Misalai Yadda Tana Ring Main Unit? Abubuwan da Kuma Fadada Ta

1. Bayanin Nau'i

Ring Main Unit (RMU) shine nau'in karamin jirgin kula da sauran karamin kula a cikin dabba mai zurfi ko kula, ko kuma a cikin yankunan modular wadanda ke taimaka a gina shi da nuna abu mai zurfi. Mafi girman muhimmin abubuwan da suka da su sun hada da load switches da fuses, wadda ke taimaka waɗannan masu RMU suka samun inganci, adadin kicce, kudin, kuma samun kyakkyawan kula da darajinsu.

RMUs suna amfani a matsayin na'ura a cikin substations da transformer substations (kafin bayyana), musamman a cikin gidajen rayuwarsa, kabilu masu harkokin sama, kabilu masu asalin sama, da kuma masana'antar kasuwanci.

2. Siffar Tattalin Aiki da Amfani

2.1 Ring Network Power Supply

Don samun kyakkyawan nuna abu, amma abubuwan da suke da su suka samun abu daga biyu na farko, an yi nasara a cikin grids kulan da suka duba wasu ring network Ring Network Supply.

A cikin systems da aka amfani a matsayin 10kV AC distribution systems wadanda ana iya amfani a cikin gidajen kasuwanci, gidajen rayuwarsa, ports, da kabilu masu harkokin sama—indamar da zai iya amfani don kula shine moderate—wadanda ana iya amfani load switches ko vacuum contactors don kula, da kuma high-voltage fuses don inganta. Wannan system shine za a ce ring network system, kuma switchgear da aka amfani shine za a ce Ring Main Unit.

"Ring" shine maimaita a cikin network da aka duba wasu ring: main feeder ya faruwa da ci gaba, da suka samun abu daga biyu na farko. Daga wannan loop, an rarrabe abu ta hanyar switchgear units masu high-voltage.

Wannan tsari ya taimaka waɗannan branchs na distribution suka samun abu daga biyu na farko:

• Idan feeder na baki ya gama, an rarrabe abu daga jeri.

• Idan feeder na jeri ya gama, an rarrabe abu daga baki.

Hakan na biyu na farko, har da haka, kowane branch yana samun dual-source redundancy, wanda ya taimaka waɗannan suka samun kyakkyawan nuna abu.

Kowane outgoing circuit ya haɗa da switchgear unit (outgoing switch cabinet) da baƙin busbar ya taimaka waɗa a cikin ring main. An yi nasara a cikin busbars da suka haɗa da duk outgoing cabinets. Kowane cabinet shine za a ce Ring Main Unit.

Note: RMU na musamman ba a gina "ring" function ba; abubuwan da suke da su sun samu da su idan an yi nasara a cikin ring network na daɗi.

2.2 Kyakkyawan Tsari

Saboda RMUs suna amfani a matsayin na'ura a cikin loads masu adadin kicce (misali, transformers 1250kVA), ba su buƙata da circuit breakers masu kyakkyawa. Ba haka, suke amfani load switches da high-voltage fuses:

• Load switch ya kunshi normal load current switching.

• Fuse ya kunshi short-circuit currents.

Har da haka, suke kawo irin waɗannan circuit breaker—da limits. Wannan tsari ya taimaka waɗannan suka haɗa da complexity, cost, da kuma needs, wanda ya fiye waɗannan suka amfani a matsayin scenarios na infrequent operation.

Sune da lokacin, saboda amfani masu karfin, term "RMU" ya zama na amfani game da ring networks da kuma shine za a ce high-voltage switchgear da aka amfani load switch don kula.

2.3 Market Drivers da Abubuwan

RMUs suna samun karfi masu karfin, saboda:

• Rise of medium- and small-capacity users (transformers ≤1250kVA).

• Demand for stable, long-term power supply with infrequent switching.

• Urban development requiring compact, oil-free electrical equipment in high-rise buildings (due to fire safety and space constraints).

RMUs suna taimaka waɗannan needs da:

• Simple structure

• High operational reliability and safety

• Minimal maintenance

• Low operating costs

Compared to circuit breaker-based switchgear, RMUs offer outstanding advantages. This demand has spurred innovation in smaller, higher-performance load switches, further advancing RMU technology. Today’s RMUs are not only high-performing but also standardized and series-produced, greatly expanding their application range.

3. Common RMU Models

4. Protection Overview

4.1 Microprocessor-Based Protection Relay

Modern RMUs increasingly adopt microprocessor-based protection relays—a high-tech automation product integrating protection, monitoring, control, and communication functions. Developed based on extensive domestic and international experience and tailored to China’s integrated automation systems, it is ideal for building intelligent switchgear.

Key features:

• Built-in library of over 20 standard protection functions.

• Comprehensive data acquisition for analog signals (voltage, current via CTs) and digital status signals.

4.2 Protection Requirements