Eaton PT 10 Manual de usuario

PT 10/20/25 Trip Unit User Manual

Power Trip (PT) Units

Instruction Manual MN013018SC

Instructions apply to:：

CCC, new generation

IZM61 series air

circuit breaker

CCC, new generation

IZM65 series air

circuit breaker

CCC, new generation

IZM67 series air

circuit breaker

Instruction Manual

PT UNIT USER MANUAL APRIL 2023 www.eaton.com.cn

Contents

1. INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

1.1 Introduction to PT unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

2. PROTECTION AND METERING FEATURES.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2.1 Trip Unit Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

2.2 Protection Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

2.3 Current and Voltage Metering Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

2.4 Power and Energy Metering Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

2.5 Time Current Curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

3. POWER TRIP (PT) UNITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

3.1 Stats Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

3.2 Display and Navigation Buttons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

3.3 Password Protection Functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

3.4 Pickup/Cause-of-Trip Indicator. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

3.5 Rotary Switches (PT10 only). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

3.6 Reset Button . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

3.7 Door. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

3.8 USB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

3.9 Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

3.10 In Ratings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

3.11 Side Labels. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

4. PT PROTECTION SETTINGS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

4.1 Long Delay Pickup and Time Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

4.2 Short Delay Pickup and Time Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

4.3 Instantaneous Pickup Setting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

4.4 Ground Fault Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

4.5 Ground Fault Sensing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

4.6 Advanced Protections (PT20/25 only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . .14

4.7 High Instantaneous Protection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 15

4.8 Making Current Release (MCR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

4.9 Zone Selective Interlocking (ZSI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

4.10 Event Recording and Waveform Capture. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

4.11 Circuit Breaker Health Diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

iii

Instruction Manual

PT UNIT USER MANUAL APRIL 2023 www.eaton.com.cn

5. RELAY AND DIGITAL INPUT (PT 25 ONLY) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

5.1 Relay Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

5.2 Digital Input (DI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20

6. PT COMMUNICATION FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

6.1 Integrated Modbus-Remote Terminal Unit (RTU) Port. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21

6.2 USB Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21

7. IMPORTANT SYSTEM COMPONENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

7.1 Auxiliary Power. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21

7.2 Power Trip Protection Manager (PTM) Configuration Software. . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . .21

8. SECONDARY WIRING TERMINALS ASSOCIATED WITH THE PT TRIP UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

9. TESTING THE TRIP UNIT AND CIRCUIT BREAKER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

9.1 Functional Opening Test (Local) via Display. . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22

9.2 Simulated Current Test (Remote) via USB/PTM Configuration Software. . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . .22

9.3 Testing for Ground Fault Trip Unit – Primary Current Injected . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23

10. MAINTENANCE OF THE PT TRIP UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

10.1 Replacing the Battery. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23

10.2 Replacing the Trip Unit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24

11. RECORD KEEPING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

APPENDIX A – MODBUS COMMUNICATION PORT SETTING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . 26

A.1 Viewing/Setting Modbus Setpoints. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26

A.2 Network Communication Protocol. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26

A.3 Modbus Register Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26

APPENDIX B – TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Instruction Manual

PT UNIT USER MANUAL APRIL 2023 www.eaton.com.cn

WARNING

DANGEROUS ELECTRICAL VOLTAGE!

Do not attempt to install or perform maintenance

on equipment while it is energized. Death or severe

injury can result from contact with energized

equipment. Always verify that no voltage is present

before proceeding. Always follow safety procedures.

Eaton is not liable for misapplication or mis-

installation of its products.

Observe all recommendations, notes, cautions,

and warnings related to the safety of personnel

and equipment. Observe and comply with all

general and local health and safety laws, codes, and

procedures.

WARNING

Do not attempt to install, test, or perform

maintenance on equipment while it is energized.

Death or severe personal injury can result from

contact with energized equipment. De-energize

the circuit and disconnect the circuit breaker

before performing maintenance or tests. Any

tripping operation will cause disruption of service

and possible personal injury, resulting in the

unnecessary switching of connected equipment.

Testing a circuit breaker while it is in-service and

carrying load current is not recommended. Testing

of a circuit breaker that results in the tripping of

the circuit breaker should be done only with the

circuit breaker in the test or disconnected cassette

positions or while the circuit breaker is on a test

bench.

WARNING

Electrical shock or burn injury can occur when

working on power systems. Always turn off the

main power that is supplying the circuit breaker

before conducting tests. Test out of the cell, if

possible.

CAUTION

Exercise care when replacing the battery to ensure that

it is installed correctly. Accidentally installing the battery

in the reverse direction will not harm the trip unit nor the

battery but will defeat the function of the battery.

