Merlin Gerin New Watt-hour meter
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1 Merlin Gerin ew Watt-hour meter
2 2002 Building regulations On 1st April 2002 the new Approved Document L2 of the Building Regulations came into effect. This document is concerned with the conservation of fuel and power in buildings other than dwellings. Section 3 of this document is concerned with the provision of information to the building owner and/or occupier to enable energy consumption to be monitored and controlled. The document makes proposals of how the Regulations can be met. Sufficient energy meters should be installed to enable actual energy consumption to be measured. At least 90% of the annual energy consumption should be accounted for, either by calculation or by actual measurement. Recommendations are made about the size of plant that should have separate metering: Rated input power Boiler installations 50kW Chiller installations 20kW Electric humidifiers 10kW Motor control centres feeding fans and pumps 10kW Final electrical distribution boards 50kW These recommendations indicate that quite small loads should be measured to enable energy conservation actions to be taken. ew range of modular watt-hour meters The Merlin Gerin range of ME watt-hour meters are ideally suited for measuring the energy taken by these loads. The meters are small modular type, easily fitted into distribution boards or individual enclosures. They have a non-resettable main display with options for a resettable secondary display and a pulse output for remote energy recording. For simplicity, loads up to 63A may be direct connected. Higher loads are measured using current transformers, the ratio of which is programmed into the meter at the commissioning stage. The available ratios range from 40/5 up to 6000/5. The meters are of modular dimensions, mounted onto symmetrical DI rail with all displays and settings on the front face. 2
3 Benefits Ideally suited for check metering and allocating costs Provides information on energy consumption Helps the industrial, commercial and tertiary sectors meet the requirements of the Building Regulations (Part L2) by identifying where energy is being used Helps identification of inefficient and wasteful equipment Reduced size allows installation within existing equipment or in small extension boxes. Features ew range of watt-hour meters Easy to read digital display Small modular size DI rail mounted Direct connected up to 63A Current transformer operated, ratios from 40/5 to 6000/5 Ratio programmed by installer Very low burden Liquid crystal main display, non-resettable Optional partial display, resettable Optional pulse output for remote metering Easy installation into distribution boards Suitable for 240V single phase and 415V three phase supplies Tropicalised: 95% relative humidity at 55 o C. 3
4 Watt-hour meters ME Watt-hour meters (rms) are designed for the measurement of energy consumed by an electrical load, single phase, three phase 3 wire or three phase 4 wire. Common technical data Accuracy class: 2 Frequency: 50/60 Hz Consumption: 2.5 VA Total meter: On one phase (single-phase network), on the 3 phases (three-phase network) capacity : - ME1, ME1z, ME1zr, ME3, ME3zr, ME4, and ME4zr: MWh - ME4zrt associated with a CT rating < 150 A: MWh - ME4zrt associated with a CT rating > 150 A: MWh Display: in or MWh with 5 significant digits Partial meter: On a phase (single-phase network), on the 3 phases (three-phase network) With RESET Capacity: - ME1z, ME1zr, ME3zr, and ME4zr: MWh - ME4zrt associated with a CT rating < 150 A: MWh - ME4zrt associated with a CT rating > 150 A: MWh Display: in or MWh with 4 significant digits Flashing meter indicator (yellow) on front panel Operating temperature: C to C Connection using tunnel terminals: Main connection: 16 mm 2 Secondary connection: 6 mm 2 Conform to IEC 1036 standard (with a sealable enclosure). 4
