MD1701 SeriesTest BlocksInstruction Manual NR Electric Co., Ltd.PrefaceMD1701 Series Test Blocks Instruction ManualiDate: 2013-07-03PrefaceIntroductionThis guide and the relevant operating or service manual documentation for the equipment provide full information on safe handling, commissioning and testing of this equipment.Documentation for equipment ordered from NR is dispatched separately from manufactured goods and may not be received at the same time. Therefore, this guide is provided to ensure that printed information normally present on equipment is fully understood by the recipient.Before carrying out any work on the equipment, the user should be familiar with the contents of this manual, and read relevant chapter carefully.This chapter describes the safety precautions recommended when using the equipment. Before installing and using the equipment, this chapter must be thoroughly read and understood.Health and SafetyThe information in this chapter of the equipment documentation is intended to ensure that equipment is properly installed and handled in order to maintain it in a safe condition.When electrical equipment is in operation, dangerous voltages will be present in certain parts of the equipment. Failure to observe warning notices, incorrect use, or improper use may endanger personnel and equipment and cause personal injury or physical damage. Before working in the terminal strip area, the equipment must be isolated.Proper and safe operation of the equipment depends on appropriate shipping and handling, proper storage, installation and commissioning, and on careful operation, maintenance and servicing. For this reason, only qualified personnel may work on or operate the equipment. Qualified personnel are individuals who:● Are familiar with the installation, commissioning, and operation of the equipment and of thesystem to which it is being connected; ● Are able to safely perform switching operations in accordance with accepted safetyengineering practices and are authorized to energize and de-energize equipment and to isolate, ground, and label it; ● Are trained in the care and use of safety apparatus in accordance with safety engineeringpractices; ● Are trained in emergency procedures (first aid).Instructions and WarningsThe following indicators and standard definitions are used:PrefaceMD1701 Series Test Blocks Instruction Manual iiDate: 2013-07-03DANGER!It means that death, severe personal injury, or considerable equipment damage will occur if safety precautions are disregarded.WARNING!It means that death, severe personal, or considerable equipment damage could occur if safety precautions are disregarded.CAUTION!It means that light personal injury or equipment damage may occur if safety precautions are disregarded. This particularly applies to damage to the device and to resulting damage of the protected equipment.WARNING!The firmware may be upgraded to add new features or enhance/modify existing features, please make sure that the version of this manual is compatible with the product in your hand.WARNING!During operation of electrical equipment, certain parts of these devices are under high voltage. Severe personal injury or significant equipment damage could result from improper behavior. Only qualified personnel should work on this equipment or in the vicinity of this equipment. These personnel must be familiar with all warnings and service procedures described in this manual, as well as safety regulations.In particular, the general facility and safety regulations for work with high-voltage equipment must be observed. Noncompliance may result in death, injury, or significant equipment damage.DANGER!Never allow the current transformer (CT) secondary circuit connected to this equipment to be opened while the primary system is live. Opening the CT circuit will produce a dangerously high voltage.WARNING!Exposed terminalsDo not touch the exposed terminals of this equipment while the power is on, as the high voltage generated is dangerousPrefaceMD1701 Series Test Blocks Instruction ManualiiiDate: 2013-07-03● Residual voltageHazardous voltage can be present in the DC circuit just after switching off the DC power supply. It takes a few seconds for the voltage to discharge.CAUTION!