Siemens 242 - Manuals

7SR242 Duobias Description Of Operation Section 1: Introduction This manual is applicable to the following relays: x 7SR242 Multi-Function 2-Winding Transformer Protection Relay The 7SR242 relay integrates the protection and control elements required to provide a complete transformer protection. The...

7SR242 Duobias Description Of Operation 2.4 Power Supply Unit (PSU) The relay PSU can be directly connected to any substation dc system rated from 30V dc to 220V dc. In the event of the station battery voltage level falling below the relay minimum operate level the PSU will automatically switch itse...

7SR242 Duobias Description Of Operation Liquid Crystal Display (LCD) A 4 line by 20-character liquid crystal display indicates settings, instrumentation, fault data and control commands. To conserve power the display backlighting is extinguished when no buttons are pressed for a user defined period....

7SR242 Duobias Description Of Operation initiates operation. The LED illumination colour is assigned in the OUTPUT CONFIG>LED CONFIG menu for both Pickup and Operate initiation. Functions are assigned to the LEDs in the OUTPUT CONFIG>OUTPUT MATRIX menu. Each LED can be labelled by withdrawing ...

7SR242 Duobias Description Of Operation 2.8 Binary inputs The binary inputs are opto-couplers operated from a suitably rated dc supply. Relays are fitted with 9 or 19 binary inputs (BI). The user can assign any binary input to any of the available functions (INPUT CONFIG > INPUT MATRIX). The Powe...

7SR242 Duobias Description Of Operation 2.9 Binary outputs (Output Relays) Relays are fitted with 6 or 14 binary outputs. All outputs are fully user configurable and can be programmed to operate from any or all of the available functions. The Power Supply module includes the relay basic I/O. The mod...

7SR242 Duobias Description Of Operation Event Output 1 Min Operate Time Hand Reset BO 1 hand reset S R Q OUTPUT CONFIG> OUTPUT MATRIX (Or gates) Logic signals, e.g. '51-1' Reset LEDs & Outputs (TEST/RESET key, Binary Input, Data Comms) & & & 1 1 Event Output n BO n hand reset S R ...

7SR242 Duobias Description Of Operation Section 3: Protection Functions 3.1 Current Protection: Differential Protection Comprises both biased differential and high-set differential elements. The fundamental frequency current is measured with the line CT inputs. These line currents are both multiplie...

7SR242 Duobias Description Of Operation ©2010 Siemens Protection Devices Limited Chapter 1 Page 21 of 52 3.1.2 Overall Biased Differential (87BD) 87BD Initial Setting 1 st Bias Slope Limit Bias (Restraint) Current 2 I I W2 W1 87B D 1 st Bias Slop e 2nd Bias Slope Type W2 W1 I I I W1 I W2 Figure 3-1 ...

7SR242 Duobias Description Of Operation 3.2.2 Time Delayed Overcurrent Protection (51) Optionally two time delayed overcurrent elements are provided, each can be selected to either winding 1 or winding 2. 51-n Setting sets the pick-up current level. A number of shaped characteristics are provided. A...

7SR242 Duobias Description Of Operation 3.5 Current Protection: High Impedance Restricted Earth Fault (64H) Two high impedance restricted earth fault elements are provided, one for each transformer winding The relay utilises fundamental current measurement values for this function. The single phase ...

7SR242 Duobias Description Of Operation 3.7 Current Protection: Negative Phase Sequence Overcurrent (46NPS) Optionally four NPS current elements are provided – 2 x 46IT and 2 x 46DT. Each element can be selected to either winding 1 or winding 2. The 46IT elements can be configured to be either defin...

7SR242 Duobias Description Of Operation 3.9 Current Protection: Thermal Overload (49) Optionally a phase segregated thermal overload element is provided, this can be selected to either winding 1 or winding 2. The thermal state is calculated using the measured True RMS current. Should the current ris...

7SR242 Duobias Description Of Operation 3.11 Voltage Protection: Under/Over Voltage (27/59) Optionally four under/over voltage elements are provided. The relay utilises fundamental voltage measurement values for this function. 27/59-n Setting sets the pick-up voltage level for the element. The sense...

7SR242 Duobias Description Of Operation Section 4: Control & Logic Functions 4.1 Quick Logic The ‘Quick Logic’ feature allows the user to input up to 16 logic equations (E1 to E16) in text format. Equations can be entered using Reydisp or at the relay fascia. Each logic equation is built up from...

7SR242 Duobias Description Of Operation Section 5: Supervision Functions 5.1 Circuit Breaker Failure (50BF) Two CB Fail elements are provided – one element per winding. Each circuit breaker fail function has two time delayed outputs that can be used for combinations of re-tripping or back-tripping. ...

7SR242 Duobias Description Of Operation 5.5 Demand Maximum, minimum and mean values of line currents and voltage (where applicable) are available as instruments which can be read in the relay INSTRUMENTS MENU or via Reydisp. The DATA STORAGE > DEMAND DATA LOG > Data Log Period setting is used ...

7SR242 Duobias Description Of Operation Section 6: Other Features 6.1 Data Communications Two communication ports, COM1 and COM2 are provided. RS485 connections are available on the terminal blocks at the rear of the relay (COM1). A USB port, COM 2, is provided at the front of the relay for local ac...

