GE DR60 User manual

GE
Grid Solutions
DR60
Digital Recorder
Technical Manual
Platform Hardware Version: A
Platform Software Version: 2
Publication Reference: DR60-TM-EN-2.1A
imagination at work

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DR60-TM-EN-2A
CONTENTS
Chapter 1: Introduction 6
1Foreword 6
1.1 Target Audience 6
1.2 Nomenclature 6
1.3 Abbreviations 7
2Product Scope 8
3Unpacking 8
4External Indication 8
4.1 DR60 Nameplate 8
5Key Features 9
6Compliance 10
7Functional Overview 10
8Programs Under the GPL License 10
9Ordering Options 13
Chapter 2: Safety Information 15
1Health and Safety 15
2Symbols 15
3Installation, Commissioning and Servicing 16
3.1 Lifting Hazards 16
3.2 Electrical Hazards 17
3.3 Fusing Requirements 18
3.4 Equipment Connections 19
3.5 Pre-energization Checklist 20
3.6 Peripheral Circuitry 20
3.7 Upgrading/Servicing 21
4Decommissioning and Disposal 21
5Standards Compliance 22
5.1 EMC Compliance: 22
5.2 Product Safety 22
5.3 R&TTE Compliance 23
Chapter 3: Design 25
1Hardware Architecture 25
2Mechanical Implementation 25
2.1 DR60 Connections Overview and Indicators 26
3Frequency Calculation 28
Chapter 4: Configuration 29
1DR60 Configurator Tool 29
1.1 Main Screen 29
1.2 Configuration Tabs 30
1.3 Status Bar 32
2Access Levels 32
3Communication Setup and Configuration Files Use 33

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DR60-TM-EN-2A
3.1 Configuring Communication Parameters 34
3.2 Creating a New Configuration File 35
3.3 Receiving an Equipment Configuration File 35
3.4 Opening a Pre-existing Configuration File 36
3.5 Saving a Configuration File 36
3.6 Sending a Configuration File for the Equipment 36
4Tools 36
4.1 LOG 37
4.2 Administrative Tools 37
5Configuration Tabs 38
5.1 General 38
5.2 Analog 38
5.3 Binary 40
5.4 Communication 41
5.5 Synchronization 48
5.6 Recording 51
5.7 Triggering 53
6Monitoring and Web Interface 57
7Alarm and Warning Reporting 58
Chapter 5: Records 61
1Wave Form Records 61
1.1 Recorded Values 61
1.2 Recording Times by Trigger 61
1.3 Sampling Rate 62
1.4 Trigger Burst Limiter 62
2Re-trigger and Record Concatenation 62
3Disturbance and Continuous Disturbance Records 63
3.1 Recorded Values 63
3.2 Recording Times by Trigger 66
3.3 Sampling Rate 67
3.4 Trigger Burst Limiter 67
4Trend Recorder 67
5SOE - Sequence of Events Records 67
5.1 Sampling Rate 67
6Record Format and Naming, and Mass Storage Capacity 67
6.1 Record Format 67
6.2 Record Naming 68
6.3 Mass Storage Capacity 69
7Record Management and Access 69
7.1 Creating Installations 70
7.2 Creating Devices 70
Chapter 6: PMU 71
1Synchrophasor Measurement and Broadcast 71
1.1 Reported Values 71

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DR60-TM-EN-2A
1.2 Accuracy Limits 71
1.3 Communication Ports, Transmission Rates 72
1.4 Configuration 72
1.5 Transmission Protocol 74
1.6 Communication Mode 75
1.7 Standards Compliance 75
1.8 PMU Specification 76
Chapter 7: Communications 79
1Communication Interfaces –Slot B 79
1.1 Electrical and Optical Ethernet 79
1.2 Serial Port 80
2Communication Ports and Protocols 81
3Recovering the DR60 IP Address 82
4Accessing the Equipment 82
4.1 Web Interface Minimum Requirements 82
Chapter 8: Installation 83
1Handling the Goods 83
1.1 Receipt of the Goods 83
1.2 Unpacking the Goods 83
1.3 Storing the Goods 83
1.4 Dismantling the Goods 84
2Normal Use of the Equipment 84
3Mounting the Device 84
3.1 DR60 Mechanical Installation 84
4Cables and Connectors 85
4.1 Power Supply Connections 86
4.2 Powering Up 87
4.3 Earth Connection 88
4.4 IN SERVICE Contact 89
4.5 Optical IRIG-B Input 90
4.6 Serial ports 90
4.7 I/O Nomenclature 91
4.8 Binary Inputs and Outputs 92
4.9 Voltage and Current Analog Inputs 96
5Case Dimensions 98
5.1 DR60 Dimensions and Weight 98
5.2 Panel Cutout 99
5.3 Accessories 99
6DR60 Configurator Tools Installation 100
6.1 Minimal requirements 100
Chapter 9: Maintenance 102
1Maintenance 102
1.1 Maintenance Checks 102
1.2 Back up and restore settings 103

