MR MESSKO MPREC Operating Instructions Manual
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MR MESSKO MPREC Operating Instructions Manual

Pressure relief device
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Pressure Relief Device
®
®
MESSKO
MPREC
Operating Instructions
BA5789879-01 EN

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Summary of Contents for MR MESSKO MPREC

  • Page 1 Pressure Relief Device ® ® MESSKO MPREC Operating Instructions BA5789879-01 EN...
  • Page 2 © All rights reserved by Messko GmbH Dissemination and reproduction of this document and use and disclosure of its content are strictly prohibited unless expressly permitted. Infringements will result in liability for compensation. All rights reserved in the event of the granting of patents, utility models or designs. The product may have been altered since this document was published.

  • Page 3: Table Of Contents

    Table of contents Introduction................ 5 Manufacturer.................. 5 Subject to change without notice .............  5 Completeness..................  5 Safekeeping.................. 6 Notation conventions ...............  6 1.5.1 Hazard communication system .............. 6 1.5.2 Information system.................. 8 1.5.3 Instruction system .................. 8 1.5.4 Typographic conventions ................ 9 Safety................... 10 Intended use ..................
  • Page 4 Table of contents Storage of shipments.............. 24 Further transport ................ 24 Mounting ................ 25 Mounting pressure relief device with standard protective cover .. 27 Mounting pressure relief device with OD protective cover.....  30 Electrically connecting the pressure relief device ...... 35 5.3.1 Connecting cable screw connections............

  • Page 5: Introduction

    1 Introduction This technical document contains detailed descriptions on the safe and proper installation, connection, commissioning and monitoring of the prod- uct. It also includes safety instructions and general information about the prod- uct. This technical document is intended solely for specially trained and autho- rized personnel.

  • Page 6: Safekeeping

    1 Introduction The following documents apply to this product: ▪ Operating instructions ▪ Test certificate 1.4 Safekeeping Keep this technical file and all supporting documents ready at hand and ac- cessible for future use at all times. 1.5 Notation conventions This section contains an overview of the symbols and textual emphasis used.
  • Page 7 1 Introduction 1.5.1.3 Signal words and pictograms The following signal words are used: Signal word Definition DANGER Indicates a hazardous situation which, if not avoided, will result in death or serious injury. WARNING Indicates a hazardous situation which, if not avoided, could result in death or serious injury.

  • Page 8: Information System

    1 Introduction Pictogram Definition Warning of a tipping hazard Warning of a hot surface Table 2: Pictograms used in warning notices 1.5.2 Information system Information is designed to simplify and improve understanding of particular procedures. In this technical file it is laid out as follows: Important information.

  • Page 9: Typographic Conventions

    1 Introduction Aim of action ü Requirements (optional). 1. Step 1. ð Result of step (optional). 2. Step 2. ð Result of step (optional). ð Result of action (optional). 1.5.4 Typographic conventions The following typographic conventions are used in this technical file: Typographic convention Purpose Example UPPERCASE...

  • Page 10: Safety

    2 Safety This technical document contains detailed descriptions on the safe and proper installation, connection, commissioning and monitoring of the prod- uct. ▪ Read this technical document through carefully to familiarize yourself with the product. ▪ This technical document is a part of the product. ▪...

  • Page 11: Fundamental Safety Instructions

    2 Safety ▪ Use the equipment and special tools supplied solely for the intended pur- pose and in accordance with the specifications of this technical document. ▪ Only operate the product in industrial areas. Observe the notices in this technical document regarding electromagnetic compatibility and the tech- nical data.
  • Page 12 2 Safety Safety markings Warning signs and safety information plates are safety markings on the product. They are an important aspect of the safety concept. Safety mark- ings are depicted and described in the chapter "Product description". ▪ Observe all safety markings on the product. ▪...
  • Page 13 2 Safety Electrically skilled person The electrically skilled person has a technical qualification and therefore has the required knowledge and experience, and is also conversant with the ap- plicable standards and regulations. The electrically skilled person is also pro- ficient in the following: ▪...
  • Page 14 2 Safety E-mail: service@reinhausen.com Internet: www.reinhausen.com 2.4 Personal protective equipment Personal protective equipment must be worn during work to minimize risks to health. ▪ Always wear the personal protective equipment required for the job at hand. ▪ Never wear damaged personal protective equipment. ▪...
  • Page 15 2 Safety Hard hat To protect from falling and flying parts and mate- rials. Hearing protection To protect from hearing damage. Protective gloves To protect from mechanical, thermal, and electri- cal hazards. BA5789879-01 EN...

