Siemens Webcam 7SA511 User manual

7SA511 V2.2

Numerical Line Protection Relay

Operator Manual

Power

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Manual No. SG-8108-01

7SA511 Line Protection Relay Table of Contents

July 27, 1995 i

Table of Contents

User Guide

Chapter 1 Introduction..........................................................................................1-1

Chapter 2 Product Description ..............................................................................2-1

Chapter 3 Acceptance Tests ..................................................................................3-1

Chapter 4 Installation ............................................................................................4-1

Chapter 5 Programming the Relay.........................................................................5-1

Chapter 6 Displaying System and Relay Information..............................................6-1

Chapter 7 Commissioning the Relay ......................................................................7-1

Chapter 8 Maintenance..........................................................................................8-1

Reference Guide

Reference A. Method of Operation............................................................................ A-1

Reference B. Hardware and Software........................................................................ B-1

Reference C. Communications................................................................................... C-1

Reference D. Specifications.......................................................................................D-1

Reference E. Settings Calculations.............................................................................E-1

Reference F. Setting Worksheets...............................................................................F-1

Reference G. Input/Output Functions........................................................................G-1

7SA511 Line Protection Relay Table of Contents

ii July 27, 1995

The information contained herein is general in nature and not intended for specific application purposes. It does not relieve the user of

responsibility to use sound practices in application, installation, operation, and maintenance of the equipment purchased. Siemens reserves

the right to make changes in the specifications shown herein or to make improvements at any time without notice or obligation. Should a

conflict arise between the general information contained in this publication and the contents of drawings or supplementary material or both,

the latter shall take precedence.

Should further information be desired or should particular problems arise which are not covered sufficiently for the purchaser’s purposes,

the matter should be referred to your local sales office.

The contents of this manual should not become part of or modify any prior or existing agreement, commitment or relationship. The sales

contract contains the entire obligation of Siemens Energy & Automation, Inc. Any statements contained herein do not create new

warranties or modify an existing warranty.

7SA511 Line Protection Relay Chapter 1

July 27, 1995 1-1

Introduction

Table of Contents

1. Introduction........................................................................................................................1-3

1.1 Using This Manual.................................................................................................1-3

1.2 Glossary of Terms and Abbreviations.....................................................................1-4

1.3 Relay Model Number.............................................................................................1-6

List of Figures

Figure 1-1. Reading the 7SA511 Relay Model Number...........................................................1-7

7SA511 Line Protection Relay Introduction

July 27, 19951-2

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7SA511 Line Protection Relay Chapter 1

July 27, 1995 1-3

1. Introduction

1.1 Using This Manual

This operator’s manual is intended to provide you with all the information you need to install and

operate the Siemens 7SA511 Numerical Line Protection Relay. In addition to describing the

various tasks of operation, the manual offers general information about the functions and features

of the relay.

Several of the relay’s functions and features are optional, depending on the model ordering

number. This manual identifies all of the relay’s options and frequently refers you to section 1.3,

“Relay Model Number,” so you can determine which options your relay has.

This manual is divided into two parts:

• The User Guide describes how to install, program, operate and maintain the relay, so you

will need to read this part if you are to perform any of these tasks. General information

about the relay’s features and functions is also in this part of the manual.

• The Reference Guide includes the relay specifications, method of operation, relay setting

calculations and worksheets, and information on the relay’s hardware, software, and

communications capabilities. If you are responsible for the application and setting

calculation of the relay, you will need to read this part of the manual.

Refer to Table 1-1 for help in finding the information you need in this manual.

Table 1-1. Using This Manual.

If you want to . . . Then read . . .

learn more about the relay

Chapter 2, Product Description

Reference A, Method of Operation

Reference B, Hardware & Software

Reference C, Communications

determine the optional function(s)

available in your relay

Section 1.3, Relay Model Number

install the relay

Chapter 4, Installation

perform acceptance tests

Chapter 3, Acceptance Tests

program the relay

Chapter 5, Programming the Relay

Reference E, Setting Calculations

Reference F, Setting Worksheets

Reference G, Input/Output Functions

check relay status, target history

logs, and the event log

Chapter 6, Displaying System and Relay Information

place the relay in service or

perform maintenance

Chapter 7, Commissioning the Relay

Chapter 8, Maintenance

review relay specifications

Reference D, Specifications

7SA511 Line Protection Relay Introduction

July 27, 19951-4

This manual assumes you are using the relay’s operator panel to program, maintain, and operate

the relay. If you are using DIGSI

®

software or some other application to control the relay, refer

to the appropriate user guide when instructions in this manual are insufficient.

