Fully Enclosed Gas-Insulated Ring Main Unit Switchgear
HY SafeRingCustomized according to drawings and needs
The HY SafeRing fully enclosed gas-insulated ring main unit is suitable for secondary distribution networks' ring units. With various fixed combination configurations, it can meet the demands of most distribution networks. All live parts and switches are enclosed in a stainless steel casing, featuring safety, reliability, high flexibility, small size, light weight, simple operation, long service life, high parameters, no pollution, and low maintenance. It complies with IEC62271 and GB3906 standards. It has "five-prevention functions", reliable mechanical interlocks, and anti-misoperation functions. There are two options for transformer protection: load switch-fuse combination and circuit breaker with relay protection. It is applicable to AC 50Hz, 10kV power networks as ring and terminal power supply equipment. It has natural interlocks (grounding, opening, and closing positions). It is suitable for: compact secondary substations, light industry, wind power plants, residential areas, hotels and shopping centers, mines, airports, railways, and subways.
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Structural Features
SafeRing is available in standard configurations of 2, 3, 4 or 5 circuits and can be equipped with additional devices as per customer requirements. SafeRing adopts a ring main unit structure. Within the same SF6 insulated gas chamber, SafeRing can accommodate up to 5 modules, offering 18 fixed combination options for distribution networks, catering to the vast majority of scenarios requiring ring network power supply. The combination forms of SafeRing include DF, DV, CF, and FC. CV, CCC, CCF, CFC, CFF, CCV, CCCC, CCCF, CCFF, CCCV, CCVV, CCCCC, CCFFF, CCW.
Usage environmentNormal operating environmental conditions
Maximum temperature
40℃
Minimum temperature:
-40℃
Maximum average relative humidity
≤95%
Altitude
≤2000 meters
Seismic resistance
Seismic intensity not exceeding 8 degrees
Water vapor pressure
Daily average water vapor pressure not exceeding 2.2 kPa,
monthly average not exceeding 1.8 kPa
The surrounding air should not contain corrosive or
flammable gases, water vapor or other obvious pollutants
No severe pollution or frequent violent vibration
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Performance indicators
SF6 gas pressure:
Absolute pressure of 1.4 bar at 20℃
Annual gas leakage rate
0.2‰/year
Protection grade:
IP67
Thickness of stainless steel gas
chamber
3.0mm
Busbar
Busbar inside switchgear
400mm2Cu
Grounding busbar of switchgear
150 mm2Cu
C Module
F Module
V Module
Load Switch
Combined
Switchgear
Vacuum Switch
Isolation/Groundi ng Switch
Rated Voltage（kV）
12
12
12
12
Rated Frequency（Hz）
50
50
50
50
Power Frequency Withstand
Voltage(Phase-to-
Phase/Interrupter)（kV）
42/48
42/48
42 、48
42/48
Lightning Impulse Withstand
Voltage（kV）
75/85
75/85
75/85
75/85
Rated Current
630
Dependent on
the rated value
of the fuse
630
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Rated Short-Circuit Breaking
CurrentkA
----
31.5
20
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Rated Closed-Circuit Breaking
Current A
630
---
630
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Rated Cable Charging Breaking
Current A
10
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10
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Rated Short-Time Withstand
Current kA/3s
20
---
20
20
Rated Peak Withstand Current
kA
50
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50
50