MR MESSKO MSAFE Operating Instructions Manual
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MR MESSKO MSAFE Operating Instructions Manual

Buchholz relay
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Buchholz relay
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MESSKO
MSAFE
Operating instructions
7232312/00 EN

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  • Page 1 Buchholz relay ® MESSKO MSAFE Operating instructions 7232312/00 EN...

  • Page 2: Table Of Contents

    Table of contents Introduction................ 5 Manufacturer.................. 5 Safekeeping.................. 5 Notation conventions ...............  5 1.3.1 Hazard communication system .............. 5 1.3.2 Information system.................. 7 1.3.3 Instruction system .................. 7 1.3.4 Typographic conventions ................ 8 Safety.................. 9 Intended use .................. 9 Fundamental safety instructions ............  10 Personnel qualification..............
  • Page 3 Table of contents Electrically connecting the dry-reed magnetic switches .... 31 Commissioning.............. 35 Venting the Buchholz relay ............ 35 Leak test .................. 35 Function tests ................ 36 6.3.1 Loss of insulating fluid................ 36 6.3.2 Gas accumulation in the insulating fluid.............  37 6.3.3 Insulating fluid flow speed too high ............
  • Page 4 Table of contents Glossary ................ 56 7232312/00 EN...

  • 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. This technical document is intended solely for specially trained and autho- rized personnel. 1.1 Manufacturer The product is manufactured by: Messko GmbH Gewerbegebiet An den Drei Hasen Messko-Platz 1...
  • Page 6 1 Introduction WARNING Type of danger! Source of the danger and its consequences. ► Action ► Action 1.3.1.2 Embedded warning information Embedded warnings refer to a particular part within a section. These warn- ings apply to smaller units of information than the warnings relating to sec- tions.

  • Page 7: Information System

    1 Introduction Pictograms warn of dangers: Pictogram Definition Warning of a danger point Warning of dangerous electrical voltage Warning of combustible substances Warning of a tipping hazard Warning of a hot surface Table 2: Pictograms used in warning notices 1.3.2 Information system Information is designed to simplify and improve understanding of particular procedures.

  • Page 8: Typographic Conventions

    1 Introduction Single-step instructions Instructions which consist of only a single process step are structured as fol- lows: Aim of action ü Requirements (optional). ► Step 1 of 1. ð Result of step (optional). ð Result of action (optional). Multi-step instructions Instructions which consist of several process steps are structured as follows: Aim of action ü...

  • Page 9: 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 file through carefully to familiarize yourself with the product. ▪ This technical file is a part of the product. ▪...

  • Page 10: Fundamental Safety Instructions

    2 Safety 2.2 Fundamental safety instructions To prevent accidents, disruptions and damage as well as unacceptable ad- verse effects on the environment, those responsible for transport, installa- tion, operation, maintenance and disposal of the product or parts of the prod- uct must ensure the following: Personal protective equipment Loosely worn or unsuitable clothing increases the danger of becoming...
  • Page 11 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 12 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 13 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 14 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. 7232312/00 EN...

  • Page 15: Product Description

    3 Product description This chapter contains an overview of the design and function of the product. 3.1 Scope of delivery The product is packaged with protection against moisture and is delivered as follows: ▪ Buchholz relay ▪ Technical documents ▪ Air pump (optional) ▪...
  • Page 16 3 Product description magnetic switch pipe and triggering a signal. The lower float gauge remains unaffected, because as of a certain volume the gas flows to the oil conserva- tor via the pipe. Figure 1: Gas in the Buchholz relay 1 Upper float gauge 2 Lower float gauge 3 Insulating fluid 4 Gas...
  • Page 17 3 Product description Loss of insulating fluid As the fluid level drops, the upper float gauge lowers first, activating a con- tact in the dry-reed magnetic switch pipe and triggering a signal. As the fluid level drops further, the lower float gauge also lowers, activating another con- tact in the dry-reed magnetic switch pipe and triggering another signal.
  • Page 18 3 Product description Insulating fluid flow speed too high If the specified flow speed towards the oil conservator is exceeded, a flap valve moves in the direction of flow, activating a contact in the dry-reed mag- netic switch pipe and triggering a signal. Figure 3: Flow speed too high 1 Upper float gauge 2 Lower float gauge...

  • Page 19: Design/Versions

    3 Product description 3.3 Design/versions The Buchholz relay is equipped with 2 float gauges and 1 flap valve, and is 1/2“ available with a G 1 thread connection or flange connections for nominal pipe diameters of DN25, DN50 or DN80. The Buchholz relay can be equipped with a maximum of 4 dry-reed mag- netic switches (N/C contact, N/O contact, changeover contact) which you can connect electrically via the terminal box.
  • Page 20 3 Product description 7 Flange (also on the opposite side) 8 Connection for pneumatics testing (optional) 9 Gas extraction valve 10 Test button with cover sleeve 7232312/00 EN...

  • Page 21: 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 22 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 23: 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 24: Mounting

    5 Mounting DANGER Electric shock! Danger of death due to electrical voltage when assembling/ disassembling the device. ► Switch off transformer on high-voltage side and low-voltage side. ► Lock transformer to prevent unintentional restart. ► Make sure that everything is de-energized. ►...