1.2 Glossary of Terms and Abbreviations

Following are definitions and descriptions of terms and abbreviations used in this manual that are

unique to power systems and to Siemens relay technology in particular.

Abbreviations and Acronyms

A/D

analog-to-digital

AR

automatic reclose

CB

circuit breaker

C/O

changeover

CT

current transformer

CW

codeword

DAR

delayed automatic reclose

E

earth or ground

EEPROM

electrically erasable, programmable read only memory

E/F

earth (ground) fault

EPROM

erasable, programmable read only memory

FD

fault detection; fault detector

FNo

function number

I.T.

inverse time

LCD

liquid crystal display (on the relay operator panel)

LED

light emitting diode (on the relay operator panel)

LSA

a substation (Siemens’ Localized Substation Automation system)

m

memorized

M/C

manual close

mcb or m.c.b.

miniature circuit breaker

NC

normally closed

nm

not memorized

NO

normally open

O/C

overcurrent

PC

personal computer

pcb

printed circuit board

PCO

parameter changeover

PLC

power line carrier

POTT

permissive overreach transfer trip (pilot protection scheme)

PUTT

permissive underreach transfer trip (pilot protection scheme)

RAM

random access memory

RAR

rapid automatic reclose

ROM

read only memory

TT

transmit time

VT

voltage transformer

7SA511 Line Protection Relay Chapter 1

July 27, 1995 1-5

Terms

annunciation

1. Activating the various relay outputs (LCD, LEDs, output relays)

when events occurs.

2. Messages that appear on the operator panel LCD in the event log or

target logs are also called annunciations.

binary input

A relay input terminal that responds to the presence or absence of voltage

on the terminal in a digital (on/off) manner.

block

1. Prevent normal operation or function.

2. Group of memory addresses.

compensated

(system)

The neutral system point is inductively grounded to compensate for the

distributed phase-to-ground system capacitance.

dead time

Time allowed following fault clearance before attempting an automatic

reclose.

drop-off

Drop-out (used in the LCD text).

drop-out

Return to a normal or no-fault state.

earth

Electrical ground.

fault loop

In phase-selective fault detection systems, this term describes the current

path for phase-to-phase or phase-to-ground faults. For example, if a short

circuit occurs between phase 1 (L1) and phase 2 (L2), the fault loop is

L1-L2. The currents and voltages of the fault loop are decisive when

calculating the distance to fault.

forward

Direction—normally downstream towards the line or load (i.e., toward the

protected component).

high-set

An overcurrent protection element that operates independently of the

definite time or inverse time elements and typically has a high pickup value

and a small or zero (instantaneous) time delay.

isolated (system)

The neutral system point is purposely not connected to ground

(ungrounded).

marshalling

Configuring the I/O units (LEDs, trip relays, etc.)

7SA511 Line Protection Relay Introduction

July 27, 19951-6

Terms

pickup

Activation of a protection function either through detection of a fault or as

a result of a binary input. The current and voltage levels or ratios that

cause a protection element to pick up are called pickup values.

reclaim time

The no-fault time period following automatic reclose that defines a

successful reclose

reverse

Direction—normally upstream towards the bus or source (i.e. away from

the protected object).

stage

A protection element; a group of protection parameters that, at a

minimum, include pickup and time delay values.

starpoint

Common connection point in wye-connected electrical equipment; the

neutral connection.

target

System device to which a command or signal is directed.

trip

Activate a trip relay or open a circuit breaker.

1.3 Relay Model Number

The model number for your 7SA511 relay is printed on the relay’s nameplate, which is located on

the operator panel (see Figure 2-1 in Chapter 2, “Product Description”). As illustrated in Figure

1-1, you can read your relay’s model number and determine the rated current, DC supply voltage,

type of mounting (flush or surface), type of fault detection, and which optional functions your

relay has. Using the model number allows you to verify that you have the correct relay for the

application.