  • Page 16: Product Description

    3 Product description This chapter contains an overview of the design and function of the product. 3.1 Scope of delivery The following components are included in the delivery: ▪ MPREC® pressure relief device ▪ Technical documents ▪ O-ring 95x3 (only for MPREC® with OD protective cover) ▪...

  • Page 17: Design/Versions

    3 Product description The pressure relief device is available with various tripping pressures. Type Tripping pressure [psi] [bar] [kPa] LMPRD 4 psi 4 ± 1 0.28 +/- 0.07 28 +/- 6.9 LMPRD 6 psi 6 ± 1 0.41 +/- 0.07 41 +/- 6.9 LMPRD 8 psi 8 ±...
  • Page 18 3 Product description The signal pin has a cap that can be screwed off so that the protective cover can be removed from the device flange. The signal pin has different colors depending on the type and suitability of the gasket materials for various insu- lation fluids in the transformer/on-load tap-changer: ▪...
  • Page 19 3 Product description 7 Cable bushing M20x1.5 on the mi- 8 Protective cover cro-switch 9 Signal pin (red for mineral oil, blue 10 Signal pin cap for silicon oil) 11 Semaphore (optional) 12 1 or 2 micro-switches, alternatively without 13 Counter bearing for spring assem- 14 6 fixing screws 15 Valve plate 16 Mounting seal ring Ø...
  • Page 20 3 Product description The following graphic shows the key parts of the pressure relief device: Figure 2: Pressure relief device with OD protective cover 1 Oil escape opening 2 Pipe connection with o-ring 95x3 and 3 hexagon screws M12x40 with washer and spring washer, wrench size 19 3 OD protective cover 4 4 housing screws M8x100, wrench...

  • Page 21: Nameplate

    3 Product description 3.4 Nameplate The nameplate is on the stand plate for the pressure relief device with stan- dard protective cover, and on the flat surface on the cover for the version with OD protective cover. Figure 3: Nameplate on the MPREC BA5789879-01 EN...

  • Page 22: Packaging, Transport And Storage

    4 Packaging, transport and storage 4.1 Purpose The packaging is designed to protect the packaged product during transport, loading, unloading and during periods of storage in such a way that no detri- mental changes occur. The packaging must protect the goods against per- mitted transport stresses such as vibration, knocks and moisture (rain, snow, condensation).
  • Page 23 4 Packaging, transport and storage Every delivered shipment must be checked for the following by the recipient before acceptance (acknowledgment of receipt): ▪ Completeness based on the delivery slip ▪ External damage of any kind. The checks must take place after unloading, when the box or transport con- tainer can be accessed from all sides.

  • Page 24: Storage Of Shipments

    4 Packaging, transport and storage 4.5 Storage of shipments When selecting and setting up the storage location, ensure the following: ▪ Store the product and accessories in the original packaging until installa- tion. ▪ Protect stored goods against moisture (rain, flooding, water from melting snow and ice), dirt, pests such as rats, mice, termites etc.

  • Page 25: Mounting

    5 Mounting This chapter describes how to mount and connect the device correctly. The pressure relief device is mounted on a device flange on the transformer tank or on-load tap-changer. Note the connection diagrams provided. DANGER Electric shock! Risk of fatal injury due to electrical voltage. Always observe the following safety regulations when working in or on electri- cal equipment.
  • Page 26 5 Mounting When mounting the standard version vertically, the stand plate [►Section 5.1, Page 27] must face either to the left or right. When mounting the OD version, the oil escape opening [►Section 3.3.2, Page 19] must face down- wards in order to ensure complete drainage of the oil in the event of tripping. Figure 4: Possible mounting positions There must be a clearance of at least 100 mm above or in front of the de- vice, and at least 170 mm with a semaphore.

  • Page 27: Mounting Pressure Relief Device With Standard Protective Cover

    5 Mounting 5.1 Mounting pressure relief device with standard protective cover In order to mount the device, you must open it. Only close it again once mounted. Figure 5: Mounting pressure relief device with standard protective cover 1 3 hexagon screws M6x10, wrench 2 Ground connection (only with plug size 10 connection)
  • Page 28 5 Mounting Opening the device Prepare for mounting the device as follows: 1. In order that the protective cover can be removed, pull out signal pin (5) and screw off the signal pin cap (6) using 2 open-ended wrenches, wrench size 12 and 32. 2.
  • Page 29 5 Mounting Closing the device After mounting, proceed as follows: 1. If the device is equipped with micro-switches for remote transmission of the signals, first connect these micro-switches, see Electrically connecting the pressure relief device [►Section 5.3, Page 35]. 2. Place the protective cover onto the pressure relief device such that the drill holes for the fixing screws in the protective cover are aligned with the corresponding threaded holes in the device.

