ComAp MainsPro G99TT User manual

Copyright © 2022 ComAp a.s.
Written by Vladimír Zubák
Prague, Czech Republic
ComAp a.s., U Uranie 1612/14a,
170 00 Prague 7, Czech Republic
Tel: [phone]
E-mail: [email protected], www.comap-control.com Global Guide
MainsPro
G99TT
Mains Decoupling Protection
Relay
SW version 1.0.0
1 Document information 6
2 Introduction of Installation and Operation Guide 8
3 Installation data 10
4 User interface 19
5 Introduction of Application Guide 29
6 Important Steps of MainsPro G99TT utilization 30
7 TRIP and Fault Reset 31
8 Protective features 33
9 Application tips 40
10 Introduction of Reference Guide 44
11 Technical data 45
12 Appendix 52

MainsPro G99TT 1.0.0 Global Guide 2
Table of contents
1 Document information 6
1.1 Clarification of Notation 6
1.2 About this guide 6
1.2.1 Installation and Operation Guide 6
1.2.2 Application Guide 6
1.2.3 Reference Guide 6
1.3 Legal notice 6
1.4 Document history 7
2 Introduction of Installation and Operation Guide 8
2.1 Purpose of this manual 8
2.2 Conformity declaration 8
2.3 Warnings 8
2.3.1 Dangerous voltage 8
2.3.2 Adjust the setpoints 9
3 Installation data 10
3.1 Dimensions 10
3.2 List of terminals 11
3.3 Wiring 11
3.3.1 "Star" connection 12
3.3.2 "Delta" connection 13
3.3.3 Connection with voltage transformers 13
3.3.4 Single-phase connection 14
3.3.5 Power supply 14
3.3.6 Relay outputs connection 15
3.3.7 Binary switches connection 16
3.4 Measurement range 16
3.5 Wiring examples 16
4 User interface 19
4.1 Front panel elements 19
4.1.1 Pushbuttons 20
4.1.2 Setpoints change 20
4.1.3 Reset operation time 21
4.1.4 Reset trip counters 21
4.1.5 TEST mode activation 21
4.1.6 Factory default 22

MainsPro G99TT 1.0.0 Global Guide 3
4.2 Mechanical sealing 22
4.3 Signalization LEDs 22
4.4 Measurement screens 24
4.5 Alarm messages 27
5 Introduction of Application Guide 29
5.1 Purpose of this manual 29
5.2 MainsPro G99TT typical usage 29
5.3 Typical applications of MainsPro G99TT protection relay 29
6 Important Steps of MainsPro G99TT utilization 30
7 TRIP and Fault Reset 31
7.1 TRIP 31
7.1.1 TRIP event 31
7.1.2 TRIP status 31
7.2 Fault reset 32
8 Protective features 33
8.1 ANSI 59 Overvoltage, ANSI 27 Undervoltage 33
8.2 Floating 10 minutes average overvoltage 34
8.3 ANSI 81H Overfrequency, 81L Underfrequency 34
8.4 ANSI 47 Voltage unbalance and angle asymmetry 36
8.4.1 Voltage unbalance 36
8.4.2 Positive sequence undervoltage, Negative sequence overvoltage 36
8.5 ANSI 78 Vector shift 37
8.5.1 Measuring principle 37
8.6 81R Rate Of Change Of Frequency (ROCOF) 38
8.7 Phase rotation, incorrect phase polarity 39
9 Application tips 40
9.1 Automatic return to mains 40
9.2 Binary switches 40
9.2.1 External trip 41
9.2.2 Fault reset 41
9.2.3 Alternative settings 41
9.2.4 Disable 41
9.2.5 CB Feedback 41
9.3 Counters 41
9.4 Timer 42
9.5 Start trip 42