IMPORTANT

Auxiliary power is required to provide protection features.

1PT UNIT USER MANUAL APRIL 2023 www.eaton.com.cn

1. Introduction

1.1 Introduction to PT unit

The Power Trip (PT) unit, along with current sensors and a

trip actuator, is the subsystem of a circuit breaker which

provides the protective function. The PT unit analyzes signals

from the current sensors. If current level and time delay

settings are exceeded, then the PT unit will trip the circuit

breaker. The automatic over-load and short circuit tripping

characteristics for a specific circuit breaker are determined

by the current rating and user selected protection settings.

There is no mechanical or direct magnetic action between

the primary current side and the mechanical tripping parts of

the circuit breaker.

The PT unit consists of three modules: a frame module,

a control module and an auxiliary power module. The

control module contains a microcontroller that performs

true RMS current sensing measurements and calculations

for protection. It may be replaced in the field. The frame

module is matched to the ratings of the circuit breaker and

permanently attached to the circuit breaker frame. It should

not be removed or exchanged. The auxiliary power module is

EASY400-POW.

Figure 1. The PT Trip Unit.

1. Introduction

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Figure 2. Series IZM6 Circuit Breakers

IZM61

IZM65/67

The current sensors are internal to the circuit breaker frame

and consist of two coils: one coil on an iron core and one

coil on an air core (Rogowski coil). As current begins to flow

through the circuit breaker, the iron core coil generates a

secondary current which powers the trip unit. At the same

time, the air core coil provides signals which are processed to

determine the current through the circuit breaker.

The mechanical action required to initiate tripping of the

circuit breaker is provided by a special low-energy trip

actuator. This trip actuator is an integral part of the circuit

breaker mechanism which also includes a charging handle,

and manual “Open” and “Close” buttons. The trip actuator is

automatically reset by the mechanism.

The wiring diagrams show how certain functions of the trip

unit are connected to external circuits. All wirings are landed

on the secondary contact system directly above the circuit

breaker. See ZIM6 Air Circuit Breaker catalogue for the

secondary terminal board definitions.

1. Introduction

3PT UNIT USER MANUAL APRIL 2023 www.eaton.com.cn

2. Protection and Metering Features

2.1 Trip Unit Functions

Table 1. Trip Unit Functions.

Trip Unit Type Catalog Number

Protection

style LCD

Rotary

switch

Ground

fault Modbus RTU

Zone inter-

lock Relay output Digital input

PT 10 PT10 LSI •

PT10G LSIG • •

PT 20 PT20 LSI •

PT20G LSIG • •

PT20C LSI • •

PT20GC LSIG • • •

PT 25 PT25 LSI • • • • •

PT25G LSIG • • • • • •

Figure 3. PT10- Rotary

Switch Trip Unit Series

Figure 4. PT20/25- LCD Trip

Unit Series

2. Protection and Metering Features

4PT UNIT USER MANUAL APRIL 2023 www.eaton.com.cn

2.2 Protection Features

Table 2. Protection Features

Protection PT 10 PT 20/25

Long Delay

Protection (L)

Curve Slope I2t I2t, I4t, I0.5t, It

Long Delay Pickup (Ir)x (In)0.4, 0.5, 0.6, 0.7, 0.75, 0.8, 0.9,

0.95, 0.98, 1.0

0.4 to 1.0

Adjustable step is: 0.01

Long Delay Time @ 6 x (lr) Seconds 0.5, 1, 2, 4, 7, 10, 12, 15, 20, 24 0.5 - 24S 

Adjustable step is: 0.1S

Thermal Memory Included Included

High Load Alarm 1 % x (Ir)OFF or % High Load Alarm 2 Adjustable step is: 1.0% 

High Load Alarm 2 % x (Ir)OFF or % High Load Alarm 1 to 120% Adjustable step is: 1.0% 

Short Delay

Protection (S)

Curve Slope Fixed, I2tFixed, I2t

Short Delay Pickup x (Ir)1.5, 2, 2.5, 3, 4, 5, 6, 7, 8, 10 1.5~ 10S Adjustable step is 0.1S

Short Delay Time 8 x (lr) l2t Seconds 0.1, 0.2, 0.3, 0.5 0.1 ~ 0.5 Adjustable step is 0.01

Short Delay Time Flat Seconds 0.05, 0.1, 0.2, 0.3, 0.4, 0.5 0.05~ 0.5 Adjustable step is 0.01

Zone Interlock Enable/Disable 

Instantaneous

Protection Instantenous x (In)Off, 2, 4, 5, 6, 7, 8, 10, 12, 15 Off, 2 ~ 15 Adjustable step is 0.1