7SR242 Duobias Description Of Operation I 2 t CB2 Wear: As CB1 The status of each counter can be viewed in the INSTRUMENTS mode. Binary outputs can be mapped to each of the above counters, these outputs are energised when the user defined Alarm Limit is reached. 6.3 Data Storage 6.3.1 General The re...

7SR242 Duobias Description Of Operation Waveforms are sampled at a rate of 1600Hz. Stored waveforms can be erased using the DATA STORAGE> Clear Waveforms setting. 6.3.4 Fault Records Up to ten fault records can be stored and displayed on the Fascia LCD. Fault records provide a summary of the rela...

7SR242 Duobias Description Of Operation 6.5 Operating Mode The relay has three operating modes, Local, Remote and Out of Service. The following table identifies the functions operation in each mode. The modes can be selected by the following methods: SYSTEM CONFIG> RELAY MODE setting, a Binary In...

7SR242 Duobias Description Of Operation ©2010 Siemens Protection Devices Limited Chapter 1 Page 52 of 52 6.7.1 Time Synchronisation – Data Comms Where the data comms channel(s) is connected to a dedicated substation automation system the relay can be time synchronised using the relevant command with...

7SR242 Duobias Settings, Configuration & Instruments Guide Section 1: Introduction 1.1 Relay Menus And Display All relay fascias contain the same access keys although the fascias may differ in appearance from model to model. The basic menu structure is also the same in all products and consists ...

7SR242 Duobias Settings, Configuration & Instruments Guide 1.2 Operation Guide 1.2.1 User Interface Operation The basic menu structure flow diagram is shown in Figure 1.2-2. This diagram shows the main modes of display: Settings Mode, Instrument Mode, Fault Data Mode and Control Mode. When the r...

7SR242 Duobias Settings, Configuration & Instruments Guide 1.3 Settings Display The Settings Mode is reached by pressing the READ DOWN button from the relay identifier screen. Once the Settings Mode title screen has been located pressing the READ DOWN button takes the user into the Settings mode...

7SR242 Duobias Settings, Configuration & Instruments Guide DIFFERENTIAL METERS to view This is the sub-group that includes all the meters that are associated with Current TEST/RESET allows access to this sub-group W1 Line Ia 0.00xIn ---- o Ib 0.00xIn ---- o Ic 0.00xIn ---- o Displays Winding 1 I...

7SR242 Duobias Settings, Configuration & Instruments Guide CURRENT METERS to view This is the sub-group that includes all the meters that are associated with Current TEST/RESET allows access to this sub-group W1 Primary Ia 0.00kA Ib 0.00kA Ic 0.00kA Displays the 3 phase currents Primary RMS valu...

7SR242 Duobias Settings, Configuration & Instruments Guide MAINTENANCE METERS to view This is the sub-group that includes all the meters that are associated with Maintenance TEST/RESET allows access to this sub-group CB1 Manual Close Last Close ms CB1 Manual Open Last Open ms Displays the CB man...

7SR242 Duobias Settings, Configuration & Instruments Guide QUICK LOGIC METERS to view E 1-8 E 9-16 E1 Equation 0 EQN = 0 TMR 0-0 = 0 CNT 0-1 = 0 En Equation 1.5 Fault Data Mode The Fault Data Mode sub menu lists the time and date of the previous ten protection operations. The stored data about e...

7SR242 Duobias Settings, Configuration & Instruments Guide Section 2: Setting the Relay Using Reydisp Evolution To set the relay using the communication port the user will need the following:- PC with REYDISP Evolution Installed. (REYDISP can be downloaded from our website www.siemens.com/energy...

7SR242 Duobias Settings, Configuration & Instruments Guide 2.1.2 Rear RS485 connection Figure 2-2 RS485 connection to PC 2.1.3 Optional rear fibre optic connection Figure 2-3 Fibre Optic Connection to PC Sigma devices have a 25 pin female D connector with the following pin out. Pin Function 2 Tr...

7SR242 Duobias Settings, Configuration & Instruments Guide ©2010 Siemens Protection Devices Limited Chapter 2 Page 19 of 20 2.1.4 Configuring Relay Data Communication Using the keys on the relay fascia scroll down the settings menu’s into the ‘communications’ menu. All of the below settings may ...

7SR242 Duobias Settings, Configuration & Instruments Guide ©2010 Siemens Protection Devices Limited Chapter 2 Page 20 of 20 2.1.5 Connecting to the Relay via Reydisp When Reydisp software is running all available communication ports of the PC will automatically be detected. On the start page too...

7SR242 Duobias Performance Specification ©2010 Siemens Protection Devices Limited Chapter 3 - Page 5 of 45 Section 1: Common Functions 1.1 General 1.1.1 CE Conformity This product is CE compliant to relevant EU directives. 1.1.2 Reference This product complies with IEC 60255-3, IEC 60255-6 and IEC 6...

7SR242 Duobias Performance Specification ©2010 Siemens Protection Devices Limited Chapter 3 - Page 6 of 45 1.2 Energising Quantities 1.2.1 Auxiliary Power Supply Nominal Operating Range V AUX 30, 48, 110, 220 VDC 24 to 290 VDC 1.2.1.1 Burden Attribute Value Quiescent (typical) 6.0 W 30V DC Quiescent...