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DR60-TM-EN-2A
1.3 Measurement Accuracy 103
1.4 Replacing the Unit 103
1.5 Cleaning 104
1.6 Watchdog 104
2DR60 Troubleshooting 104
3DR60 Firmware Update 104
4Equipment Return 105
5Instructions for Equipment Repair/Service for Service Personnel 105
Chapter 10: Technical Specifications 107
1DR60 Specifications 107
1.1 Power Supply 107
1.2 Ethernet Ports 107
1.3 Optical IRIG-Input 108
1.4 Serial Ports 108
1.5 Dry-contact Relay Outputs 109
1.6 Analog Acquisition 110
1.7 Voltage Inputs 110
1.8 Current Inputs 111
1.9 DC Transducer Inputs 112
1.10 Binary Inputs 112
1.11 Binary Outputs 113
1.12 Environmental Conditions 113
1.13 Type Tests DR60 114
1.14 Safety Tests 116
1.15 Environmental tests 116
1.16 Dimensions 117
Chapter 11: Wiring Diagrams 118
1Connection Diagrams of the Voltage Inputs 118
2Connection Diagrams of the Current Inputs 120
Appendix A –Equipment Log 123
1Equipment Log 123

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DR60-TM-EN-2A
DR60
Digital Recorder
Chapter 1: Introduction
This chapter provides some general information about the technical manual and an
introduction to the device(s) described in this technical manual.
1Foreword
This technical manual provides a functional and technical description of GE Reason
DR60, as well as a comprehensive set of instructions for using the device. The level at
which this manual is written assumes that you are already familiar with protection
engineering and have experience in this discipline. The description of principles and
theory is limited to that which is necessary to understand the product.
We have attempted to make this manual as accurate, comprehensive and user-friendly
as possible. However, we cannot guarantee that it is free from errors. Nor can we state
that it cannot be improved. We would therefore be very pleased to hear from you if you
discover any errors, or have any suggestions for improvement. Our policy is to provide
the information necessary to help you safely specify, engineer, install, commission,
maintain, and eventually dispose of this product. We consider that this manual provides
the necessary information, but if you consider that more details are needed, please
contact us.
All feedback should be sent to our contact center via the following URL:
http://www.gegridsolutions.com/alstomenergy/grid/grid/contactcentre
1.1 Target Audience
This manual is aimed towards all professionals charged with installing, commissioning,
maintaining, troubleshooting, or operating any of the products within the specified
product range. This includes installation and commissioning personnel as well as
engineers who will be responsible for operating the product.
The level at which this manual is written assumes that installation and commissioning
engineers have knowledge of handling electronic equipment. Also, system and
protection engineers have a thorough knowledge of protection systems and associated
equipment.
1.2 Nomenclature
Due to the technical nature of this manual, many special terms, abbreviations and
acronyms are used throughout the manual. Some of these terms are well-known
industry-specific terms while others may be special product-specific terms used by GE.

