tutorial 7 specifying relay testing requirements

Specifying relay testing requirements

Uttam Mishra

Doble Engineering Company

Title 2

Outline Philosophy of testing What Features should good test equipment have? What offering Doble has to meet this requirement? Competitive Offerings What makes the Doble offering the best? Conclusions Q/A

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You can't do today's job with yesterdays methods and be in business tomorrow

Testing Philosophy

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Evolution of Testing

Electromechanical & Static Relay Testing Techniques Steady state test Dynamic on/off test

For EMS technologies, the testing philosophy was based upon proving the integrity of the relays operating characteristic and operating time for each fault type against the manufacturers specification.

This philosophy was verified or updated according to results from acceptance testing / commissioning or in-service failures.

Electromechanical relays operated based on mechanics and magnetism so require much power for testing.

It also require high compliance voltage for testing due to resistance of coil


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Evolution of Testing

Numerical Relays and PMU testing Dynamic testing Transient testing End to end testing Wide Area Measurements

Numerical relays are multifunctional. when testing a microprocessor relay element with conventional technique, different elements inside the relay often overlapped and we do not get expected results.

Numerical relays and PMU are microprocessor based devices so require very less power compare to Electromechanical relay for testing.

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Desired Testing instrument Requirements Relay test kit which can test old generation relays to modern microprocessor

based relays Electromechanical relays Electrostatic relays Numerical relays PMUs Energy meters and transducers

Flexible Configurations 4 voltages + 4 currents minimum 6 currents for differential schemes

Enough Power to Test the Scheme High Power is required across all test currents

Can only be achieved by switchable ranges Reliable & Guaranteed Output Waveforms Designed for Field Operation Technical Support


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Technical offerings

Voltage Generator 6 voltage sources User can select any nos of voltage out of 6 voltages Multiple ranges 75/150/300 V automatically selected by software Can be used for end to end testing of Main I & Main II protection Can be converted to low level current signals for testing high

burden electromechanical relays Convertible voltage sources can offer compliance voltage as high

as 300V. These are suitable for testing old generation electro-mechanical over current and earth fault protection relays most efficiently and authentically.

Selective current resolution up to 100uA in convertible sources.

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Current Generator

6 current sources Multiple Current range 8.75/17.5/35A Constant compliance voltage for a selected current range. Enhanced rating having highest current capability in one

instrument. All sources can be parallel for higher output


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F6000: Power Output vs. Current

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Compliance Voltage = 20 Volts

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17.5 A Range: 175 VA


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35 A Range: 175 VA

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Doble Benefits

Single box solution for complete scheme testing No need to get confused about selecting suitable model for

your versatile needs. Modular design which saves repairing time and cost. Output of amplifiers are independent of input supply

variations due to back to back amplifier design. Easy to upgrade design. The interfaces like IEC61850,

Meters and transducer or GPS etc. can be activated by just upgrading the firmware. The users can do it independently.

Flexible Software to test your way


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Continue.

All specifications are for worst case operating condition Source ratings independent of power factor of load Source ratings independent of dynamic changes in load

characteristics Sources independent of each other Sources have AC/DC output Rugged Design intended for field use Most power in a single instrument Repair and Calibration available in the region 12 sources simultaneously

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Common Queries from Customer

Burden Capacity: More than 400VA Compliance Voltage Voltage Generator: 4X 300V Self Calibration Design & Size


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Doble Solutions

Burden Capacity & Compliance Voltage: High burden capacity and compliance voltage needed for testing

of electromechanical relay at low plug setting. Doble Power System Simulator has two current generator option

Right bank current generators which is able to test all numerical, static and low impedance electro-mechanical relay.

Left bank V/I generators which is able to supply high compliance voltage and low level current for high impedance electro-mechanical relay testing.

Compliance voltage up to 300 V can be supplied by F6150 which is highest in available instruments.

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Current XX Instrument Doble Power Simulator

Output power

Compliance voltage

Output power

Compliance voltage

0.2 A 6.8 VA 34 V 60 VA 300V

0.4 A 13.6 VA 34V 120 VA 300 V

0.6 A 20.4 VA 34V 90 VA 150 V

0.8A 27.2 VA 34V 120 VA 150 V

1.0 A 34 VA 34V 150 VA 150 V

Suppose VA per phase of XX instrument is 1000VA and highest current is 30 A.

compliance voltage= VA Capacity/ Max Current = 1000 VA/ 30 A= 33.33 VOut put power at 0.2 A = compliance voltage X current= 33.33 X 0.2= 6.66 VA

Competitive Analysis


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125 VA

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Voltage Source: 4X 300 V at 85 VA Doble offers 6 X 150 V at 75 VA or 3X300V at 150VA Standard PT Secondary L-N voltage is 63.5V So 150 V is approx 240 % of standard PT voltage which is

sufficient for all relay testing requirements Generally 3 voltage sources used for testing if only 3 voltage sources are used then output power is 150VA of

each source which is highest in available instruments. 6 voltage sources used for simultaneously Main I and Main II

protection scheme in end to end testing


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Self Caliberation: The philosophy of calibration needs an external standard

reference so the need of self calibration does not apply. Doble F6150SV provides inbuilt checks that inform if there is any

internal measurement error. Doble provides F6080 as an additional hardware option for

calibration verification. It is recommended to utilize services from the Doble service

center that has calibration facility. Size and Design:

Size is slightly big due to Modular design but it reduces repairing cost and time Back amplifier design

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New Products

F6150 SV Power System Simulator Enhanced power model of F6150 Compliant to IEC 61850 Station bus and Process bus testing Compliant for PMU Testing Can operated through WiFi, USB and Ethernet communication Highest current capacity in single instrument


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Provide reliable time synchronization from existing Station Satellite clock sources

F6051 IRIG-B to GPS Converter

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The F6051 converts modulated or demodulated IRIG-B signals to GPS,

allowing you to have synchronized signals for the F6150.



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For interior use If you are unable to run a satellite antenna cable outside because

doors and window cannot be opened for prolong periods End-to-end testing

Ideal for end-to-end testing in locations where an IRIG-B source is available

Phasor measurement units Useful for testing of PMUs per IEEE standard C37.118

IEC61850 compliant testing Capable of IEC compliant testing where time stamped

requirements are a must for Goose and Sampled Values message monitoring and evaluation.


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F6Test 3.10.2 Compliant for Sampled value ( IEC 61850 Process Bus Testing) Support for enhanced current amplifier ranges with F6150sv

instruments Additional relay models have been added to the impedance relay

and differential relay library. full Windows 7 compatibility

Protection Suite 2.1 One software for complete Steady state, Transient and Dynamic

Testing of relays Compliant for PMU Testing Compliant for meter and transducer Interface

New Softwares


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Protection Test Instruments Sold in more than 110countries Worldwide

Why? Quality Support Conferences & Applications Creating equipment that meets requirements & exceed

expectations Reputation The Industry Standard Continuous improvement with change in technology Leader in diagnostic test instruments

Why Doble Engineering?

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Doble Support

DSA Membership Upto 1960 Doble conference online data access Conference and user group meetings Ask doble for solution of technical queries from Doble experts Doble instrument class room training at training center, Vadodara Training at client location

Repairing and calibration at repairing center at Vadodara Support on email and phone for technical and instrument

operating problems.

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Continuous Improvement

We are ALWAYS working to IMPROVE

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Thank-you for Listening


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tutorial 7 specifying relay testing requirements

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