Work Instruction for Generator HV Withstand Test
Rev. Date Compiled by Review Approval Work Instruction for Generator HV Withstand Test Document No KTPP-0-SEPS-COM-WI-4009 PROJECT 4x350 MW Kamalanga Thermal Power Project GMR卡玛朗加能源有限公司 GMR KAMALANGA ENERGY LIMITED 拉玛雅国际咨询有限公司 OWNER OWNER’s ENGINEER LAHMEYER INTERNATIONAL (INDIA) PVT. LTD. CONSULTING ENGINEERS,GURGAON EPC CONTRACTOR 山东电力基本建设总公司 SEPCO ELECTRIC POWER CONSTRUCTION CORPORATION SUB CONTRACTOR KTPP-0-SEPS-COM-WI-4009
Work Instruction for Generator HV Withstand Test
1. 工程概况
Brief introduction of the project
卡玛朗加火力发电厂由GMR能源有限公司在现场兴建，该位置位于印度奥里萨邦德赫克纳尔区。该项目为新建工程，包括四台机组，每台机组容量为350MW。本工程采用东方电机股份有限公司生产的三相发电机，额定功率350MW，功率因数0.85，端电压20kV，频率50Hz，转速为3000rpm。汽轮发电机采用水-氢-氢冷却方式。
The Kamalanga Thermal Power Station would be set up by GMR kamalanga Energy Limited at a site, which falls under the Dhenkanal district of Orissa, India. The project is a Greenfield project consisting of four units each of 350 MW. The generators proposed for the plant are of three phase, manufactured by DFEM, with the rated power of 350MW, power factor of 0.85 lagging, terminal voltage of 20kV, frequency of 50Hz and speed of 3000rpm. The turbine generator adopts the typical water-hydrogen-hydrogen cooling system. 2．编制依据
References of the compilation
下列文件中的条款通过本作业指导书的引用而成为本作业指导书的条款。 The prescriptions in the documents listed below are included in this work instruction by quotation.
2.1）GB 50150-2006 电气设备交接试验标准；
GB50150-2006 Standard for hand-over test of electric equipment ; 2.2)DL5009.1-2002 电力建设安全工作规程
DL5009.1-2002 Safety work regulations of electric power construction 2.3）QFSN-300-2-20型汽轮发电机安装说明书 QFSN-300-2-20 Turbine generator installation manual 3．试验项目及程序 Testing items and progress 3.1）试验项目 Testing items
3.1.1）定子绕组的绝缘电阻、吸收比、极化指数测量。
Measurement of IR、Absorptance、Polarization index of stator winding. 3.1.2）定子绕组端部现包绝缘施加直流电压测量。
KTPP-0-SEPS-COM-WI-4009
Work Instruction for Generator HV Withstand Test
DC HV test of generator stator winding overhang handmade insulation. 3.1.3）定子绕组直流耐压试验和泄漏电流测量。
Stator winding DC HV test and measurement of leakage current. 3.1.4）定子绕组交流耐压试验。 AC HV test of stator winding. 3.2）试验程序 Test program
3.2.1）试验开始之前详细记录试品的铭牌参数，检查、了解试品的状态，并进行记录。 Record the parameters on nameplate in details before test, inspect the condition of the materials being tested, and make records.
3.2.2）按先低压试验后高压试验、先直流后交流的顺序进行试验。在绝缘电阻测量无异常后再进行耐压试验。交流耐压试验后重复测试绝缘电阻，以判断耐压试验前后试品的绝缘有无变化。
The LV test shall be carried out prior to HV test, and DC test shall be carried out before AC test. The withstand voltage test shall be carried out after measuring the insulted resistance. Test the insulted resistance again after AC withstand voltage test, so as to know the difference of insulated status of tested pieces before and after test. 4. 施工准备
Construction preparation
4.1）水内冷发电机专用绝缘电阻测试仪、温度计、湿度计。
Special IR tester for water cooling generator、Thermometer、Hygrometer. 4.2）直流高压发生装置。 DC high voltage generator. 4.3）成套工频交流耐压装置。
Power frequency AC withstand voltage device.
4.3.1）试验变压器高压侧额定电流 In应大于试品所需电流Ix，其中Ix可按下式估算： Ix=2πfCxUx≈2.5A（f—试验电源频率50Hz，Cx—被试绕组对地等效电容0.225*10-6F，Ux—试验电压32800V）
The rated current In on high-voltage side of the test transformer should be greater than current Ix required by the test product , where Ix can be estimated as follows:
Ix = 2πfCxUx ≈ 2.5A (f-test power supply frequency 50Hz, Cx-trial winding on equivalent capacitance of 0.225 * 10 -6 F Ux-test voltage 32800V)
KTPP-0-SEPS-COM-WI-4009
Work Instruction for Generator HV Withstand Test
4.3.2）试验变压器，容量可按下式计算：S＞2πfCxUx2 ＞80kVA（f—试验电源频率50Hz，Cx—被试绕组对地等效电容0.225*10-6F，Ux—试验电压32800V）
Test transformer capacity can be calculated as follows: S> 2πfCxUx 2> 80kVA (f-test power supply frequency of 50Hz, Cx-trial winding to ground the equivalent capacitance of0.225 * 10 -6 F the Ux-test voltage 32800V )
4.3.3）调压器，容量与试验变压器匹配。 Regulator, capacity match with the test transformer. 5．施工工艺流程 Construction process
5.1）定子绕组的绝缘电阻、吸收比、极化指数测量。
Measurement of IR、Absorptance、Polarization index of stator winding. 5.1.1）测量并记录环境温度和湿度。
Measure and record the ambient temperature and humidity.