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DR60-TM-EN-2A
1.3 Abbreviations
AC - Alternating Current;
COMNAME - IEEE C37.232 Recommended Practice for Naming Time Sequence Data
Files;
COMTRADE - IEEE C37.111 Common Format for Transient Data Exchange;
CID –Configured IED Description
DC - Direct Current;
DFR –Digital Fault Recorder;
EMC - Electromagnetic Compatibility;
FRQ - Frequency;
GOOSE - Generic Object Oriented Substation Events;
GPS - Global Positioning System;
HTML - HyperText Markup Language;
IMB - Imbalance;
IEEE - Institute of Electric and Electronic Engineers;
IEC - International Electrotechnical Commission;
IED - Intelligent Electronic Devices;
IP - Internet Protocol;
IRIG-B -Inter Range Instrumentation Group (Rate Designation B);
KML - Keyhole Markup Language;
MAC - Media Access Control;
MODBUS - Modicon Bus;
PC - Computer;
PMU - Phasor Measurement Unit;
Pst - Short-term flicker severity;
Plt - Long-term flicker severity;
RAM - Random-access Memory;
RFC, DEFLATE - RFC 1951, DEFLATE Compressed Data Format Specification;
RMS - Root Mean Square;
SCADA - Supervisory Control and Data Acquisition;
SCD –Substation Configuration Description
SCL - Edit Configuration File for the GOOSE Configurator;
SNTP - Simple Network Time Protocol;
SOE - Sequence of Events;
SQL - Structured Query Language;
SSD - Solid-state Drive;
TCP - Transmission Control Protocol;
THD - Total harmonic distortion;
TTL –Transistor-transistor-logic;
TW - Travelling Wave;
UDP - User Datagram Protocol;
UTC - Coordinated Universal Time;
VLAN - Virtual Local Area Network;
XML - Extensible Markup Language.

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DR60-TM-EN-2A
2Product Scope
The DR60 a single-box solution for Digital Recording. The solution is designed for the
acquisition, monitoring and recording of electrical quantities normally associated with
electrical power generation, transmission or distribution equipment. The DR60 is
designed fan-less and no rotating part components. It has a 16-bit acquisition system
that provide an acquisition rate of 256 or 512 samples/cycle synchronized by the IRIG-B
or IEEE 1588 PTPv2.
The DR60 has a very flexible architecture with several different boards with allows the
customer to choose the most cost-effective solution for each application. Depending on
the boards combination, the DR60 can offer: up to 32 analog channels, 96 digital
channels and 48 digital outputs
The DR60 is a native IEC 61850 device, which means that all its internal variables follow
the data models and logical nodes described in the IEC 61850 edition 2. The DR60 is
able to publish and subscribe to GOOSE messages, as well as publish Report control
blocks for supervisory system integration.
It allows communication through the electrical Ethernet ports or optical interfaces.
3Unpacking
Unpack the equipment carefully and make sure that all accessories and cables are put
away so they will not be lost.
Check the contents against the packing list. If any of the contents listed is missing,
please contact GE immediately (see contact information at the beginning of this
manual).
Examine the equipment for any shipping damage. If the unit is damaged or fails to
operate, notify the shipping company immediately. Only the consignee (the person or
company receiving the unit) can file a claim against the carrier for occasional shipping
damages.
We recommend that the user retain the original packing materials for use in case of
need to transport or ship the equipment at some future time.
4External Indication
4.1 DR60 Nameplate
Information about the company, power supply, the serial number and part number is
shown on a small nameplate affixed to the rear of the equipment, as shown in figure
below.

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DR60-TM-EN-2A
Location of Serial Number, Part Number and specifications
5Key Features
The DR60 presents the following key features:
•Acquisition system:
▪16-bit opto-isolated analog-to-digital converters, independent for each
channel (50/60 Hz channels);
▪256 and 512 samples/cycle (50/60 Hz channels);
▪Frequency response of DC to approximately 3.0 kHz;
▪Opto-isolated digital inputs
▪Internal time skew compensation;
▪Sampling rate synchronized to external time reference;
•Channel capacity:

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DR60-TM-EN-2A
▪Up to 16 voltage inputs;
▪Up to 16 current inputs;
▪Up to 16 transducer voltage inputs;
▪Up to 16 transducer current inputs;
▪Up to 96 digital inputs;
Note: Maximum capacity of channels depends on boards combination
•Fan-less and no rotating part design
•Waveform recorder at 256 and 512 samples/cycle;
•Disturbance and continuous disturbance at 1, 2 or 4 samples/cycle;
•IRIGB-004 and IEEE 1588 PTPv2
•Trigger using Boolean logic equations;
•GOOSE publisher and subscriber (up to 256 GOOSE inputs)
•MMS report control block publisher
•Cross-trigger using GOOSE messages;
•RS232 serial ports for configuration;
•1 failsafe contact (normally closed dry contact relay);
6Compliance
The device has undergone a range of extensive testing and certification processes to
ensure and prove compatibility with all target markets. A detailed description of these
criteria can be found in the Technical Specifications chapter.
7Functional Overview
It is a single-box solution design for substation environment and offers a very
flexible combination of boards, which allows the customers to have up to 32 analog
inputs and up to 96 binary inputs. These characteristics along with binary outputs options
and two Ethernet ports, make the DR60 ideal to monitor up to 3 bays (considering 8
analog and 16 binary inputs per bay).
The DR60 provides a cost-effective solution for disturbance recording through a
distributed approach. It can be installed locally on a per-feeder basis or interconnected
via peer-to-peer GOOSE messaging that allows cross-triggering to occur without the need
to hard-wire the contacts, providing a scalable solution to station-level recording.
The DR60 complements relays by providing independent, high fidelity waveform
capture. It provides Waveform recorders, SOE and triggered and continuous disturbance
recorders - not typically found even in the most advanced digital relays. It also provides
features such GOOSE publisher and subscriber and MMS report control blocks for
integration with supervisory systems.
8Programs Under the GPL License
The DR60 uses GPL licenses in its implementation according to the following table:

