变压器油常见质量问题探讨! - 山东变压器油哪家好

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变压器油常见质量问题探讨!

发布时间2019-07-30  来源:http://www.wunqdctk.com

  绝缘油的击穿电压是多少?
  What is the breakdown voltage of insulating oil?
  击穿电压也是评价绝缘油电气性能的一项指标,可用于判断绝缘油的水等悬浮物污染程度,并可在注油前检查油的干燥和过滤程度。
  Breakdown voltage is also an index to evaluate the electrical performance of insulating oil. It can be used to judge the pollution degree of suspended solids such as water in insulating oil, and check the drying and filtering degree of oil before oil injection.
  当一个逐渐增加的电压被施加到一个干净的,干燥的油,电子发射在电压的负极值,当电子足够的能量,油分子是微化和离解。
  When an increasing voltage is applied to a clean, dry oil, the electrons are emitted at the negative extremum of the voltage, and when the electrons have enough energy, the oil molecules are micronized and dissociated.
  因此,整个离解过程随着电压的增加而增强。当达到一定电压时,会产生大量的导电电流形成电弧。这种现象称为击穿,击穿时的电压称为击穿电压。
  Therefore, the whole dissociation process increases with the increase of voltage. When a certain voltage is reached, a large amount of conductive current will be generated to form an arc. This phenomenon is called breakdown, and the breakdown voltage is called breakdown voltage.
  如果油中有水或固体,击穿电压会降低,因为水和固体的电导率比油大。运行中油的击穿电压是变压器发生危险的信号。
  If there is water or solid in the oil, the breakdown voltage will decrease because the conductivity of water and solid is higher than that of oil. The breakdown voltage of oil in operation is a dangerous signal of transformer.
  根据国内外变压器油标准,击穿电压一般为40 ~ 50kV,高压一般为60kV以上。
  According to the standard of transformer oil at home and abroad, the breakdown voltage is generally 40 ~ 50 kV, and the high voltage is generally more than 60 kV.
  电容是什么?
  What is capacitance?
  介电常数,也称为介电常数(或相对介电常数),是指电容器的两个电极之间和周围充满绝缘油时,电容器的电容与同一板的真空电容之比。
  Dielectric constant, also known as dielectric constant (or relative dielectric constant), refers to the ratio of capacitance of capacitor to vacuum capacitance of the same plate when the insulating oil is filled between and around the two electrodes of capacitor.
  不同的绝缘油具有不同的介电常数,通常随温度和频率而变化。在实际应用中,电容油的介电常数随温度和频率的变化要求越小越好。
  Different insulating oils have different dielectric constants, which usually vary with temperature and frequency. In practical application, the smaller the change of dielectric constant of capacitor oil with temperature and frequency, the better.
  如果电容器的电容变化较大,失去了安全感,应采取相应的措施。
  If the capacitance of the capacitor changes greatly and the sense of safety is lost, corresponding measures should be taken.
  绝缘油的介电损耗系数是多少?
  What is the dielectric loss coefficient of insulating oil?
  绝缘油的介电损耗系数用介电损耗角的正切值表示,该正切值是外加交流电压与通过绝缘油的电流之间的相角和补角。
  The dielectric loss coefficient of the insulating oil is expressed by the tangent value of the dielectric loss angle, which is the angle between the applied AC voltage and the current passing through the insulating oil.
  变压器油是变压器或类似设备的绝缘介质。在交流电路产生的电场变化作用下,理论上只会通过介质中微弱的电容电流。
  Transformer oil is the insulation medium of transformer or similar equipment. Under the action of electric field change produced by alternating current circuit, only weak capacitive current in medium can be passed theoretically.
山东变压器油
  它超前于所施加的电压相90℃,属于无功电流,只影响设备的功率因数,不会产生功率损耗,但实际上油中会有或多或少的能量。
  It is ahead of the applied voltage phase of 90 C and belongs to reactive current. It only affects the power factor of the equipment and does not produce power loss, but in fact there will be more or less energy in the oil.
  一种极性分子,它能引起内部电荷不平衡,或由充当导体的电场引起,产生电阻性导电电流(或泄漏电流)。
  A polar molecule that causes an internal charge imbalance, or is caused by an electric field acting as a conductor, producing a resistive conductive current (or leakage current).
  与电流和电压同相的还有有功电流、功率损耗,称为绝缘油的介电损耗,与导电电流和电容电流之比(Jian),称为介电损耗因子。
  In the same phase with current and voltage, there are active current and power loss, which is called dielectric loss of insulating oil, and the ratio of conductive current to capacitive current (Jian), which is called dielectric loss factor.
  绝缘损耗系数是评价绝缘油电气性能的重要指标,特别是绝缘油的劣化或污染对绝缘油绝缘损耗系数的变化更为明显。
  Insulation loss coefficient is an important index to evaluate the electrical performance of insulating oil, especially the deterioration or pollution of insulating oil has more obvious effect on the change of insulation loss coefficient of insulating oil.
  新油中极性物质较少,介电损耗系数一般为0。在0001和0.001之间。操作油介质损耗系数过大,无法采取处理措施。
  There are few polar substances in the new oil, and the dielectric loss coefficient is generally 0. Between 0001 and 0.001. Operating oil medium loss coefficient is too large to take treatment measures.
  变压器油界面张力的变化说明了什么?
  What does the change of interfacial tension of transformer oil explain?
  (1)界面张力是指绝缘油与不溶性水之间的张力;
  (1) The interfacial tension refers to the tension between insulating oil and insoluble water.
  (2)油品由于老化后使用氧化产物、污泥等会对界面张力产生影响。
  (2) The interfacial tension of oil products will be affected by the use of oxidation products and sludge after aging.
  (3)使用变压器油界面张力一般可达40—50mN/m,油老化后,由于形成多种有机酸(COOH)和醇(OH)等极性物质,使油界面张力逐渐降低。
  (3) The interfacial tension of transformer oil can generally reach 40-50 mN/m. After oil aging, the interfacial tension of transformer oil decreases gradually due to the formation of various polar substances such as organic acids (COOH) and alcohols (OH).
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