PRS-753 Line Protection
During the operation of power system, various failures and abnormal operating states may occur. The most common and also the most dangerous failure is the occurrence of various types of short circuits. Line protection mainly aims to address various failures in transmission lines. Different protection models can be selected according to the system conditions, such as single-circuit line, double-circuit line on the same tower, series capacitor compensation line, single channel and dual-channel, and diverse configuration methods can be chosen according to the actual requirements.
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Scope of Application
The PRS-753 is a numerical line differential and distance protection intended for protecting and monitoring various line arrangement of various voltage level, ranging from 1000kV to 110kV. PRS-753 can detect and clear all types of internal phase-to-phase and phase-to-earth faults locating within the line protection zone.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 60617
ANSI
CYG Code

Description

IEC 60617

Line Differential Protection

3dI>L

Mho distance protection

Z<

Quadrilateral distance protection,

Z<

Power Swing Blocking Releasing

ZPSBR

Out-of-Step Protection

φ<

Scheme communication logic for distance protection

-

Scheme communication logic for directional earth fault protection

-

Three Phase Directional Overcurrent Protection

3I> ->

Directional Earth Fault Overcurrent Protection

Io>->

Directional Negative-sequence Overcurrent Protection  

I2>

Breaker Failure Protection

3I>/I0>BF

Thermal Overload Protection

3lth>

Stub Differential Protection

3I>STUB

Pole Discordance Protection

PD

Reverse Power Protection

P>

Broken Conductor Protection

-

Three Phase Overvoltage Protection

3U>

Residual Overvoltage protection

2(U0>)

Three Phase Undervoltage Protection

3U<

Overfrequency Protection

f>

UnderFrequency Protection

f<

Synchrocheck

SYNC

Automatic Reclosure

O ->I

Faulty Phase Selection

-

Trip Logic

-

Fault Detector

-

OpticalFibre Communication

-

Current circuit supervision

-

Fuse failure supervision

FUSEF

CB Position Supervision

CBCM

Description

ANSI

Line Differential Protection

87

Mho distance protection

21

Quadrilateral distance protection,

21

Power Swing Blocking Releasing

68

Out-of-Step Protection

78

Scheme communication logic for distance protection

CL

Scheme communication logic for directional earth fault protection

CLN

Three Phase Directional Overcurrent Protection

67P

Directional Earth Fault Overcurrent Protection

67N

Directional Negative-sequence Overcurrent Protection  

67I2

Breaker Failure Protection

50BF

Thermal Overload Protection

49

Stub Differential Protection

50STB

Pole Discordance Protection

52PD

Reverse Power Protection

32R

Broken Conductor Protection

46BC

Three Phase Overvoltage Protection

59

Residual Overvoltage protection

59N

Three Phase Undervoltage Protection

27

Overfrequency Protection

81O

UnderFrequency Protection

81U

Synchrocheck

25SYN

Automatic Reclosure

79

Faulty Phase Selection

21FL

Trip Logic

94

Fault Detector

-

OpticalFibre Communication

-

Current circuit supervision

87

Fuse failure supervision

60

CB Position Supervision

CBCM

Description

CYG Code

Line Differential Protection

87L

Mho distance protection

21M

Quadrilateral distance protection,

21Q

Power Swing Blocking Releasing

PSBR

Out-of-Step Protection

78O

Scheme communication logic for distance protection

85

Scheme communication logic for directional earth   fault protection

85

Three Phase Directional Overcurrent Protection

67P

Directional Earth Fault Overcurrent Protection

67N

Directional Negative-sequence Overcurrent Protection  

67I2

Breaker Failure Protection

50BF

Thermal Overload Protection

49

Stub Differential Protection

87STB

Pole Discordance Protection

52PD

Reverse Power Protection

32R

Broken Conductor Protection

46BC

Three Phase Overvoltage Protection

59P

Residual Overvoltage protection

59N

Three Phase Undervoltage Protection

27P

Overfrequency Protection

81O

UnderFrequency Protection

81U

Synchrocheck

25SYN

Automatic Reclosure

79AR

Faulty Phase Selection

21FL

Trip Logic

94T

Fault Detector

FD

OpticalFibre Communication

FO

Current circuit supervision

CTS

Fuse failure supervision

VTS

CB Position Supervision

CBCM

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