● EarthThe earthing terminal of the equipment must be securely earthed ● Operating environmentThe equipment must only be used within the range of ambient environment detailed in the specification and in an environment free of abnormal vibration. ● RatingsBefore applying AC voltage and current or the DC power supply to the equipment, check that they conform to the equipment ratings. ● Printed circuit boardDo not attach and remove printed circuit boards when DC power to the equipment is on, as this may cause the equipment to malfunction. ● External circuitWhen connecting the output contacts of the equipment to an external circuit, carefully check the supply voltage used in order to prevent the connected circuit from overheating. ● Connection cableCarefully handle the connection cable without applying excessive force.CopyrightVersion: R1.00P/N: EN_CSMK1700.0086.0001Copyright © NR 2013. All rights reservedNR ELECTRIC CO., LTD.69 Suyuan Avenue. Jiangning, Nanjing 211102, China Tel: +86-25-87178185, Fax: +86-25-87178208 Website: , Email: NR_TechSupport@We reserve all rights to this document and to the information contained herein. Improper use in particular reproduction and dissemination to third parties is strictly forbidden except where expressly authorized.The information in this manual is carefully checked periodically, and necessary corrections will be included in future editions. If nevertheless any errors are detected, suggestions for correction or improvement are greatly appreciated.We reserve the rights to make technical improvements without notice.PrefaceMD1701 Series Test Blocks Instruction Manual ivDate: 2013-07-03Documentation StructureThe manual provides a functional and technical description of this product and a comprehensive set of instructions for the use and application of MD1701 series test blocks. All contents provided by this manual are summarized as below:1 IntroductionBriefly introduce the application, functions and features about this product.2 Technical DataIntroduce the technical data about this product.3 ApplicationIntroduce the applications and functions of this product.4 InstallationIntroduce relevant sizes and panel mounting details of this product.5 Manual Version HistoryList the instruction manual version and the modification history records.Table of ContentsMD1701 Series Test Blocks Instruction ManualvDate: 2013-07-03Table of ContentsPreface (i)Introduction ................................................................................................................ i Health and Safety ...................................................................................................... i Instructions and Warnings (i)Table of Contents .................................................................................. v 1 Introduction . (1)1.1 Overview .............................................................................................................. 1 1.2 Glossary .. (2)2 Technical Data (3)2.1 Electrical Specifications (3)2.1.1 Maximum Working Current (Continuously) ............................................................................. 3 2.1.2 Maximum Working Current (for 1s) ......................................................................................... 3 2.1.3 Maximum Working Voltage...................................................................................................... 3 2.1.4 Contact Resistance .. (3)2.2 Mechanical Specifications ................................................................................. 3 2.3 Flame Retardation .............................................................................................. 3 2.4 Ambient Temperature and Humidity Range ..................................................... 3 2.5 Type Tests .. (3)2.5.1 Mechanical Tests ..................................................................................................................... 4 2.5.2 Electrical Tests . (4)3 Application (5)3.1 Overview .............................................................................................................. 5 3.2 Function . (11)3.2.1 CT Shorting Links (CJ2T/CJ4T) (12)Table of ContentsMD1701 Series Test Blocks Instruction Manual viDate: 2013-07-033.2.2 Test Blocks (MD1701-01/MD1701-02) and Multi-finger Test Plug (CJ28T) .......................... 12 3.2.3 Single-finger Test Plug (YJ2T) . (13)4 Installation (17)4.1 Mechanical Installation .................................................................................... 17 4.2 Multi-finger Test Plug (CJ28T) ......................................................................... 