Application Guide for Basler BE1-BPR Circuit Breaker Protection Relay

Basler BE1-BPR Circuit Breaker Protection Relay: A Complete Guide to Principles, Programming, and Field Applications

Product Overview and Application Positioning

The BE1-BPR circuit breaker protection relay launched by Basler Electric is a multifunctional protection device based on microprocessor design, specifically designed for circuit breaker failure protection and reclosing control in power systems. This relay adopts a three-phase+neutral line current monitoring architecture, integrating programmable logic controller (PLC) function and instantaneous overcurrent module, providing a complete solution from circuit breaker failure detection to multiple reclosing for power plants, substations, and industrial distribution systems.

The core value of BE1-BPR is reflected in three aspects: firstly, providing pre programmed circuit breaker failure logic solutions (3 standard types and 6 enhanced types), covering the vast majority of typical application scenarios; The second is the built-in BEST logic ™ Programmable logic engine, allowing users to customize protection logic without changing hardware; The third is the integration of comprehensive circuit breaker diagnostic functions, including contact wear monitoring, overheat protection of breaking resistors, arc detection, and IRIG-B high-precision time synchronization, upgrading the protection relay from a simple fault detection device to a circuit breaker health management platform.

The difference between the standard and enhanced BE1-BPR models is that the enhanced model additionally supports COMTRADE format fault recording (12 records, each containing 20 cycles of data), contact wear accumulation (I ² t) recording, and dual range current calibration function.

Core technical specifications

2.1 Current induction and fault detection

BE1-BPR provides two CT secondary rating options of 5A and 1A, which are connected to three-phase current and neutral line current through terminals 1-8:

5A CT: Continuous rated 20Aac, 1-second rated 500Aac

1A CT: continuous rated 4Aac, 1-second rated 80Aac

Three independent fault detectors (F1, F2, F3) can be independently configured for phase current or neutral line detection, and three digital filtering methods can be selected:

Type 1 (Instantaneous RMS Filter, 1 cycle): Typical startup time of 1 cycle, exit time of 1/4 cycle. The starting range is 0.25-9.99A under 5A CT (0.05-2.00A under 1A CT), with an accuracy of ± 2% or ± 0.05A. It is suitable for high-speed circuit breaker failure logic.

Type 2 (moving average filter, programmable window 1-100 cycles): The start/stop time depends on the window size and current multiplier, and the start range is 0.05-1.00A under 5A CT (0.01-0.20A under 1A CT). Suitable for weak current detection scenarios as low as 0.05A, such as circuit breaker break flashover monitoring.

Type 3 (Three phase Instantaneous RMS Filter): The performance is the same as Type 1, but it requires the three-phase current to exceed the starting value before outputting, suitable for symmetrical fault detection.

2.2 Timer System

BE1-BPR provides six independent programmable timers (T1~T6), each of which can be configured as a delay timer or a control timer:

Delay timer (D-type): It starts timing and outputs T [n] as true when the timing ends, until the reset input is valid before resetting. Suitable for circuit breaker failure delay output.

Control Timer (Type C): After starting, T [n] immediately becomes true, and when the timer ends, it becomes false, providing a finite time window. Suitable for limiting the "opportunity window" of circuit breaker failure operation.

Delay setting range: 10~999ms (1ms step), 1~60s (0.1s step), or 1~3600 cycles (1-cycle step), with a set value of 0 to disable the timer.

2.3 Recloser function

BE1-BPR has a built-in triple closing sequence, which can be configured through LR command:

Start input (START): Start the reclosing sequence when RESET is false

Reset input (RESET): Start the reset timer and close the CLOSE output

WAIT: Pause the reclosing sequence (for external locking)

Locked input (DTL): Immediately drive to the locked state (highest priority)

The three sets of reclosing delays (TD791, TD792, TD793) can be set to 0~999ms (1ms step), 1~99s (0.1s step), or 100~600s (1s step), respectively. Setting a value of 0 will cause the coincidence to fail and enter a locked state. The reset timer (TD79R) and coincidence failure timer (TD79F) provide sequence state management.

2.4 Output contacts and target indication

OUT1~OUT5: Isolated normally open contacts, OUT1 is a high-speed output (typical action time 4ms)

ALM (OUT A): normally closed alarm contact, closed when relay loses power or diagnostic alarm occurs

Output hold function (PHOLD): After the contact is closed, it holds for 200-250ms to ensure that the trip coil is not prematurely interrupted by the relay contact

Rated resistance value of output contact: 7A continuous at 120Vac; At 250Vdc, it can connect 30A (0.2s), carry 7A continuous current, and disconnect 0.3A.

Hardware architecture and front panel operation

3.1 Hardware composition

BE1-BPR adopts a pull-out chassis structure, supporting 19 inch rack installation or vertical panel installation (compatible with Basler M1, GE M1, Westinghouse FT31/FT32 and other standard openings). When the movement is pulled out, the internal CT circuit automatically short circuits without additional operation.