发电机交流耐压试验作业指导书

CONTRACTOR

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。

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)