Introduction Sepam protection relays, the product of experience


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PE50773

Introduction

Sepam protection relays, the product of experience

Sepam, a complete range of protection relays.
Schneider Electric, by your side in over 190 countries.
Sepam for reliability and quality, from design on through to operation
b Design based on dependability studies, complying with the functional-safety requirements of standard IEC 61508. b Product development and manufacturing certified ISO 9001. b Environmentally friendly manufacturing certified ISO 14001. b Service quality ensured by decentralized logistics and support b Compliance with international standards and local certification.

A complete range for many different needs
Protection relays constantly monitor the power network and trip the circuit breakers to isolate the faulty portion under fault conditions: overload, short-circuit, insulation fault. The Sepam range of protection relays is designed for all protection applications in medium-voltage public and industrial distribution networks. It is made up of four series of relays with increasing performance levels: b Sepam series 10 for simple applications. b Sepam series 20 for usual applications. b Sepam series 40 for demanding applications. b Sepam series 80 for custom applications.
A multi-functional range of digital relays
Each Sepam series offers all the functions required for the intended application: b effective protection of life and property b accurate measurements and detailed diagnosis b integral equipment control b local or remote indications and operation.
A Sepam solution for every application
For each electrotechnical application, Sepam offers the relay suited to the protection needs of your network: b substations (incomer or feeder type) b transformers b motors b generators b busbars b capacitors.
Schneider Electric, a global offer
World leader in power & control Schneider Electric makes electricity safe, as well as facilitating and improving its use.
Worldwide presence Schneider Electric contributes to customer performance through its unique selection of products, solutions and services, as well as its dynamic policy of innovation.
Over 13 000 points of sale and 205 factories in 190 countries You can be sure of finding the range of products meeting your needs and complying perfectly with local standards. Our technicians are always on hand to provide solutions tailored to your needs and all the technical assistance you may require.
Schneider Electric, vast experience in protection relays
Breaking new ground back in 1982, Merlin Gerin launched Sepam 10, the first multifunctional, digital protection relay. Today, with the extended Sepam range (series 10, 20, 40 and 80), you benefit from over 30 years of experience on the part of the Schneider Electric R&D teams. More than 250 000 Sepam relays have been installed in over 130 countries and in every sector of activity: b energy production and distribution b infrastructure: airports, tunnels, public transportation, water treatment b industry: automobile, mines, semiconductors, metallurgy, petrochemicals b commercial sector: shopping centres, hospitals.

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Selection guide for all applications

Panorama of Sepam applications

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The selection guide proposes the types of Sepam suited to your protection needs.

Sepam series 10
For simple applications
Characteristics b 4 logic inputs b 7 relay outputs b 1 communication port

PB103452-32

Sepam series 20
For usual applications
Characteristics b 10 logic inputs b 8 relay outputs b 1 communication port b 8 temperature-sensor inputs

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DE53219

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Sepam series 40
For demanding applications
Characteristics b 10 logic inputs b 8 relay outputs b logical-equation editor b 1 communication port b 16 temperature-sensor inputs

Sepam series 80

For custom applications

Characteristics

b 42 logic inputs

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b 23 relay outputs

b logical-equation editor

b 2 communication ports for

multi-master or redundant

architectures

b 16 temperature-sensor

inputs

b removable memory

cartridge containing settings

and parameters for rapid

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return to service

b user-machine interface

with mimic for local control

M

in complete safety

b optional Logipam

programming software for

specific functions

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DE53224

DE53225



Selection guide for all applications

Panorama of Sepam applications

Protection functions

basic

specific

phase-overcurrent and earth-fault protection

Applications

Substation

Busbars

Series 10 A Series 10 B

Transformer

Motor

Series 10 A Series 10 B Series 10 N

Generator

Capacitor

current
voltage and frequency

breaker failure

S20 S23

disconnection by "rate of change of frequency"

current, voltage and frequency

directional earth fault
directional earth fault and phase overcurrent

S40 S41 S42

T20 T23 B21 B22
T40 T42

current, voltage and frequency
current, voltage and frequency
current, voltage and frequency

directional earth fault directional earth fault and phase overcurrent
disconnection by "rate of change of frequency"
transformer or transformermachine differential
machine differential
voltage and frequency protection for two sets of busbars

S80 S81 S82
S84

current, voltage and capacitor-bank

frequency

unbalance

B80 T81 T82
T87
B83

M20
G40 M41
M81 G82
M88 G88 M87 G87
C86



PB103446

Presentation
Sepam series 10.


