gis cb time testing

8/3/2019 GIS CB time testing

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Time measurement instrumentBreaker Analyzer system TM-1600

Noida, 18th July 2008

Vishal TelangEngineer GIS


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Presented by Vishal Telang3 3

TM-1600


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Definition of Circuit Breaker Timing

The timing of a breaker is the time measurement of themechanical operations in order to verify its integrity andgood working order.

Mechanical operation means all operation or cycle ofoperation the breaker is intended to do without beingconnected to the power grid.


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Importance, Need of Test

Why it is necessary to know CB operating time ?

Operating timings are monitored to indicate any problems in operatingmechanisms, alignments of main/arcing contacts and also differencebetween two breaks of the same breaker pole. If these timings are not withinorder, it may lead to over stressing of one particular interrupting chamber.

It is a necessary to time each breaker, in order to have its functional

signature. Incorrect operation can have unfortunate consequences on theequipment or the substation personnel. Also, the out of service losses ofrevenue and the repair costs.

Timing tests are done first in the factory during the routine tests and afterinstallation, during the commissioning tests.

They have to be done periodically in order to validate the good working orderand reliability of the breaker.

Timing tests are also a powerful tool for troubleshooting faulty breakers.


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Description

In order to measure the operation times of a breaker, we need a devicecapable of detecting the instant of contacts state changing starting from thepoint the order was launched.

This device sends electric signals via cables connected to each contact, inthe case of several contacts in series each signal has its own source toeliminate interference.

The signal has two possible states. The first is when the contact is closed,the second when the contact is open. All is recorded for consultation andanalysis.

These special devices are called timing machines or circuit breakeranalyzers. They are designed to generate all the needed signals andincorporate a data acquisition system.


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Timing CB TM 1600

The time measurement instrument TM-1600 is amulti-channel ( 4,8,12 or 16) microcomputer basedevent recorder which, used for timing high voltagecircuit breakers.



TM-1600 controls, indicators and terminals




1. Earth (ground) Connection.It is very essential to ground body of TM-1600 instrument with substation earth mesh on given point.

2. PARKING TERMINALS.Safety terminals for breaker control wires. Not connected to internal circuits. Also to avoidunintentional breaker operation while working on the breaker, the breaker control circuit mustdisconnect from TM-1600 outputs.

3.Power ON/OFF.

4.POWER-ON lamp.

Flashing = Low battery..

ON OFF
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5. Breaker control outputs.

These output port are used for interfacing closing coil & trippingcoil of breaker with time machine. By making this connection wecan operate breaker for making & breaking operation locally viaTM-1600 or by closing the REMOTE START input terminal.

Also Power for operating time machine supplied through these

point.
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6. Breaker operation SEQUENCE selector switch.

Their are two main operations on breaker is Close & Trip.In most of the cases it has to execute on demand a combination ofthe basic operations, called cycles.The most popular are the following:

1. Trip Free, (C-O): simulates a trip on short circuit after a CLOSE.

The breaker must open instantly.

2. Reclose, (O-C): Simulates a fast close after short circuit trip toreestablish the current.

3. Reclose-open, (O-0.3s-C-O): Simulates a RECLOSE on shortcircuit. The breaker should clear the fault successfully.

4. (C-O)-15 sec-(C-O)-15-sec-(C-O) : Simulates a multiple close aftershort circuit trips in purpose of reestablishing the current, hopingthat the short circuit is disappeared. This cycle is mostly used in theMedium voltage applications.
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7.START of breaker operation and recording switch.

Recording starts only if the Ready lamp is on, the breaker is operatedwithout measurement.
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8. CLOSE DELAY.Closing pulse delay setting.

Pulse delay is measured from the start of the previous pulse. 10 ms resolution

9. OPEN DELAY. Trip pulse delay setting.

Pulse delay is measured from the start of the previous pulse. 10 ms resolution.
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10. Timing channel input terminals.

From these terminals we made connection between CB Main contact& TM-1600.

These channel also known as verification circuit .Each verificationcircuit includes a voltage source that injects current oncontact making; a detection circuit, to detect the currentand determine if the contact is closed.
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11. Timing channel mode switch.

There are three different mode which can toggle by given toggle switch.

