CN103454536A - Power transformer test method - Google Patents
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Abstract
Description
技术领域 technical field
本发明涉及一种对电力变压器定检或预防性试验时的试验方法。 The invention relates to a test method for regular inspection or preventive test of power transformers.
背景技术 Background technique
目前，在电力系统中，在对变压器无论是定检或预防性试验时，通常的做法是把变压器(双圈或三圈)各侧与母线或一次设备相连的引线拆除，然后再对变压器本身按常规进行试验。这种把引线拆掉再对变压器试验的传统方法存在如下几个缺点：1、拆、装引线时，工作人员需登高作业，特别是220kV、500kV及以上的变压器，套管顶端离地平面有十几米甚至二十几米，人登高拆、装引线时，就存在着工作人员高空跌落的危险；2、拆、装引线，将耗费大量的物力：需购置昂贵的高空作业车、斗臂车和其它保证安全的工器具，同时又费工、费时，根据以往的经历，光是拆、装引线所耗去的时间，就占整个停电时间的1/3；3、拆、装引线时，容易造成设备线夹断裂、损坏；4、装引线时，如处理不当，易造成引线的设备线夹与套管的导电杆接触不良产生过热。 At present, in the power system, whether it is a regular inspection or a preventive test of the transformer, the usual practice is to remove the lead wires connected to the busbar or primary equipment on each side of the transformer (double-turn or three-turn), and then perform a test on the transformer itself. Test as usual. This traditional method of removing the lead wires and then testing the transformer has the following disadvantages: 1. When removing and installing the lead wires, the staff needs to climb up to work, especially for transformers of 220kV, 500kV and above, the top of the bushing is far from the ground plane. Tens of meters or even twenty meters, there is a danger of staff falling from high altitude when people climb to dismantle and install the lead wire; Other tools to ensure safety are labor-intensive and time-consuming. According to past experience, the time spent on dismantling and installing lead wires alone accounts for 1/3 of the entire power outage time; 3. When dismantling and installing lead wires, it is easy to 4. When the lead wire is installed, if it is not handled properly, it is easy to cause the equipment wire clip of the lead wire to be in poor contact with the conductive rod of the bushing and cause overheating.
发明方法invention method
本发明要解决的技术问题是提供一种对电力变压器定检或预防性试验时的试验方法，这种方法可在不拆引线的情况下对电力变压器定检或预防性试验，并可以有效克服现有技术存在的问题。 The technical problem to be solved by the present invention is to provide a test method for the regular inspection or preventive test of the power transformer. Problems existing in the prior art.
解决本发明问题所采取的技术方案是： The technical solution taken to solve the problem of the present invention is:
变压器投运前在不接各侧引线的情况下测出一组数据作为“原始数据”，接上各侧引线后再测出一组数据作为“基础数据”，每当对此变压器做试验时，在不拆除变压器与其它设备相连的引线的情况下，将得出的试验数据与“基础数据”进行比较； Before the transformer is put into operation, a set of data is measured as "raw data" without connecting the leads on each side, and a set of data is measured after connecting the leads on each side as "basic data". Whenever the transformer is tested , compare the obtained test data with the "basic data" without removing the leads connecting the transformer to other equipment;
首先对己停电做好安全措施的电力变压器，依次拆除各侧的接地线，把各项目试验时的试验引线依次直接接在套管顶部，同时记录好环境温度、湿度及变压器本体温度，具体试验方法步骤是: Firstly, remove the grounding wires on each side of the power transformer for which safety measures have been taken for power outages, and connect the test lead wires for each item test directly to the top of the bushing in turn, and record the ambient temperature, humidity, and transformer body temperature at the same time. The method steps are:
1）变压器铁芯及夹件绝缘测量：将变压器各侧短路接地； 1) Insulation measurement of transformer iron core and clamps: short-circuit and ground each side of the transformer;