This manual frequently refers you to the relay model number so you can determine whether or not

a particular section is applicable to your relay and protected system. When the model number is

used, the character(s) significant to the discussion is bold, and asterisks (*) are used to indicate

that the character is irrelevant to the discussion. For example, model number 7SA511*-**A5*-

**A/E* means the relay does not have the automatic reclose feature, so you can skip the sections

on automatic reclose.

7SA511 Line Protection Relay Chapter 1

July 27, 1995 1-7

Mounting construction

Fault detection options

Ground fault detection input

For grounded systems, ground current input for protected line only

For ungrounded systems, without parallel line compensation

For grounded systems, ground current input for parallel line compensation

Overcurrent fault detection

Overcurrent, Voltage-controlled Overcurrent, and Polygonal Impedance

fault detection

Overcurrent and Voltage-controlled Overcurrent fault detection

7SA511 A5

Line Protection Relay

Ratedcurrentat60/50HzAC

1A

5A

Rated power supply voltage VDC

24, 48 VDC

60, 110, 125 VDC

220, 250 VDC

1

2

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4

Surface mounting

Flush mounting

Communications interface (rear port)

Automatic reclose (AR)/Parameter changeover (PCO)

None

Isolated, hard-wired

Integrated fiber optic

without AR

with AR 3-pole

with AR 1/3-pole

without AR

with AR 3-pole

with AR 1/3-pole

without PCO

with PCO

without PS

with PS

without PS

with PS

without GF

with GF

Power swing (PS)/High-resistance ground fault protection (GF) *

1

2

3

0

1

2

A

B

C

A

C

F

B

E

G

0

2

1

3

B

C

* The Power swing (PS) option is only applicable when the fault detection system selected is the polygonal impedance detector (code = 2).

The High-resistance ground fault (GF) protection is only applicable for grounded systems, i.e., the ground fault detection Input code must be

0or2.

Figure 1-1. Reading the 7SA511 Relay Model Number.

7SA511 Line Protection Relay Introduction

July 27, 19951-8

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7SA511 Line Protection Relay Chapter 2

July 27, 1995 2-1

Product Description

Table of Contents

2. Product Description ............................................................................................................2-3

2.1 About the Relay.....................................................................................................2-3

2.2 Relay Features.......................................................................................................2-3

2.3 Relay Setting Types...............................................................................................2-4

2.3.1 Relay Setting Descriptions (by Address Block)........................................2-5

2.4 Overview of Protection Functions..........................................................................2-8

2.4.1 Distance Protection.................................................................................2-8

2.4.2 Emergency Overcurrent Protection.......................................................... 2-10

2.4.3 Power Swing Protection (optional).......................................................... 2-10

2.4.4 Pilot Protection.......................................................................................2-10

2.4.5 High-Sensitivity Ground Fault Protection for Ungrounded Systems

(optional).........................................................................................................2-10

2.4.6 High-Resistance Ground Fault Protection (optional)................................2-11

2.4.7 Automatic Reclose (optional)..................................................................2-12

2.4.8 Distance-to-Fault Location......................................................................2-12

2.5 Additional Functions and Features of the Relay......................................................2-13

2.5.1 Secured Data Storage..............................................................................2-13

2.5.2 Serial Data Ports.....................................................................................2-13

2.5.3 Multiple Parameter Sets (optional)..........................................................2-14

7SA511 Line Protection Relay Product Description

July 27, 19952-2

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7SA511 Line Protection Relay Chapter 2

July 27, 1995 2-3

2. Product Description

2.1 About the Relay

The 7SA511 line protection relay is a microprocessor-based relay designed to provide fast,

reliable, and selective clearance of all kinds of ground and phase faults on overhead lines and

cables being fed from one point or multiple points. The system can be radial, ring, or meshed

topography. The system starpoint can be solidly grounded, compensated (resonant grounded), or

isolated (ungrounded). This relay has 10 binary inputs, 5 trip relays, 11 signal relays, and 16 LED

indicators.