7SR242 Duobias Performance Specification ©2010 Siemens Protection Devices Limited Chapter 3 - Page 7 of 45 1.2.3 AC Voltage Nominal Operating Range Vn 40 to 160 V Up to 270 V fn 50, 60Hz 47 to 62Hz 1.2.3.1 Burden Attribute Value AC Burden 0.01 VA at 110 V 1.2.4 Binary (Digital) Outputs Contact ratin...

7SR242 Duobias Performance Specification ©2010 Siemens Protection Devices Limited Chapter 3 - Page 8 of 45 1.2.5 Binary (Digital) Inputs Nominal Operating Range 19 VDC 17 to 290 VDC V BI 88 VDC 74 to 290 VDC 1.2.5.1 Performance Attribute Value V BI = 19 V 1.5mA Maximum DC current for operation V BI ...

7SR242 Duobias Performance Specification ©2010 Siemens Protection Devices Limited Chapter 3 - Page 10 of 45 1.3 Functional Performance 1.3.1 Instrumentation Instrument Value Reference Typical accuracy I Current I t 0.1 x In r 1 % In V Voltage V t 0.8 x Vn r 1 % Vn 1.3.2 USB Data Communication Interf...

7SR242 Duobias Performance Specification ©2010 Siemens Protection Devices Limited Chapter 3 - Page 11 of 45 1.4 Environmental Performance 1.4.1 General 1.4.1.1 Temperature IEC 60068-2-1/2 Type Level Operating range -10 q C to +55 q C Storage range -25 q C to +70 q C 1.4.1.2 Humidity IEC 60068-2-3 Ty...

7SR242 Duobias Performance Specification ©2010 Siemens Protection Devices Limited Chapter 3 - Page 18 of 45 2.3 46BC Open Circuit 2.3.1 Reference Parameter Value I set NPS to PPS ratio 20,21…100% t f Delay setting 0.03,04,20.0,20.1,100,101,1000,1010…..14400 s Is 46BC-n U/I Guard Setting 0.05, 0.10…5...

7SR242 Duobias Performance Specification ©2010 Siemens Protection Devices Limited Chapter 3 - Page 19 of 45 2.4 46NPS Negative Phase Sequence Overcurrent 2.4.1 Reference (46DT) Parameter Value I s Setting 0.05, 0.06... 4.0 xIn t d Delay setting 0.00, 0.01…20.00, 20.50… 100, 101… 1000, 1010… 10000, 1...

7SR242 Duobias Performance Specification ©2010 Siemens Protection Devices Limited Chapter 3 - Page 20 of 45 2.4.6 Operate and Reset Time (46IT) Attribute Value Starter operate time ( t 2 xIs ) 35 ms, r 10ms char = IEC-NI, IEC-VI, IEC-EI, IEC-LTI > @ Tm K t Is I op u 1 D , r 5 % absolute or r 50 m...

7SR242 Duobias Performance Specification ©2010 Siemens Protection Devices Limited Chapter 3 - Page 21 of 45 2.5 49 Thermal Overload 2.5.1 Reference Parameter Value Is Overload setting 0.10, 0.11… 3 xIn W Time constant setting 1, 1.5… 1000 min 2.5.2 Operate and Reset Level Attribute Value I ol Overlo...

7SR242 Duobias Performance Specification ©2010 Siemens Protection Devices Limited Chapter 3 - Page 22 of 45 0.1 1 10 100 1000 10000 100000 0 1 2 3 4 5 6 7 8 9 10 Curre nt (m ultiple of se tting) Tim e (se c) W = 1000 mins W = 100 mins W = 10 mins W = 1 min Figure 2-1 Thermal Overload Protection Curv...

7SR242 Duobias Performance Specification ©2010 Siemens Protection Devices Limited Chapter 3 - Page 23 of 45 2.6 50 instantaneous overcurrent 2.6.1 Reference Parameter Value Is Setting 0.05, 0.10… 25, 25.5… 50 x In t d Delay setting 0.00, 0.01…20.00, 20.50… 100, 101… 1000, 1010… 10000, 10100… 14400 s...

7SR242 Duobias Performance Specification ©2010 Siemens Protection Devices Limited Chapter 3 - Page 24 of 45 2.7 50N instantaneous Derived Earth Fault 2.7.1 Reference Parameter Value Is Setting 0.05, 0.10… 25, 25.5… 50 x In t d Delay setting 0.00, 0.01…20.00, 20.50… 100, 101… 1000, 1010… 10000, 10100...

7SR242 Duobias Performance Specification ©2010 Siemens Protection Devices Limited Chapter 3 - Page 25 of 45 2.8 50G Instantaneous Measured Earth Fault 2.8.1 Reference Parameter Value Is Setting 0.005…25.0 x In t d Delay setting 0.00, 0.01…20.00, 20.50… 100, 101… 1000, 1010… 10000, 10100… 14400 s 2.8...

7SR242 Duobias Performance Specification ©2010 Siemens Protection Devices Limited Chapter 3 - Page 26 of 45 2.9 51 Time Delayed Overcurrent 2.9.1 Reference Parameter Value Is Setting 0.05, 0.1… 2.5 xIn char Characteristic setting IEC-NI, -VI, -EI, -LTI; ANSI-MI, -VI, -EI; DTL Tm Time Multiplier sett...