Presentation of Sepam series 10

Sepam series 10 is a high-quality protection relay that represents the most costeffective solution available for essential protection functions. Highly ergonomic, it is easy to install and set up.
Sepam series 10 specifics
Sepam series 10 monitors phase and/or earth-fault currents. Three models meet a wide range of different needs : b N: Sepam series 10 N protects against earth faults b B: Sepam series 10 B protects against overloads, phase-to-phase faults and earth faults b A: Sepam series 10 A provides the same functions as model B, but with a communication port, more inputs and outputs, and additional protection and monitoring functions.
Simplicity b easy operation - screen, keys, pictograms, etc., good ergonomics b fast set-up - installation, wiring, parameter setting directly on the relay without a PC b easy stock management - a single box, no accessories.
Reliability b guaranteed protection of life and property - high-quality product, compliance with standards, continuous self-test b safety of operating personnel - all accessible parts are made of insulating materials, light and compact product with no sharp edges b environmentally friendly - compliance with the European RoHS directive, low energy consumption, manufacture in factory certified ISO 14001.
Productivity b attractive, cost-effective product - easy to understand, no unnecessary complications, suited to user needs b improved availability of electricity - precise tripping set points and times, logic discrimination, detailed information made spontaneously available to operator following tripping. b reduced maintenance costs - continuous self-tests to extend periods between maintenance.

Functions

Protections

Earth-fault protection

Standard

Sensitive

High sensitivity

Phase-overcurrent protection

Thermal overload protection

Phase-overcurrent and earth fault protection cold load pick-up

Logic discrimination

blocking send

blocking reception

External tripping

Measurements

Earth-fault current

Phase currents

Peak demand currents

Control and supervision

Circuit breaker tripping and lockout

Tripping indication

Trip-circuit supervision

Remote circuit-breaker control

Record of last fault

Record of last five events

Communication

Modbus

IEC 60870-5-103

Inputs/Outputs (number) Earth-fault current inputs

Phase-current inputs

Logic relay outputs

Logic inputs

Communication port

b Function available. v Function availability depends on the Sepam model.

ANSI code 50N/51N 50/51 49RMS 68
86

Sepam series 10 N B A

v

v

v

v

v

v

v

v

b

b

b

b

b

b

b

b

b

b

b

b

b

b

b

b

b

b

b

b

b

b

b

b

b

b

b

b

b

b b

1

1

1

-

2 or 3 3

3

3

7

-

-

4

-

-

1

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Applications

Sepam series 10 applications

Utility network
MV / MV substation

Protection applications
The primary applications for Sepam series 10 are: b protection of secondary distribution networks (MV/MV and MV/LV substations) b protection of buildings supplied with medium voltage (MV), including office buildings, shopping centres, industrial buildings, warehouses, etc. b protection of low-voltage networks by tripping a Masterpact NW circuit breaker not equipped with a Micrologic control unit.
Power system protections

Industrial and commercial networks

MV / LV substation

Customer MV substation

Main HV / MV substation

Main HV / MV substation

Secondary substation

Integration in a remote-control system
To manage MV substations, Sepam protection relays can be connected to Easergy T200I remote-control and monitoring interfaces (RTU) for operation with PowerLogic power-monitoring units and Flair fault detectors. This flexible solution includes a number of functions: b protection of incoming and outgoing circuits b detection of fault currents b switch management b database containing event logs and measurements b backed-up power supply b communication via SCADA b local and remote access via a web server.

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DE53229

Functions Sepam series 10

Protection functions

t Io>
t Ith

Io>> Io

NBA NBA

Earth-fault protection (ANSI 50N-51N)
Earth-fault protection detects overcurrents caused by phase-to-earth faults. It uses measurements of the fundamental component of the earth-fault current.

