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SEL-7203

Distribution Transformer Protection Panel

SEL-7203 panels provide advanced protection and control for distribution transformers with a single high-/low-side transformer zone boundary. These panels include the following features:

  • Fully redundant differential protection 
  • Restricted earth fault (REF) protection 
  • Transformer through fault overcurrent backup protection 
  • High-speed bus protection using a zone interlock (fast bus blocking) scheme with a partial differential accommodating a single bus-tie breaker 
  • Time-coordinated system backup protection with a partial differential accommodating a single bus-tie breaker  
  • Breaker failure protection 
  • Trip circuit monitor
  • Transformer and breaker alarm monitoring
  • Remote breaker control via communications
  • Digital lockout and reset logic for 86T and 86BF
  • Battery and breaker wear monitoring
  • Sequential Events Recorder (SER)
  • Load profile reporting
  • Dimensions of 92" tall × 28" wide × 28" deep
  • Customizable wire labels to match your existing nomenclature
  • Customizable nameplates to meet your nomenclature needs
  • Drawing package
  • Automation and communications modules available

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Available Application Modules

787-751-Module

SEL-787/SEL-751 Transformer Protection Module

This module is always required and provides transformer differential and bus zone interlock protection using the SEL-787 Transformer Protection Relay, high-side breaker/circuit switching, motor-operated air break control, and sudden pressure tripping supervision. It also provides overcurrent through-fault and system backup protection using an SEL-751 Feeder Protection Relay and can perform direct transfer tripping if there is no local high-side interrupter.

SEL-787 Redundant Transformer Protection Module

SEL-787 Redundant Transformer Protection Module

This module is always required and provides redundant transformer differential protection, REF protection, overcurrent through-fault protection, and low-side breaker control and breaker failure protection.

If the station includes a bus-tie breaker, a version of the module that includes an SEL-751 breaker control relay is available. This relay provides breaker control with breaker failure, synchrocheck, and voltage monitor supervision. The tie breaker relay can also provide arc-flash protection if the buses are covered by arc-flash sensors.

9510 Breaker Module

SEL-9510 Control Switch module

This module provides independent local control and indication for up to four switching devices.

Lockout Module

Rotary Control Switch Module

This module provides independent local control and indication for up to three switching devices using rotary switches.

Rotary Control Module

Lockout Relay Module

This module provides independent mechanical lockout for the transformer protection (86T) and/or breaker failure protection (86BF) using rotary lockout switches.

Details

The Firmware IDs for older versions of the firmware can typically be found in Appendix A of the instruction manual.