BP-2CD Busbar Protection
Busbar is an important component of power plant and substation. When there is busbar failure of power plant or substation, if the fault is not removed in time, it may cause damage to many power equipment, affect the stability of power system, and cause power outage in substation. In severe circumstance, it may even cause collapse of the regional power system.Busbar protection is an important secondary system device to ensure safe and stable operation of the power grid, and its safety, reliability, sensitivity and fast response are of decisive significance to guarantee the safety of entire regional power grid. Therefore, it is very necessary to set up a busbar protection with safe operation, reliable action and good performance, so that the fault of busbar can be quickly detected and removed in a timely and selective manner.The BP microcomputer busbar protection independently developed by CYG SUNRI was introduced 1995. With the development of automation, digitization and intelligence of the power system, we have constantly innovated, and successively introduced digital, intelligent and distributed products.
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Scope of Application

The BP-2CD is a distributed busbar differential protection intended for protecting and monitoring various busbars of various voltage level, ranging from 1000kV to 110kV. BP-2CD can detect and clear all types of internal falults.

BP-2CD provides fast and selective protection, monitoring and control  for single busbar, single busbar with single bus coupler, double busbar,  double busbar with up to 4 bus couplers, 3/2 breaker  busbar, etc. The relay can operate correctly over a wide frequency range  in order to accommodate power system frequency variations during  disturbances.

This relay can sample the analog values from the traditional instrument  transformers, or receive the sampled values from the electronic current  and voltage transformers (via a merging unit). The binary inputs and  outputs of this relay can be configured according to the demands of a  practical engineering through the PRS IED Studio configuration tool  auxiliary software, which can meet some special requirements of  protection and control functions.

This relay can fully support the IEC61850 communication protocol and  GOOSE function, and can completely meet the demands of a modern  digitalized substation.

Advantages
01
This device is based on a 32-bit high performance dual-core processor, internal high speed bus and intelligent I/O ports, and the hardware is in modularized design and can be configured flexibly, featuring interchangeability and easy extension and maintenance.
02
Modularized hardware design makes this relay be easily upgraded or repaired by a qualified service person. Various function optional modules can satisfy various situations according to the different requirements of the users.
03
The adoption of 16-bit A/D converter and the dual-channel sampling technology can ensure the accuracy and reliability of protection sampling and the correctness of protection operation. It also provides dedicated current transformers for metering, and ensures the high accuracy of telemetering with 48-point high speed sampling rate per cycle.
04
This device can sample the analog values from the traditional instrument transformers, or receive the sampled values from the electronic transformers. It can support the protocol IEC60044-8, IEC61850-9-2 and GOOSE.
05
Various algorithms for protection and measurement have been completed in this device for the feature of electronic transformer sampling, such as the error prevention method of multi-algorithms data anomaly for the digital channels, to realize high accuracy and reliability under various conditions of network faults or communication interruption.
06
This device has powerful GOOSE functions, and the connection and cooperation between some devices can be realized without using electrical cables, to facilitate the realization of such functions as simple bus differential protection, overload interlock shedding function and backup automatic transfer function etc.
07
This device has fully realized the technology to integrate six functions into one device: protection, measurement, control, remote signaling, merging unit function and remote module functions, to improve the reliability.
08
Various methods of GPS time synchronization are supported in this relay, including SNTP, pulse per second (PPS) and IRIG-B synchronization.
09
The protection modules are completely separated from other modules, and are independent in both hardware and software. The protection functions do not depend on the communication network, so the failure of communication network will not affect the normal operation of the protection functions.
010
Mature protection configuration, fast speed and high security performance can meet the practical requirements. Each protective element is independent, so it is very convenient for whether adopting the selected protective element.
011
This device constantly measures and calculates a large amount of analog quantities, such as phase voltage, phase-to-phase voltage, neutral voltage, phase current, neutral current, active power, reactive power, power factor and frequency etc.
012
The human machine interface (HMI) with a small control module (a 240×128-dot LCD, a 9-key keypad and 19 LED indicators) on the front panel is very friendly and convenient to the user.
013
This device can communicate with a SAS or RTU via different communication intermediates: thernet network, RS-485 serial ports. The communication protocol of this device is optional: IEC61850, IEC60870-5-103, DNP3.0 or ModBus.
014
This device can detect the tripping circuit of the circuit breaker and monitor the operation (close or trip) time of a circuit breaker by checking the auxiliary contacts of the circuit breaker.
015
Complete event recording function is provided: 512 latest protection operation reports, 512 latest supervision records, 128 latest control operation records, 128 latest user operation records and 2000latest records of time tagged sequence of event (SOE) can be recorded.
016
Powerful fault and disturbance recording function is supported: 64 latest fault or disturbance waves, the duration of a wave recording is configurable.
Technical Features
IEC 61850
IEC 60617
ANSI

Description

IEC 61850

Protection

Busbar differential protection

-

Breaker failure protection

CC_RBRF

BC/BS Dead Zone Protection


Feeder End-fault Protection


Feeder Breaker Failure Protection

CC_RBRF

Phase OverCurrent Protection

OC_PTOC

Ground OverCurrent Protection

EF_PIOC

Pole Discordance Protection

CCPDSC

Supervision and monitoring

Fuse failure supervision

SEQRFUF

Current circuit supervision

CCRDIF

Description

IEC 60617

Protection

Busbar differential protection

3Id/I

Breaker failure protection

3I>BF

BC/BS Dead Zone Protection


Feeder End-fault Protection


Feeder Breaker Failure Protection

3I>BF

Phase OverCurrent Protection

3I>

Ground OverCurrent Protection

IN>>

Pole Discordance Protection

PD

Supervision and monitoring

Fuse failure supervision

FUSEF

Current circuit supervision

MCS 3I

Description

ANSI

Protection

Busbar differential protection

87B

Breaker failure protection

50BF

BC/BS Dead Zone Protection

50DZ

Feeder End-fault Protection

50FDZ

Feeder Breaker Failure Protection

50BF

Phase OverCurrent Protection

50/51P

Ground OverCurrent Protection

50/51G

Pole Discordance Protection

52PD

Supervision and monitoring

Fuse failure supervision

60

Current circuit supervision

MCS 31