5.1.2）将汇水管用导线引至试验场地，把汇水管所有引下线拧在一起，用万用表测量汇水管对地电阻，应大于30kΩ。将汇水管引线接至专用兆欧表的屏蔽端子上。
Leading the cooling water pipe by wire to the test site, all of deflectors of cooling water pipe screwed together; measure cooling water pipe resistance to ground with the multimeter, which should be greater than 30kΩ. Leading cooling water pipe conductors to the shield terminal on dedicated megger.
5.1.3）分相测量，每相绕组必须头尾短接，并将非被试绕组、转子绕组接地。 Take sub-phase measurements, each phase winding must be head to tail by short joint and ground the winding not to be tested and rotor winding.
5.1.4）将地线端子用接地线和发电机外壳连接好，用绝缘把手将测试线接触到被测量绕组的引出端头上，开始测量，记录15s、60s、600s的绝缘电阻值。
The earth terminal shall be connected with the ground line and the generator casing, use
insulating handle to contact the test line to the leading end of the head of the measuring winding, start the measurement, recording 15s, 60s, 600s, insulation resistance value. 5.1.4）各相绝缘电阻的不平衡系数≤2（不平衡系数=最大值/最小值）。 The unbalance factor of insulation resistance of each phase ≤ 2 the (unbalanced coefficient = max / min).
5.1.5）吸收比≥1.6，极化指数≥2。 Absorption ratio ≥ 1.6, polarization index ≥ 2. 5.2）定子绕组端部现包绝缘施加直流电压测量。
KTPP-0-SEPS-COM-WI-4009
Work Instruction for Generator HV Withstand Test
DC HV test of generator stator winding overhang handmade insulation. 5.2.1）用铝箔将引线接头现场包绝缘部位包裹严实。
Wrap the package insulation parts of the leading wire joints at site by aluminum foil tightly. 5.2.2）发电机三相绕组加直流电压至20kV，用100MΩ电阻杆串微安表逐点测试包铝箔的部位，同时记录微安表的读数。
Generator three-phase windings plus the DC voltage to 20kV, test parts of aluminum foil point by point with the the 100MΩ resistor rod string microammete, while recording microammeter readings.
5.2.3）根据U=IR，计算表面电位（U—表面电位，I—微安表的读数，R—100MΩ）。 Calculated according to U = IR, the surface potential (U-surface potential, I-microammeter readings, the R-100MΩ). 5.2.4）要求各点电压≤1900V。 Voltage of each point≤ 1900V.
5.3）定子绕组直流耐压试验和泄漏电流测量。
Stator winding DC HV test and measurement of leakage current .
5.3.1）试验电压为电机额定电压的3倍（60kV）。转子绕组在滑环处接地。发电机出口电流互感器二次绕组短路接地。埋置测温元件在接线端子处电气连接后接地。
The test voltage is 3 times the rated motor voltage (60kV). Rotor winding get grounded at slip rings. Export of generator current transformer secondary winding is shorted to ground. Embedded temperature measurement devices get electrical connected at the terminals before get grounding. 5.3.2)分相测量，每相绕组必须头尾短接，并将非被试绕组、转子绕组接地。 Take sub-phase measurements, each phase winding must be head to tail by short joint and ground the winding not to be tested and rotor winding.
5.3.3）试验电压按每级0.5倍额定电压分阶段升高，每阶段停留1min，并记录泄露电流；在规定的试验电压下，泄露电流应符合下列规定：（1）各相泄露电流的差别不应大于最小值的100%，当最大泄露电流在20μA以下，根据绝缘电阻值和交流耐压试验结果综合判断为良好时，各相间差值可不考虑；（2）泄露电流不应随时间延长而增大；（3）泄露电流随电压不成比例地显著增长时，应及时分析。
Per level of the test voltage is 0.5 times the rated voltage in phases elevated, each stage
stay 1min, and record the leakage current; under specified test voltage, leakage current should meet the following requirements: (1) the leakage current of each phase of the 100% of the difference should not be greater than the minimum, maximum leakage current of20μA or less, according to the value of insulation resistance and AC voltage test results to determine a good all-white difference may not be considered; (2) leakage current should not be with the time increases; (3) with voltage disproportionately significant increase in leakage current, timely analysis.
KTPP-0-SEPS-COM-WI-4009
发电机交流耐压试验作业指导书
