27
Electrical Distribution Training Training for Sepam Series 20/40/80 Control and monitoring functions

Electrical Distribution Training

  • Upload
    kalona

  • View
    110

  • Download
    5

Embed Size (px)

DESCRIPTION

Electrical Distribution Training. Training for Sepam Series 20/40/80 Control and monitoring functions. Presentation. Sepam series 20/4080 perform the basic control and monitoring functions required for electrical network operation and also reduces the need for auxiliary relays. - PowerPoint PPT Presentation

Citation preview

Page 1: Electrical Distribution Training

Electrical Distribution Training

Training for Sepam Series 20/40/80

Control and monitoringfunctions

Page 2: Electrical Distribution Training

2

Presentation

Sepam series 20/4080 perform the basic control and monitoring functions required for electrical network operation and also reduces the need for auxiliary relays.

Each Sepam includes the appropriate control and monitoring functions for the chosen application. In order for functions to be used, exclusive parameter setting and special wiring of the inputs and outputs are required.

For easier commissioning, the functions have default settings that may be used for the most frequent applications.

Page 3: Electrical Distribution Training

3

Switchgear control

This logic function handles all the circuit breaker closing and tripping conditions based on:

breaking device status data remote control orders protection functions specific control logic scheme for each application

(e.g. recloser, load shedding)

In order for this function to operate, the Sepam series 80 must have the necessary logic inputs (an MES 120 module is required).

Page 4: Electrical Distribution Training

4

Switchgear control

Page 5: Electrical Distribution Training

5

Switchgear controldetail of ANSI 25 control

Page 6: Electrical Distribution Training

6

Switchgear control

Circuit breaker or contactor with tripping coil (parameter: circuit breaker)

Page 7: Electrical Distribution Training

7

Switchgear control

Simple contactor (parameter: contactor)

Page 8: Electrical Distribution Training

8

Latching / acknowledgment

The functions that inititate tripping may be latched individually when they are set up and may be reset according to different modes.

Page 9: Electrical Distribution Training

9

TC / switchgear position discrepancy

This function detects discrepancies between the last remote control order received and the actual position of the circuit breaker or contactor.

Page 10: Electrical Distribution Training

10

Disturbance recording trigger

Page 11: Electrical Distribution Training

11

Switching of groups of settings

There are two groups of settings, group A / group B, for the phase overcurrent, earth fault, directional phase overcurrent and directional earth fault protection functions.

By switching from one group of settings to another, the protection characteristics may be adapted to suit the electrical environment of the application (change of earthing system, changeover to local power generation …).

Page 12: Electrical Distribution Training

12

Logic discrimination

This function considerably reduces the tripping time of the circuit breakers closest to the source and may be used in closed ring networks.

Time-based discrimination

It applies to the the phase overcurrent 50/51, directional phase overcurrent 67, earth fault 50N/51N and directional earth fault 67N protection functions (definite time and IDMT).

Logic discrimination

Blocking order

Page 13: Electrical Distribution Training

13

Blocking signals are sent during the time required to clear the fault.

If the Sepam gives a tripping order, the blocking signals are interrupted after a time delay that takes into account the breaking device operating time and the protection relay reset time. This system guarantees safety in downgraded operating situations (faulty wiring or switchgear).

Logic discrimination

Pilot wire test The pilot wires may be tested using the output relay test

function in the SFT2841 software.

Page 14: Electrical Distribution Training

14

Logic discriminationThreshold assignment

Threshold assignment for S80, S81 and T81 applications

Threshold assignment for M81, M87 and M88 applications

Threshold assignment for S82, T82, T87, G82, G87, G88 applications

No reception because last link in chain.

1 reception and 1 send (radial network)

2 receptions and 2 sends (ring network, 2 parallel incomers, etc.)