5 Watt-hour meters ME Extensive range ME1 single-phase watt-hour meter Direct measurement up to 63 A Meter indicator: 1000 flashes per Wiring error indicator. ME1z Single-phase watt-hour meter with partial meter Direct measurement up to 63 A Meter indicator: 1000 flashes per Wiring error indicator. ME1zr Single-phase watt-hour meter with partial meter and pulse output for remote metering Direct measurement up to 63 A Meter indicator: 1000 flashes per Pulse output via.o. contact: Wiring error indicator. ME3 Three-phase watt-hour meter for 3 wire system Direct measurement up to 63 A per phase Meter indicator: 100 flashes per. ME3zr Three-phase watt-hour meter for 3 wire system with partial meter and pulse output for remote metering Direct measurement up to 63 A per phase Meter indicator: 100 flashes per Pulse output via.o. contact. ME4 Three-phase watt-hour meter for 4 wire system Direct measurement up to 63 A per phase Meter indicator: 100 flashes per. ME4zr Three-phase watt-hour meter for 4 wire system with partial meter and pulse output for remote metering Direct measurement up to 63 A per phase Meter indicator: 100 flashes per Pulse output via.o. contact. ME4zrt Three-phase watt-hour meter with or without neutral, with partial meter and pulse output for remote metering, for use with current transformers (not supplied) CT measurement: ratio 40/5 to 6000/5 (configurable) Consumption of each measured input: 0.05 VA at 5 A Meter indicator: 10,000/x flashes per (x = CT rating) example: CT 500/5 = 10,000/500 flashes per = 20 flashes per Pulse output via.o. contact. 5
6 Watt-hour meters ME Selection tables These meters are designed for sub-metering purposes. They measure the electrical energy consumed by single phase or three phase loads and all have a non-resettable total display. Some devices also have a partial display which is resettable. Displays are in or MWh and have 5 significant figures. ME1 ME1z ME1zr ME3 ME3zr ME4 ME4zr ME4zrt Operation Single phase Three phase 3 wire Three phase 4 wire Rated voltage 230V 50/60Hz 1P+ 400V 50/60Hz 3P 230/400V 50/60Hz 3P+ Current measurement Whole current single phase 63A Whole current three phase 63A Using CTs /5 Total meter capacity MWh with /5 CTs 9,999.9 MWh with /5 CTs Partial meter, resettable Pulse output Wiring error indicator Width in 18mm modules * ME4Zrt Selectable current transformer ratios 40/5, 50/5, 60/5, 75/5, 80/5, 100/5, 125/5, 150/5, 200/5,250/5,300/5, 400/5, 500/5, 600/5, 800/5, 1000/5, 1200/5, 1250/5, 1500/5, 2000/5, 2500/5, 3000/5, 4000/5, 5000/5, 6000/5. IP55 sealable transparent cover and flush mounting kit These kits allows one ME3 or 4 (4 modules wide) or one or two ME1 (2 modules wide) meters to be mounted behind a cover on a front panel. The clear cover is hinged and may be retained closed by a wire seal or two M4 screws (not supplied) to deter unauthorised access. The flush mounting kit provides DI rail and supporting brackets on which to mount the meter or meters. Product Transparent cover complete with flush mounting kit Transparent cover only Catalogue no B 99246A 6
7 0,1imp/ 0,1imp/ 1imp/ 230Va50/60Hz 10(63)A CL imp/ 100imp/ 100imp/ 10/ximp/ 10/ximp/ 10000/ximp/ 10000/ximp/ Watt-hour meters ME References Type Rating Voltage rating Cat. no. Width in mod. (A) (V ac) of 18 mm Single phase ME ME1z ME1zr L ME1zr L L L Type Rating Voltage rating Cat. no. Width in mod. (A) (V ac) of 18 mm 3 phase 3 wire ME3 63 3x ME3zr 63 3x ME4zrt (CT) 3x L1 L2 L3 L1 L2 L3 ME3zr 3x400Va50/60Hz 10(63)A CL.2 ME3zrt 3x400Va50/60Hz x/5a CL L1 L1 L2 L2 L3 L3 L1/ L2 L3/ L1 L2 L3 Type Rating Voltage rating Cat. no. Width in mod. (A) (V ac) of 18 mm 3 phase 4 wire ME4 63 3x230/ ME4zr 63 3x230/ ME4zrt (CT) 3x230/ L1 L2 L3 L1 L2 L3 ME4zr 3x230/400Va50/60Hz 10(63)A CL.2 ME4zrt 3x230/400Va50/60Hz x/5a CL L1 L1 L2 L2 L3 L3 L1/ L2/ L3/ L1 L2 L3 7
8 Watt-hour meters ME Displays and settings imp./ MERLI GERI 10(63)A Cl.2 230Va 50/60Hz 1000 imp./ ME1zr L L ME1, ME1z, ME1zr Single-phase watt-hour meter ➀ Partial or total meter display ➁ Flashing meter indicator ➂ Pushbutton: partial or total meter display, RESET of partial meter (ME1z, ME1zr) ➃ Pulse output for remote metering (ME1zr) ➄ Wiring error indicator imp./ MERLI GERI 10(63)A Cl.2 3x400Va 50/60Hz 100 imp./ ME3zr L1 L1 L2 L2 L3 L ME3, ME3zr Three-phase watt-hour meter without neutral ➀ Partial or total meter display ➁ Flashing meter indicator ➂ Pushbutton: partial or total meter display, RESET of partial meter (ME3zr) ➃ Pulse output for remote metering (ME3zr) imp./ MERLI GERI 10(63)A Cl. 2 3x230/400Va 50/60Hz ME4zr L1 100 imp./ L1 L2 L2 L3 L ME4, ME4zr Three-phase watt-hour meter + neutral ➀ Partial or total meter display ➁ Flashing meter indicator ➂ Pushbutton: partial or total meter display, RESET of partial meter (ME4zr) ➃ Pulse output for remote metering (ME4zr) /x imp./ MERLI GERI x/5a Cl. 2 50/60Hz 3x230/400Va 3x400Va L1 L2 L /x imp./ ME4zrt (L1) (L2) (L3) ME4zrt Three-phase watt-hour meter with or without neutral + CT ➀ Partial or total meter display and CT rating display ➁ Flashing meter indicator ➂ Pushbutton: partial or total meter display, RESET of partial meter, display or selection of CT rating ➃ Pulse output for remote metering. 8