MainsPro G99TT 1.0.0 Global Guide 4
9.6 TEST mode 42
10 Introduction of Reference Guide 44
10.1 Purpose of this manual 44
11 Technical data 45
11.1 Accuracies and reaction times 45
11.1.1 Operating area 45
11.1.2 Voltage measurement 46
11.1.3 Frequency measurement 46
11.1.4 Time delays accuracy 46
11.1.5 Loss of Mains reaction times 46
11.2 Technical parameters 46
11.2.1 Endurance to the power supply voltage fails 47
11.3 Factory default setting of MainsPro G99TT unit 47
12 Appendix 52
12.1 Library of Setpoints 53
12.1.1 Group: Basic 54
12.1.2 Group: V <>, A.V <> 57
12.1.3 Group: dU, A.dU 58
12.1.4 Group: f <>, A.f <> 59
12.1.5 Group: LOM, A.LOM 60
12.1.6 Group: f(BI) 61
12.1.7 Group: f(RE) 62
12.2 Library of Binary switches 63
12.2.1 Ext1 63
12.2.2 Ext2 63
12.2.3 Fault Reset 63
12.2.4 Alt Settings 63
12.2.5 Disable 63
12.2.6 CB Feedback 63
12.3 Relay outputs 64
12.3.1 CommTrpPer 65
12.3.2 !CommTrpPer 65
12.3.3 CommTrpImp 65
12.3.4 !CommTrpImp 65
12.3.5 CommSigImp 65
12.3.6 !CommSigImp 66
12.3.7 CommSigDel 66

MainsPro G99TT 1.0.0 Global Guide 5
12.3.8 !CommSigDel 66
12.3.9 U Sig 66
12.3.10 !U Sig 66
12.3.11 f Sig 67
12.3.12 !f Sig 67
12.3.13 LOM Sig 67
12.3.14 !LOM Sig 67
12.3.15 dU Sig 67
12.3.16 !dU Sig 68
12.3.17 Other Sig 68
12.3.18 !Other Sig 68
12.3.19 Alt Sig 68
12.3.20 TrpEndImp 68
12.3.21 !TrpEndImp 69
12.3.22 InternFail 69
12.3.23 !InternFail 69
12.3.24 BakTrpPer 69
12.3.25 !BakTrpPer 69
12.3.26 BakTrpImp 70
12.3.27 !BakTrpImp 70

MainsPro G99TT 1.0.0 Global Guide 6
1 Document information
1.1 Clarification of Notation 6
1.2 About this guide 6
1.3 Legal notice 6
1.4 Document history 7
1.1 Clarification of Notation
Note: This type of paragraph calls the reader’s attention to a notice or related theme.
IMPORTANT: This type of paragraph highlights a procedure, adjustment etc., which can cause a
damage or improper function of the equipment if not performed correctly and may not be clear at
first sight.
WARNING: This type of paragraph highlights a procedure, adjustment etc., which can cause a
damage or improper function of the equipment if not performed correctly and may not be clear at
first sight.
Example: This type of paragraph contains information that is used to illustrate how a specific function
works.
1.2 About this guide
1.2.1 Installation and Operation Guide
The Installation and Operation Guide serves for the personnel providing installation of the MainsPro G99TT
unit. It contains wiring and setting instructions needed for installation and commissioning of the unit. It also
contains introduction of the user interface and necessary procedures for setting and operation of the unit.
Although MainsPro G99TT is very simple and intuitive for the operating personnel, we recommend keeping a
hardcopy of this manual available permanently at the site where MainsPro G99TT unit is installed, to facilitate
the necessary service and operation tasks.
1.2.2 Application Guide
The Application Guide serves for the designers and engineers who process the necessary documentation
and implementation procedures on the site where MainsPro G99TT is installed. It contains detailed
description of MainsPro G99TT functionalities and their practical application.
1.2.3 Reference Guide
The Reference Guide contains library of setpoints, inputs and outputs functionalities and detailed technical
information. This information is referenced in the Installation and Operation Guide and Application Guide.
1.3 Legal notice
This End User's Guide/Manual as part of the Documentation is an inseparable part of ComAp’s Product
and may be used exclusively according to the conditions defined in the "END USER or Distributor LICENSE
AGREEMENT CONDITIONS – COMAP CONTROL SYSTEMS SOFTWARE" (License Agreement) and/or in
the "ComAp a.s. Global terms and conditions for sale of Products and provision of Services" (Terms) and/or in