2）变压器各绕组连同套管的绝缘电阻：将兆欧表的G端接地，分别将兆欧表的L端与变压器的待测试绕组、铁芯及夹件连接，L端与变压器的待测试绕组之间串联有单向二极管D, L端通过电容C1后接地，所述的单向二极管D的正极与L端连接，将兆欧表的E端与变压器的非待测试绕组连接，所述的待测试绕组分别为高中压绕组、低压绕组、无绕组，分别得到高中压绕组与铁芯对低压绕组的绝缘电阻R1、低压绕组与铁芯对高中压绕组的绝缘电阻R2、铁芯对高中低压绕组的绝缘电阻R3，该测试结果作为“测量数据”中的绝缘电阻值； 2) The insulation resistance of each winding of the transformer and the bushing: ground the G terminal of the megohmmeter, connect the L terminal of the megohmmeter with the winding, iron core and clamp of the transformer respectively, and connect the L terminal with the transformer to be tested A one-way diode D is connected in series between the windings, and the L terminal is grounded after passing through a capacitor C1. The anode of the one-way diode D is connected to the L terminal, and the E terminal of the megohmmeter is connected to the non-tested winding of the transformer. The windings to be tested are high and medium voltage windings, low voltage windings, and no windings, and the insulation resistance R1 of the high and medium voltage windings and the iron core to the low voltage winding, the insulation resistance R2 of the low voltage winding and the iron core to the high and medium voltage windings, and the insulation resistance of the iron core to the high and medium voltage windings are respectively obtained. The insulation resistance R3 of the low-voltage winding, the test result is used as the insulation resistance value in the "measurement data";
3）分析绕组的绝缘电阻值R：将“测量数据”中的绝缘电阻值与“原始数据”中对应的电阻数值比较，当“测量数据”中的绝缘电阻值大于等于“原始数据”对应的绝缘电阻值的1.3倍时，则各绕组间绝缘良好，当“测量数据”中的至少有一组绝缘电阻值小于“原始数据”对应的绝缘电阻值的1.3倍，但大于“原始数据”对应绝缘电阻值时，将其与“基础数据”中绝缘电阻值比较，当“测量数据”中的绝缘电阻值大于等于“基础数据”中对应的绝缘电阻值的0.7倍时，各绕组间绝缘良好，当“测量数据”中的一组或二组绝缘电阻值小于“基础数据”中对应的绝缘电阻值的0.7倍时，进行变压器油试验，以排除变压器存在的隐患，当“测量数据”中的绝缘电阻数值均小于“基础数据”中对应的绝缘电阻值的0.7倍，或“测量数据”中的绝缘电阻值小于等于“原始数据”中对应的绝缘电阻值时，将变压器返厂修理； 3) Analyze the insulation resistance value R of the winding: compare the insulation resistance value in the "measured data" with the corresponding resistance value in the "raw data", when the insulation resistance value in the "measured data" is greater than or equal to the value corresponding to the "raw data" When the insulation resistance value is 1.3 times, the insulation between the windings is good. When at least one group of insulation resistance values in the "measured data" is less than 1.3 times the insulation resistance value corresponding to the "raw data", but greater than the insulation resistance value corresponding to the "raw data" For the resistance value, compare it with the insulation resistance value in the "basic data". When the insulation resistance value in the "measurement data" is greater than or equal to 0.7 times the corresponding insulation resistance value in the "basic data", the insulation between the windings is good. When one or two sets of insulation resistance values in the "measurement data" are less than 0.7 times the corresponding insulation resistance value in the "basic data", carry out the transformer oil test to eliminate hidden dangers in the transformer. When the "measurement data" in When the insulation resistance values are all less than 0.7 times the corresponding insulation resistance value in the "basic data", or the insulation resistance value in the "measurement data" is less than or equal to the corresponding insulation resistance value in the "raw data", return the transformer to the factory for repair;
4）套管连同绕组的泄漏电流测量：测高压侧时，直流高压发生器的高压引线接变压器高压端，非被测绕组接直流高压发生器高压引线的屏蔽端，同理依次类推测出其它绕组的泄漏电流值； 4) Measurement of the leakage current of the bushing and the winding: when measuring the high voltage side, the high voltage lead wire of the DC high voltage generator is connected to the high voltage end of the transformer, and the non-tested winding is connected to the shielding end of the high voltage lead wire of the DC high voltage generator. The leakage current value of the winding;
将测得的绕组泄漏电流与“原始数据”中的绕组泄漏电流比较，当二者的差异量的绝对值小于等于“原始数据”对应泄漏电流的5%时，则泄漏电流在安全范围内，当二者的差异量的绝对值大于“原始数据”对应泄漏电流的的5%时，进行故障排查。 Compare the measured winding leakage current with the winding leakage current in the "raw data", when the absolute value of the difference between the two is less than or equal to 5% of the leakage current corresponding to the "raw data", the leakage current is within the safe range, When the absolute value of the difference between the two is greater than 5% of the leakage current corresponding to the "raw data", perform troubleshooting.