  • Page 30: Mounting Pressure Relief Device With Od Protective Cover

    5 Mounting 5.2 Mounting pressure relief device with OD protective cover In order to mount the device, you must open it. Only close it again once mounted. Figure 7: Mounting pressure relief device with OD protective cover 1 4 housing screws M8x100, wrench 2 Protective cover size 13 3 Signal pin, wrench size 12...
  • Page 31 5 Mounting Mounting the device 1. Place the mounting seal ring (delivered as an option) under the device, see Dimensions with OD protective cover [►Section 12.2, Page 56]. 2. Mount the device onto the counter flange on the transformer / on-load tap- changer by inserting 6 screws M12 or 1/2"...
  • Page 32 5 Mounting NOTICE!  Protect the o-ring seal between the device and protective cover; therefore, during all intermediate steps, only position the protective cover lightly and do not press down. Figure 9: Protecting the o-ring seal 3. Lower the protective cover parallel to the device flange and place lightly on the spring assembly, without pressing the protective cover over the o- ring.
  • Page 33 5 Mounting 4. Insert the 4 housing screws into the intended holes and turn the protective cover gently around its axis until the screws engage in the threads in the counter bearing. NOTICE!  Do not tilt or jam the protective cover. Tighten the screws slightly crosswise several times to prevent that the protective cover does not tilt or jam whilst it is being lowered.
  • Page 34 5 Mounting Mounting oil drainage unit Figure 12: Mounting oil drainage unit 1 3 hexagon screws M12x40 with 2 Counter flange of the drainage spring washers and washers (sup- unit, dimensions, see [►Section plied) 12.2, Page 56] 3 Plastic cap as transport lock 4 O-ring 95x3 (supplied) ►...

  • Page 35: Electrically Connecting The Pressure Relief Device

    5 Mounting Establishing operational readiness 1. Screw the signal pin cap onto the signal pin using 2 open-ended wrenches, wrench size 12 and 32, with max. torque = 8 Nm. Figure 13: Mounting signal pin 2. Push the signal pin into the device as far as it will go. 3.

  • Page 36: Connecting Cable Screw Connections

    5 Mounting Connecting the micro-switches (optional) There are a variety of versions for connecting the optionally installed micro- switches: ▪ Cable screw connections [►Section 5.3.1, Page 36] ▪ Terminal box [►Section 5.3.2, Page 38] ▪ Plug (ANSI or Westinghouse) [►Section 5.3.3, Page 39] Each micro-switch is designed as an electrically isolated normally open and normally closed contact.
  • Page 37 5 Mounting Figure 15: Connecting micro-switches in the pressure relief device with OD protective cover 1 Micro-switch 1 2 Micro-switch 2 (if not installed, the outer cable screw connection is re- placed with a dummy plug) ► Open standard protective cover [►Section 5.1, Page 27]. ð...

  • Page 38: Connecting The Cable To The Terminal Box

    5 Mounting 6. First tighten the inner cable screw connection hand-tight, and then the outer cable screw connection, and ensure that the cables and braided leads remain loose and without tension, and that they are not twisted. 7. Tighten all cable screw connections with max. torque = 5.0 Nm. 8.

  • Page 39: Connecting The Plug Connector (Ansi Or Westinghouse)

    5 Mounting 5. Close the cable screw connection with max. torque = 6.7 Nm. 6. If present, proceed in the same way for the second cable screw connec- tion. 7. Close the cover of the terminal box. 5.3.3 Connecting the plug connector (ANSI or Westinghouse) Before connecting the device, check that the socket connection cable matches the plug on the device.
  • Page 40 5 Mounting Figure 18: Pin assignment of the Westinghouse socket connection cable in plan view 1 1 Micro-switch 2 2 Micro-switches Wire colors of the Pin 1: black Pin 1: red Pin 2: white supplied cable: Pin 4: green Pin 5: blue Pin 4: black Pin 6: white Pin 6: orange...

  • Page 41: Commissioning

    6 Commissioning Check that the protective relay is functioning correctly before commissioning the transformer / on-load tap-changer. You will find a description of the func- tion test in the following. A case where one micro-switch of the pressure relief device is wired to the tripping circuit of the circuit breaker that de-energizes the transformer in the event of an error is used as an example.
  • Page 42 6 Commissioning 13. If the fire extinguishing unit was deactivated prior to the test, recommis- sion this in accordance with the manufacturer operating instructions. ð Once this function test has been performed, the transformer / on-load tap- changer can be commissioned. BA5789879-01 EN...

  • Page 43: Operation

    7 Operation The following section describes how you can monitor and restore the operat- ing state of the device. 7.1 Pressure relief device operating state The operating state of the pressure relief device can be determined exter- nally from the position of the signal pin and from the position of the sema- phore (optional): Figure 19: Operating positions of the signal pin and the semaphore (optional) 1 Operation...