18 4.3 Single-finger Test Plug (YJ2T) . (18)5 Manual Version History (19)1 IntroductionMD1701 Series Test Blocks Instruction Manual1Date: 2013-07-031 Introduction1.1 OverviewMD1701 series products (including test blocks, test plugs and accessories) cooperate with protection relays to provide online monitoring/testing for power system protection schemes. With the application of MD1701 series test blocks, operation security can be ensured. Moreover, monitoring, isolation and secondary injection testing can be simplified and quickly performed. Available models of MD1701 series products are listed as below: MD1701-01MD1701-01 is a standard test block. Terminal 13 and terminal 14 of MD1701-01 can be used to connect the main DC auxiliary supply to the protection scheme or relay through this circuit. MD1701-01 is shown in the following figure.Figure 1.1-1 MD1701-01 test block1 IntroductionMD1701 Series Test Blocks Instruction Manual 2Date: 2013-07-03● MD1701-02MD1701-02 is a special test block designed for use in busbar protection schemes. Terminal 13 and terminal 14 of MD1701-02 can be used for CT connections. ● CJ28TCJ28T is a multi-finger test plug. ● YJ2TYJ2T is a single-finger test plug. ● CJ4TCJ4T is a four-terminal CT shorting link. ● CJ2TCJ2T is a two-terminal CT shorting link.Note! CT shorting links (CJ2T and CJ4T) must cooperate with multi-finger test plug (CJ28T).Note! Terminal 13 and terminal 14 on MD1701-01 test block and CJ28T multi-finger test plug must not be used for CT connections since they may present a safety hazard.1.2 GlossaryTable 1.2-1 Glossary2 Technical Data2.1 Electrical Specifications2.1.1 Maximum Working Current (Continuously)2.1.2 Maximum Working Current (for 1s)2.1.3 Maximum Working Voltage2.1.4 Contact Resistance2.2 Mechanical Specifications2.3 Flame Retardation2.4 Ambient Temperature and Humidity Range2.5 Type TestsMD1701 Series Test Blocks Instruction Manual 42.5.1 Mechanical Tests2.5.2 Electrical Tests3 Application3.1 OverviewMD1701 series products can be installed at secondary sides of CTs/VTs, or installed in the signal sampling circuit of IEDs in power system protection schemes. Shorting links of secondary sides of CTs, online monitoring/testing can be performed.The MD1701 cover can provide protection from electric shock hazard. There are 2 covers as shown in the following 2 figures.As shown in the following figure, the 1st cover (with a shorting link for terminal 13 and terminal 14) is designed for MD1701-01.Figure 3.1-1 Cover for MD1701-01 test block (with a shorting link for terminal 13 and terminal 14)As shown in the following figure, the 2nd cover (without shorting link) is designed for MD1701-02.MD1701 Series Test Blocks Instruction Manual 6Figure 3.1-2 Cover for MD1701-02 test block (without shorting link)Main functions of MD1701 series products are listed as below:1) During the operation of MD1701-01/MD1701-02 test block (with cover), each circuitcomprises of a pair of internal contacts which are normally sprung together to complete the circuit link through the block when the associated protective equipment is in normal service. For MD1701-01 with a cover as shown in Figure 3.1-1, terminal 13 and terminal 14 are connected by a shorting link of the cover.For MD1701-02 with a cover as shown in Figure 3.1-2, terminal 13 and terminal 14 are not connected by the cover.Please refer to the following figure for the application of MD1701-01.Figure 3.1-3 Application of MD1701-01 test block2) By removing the front cover of MD1701-01/MD1701-02, access to internal circuits for testingpurposes can be achieved.A metallic probe secured to the inside face of the MD1701-01 cover is automaticallywithdrawn when the cover is removed, so interrupting the circuit between terminal 13 and terminal 14. By routing the main DC auxiliary supply to the protection scheme or relay through this circuit, removal of the test block cover will thereby prevent maloperation of the protection during the ensuing tests.This link is not provided on the MD1701-02 because the contacts between terminals 13 and14 are normally closed.Please refer to the following figure for this function.MD1701 Series Test Blocks Instruction Manual 8Figure 3.1-4 MD1701-01/MD1701-02 test block (Without cover)3) Plug-link can be used to short link corresponding secondary CT circuit. Attach a plug-link toCJ28T multi-finger test plug firstly, and then insert CJ28T into MD1701-01/MD1701/02 test block.As shown in the following figure, terminal 09 and terminal 10 are linked by the plug-link, now the circuit between terminal 13 and terminal 14 will be interrupted. Therefore, the plug-link can be used for testing, or used for potential monitoring.Figure 3.1-5 Application of plug-link and CJ28T multi-finger test plug4) CJ4T CT shorting link can be used to short link 4 current circuits of CJ28T;CJ2T CT shorting link can be used to short link 2 current circuits of CJ28T.As shown in the following figure, attach a CJ4T or CJ2T to dedicated position of CJ28T, insert CJ28T into MD1701-01/MD1701-02 test block, now inadvertent open circuit of the dedicated position can be avoided.MD1701 Series Test Blocks Instruction Manual 10Figure 3.1-6 Application of CT shorting link and CJ28T multi-finger