Overview
| Introduction | QM, QMC and PM are part of SM6 product range.
This SM6 range is made up of modular units and used for the MV/LV substation in secondary distribution system up to 24 kV |
| Application | QM is a fuse load break switch combination unit with striker fuses mechanism (a blown fuse the switch to open). It can be used for transformer protection, cable protection, etc.
QMC is similar to QM but equipped with three CT’s for metering or protection purposes. PM is a fuse load break switch without striker fuses Mechanism. This QM, QMC or PM is normally together in the system with other parts of SM6 product range such as IM, IMC, CM, DM1, DM2, etc., in accordance with the design of a distribution system |
Main
| Basic Equipment | • SF6 Functional load break switch and earthing switch • Three phase busbar 630 A • CI1 operating mechanism (QM & QMC) • CIT operation mechanism (PM) • Three fuses (PM) • Three striker fuses (QM & QMC) • Mechanical indication for blown fuses (QM Application & QMC) • Voltage presence indicators • Downstream earthing switch • Heater 50 W, 220V • Three current transformers (QMC) |
| Condition Monitoring | • Basic : Thermal sensors (TH110) • Option : Humidity sensors (CL110) |
| Options | • Motor for operating mechanism • Key-type interlocks • Auxiliary contacts • Auxiliary contacts for blown fuses • Release units (coil) • Visibility of main contacts • Pressure indicator device • Digital ammeter • Arc detection |
Physical
| Colour | White (RAL 9003) |
| Height | 170 cm – QM/PM/QMC |
| Width | 50 cm QM/PM – 62.5 cm QMC |
| Depth | 84 cm – QM/PM/QMC |
| Net weight | 130 kg QM/PM – 180 kg QMC |
Electrical Characteristics
| Rated Voltage | Ur | kV | 7.2 | 12 | 17.5 | 24 |
| Insulation Level | ||||||
| Insulation | Ud | 50/60 Hz, 1 min (kV rms) | 20 | 28 | 38 | 50 |
| Isolation | Ud | 50/60 Hz, 1 min (kV rms) | 23 | 32 | 45 | 60 |
| Insulation | Up | 1.2/50 µs (kV peak) | 60 | 75 | 95 | 125 |
| Isolation | Up | 1.2/50 µs (kV peak) | 70 | 85 | 110 | 145 |
| Rated voltage | Ur | kV | 7.2 | |
| Breaking capacity | ||||
| Transformer off load | A | 16 | ||
| Cable off load | A | 31.5 | ||
| Rated current | lr | A | 400 – 630 – 1250 | |
| Short-time withstand current | lk/tk^(1) | kA/1 S | 25 | 630 – 1250 |
| 20^(2) | 630 – 1250 | |||
| 16 | 630 – 1250 | |||
| 12.5 | 400 – 630 – 1250 | |||
| Making capacity (50 Hz) | lma | kA | 62.5 | 630 | NA |
| 50 | 630 | |||
| 40 | 630 | |||
| 31.25 | 400 – 630 | |||
Standards & Specification
| IEC Standards | 62271-200 ,62271-1, 62271-103, 62271-105, 62271-100, 62271-102, 61869-2, 61869-3, 60044-8,
62271-206, 62271-304 |
| UTE Standards for SM6-24 | NFC 13.100 NFC 13.200 NFC 64.130 NFC 64.160 |
| EDF Specifications for SM6-24 | HN 64-S-41 HN 64-S-43 |
| SEISMIC Standards for 24 kV | IEEE-693 2005 EN600068-3-3 1993 |
Environmental
| Ambient air temperature | ≤40 °C ≤35 °C on average over 24 hours ≥-5°C |
| Humidity | • Average relative humidity over a 24 hour period, ≤ 95% • Average relative humidity over a 1 month period, ≤ 90% • Average vapor pressure over a 24 hour period, ≤ 2.2 kPa • Average vapor pressure over a 1 month period, ≤ 1.8 kPa.For these conditions, condensation may occasionally occur. Condensation can be expected where sudden temperature changes occur in periods of high humidity.To withstand the effects of high humidity and condensation, such as breakdown of insulation, please pay attention on Civil Engineering recommendations for design of the building or housing, by suitable ventilation and installation. |
| Ambient Air Pollution | No significant pollution by dust, smoke, corrosive and/or flammable gases, vapors or salt. |
