Ceramic reinforced covering. It is intended for the packaging of low-oil circuit breakers of VMT series for a voltage of 110, 150 and 220 kV. The covering is designed for placement the electrical devices of the circuit breaker and protecting them from the weather and mechanical effects. They meet the requirements of 16-88 ILYAN.686174.031 TU. The material of the insulation part is a ceramic electrotechnical material of a subgroup 130.1 GOST 20419-83.
| Covering name | Designation of the drawing | GOST, TU, IEC | Voltage class, kV | The length of the insulation distance is not less than, cm | N, mm | D outer, mm | Weight, kg | Rough drawing | |
| nom. | prev. deviation ±10% | ||||||||
| ПВМГ – 110Б О | ИЛЯН.686174.031СБ | TU 16-88 ИЛЯН686174.031ТУ | 110 | 285 | 1326 | 460 | 252,0 | 25,2 |  |
| ПВМГ – 150Б О | ИНЯЖ.686174.039СБ | TU 16-88 ИЛЯН686174.031ТУ | 150 | 390 | 1760 | 460 | 304,0 | 30,4 | |
| ПВМО – 110Б-2 О | ИЛЯН.686174.032-01СБ | TU 16-88 ИЛЯН686174.031ТУ | 110 | 285 | 1306 | 440 | 168,0 | 16,8 | |
| ПВМО – 150Б О | ИНЯЖ.686174.038СБ | TU 16-88 ИЛЯН686174.031ТУ | 150 | 390 | 1654 | 448 | 190,0 | 19,0 | |
Interpretation of the conventional value of a covering type:
P – covering;
V – circuit breaker;
M – low-oil;
o – bearing support of the interrupter pole;
g – arc blowout device of the circuit breaker;
110; 150 – breaker voltage class, kV;
B – category along an external insulation leakage distance according to GOST 9920-89;
1; 2; 3 – modification;
O – climatic version according to GOST 15150-69.
The purpose of the equipment being packaged with a covering: low-oil high-voltage circuit breakers (Vk) are designed for operative and emergency commutation in power systems, for carrying out the operations of switching on and off the individual circuits with manual and automatic control.
The material of the insulation part is a ceramic electrotechnical material of a subgroup 130.1 GOST 20419-83.