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DR60-TM-EN-2A
PACKAGE
LICENSE
glibc
GPLv2+ (programs), LGPLv2.1+, BSD-3c, MIT (library)
linux-
headers
GPLv2
bash
GPLv3+
busybox
GPLv2
ncurses
MIT with advertising clause
readline
GPLv3+
e2fsprogs
GPLv2, libuuid BSD-3c, libss and libet MIT-like with
advertising clause
util-linux
GPLv2+, BSD-4c, libblkid and libmount LGPLv2.1+,
libuuid BSD-3c
zlib
zlib license
ethtool
GPLv2
gptfdisk
GPLv2+
htop
GPLv2
irqbalance
GPLv2
lighttpd
BSD-3c
pcre
BSD-3c
mtd
GPLv2
mxml
LGPLv2+ with exceptions
netsnmp
Various BSD-like
openssl
OpenSSL or SSLeay
openssh
BSD-3c BSD-2c Public Domain
parted
GPLv3+
pps-tools
GPLv2+
sudo
ISC BSD-3c
uboot-tools
GPLv2+
vsftpd
GPLv2
linux
GPLv2
kermit
BSD
libiec61850
GPLv3
mms-client
GPLv3
ntp-
internal
ntp license

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DR60-TM-EN-2A
ptpd-
internal
BSD

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DR60-TM-EN-2A
9Ordering Options
Variants
Order Number
1-4
5
6
7-8
9-
10
11-
12
13-
14
15-
16
17-
18
19-
20
21
22-23
24
25
Model type:
DR60 Digital Recorder
DR
60
Slot A - Power Supply
24-48 Vdc
1
100-250 Vdc / 110-240 Vac
3
Slot B - Hardware Options
Processing unit + two RJ45 copper 10/100BASE-TX Ethernet
interfaces
E
Processing unit + two multimode LC-type connector 100BASE-FX Ethernet
interfaces
O
Slot C - Binary I/O
16 x 24/48/125/250 V binary inputs
B1
6 x 24/48/125/250 V binary inputs and 8 x binary outputs
B2
Not installed
XX
Slot D - Binary I/O
16 x 24/48/125/250 V binary inputs
B1
6 x 24/48/125/250 V binary inputs and 8 x binary outputs
B2
Not installed
XX
Slot E - Flexible I/O Options
16 x 24/48/125/250 V binary inputs
B1
6 x 24/48/125/250 V binary inputs and 8 x binary outputs
B2
4 x VT 115 V and 4 CT 1/5 A RMS measurement analog inputs
ME
4 x VT 115 V and 4 x CT 1 A RMS protection analog inputs
P1
4 x VT 115V and 4 x CT 5 A RMS protection analog inputs
P5
4 x ±10 Vdc and 4 x 0-20 mAdc transducer inputs
DC
Not installed
XX
Slot F - Flexible I/O Options
16 x 24/48/125/250 V binary inputs
B1
6 x 24/48/125/250 V binary inputs and 8 x binary outputs
B2
4 x VT 115 V and 4 CT 1/5 A RMS measurement analog inputs
ME
4 x VT 115 V and 4 x CT 1 A RMS protection analog inputs
P1
4 x VT 115V and 4 x CT 5 A RMS protection analog inputs
P5
4 x ±10 Vdc and 4 x 0-20 mAdc transducer inputs
DC
Not installed
XX
Slot G - Flexible I/O Options
16 x 24/48/125/250 V binary inputs
B1
6 x 24/48/125/250 V binary inputs and 8 x binary outputs
B2
4 x VT 115 V and 4 CT 1/5 A RMS measurement analog inputs
ME
4 x VT 115 V and 4 x CT 1 A RMS protection analog inputs
P1
4 x VT 115V and 4 x CT 5 A RMS protection analog inputs
P5
4 x ±10 Vdc and 4 x 0-20 mAdc transducer inputs
DC

