iSM6 Air Insulation Ring Main Unit

Air Insulation Ring Main Unit

UN-RMU Air Insulation Ring Main Unit

Model Number: UN-RMU

Rated Voltage: 7kv 12kv 17.5kv 24kv 36kv

Standard: IEC

Frequency: 50/60Hz

 

Product Description

Air Insulation Ring Main Unit

Medium Voltage Switchgear

The Unisun enjoy more than 16 year experience manufacture SF6 Ring main Unit in china. We import first APG line from Germany to localized air pressure guage production craft, our APG manufacturing including SF6 switch disconnector, embedded pole and etc epoxy resin insulation parts. UN-RMU units are used for the MV section in MV/LV transformer substations in public distribution systems and MV consumer or distribution substations up to 24 kV.

UN-RMU Ring Main Unit

Ring Main Unit

 

Feature

The UN-RMU range is made up of modular units containing metal-enclosed SF6 switchgear, using Sulphur hexafluoride (SF6) or vacuum:

  • switch-disconnector;
  • VD4S vaccum circuit breaker;
  • Vacuum contactor;
  • disconnerctor.

 

Unit definitions

Below is the list of range units used in MV/LV transformer substations and industrial distribution substations:

  • IM, IMC, IMB switch;
  • PM fused switch;
  • QM, QMC, QMB fuse-switch combination;
  • CRM contactor and contactor with fuses;
  • DM1-A, DM1-D, DM1-S single-isolationSF6 type circuit breaker;
  • DMV-A, DMV-D, DMV-S single-isolationvacuum type circuit breaker;
  • DM1-W, DM1-Z withdrawable single-isolationSF6 type circuit breaker;
  • DM2 double-isolation SF6 type circuit breaker;
  • CM, CM2 voltage transformers;
  • GBC-A, GBC-B current and/or voltagemeasurements;

 

Standards

  • IEC:60694:
  • IEC62271-200
  • IEC60265
  • IEC60420
  • IEC60255
  • IEC62271-100
  • IEC62271-102

 

Main characteristics

Rated voltage (kV) 7.2 12 17.5 24
Insulation level
50 Hz, 1 mn Insulation 20 28 38 50
(kV rms) Isolation 23 32 45 60
1.2/50μs Insulation 60 75* 95 125
(kV peak) Isolation 70 85 110 145
Breaking capacity
Transformer off load (A) 16
Cables off load (A) 31.5
Short-time withstand current 25 630 – 1250 A
(kA.1 s) 20 630 – 1250 A
16 630 – 1250 A
12.5 400 – 630 – 1250 A

The making capacity is equal to 2.5 times the short-time withstand current.
* 60 kV peak for the CRM unit.

 

Maximum breaking capacity

Rated voltage (kV) 7.2 12 17.5 24
Units
IM, IMC, IMB, 630 A – 800 A*
NSM-cables, NSM-busbars
PM, QM, QMC, QMB 25 kA 20 kA
CRM 10 kA 8 kA
CRM with fuses 25 kA
SF6 circuit breaker range:
DM1-A, DM1-D, DM1-W, DM1-Z, DM1-S, DM2 25 kA 20 kA
Vacuum circuit breaker range:
DMV-A, DMV-D, DMV-S 25 kA 20 kA

* in 800 A consult us.

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