XGN66-12 (Z) Box-Type AC Metal-Enclosed Switchgear
1、Product Overview
The XGN66-12 (Z) box-type AC metal-enclosed switchgear is designed for use
in three-phase AC 50Hz systems with rated voltages of 3, 6, and 12 kV for power
reception and distribution. It employs ZN21-12 and ZN28-12 series vacuum circuit
breakers as the main switches, with optional installation of VS1, VD4, or ZN68
series models. The isolating switches utilize GN30-10 series rotary types. Featuring
advanced electronic components and innovative structural design, this modular
unit offers easy assembly, low operating force, and convenient maintenance. Its
reliable “Five Protection Lockout” system combines compact size, sophisticated
housing construction, and fully enclosed compartments. Each compartment—
including the instrument room, busbar room, circuit breaker room, and cable
room—is independently sealed with natural ventilation outlets for pressure relief,
ensuring
long
service
life,
minimal
maintenance
requirements,
user-friendly
operation, and high reliability. As a next-generation solution for 12kV fixed
switchgears, it complies with the “Five Protection Lockout” standards mandated by
China’s Ministry of Machinery Industry and Ministry of Electric Power. The
equipment meets both National Standard GB3906-91 (“AC Metal-Enclosed Switch-
gear for 3–35 kV”) and GB/T11022-1999 (“Common Technical Requirements for
High-Voltage Switchgear and Control Equipment”).
Create high-quality products that give customers peace of
mind.
Made
high-quality
products
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customers
HXGN-12 Ring Main Unit
1、Product Overview
The HXGN-12 ring main unit is an indoor metal-enclosed switchgear
designed for 3–10 kV single busbar and single-line segmented systems to
receive and distribute electrical power. As a next-generation high-voltage
electrical product tailored for urban renovation and construction, its
technical specifications comply with GB3906 “3–35 kV AC Metal-Enclosed
Switchgear,” the international IPC298 standard, and the “Five Protection”
requirements specified in both the Mechanical and Electrical sections. It
achieves an IP3X protection rating, featuring compact size, lightweight
construction,
simple
operation,
low
operating
force,
clearly
defined
breaking points, enhanced safety and maintenance convenience, stable
reliability, and, when required, three-phase linkage capability. Comparative
analysis with international standards and expert evaluation confirm that its
core technologies meet contemporary international benchmarks for similar
products.
2、Main Application
Ring main units are designed for three-phase power distribution systems with a rated voltage of 10 kV and a rated frequency of 50 Hz, suitable
for use in factories, mines, residential communities, high-rise buildings, schools, parks, and other locations to receive and distribute electrical
energy. They can be employed for both ring network power supply and terminal power supply applications.
3、Environmental Conditions for
Use
3.1 The altitude shall not exceed 1000 m;
3.2 The ambient temperature shall not exceed +40°C nor fall below-25°C;
3.3 Relative humidity: daily average not exceeding 95%, monthly average not exceeding 90%;
3.4 The seismic intensity does not exceed 8 degrees;
3.5 This product is intended for use in environments free from fire and explosion hazards, with severe penalties for contamination, chemical corrosion, or intense vibration.
2、Main Technical Parameters
Item
Unit
Parameter
Rated voltage
kV
7.2、12
Dielectric level
1-minute power frequency withstand voltage test
kV
32–42 (Isolation gap: 48 kV)
Lightning impulse withstand voltage
kV
60–75 (isolation voltage: 85 kV)
Rated frequency
Hz
50
Main busbar rated current
A
630、1250、2000、2500、3150
Branch bus rated current
A
315、630、1250、1600、2000、2500、3150
4-second thermal stability current (effective value)
kA
16、20、25、31.5、40
Rated dynamic stability current (effective value)
kA
40、50、63、80、100
Levels of protection
外壳IP3X
External Dimensions (Height × Width × Depth)
mm
1100×1200×2600
Note: 1. Rated current ≥2000 A; cabinet width 1200 mm; 2. Overhead incoming/outgoing line cabinet depth 1650 mm; 3. Bypass-equipped cabinet depth 1800 mm