· This product is designed and manufactured in compliance with GB and IEC standards.
· Manufactured with a structural design featuring vacuum arc extinction and all-insulated environmentally friendly gas.
· The air box achieves an IP67 protection rating and remains free of leaks or the need for refilling/adding air throughout its installation process and service life.
· The product meets requirements for altitudes of 5,000 meters and below.
· Suitable for operation in environments with industrial pollution, salt spray, and high humidity; meets C3 standards on land and C4 standards at sea.
10. Offshore and onshore wind power substations for 20kV voltage networks;
10. Energy storage and photovoltaic box-type substations for 20kV voltage grid integration;
10. Ring main units for step-up or step-down voltage transformation and distribution in 20kV networks.
Widely used in distribution substations and packaged substations located at load centers such as urban residential communities, high-rise buildings, large public buildings, and industrial enterprises.
Ring main units come in two types: individual-unit designs and common-cabinet designs. Among the individual-unit designs, there are four categories: load switch cabinets, isolating PT cabinets, and circuit breaker cabinets.
·Upper isolator, lower circuit breaker cabinet
·Upper circuit breaker, lower isolating switchgear
·Isolation PT cabinet (PT)
·Load switchgear
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Operating continuity levels defined in GB/T 3906 |
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Other high-voltage compartments or functional units remain energized. |
LSC 1: Lower service continuity |
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LSC 1 LSC 2 | |
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LSC 2: Higher Service Continuity |
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● | |
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Partition between compartments |
PI: Insulating partition |
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PI PM |
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PM: Metal Grounding Baffle |
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● | |
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Insulation and Switching |
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Main circuit disconnection |
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Vacuum circuit breaker |
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Interrupting medium |
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Vacuum arc-extinguishing chamber |
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Insulating medium |
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Dry air |
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Relative inflation pressure |
Rated inflation pressure (gauge pressure at 20℃) |
MPa |
0.04 |
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Minimum inflation pressure (gauge pressure at 20℃) |
MPa |
0.02 |
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Annual relative leakage rate of gas |
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%/year |
≤0.01 |
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Insulation level |
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Rated voltage |
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kV |
12/24 |
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Rated frequency |
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Hertz |
50 |
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Rated insulation level |
Power-frequency withstand voltage (phase-to-phase, phase-to-ground, vacuum interrupter contacts) |
kV |
42/65 |
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Power-frequency withstand voltage (isolated break) |
kV |
48/79 |
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Power-frequency withstand voltage (auxiliary and control circuits) |
kV |
2 |
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Lightning impulse withstand voltage (phase-to-phase, phase-to-ground, vacuum interrupter) |
kV |
75/125 |
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Lightning Impulse Withstand Voltage (Isolation Break) |
kV |
85/145 |
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Current level |
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Rated current—busbar |
A |
630 |
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Rated short-circuit breaking current |
kA |
25 |
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Rated short-circuit making current (main switch/grounding switch) |
kA |
63/63 |
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Short-time withstand current and duration (main circuit + earthing switch, earthing connection) |
kA/s |
25/4 . 21.75/2 |
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Rated peak withstand current (main circuit + earthing switch, earthing connection) |
kA |
63/54.81 |
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Internal arc fault withstand capability |
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Grade A |
AFLR front, side, and rear |
kA |
20 | |
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Duration |
S |
0.5 |
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Enclosure protection rating |
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Complies with GB/T4208 standard enclosure protection. |
An energized electrical box |
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IP67 |
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Cable Room |
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IP43 |
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Institutional Room |
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IP4X |
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Low-pressure room |
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IP4X |
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Mechanical impact protection rating |
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Grade compliant with GB/T 20138 |
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IK07 | ||
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Other features |
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Expected service life |
Year |
30 |
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Busbar/grounding busbar (copper bar) |
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120 mm² |
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