Page 15: Electrical Distribution Training

15

Logic discrimination / 1 reception and 1 send

Page 16: Electrical Distribution Training

16

Logic discrimination / radial network

+--

1A 1kA inst

1A 1kA 0.2s

1B 1kA 0.5s

1A 1kA 0.2sDownstream Sepam

Upstream Sepam

0

0

0

0

01

0

00

0

0

0

No fault / initial phase

Page 17: Electrical Distribution Training

17

+--

1A 1kA inst

1A 1kA 0.2s

1B 1kA 0.5s

1A 1kA 0.2sDownstream Sepam

Upstream Sepam

0

1

1

0

11

1

00

0

0

0

Appearance of fault

Blocking signal

Case 1

Logic discrimination / radial network

Page 18: Electrical Distribution Training

18

Blocking signal during opening

+--

1A 1kA inst

1A 1kA 0.2s

1B 1kA 0.5s

1A 1kA 0.2sDownstream Sepam

Upstream Sepam

1

1

1

1

11

1

01

0

0

0

Tripping order

TRIP

Case 1

Logic discrimination / radial network

Page 19: Electrical Distribution Training

19

+--

1A 1kA inst

1A 1kA 0.2s

1B 1kA 0.5s

1A 1kA 0.2sDownstream Sepam

Upstream Sepam

0

1

1

0

11

1

00

0

0

0

Appearance of fault

Blocking signal

Case 2

Logic discrimination / radial network

Page 20: Electrical Distribution Training

20

Blocking signal during opening

+--

1A 1kA inst

1A 1kA 0.2s

1B 1kA 0.5s

1A 1kA 0.2sDownstream Sepam

Upstream Sepam

1

1

1

1

11

1

01

0

0

0

Tripping order but problem during opening

TRIP

Case 2

Logic discrimination / radial network

Page 21: Electrical Distribution Training

21

+--

1A 1kA inst

1A 1kA 0.2s

1B 1kA 0.5s

1A 1kA 0.2sDownstream Sepam

Upstream Sepam

1

1

1

1

00

0

11

0

0

1

Blocking signal inhibition and upstream opening

Case 2

TRIP

TRIP

Logic discrimination / radial network

Page 22: Electrical Distribution Training

22

+--

1A 1kA inst

1A 1kA 0.2s

1B 1kA 0.5s

1A 1kA 0.2sDownstream Sepam

Upstream Sepam

0

1

1

0

11

1

00

0

0

0

Appearance of fault

Blocking signal

Case 3

Logic discrimination / radial network

Page 23: Electrical Distribution Training

23

Blocking signal during opening

+--

1A 1kA inst

1A 1kA 0.2s

1B 1kA 0.5s

1A 1kA 0.2sDownstream Sepam

Upstream Sepam

1

1

1

1

11

1

01

0

0

0

Tripping order but problem during opening

TRIP

Case 3

Logic discrimination / radial network

Page 24: Electrical Distribution Training

24

+--

1A 1kA inst

1A 1kA 0.2s

1B 1kA 0.5s

1A 1kA 0.2sDownstream Sepam

Upstream Sepam

1

1

1

1

11

1

01

0

0

0

Inhibition problem

Case 3

TRIP

Logic discrimination / radial network

Page 25: Electrical Distribution Training

25

+--

1A 1kA inst

1A 1kA 0.2s

1B 1kA 0.5s

1A 1kA 0.2sDownstream Sepam

Upstream Sepam

1

1

1

1

11

1

01

1

1

1

Backup threshold order

Case 3

TRIP

TRIP

Logic discrimination / radial network

Page 26: Electrical Distribution Training

26

Logic discrimination / closed ring networks

Closed ring networks may be protected by Sepam S82 or T82, which include the following functions:

directional phase (67) and earth fault (67N) protection, with 2 units of each:

– one unit to detect faults in the "line" direction

– one unit to detect faults in the "busbar" direction

use of 2 discrimination types:

– receipt of 2 blocking signals, to block the direction protection functions according to the detection direction

– Sending of 2 blocking signals, according to the detected fault direction

Page 27: Electrical Distribution Training

27

Logic discrimination / closed ring networks

With the combination of directional protection functions and logic discrimination, the faulty section may be isolated with a minimal delay by tripping of the circuit breakers on either side of the fault.

Blocking signals are initiated by both protection functions 67 and 67N. Priority is given to 67: when 67 and 67N detect faults in opposite directions at the same time, the blocking signal sent is determined by the direction of the fault detected by protection 67.

The instantaneous output of protection function 67, activated at 80% of the Is threshold, is used to send blocking signals. This avoids uncertainty when the fault current is close to the Is threshold.