Product Description
YM-GTXGN-12 solid-insulated ring main unit switchgear is a new generation of environment-friendly combined insulated ring main unit developed by our company. It is a fully sealed power supply unit and each live part or switch is sealed in an epoxy plastic shell without SF6 gas in the shell. The whole switchgear is not influenced by external environments to ensure operation reliability and personnel safety without maintenance.
The solid insulated ring main unit has three types of switches, such as V unit (circuit breaker unit), C unit (load switch unit), F unit (combined appliance unit), each unit can be used individually or expanded freely. Its structure is divided into intelligent control instrumentation room, actuator, and primary part. The instrumentation room can be equipped with microcomputer protection controller. The primary part is made by APG automatic gel process to solid seal the insulation switch and arc-extinguishing chamber into the epoxy resin completely, with a special terminal to connect with the bus. The arc-extinguishing chamber is made of special copper-chromium contact material, R-type longitudinal magnetic field contact, and a complete primary sealing process. The arc-extinguishing chamber’s short-circuit current breaking capacity, stability, electric life, temperature rise, and insulation level are significantly improved compared with previous arc-extinguishing chambers (copper-aluminum contact material, cup-shaped longitudinal magnetic field contact structure, and an incomplete primary sealing process).
The actuator has a spring actuator combined with the switch, i.e., the insulation switch and the main switch spring actuator are combined for interlocking, with fewer components and higher reliability and without unnecessary transmissions. Electric actuation is available when required by a user.
The solid insulated enclosed switchgear: solid insulation material is used as the main insulation medium, and these components of the main electric circuit, such as conductive connector, isolation switch, grounding switch, main bus, branch bus, and so on, are combined, encapsulated into a completely insulated and sealed module with one or more functions by solid insulation medium, and it may be combined or expanded further.
The ring main unit is ideal for 12kV, 50Hz three-phase AC power distribution systems for ring main unit or terminal power distribution. The ring main unit can be installed in the distribution systems for industrial and mining enterprises, residential buildings, schools and parks, as well as in compact substations, for the control and protection of power distribution transformers. Therefore, both indoor and outdoor ring main units can be used for power distribution automation.
Main Technical Parameters
| Item | Unit | Parameter | |
| Rated voltage | KV | 12 | |
| Rated current | A | 630 | |
| Rated short-time withstand current (4) | KA | 25 | |
| Rated peak withstand current | KA | 50 | |
| Rated short-circuit closing current (4) | KA | 50 | |
| Rated active load breaking current | A | 630 | |
| Rated closed loop breaking current | A | 630 | |
| Rated cable charge breaking current | A | 10 | |
| Rated breaking transfer current of combined appliance | A | 3700 | |
| 1 min power frequency withstand voltage | Phase-to-phase, phase-to-ground vacuum breaking | KV | 42 |
| Insulation breaking | KV | 48 | |
| Lightning impact withstand voltage | Phase-to-phase, phase-to-ground vacuum breaking | KV | 75 |
| Insulation breaking | KV | 85 | |
| Mechanical life | Circuit breaker | TIME | 10000 |
| Insulation knife, grounding knife | TIME | 3000 | |
| Protection grade | IP4X | ||
| Shell protection grade | IP4X | ||
| Partial discharge | PC | ≤20(Measured at 1.2Ur) | |