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DR60-TM-EN-2A
Not installed
XX
Slot H - Flexible I/O
Options
16 x 24/48/125/250 V binary inputs
B1
6 x 24/48/125/250 V binary inputs and 8 x binary outputs
B2
4 x VT 115 V and 4 CT 1/5 A RMS measurement analog inputs
ME
4 x VT 115 V and 4 x CT 1 A RMS protection analog inputs
P1
4 x VT 115V and 4 x CT 5 A RMS protection analog inputs
P5
4 x ±10 Vdc and 4 x 0-20 mAdc transducer inputs
DC
Not installed
XX
Primary Functions
Phasor Measurement Unit (PMU)
**
Waveform recorder
**
Disturbance Recorder
**
Continuous Disturbance Recorder
**
Trend Recorder
**
Secondary Functions
Standard Issue
1
Firmware Version
Latest available firmware - 02
02
Warranty
Standard warranty
0
Hardware Design Suffix
Initial version
A
Issue B

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DR60-TM-EN-2A
DR60
Digital Recorder
Chapter 2: Safety Information
This chapter provides information about the safe handling of the equipment. The
equipment must be properly installed and handled in order to maintain it in a safe
condition and to keep personnel safe at all times. You must be familiar with information
contained in this chapter before unpacking, installing, commissioning, or servicing the
equipment.
1Health and Safety
Personnel associated with the equipment must be familiar with the contents of this
Safety Information.
When electrical equipment is in operation, dangerous voltages are present in certain
parts of the equipment. Improper use of the equipment and failure to observe warning
notices will endanger personnel.
Only qualified personnel may work on or operate the equipment. Qualified personnel
are individuals who are:
•familiar with the installation, commissioning, and operation of the equipment
and the system to which it is being connected.
•familiar with accepted safety engineering practices and are authorized to
energies and de-energies equipment in the correct manner.
•trained in the care and use of safety apparatus in accordance with safety
engineering practices
•trained in emergency procedures (first aid).
The documentation provides instructions for installing, commissioning and operating the
equipment. It cannot, however cover all conceivable circumstances. In the event of
questions or problems, do not take any action without proper authorization. Please
contact your local sales office and request the necessary information.
Each product is subjected to routine production testing for Dielectric Strength and Protective
Bonding Continuity
2Symbols

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DR60-TM-EN-2A
Throughout this manual you will come across the following symbols. You will also see
these symbols on parts of the equipment.
Caution: Refer to equipment documentation. Failure to do so
could result in damage to the equipment
Risk of electric shock
Ground terminal. Note: This symbol may also be used for a
protective conductor (ground) terminal if that terminal is
part of a terminal block or sub-assembly.
Protective conductor (ground) terminal
Chassis functional earth terminal
Both direct and alternating current
Instructions on disposal requirements
The term 'Ground' used in this manual is the direct equivalent of the European term
'Earth'.
3Installation, Commissioning and Servicing
3.1 Lifting Hazards
Many injuries are caused by:
•Lifting heavy objects
•Lifting things incorrectly
•Pushing or pulling heavy objects
•Using the same muscles repetitively
Plan carefully, identify any possible hazards and determine how best to move the
product. Look at other ways of moving the load to avoid manual handling. Use the
correct lifting techniques and Personal Protective Equipment (PPE) to reduce the risk of
injury.

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DR60-TM-EN-2A
3.2 Electrical Hazards
All personnel involved in installing, commissioning, or servicing
this equipment must be familiar with the correct working
procedures.
Consult the equipment documentation before installing,
commissioning, or servicing the equipment.
Always use the equipment as specified. Failure to do so will
jeopardize the protection provided by the equipment.
Removal of equipment panels or covers may
expose hazardous live parts. Do not touch until the
electrical power is removed. Take care when there
is unlocked access to the rear of the equipment.
Isolate the equipment before working on the
terminal strips.
Use a suitable protective barrier for areas with
restricted space, where there is a risk of electric
shock due to exposed terminals.
Disconnect power before disassembling. Disassembly of the
equipment may expose sensitive electronic circuitry. Take
suitable precautions against electrostatic voltage discharge (ESD)
to avoid damage to the equipment.
NEVER look into optical fibers or optical output connections.
Always use optical power meters to determine operation or signal
level.
Testing may leave capacitors charged to dangerous voltage levels.
Discharge capacitors by reducing test voltages to zero before
disconnecting test leads.
If the equipment is used in a manner not specified by the
manufacturer, the protection provided by the equipment may be
impaired.
Operate the equipment within the specified electrical and
environmental limits.