The relay can be flush or surface mounted and is easily programmed and operated using the

controls and keypad on the operator panel. The LEDs on the operator panel continuously display

relay status and target indication. When prompted, the LCD shows the system settings,

configuration settings, protection settings, measured values, calculated values, setting options,

event messages, and other operational information.

The relay can be connected to a PC or to a substation control system, enabling the user to analyze

data stored in the relay’s memory and to monitor the relay’s alarms and status signals.

7SA511 Line Protection Relay Product Description

July 27, 19952-4

2.2 Relay Features

Microprocessor-Based Technology

Fully Numerical Design

Five Distance Zones, Phase and Ground

Polygonal Impedance Characteristic

Selectable Forward, Reverse or

Nondirectional

Separate R-Setting for Phase and

Ground

Seven Independent Time Delays

Fault Detector Options

Overcurrent

Voltage-Controlled Overcurrent

Impedance

Pilot Logic Schemes

Permissive Overreach Transfer Trip

(POTT)

Permissive Underreach Transfer Trip

(PUTT)

Blocking

Unblocking

Directional Comparison

Directional Pilot Wire (requires

7PA5210)

Weak Feed Echo Keying Logic

Transient Blocking

Zone Extension Scheme

Reverse Interlock Bus Protection

Single/Three-Pole Trip

Single/Three-Pole Multi-Shot Reclosing

Loss of Potential Block

Overcurrent Protection as Backup for

Distance Protection

Power Swing Block/Trip

Close-Onto-Fault Protection

Isolated Ground Fault Detection

Directional High Resistance Ground

Fault Protection

Nonvolatile Memory for Settings and

Targets

Programmable Binary Inputs, LEDs,

Signal and Trip Relays

Four Independent Setting Groups

Fault Locating

Parallel Line Compensation Option

Fault Target Data

Fault Waveform Capture (0.83 ms

resolution for 60 Hz frequency)

Operations Event Log

Circuit Breaker Operations Counter

Accumulated Circuit Breaker

Interrupted Current (per pole)

Real-Time Clock

Circuit Breaker Trip Test Function

Circuit Breaker Reclose Test

Metering Functions (On-line)

Voltage

Current

Real Power (Watts)

Reactive Power (Vars)

Frequency

Impedances

Two Serial Ports (one standard, one

optional)

IEC 870-5 Communication Standard

Self-Monitoring

Draw Out Construction

2.3 Relay Setting Types

The relay requires four types of settings. The settings, described below, determine how the relay

recognizes and responds to operating conditions to protect your power apparatus equipment.

Each relay is delivered with a set of parameters that are preprogrammed at the factory. All of the

presettings are identified in Chapter 5, “Programming the Relay.”

Operating settings define the conditions under which the relay will function. These

include the setting of the real-time clock (time and date), choice of display language, and

7SA511 Line Protection Relay Chapter 2

July 27, 1995 2-5

choice of the data transmission rate for the front port. The operating settings also identify

what information is to be displayed in each of the two lines of the LCD for operational

messages and for fault messages.

The relay’s “Scope of Functions” settings are also considered part of the operating

settings. These settings indicate which functions are activated (EXIST) and deactivated

(NON-EXIST). Operating settings also indicate how the optional functions automatic

reclose and parameter changeover will operate.

System settings identify the protected power system and switchgear. Information such as

the system starpoint direction and condition, voltage transformer voltages, and current

transformer rated current is required. The relay’s distance protection and ground fault

protection functions use this information to compute the system’s protection requirements.

When the parameter changeover feature is available (see section 2.5.3), system settings

can vary between the parameter sets.

Protection settings such as for distance protection, pilot protection, and overcurrent

protection, specify the values that are used to identify fault conditions and are the majority

of settings the 7SA511 relay requires. Depending on your relay model (see section 1.3.3),

you may also need to indicate settings for power swing blocking protection or high-

resistance ground fault protection. When the parameter changeover feature is available

(see section 2.5.3), protection settings can vary between the parameter sets.

Relay configuration settings tell the relay how to process the input information and

logically associate it with the output devices. If desired, you can reassign the binary inputs,

annunciations, and the function of the relay’s output signals, trip relays, and LEDs.

Configuration is also referred to in this manual as programming or marshalling the relay.

