The HXGN-12 AC Metal-enclosed Switchgear (commonly known as Ring Main Unit) is a new type of high-voltage switchgear developed to meet the demands of urban power grid renovation and construction. In power supply systems, it is used for breaking load currents and short-circuit currents, as well as for making short-circuit currents.
This Ring Main Unit is equipped with a vacuum load-break switch. The operating mechanism is a spring-operated mechanism, which allows for both manual and electrical operation. The earthing switch and the isolating disconnector are fitted with manual operating mechanisms. This unit offers high-level system integration, compact size, eliminates risks of fire and explosion, and features reliable “Five Protections” interlocking safety functions.
◆ Employs a fully assembled structure, making it lightweight, aesthetically pleasing, and allowing for flexible combination and installation, facilitating unlimited expansion.
◆ Compatible with either the FN12-10 type puffer-type load-break switch/composite apparatus or the FN25-12 type vacuum load-break switch/composite apparatus, with completely identical installation dimensions. Features a compact size, maintenance-free design, three-phase linkage structure, and provides a clearly visible isolation gap.
◆ When equipped with the FN12-10 puffer-type load-break switch/composite apparatus, it offers flexible installation options: left-side, right-side, upright, or inverted mounting.
◆ Capable of both manual and electrical operation, and includes remote control functionality.
◆ Incorporates comprehensive mechanical interlocking and inter-tripping devices, fully achieving the “Five Protections” safety functions.
◆ Utilizes linked protective insulating shutters to shield live contacts, ensuring personnel safety.
◆ Designed for front-side operation and maintenance, allowing for installation against a wall.
◆ The front door is fitted with an observation window for clear viewing of the internal components’ status.
◆ Complies with the GB3906 standard.
When placing an order, customers must provide the following information:
◆ Main circuit connection diagram/scheme.
◆ Switchgear installation floor plan/layout drawing.
◆ Schematic diagrams for auxiliary circuits and control circuits within the switchgear (if required).
◆ Other special requirement documents.
| No. | Item | Unit | FN12-10 | FN25-12 | ||
| 1 | Rated voltage | KV | 12 | |||
| 2 | 1 min power frequency withstand voltage | To earth and phase to phase:42 isolation clearance 48 | ||||
| 3 | Lightning impulse voltage(peak value) | To earth and phase to phase:75 Isolation clearance:85 | ||||
| 4 | Rated frequency | HZ | 50 | |||
| 5 | Rated current of main bus | A | 630 | |||
| 6 | Load switch | Rated current | A | 630 | ||
| 7 | Electrical life under the rated current | Times | No less than 100 | |||
| 8 | Open circuit no-load transformer capacity | KVA | 1250 | |||
| 9 | Rated short-time withstand current | KA/S | 20/4；Earthing switch 20/2 | |||
| 10 | Rated dynamic stability current (peak value) | KA | 50 | |||
| 11 | Rated short circuit close current (peak value) | KA | 50 | |||
| 12 | Rated current of the fuse | A | 100 | |||
| 13 | Composite apparatus | Rated transfer current | A | 1500 | 2000 | |
| 14 | Rated short circuit breaking current | KA | 31.5 | |||
| 15 | Type of fuse | S□LAJ-12 (XRNT□-10) | ||||
| 16 | Mechanical life | Times | 2000 | 10000 | ||
| 17 | Auxiliary circuit 1 min power frequency withstand voltage | KV | 2 | |||
| 18 | lectric operating mechanism working voltage | V | AC and DC 220:110 | |||
| 19 | Protection grade | IP2X | ||||
| 20 | Outline dimension (width×depth ×height) | mm | 650(850)×900×2000(2200) | |||