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DR60-TM-EN-2A
Before cleaning the equipment, ensure that no connections are
energized. Use a lint free cloth dampened with clean water.
Integration of the equipment into systems shall not interfere with
its normal functioning.
The functioning of the device has been certified under the
circumstances described by the standards mentioned in
Technical Specifications chapter (item Type Tests). Usage of the
equipment in different conditions from the specified in this
manual might affect negatively its normal integrity.
The equipment shall have all their rear connectors attached even
if they are not being used, in order to keep their levels of ingress
protection as high as possible
Never manipulate liquid containers near the equipment even
when it is powered off.
Avoid modification to the wiring of panel when the system is
running.
VT circuits must never be left short circuited.
3.3 Fusing Requirements
A high rupture capacity (HRC) fuse type with a maximum current
rating of 10 Amps and a minimum dc rating of 250 V dc may be
used for the auxiliary supply (for example Red Spot type NIT or
TIA). Alternatively, a miniature circuit breaker (MCB) of type C,
10A rating, compliant with IEC 60947-1 and IEC 60947-3 may be
used.
Digital input circuits should be protected by a high rupture
capacity NIT or TIA fuse with maximum rating of 10 A, or
equivalent MCB as above. For safety reasons, current transformer
circuits must never be fused. Other circuits should be
appropriately fused to protect the wire used.
Reason devices contain an internal fuse for the power supply
which is only accessed by opening the product. This does not
remove the requirement for external fusing or use of an MCB as
previously mentioned. The ratings of the internal fuses are:
DR60 unit: 2 Amp, type T, 250V rating

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DR60-TM-EN-2A
CTs must NOT be fused since open circuiting them may produce
lethal hazardous voltages.
3.4 Equipment Connections
Terminals exposed during installation, commissioning and
maintenance may present a hazardous voltage unless the
equipment is electrically isolated.
Tighten M3 clamping screws of heavy duty terminal block
connectors to a nominal torque of 1.0 Nm.
Tighten captive screws of header-type (Euro) terminal blocks to
0.5 Nm minimum and 0.6 Nm maximum.
Always use insulated crimp terminations for voltage and current
connections.
Always use the correct crimp terminal and tool according to the
wire size.
In order to maintain the equipment’s requirements for
protection against electric shock, other devices connected to the
DR60 shall have protective class equal or superior to Class I.
Watchdog (self-monitoring) contacts are provided to indicate
the health of the device on some products. We strongly
recommend that you hard wire these contacts into the
substation's automation system, for alarm purposes.
Earth the equipment with the supplied PCT (Protective
Conductor Terminal).
Do not remove the PCT.
The PCT is sometimes used to terminate cable screens. Always
check the PCT’s integrity after adding or removing such earth
connections.
The user is responsible for ensuring the integrity of any
protective conductor connections before carrying out any
other actions.

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DR60-TM-EN-2A
The PCT connection must have low-inductance and be as short
as possible. For best EMC performance, ground the unit using
a 10 mm (0.4 inch) wide braided grounding strap.
All connections to the equipment must have a defined
potential. Connections that are pre-wired, but not used,
should be earthed, or connected to a common grouped
potential.
Pay extra attention to diagrams before wiring the equipment.
Always be sure that the connections are correct before
energizing the circuits.
3.5 Pre-energization Checklist
Check voltage rating/polarity (rating label/equipment
documentation).
Check CT circuit rating (rating label) and integrity of
connections.
Check protective fuse or miniature circuit breaker (MCB)
rating.
Check integrity of the PCT connection.
Check voltage and current rating of external wiring,
ensuring it is appropriate for the application.
3.6 Peripheral Circuitry
Do not open the secondary circuit of a live CT
since the high voltage produced may be lethal to
personnel and could damage insulation. Short
the secondary of the line CT before opening any
connections to it.
Reason devices DO NOT feature any automatic CT shorting feature. Therefore,
external shorting of the CTs is mandatory. Check the equipment documentation
and wiring diagrams carefully.