MainsPro G99TT 1.0.0 Global Guide 7
the "Standardní podmínky projektů komplexního řešení ke smlouvě o dílo, Standard Conditions for Supply of
Complete Solutions" (Conditions) as applicable.
ComAp’s License Agreement is governed by the Czech Civil Code 89/2012 Col., by the Authorship Act
121/2000 Col., by international treaties and by other relevant legal documents regulating protection of the
intellectual properties (TRIPS).
The End User and/or ComAp’s Distributor shall only be permitted to use this End User's Guide/Manual with
ComAp Control System Registered Products. The Documentation is not intended and applicable for any
other purpose.
Official version of the ComAp’s End User's Guide/Manual is the version published in English. ComAp
reserves the right to update this End User's Guide/Manual at any time. ComAp does not assume any
responsibility for its use outside of the scope of the Terms or the Conditions and the License Agreement.
Licensed End User is entitled to make only necessary number of copies of the End User's Guide/Manual. Any
translation of this End User's Guide/Manual without the prior written consent of ComAp is expressly
prohibited!
Even if the prior written consent from ComAp is acquired, ComAp does not take any responsibility for the
content, trustworthiness and quality of any such translation. ComAp will deem a translation equal to this End
User's Guide/Manual only if it agrees to verify such translation. The terms and conditions of such verification
must be agreed in the written form and in advance.
For more details relating to the Ownership, Extent of Permitted Reproductions Term of Use of the
Documentation and to the Confidentiality rules please review and comply with the ComAp’s License
Agreement, Terms and Conditions available on www.comap-control.com.
Security Risk Disclaimer
Pay attention to the following recommendations and measures to increase the level of security of ComAp
products and services.
Please note that possible cyber-attacks cannot be fully avoided by the below mentioned recommendations
and set of measures already performed by ComAp, but by following them the cyber-attacks can be
considerably reduced and thereby to reduce the risk of damage. ComAp does not take any responsibility for
the actions of persons responsible for cyber-attacks, nor for any damage caused by the cyber-attack.
However, ComAp is prepared to provide technical support to resolve problems arising from such actions,
including but not limited to restoring settings prior to the cyber-attacks, backing up data, recommending other
preventive measures against any further attacks.
Warning: Some forms of technical support may be provided against payment. There is no legal or factual
entitlement for technical services provided in connection to resolving problems arising from cyber-attack or
other unauthorized accesses to ComAp's Products or Services.
1.4 Document history
Revision number Related SW Date of issue Author
1 1.0.0 11.6.2019 Vladimír Zubák
6back to Document information

MainsPro G99TT 1.0.0 Global Guide 8
2 Introduction of Installation and
Operation Guide
2.1 Purpose of this manual 8
2.2 Conformity declaration 8
2.3 Warnings 8
6back to Table of contents
Congratulations to your purchase of ComAp MainsPro G99TT unit! MainsPro G99TT is a microprocessor-
based protective relay, providing a comprehensive set of protective and supplementary functionalities. The
basic protective functions are:
Voltage
Frequency
Loss of mains
This covers the basic requirements for mains-decoupling (inter-tie) protection, but allows also usage in many
applications where benefits of the unit’s unique functionality is needed.
2.1 Purpose of this manual
The Installation and Operation Guide serves for the personnel providing installation of the MainsPro G99TT
unit. It contains wiring and setting instructions needed for installation and commissioning of the unit. It also
contains introduction of the user interface and necessary procedures for setting and operation of the unit.
Although MainsPro G99TT is very simple and intuitive for the operating personnel, we recommend keeping a
hardcopy of this manual available permanently at the site where MainsPro G99TT unit is installed, to facilitate
the necessary service and operation tasks.
2.2 Conformity declaration
Following described machine complies with the appropriate basic safety and health requirement
of the EC Low Voltage Directive No: 73/23 / EEC and EC Electromagnetic Compatibility Directive
89/336 / EEC based on its design and type, as brought into circulation by us.
2.3 Warnings
IMPORTANT: Be aware that the relay outputs can change state during and after the unit setting
(before the unit is used again ensure that the proper setting is done)!!!
IMPORTANT: Be aware that the devices connected to binary outputs of the unit may operate
upon disconnection of power supply, measurement inputs and/or binary inputs!!!
2.3.1 Dangerous voltage
In no case touch the terminals for voltage and current measurement!
Always connect grounding terminals!
Before accessing potentially life-threatening live parts the device must be isolated or disconnected from