2 independent set points (Io> and Io>>) b the low set point (Io>) offers definite time (DT) or IDMT settings with various types of standardized curves (IEC, IEEE, RI) and it is possible to enable an IDMT timer hold. b the high set point (Io>>) offers only the definite time (DT) setting. The minimum setting results in instantaneous operation (ANSI 50). Depending on the required level of sensitivity, there are three types of Sepam relays.

Sensitivity Standard

Sensor
3 phase CTs or 1 earth-fault protection CT, with rated primary current Ino

Setting range 0.1...24 Ino

Sensitive (1)

3 phase CTs or 1 earth-fault protection CT, with rated primary current Ino

0.01...2.4 Ino

High sensitivity

Special core balance CSH or GO, with ratio of 470/1

0.2...240 A primary, i.e. 0.0004...0.5 Ino

(1) Setting not available with Sepam series 10N.

Phase-overcurrent protection (ANSI 50-51)
Phase-overcurrent protection detects overcurrents caused by phase-to-phase faults. It uses the measurements of the fundamental component of currents drawn from two or three phase CTs, with a secondary rating of 1 A or 5 A.
2 independent set points (I> and I>>) b the low set point (I>) offers definite time (DT) or IDMT settings with various types of standardized curves (IEC, IEEE, RI) and it is possible to enable an IDMT timer hold. b the high set point (I>>) offers only the definite time (DT) setting. The minimum setting results in instantaneous operation (ANSI 50).

NBA

Thermal image overload protection (ANSI 49 RMS)
This protection function is used to protect cables and HV/LV transformers against overloads, based on measurement of the current drawn.
The function is based on a thermal model witch calculates the temperature rise from current measurements. The current measured is an RMS 3-phase current which takes into account harmonics up to number 13.
Two protection settings b the continuous maximum permissible current setting which corresponds to the maximum thermal withstand of the protected devices (the continuous permissible current corresponds to a temperature rise of 100 %). b the setting for the equipment heating and cooling time constant.

I>

I>>

I

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Functions Sepam series 10

Protection and measurement functions

NBA

Phase-overcurrent and earth-fault protection cold load pick-up
The desensitization function avoids nuisance tripping during energizing operations, particularly following a long outage. It temporarily raises the protection set point.

High currents during energization may be due to: b simultaneous energizing of all loads in an installation (air conditioning, heating, etc.) b magnetizing currents in power transformers (these currents can saturate the phase-current sensors and create a false residual current on the secondary of the sensors) b motor starting currents.

Protection function
Phase-overcurrent protection

Mode of action
After circuit-breaker closing, the tripping set points (I> or I>>) are increased or disabled for the set time.

Earth-fault protection

After circuit-breaker closing, the tripping set points (Io> or Io>>) are increased or disabled for the set time. Or This protection is restrained by sensor saturation detection (H2 measurement) (1)

(1) Setting not available with Sepam series 10 N.

T = 100 ms

NBA

T > 100 ms
Logic discrimination ensures tripping within 100 ms for a fault affecting the substation busbars, while maintaining discrimination with the feeders.
NBA

Logic discrimination (ANSI 68)
This function provides: b perfect tripping discrimination with phase-to-phase and phase-to-earth shortcircuits, on all types of network b faster tripping of the breakers closest to the source. All Sepam series 10 relays (N, B and A) can send a blocking signal when a fault is detected by the phase-overcurrent and earth-fault protection functions. Only the Sepam series 10 A relays can receive blocking signals which inhibit protection tripping. A saving mechanism (exclusive Sepam function) ensures back-up protection in the event of a blocking link failure.
External tripping
A Sepam series 10 A can receive, via a logic input, a tripping order from an external protection device.

NBA

Earth-fault current
This function displays the value of the fundamental of the earth-fault current.
For this measurement and for earth-fault protection (ANSI 50N/51N), the zerosequence input must be connected either to the common point of the three phase CTs or to one earth-fault protection CT or to a CSH120, CSH200 or GO110 core balance CT.

NBA

Phase currents
This function displays the rms phase-current values and takes into account harmonics up to order 13. On Sepam series 10•4••, this function displays the three phase currents. On Sepam series 10•3••, only the A and C phases are connected and displayed.

NBA

Peak demand currents
This function displays the greatest average current on each of the three phases and indicates the current absorbed by peak loads.