  • Page 25: Gasket Requirements

    5 Mounting 5.2 Gasket requirements Observe the following information when selecting the gaskets: ▪ Ensure that the gasket and sealing groove meet the latest technical stan- dards. ▪ Use new and clean gaskets. ▪ Use O-rings or flat gaskets. ▪ Never use paper gaskets. ▪...
  • Page 26 5 Mounting or transformer. A positive inclination of up to 5° from the horizontal is per- mitted in the direction toward the conservator. An inclination of up to 5° from the vertical to either side is permitted. Figure 5: Necessary incline of the pipe and permitted inclination of the Buchholz relay when us- ing the Buchholz relay as a protective device for the on-load tap-changer ▪...
  • Page 27 5 Mounting 2. Remove the plastic cover on both flanges. Figure 6: Plastic cover 3. Remove the cover sleeve from the test button, remove the colored plug and reattach the cover sleeve to the test button. Figure 7: Plugs 7232312/00 EN...
  • Page 28 5 Mounting 4. If the Buchholz relay is equipped with the connection for pneumatics test- ing: Remove the union nut from the connection. Position the locking cap on the connection, screw on hand-tight and then tighten with max. one half turn. Figure 8: Locking cap for connection for pneumatics testing 5.
  • Page 29 5 Mounting NOTICE!  Damage to Buchholz relay housing due to screws that are too long. Fasten the Buchholz relay onto the pipe using suitable screws, nuts and gaskets in such a way that the printed arrow is pointing in the direc- tion of the oil conservator (direction of insulating fluid flow).
  • Page 30 5 Mounting NOTICE!  A residual distance between the flanges caused by a deviation in evenness can cause damage to the flanges. Tighten screws with 10% of the target torque and ensure that there is no gap between the flanges. If there is a gap, repair the affected pipe flanges or, if necessary, detach and re-weld them so that there is no longer a gap.

  • Page 31: Electrically Connecting The Dry-Reed Magnetic Switches

    5 Mounting 11. Retighten all screws with the full target torque until the screws can no longer be turned under the full torque. Figure 12: Tighten the screws crosswise 5.4 Electrically connecting the dry-reed magnetic switches DANGER Electric shock! Risk of fatal injury due to electrical voltage when connecting the device.
  • Page 32 5 Mounting The dry-reed magnetic switches installed in the Buchholz relay are designed as N/C contacts, N/O contacts or changeover contacts. You can connect these electrically via a terminal strip in the terminal box. The cables are not included in the scope of delivery. 1.
  • Page 33 5 Mounting 4. Connect the strands to the terminal strip. The connection diagram can also be found on the inside of the terminal box cover. Figure 13: Connection diagram 1 N/C contacts 2 N/O contacts 3 Changeover contacts 5. Tighten the cable gland (wrench size 30, torque 6.7 Nm). 6.
  • Page 34 5 Mounting 7. Ground the Buchholz relay using the grounding cable with ring-type cable lug (grounding screw M6, wrench size 10, torque 6 Nm). The aluminum side of the CUPAL washer must be facing the Buchholz relay housing. 7232312/00 EN...

  • Page 35: Commissioning

    6 Commissioning Prior to commissioning the transformer, vent the Buchholz relay and perform the checks listed in the following. If anything is unclear regarding the checks or troubleshooting, please contact Messko GmbH [►Section 1.1, Page 5]. 6.1 Venting the Buchholz relay WARNING Danger of explosion and danger of poisoning! Explosive gases in the Buchholz relay can deflagrate or ex-...

  • Page 36: Function Tests

    6 Commissioning 6.3 Function tests WARNING Danger of explosion and danger of poisoning! Explosive gases in the Buchholz relay can deflagrate or ex- plode and result in death or severe injuries. Inhaling the gases released can lead to poisoning or suffocation. ►...

  • Page 37: Gas Accumulation In The Insulating Fluid

    6 Commissioning 2. Press the test button down and release. ð The upper and lower float gauges are pressed down and the dry-reed magnetic switches of both float gauges issue a signal. ð The upper float gauge returns to its starting position. The upper float gauge signal stops.

  • Page 38: Insulating Fluid Flow Speed Too High

    6 Commissioning 5. Position the locking cap on the connection for pneumatics testing, screw on hand-tight and then tighten with max. one half turn (open-end wrench, wrench size 14). ð The test is complete. 6.3.3 Insulating fluid flow speed too high This test simulates an excessive insulating fluid flow speed.

  • Page 39: Operation

    7 Operation 7.1 Alarm table N/O contact N/C contact Changeover Note (NO) (NC) contact (CO) Normal operat- ing state. All contacts in starting posi- tion. Gas accumula- Check the in- tion in the insu- sulating fluid lating fluid. level via in- Contacts S2 spection win- and S4 (op-...

  • Page 40: Releasing Blocked Flap Valve

    7 Operation 7.2 Releasing blocked flap valve If the Buchholz relay is equipped with the reset function, the flap valve is blocked if there is a loss of insulating fluid or the flow speed is too high. In these cases, you have to release the flap valve manually. 1.