5）套管连同线圈的介损及电容值测量：对于高电压等级的变压器如110kV及以上，在进行套管连同线圈的介损及电容值测量时，将变压器各侧的避雷器拆除；lOkV避雷器从引线拆除，35kV及以上避雷器从避雷器底座与地相短接处拆开； 5) Measurement of the dielectric loss and capacitance of the bushing and coil: For high-voltage transformers such as 110kV and above, when measuring the dielectric loss and capacitance of the bushing and coil, remove the arresters on each side of the transformer; 10kV arresters Remove it from the lead wire, and remove the 35kV and above arrester from the short connection between the arrester base and the ground phase;
套管的介损和电容值测量、绕组变形检定、变比测量、有载开关动作试验、直流电阻测量按现有技术的常规试验方法试验，最后再对变压器进行消磁后工作结束； The dielectric loss and capacitance value measurement of the bushing, the winding deformation verification, the transformation ratio measurement, the on-load switch action test, and the DC resistance measurement are tested according to the conventional test methods of the prior art, and finally the transformer is degaussed and the work is completed;
将“测量数据”中的套管电容量与“原始数据”中的套管的对应的套管电容量比较，当二者的差异量的绝对值小于等于“原始数据”中对应的电容量的5%时，认为套管正常，当二者的差异量大于“原始数据”对应的电容量5%时，进行故障排查。 Compare the bushing capacitance in the "measured data" with the corresponding bushing capacitance in the "raw data", when the absolute value of the difference between the two is less than or equal to the corresponding capacitance in the "raw data" When the value is 5%, it is considered that the bushing is normal. When the difference between the two is greater than 5% of the capacitance corresponding to the "raw data", perform troubleshooting.
进一步，所述兆欧表的额定电流≥0.8mA。 Further, the rated current of the megger is ≥0.8mA.
进一步，所述兆欧表E端输出电压为4000V～6000V。 Further, the output voltage of the terminal E of the megohmmeter is 4000V-6000V.
进一步，所述单向二极管D的正向导通电流≥3A。 Further, the forward conduction current of the unidirectional diode D is ≥3A.
本发明的积极效果是：提出了一套全新的电力变压器的试验方法，根据试验数据进行分析，如无异常即确定变压器运行正常，出现异常时，再与“原始数据”进行比较作进一步分折和判断。本试验方法在对变压器无论是定检或预防性试验时，可不拆变压器各例引线对变压器进行试验，这样既减少了停电时间又节省大量的人力、物力、财力，同时又保证了安全。 The positive effects of the present invention are: a set of brand-new test methods for power transformers is proposed, and the test data is analyzed according to the test data. If there is no abnormality, it is determined that the transformer is operating normally. When an abnormality occurs, it is compared with "original data" for further analysis and judgment. This test method can test the transformer without dismantling the lead wires of the transformer, whether it is a regular inspection or a preventive test, which not only reduces the power failure time, but also saves a lot of manpower, material and financial resources, and at the same time ensures safety.
具体实施方式 Detailed ways
下面结合具体实施例对本发明做进一步的说明。 The present invention will be further described below in conjunction with specific embodiments.