Neutral Protection 4th Pole or External Neutral Trip % x (Ir)0 (Off), 60, 100 0 (Off), 60, 100

Ground (Earth)

Fault Protection

(Option G)

Ground Fault Pickup x (In)Off, 0.2, 0.4, 0.6, 0.8, 1.0 OFF, 0.2~ 1.0 Adjustable step is 0.01

Ground Fault alarm x (In)0.2, 0.4, 0.6, 1.0 OFF, 0.2~ 1.0 Adjustable step is 0.01

Ground Fault Delay at

0.625 x (In) l2tSeconds 0.1, 0.2, 0.3, 0.4, 0.5 0.1~ 0.5 Adjustable step is 0.01

Ground Fault Delay Flat Seconds 0.1, 0.2, 0.3, 0.4, 0.5 0.1~ 0.5 Adjustable step is 0.01

Zone Interlock Enable/Disable 

Thermal Memory Included Included

General Over Temperature Trip °C 85°C 85°C

Health monitor alarm % 1~50 1~50

If I4t, I0.5t, and It slope is selected, not all times are available, consult time-current curves.

These settings on PT10 series modified with PTM.

Only PT 25 supports zone interlocking.

2. Protection and Metering Features

5PT UNIT USER MANUAL APRIL 2023 www.eaton.com.cn

Table 3. Advanced Protection Features (PT25 only, unless specified additionally)

Protection Unit Setting Note

Voltage Protection

Over-voltage Pickup V180-720 adjustable Interval of 1

Over-voltage Delay s1~ 300 adjustable Interval of 1

Under-voltage Pickup V60-670 adjustable Interval of 1

Under- voltage Delay s1- 300 adjustable Interval of 1

Voltage Unbalance Pickup % V 5- 25 adjustable Interval of 1

Voltage Unbalance Delay s1- 300 adjustable Interval of 1

Current Protection

Current Unbalance Pickup % A 5- 25 adjustable Interval of 1

Current Unbalance Delay s1- 300 adjustable Interval of 1

Phase Loss Pickup % A 75

Phase Loss Delay s1- 240 adjustable Interval of 1

Power Protection Reverse Power Pickup kW 1- 65500 adjustable Interval of 1

Reverse Power Delay s1- 300 adjustable Interval of 1

Frequency Protection

Over-frequency Pickup Hz 40- 70 adjustable Interval of 1 When Phase-A phase voltage

exceeds 100V, the frequency

metering will start

Over-frequency Delay s0.2- 5 adjustable Interval of 0.1

Under-frequency Pickup Hz 40- 70 adjustable Interval of 1

Under-frequency Delay s0.2- 5 adjustable Interval of 0.1

Phase Sequence Protection

Positive Sequence (A-B-C) 3-phase voltage sequence is the same as the

setting, and the trip unit acts

When all three phase voltages

exceed 100V, the phase sequence

metering will start

Reversed Sequence (A-C-B)

Demand Protection

Current Demand Pickup x (In)0.2-1.0 adjustable Interval of 0.1 PT20/25 supports this function

Current Demand Delay s15-1500 adjustable Interval of 1

Power Demand Pickup kW 1- 65500 adjustable Interval of 1

Power Demand Delay s15-1500 adjustable Interval of 1

2. Protection and Metering Features

6PT UNIT USER MANUAL APRIL 2023 www.eaton.com.cn

2. Protection and Metering Features

2.3 Current and Voltage Metering Data

Table 4. Current and Voltage Metering Data

Current Metering Unit Accuracy Notes

IA, IB, IC, IN, IG Amperes ±1.5% of Reading

Minimum IA, IB, IC, IN, IG Amperes ±1.5% of Reading Group values held until reset

Maximum IA, IB, IC, IN, IG Amperes ±1.5% of Reading Group values held until reset

Voltage Metering Unit Accuracy Notes

VAB, VBC, VCA Volts ±0.5% of Reading Line to Line Voltage

Minimum VAB, VBC, VCA Volts ±0.5% of Reading Group values held until reset

Maximum VAB, VBC, VCA Volts ±0.5% of Reading Group values held until reset

VAN, VBN, VCN Volts ±0.5% of Reading Line to Neutral Voltage

Minimum VAN, VBN, VCN Volts ±0.5% of Reading Group values held until reset

Maximum VAN, VBN, VCN Volts ±0.5% of Reading Group values held until reset

Accuracy applicable for 10% to 120% of In at the ambient temperature of 25°C.

Only the PT25 supports this function.

Accuracy applicable for the voltage of 50 to 690Vac at the ambient temperature of 25°C.

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