  • Page 41: Maintenance And Inspection

    3. Check the tightness of the flange connection [►Section 6.2, Page 35]. 4. Check that the device is functioning correctly [►Section 6.3, Page 36]. In the event of questions or irregularities, contact Technical Service: Maschinenfabrik Reinhausen GmbH MR Service & Complaint Falkensteinstrasse 8 93059 Regensburg, Germany E-mail: service@reinhausen.com or complaint@reinhausen.com 8.1 Draining the insulation fluid...

  • Page 42: Disposal

    9 Disposal Observe the national disposal regulations in the country of use. 7232312/00 EN...

  • Page 43: Technical Data

    10 Technical data Basic materials Housing / terminal box Cast aluminum, RAL 7033 or 7038 (similar to ANSI 70 light gray), powder-coated; seawater-re- sistant version (offshore) upon request Inspection window Hardened glass with UV filter Specifications Setup Indoors and outdoors, tropic-proof Ambient air temperature -50°C…+80°C Storage temperature...
  • Page 44 10 Technical data Dry-reed magnetic switches Max. switched current AC/DC N/C contact: 2 A N/O contact: 2 A Changeover contact: 1 A Min. switched current 50 mA=1.2 W/24 V 4.8 mA=1.2 W/250 V Max. continuous current AC/DC N/C contact: 3 A N/O contact: 3 A Changeover contact: 2 A Max. AC switching capacity N/C contact: 1.2 VA…400 VA N/O contact: 1.2 VA…400 VA Changeover contact: 1.2 VA…200 VA...

  • Page 45: Drawings

    11 Drawings 7232312/00 EN...
  • Page 46 TRANSFORMER ACCESSORIES   SERIAL NUMBER DIMENSION IN mm  DIMENSION TABLE SHEET MATERIAL NUMBER EXCEPT AS    MSAFE-BUCHHOLZ RELAY 101293190M NOTED...
  • Page 47 TRANSFORMER ACCESSORIES   SERIAL NUMBER DIMENSION IN mm  MSAFE-BUCHHOLZ RELAY SHEET MATERIAL NUMBER EXCEPT AS    MBR25-6 and MBR25-16 101289500M NOTED...
  • Page 48 TRANSFORMER ACCESSORIES   SERIAL NUMBER DIMENSION IN mm  MSAFE-BUCHHOLZ RELAY SHEET MATERIAL NUMBER EXCEPT AS    MBR25-G 101289690M NOTED...
  • Page 49 TRANSFORMER ACCESSORIES   SERIAL NUMBER DIMENSION IN mm MSAFE-BUCHHOLZ RELAY  SHEET MATERIAL NUMBER EXCEPT AS   MBR50 -6/4 AND 16/4  101291380M NOTED...
  • Page 50 TRANSFORMER ACCESSORIES   SERIAL NUMBER DIMENSION IN mm  MSAFE-BUCHHOLZ RELAY SHEET MATERIAL NUMBER EXCEPT AS    MBR50-6/6 101291570M NOTED...
  • Page 51 TRANSFORMER ACCESSORIES   SERIAL NUMBER DIMENSION IN mm  MSAFE-BUCHHOLZ RELAY SHEET MATERIAL NUMBER EXCEPT AS    MBR80-16/4 101292990M NOTED...
  • Page 52 TRANSFORMER ACCESSORIES   SERIAL NUMBER DIMENSION IN mm  MSAFE-BUCHHOLZ RELAY SHEET MATERIAL NUMBER EXCEPT AS    MBR80-6/6 101292570M NOTED...
  • Page 53 TRANSFORMER ACCESSORIES   SERIAL NUMBER DIMENSION IN mm  MSAFE-BUCHHOLZ RELAY SHEET MATERIAL NUMBER EXCEPT AS    MBR80 -16/8 101292340M NOTED...
  • Page 54 TRANSFORMER ACCESSORIES   SERIAL NUMBER DIMENSION IN mm  MSAFE-BUCHHOLZ RELAY SHEET MATERIAL NUMBER EXCEPT AS    MBR80 - CH 101292670M NOTED...
  • Page 55 TRANSFORMER ACCESSORIES   SERIAL NUMBER DIMENSION IN mm  MSAFE-BUCHHOLZ RELAY SHEET MATERIAL NUMBER EXCEPT AS    MBR80-QU 101292980M NOTED...
  • Page 56 Glossary Ambient air temperature Operating temperature Temperature range of the air in the sur- The device is installed on the equip- roundings of the equipment in operation ment in accordance with the specifica- on which the device is installed. tions in these operating instructions and is in operation together with the equip- ment taking the ambient influences into Insulating fluid temperature...
  • Page 60 Messko GmbH Gewerbegebiet An den Drei Hasen Messko-Platz 1 61440 Oberursel, Germany +49 (0)6171 6398 0 messko-info@reinhausen.com www.reinhausen.com/messko ® 7232312/00 EN - MESSKO MSAFE - F0384900 - 02/21 - Messko GmbH 2021 THE POWER BEHIND POWER.

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