本发明的试验方法的步骤是： The step of test method of the present invention is:
变压器投运前在不接各侧引线的情况下测出一组数据作为“原始数据”，接上各侧引线后再测出一组数据作为“基础数据”，每当对此变压器做试验时，在不拆除变压器与其它设备相连的引线的情况下，将得出的试验数据与“基础数据”进行比较； Before the transformer is put into operation, a set of data is measured as "raw data" without connecting the leads on each side, and a set of data is measured after connecting the leads on each side as "basic data". Whenever the transformer is tested , compare the obtained test data with the "basic data" without removing the leads connecting the transformer to other equipment;
首先对己停电做好安全措施的电力变压器，依次拆除各侧的接地线，把各项目试验时的试验引线依次直接接在套管顶部，同时记录好环境温度、湿度及变压器本体温度，具体试验方法步骤是: Firstly, remove the grounding wires on each side of the power transformer for which safety measures have been taken for power outages, and connect the test lead wires for each item test directly to the top of the bushing in turn, and record the ambient temperature, humidity, and transformer body temperature at the same time. The method steps are:
1）变压器铁芯及夹件绝缘测量：将变压器各侧短路接地； 1) Insulation measurement of transformer iron core and clamps: short-circuit and ground each side of the transformer;
2）变压器各绕组连同套管的绝缘电阻：将兆欧表的G端接地，分别将兆欧表的L端与变压器的待测试绕组、铁芯及夹件连接，L端与变压器的待测试绕组之间串联有单向二极管D, L端通过电容C1后接地，所述的单向二极管D的正极与L端连接，将兆欧表的E端与变压器的非待测试绕组连接，所述的待测试绕组分别为高中压绕组、低压绕组、无绕组，分别得到高中压绕组与铁芯对低压绕组的绝缘电阻R1、低压绕组与铁芯对高中压绕组的绝缘电阻R2、铁芯对高中低压绕组的绝缘电阻R3，该测试结果作为“测量数据”中的绝缘电阻值； 2) The insulation resistance of each winding of the transformer and the bushing: ground the G terminal of the megohmmeter, connect the L terminal of the megohmmeter with the winding, iron core and clamp of the transformer respectively, and connect the L terminal with the transformer to be tested A one-way diode D is connected in series between the windings, and the L terminal is grounded after passing through a capacitor C1. The anode of the one-way diode D is connected to the L terminal, and the E terminal of the megohmmeter is connected to the non-tested winding of the transformer. The windings to be tested are high and medium voltage windings, low voltage windings, and no windings, and the insulation resistance R1 of the high and medium voltage windings and the iron core to the low voltage winding, the insulation resistance R2 of the low voltage winding and the iron core to the high and medium voltage windings, and the insulation resistance of the iron core to the high and medium voltage windings are respectively obtained. The insulation resistance R3 of the low-voltage winding, the test result is used as the insulation resistance value in the "measurement data";
3）分析绕组的绝缘电阻值R：将“测量数据”中的绝缘电阻值与“原始数据”中对应的电阻数值比较，当“测量数据”中的绝缘电阻值大于等于“原始数据”对应的绝缘电阻值的1.3倍时，则各绕组间绝缘良好，当“测量数据”中的至少有一组绝缘电阻值小于“原始数据”对应的绝缘电阻值的1.3倍，但大于“原始数据”对应绝缘电阻值时，将其与“基础数据”中绝缘电阻值比较，当“测量数据”中的绝缘电阻值大于等于“基础数据”中对应的绝缘电阻值的0.7倍时，各绕组间绝缘良好，当“测量数据”中的一组或二组绝缘电阻值小于“基础数据”中对应的绝缘电阻值的0.7倍时，进行变压器油试验，以排除变压器存在的隐患，当“测量数据”中的绝缘电阻数值均小于“基础数据”中对应的绝缘电阻值的0.7倍，或“测量数据”中的绝缘电阻值小于等于“原始数据”中对应的绝缘电阻值时，将变压器返厂修理； 3) Analyze the insulation resistance value R of the winding: compare the insulation resistance value in the "measured data" with the corresponding resistance value in the "raw data", when the insulation resistance value in the "measured data" is greater than or equal to the value corresponding to the "raw data" When the insulation resistance value is 1.3 times, the insulation between the windings is good. When at least one group of insulation resistance values in the "measured data" is less than 1.3 times the insulation resistance value corresponding to the "raw data", but greater than the insulation resistance value corresponding to the "raw data" For the resistance value, compare it with the insulation resistance value in the "basic data". When the insulation resistance value in the "measurement data" is greater than or equal to 0.7 times the corresponding insulation resistance value in the "basic data", the insulation between the windings is good. When one or two sets of insulation resistance values in the "measurement data" are less than 0.7 times the corresponding insulation resistance value in the "basic data", carry out the transformer oil test to eliminate hidden dangers in the transformer. When the "measurement data" in When the insulation resistance values are all less than 0.7 times the corresponding insulation resistance value in the "basic data", or the insulation resistance value in the "measurement data" is less than or equal to the corresponding insulation resistance value in the "raw data", return the transformer to the factory for repair;
4）套管连同绕组的泄漏电流测量：测高压侧时，直流高压发生器的高压引线接变压器高压端，非被测绕组接直流高压发生器高压引线的屏蔽端，同理依次类推测出其它绕组的泄漏电流值； 4) Measurement of the leakage current of the bushing and the winding: when measuring the high voltage side, the high voltage lead wire of the DC high voltage generator is connected to the high voltage end of the transformer, and the non-tested winding is connected to the shielding end of the high voltage lead wire of the DC high voltage generator. The leakage current value of the winding;
将测得的绕组泄漏电流与“原始数据”中的绕组泄漏电流比较，当二者的差异量的绝对值小于等于“原始数据”对应泄漏电流的5%时，则泄漏电流在安全范围内，当二者的差异量的绝对值大于“原始数据”对应泄漏电流的的5%时，进行故障排查。 Compare the measured winding leakage current with the winding leakage current in the "raw data", when the absolute value of the difference between the two is less than or equal to 5% of the leakage current corresponding to the "raw data", the leakage current is within the safe range, When the absolute value of the difference between the two is greater than 5% of the leakage current corresponding to the "raw data", perform troubleshooting.