test plugPlease refer to the following figure for four-terminal CT shorting link (CJ4T). Figure 3.1-7 Four-terminal CT shorting link (CJ4T)Please refer to the following figure for two-terminal CT shorting link (CJ2T).Figure 3.1-8 Two-terminal CT shorting link (CJ2T)5) As shown in the following figure, the YJ2T single-finger test plug can be inserted intoindividual test positions in the test block, so as to perform potential monitoring of designated circuit. Moreover, current/voltage measurements can also be provided.Figure 3.1-9 Application of YJ2T single-finger test plug3.2 FunctionMD1701-01/MD1701-02 test block cooperates with CJ28T multi-finger test plug, so as to provide online monitoring/testing function.Note! Before use, the insulation of the flying leads should be visually checked for damage.MD1701 Series Test Blocks Instruction Manual 12Note! The continuity of CJ28T test plug leads and the state of their insulation should bechecked before insertion into the MD1701-01/MD1701-02 test block.3.2.1 CT Shorting Links (CJ2T/CJ4T)When CT shorting links (CJ2T and CJ4T) cooperate with multi-finger test plug (CJ28T) to short-link different circuits, please check the short-link position carefully, and then plug CJ2T/CJ4T and CJ28T to corresponding test block.Please refer to Figure 3.1-7 for CJ4T (Four-terminal CT shorting link);Please refer to Figure 3.1-8 for CJ2T (Two-terminal CT shorting link).3.2.2 Test Blocks (MD1701-01/MD1701-02) and Multi-finger Test Plug (CJ28T)Note! Before using CJ28T multi-finger test plug, please confirm you can understand thewarnings printed on CJ28T. The printed warnings are listed as below:Note:Please confirm CT secondary windings are short-circuited and test supplies are isolated BEFORE the plug is inserted!Please refer to the diagram for connections.Note! Before using MD1701-01/MD1701-02 test block and CJ28T multi-finger test plug,please confirm you can understand warnings and introductions in this section.Note! Terminal 13 and terminal 14 on MD1701-01 test block and CJ28T multi-finger testplug must not be used for CT connections since they may present a safety hazard.If MD1701-02 test block cooperates with CJ28T, terminal 13 and terminal 14 of MD1701-02 must not be used for CT connections since this will present a safety hazard. The reason for this is that the associated CJ28T test plug contact finger is shorter than the others. This would result in an open circuit path on the MD1701-02.Note! When CJ28T is inserted into MD1701-01/MD1701-02 test block, the screws ofCJ28T must be tightened to ensure CJ28T is inserted into the test block firmly.When MD1701-01/MD1701-02 test block is installed to proper position, an earth connection should be made to the case of this product. Moreover, the cover (with a shorting link for terminal 13 and terminal 14) should be connected to MD1701-01 firmly, while the other cover (without shorting link) should be connected to MD1701-02 firmly.MD1701-01/MD1701-02 test block carries 14 circuits, each of which is brought out to separate pairs of terminals at the rear of the case.MD1701 Series Test Blocks Instruction Manual13Date: 2013-07-03 Each circuit comprises of a pair of internal contacts which are normally sprung together to complete the circuit link through the block when the associated protective equipment is in normal service.By removing the front cover, access to internal circuits for testing purposes can be achieved. A metallic probe secured to the inside face of the MD1701-01 cover is automatically withdrawn when the cover is removed, so interrupting the circuit between terminal 13 and terminal 14. By routing the main DC auxiliary supply to the protection scheme or relay through this circuit, removal of the test block cover will thereby prevent maloperation of the protection during the ensuing tests.This link is not provided on the MD1701-02 because the contacts between terminals 13 and 14 are normally closed.Insertion of CJ28T test plug can open circuits of the contacts which connect terminal pairs, allowing testing to proceed.CJ28T multi-finger test plug carries twenty-eight 4mm sockets. Each socket is identified by a number which corresponds to the numbered case terminal to which the socket is connected when the plug is inserted. CJ28T is shown in the following figure.Figure 3.2-1 CJ28T multi-finger test plug3.2.3 Single-finger Test Plug (YJ2T)As shown in the following figure, the YJ2T single-finger test plug can be inserted into individualMD1701 Series Test Blocks Instruction Manual 14Date: 2013-07-03test positions in the test block.Note! Before using YJ2T test plug, please confirm you can understand warnings andintroductions in this section.Note! The continuity