2.3.1 Relay Setting Descriptions (by Address Block)

Each relay input and output setting is assigned to a four-digit address number that you must

access to display or change the setting. Address numbers are typically grouped in blocks

according to their function. Table 2-1 describes all of the primary address blocks used in this

relay. Your relay’s configuration determines which addresses you will be able to access.

Table 2-1. 7SA511 Relay Primary Address Blocks.

Address LCD Text Description

1000

PARAMETERS

1100 POWER

SYSTEM DATA

Program the protected system settings such as the system starpoint

condition, voltage transformer data, and current transformer data.

Also set the parameters for general line data.

1200 DIST. PROT.

GENERAL SETTINGS

Indicate whether distance protection is on or off, program the

direction of the distance protection directional elements, and set the

trip delays for the fault detection zones (T4 or T5).

1300 DIST. PROT.

INDEPEND. ZONES

Set the parameters for independent distance zones.

Zone Z1 delay T1

Zone Z2 delay T2

Zone Z3 delay T3

7SA511 Line Protection Relay Product Description

July 27, 19952-6

Address LCD Text Description

1400 DIST. PROT.

CONTROLLED ZONES

Set the parameters for controlled (overreach) zones.

Zone Z1B delay T1B

Zone Z1L delay T1L

1500 DIST. PROT.

FAULT DETECTION

Select the measurement control parameters for voltage-controlled

overcurrent fault detection or impedance fault detection.

1600 DIST. PROT.

FAULT DETECTION

Set the parameters for the fault detection program selected in

address 1500. Also used to set all parameters for overcurrent

detection only.

1700 FAULT LOOP

EARTHED NETWORK

Set the parameters for determination of a fault loop in a grounded

system

1800 FAULT LOOP

NON-EARTHED NET

Set the parameters for determination of a fault loop in isolated or

compensated systems.

2000 POWER SWING Select the type of power swing blocking protection (three options),

and set the power swing polygon and vector values.

2100 TELEPROTEC

PERM. UNDERREACH

Program the settings for pilot protection, permissive underreach

transfer scheme.

2200 TELEPROTEC

PER. OVERREACH

Program the settings for pilot protection, permissive overreach

transfer scheme. This includes setting the echo keying function on or

off, the echo delay time, signal duration, and transient blocking

time.

2600 EMERGENCY

OVERCURRENT PROT.

Program the settings for emergency overcurrent protection,

including turning the function on or off.

2800 FAULT

RECORDINGS

Turn the waveform capture function on or off, select whether

waveform capture is initiated by fault detection or by trip command,

and indicate whether waveform records will be sent to a

communications device connected to the front or to the rear port.

2900 MEAS. VALUE

SUPERVISION

Control the sensitivity of the measured values monitoring functions.

Also program the settings for the fuse failure monitor, if used.

3000 EARTH FAULT

NON-EARTHED NET

Configure the relay for ground fault detection in systems with an

isolated or compensated starpoint.

3100 EARTH FAULT

DIREC/NON-DIREC

Configure the relay for high-resistance ground fault protection in a

grounded system.

3200 EARTH FAULT

DIREC. COMPARISON

Configure directional comparison ground fault protection settings.

3300 EARTH FAULT

NON-DIRECTIONAL

Configure the relay for nondirectional ground fault protection.

3400 AUTO-RECLOS.

FUNCTIONS

Program how the auto-reclose function interacts with the protection

functions, and set reclose cycle times.

3800 FAULT

LOCATION

Configure the fault location function.

4000

TESTS

4200 DIRECTIONAL TEST Run the preprogrammed directional test of the individual

measurement loops. All six measurement loops should indicate the

correct direction of the load flow.

4300 CB-TEST

TRIP-CLOSE CYCLE

Run the preprogrammed trip-close test using the internal auto-

reclose function.

4400 CB TEST

LIVE TRIP

Check the operation of the circuit breaker tripping function and the

operation of the circuit breaker. This test is independent of the

automatic reclose function.