| Operating altitude | ≤ 1000 m > 1000 m, a derating coefficient is applied (Please consult us) |
| Solar radiation | No solar radiation influence is permitted. |
| Seismic (24kV & 36 kV) |
• Up to 0.5 g (horizontal) and 0.4 g (vertical) • Class 2 for 24 kV and Class 1 for 36kV • According to standards IEEE-693/2005 and EN 60068-3/1993 for the 24 kV and 36 kV |
| Electro-magnetic compatibility | • Relays: 4 kV withstand capacity, as per recommendation IEC 60801.4 • Compartments: Electrical field: — 40 dB attenuation at 100 MHz — 20 dB attenuation at 200 MHz Magnetic field: 20 dB attenuation below 30 MHz. • According to standards IEEE-693/2005 and EN 60068-3/1993 for 36 kV (please contact us). |
| Temperatures | The cubicles must be stored and installed in a dry area free from dust and with limited temperature variations. • For stocking: from -40°C to +70°C • For working: from -5°C to +40°C • Other temperatures, consult us. |
| Protection Index | • Classes: PI (insulating partition) • Loss of service continuity classes: LSC2A (LSC1 for metering GAM/GBM functions) • Units in switchboard: IP3X • Between compartments: IP2X for SM6-24, IP2XC for SM6-36 • Cubicle: IK08 for SM6-24, IK07 for SM6-36. |
Monitoring
| Continuous Thermal Monitoring | The power connections in the Medium Voltage products are one of the most critical points of the substations especially for those made on site like: • MV Cable connections Loose and faulty connections cause an increase of resistance in localized points that will lead to thermal runaway until the complete failure of the connections.Preventive maintenance can be complicated in severe operating conditions also due to limited accessibility and visibility of the contacts.The continuous thermal monitoring is the most appropriate way to early detect acompromised connection. |
| Easergy TH110 Thermal Sensor | Easergy TH110 is part of the new generation of wireless smart sensors ensuring the continuous thermal monitoring of all the critical connections made on field allowing to: • Prevent unscheduled downtimes • Increase operators and equipments safety • Optimize and predictive maintenanceThanks to its very compact footprint and its wireless communication, Easergy TH110 allows an easy and widespread installation in every possible critical points without impacting the performance of the MV Switchgears.By using Zigbee Green Power communication protocol, Easergy Th110 ensure a reliable and robust communication that can be used to create interoperable solutions evolving in the Industrial Internet of Things (IIoT) age.Easergy TH110 is self powered by the network current and it can ensure high performances providing accurate thermal monitoring being in direct contact with the measured point. |
Transformer Protection
Fuse ratings for SM6 protection units such as PM, QM, QMB and QMC depend among other things, on the following criteria:
• Service voltage
• Transformer rating
• Fuse technology (manufacturer)
Different types of fuses with medium loaded striker may be installed:
• Solefuse fuses as per standard UTE NCF 64.210
• Fusarc CF fuses as per IEC 60.282.1 recommendation and dimensions are related to DIN 43.625 standard
Example: for the protection of a 400 kVA transformer at 10 kV, select either Solefuse
fuses rated 43 A or Fusarc CF fuses rated 50 A.
For fuse-switch combination unit type QM, QMB, QMC, refer only to the selection table and reference list of fuses . For all other type of fuses, consult us.
Fuse Selection Table
Packing Units
| Unit Type of Package 1 | PCE |
| Number of Units in Package 1 | 1 |
| Package 1 Height | 190 cm |
| Package 1 Width | 60 cm |
| Package 1 Length | 120 cm |
| Package 1 Weight | 145 kg |
Contractual warranty
| Warranty | 12 Months |