7SR242 Duobias Performance Specification ©2010 Siemens Protection Devices Limited Chapter 3 - Page 28 of 45 2.10 51N Time Delayed Derived Earth Fault 2.10.1 Reference Parameter Value Is Setting 0.05, 0.1… 2.5 xIn char Characteristic setting IEC-NI, -VI, -EI, -LTI; ANSI-MI, -VI, -EI; DTL Tm Time Mult...

7SR242 Duobias Performance Specification ©2010 Siemens Protection Devices Limited Chapter 3 - Page 30 of 45 2.11 51G Time Delayed Measured Earth Fault 2.11.1 Reference Parameter Value Is Setting 0.005, 0.10… 1.0 xIn Char Characteristic setting IEC-NI, -VI, -EI, -LTI; ANSI-MI, -VI, -EI; DTL Tm Time M...

7SR242 Duobias Performance Specification ©2010 Siemens Protection Devices Limited Chapter 3 - Page 32 of 45 0.1 1 10 100 1000 1 10 100 Current (multiples of setting) T ime (sec) 2 3 4 5 6 8 20 30 40 50 60 80 Long Time Inverse Normal Inverse Very Inverse Extremely Inverse Figure 2-2 IEC IDMTL Curves ...

7SR242 Duobias Performance Specification ©2010 Siemens Protection Devices Limited Chapter 3 - Page 33 of 45 0.1 1 10 100 1000 1 10 100 Current (multiples of setting) T ime (sec) 2 3 4 5 6 8 20 30 40 50 60 80 Moderately Inverse Extremely Inverse Very Inverse Figure 2-3 ANSI IDMTL Operate Curves (Time...

7SR242 Duobias Performance Specification ©2010 Siemens Protection Devices Limited Chapter 3 - Page 35 of 45 2.12 59N Neutral Voltage Displacement 2.12.1 Reference (59NDT) Parameter Value V s Setting 1, 1.5… 100V t d Delay setting 0.00, 0.01…20.00, 20.50… 100, 101… 1000, 1010… 10000, 10100… 14400 s 2...

7SR242 Duobias Performance Specification ©2010 Siemens Protection Devices Limited Chapter 3 - Page 37 of 45 2.13 64H Restricted Earth Fault Protection 2.13.1 Reference Parameter Value I s Setting 0.005, 0.010… 0.95 x In t d Delay setting 0.00, 0.01… 20.0, 20.1… 100.0, 101.…1000, 1010 … 10000 , 10100...

7SR242 Duobias Performance Specification ©2010 Siemens Protection Devices Limited Chapter 3 - Page 40 of 45 Operate and Reset Level Attribute Value Operate level 2 nd Bias Slope Type = Line B) I (for I M I and I M I and I I RESTRAIN RESTRAIN 2 OPERATE RESTRAIN 1 OPERATE SETTING INITIAL 87 OPERATE ! ...

7SR242 Duobias Performance Specification ©2010 Siemens Protection Devices Limited Chapter 3 - Page 43 of 45 3.2 74TCS/CCS Trip/Close Circuit Supervision 3.2.1 Reference Parameter Value t d Delay setting 0, 0.02…60 s 3.2.2 Operate and Reset Time Attribute Value t basic Element basic operate time 30ms...

7SR242 Duobias Performance Specification ©2010 Siemens Protection Devices Limited Chapter 3 - Page 44 of 45 3.3 81HBL2 Inrush Detector 3.3.1 Reference Parameter Value I Setting (Ratio of 2nd Harmonic current to Fundamental component current) 0.10, 0.11... 0.5 3.3.2 Operate and Reset Level Attribute ...

7SR242 Duobias Performance Specification ©2010 Siemens Protection Devices Limited Chapter 3 - Page 45 of 45 3.4 81HBL5 Overfluxing Detector 3.4.1 Reference Parameter Value I Setting (Ratio of 5th Harmonic current to Fundamental component current) 0.10, 0.11... 0.5 3.4.2 Operate and Reset Level Attri...

7SR242 Duobias Data Communications ©2010 Siemens Protection Devices Limited Chapter 4 Page 4 of 43 Section 2: Physical Connection The relay provides one ‘Front’ USB communication interface (Com2) located on the fascia and one RS485 (Com1) located on the ‘Rear’. Optional Fibre optic ports can also be...

7SR242 Duobias Data Communications ©2010 Siemens Protection Devices Limited Chapter 4 Page 5 of 43 2.1 Communication ports 2.1.1 USB Interface The USB communication port is connected using a standard USB cable with a type B connection to the relay and type A to the PC. The PC will require a suitable...

7SR242 Duobias Data Communications ©2010 Siemens Protection Devices Limited Chapter 4 Page 7 of 43 2.1.3 Fibre Optic Interface When connecting via the optional fibre optic interface the selection of fibre-optic cable is important. Fibres must be terminated with STTM (BFOC/2.5) connectors. The recomm...

