The KGC series SF6 gas fully insulated compact ring main unit (RMU) is a new type of medium-voltage switchgear with SF6 gas insulation independently developed by Mojü Company. The product adopts a modular design and can be arbitrarily arranged according to different design schemes, achieving a perfect combination of the common box unit and the expandable unit to meet the flexible use requirements of compact switchgear in various secondary transmission and distribution substations.
The KGC series switchgear is a fully sealed system. All its primary components are enclosed in a stainless-steel housing and are not affected by the environment. It has the characteristics of reliable operation, safety guarantee, compact structure design, small space occupation, maintenance-free, and long service life.
The product has passed the type test at the national high-voltage electrical appliance test center and is widely used in small secondary substations, box-type switch stations, industrial and mining enterprises, airports, railways, commercial areas, high-rise buildings, expressways, subways, tunnels, and places with harsh natural conditions.
Execution standards
GB/T3804 High-voltage alternating-current load switches for 3.6kV to 40.5kV
GB/T1984 High-voltage alternating-current circuit-breakers
GB/T16926 High-voltage alternating-current load switch-fuse combinations
GB/T1985 High-voltage alternating-current disconnectors and earthing switches
GB/T3906 3.6kV to 40.5kV Alternating-current metal-enclosed switchgear and controlgear
GB/T11022 Common technical requirements for high-voltage switchgear and controlgear standards
GB/T4208 Degrees of protection provided by enclosures (IP code)
DL/T404 3.6kV to 40.5kV Alternating-current metal-enclosed switchgear and controlgear
GB/T311.1 Insulation co-ordination - Part 1: Definitions, principles and rules
Main Technical Parameter Table of KGC-40.5 Ring Main Unit
Serial number | Project | unit | Load switch unit | Circuit breaker unit | |||
1 | Rated voltage | kV | 40.5 | 40.5 | |||
2 | Rated frequency | Hz | 50 | 50 | |||
3 | Rated current | A | 630 | 630 | |||
4 | Rated Insulation Level | 1min Power frequency withstand voltage | Interphase, to ground | kV | 95 | 95 | |
fracture surface | kV | 118 | 118 | ||||
Control and auxiliary circuits | kV | 2 | 2 | ||||
Lightning impulse withstand voltage | Interphase, to ground | kV | 185 | 185 | |||
fracture surface | kV | 215 | 215 | ||||
5 | Rated short-time withstand current / Duration | kA/s | 25/3 | 25/3 | |||
6 | Rated peak withstand current | kA | 63 | 63 | |||
7 | Rated short - circuit breaking current | kA | —— | 25 | |||
8 | Rated short - circuit making current | kA | 63 | 63 | |||
9 | Rated transfer current | A | —— | —— | |||
10 | Rated active load breaking current | A | 630 | —— | |||
11 | Rated closed-loop breaking current | A | 630 | 630 | |||
12 | Rated operating sequence | / | —— | O-0.3s-CO-180s-CO | |||
13 | Mechanical life | Load switch/Circuit breaker | times | 5000 | 10000 | ||
Isolation/Earthing Switch | times | 3000 | 3000 | ||||
14 | Loop resistance | μΩ | ≤150 | ≤180 | |||
15 | Rated inflation pressure (gauge pressure at 20℃) | MPa | 0.04 | ||||
16 | Annual relative gas leakage rate | year | ≤0.01% | ||||
17 | Insulating gas | SF6 | |||||
18 | Protection level | Compartment (IP code) | / | IP2XC | |||
Gas tank (IP code) | / | IP67 | |||||
Cabinet (IP code) | / | IP4X | |||||
Cabinet (IK code) | / | IK10 | |||||
Installation size table
Number of shared box units | 1 | 2 |
Net width of the gas tank | 450(C)/500(V) | 900(C)/1000(V) |
Note: The total width of the cabinet body is determined by the end plate matched with the user's plan. In addition, according to the user's needs, cabinet types with standardized dimensions of the State Grid can be provided.
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