American Standard Ring Network Cabinet缩略图

American Standard Ring Network Cabinet

The IEEE standard is a standard developed by the American Institute of Electrical and Electronics Engineers to ensure the correct operation and interoperability of electrical equipment, to promote interconnectivity between different devices, and to improve the reliability and safety of equipment, and it is widely used in North America and other regions.

According to statistics, 78% of the world adopts IEC standards, 8% adopts IEEE standards, and 9% adopts GOST (Russian Standard) standards. The countries adopting China GB standard account for 1%, and the remaining 4% of the countries are adopting a mixture of standards.
IEEE standards usually include two types: Recommended Practice and Standard. Recommended Standards are suggested technical guidelines, while Standards are specifications that must be followed.

The main families of standards for IEEE standard switchgear are the following standards:

a). IEEE StdC37.20.2TM Standard for Metal-Clad Switchgear;

b). IEEE StdC37.20.3TM Standard for Metal Clad Switchgear (1 kV~38 kV);

c). IEEE StdC37.20.4TM AC Switches for Use in Metal-Enclosed Indoor Switchgear (1 kV~38 kV);

d). IEEE StdC37.20.6TM. 4.76 kV to 38 kV metal-enclosed switchgear grounding and testing devices;

e). IEEE StdC37.20.7TM. metal-enclosed switchgear internal arc testing;

f). IEEE StdC37.20.1TM. metal-enclosed low voltage (1000 Vac and below, 3200 Vdc and below) power circuit breaker switchgear;

g). IEEE StdC37.20.9TM Metal-enclosed switchgear for gas-insulated systems (1 kV to 52 kV);

h. IEEE Std C37.23TM metal-enclosed busbar;

i). IEEE std C37.04 AC High Voltage Circuit Breaker Standard Rating Structures.

American Standard Ring Network Cabinet插图

Wherein the IEEE StdC37.20.9TM standard defines the design, testing, and installation of metal-enclosed switchgear (referred to in English as MEGIS) with gases above ambient pressure for AC voltages from 1 kV to 52 kV as the insulating medium. This includes, but is not limited to, circuit breakers, switches, bushings, busbars, metering transformers, cable terminations, instrumentation and control and protection relays. Vertical units of switchgear, some or all medium voltage compartments utilize pressure-filled gas as the primary insulating medium, and the standard applies to both indoor and outdoor installations.

The dominant switchgear in the U.S. market has been air-insulated, metal-clad switchgear, with American-style box transformers used for ring-grid distribution, and high-voltage components such as load switches and high-voltage fuses placed inside tanks filled with high-flash-point oil along with transformer cores and windings, or with air-insulated load switches.

For 600A 16/20kV ring network cabinet, the use of the standard is not a gas-filled cabinet, IEEE standard ring network cabinet is called the scientific name of the ring network distribution switchgear Underground Distribution Switchgear

Adopted standard IEEE C37.74-

Underground, basement, and pedestal-mounted load-interrupting switchgear and fused load-interrupting switchgear for a.c. systems up to and including 38 kV.
Includes: Pad-Mounted Style.
Pad-Mounted Style. with optional pedestal style enclosure for ground mounting; mild steel or stainless steel enclosures available;
UnderCover™ buried ground operation.
Vault-Mounted Style.

General Requirements.

Rated 15-29.3 kV, 630A, 12.5/16/20 kA systems.

IEEE 386 600 ampere interface bolted, i.e., American style connectors.

Front-end fixed structure and hot bar operable; and

Clear view window for easy visual verification of contact status.

Compact, modular and mechanically interlocked with the connected switch or circuit breaker.

The 15kV is capable of withstanding the full 125 kV Basic Insulation Level (BIL) impulse withstand voltage without the need for a series-connected vacuum interrupter to provide voltage withstand support;

Therefore, the use of gas-insulated switchgear is late. With the introduction of gas-insulated switchgear produced by ABB, Schneider and other European manufacturers to the United States, customers began to accept and use gas-insulated switchgear, so the IEEE standard for gas-insulated switchgear was formulated late and was only formally released in 2019, which is basically compiled with reference to the IEC standard, and it is only for the parameter, structure, and test that it has been modified in accordance with the IEEE C37.20.2 and other standards. to meet the requirements of the IEEE standard for product safety.

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