  • Page 44: Venting The Pressure Relief Device

    7 Operation If the pressure relief device has tripped, the signal pin remains in the alarm position even when the pressure in the transformer / on-load tap-changer has normalized again. If the micro-switches inside the housing are con- nected, a signal is sent simultaneously to the control room. ►...
  • Page 45 7 Operation 2. Remove the protective cover of the pressure relief device see Opening the device with standard protective cover [►Section 5.1, Page 27] or with OD protective cover [►Section 5.2, Page 30]. 3. Carefully open the vent screw a few turns using a wrench of wrench size 10 or a screwdriver without unscrewing it completely.

  • Page 46: Maintenance And Inspection

    ▪ Visual inspection of the flange ▪ Visual inspection of the switches In the event of questions or irregularities, contact the Technical Service de- partment: Maschinenfabrik Reinhausen GmbH MR Service & Complaint Falkensteinstrasse 8 93059 Regensburg, Germany E-mail: service@reinhausen.com or complaint@reinhausen.com BA5789879-01 EN...

  • Page 47: Fault Elimination

    9 Fault elimination This chapter describes how to eliminate simple operating faults. 9.1 Testing the tripping circuit and reason for tripping If the signal pin is in the operation position, the pressure relief device has not tripped. If a micro-switch has, nevertheless, issued a signal, the error can lie in the tripping circuit.

  • Page 48: Disposal

    10 Disposal Observe the national disposal regulations in the country of use. BA5789879-01 EN...

  • Page 49: Technical Data

    11 Technical data Operating conditions MESSKO® MPREC® Site of operation Indoors and outdoors, tropicalized Operating temperature Ambient tem- -50°C...+80°C (mechanical version perature: only) -40°C...+80°C (version with micro- switches) Oil tempera- -30°C...+120°C ture: Storage temperature -50°C...+80°C Degree of protection IP65 in accordance with IEC 60529 (terminal box, cable IP66 in accordance with IEC 60529 available as an op- screw connections, mi-...
  • Page 50 11 Technical data Materials MESSKO® MPREC® OD protective cover Seawater-proof aluminum casting with powder coating RAL 7033 or RAL 7038; sealing lip in the valve plate in- cluded in the scope of delivery, see [►Section 3.3.1, Page 18] Offshore version available as an option: ▪...
  • Page 51 11 Technical data Dimensions MESSKO® MPREC® Height (in tripped state) Max. 234.5 mm [9.23"] standard protective cover without semaphore Max. 340 mm [13.39"] standard protective cover with semaphore Max. 246 mm [9.96"] OD protective cover without sema- phore Max. 342 mm [13.46"] OD protective cover with sema- phore Mounting seal ring Available as an option;...
  • Page 52 11 Technical data Connection via cable screw connections Connection terminals Single-wire: 0.5...2.5 mm , AWG 20-10; braided leads with ferrule: 0.5...1.5 mm , AWG 20-15 Cable screw connections IP65: M20x1.5 for cable diameters 8...15 mm; connec- tion cable not included in delivery IP66 and offshore applications: M20x1.5 for cable diam- eters 5...14 mm;...

  • Page 53: Appendix

    12 Appendix 12.1 Dimensions with standard protective cover Figure 21: MPREC with standard protective cover – view from below BA5789879-01 EN...
  • Page 54 12 Appendix Figure 22: Side view with signal positions 1 Alarm position 2 Operation position 3 Mounting seal ring BA5789879-01 EN...
  • Page 55 12 Appendix Figure 23: Connection options for the micro-switches; detail: venting 1 Terminal box 2 Vent screw 3 Connection via cable screw con- 4 ANSI plug nection (gland) BA5789879-01 EN...

  • Page 56: Dimensions With Od Protective Cover

    12 Appendix 12.2 Dimensions with OD protective cover Figure 24: Side view with signal positions 1 Alarm position 2 Operation position BA5789879-01 EN...
  • Page 57 12 Appendix Figure 25: View from below and from the side in the OPERATION position 1 Dimensions in the alarm position 2 Dimensions in the alarm position 342 mm [13.47"] 246 mm [9.69"] BA5789879-01 EN...
  • Page 60 Messko GmbH Gewerbegebiet An den Drei Hasen Messko-Platz 1 61440 Oberursel, Germany +49 (0)6171 6398 0 +49 (0)6171 6398 98 messko-info@reinhausen.com www.reinhausen.com/messko ® ® BA5789879-01 EN - MESSKO MPREC F0358701 - 07/19 - Messko GmbH 2019 THE POWER BEHIND POWER.

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