MainsPro G99TT 1.0.0 Global Guide 9
dangerous voltage.
2.3.2 Adjust the setpoints
All parameters are adjusted to their typical values. However the setpoints have to be checked and adjusted to
their required values before the first starting of the gen-set.
The following instructions are for qualified personnel only. To avoid personal injury do not perform any action
not specified in related guides for product.
Note: ComAp believes that all information provided herein is correct and reliable and reserves the right to
update at any time. ComAp does not assume any responsibility for its use unless otherwise expressly
undertaken.
6back to Introduction of Installation and Operation Guide

MainsPro G99TT 1.0.0 Global Guide 10
3 Installation data
3.1 Dimensions 10
3.2 List of terminals 11
3.3 Wiring 11
3.4 Measurement range 16
3.5 Wiring examples 16
6back to Table of contents
3.1 Dimensions

MainsPro G99TT 1.0.0 Global Guide 11
3.2 List of terminals
BIC Binary inputs – COM terminal
BI1 – BI4 Configurable binary inputs
UA1 to 3 First set of voltage measurement terminals (UA).
Terminals UA1 and UA2 are internally interconnected
UB1 to 3 Second set of voltage measurement terminals (UB).
Terminals UB1 and UB2 are internally interconnected
UC1 to 3 Third set of voltage measurement terminals (UC).
Terminals UC1 and UC2 are internally interconnected
11, 21, 31, 41, 51 RE1-5 relay contact – common
12, 22, 32, 42, 52 RE1-5 relay contact – normally closed
(during fault-free conditions maintained in open position)
14, 24, 34, 44, 54 RE1-5 relay contact – normally open
(during fault-free conditions maintained in closed position)
L/+ Power supply – high range 85-265 VAC / 110 – 370 VDC
+ Power supply – low range 8 – 40 VDC. Connect "+" pole to this terminal
N/- Common terminal for power supply.
In case of DC supply, connect "–" pole to this terminal
3.3 Wiring
3.3.1 "Star" connection 12
3.3.2 "Delta" connection 13
3.3.3 Connection with voltage transformers 13
3.3.4 Single-phase connection 14
3.3.5 Power supply 14
3.3.6 Relay outputs connection 15
3.3.7 Binary switches connection 16

MainsPro G99TT 1.0.0 Global Guide 12
3.3.1 "Star" connection
If used for rated voltage 230 VAC ph-N, set the setpoint Uin (page 54) to 230 V, for systems with rated
voltage 120VAC ph-N, set the setpoint Uin (page 54) is to 120V. No additional setting is necessary for
indication of "Star" connection - MainsPro G99TT provides automatic detection of phase-neutral voltage
measurement. MainsPro G99TT provides over-range to 130% of the rated voltage, i.e. 300 VAC for 230 V
system and 156 V for 120 V system with no change of measurement accuracy.

MainsPro G99TT 1.0.0 Global Guide 13
3.3.2 "Delta" connection
In this arrangement, MainsPro G99TT is rated for 400 VAC ph-ph with over-range to 130% = 520 VAC with no
change of measurement accuracy. Setpoint Uin (page 54) is to be set to 400 V, no additional setting is
necessary for indication of "Delta" connection. MainsPro G99TT provides automatic detection of phase-
phase voltage measurement.
3.3.3 Connection with voltage transformers
MainsPro G99TT allows connecting HV or other measurement transformers with secondary rated voltage
100V. Provide the "Star" or "Delta" arrangement on the primary windings of the transformers and connect the
secondary 100 V to the MainsPro G99TT measurement inputs. Setpoint Uin (page 54) is to be set to 120V.
This setting provides the guaranteed measurement accuracy for the 100V inputs with overrange to 120V *
130% = 156 VAC.
Note: It is recommended to use "Delta" arrangement on the HV side to avoid nuisance tripping caused by
phase voltage unbalance.

