Line differential protection RED670 1MRK505228-BEN E-Control

　　Synchrocheck, energizing check, and synchronizing SESRSYN

　　The Synchronizing function allows closing of asynchronous networks at the correct moment including the breaker closing time, which improves the network stability.

　　Synchrocheck, energizing check, and synchronizing (SESRSYN) function checks that the voltages on both sides of the circuit breaker are in synchronism, or with at least one side dead to ensure that closing can be done safely.

　　SESRSYN function includes a built-in voltage selection scheme for double bus and 1½ breaker or ring busbar arrangements.

　　Manual closing as well as automatic reclosing can be checked by the function and can have different settings.

　　For systems which are running asynchronous a synchronizing function is provided. The main purpose of the synchronizing function is to provide controlled closing of circuit breakers when two asynchronous systems are going to be connected. It is used for slip frequencies that are larger than those for synchrocheck and lower than a set maximum level for the synchronizing function.

　　Autorecloser SMBRREC

　　The autorecloser SMBRREC function provides high-speed and/or delayed auto-reclosing for single or multi-breaker applications.

　　Up to five three-phase reclosing attempts can be included by parameter setting. The first attempt can be single-, two and/ or three phase for single phase or multi-phase faults respectively.

　　Multiple autoreclosing functions are provided for multi-breaker arrangements. A priority circuit allows one circuit breaker to close first and the second will only close if the fault proved to be transient.

　　Each autoreclosing function is configured to co-operate with the synchrocheck function.

　　Apparatus control APC

　　The apparatus control functions are used for control and supervision of circuit breakers, disconnectors and earthing switches within a bay. Permission to operate is given after evaluation of conditions from other functions such as interlocking, synchrocheck, operator place selection and external or internal blockings.

　　Apparatus control features:

　　• Select-Execute principle to give high reliability

　　• Selection function to prevent simultaneous operation

　　• Selection and supervision of operator place

　　• Command supervision

　　• Block/deblock of operation

　　• Block/deblock of updating of position indications

　　• Substitution of position indications

　　• Overriding of interlocking functions

　　• Overriding of synchrocheck

　　• Operation counter

　　• Suppression of Mid position

　　Two types of command models can be used:

　　• Direct with normal security

　　• SBO (Select-Before-Operate) with enhanced security

　　In normal security, the command is processed and the resulting position is not supervised. However with enhanced security, the command is processed and the resulting position is supervised.

　　Normal security means that only the command is evaluated and the resulting position is not supervised. Enhanced security means that the command is evaluated with an additional supervision of the status value of the control object. The command security with enhanced security is always terminated by a CommandTermination service primitive.

　　Control operation can be performed from the local HMI under authority control if so defined.

　　Interlocking

　　The interlocking function blocks the possibility to operate primary switching devices, for instance when a disconnector is under load, in order to prevent material damage and/or accidental human injury.

　　Each apparatus control function has interlocking modules included for different switchyard arrangements, where each function handles interlocking of one bay. The interlocking function is distributed to each IED and is not dependent on any central function. For the station-wide interlocking, the IEDs communicate via the system-wide interbay bus (IEC 61850-8-1) or by using hard wired binary inputs/outputs. The interlocking conditions depend on the circuit configuration and apparatus position status at any given time.

　　For easy and safe implementation of the interlocking function, the IED is delivered with standardized and tested software interlocking modules containing logic for the interlocking conditions. The interlocking conditions can be altered, to meet the customer’s specific requirements, by adding configurable logic by means of the graphical configuration tool.

　　Logic rotating switch for function selection and LHMI presentation SLGGIO

　　The logic rotating switch for function selection and LHMI presentation (SLGGIO) (or the selector switch function block) is used to get a selector switch functionality similar to the one provided by a hardware selector switch. Hardware selector switches are used extensively by utilities, in order to have different functions operating on pre-set values. Hardware switches are however sources for maintenance issues, lower system reliability and an extended purchase portfolio. The logic selector switches eliminate all these problems.

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