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TESTING OF ISOLATORS AND
CIRCUIT BREAKERS
Contents
•Introduction
•Testing of isolators
•Testing of CB
•Synthetic test of CB and isolator
•Conclusion and Reference
Prepared by S.ARUN M.Tech Testing of isolators and CB
Introduction
• Isolator – mechanical switching device which
provides in the open position
• Capable of carrying current under normal circuit
conditions
• CB- routine switching and for protection of other
equipment
• Preventive maintenance
2Prepared by S.ARUN M.Tech Testing of isolators and CB
Testing of isolators
Dielectric tests
Overvoltage withstand test of power frequency, lightning
and switching impulse voltages.
The impulse test
Impulse test and switching surge tests with switching over
voltage are done.
Temperature and mechanical tests
These tests are done in CB. Which use to be conduct
withstand capability of isolators.
Prepared by S.ARUN M.Tech Testing of isolators and CB 3
Testing of CB
Short circuit tests
(a) Direct tests
(b) Using a short circuit generator as the source
Prepared by S.ARUN M.Tech Testing of isolators and CB 4
(a) Direct testing
This is done during period of limited energy
consumption or when the electrical energy is
diverted to other sections of the network which
are not connected to the circuit under the test.
( b) Using a short circuit generator as the source
A make switch initiates the short circuit and
the master C.B isolates the test device from the
source at the end of predetermine time set on a
test controller.
5Prepared by S.ARUN M.Tech Testing of isolators and CB
SYNTHETIC TESTS
ON CIRCUIT BREAKER AND ISOLATOR
(a) Synthetic Testing of Circuit Breakers
In the initial period of the short circuit test,a.c
current source supplies the heavy current at a
low voltage, and recovery voltage is simulated
by a source of high voltage of small current
capacity.
(b) Composite Testing
The C.B is tested first for its rated breaking
capacity at a reduced voltage and afterwards for
rated voltage at a low current.
6Prepared by S.ARUN M.Tech Testing of isolators and CB
( c ) Unit Testing
When large C.B of very high voltage rating
(220 kV and above) are to be tested and
where more than one break is provided per
pole, the breaker is tested for one break at its
rated current and the estimated voltage.
7Prepared by S.ARUN M.Tech Testing of isolators and CB
( d ) Testing Procedure
The C.B are tested for their breaking capacity B and making
capacity Mand it is tested for following duty cycle
(1) B-3-B-3-B at 10%of the rated symmetrical breaking
capacity
(2) B-3-B-3-B at 30%of the rated symmetrical breaking
capacity
(3) B-3-B-3-B at 60%of the rated symmetrical breaking
capacity
(4) B-3-MB-3MB-MB0 at 10%of breaking capacity with
the recovery voltage not less 95% of the rated service
voltage
8Prepared by S.ARUN M.Tech Testing of isolators and CB
(e) Asymmetrical Tests
One test cycle is repeated for the
asymmetrical breaking capacity in which the
d.c component at the instant of contact
separation is not less than 50% of the a.c
component
9Prepared by S.ARUN M.Tech Testing of isolators and CB
• Conclusion
From this we came to know about the
varies types of testing procedure incorporated
in circuit breaker and isolators.
• Reference
“High voltage engineering ” by M S Naidu and
V Kamaraju, Tata McGraw Hill Education, 5th
edition.
Prepared by S.ARUN M.Tech Testing of isolators and CB 10

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Circuit breaker

  • 1. TESTING OF ISOLATORS AND CIRCUIT BREAKERS Contents •Introduction •Testing of isolators •Testing of CB •Synthetic test of CB and isolator •Conclusion and Reference Prepared by S.ARUN M.Tech Testing of isolators and CB
  • 2. Introduction • Isolator – mechanical switching device which provides in the open position • Capable of carrying current under normal circuit conditions • CB- routine switching and for protection of other equipment • Preventive maintenance 2Prepared by S.ARUN M.Tech Testing of isolators and CB
  • 3. Testing of isolators Dielectric tests Overvoltage withstand test of power frequency, lightning and switching impulse voltages. The impulse test Impulse test and switching surge tests with switching over voltage are done. Temperature and mechanical tests These tests are done in CB. Which use to be conduct withstand capability of isolators. Prepared by S.ARUN M.Tech Testing of isolators and CB 3
  • 4. Testing of CB Short circuit tests (a) Direct tests (b) Using a short circuit generator as the source Prepared by S.ARUN M.Tech Testing of isolators and CB 4
  • 5. (a) Direct testing This is done during period of limited energy consumption or when the electrical energy is diverted to other sections of the network which are not connected to the circuit under the test. ( b) Using a short circuit generator as the source A make switch initiates the short circuit and the master C.B isolates the test device from the source at the end of predetermine time set on a test controller. 5Prepared by S.ARUN M.Tech Testing of isolators and CB
  • 6. SYNTHETIC TESTS ON CIRCUIT BREAKER AND ISOLATOR (a) Synthetic Testing of Circuit Breakers In the initial period of the short circuit test,a.c current source supplies the heavy current at a low voltage, and recovery voltage is simulated by a source of high voltage of small current capacity. (b) Composite Testing The C.B is tested first for its rated breaking capacity at a reduced voltage and afterwards for rated voltage at a low current. 6Prepared by S.ARUN M.Tech Testing of isolators and CB
  • 7. ( c ) Unit Testing When large C.B of very high voltage rating (220 kV and above) are to be tested and where more than one break is provided per pole, the breaker is tested for one break at its rated current and the estimated voltage. 7Prepared by S.ARUN M.Tech Testing of isolators and CB
  • 8. ( d ) Testing Procedure The C.B are tested for their breaking capacity B and making capacity Mand it is tested for following duty cycle (1) B-3-B-3-B at 10%of the rated symmetrical breaking capacity (2) B-3-B-3-B at 30%of the rated symmetrical breaking capacity (3) B-3-B-3-B at 60%of the rated symmetrical breaking capacity (4) B-3-MB-3MB-MB0 at 10%of breaking capacity with the recovery voltage not less 95% of the rated service voltage 8Prepared by S.ARUN M.Tech Testing of isolators and CB
  • 9. (e) Asymmetrical Tests One test cycle is repeated for the asymmetrical breaking capacity in which the d.c component at the instant of contact separation is not less than 50% of the a.c component 9Prepared by S.ARUN M.Tech Testing of isolators and CB
  • 10. • Conclusion From this we came to know about the varies types of testing procedure incorporated in circuit breaker and isolators. • Reference “High voltage engineering ” by M S Naidu and V Kamaraju, Tata McGraw Hill Education, 5th edition. Prepared by S.ARUN M.Tech Testing of isolators and CB 10