5）套管连同线圈的介损及电容值测量：对于高电压等级的变压器如110kV及以上，在进行套管连同线圈的介损及电容值测量时，将变压器各侧的避雷器拆除；lOkV避雷器从引线拆除，35kV及以上避雷器从避雷器底座与地相短接处拆开； 5) Measurement of the dielectric loss and capacitance of the bushing and coil: For high-voltage transformers such as 110kV and above, when measuring the dielectric loss and capacitance of the bushing and coil, remove the arresters on each side of the transformer; 10kV arresters Remove it from the lead wire, and remove the 35kV and above arrester from the short connection between the arrester base and the ground phase;
套管的介损和电容值测量、绕组变形检定、变比测量、有载开关动作试验、直流电阻测量按现有技术的常规试验方法试验，最后再对变压器进行消磁后工作结束； The dielectric loss and capacitance value measurement of the bushing, the winding deformation verification, the transformation ratio measurement, the on-load switch action test, and the DC resistance measurement are tested according to the conventional test methods of the prior art, and finally the transformer is degaussed and the work is completed;
将“测量数据”中的套管电容量与“原始数据”中的套管的对应的套管电容量比较，当二者的差异量的绝对值小于等于“原始数据”中对应的电容量的5%时，认为套管正常，当二者的差异量大于“原始数据”对应的电容量5%时，进行故障排查。 Compare the bushing capacitance in the "measured data" with the corresponding bushing capacitance in the "raw data", when the absolute value of the difference between the two is less than or equal to the corresponding capacitance in the "raw data" When the value is 5%, it is considered that the bushing is normal. When the difference between the two is greater than 5% of the capacitance corresponding to the "raw data", perform troubleshooting.
进一步，所述兆欧表的额定电流≥0.8mA。 Further, the rated current of the megger is ≥0.8mA.
进一步，所述兆欧表E端输出电压为4000V～6000V。 Further, the output voltage of the terminal E of the megohmmeter is 4000V-6000V.
进一步，所述单向二极管D的正向导通电流≥3A。 Further, the forward conduction current of the unidirectional diode D is ≥3A.
以上所述仅为本发明的较佳实施例而已，并不用以限制本发明，凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。 The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of the present invention. within the scope of protection.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107807282A (en) * | 2017-10-31 | 2018-03-16 | 国网福建省电力有限公司 | The method of tested media loss factor and capacitance under transformer non-dismantle high voltages fuse |
| CN108732512A (en) * | 2018-06-13 | 2018-11-02 | 任志广 | A kind of data collection module applied to high voltage power supply |
| CN108872771A (en) * | 2018-07-11 | 2018-11-23 | 云南电网有限责任公司电力科学研究院 | A kind of transformer preventive trial equivalent method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107807282A (en) * | 2017-10-31 | 2018-03-16 | 国网福建省电力有限公司 | The method of tested media loss factor and capacitance under transformer non-dismantle high voltages fuse |
| CN108732512A (en) * | 2018-06-13 | 2018-11-02 | 任志广 | A kind of data collection module applied to high voltage power supply |
| CN108732512B (en) * | 2018-06-13 | 2020-11-24 | 任志广 | A data collection module applied to high voltage power supply |
| CN108872771A (en) * | 2018-07-11 | 2018-11-23 | 云南电网有限责任公司电力科学研究院 | A kind of transformer preventive trial equivalent method |
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Application publication date: 20131218 |