7SR242 Duobias Data Communications ©2010 Siemens Protection Devices Limited Chapter 4 Page 11 of 43 Section 3: IEC 60870-5-103 Definitions 3.1 Introduction This section describes the IEC 60870-5-103 protocol implementation in the relays. This protocol is used for the communication with REYDISP softw...

7SR242 Duobias Data Communications ©2010 Siemens Protection Devices Limited Chapter 4 Page 18 of 43 Section 4: Modbus Definitions 4.1 Introduction This section describes the MODBUS-RTU protocol implementation in the relays. This protocol is used for communication with a suitable control system. This...

7SR242 Duobias Data Communications ©2010 Siemens Protection Devices Limited Chapter 4 Page 25 of 43 Section 5: DNP3.0 Definitions 5.1 Device Profile The following table provides a “Device Profile Document” in the standard format defined in the DNP 3.0 Subset Definitions Document. While it is referre...

7SR242 Duobias Data Communications ©2010 Siemens Protection Devices Limited Chapter 4 Page 27 of 43 DNP V3.0DEVICE PROFILE DOCUMENT (Also see the DNP 3.0 Implementation Table in Section 5.2, beginning on page 28.)Sends Multi-Fragment Responses: 7 Yes No Configurable Sequential File Transfer Support:...

7SR242 Duobias Data Communications ©2010 Siemens Protection Devices Limited Chapter 4 Page 28 of 43 5.2 Implementation Table The following table identifies which object variations, function codes, and qualifiers the Triangle MicroWorks, Inc. DNP 3.0 Slave Source Code Library supports in both request...

7SR242 Duobias Data Communications ©2010 Siemens Protection Devices Limited Chapter 4 Page 33 of 43 5.3 Point List The tables below identify all the default data points provided by the implementation of the Triangle MicroWorks, Inc. DNP 3.0 Slave Source Code Library. Binary Input Points The default ...

7SR242 Duobias Data Communications ©2010 Siemens Protection Devices Limited Chapter 4 Page 41 of 43 Section 6: Modems The communications interface has been designed to allow data transfer via modems. However, IEC 60870-5-103 defines the data transfer protocol as an 11 bit format of 1 start, 1 stop, ...

7SR242 Duobias Data Communications ©2010 Siemens Protection Devices Limited Chapter 4 Page 42 of 43 6.1.3 Connecting to the Remote Modem Once the remote modem has been configured correctly, it should be possible to dial up the modem and make connection to the relay. As the settings on the remote mod...

7SR242 Duobias Installation Guide Section 2: Equipment Operating Conditions 2.1 Current Transformer Circuits The secondary circuit of a live CT must not be open circuited. Non-observance of this precaution can result in injury to personnel and/or damage to equipment. ! 2.2 External Resistors Where e...

7SR242 Duobias Installation Guide ©2010 Siemens Protection Devices Limited Chapter 5 Page 6 of 13 Section 3: Dimensions and Panel Fixings 3.1 Relay Dimensions and Weight Relays are supplied in size E8 and E10 cases. The drawing below provide panel cut-out and mounting details. Overall Dimensions and...

7SR242 Duobias Installation Guide 3.2 Fixings 3.2.1 Crimps Ring tongued crimps with 90˚ bend are recommended. 3.2.2 Panel Fixings Typical mounting screw kit per Relay) Consists of 4 off M4x10mm Screws 4 off M4 Nuts 4 off M4 Lock Washer Typical rear terminal block fixing kit (1kit per terminal block ...

7SR242 Duobias Installation Guide ©2010 Siemens Protection Devices Limited Chapter 5 Page 8 of 13 Section 4: Rear Terminal Drawings 4.1 E8 CASE E8 STANDARD COMMS + ADDITIONAL PORTS i.e.:- USB FRONT PORT, RS485 (SEE NOTE 2) IRIG B, 2 X F.O. (S.T. CONNECTORS) Notes 1) RECOMMENDED TERMINATIONS ARE PRE-...

7SR242 Duobias Installation Guide ©2010 Siemens Protection Devices Limited Chapter 5 Page 9 of 13 4.2 E10 CASE Notes 1) RECOMMENDED TERMINATIONS ARE PRE-INSULATED & MUST BE CRIMPED USING APPROVED TOOLING. 2) RS485 (BLOCK”B”TERMS 14, 16, 18, 20) CONNECTION TO THIS COMMUNICATION FACILITY IS BY SCR...

7SR242 Duobias Installation Guide Section 5: Connection/Wiring/Diagrams 5.1 Wiring Diagram: 7SR242 Relay Figure 5.1-1 7SR242 Wiring Diagram ©2010 Siemens Protection Devices Limited Chapter 5 Page 10 of 13

7SR242 Duobias Installation Guide ©2010 Siemens Protection Devices Limited Chapter 5 Page 11 of 13 Section 6: Data Comms Connections 6.1 RS485 Connection The RS485 communication port terminals are located on the rear of the relay and can be connected using a suitable RS485 120 screened twisted pair ...

7SR242 Duobias Installation Guide 6.3 Fibre Optic Connections Where fitted rear Data Comms ports 3 and 4 comprise Fibre–Optic ST™ (BFOC/2.5) bayonet connectors-4 per product. 62.5 / 125m glass fibre is recommended for all lead lengths. When installing fibre, ensure that the fibres’ bend radii comply...

