◆ 结构
放电球隙测压器(水平式)由活动动底座、绝缘支管、铜球、调节轴(标尺)、微调轮、水电阻等部件组成。
◆ 球隙器的使用
在作试验时将球隙器和试品并联，将球隙调整在60%试验电压。测定球隙放电时试验电压值(取3~4次平均值)，然后按同样方法测定70%和80%试验电压表读数。以此三点线值作一曲线(大多为一直线)，再延长此曲线(大多按正比例推算)至所需的试验电压高10~15%位置作为耐压验过程可能发生过电压的放电保护电压值。
◆ 一球接地的球隙适用于交流电压、负极性的雷电冲击电压和长波尾冲击及两种极性的直流电压 kV（峰值）
| 球隙距离(cm) | 球直径(cm) | |||||
| 5 | 6.25 | 10 | 12.5 | 15 | 25 | |
| 0.20 | 8.0 | |||||
| 0.25 | 9.6 | |||||
| 0.30 | 11.2 | |||||
| 0.40 | 14.3 | 14.2 | ||||
| 0.50 | 17.4 | 17.2 | 16.8 | 16.8 | 16.8 | |
| 0.60 | 20.4 | 20.2 | 19.9 | 19.9 | 19.9 | |
| 0.70 | 23.4 | 23.7 | 23.0 | 23.0 | 23.0 | |
| 0.80 | 26.3 | 26.2 | 26.0 | 26.0 | 26.0 | |
| 0.90 | 29.2 | 29.1 | 28.9 | 28.9 | 28.9 | |
| 1.0 | 32.0 | 31.9 | 31.7 | 31.7 | 31.7 | 31.7 |
| 1.2 | 37.6 | 37.5 | 37.4 | 37.4 | 37.4 | 37.4 |
| 1.4 | 42.9 | 42.9 | 42.9 | 42.9 | 42.9 | 42.9 |
| 1.5 | 45.5 | 45.5 | 45.5 | 45.5 | 45.5 | 45.5 |
| 1.6 | 48.1 | 48.1 | 48.1 | 48.1 | 48.1 | 48.1 |
| 1.8 | 53.0 | 53.5 | 53.5 | 53.5 | 53.5 | 53.5 |
| 2.0 | 57.5 | 56.5 | 59.0 | 59.0 | 59.0 | 59.0 |
| 2.2 | 61.5 | 63.0 | 64.5 | 64.5 | 64.5 | 64.5 |
| 2.4 | 65.5 | 67.5 | 69.5 | 70.0 | 70.0 | 70.0 |
| 2.6 | (69.0) | 72.0 | 74.5 | 75.0 | 75.5 | 75.5 |
| 2.8 | (72.5) | 76.0 | 79.5 | 80.0 | 80.5 | 81.0 |
| 3.0 | (32.5) | 79.5 | 84.5 | 85.0 | 85.5 | 86.5 |
| 3.5 | (88.5) | (87.5) | 95.5 | 97.0 | 98.0 | 99.0 |
| 4.0 | (95.0) | 10.5 | 108 | 110 | 112 | |
| 4.5 | (101) | 150 | 119 | 122 | 125 | |
| 5.0 | (107) | 123 | 129 | 133 | 137 | |
| 5.5 | (131) | 138 | 143 | 149 | ||
| 6.0 | (138) | 146 | 152 | 161 | ||
| 6.5 | (144) | (154) | 161 | 173 | ||
| 7.0 | (150) | (161) | 169 | 184 | ||
| 7.5 | (155) | (168) | 177 | 195 | ||
| 8.0 | (174) | (185) | 206 | |||
| 9.0 | (185) | (198) | 226 | |||
| 10 | (195) | (209) | 244 | |||
| 11 | (219) | 261 | ||||
| 12 | (229) | 273 | ||||
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