standard GB/T18380.11-2008
DW-02 point of the temperature measuring instrument in line with the national standard GB4610-84
LDQ-2 tracking tester, ASTM D meet UL746A 3638-92
PMSC-3 plastic foam horizontal vertical combustion test instrument in line with the national standard GB/T8333-2008
QSC-2 automotive interior material combustion test instrument in line with the national standard GB8410-2006
XGB-10B pipe hydrostatic testing machine according to the standards of GB/T6111 and GB/T15560
XHG-20 pipe ring stiffness testing machine in line with the standard GB/T 9647
WZY-240 type universal system prototype conforms to the national standard GB/T1043
XQZH-1 notch prototype meets the standard GB/T1043
XYZ-12 dumbbell prototype is in line with the standard GB/T1040

售后服務承諾書

  1. 我公司在交付合同中的產(chǎn)品在辦理運輸時，均已辦理保險。因運輸過程中引起產(chǎn)品質(zhì)量問題的應由本公司負責維修或調(diào)換，費用由本公司承擔；但需方必須配合供方取得運輸過程中儀器損壞的證明文件，以便供方向保險公司進索賠事宜。

  2. 我公司銷售給各客戶的產(chǎn)品均實行保修一年，終身維護產(chǎn)品服務（人為因素或不可抗拒的自然現(xiàn)象所引起的故障或破壞除外）。免費保修期為購貨日起一年內(nèi)，在保修期內(nèi)，無償更換由于原材料缺陷及制造工藝等問題所發(fā)生損壞的相應部件；一年以后，儀器出現(xiàn)損壞時，我公司只收取零部件的成本費。

  3. 高度重視用戶對我公司產(chǎn)品質(zhì)量反饋的意見，無論來人、來電、來函、在24小時內(nèi)作出處理意見。并立即通知用戶。

 4 .我公司在儀器售出一次性免費培訓購方操作人員，使受訓人員了解設備的工作原理、操作規(guī)程、以及維護、保養(yǎng)方法。

5. 我公司建立了顧客檔案，以便定期進行服務跟蹤和質(zhì)量跟蹤。

6. 公司將定期派出反饋員到顧客單位征求意見，檢查設備運行情況，確保設備正常運行。

7. 在保修期內(nèi)，以下情況將實行有償維修服務，

（1）由于人為或不可抗拒的自然現(xiàn)象而發(fā)生的損害

（2）由于操作不當而造成的故障或損壞

（3）由于對產(chǎn)品不正確的安裝，經(jīng)他人維修而損壞

   以上是我公司對顧客的服務承諾，也是全體市場營銷、售后服務人員的工作準則，懇請顧客監(jiān)督實施。

After-sales service commitment
1 my company specified in the delivery of the contract products in in the process of transportation, has been handling the insurance. Due to the transport process caused by product quality shall be borne by the company responsible for the repair or replacement, the cost borne by the company; but the buyer must cooperate with the suppliers obtain transit instrument damage documentation for the insurance company claims matters.
. my company sells products to the customers are implemented for one year warranty, life-long maintenance products and services (human factors or irresistible natural phenomenon caused by the fault or failure except). Free warranty period to purchase within one year from the date, in the warranty period, free replacement due to a problem with the raw material defects and manufacturing processes, the damage to the corresponding parts; a year later, equipment damage, we only charge the cost of the components.
. attach great importance to the user of our company product quality feedback opinion, whether to, call us, us, within 24 hours made treatment advice. And immediay notify the user.
. our company in the instrument sold one-time free training purchase operation personnel, trained staff to understand the equipment working principle, operation rules and maintenance, maintenance methods.
Our company has established 5 customer files, to carry out regular service tracking and quality tracking.
6 the company will periodically send feedback to the customer unit for advice, check the operation condition of equipment to ensure the normal operation of equipment.
7 in the warranty period, the situation will be paid maintenance services,
(1) due to natural or man-made phenomenon of irresistible damage
(2) due to failure or damage caused by improper operation
(3) products due to improper installation, repair damaged by others
More than company customer service commitment, the implementation guidelines of is all marketing and after-sales service personnel, ask the customer supervision.

典型用戶:

成都電子科技大學

大連理工大學

廣州華南理工大學

上?？臻g電源研究所

上海金由氟材料有限公司

江蘇合成新材料有限公司

中國科學院北京納米能源與系統(tǒng)研究所

中國建材檢驗認證集團有限公司

中國*汽車股份有限公司技術中心

中國航天科技集團烽火機械廠

沈陽化工股份有限公司

江西宏特絕緣材料有限公司

山西省醫(yī)療器械檢測中心

廣東計量測試技術服務中心

北京博華信智科技股份有限公司

德昌電機（深圳）有限公司

康龍化成（北京）新藥技術有限公司

中電科微波通信（上海）股份有限公司

大慶市坤田化工科技有限公司

河北華夏實業(yè)有限公司

湘潭電機股份有限公司

*軍事醫(yī)學科學院試驗儀器廠

重慶中科力泰高分子材料股份有限公司

杭州包爾得有機硅有限公司

江西騰徳實業(yè)有限公司

青島海源通塑料制品廠

西安科技大學

泰安魯怡高分子材料有限公司

Typical user:
Chengdu Electronic Technology University
Dalian University of Technology
South China University of Technology, Guangzhou
Shanghai Space Power Research Institute
Shanghai Jin by Fluorine Material Co., Ltd.
Jiangsu synthetic New Material Co., Ltd.
China Academy of Sciences Beijing Institute of nano energy and systems
China building materials inspection & Certification Group Co., Ltd.
China's first automotive Limited by Share Ltd Technical Center
Chinese Aerospace Science and Technology Corporation Fenghuo Machinery Factory
Shenyang chemical Limited by Share Ltd
Jiangxi Hong te insulation material Co., Ltd.
Shanxi medical device testing center
Guangdong measuring and Testing Technology Service Center
Beijing Bohua letter chi Polytron Technologies Inc
Dechang electric machine (Shenzhen) Co., Ltd.
Kanglong chemical (Beijing) new drug Technology Co., Ltd.
Division of microwave communication (Shanghai) Limited by Share Ltd
Daqing City Kun Tian Chemical Technology Co., Ltd.
Hebei Huaxia Industrial Co., Ltd.
Xiangtan electric motor Limited by Share Ltd
The Chinese people's Liberation Army Military Medical Science Academy of the PLA test instrument factory
Chongqing thmisco polymer materials Limited by Share Ltd
Hangzhou bao'erde organosilicon Co., Ltd.
Jiangxi Teng de Industrial Co. Ltd.
Qingdao Haiyuan plastic products factory
Xi'an University of Science and Technology
Tai'an Lu Yi macromolecule material Co., Ltd.