7SR242 Duobias Installation Guide Section 7: Connection Diagrams 7.1 Typical Connection: 7SR242 Figure 7.1-1 7SR24 Typical Connections ©2010 Siemens Protection Devices Limited Chapter 5 Page 13 of 13

7SR242 Duobias Commissioning & Maintenance Guide ©2010 Siemens Protection Devices Limited Chapter 6 Page 5 of 56 Section 1: Common Functions 1.1 Overview Commissioning tests are carried out to prove: a) Equipment has not been damaged in transit. b) Equipment has been correctly connected and inst...

7SR242 Duobias Commissioning & Maintenance Guide ©2010 Siemens Protection Devices Limited Chapter 6 Page 6 of 56 1.2.3 Test Equipment Required test equipment is: Secondary injection equipment with integral time interval meter Primary injection equipment A d.c. supply with nominal voltage within ...

7SR242 Duobias Commissioning & Maintenance Guide ©2010 Siemens Protection Devices Limited Chapter 6 Page 7 of 56 1.2.5 Applying Settings The relay settings for the particular application should be applied before any secondary testing occurs. If they are not available then the relay has default s...

7SR242 Duobias Commissioning & Maintenance Guide ©2010 Siemens Protection Devices Limited Chapter 6 Page 8 of 56 1.3 Tests 1.3.1 Inspection Ensure that all connections are tight and correct to the relay wiring diagram and the scheme diagram. Record any deviations. Check that the relay is correct...

7SR242 Duobias Commissioning & Maintenance Guide ©2010 Siemens Protection Devices Limited Chapter 6 Page 9 of 56 1.4 AC Energising Quantities Voltage and current measurement for each input channel is displayed in the Instrumentation Mode sub-menus, each input should be checked for correct connec...

7SR242 Duobias Commissioning & Maintenance Guide ©2010 Siemens Protection Devices Limited Chapter 6 Page 10 of 56 1.5 Binary Inputs The operation of the binary input(s) can be monitored on the ‘Binary Input Meters’ display shown in ‘Instruments Mode’. Apply the required supply voltage onto each ...

7SR242 Duobias Commissioning & Maintenance Guide ©2010 Siemens Protection Devices Limited Chapter 6 Page 12 of 56 Section 2: Protection Functions This section details the procedures for testing each protection function of the 7SR24 relay. These tests are carried out to verify the accuracy of the...

7SR242 Duobias Commissioning & Maintenance Guide ©2010 Siemens Protection Devices Limited Chapter 6 Page 14 of 56 2.1 Biased Differential (87BD, 87HS) Figure 2-1 Biased Differential Voltage Inputs: None Current Inputs: W1-I L1 (I A ),W1-I L2 (I B ),W1-I L3 (I C ), and W2-I L1 (I A ),W2-I L2 (I B...

7SR242 Duobias Commissioning & Maintenance Guide ©2010 Siemens Protection Devices Limited Chapter 6 Page 17 of 56 2.1.2 Primary Injection Testing Primary injection is recommended to prove the relay connections, CT polarity and settings before putting the protection scheme into service. Primary i...

7SR242 Duobias Commissioning & Maintenance Guide ©2010 Siemens Protection Devices Limited Chapter 6 Page 23 of 56 2.2.2.1 Element Blocking The Measured Earth Fault elements can be blocked by Binary Input Inhibit, VT Supervision and Inrush Detector operation. The Characteristic can be made non-di...

7SR242 Duobias Commissioning & Maintenance Guide ©2010 Siemens Protection Devices Limited Chapter 6 Page 27 of 56 2.4 Restricted Earth fault (64H) Figure 2-6 Restricted Earth Fault Voltage Inputs: n/a Current Inputs: I G1 , I G2 Disable: 50G, 51G, 50BF Map Pickup LED: 64H-n - Self Reset The exte...

7SR242 Duobias Commissioning & Maintenance Guide ©2010 Siemens Protection Devices Limited Chapter 6 Page 31 of 56 2.6 Negative Phase Sequence Overcurrent (46NPS) Figure 2-8 Negative Phase Sequence Overcurrent Voltage Inputs: n/a Current Inputs: W1-I L1 (I A ), W1-I L2 (I B ), W1-I L3 (I C ), or ...

7SR242 Duobias Commissioning & Maintenance Guide ©2010 Siemens Protection Devices Limited Chapter 6 Page 42 of 56 2.10.1 Definite Time (59NDT) If DTL setting is small, gradually increase single phase voltage until element operates. If DTL is large apply 0.9x setting, check for no operation, appl...

7SR242 Duobias Commissioning & Maintenance Guide ©2010 Siemens Protection Devices Limited Chapter 6 Page 47 of 56 Section 3: Supervision Functions 3.1 CB Fail (50BF) Figure 3-1 CB Fail Voltage Inputs: n/a Current Inputs: W1-I L1 (I A ), W1-I L2 (I B ), W1-I L3 (I C ), I G1 or W2-I L1 (I A ), W2-...

7SR242 Duobias Commissioning & Maintenance Guide ©2010 Siemens Protection Devices Limited Chapter 6 Page 54 of 56 Section 5: Testing and Maintenance 7SR24 relays are maintenance free, with no user serviceable parts. 5.1 Periodic Tests During the life of the relay, it should be checked for operat...

