DMVT100Portable Dynamic Contact Resistance Meter

Enhanced Quality Assurance

SpecificationsDMVT100

DMVT100

Software Features

Test leads set for:

Ÿ Connection between DMVT100 to Breaker / GIS – 15 meterŸ Connection between DMVT100 to AutoScan/CBScan - 5 meter

Resistance range 8000µ , 4000 µ , 2000 µ full-scale

Resolution 32, 16, 8 micro ohm

Accuracy Value ± 2 % ± Resolution

Current 100 A DC full-scale, for up to 1 sec

Output 0 to 5 V DC compatible with AutoScan/CBScan series of analyzers

Software DMVT100 software for on screen analysis of test results

Power 230 V AC ± 5%, 50 Hz ± 10%

The Dynamic Millivolt Drop Tester (DMVT100) is an accessory, used with AutoScan/CBScan series of

circuit breaker test systems. DMVT is used to measure the dynamic contact resistance and plot a

dynamic contact resistance curve (DCRM signature) against time, which helps to monitor the

condition of the contacts without opening the interrupter. A test current of 100A DC is injected into the

contact and the dynamic value of the circuit breaker contact resistance is measured, when the

Breaker is performing a C-O operation. DMVT100 is used essentially to test the MV and EHV Circuit

Breakers with insertion type of contacts.

Measurements

Ÿ Quick performance check of circuit breaker by measuring the dynamic behavior of contacts.

Ÿ Correlation of DCRM with travel characteristic using customized travel transducers and fixtures

Ÿ Recording of DCRM signature of a single interrupter at a time

Ÿ Independent, isolated, inbuilt 100 A DC source

for single interrupter.

Ÿ When DCRM signature is correlated with travel curve, the health of main and arcing contacts can be ascertained and wear and tear of arcing contacts can be estimated

Ÿ Health of the damping mechanism is also monitored

Features

Ÿ 100 A DC current injection through battery with inbuilt charger

Ÿ Recording of DCRM signature of a contact by four-wire method which ensures high accuracy and repeatability

Ÿ Quick performance check of circuit breaker by taking a C-O operation on the breaker with time resolution in micro-seconds and selectable delay between multiple operations

Ÿ Supplied with test lead set suitable for EHV circuit breakers having quick-fit connectors

Ÿ Housed in a robust carrying case that can be connected to an existing AutoScan/CBScan series of circuit breaker test systems

Ÿ Easy-to-use, high level graphical user interface and programmable test plans help to create a test setup library

Ÿ Dynamic calculations with cursor movement to help in on-screen analysis

Ÿ Automatic creation of folder structure for storage of test data

Ÿ Crest Technology also provides an upgrade for existing Windows-based AutoScan/CBScan test software of earlier versions, to allow analysis of DCRM signatures

Portable Dynamic Contact Resistance Meter

Product specifications subject to change

SpecificationsDMVT100

DMVT100

Software Features

Test leads set for:

Ÿ Connection between DMVT100 to Breaker / GIS – 15 meterŸ Connection between DMVT100 to AutoScan/CBScan - 5 meter

Resistance range 8000µ , 4000 µ , 2000 µ full-scale

Resolution 32, 16, 8 micro ohm

Accuracy Value ± 2 % ± Resolution

Current 100 A DC full-scale, for up to 1 sec

Output 0 to 5 V DC compatible with AutoScan/CBScan series of analyzers

Software DMVT100 software for on screen analysis of test results

Power 230 V AC ± 5%, 50 Hz ± 10%

The Dynamic Millivolt Drop Tester (DMVT100) is an accessory, used with AutoScan/CBScan series of

circuit breaker test systems. DMVT is used to measure the dynamic contact resistance and plot a

dynamic contact resistance curve (DCRM signature) against time, which helps to monitor the

condition of the contacts without opening the interrupter. A test current of 100A DC is injected into the

contact and the dynamic value of the circuit breaker contact resistance is measured, when the

Breaker is performing a C-O operation. DMVT100 is used essentially to test the MV and EHV Circuit

Breakers with insertion type of contacts.

Measurements

Ÿ Quick performance check of circuit breaker by measuring the dynamic behavior of contacts.

Ÿ Correlation of DCRM with travel characteristic using customized travel transducers and fixtures

Ÿ Recording of DCRM signature of a single interrupter at a time

Ÿ Independent, isolated, inbuilt 100 A DC source

for single interrupter.

Ÿ When DCRM signature is correlated with travel curve, the health of main and arcing contacts can be ascertained and wear and tear of arcing contacts can be estimated

Ÿ Health of the damping mechanism is also monitored

Features

Ÿ 100 A DC current injection through battery with inbuilt charger

Ÿ Recording of DCRM signature of a contact by four-wire method which ensures high accuracy and repeatability

Ÿ Quick performance check of circuit breaker by taking a C-O operation on the breaker with time resolution in micro-seconds and selectable delay between multiple operations

Ÿ Supplied with test lead set suitable for EHV circuit breakers having quick-fit connectors

Ÿ Housed in a robust carrying case that can be connected to an existing AutoScan/CBScan series of circuit breaker test systems

Ÿ Easy-to-use, high level graphical user interface and programmable test plans help to create a test setup library

Ÿ Dynamic calculations with cursor movement to help in on-screen analysis

Ÿ Automatic creation of folder structure for storage of test data

Ÿ Crest Technology also provides an upgrade for existing Windows-based AutoScan/CBScan test software of earlier versions, to allow analysis of DCRM signatures

Portable Dynamic Contact Resistance Meter

Product specifications subject to change

25/5A/1/2, Nanded Phata, Sinhagad Road, Pune 411 041 +91 20 32419696 | www.crestech.co.in | info@crestech.co.in

Crest Test Systems Pvt. Ltd.

Our customer base

Crest Test Systems is a pioneering company in the field of Test & Measurement. The Crest core team has an experience of 30 years in the field of Switchgear Testing. Our test systems are used everyday to test switchgear on the shop-floors of all leading switchgear manufacturers and also in government test and certification labs. Apart from the Power Sector, Crest also designs and manufactures customized test systems for Metros & Railways, Motor Manufacturing, Battery Industry, and Test & Certification Labs.