MainsPro G99TT 1.0.0 Global Guide 14
3.3.4 Single-phase connection
MainsPro G99TT provides support for single-phase applications. Use the UA terminals to connect the
measured voltage to the unit and set the setpoint System (page 54) to 1ph. Use the same setting of rated
voltage selection as mentioned above.
3.3.5 Power supply
MainsPro G99TT provides set of 3 terminals for the purpose of dual power supply range:
8 - 40 VDC: use the terminals + and N/-
85 - 265 VAC / 110-370 VDC: use the terminals L/+and N/-

MainsPro G99TT 1.0.0 Global Guide 15
For proper connection of the power supply, see also the printed sign on the MainsPro G99TT unit:
Requirements for power supply connections
The unit is suitable for permanent connection to the power supply. The power supply circuits must have
sufficient current stability, corresponding to the appropriate power supply range and comply with the
standards relevant for the installation.
Note: External power supply is recommended in order to avoid excess of allowed supply voltage (256Vrms,
respectively 370V of peak value including dc offset).
Please be aware that not all power meters can detect the supply voltage including the dc component!
Note: The difference between power supply voltage and measured voltage must not exceed 1kV (peak-to-
peak), otherwise external power supply with appropriate voltage stability is recommended to use. For
isolated, ungrounded systems external, galvanically isolated power supply is recommended in all cases.
Requirements for power supply disconnecting device:
In case of power supply from AC voltage, the unit must be equipped by circuit breaker or contactor, marked as
disconnecting device in accordance with the EN 61010-1 standard.
IMPORTANT: The power supply circuit 8-40 VDC is internally interconnected with the supply
circuit 85-265 VAC. In case of operation with both power supply terminals connected, keep in
mind, that a failure of insulation in the AC power supply may cause propagation of AC voltage
into the circuits of low safe DC voltage, due to galvanic interconnection of both circuits!
3.3.6 Relay outputs connection
For safety purposes, it is recommended to set all MainsPro G99TT relay outputs to inverse logic for failure
trips and signaling. This means that under fault-free conditions all contacts are kept in energized position. In
trip or out-of-range signaling state, the contacts de-energize. In case of power-supply fail, the unit
automatically moves to fault-signaling by de-energizing the output relays, assuring safety disconnection of
the controlled devices. These outputs are marked with exclamation mark (i.e.!CommTrpPer).
However, the outputs can be set to normal logic which means, that in fault-free state all contacts are kept in
de-energized position. In trip or out-of-range signaling state, the contacts energize. These outputs are without
exclamation mark (i.e.CommTrpPer).

MainsPro G99TT 1.0.0 Global Guide 16
Relay outputs in MainsPro G99TT are freely assignable by the setpoints f(RE).
In default configuration, RE1 serves as the permanently energized common trip output contact
(!CommTrpPer (page 65)). Use this contact to operate the connector devices with permanently
energized inputs.
In default configuration, RE2 serves as an impulse common trip contact (CommTrpImp (page 65)). Use
this contact to operate e.g. opening or UV coil of circuit breakers.
Remaining 3 relay outputs serve for signaling of any sensed failure.
The arrangement of RE1 to 4 outputs in default configuration corresponds to the functionality of the
previous NPU-FUV unit outputs.
3.3.7 Binary switches connection
MainsPro G99TT provides 4 galvanically isolated binary switches with configurable functionality. These
inputs allow connection of any voltage free contact between the common terminal BIC and the appropriate
functional contact (BI1 – BI4).
Particular functions (Ext1, Ext2, Fault Reset, Alternative settings, Disable, CB Feedback) are freely
assignable by setpoint in Group: f(BI) (page 61).
Note: It is not possible to assign the same function to two different Binary Inputs.
For full description see Library of Binary switches on page 63.
3.4 Measurement range
MainsPro G99TT allows using multiple voltage ranges on the measurement inputs with unchanged
measurement accuracy. The following ranges are applicable:
230 V - this range applies in case of "star" connection of the 3-phase system using nominal 230V phase to
neutral. It may be also used for single-phase applications 230V phase to neutral. Overshoot by 30% up to
290V is possible for this measurement range. For this case, set the setpoint Uin (page 54) to 230/400V.
MainsPro G99TT will adjust automatically the measurement method, to assure the defined accuracy for
the measured voltage 230 V.
400 V - this range applies in case of "delta" connection of the 3-phase system using nominal 400V phase
to phase. Overshoot by 30% up to 520V is possible for this measurement range. For this case, set the
setpoint Uin (page 54) to 230/400V. MainsPro G99TT will adjust automatically the measurement method,
to assure the defined accuracy for the measured voltage 400 V.
120 V - this range is applicable in countries using 120 V nominal voltage phase to neutral. Another
application is for the high-voltage and other applications, using voltage transformers from rated voltage to
100 V. The guaranteed accuracy applies to both ranges 100 and 120 V. Overshoot by 30% up to 156V is
possible for this measurement range. For this case, set the setpoint Uin (page 54) to 120V.
3.5 Wiring examples
This chapter provides examples of possible wiring of MainsPro G99TTwhich can be used as a preparation
concept of wiring scheme.
Note: ComAp bears no responsibility of functionality of the solution where these concepts are applied.
1. Under normal conditions the undervoltage coil is powered. In case of fault, the voltage is lost and the
breaker undervoltage coil opens.