7SA511 Line Protection Relay Chapter 2

July 27, 1995 2-7

Address LCD Text Description

5000

ANNUNCIATIONS

5100 OPERATIONAL

ANNUNCIATIONS

Display operational and status events in chronological order

beginning with the latest event. Operational messages include

pickup and drop-out of enabled protections and alarms, pickup and

drop-out of binary inputs, signal outputs, trips, relay diagnostics, and

other relay operational information.

5200 LAST FAULT Display the target history log for the most recent system fault, from

fault detection until drop-out. The fault number, beginning fault

time and time resolution display first, followed by the applicable

annunciations. Fault annunciations are available for distance

protection, emergency overcurrent protection, fault location, high-

resistance ground fault protection, and the internal auto-reclose

function.

5300 2nd to LAST FAULT Display the target history log for the second to last fault. See address

5200 for available fault messages.

5400 3rd to LAST FAULT Display the target history log for the third to last fault. See address

5200 for available fault messages.

5500 ISOLATED

EARTH FLT DATA

Display the annunciations generated for the last three ground faults

for ungrounded systems (isolated or compensated).

5600 CB OPERAT.

STATISTICS

Display the circuit breaker operation statistics.

5700 OPERATIONAL

MEASURED VALUES

Display the operational measured values, which are calculated based

on the values entered for the protected system settings and on the

relay rated frequency. The data displays in absolute primary values

and in percent of the rated relay values.

5800 ISOL. E/F

MEASURED VALUES

For ungrounded systems, this address displays the measured values

that occurred during the last ground fault.

6000

MARSHALLING

6100 MARSHALLING

BINARY INPUTS

Configure the binary inputs.

6200 MARSHALLING

SIGNAL RELAYS

Configure the signal relays.

6300 MARSHALLING

LED INDICATORS

Configure the LEDs, including whether the indication is latched or

unlatched.

6400 MARSHALLING

TRIP RELAYS

Configure the trip relays.

6900 LSA CONFIGURATION Indicate whether the relay is part of a substation control system via

the rear communications port.

7000

OPERATING

PARAMETERS

Program the language selection, date format, substation

identification numbers for the relay; select which operational

messages to display, which fault event annunciations to display, etc.

7800 SCOPE OF FUNCTIONS Indicate which protection and operating functions are available in

the relay, e.g., emergency overcurrent protection, fault location

detection, internal auto-reclose, etc. Also identify the rated frequency

for the protected system.

7900 DEVICE

CONFIGURATION

Program how the auto-reclose function interacts with the protection

functions of the relay.

8000

DEVICE CONTROL

8100 SETTING

REAL TIME CLOCK

Set the date and time for the real-time clock. You can also specify a

difference time, which is primarily used to synchronize the relay’s

real-time clock with another reference.

7SA511 Line Protection Relay Product Description

July 27, 19952-8

Address LCD Text Description

8200 RESET Reset stored data including the LEDs, event log, and target log data.

8500 PARAMETER

CHANGE-OVER

Select which parameter set is to be active, and copy parameter sets.

2.4 Overview of Protection Functions

This section gives an overview of each of the 7SA511 relay protection functions, as listed below:

Distance protection

Emergency overcurrent protection

Power swing protection (optional)

Pilot protection

Ground fault detection for ungrounded systems (optional)

High-resistance ground fault protection for grounded systems (optional)

Automatic reclose (optional)

Distance-to-fault location

You should read the relay’s model number on the front of the operator panel to determine if your

relay has the optional protection functions. section 1.3 in the “Introduction” section of this manual

describes how to read and interpret the relay model number.

2.4.1 Distance Protection

Distance protection is the main function of the 7SA511 relay. It is characterized by high

measuring accuracy and flexible adaptation possibilities for the system characteristics. The

distinguishing distance protection features of the 7SA511 relay are briefly discussed in the rest of

this section.

Feature Description

Fault detection

options

Overcurrent fault detection (I

ph

>>). Use of this fault detection

scheme depends on high short circuit currents.

Voltage-controlled overcurrent (underimpedance) fault detection

(V</I>). An overcurrent detection scheme in which the pickup

value is voltage-controlled. The measured voltages, depending

on the selected settings, may be the phase-to-ground or the

phase-to-phase voltages.

Polygonal impedance (dogbone) fault detection (Z<). This

detection scheme uses calculated loop impedance values.

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