描述
A16B-1010-0050
对厂家送来的电能表实物进行检验，主要是从以下几个方面进行。即：机械要求、所能适应的气候条件、电气要求、电磁兼容性、准确度要求这五个方面。这五个方面在国家标准《1级和2级静止式交流有功电能表》(GB/T17215-1998)中都有明确的规定。规定中有些试验和检验项目一般地市级及县级供电企业有条件检验，但有相当多的项目还不具备条件检验。下面将需要注意的地方和解决的办法做一简要说明。 对厂家送来的电能表实物进行检验，主要是从以下几个方面进行。即：机械要求、所能适应的气候条件、电气要求、电磁兼容性、准确度要求这五个方面。这五个方面在国家标准《1级和2级静止式交流有功电能表》(GB/T17215-1998)中都有明确的规定。规定中有些试验和检验项目一般地市级及县级供电企业有条件检验，但有相当多的项目还不具备条件检验。下面将需要注意的地方和解决的办法做一简要说明。准确度要求包括，电流及功率因数改变、电压改变、频率改变、起动试验、潜力试验、走字试验等这些项目的检验一般地市级及县级供电企业都能进行检验。电子式电能表在规程规定的负载范围内，一般线性度都比较好，但不同厂家的表实际准确计量的负载范围有很大差别，由于现场实际负载电流是经常变化的，能准确计量的负载范围越宽，表的负载性能越好。在农村有些地区电网电压波动比较大。要注意检查电压波动极限情况下，电能表的误差。特别是低电压时的轻载误差和电能表走字是否有力，检查表内直流电源电压不能下降到计量器及芯片的工作电压以下，直流电源的波纹不能有明显地增加。电气要求的功率消耗检验，包括电压线路和电流线路，可以用互感器校验仪测量电能表的电压、电流和负载阻抗后，计算出额定电压、额定电流下电能表的功率消耗。这种方法既准确又方便;电源影响、电压降落和短时中断、自热影响可以在电能表校验台上模拟进行;短时过电流会影响检验，严格按规程定义做比较困难，可以在2倍最大电流下，逐步延长时间，检测电能表的温升(电流端子及取样电阻)和误差。这可以了解电能表过负载后的损坏程度。这两项对电子式电能来说都很重要。尤其是电磁兼容性能对电子式电能表影响极为严重，电磁兼容性能较差的表，现场运行中往往出现”死机”、”飞字”等现象，甚至内部电子元件损坏。这是电子式电能表有别于机械式电能表的一个重要特性。电磁兼容检验一共有5个项目，即：静电放电试验、高频电磁场试验、电快速瞬变脉冲群试验、浪涌试验、无线电干扰抑制试验。其中浪涌和脉冲群比较接近电网中的一些瞬态情况，建议有条件的地市级及县级供电企业购置相应设备，对电能表进行抽查检验。 另外需要注意的有，由于目前电子表的机械计量器，还没有从原理上根本解决卡字问题。主要是通过选择制造工艺好的计量器和进厂时严格筛选保证电能表整机质量。因此，要特别注意计量器的质量。步进电机有屏蔽可以防电磁干扰，外壳采用铝合金支架、齿轮精细、无毛刺、材料不易变形、有自润滑性能、步进电机磁性能强、加工精密，都可以减少卡字的问题。要注意仔细检查和了解。再就是要进行走字检验。为更严格地考核计量器质量，保证安装到现场的电能表在电压允许范围内都能正确计量，建议采用本地区电网可能出现的最低(不考虑暂态)电压进行走字试验。
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