7SR242 Duobias Commissioning & Maintenance Guide ©2010 Siemens Protection Devices Limited Chapter 6 Page 55 of 56 Observation Action Cannot communicate with the relay. Check that all of the communications settings match those used by ReyDisp Evolution. Check that the Tx and Rx fibre-optic cables...

7SR242 Duobias Commissioning & Maintenance Guide ©2010 Siemens Protection Devices Limited Chapter 6 Page 56 of 56 5.4 Defect Report Please copy this sheet and use it to report any defect that may occur. Contact Name: Telephone No: Customers Name & Address: Fax No: Supplied by: Date when inst...

7SR242 Duobias Applications Guide ©2010 Siemens Protection Devices Limited Chapter 7 Page 4 of 56 List of Figures Figure 1-1 Example Use of Alternative Settings Groups ......................................................................5 Figure 1-2 Example of Transformer Alarm and Trip Wiring .......

7SR242 Duobias Applications Guide Section 1: Common Functions 1.1 Multiple Settings Groups Alternate settings groups can be used to reconfigure the relay during significant changes to system conditions e.g. Primary plant switching in/out. Summer/winter or day/night settings. switchable earthing conn...

7SR242 Duobias Applications Guide 1.2 Binary Inputs Each Binary Input (BI) can be programmed to operate one or more of the relay functions, LEDs or output relays. These could be used to bring such digital signals as Inhibits for protection elements, the trip circuit supervision status, autoreclose c...

7SR242 Duobias Applications Guide The Effects of Capacitance Current The binary inputs have a low minimum operate current and may be set for instantaneous operation. Consideration should be given to the likelihood of mal-operation due to capacitance current. Capacitance current can flow through the ...

7SR242 Duobias Applications Guide 1.3 Binary Outputs Binary Outputs are mapped to output functions by means of settings. These could be used to bring out such digital signals as trips, a general pick-up, plant control signals etc. All Binary Outputs are trip rated Each can be defined as Self or Hand...

7SR242 Duobias Applications Guide Interposing CT Selection Guide Power Transformer Vector Group HV Interposing CT Selection LV Interposing CT Selection Yy0, YNy0, Yyn0, YNyn0, Ydy0, Yndy0, Ydyn0, Yndyn0, Dz0 Ydy0,0 q Ydy0,0 q Yd1, YNd1 Yd1,-30 q Yy0,0 q Yd1, YNd1 + Earthing Transformer Yd1,-30 q Ydy...

7SR242 Duobias Applications Guide ©2010 Siemens Protection Devices Limited Chapter 7 Page 13 of 56 2.1.3 Biased Differential (87BD) Settings The 87BD elements provide differential protection for phase and earth faults. The limiting factors for protection sensitivity are dictated by the need to ensur...

7SR242 Duobias Applications Guide When a through fault occurs, saturation of one or more CTs may cause a transient differential current to be detected by the relay. The bias slope limit is chosen to ensure the biased differential function is stable for high through fault currents coincident with CT ...

7SR242 Duobias Applications Guide 2.1.4 Differential Highset (87HS) Settings The element operates on the differential current measured by the relay. The 87HS element is generally applied as an unrestrained differential element to provide fast tripping for heavy internal faults. 87HS Delay 87HS I W1 ...

7SR242 Duobias Applications Guide 2.1.5.1 Example 1 – Further Analysis Having established settings to ensure stability under load, transient and external fault conditions the following considers the operating levels for internal faults. The ‘fault setting’ for internal fault conditions is affected b...

7SR242 Duobias Applications Guide W1 Internal Phase-Phase Fault Figure 2-8: Relay Currents - Star Winding Internal Phase Fault Notes B - C fault causes current to flow in the A, B and C elements The Yd ICT connection causes a 1:2:1 current distribution and introduces a 1/3 multiplying factor. Relay ...

7SR242 Duobias Applications Guide W2 Internal Earth Fault Figure 2-9: Relay Currents - Delta Winding Internal Earth Fault W2 Internal Phase-Phase Fault Figure 2-10: Relay Currents - Delta Winding Internal Phase Fault ©2010 Siemens Protection Devices Limited Chapter 7 Page 21 of 56

7SR242 Duobias Applications Guide 2.1.6 Example 2 – Relay Replacement Using Existing CTs Figure 2-11 Relay Replacement It is recommended to wire all line CTs in star when connecting to the 7SR24 relay. Where the 7SR24 is used to replace an older biased differential relay the existing CTs will often ...

7SR242 Duobias Applications Guide Step 1 – Connection of CTs Remove all interposing CTs from the secondary circuit. Connect all line CT secondary wiring in star. HV load current = A 132,000 3 10 45 6 8 . 196 u u Re-use 300/1A CTs. LV load current = A 33,000 3 10 45 6 9 . 747 95 . 0 u u u Re-use 560/...

7SR242 Duobias Applications Guide 2.4 High Impedance Restricted Earth Fault (64H) Restricted earth fault (REF) protection can be applied to either or both windings of the transformer. The 7SR24 provides a high impedance REF (64H) element for each transformer winding. Low leakage reactance CTs (Class...