1.Resistance mode: When putting toggle s/w in left hand side.

This mode is applicable when PIR present in CB circuit.

Ex. PIR Contact in CB
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2.Contact Mode(Normal position)

This mode is generally used as measure operating time ofCB.Toggle switch is in normal position.

Ex. Main contact of isolated CB,Indicating or control s/w

contact of CB.

See s/w position

TM 1600 t l i di t d t i l




3. Voltage Mode.

In this mode, position of toggle s/w is in right hand side.

This mode is used when contact using for measuring operatingtime is already charged by external source.

Ex. Charged closing & Tripping coil




12. READY for measuring button.

1st touch: Prepares for normal recording.2nd touch: Provides long-term monitoring (optional).

13.READY lamp.

Steady light: Ready for normal recording.Slow flash: Ready for long term monitoring (optional).Fast flash: Measurement in progress.

14.PRINT MODE.

Report format selector switch.

1. Table of events in channel-number order.Graph of events,compressed time scale.2. Table of events in channel-number order.

3. Table of events in chronological order.

4. Graph of events,linear time scale.

5. Optional.

6. Static state of timing channel input.

7. MA-31.Breaker summary+test diagram. Built in Printer.

8. MA-31.Breaker summary+test diagram. External Printer.

15.Printer START/STOP and PAPER FEED button.

Paper feed if pressed longer than 1 s.
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16.REMOTE START input.

External short-circuit provides a me result as turning the start switch .

17.TRIG OUT.

Output for synchronous start of other equipment.

Short-circuits the terminals at instant of triggering. Used when several TM1600s are

used together.

18.TRIG.

Input for external start of recording. Recording starts if the READY lamp is on.

19.Motion Analyzer MA61.

20. Fuses for breaker control outputs.
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Precaution before starting test

PRECUATIONa) Ensure that SFT/PTW is taken as per norms.

b) There should not be any joints in testing cables.

c) Test leads should not touch any live part.

d) Never connect the test set to energized equipment.

e) The ground cable must be connected first and removed at last.

f) High voltage plugs should be free from moisture during installation and

operation.

g) Circuit Breaker Analyzer body should be earthed ( if separate earth is provided).

h) It should be ensured that whole testing equipment along with testing procedures areavailable at testing site. Testing must be carried out in presence of testing personnelonly.

i) Surface/terminals should be cleaned where the connections for testing are to be made.

j) Clean earth point with sand paper/wire brush where earth terminal is to be

provided.

k) Ensure that all the poles trip simultaneously through single close/trip command.



Procedure of test

1.Check that :The poles or the cubicles are correctly secured to the ground.

The electrical connections between the circuit breaker and control cubicle are made inaccordance with the electric circuit diagrams.

When the measurements are performed on energised substation, disconnect thealarms or commands can be transmitted to the control.

2. Wire up the time recorder according to FIG.

3.Energise the time recorder after having checked that it is properly connected to earth.4. Adjust the time delays of the switching operations, no time delay is necessary for theoperations C, O and CO. For the switching cycle O-(t)-CO, delay the C with the value(t) specified in the Inspection Results File (contractual cycle).

For example : t = 0.3 s (300ms) normally

5.Perform the switching cycle desired.

6.Place the print selector onto program 1.

7.Press the READY button, the red lamp lights up, turn the START knob before thelamp goes out.

8.The report will be automatically issued after the switching operation.
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Analysis of test report

Analysis of the time recorder report

Time of the circuit breaker contacts on closure = Time when the pole comesinto contact - time of appearance of the voltage at the terminals of themaking coil.

Time of the circuit breaker contacts on opening = Time of the pole contactscoming out - time of appearance of the voltage at the terminals of thetripping coil.

Short-circuit time = Time of the pole contacts coming out - time of entry intothe contacts.

Time of the auxiliary contacts type a or type b on closure = Time for the Csa or b switching over on closure - time of appearance of the voltage at theterminals of the making coil.

Time of the auxiliary contacts type a or type b on opening = Time for theCs a or b switching over on opening - time of appearance of the voltage atthe terminals of the tripping coil.

Report Form

A
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Accessory

A


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Accessory


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Thanking You


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gis cb time testing

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