MainsPro G99TT 1.0.0 Global Guide 17
2. Under normal conditions the Off coil is not powered and contacts are open. In case of failure, the contacts
(12) close and the voltage is applied on the Off coil, therefore auxiliary power supply (e.g.UPS) is
necessary to provide voltage for the Off coil.

MainsPro G99TT 1.0.0 Global Guide 18
3. Under normal conditions the contacts are closed, in case of failure the contacts open. This wiring is
typically used for coil driven contactors.
6back to Installation data

MainsPro G99TT 1.0.0 Global Guide 19
4 User interface
4.1 Front panel elements 19
4.2 Mechanical sealing 22
4.3 Signalization LEDs 22
4.4 Measurement screens 24
4.5 Alarm messages 27
6back to Table of contents
4.1 Front panel elements
Number Description
4 x 20 Alpha-numerical display
Mechanical sealing indication
Frequency measurement
3-phase voltage measurement
Last trip indication
Last trip timer
Control and navigation pushbuttons
Fault Reset button

MainsPro G99TT 1.0.0 Global Guide 20
Number Description
TRIPLED
Singalization LEDs
Mechanical seal
4.1.1 Pushbuttons
In the measurement screens, use the ↑ and ↓ arrow buttons to browse through the measured values as
displayed on the 4x20 alphanumerical display. See the chapter Measurement screens (page 24) to get
the basic orientation.
To enter the setpoints menu, push the → button. For setpoints change, see Setpoints change on page
20.
To enter the init screen, to reset operation time, perform factory default reset, reset statistics or enter the
Test mode, push the ENTER and ESC at the same time. Together with the init screen display, the unit
performs lamp test by simultaneous cycling of all LEDs through all indication colors.
For confirmation of any value change or query, use the ENTERbutton.
For leaving any value change or query screen without change, use ESC button.
From any screen, press and hold the ESC button for 2 seconds to return back to the main measurement
screen (homepage).
4.1.2 Setpoints change
1. Push the → button to open the setpoints menu.
2. Use buttons ↑ and ↓ to browse through the menu. The setpoint groups are displayed in a cyclical order, i.e.
from the last setpoint group by button ↓, the cursor moves to the first group and vice versa.
3. Use button → to enter the setpoint group, by button ←, move one level up in the setpoint tree. The
setpoints are displayed in a cyclical order, i.e. from the last setpoint by button ↓, the cursor moves to the
first one and vice versa.
4. Press → to access the setpoint screen. Here you can change the setpoint value. The setpoint range is
shown at the bottom row.
5. The change is done by orders, starting from the least important digit. Use the buttons ← and → to move
between the digits. Use the buttons ↑ and ↓ to edit the digit. Please note, that the value is not limited by the
parameters limits during editing, but if an out-of-limits value is set-up, it will not be allowed to be stored in
the unit memory (the change may not be confirmed).
6. After the setpoint change is done, press ENTER to confirm the set value, or ESC to leave the setpoint
change screen without saving the changes.
Note: The unit allows mechanical sealing of selected setpoints by the black switch in left-bottom corner of the
unit (for information what setpoints are sealing protected see Factory default setting of MainsPro G99TT
unit (page 47)). If locked, the icon of closed padlock will appear on the position of setpoint change and the
setpoints may not be changed. Also, the padlock icon will be seen on the "homepage" measurement screen.
Once the setpoint change screen is entered and afterwards the sealing position is changed, the padlock
indication is not changed, but the internal lock is applied immediately.