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Functions Sepam series 10

Control and monitoring

Trip orders

Closing orders

A 10

9

O2

8

7

6

5

O1

4

3

Closing inhibit (ANSI86)

Shunt trip unit

Closing coil

Circuit-breaker control with a Sepam series 10B or N.

D 18

O4

17

Trip orders

A 10

9

O2

8

7

6

5

O1

4

3

D5

I2

4

2

I1

1

Closing orders
Closing inhibit (ANSI86)

Shunt trip unit

Closing coil

Circuit-breaker control with a Sepam series 10A.

NBA

Circuit breaker tripping and lockout (ANSI 86)
Sepam can be used in all types of circuit-breaker control systems.

Functions of the output relays Relay outputs Standard assignment

O1

Circuit-breaker tripping

O2

Closing inhibited

O3

Tripping indication

NBA

Trip-circuit supervision
This function continuously monitors the trip circuit to make sure that it has not been interrupted. The system shown opposite runs a low current through the trip circuit. Sepam checks that the current is effectively present.

NBA

Remote circuit-breaker control
The circuit breaker can be remotely controlled via the communication system. A Sepam logic input is used to select the operating mode (local or remote).

NBA

Record of last fault
Displays the characteristics of the last fault. Sepam indicates the fault source, the value of the three phase currents and the earth current at the time of tripping and the date and time of the fault. The information is stored in memory until the next fault.
Origin of recorded faults : I>, I>>, Io>, Io>> and thermal overload protection.

NBA

Record of last five events
Displays the characteristics of the last five events. For each event, Sepam indicates the fault source, the value of the three phase currents and the earth current at the time of the event and the date and time of the event. The events are numbered in order of occurrence and the last five are memorized.
Recorded events: b tripping due to I>, I>>, Io>, Io>>, thermal overload protection b tripping via input signal from external device b fault in tripping circuit b circuit-breaker opening and closing initiated by communication b tripping due to I>, I>>, Io> or Io>> (logic discrimination back-up)

NBA

Communication
Sepam series 10 A relays are equipped with an RS485 communication port. The desired protocol (two available) must be set up in the parameters: Modbus, IEC 60870-5-103.
Communication can be used for a number of functions: b reading of measurements b reading of status conditions b reading of time-stamped measurements and events (two tables containing 100
events are available) b time setting and synchronisation b transmission of remote controls

NBA

Operating language
On delivery, the default language is English. The languages that may be selected are UK English, US English, French, German, Italian, Portuguese, Spanish and Turkish.

10

Connection

Operating diagram

N B A Sepam series 10 N

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IA IB IC
CSH120 CSH200 GO110

B 15 25 14 24 13 23

Io

12

2-240 A

22

11 21

Io 0.2-24 A

14 13

O3

12

11

10

9

Io >

S

O2

8 7

I >

R

1S

1

R Io >>

6

5

O1

4

3

2

Reset

1

A

Other connection possibilities depending on the model

A

A

B

B

C

C

15 B 25 14 24 13 23

12

22

Io

11 21

CT 1A/5A

15 B 25 14 24 13 23

12

22

Io

11

21

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Relay outputs
O1 O2 O3

Standard assignment
Circuit breaker tripping Circuit breaker lockout Tripping indication

Customization via parameter settings YES
YES
YES

11

Connection

Operating diagram

N B A Sepam series 10 B

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IA IB IC

15 B IA

25

max

14

IB

24

13

IC

23

I > 1
I >>

49 RMS

I >
S R

14 13

O3

12

11

10

9

S

O2

8

R

7

A

Io

12

2-240 A

22

11

21 Io 0.2-24 A

S

1

R

Io >

I >

1

S

R

Io >>

6

5

O1

4

3

2

1

Reset

A B C
CT 1A/5A

Other connection possibilities depending on the model
A B C

15 B

25

IA

14

24

IB

13

23

IC

12

22

Io

11 21

CSH120 CSH200 GO110

15 B 25 14 24 13 23
12 22 11 21

IA max
IC Io 2-240 A Io 2-240 A

Relay outputs
O1 O2 O3

Standard assignment
Circuit breaker tripping Circuit breaker lockout Tripping indication

Customization via parameter settings YES
YES
YES

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12

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Introduction Sepam protection relays, the product of experience