7SR242 Duobias Applications Guide The relay current setting is calculated taking into account: the required operate level for in-zone earth faults (fault setting). Determination of Stability The stability of the high impedance REF scheme depends upon the operate voltage setting being greater than th...

7SR242 Duobias Applications Guide 2.8 Thermal Overload (49) Thermal protection is provided to supplement the Winding Temperature device. This function provides a general overload thermal protection i.e. not a winding hot spot protection. Outputs can be assigned to both alarm and trip levels. The def...

7SR242 Duobias Applications Guide 2.10 Neutral Overvoltage (59N) Neutral Overvoltage Displacement (Residual Overvoltage) protection is used to detect an earth fault where little or no earth current flows. This can occur where a transformer feeder has been tripped at its HV side for an earth fault, b...

7SR242 Duobias Applications Guide 2.10.1 Application with Capacitor Cone Units Capacitor cones provide a cost effective method of deriving residual voltage. The wide range of capacitor cone component values used by different manufacturers means that the relay cannot be connected directly to the cone...

7SR242 Duobias Applications Guide Section 3: CT Requirements The specification of CTs must meet the requirements of all protection functions utilised e.g. overall differential, REF and backup over current protections. The relay has 1A and 5A rated terminals for each CT input and any combination of t...

7SR242 Duobias Applications Guide Worked Example Figure 3-1 CT Requirements Suitability of HV Current Transformers: 126.5V 1 3.5 0.14 400 10 132 3 10 90 4 V 3 6 K u u u u u u u t i.e. less than 250V Suitability of LV Current Transformers: V 12 0.14 00 10 33 3 10 90 4 V 3 6 K 9 . 449 4 16 u u u u u u...

7SR242 Duobias Applications Guide Section 5: Supervision Functions 5.1 Inrush Detector (81HBL2) 87 Inrush Element (Enable, Disable) When a transformer is energized transient magnetizing inrush currents flow in each phase of the energised winding. Inrush currents only flow into one transformer windin...

7SR242 Duobias Applications Guide 5.3 Circuit Breaker Fail (50BF) Where a circuit breaker fails to operate to clear fault current the power system will remain in a hazardous state until the fault is cleared by remote or back-up protections. To minimise any delay, CB Failure protection provides a sig...

7SR242 Duobias Applications Guide 5.4 Trip Circuit Supervision (74TCS) Binary Inputs may be used to monitor the integrity of the CB trip circuit wiring. Current flows through the B.I. confirming the integrity of the auxiliary supply, CB trip coil, auxiliary switch, C.B. secondary isolating contacts ...

7SR242 Duobias Applications Guide ©2010 Siemens Protection Devices Limited Chapter 7 Page 48 of 56 5.4.2 Close Circuit Supervision Connections R BI +ve -ve + BO 1 BO n Remote Alarm BO R CLOSE COIL 52a 52b - Circuit Breaker Resistor:30V dc Nominal: R = 3K9 48V dc Nominal: R = 5K6 110V dc Nominal: R =...

7SR242 Duobias Applications Guide Section 6: Application Considerations and Examples 6.1 The Effects of An In Zone Earthing Transformer The in zone earthing transformer is a source of zero-sequence fault current. An earth fault on the delta side of the transformer external to the differential protec...

7SR242 Duobias Applications Guide 6.2 Protection of Star/Star Transformer With Tertiary Winding Figure 6-4: The provision of the tertiary winding in star/star transformers both stabilises the neutral potential and can allow earth fault current to flow in the secondary connections i.e. reduces the ze...

7SR242 Duobias Applications Guide 6.3 Transformer with Primary Connections Crossed on Both Windings Yd11 Transformer Connected as Yd9 (90 0 ) The phase-shift between the W1 and W2 primary systems may necessitate that primary connections to each winding of the transformer have to be crossed. Fig. 6.4...

7SR242 Duobias Applications Guide Solution 2 Figure 6.4-2 shows use of the ICT Connection settings to correct for the phase shift introduced by the transformer connection i.e. ICT1 Connection is set to to Yd9, -90° and ICT2 Connection is set to Ydy0, 0°. ICT1 = Yd9 W1/W2 Yd11 (30 o ) 17 18 1 2 5 6 9...

7SR242 Duobias Applications Guide 6.4 Transformer with Primary Connections Crossed on One Winding Reversing the connections on only one side of the transformer will reverse the phase sequence of the system. For this arrangement W1 and W2 CT secondary wiring must be crossed over to replicate the cros...

7SR242 Duobias Applications Guide 6.5 Protection of Auto Transformers The transformer has a phase shift of zero. To prevent undesired tripping of the overall differential protection for external faults a zero sequence shunt is required, this is implemented by selecting star/delta ICT Connection sett...

7SR242 Duobias Applications Guide 6.6 Reactor and Connections Protection 17 18 1 2 5 6 9 10 14 13 I G1 2 1 6 5 10 9 W1 I L1 W1 I L2 W1 I L3 ICT1 = Yy0 ICT2 = Yy0 A 17 18 I G2 1 2 5 6 9 10 W2 I L1 W2 I L2 W2 I L3 A B Figure 6-10 AC Connections for Reactor and Connections Protection Settings must take...

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