9 0,1imp/ 0,1imp/ 10/ximp/ 10/ximp/ 1imp/ 230Va50/60Hz 10(63)A CL imp/ 100imp/ 100imp/ 10000/ximp/ 10000/ximp/ Watt-hour meters ME Connection diagrams and impulse output data L ME1, ME1z, ME1zr : direct measurement up to 63 A ME1zr L L Impulse contact O for remote metering (ME1zr): 1 impulse of 200 ms per 18 ma (24 V DC) 100 ma (230 V AC). L L1 L2 L3 ME3, ME3zr : direct measurement up to 63 A ME3zr 3x400Va50/60Hz 10(63)A CL L1 L1 L2 L2 L3 L3 Impulse contact O for remote metering (ME3zr): 1 impulse of 200 ms every ma (24 V DC) 100 ma (230 V AC). L1 L2 L3 L1 L2 L3 ME4, ME4zr : direct measurement up to 63 A ME4zr 3x230/400Va50/60Hz 10(63)A CL L1 L1 L2 L2 L3 L3 Impulse contact O for remote metering (ME4zr): 1 impulse of 200 ms every ma (24 V DC) 100 ma (230 V AC). L1 L2 L3 L1 L2 L3 ME4zrt : CT measurement (ratio from 40/5 to 6000/5) three-phase network 3x400V - 50 Hz ME3zrt 3x400Va50/60Hz x/5a CL L1/ L2 L3/ Impulse contact O for remote metering: 10/x impulse of 200 ms per (x = CT rating) = x/10 per impulse, example: CT 500/5 --> 500/10 per impulse = 50 per impulse 18 ma (24 V DC) 100 ma (230 V AC). Warning: do not link the CT secondaries nor connect them to earth L1 L2 L3 ME4zrt 3x230/400Va50/60Hz x/5a CL.2 ME4zrt : CT measurement (ratio from 40/5 to 6000/5) three-phase network 3x230/400V - 50 Hz L1/ L2/ L3/ Impulse contact O for remote metering: 10/x impulse of 200 ms per (x = CT rating) = x/10 per impulse, example: CT 500/5 --> 500/10 per impulse = 50 per impulse 18 ma (24 V DC) 100 ma (230 V AC). Warning: do not link the CT secondaries nor connect them to earth 9
10 Current transformers Measurement and indication Current transformers are for use with watt-hour meters, ammeters and other current sensing devices. Secondary current 5A, ratio Ip / 5 Technical data Secondary current: 5A Maximum voltage rating Ue: 720V Frequency: 50 60Hz Permanent permissible overload: 1.2 In Safety factor - 40 to 4000A primary: Fs<5-5000, 6000A primary: Fs<10 I0 Ambient installation temperature - Standard range: C to 55 0 C - Tropicalised range: C to 60 0 C Relative humidity - Standard range: <95% - Tropicalised range: >95% Standards - Watt-hour meters: BSE61036, IEC61036 (with sealable cover) - Current transformers: BS7626, IEC
11 Current transformers Services and practical advice Current transformer selection Three criteria exist for selecting a CT: 1. The transformation ratio Ip/5 2. The output VA and accuracy class required 3. The physical arrangement 1. The transformation ratio Ip/5 It is recommended that the current transformer primary current selected is the next above the design current of the circuit. e.g. If In = 1390A, select ratio of 1500/5 2. Output VA and accuracy class The accuracy class is a function of the transformer output power and the consumption of the metering circuit. The latter takes the device and cable consumption into account. For a given accuracy class the consumption of the metering circuit must not exceed the power of the current transformer. Cable consumption Secondary circuit Consumption VA per Cable mm 2 route metre at 20 0 C For each temperature rise of 10 0 C the power absorbed by the cables rises by 4% Device consumption Merlin Gerin device Consumption VA Watt-hour meter ME4zrt 0.05 Analogue ammeter 72sq 0.75 Analogue ammeter DI 1.25 Digital ammeter 0.55 Current relay RCI 0.50 Example: consumption of a metering circuit, at 20 0 C Watt-hour meter ME4zrt 0.05VA Digital ammeter 0.55VA 4 metre route length, 2.5mm 2 cable 1.64VA Circuit consumption 2.24VA Required CT ratio is 100/5 From the information given in the table on page 13 it is seen that CT reference will meet class 1 accuracy for this load. 11
12 Current transformers Services and practical advice 3 Current transformer installation All current transformers are suitable for a primary of either cable or busbar. The devices are supplied with fixings to permit mounting on symmetrical DI rail, a flat plate or be fitted to a solid busbar, as detailed in the table below. Secondary terminal covers may be sealed to discourage unauthorised access. Catalogue references DI rail Flat plate Busbar Terminal fixing fixing clamp cover , , Optional (1) , Optional (2) , , (1) Reference (2) Reference Primary connection using copper sleeve The primary connection may be achieved by using a copper sleeve with bolted connections. This generally allows a smaller physical size of CT to be used for a given ratio. Ratios Catalogue references Sleeve reference 40/5 to 200/ , /5 to 600/ , WARIG ever open the secondary circuit of a current transformer whilst the primary circuit is energised. Before any work is performed on the secondary circuit of a current transformer the terminals must be shortcircuited. 12