of YJ2T test plug leads and the state of their insulation should be checked before insertion into the MD1701-01/MD1701-02 test block.Figure 3.2-2 Application of YJ2T single-finger test plugSimilar to CJ28T, the YJ2T single-finger test plug can be inserted into individual test position in the test block as shown in the above figure.YJ2T test plug consists of two contact strips which are insulated from each other, and each of which is connected to a lead, as shown in the following figure.MD1701 Series Test Blocks Instruction Manual15 Date: 2013-07-03Figure 3.2-3 Single-finger test plugNote! An ammeter on the correct range should be connected to the two leads before YJ2Tis inserted, especially if a CT secondary circuit is being monitored.Current measurements function and voltage measurements function are provided by YJ2T single-finger test plug as introduced in the following sections.3.2.3.1 Current MeasurementsYJ2T single-finger test plug allows the current in any of the circuits routed through the test block to be monitored. When using YJ2T to monitor secondary CT current, the leads from this must never be open circuited, otherwise lethal voltages may be generated. Before YJ2T is inserted into the test plug, the connected ammeter must be on the correct range. With this plug in the test block, the ammeter range must not be changed. Therefore, potentially lethal voltages can be avoided.3.2.3.2 Voltage MeasurementsHazardous live voltages will be accessible via the YJ2T single-finger test plug leads when using YJ2T for voltage measurements.Connections to other equipment (e.g.: CTs, DC power supplies), should be made to odd numbered terminals on the test block. This ensures that when the test plug CJ28T is used, the sockets in the white half of the plug are the isolated relay circuits, and the sockets in the blue half are connected to the potentially live power supplies as shown in Figure 3.2-1.Note! It is essential that the sockets in the CJ28T test plug which correspond to currenttransformer secondary windings are by shorted using external links before the test plug is inserted into the MD1701-01/MD1701-02 test block. It ensures that current transformer secondary windings are short-circuited before they are disconnected from the protection. Please refer to Figure 3.1-5.MD1701 Series Test Blocks Instruction Manual 16 Date: 2013-07-03 Terminal 13 and terminal 14 of MD1701-01 can be used to connect the main DC auxiliary supply to the protection scheme or relay through this circuit. If it is necessary to use the DC auxiliary power supply during testing, then it can be linked across using the sockets in the CJ28T test plug. Test equipment can be connected to the relay or scheme by using the sockets in the white area of CJ28T.If more than one MD1701-01 test block is used in the connections to a relay, it is recommended to route the DC power supply through each of them, so as to avoid maloperation.4 Installation4.1 Mechanical InstallationDimension sizes and panel mounting details are listed in the following figure.Each terminal of MD1701-01/MD1701-02 has a screw outlet for pre-insulated crimp terminations.Protective earth terminal on the rear of the MD1701-01/MD1701-02 should be connected to earth by using 2.5mm2 (approximate) cable.Figure 4.1-1 Dimensions of MD1701-01 (unit: mm)MD1701 Series Test Blocks Instruction Manual 17Date: 2013-07-03MD1701 Series Test Blocks Instruction Manual 18Date: 2013-07-03Note! Dimensions of MD1701-02 are the same as MD1701-01.4.2 Multi-finger Test Plug (CJ28T)CJ28T multi-finger test plug can be plugged into MD1701-01/MD1701-02 test block. CJ28T test plug carries twenty-eight 4mm sockets. Each socket is identified by a number which corresponds to the numbered case terminal to which the socket is connected when the plug is inserted. Accessories provided with each CJ28T test plug:● Four short plug-links, each link comprising two 4mm insulated elastic plugs joined by 50mm ofinterconnecting cable.● Four long plug-links, each link comprising two 4mm insulated elastic plugs joined by 150mmof interconnecting cable.● Six spare 4mm insulated elastic plugs that readily accept up to 2.5mm 2 flexible insulatedcable for test-lead purposes.4.3 Single-finger Test Plug (YJ2T)Each YJ2T single-finger test plug is supplied pre-wired with a suitable length of 1.0mm 2 twin flexible insulated cable. The 2 cores of the cable have different colors so as to ensure polarity identification.5 Manual Version HistoryIn the current version of the instruction manual, several descriptions on existing features have been modified.Manual version and modification history recordsMD1701 Series Test Blocks Instruction Manual 19Date: 2013-07-03。
