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      CIRCUIT BREAKER FAILURE PROTECTION PANEL

      Product Overview

      Breaker operation failure can be caused by problems with the breaker equipment or cables that transmit from the transmission line protection panel, transformer protection panel, etc. to the breaker trip. In this case, it is a protection panel necessary to ensure stable operation of the system and prevent the spread of accidents.

      The breaker operation failure protection panel prevents the spread of accidents by tripping nearby breakers when a breaker fails, and as the interlock circuits for all breaker tripping and closing circuits are connected through the breaker failure protection panel, it has a high level of safety in the field of protection systems. This is a field that requires expertise as it requires technical experience and design ability, as well as an understanding of the system stabilization system itself and the know-how to test it.

      Protection relay for 345 [kV] circuit breaker failure protections uses both over current protection function for diagnosis of circuit breaker condition and circuit breaker failure initiation function (BFI) by circuit breaker control command. Thus it is composed into and applied to a system in order to prevent spread of fault, using both circuit breaker trip commands by protection system and detection of circuit breaker’s abnormal condition.

      GABO’s 345 [kV] circuit breaker failure protection panel has a protection relay (7SV600) made from SIEMENS, in order to guarantee reliability. By having accumulated knowledge in manufacturer technology of protection panel, and experienced professionals, we strive to accomplish noise immunity, stable earthing, durability, insulation, assembly, all of which being incorporated in order to generate products of credibility.

      CIRCUIT BREAKER FAILURE PROTECTION SYSTEM CONFIGURATION

      The circuit breaker failure protection system is divided into 2CB and 3CB depending on the number of circuit breakers, and its composition varies depending on the system equipment configuration. The equipment drawn from the system equipment is applied as a general transmission line or transformer structure.
      The circuit breaker operation failure protection panel waits for a certain period of time after the first stage to monitor operations due to user error and the operation of the transmission line or transformer protection panel (BF initation), and even after that time has passed, the current element (50BF) continues. It performs highly reliable protection duties by consisting of a two-stage system that detects what is present and trips nearby circuit breakers.

      DIVERSITY/SELECTIVITY OF PROTECTIVE FUNCTIONS

      SIEMENS' 7VK87 protection relay is a relay that includes 50BF, 79, and 25 functions related to circuit breakers. It implements circuit breaker operation failure protection using the dual 50BF function, and has a reclose function and synchronization check function for 345kV system equipment that applies single-phase trip. It can also be applied to fields including. Therefore, it is designed to be applicable to circuit breaker control and protection, thereby ensuring economic efficiency and reliability of the system.

      BREAKER FAILURE PROTECTION RELAY (7VK87) SPECIFICATION

      • - Digital Protection Relay with 32 Bit microprocessor
        - Independent high sensitive current detection on each phase.
        - Independent start/3 phase start detection function for each phase
        - 2-out-of-4 current detection function
        - Single-Stage, Two-Stage step-by-step application function
        - Zero Sequence, negative sequence current compensation
        - Provides user convenience such as remote correction and failure analysis functions through analysis programs

      MAIN FUNCTION

      - Circuit breaker failure (current/ circuit breaker condition observation) detection function.
      - Remote end transfer trip
      - Autoreclosing function and synchronous check function
      - End Fault protection
      - User defined logic (CFC-continuous function chart)
      - Function to prevent mal-function through many fault detection

      - Self-diagnosis
      - Selection possible to one pole/three pole trip function
      - Metering (current, voltage, active/ reactive power, etc)
      - Event recording function (trip, alarm, fail, etc)
      - Using any portable computing device, setting and fault analysis function
        (analysis program (DIGSI), Comrade File conversion function) becomes possible

      TECHNICAL SPECIFICATION/STANDARD

      Index Item Specification
      Rating Power Supply Voltage Input DC : 48~300[V], AC : 80~265[V] (Frequency 50/60[hz])
      Power Consumption Modular Type : Basemodule standard DC 13[W], AC 55[VA]/ Per expansion module : DC 3W, AC 6VA
      Analog Current(CT) 1[A] or 5[A], Burden : Approx. 0.1[VA]
      Power(PT) 0~200[V], Power Consumption < 0.1[VA]
      Digital input Number of input : Selectable by applying multiple expansion modules
      Voltage Range : 24 ~ 300[VDC]
      Digital output Number of output : Selectable by applying multiple expansion modules
      Allowable Current : 5[A](Continuous), 30A for 1s, 250A for 30ms
      Communication Communication Port RS-232, RS-485, Ethernet, FO(Fiber Optic)
      Protocol Profibus, DNP3.0, IEC61850, TCP/IP
      Time Synchronization DCF77/IRIG-B/SNTP/IEEE 1588