13 Current transformers Services and practical advice Current transformer aperture mm CT output VA Weight Ratio Cat no. Cat no. circular Maximum busbar Class 0.5 Class 1 Class 3 kg standard tropicalised diameter size 40/ x / x / x / x / x / x x / x x x / x x x / x x x / x x x / x x x 31 or 64 x x / x x 31 or 64 x x / x / x / x x x / x x x / x / x x / x / x / x / x
14 Modular switchgear dimensions Current transformers Catalogue numbers to and to Catalogue numbers to and to Catalogue numbers to and to six Catalogue numbers to and to Catalogue numbers to and to Catalogue numbers to nine Catalogue numbers to Catalogue numbers to Catalogue numbers to Meters ME3, ME4 watt hour meters ME1 watt hour meters Please note: Due to the constant progress in standards and equipment, the characteristics shown in the texts and images are only binding once expressly confirmed by ourselves. 14
15
16 ationwide support on one number - call the Customer Information Centre on Fax Schneider Electric s local support Schneider Electric is committed to supporting its customers at every stage of a project. Our 180 sales engineers, the largest dedicated sales force in the UK electrical industry, operate from 4 customer support centres. Our sales engineers are skilled at assessing individual requirements and combined with the expert support of our product specialists, will develop the most effective and economical answer taking relevant regulations and standards fully into account. To access the expertise of the Schneider Electric group, please call Each customer support centre includes facilities for demonstrations and training, and presentation rooms fully equipped with audio visual and video, providing excellent meeting facilities. Merlin Gerin is a world leader in the manufacture and supply of high, medium and low voltage products for the distribution, protection, control and management of electrical systems. Its quality products, solutions and services are focused on the needs of both the commercial and industrial sectors. Modicon is a world leader in high technology programmable controllers (PLCs) and motion control systems used in industrial automation. Its international catalogue includes PLCs, numerical controllers, terminals, software, multiple fieldbus and ethernet communication networks, and human machine interfaces (HMI). Square D is a total quality organisation and its business is to put electricity to work productively and effectively, protecting people, buildings and equipment. Its low voltage electrical distribution equipment, systems and services are used extensively in residential and commercial applications. Telemecanique is a UK market leader and world expert in industrial control and automation. It provides complete solutions, with its range of components, programmable logic controllers, variable speed drives and communications software. In addition, it offers power distribution through prefabricated busbar trunking. Local customer support centres Scotland Schneider Electric Ltd Unit Academy Business Park Gower Street Glasgow G51 1PR webmastergb@schneider.co.uk South West Schneider Electric Ltd 190 Aztec West Park Avenue Almondsbury Bristol BS32 4TP webmastergb@schneider.co.uk Regional product showrooms orth West Schneider Electric Ltd 8 Brindley Road City Park Business Village Cornbrook Manchester M16 9HQ webmastergb@schneider.co.uk Industrial systems and solutions product showroom Schneider Electric Ltd, University of Warwick Science Park, Sir William Lyons Road, Coventry CV4 7EZ Building systems and solutions product showroom Schneider Electric Ltd, Fordhouse Road, Wolverhampton WV10 9ED Energy and Infrastructure systems and solutions product showroom Schneider Electric Ltd, 123 Jack Lane, Hunslet, Leeds L0 1BS Greater London Schneider Electric Ltd 2nd Floor 408 Strand London WC2R 0E webmastergb@schneider.co.uk MGD JUE 2002
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