Section II Technical Specifications Tender enquiry no. : STDS/12-1/2016-17/PUR/STL/A-1849 Name of the equipment : SPECIFICATIONS OF SYSTEM FOR CONDUCTING DETERMINATION OF ERRORS TEST ON INSTRUMENT TRANSFORMERS Scope: Design, Supply and Commissioning of Accuracy Measuring System of Instrument Transformers (Current Transformers, Inductive Voltage Transformers and Capacitor Voltage Transformers) as per IEC: 61869-1,2,3&5 consisting of the following: 1) Automatic Instrument Transformer Test Set 2) Current Comparator (Standard Current Transformer) 3) Standard Electronic Voltage Divider 4) Current Burden(programmable) 5) Voltage Burden (programmable) 6) Installation and commissioning of the above equipment at STDS, CPRI, Bhopal Note: The Offers should be submitted only in this format otherwise the offer will be liable for rejection.a detailed technical catalogue /literature/pamphlet and any other technical details shall be sent in hard copy in a sealed cover super scribing enquiry number and due date so as to reach the following address within the due date and time. This is very much essential to evaluate your offer. The item to be delivered at Switchgear Testing and Development Station,Bhopal Name of the Vendor : Offer No and date: SI.No Parameters CPRI Specification/Requirements To be Completed by the Bidder Guaranteed Technical Deviation/Remarks specify if any Particulars (GTP) General conditions required for all the item in serial No. 1 to 5 Mains supply : 230Vac ± 10% (Single phase) Frequency : 50Hz ± 5% Power rating : 100VA SERVICE CONDITIONS : MSL : 523mm Ambient temperature : upto 40 C Humidity : 75-95% Type of installation : Indoor
Detailed specifications: 1) Automatic Instrument Transformer Test Set The instrument shall be capable of measuring accuracy of current and voltage transformers with a single instrument. It shall be capable of fully automatic measurement and digital display of current /voltage ratio errors, phase displacement, test current and voltage for any primary and secondary current and voltage ratings. Measurements shall be possible even for different standard and test transformer ratios without using external divider. The instrument shall meet all the requirements of accuracy measurements as per IEC: 61869-1,2,3 & 5 1.1) Current transformer measuring part The instrument shall take the rated primary and secondary currents as inputs and match the standard transformer ratio automatically Limits of input values: Rated primary current: 50 ma to 1000 ka Rated secondary current: 10 ma to 5 A (Continuously adjustable) upto 210 % Rated primary current: 50 ma to 10000 A Rated secondary current: 10 ma to 5 A (Continuously adjustable) upto 210 % 1.2) Voltage transformer measurement part (Test and standard transformer inputs) The instrument shall take the rated primary and secondary voltages as inputs and match the standard transformer ratio automatically Limits of input values: Rated primary voltage: 3 V to 300 kv Rated secondary voltage: 3 V to 300 V (Continuously adjustable) upto 210% with factors x1/ 3, x1/3 1.3) Current and voltage measurement part Resolution Current / voltage error : 1 ppm (0.0001 %) Phase angle : 0.001 min Test current : 0.001 A Test voltage : 0.1 V Measurement frequency : 0.1 Hz Display : 6-digit LCD measured value displays (height 18 mm) of: Ratio error (current/ voltage) Phase angle (phase displacement), Excitation (test current/voltage) LCD dot-matrix, 2 X 16 characters (height 7 mm) for measurement frequency, entry instructions and error messages Limits of error at current transformer measurements and voltage transformer measurement shall be with respect to the parameters mentioned for measurement during test.
Minimum limits of errors shall be Ratio error Current ratio error : ± 0.5 % of rdg ± 10 ppm ± 1 digit Voltage ratio error : ± 0.5 % of rdg ± 50 ppm ± 1 digit Phase angle Current instrument transformer : ± 0.5 % of rdg ± 0.034 min ± 1 digit Voltage instrument transformer : ± 0.5 % of rdg ± 0.17 min ± 1 digit Excitation Measuring current ± 0.5 % of rdg ± 0.5 % Fs Measuring voltage ± 0.5 % of rdg ± 0.5 % Fs Current comparator The instrument shall be capable of using with any other make instrument transformer test sets. The instrument shall be designed to have zero flux in the core. Specifications Current Rating Primary current 5 to 5000 Amps( with an additional facility for primary current of 1-2-5A) 2) Current Rating Primary current 5 to 5000 Amps( with an additional facility for primary current of 1-2-5A) Secondary current 1 5 Amps Accuracy Ratio error ± 0.001 % for currents 1 to 200 % of rated current Phase angle error ± 0.05 minutes for currents 1 to 200 % of rated current Output power 5 VA max. Protection Built in overload protection shall be provided with overload warning and Temperature warning for excess temperature. The instrument shall be provided with castor wheels for easy mobility. The instrument shall be supplied along with calibration certificate from a laboratory accredited in accordance with ISO / IEC 17025 for full range of 1 % to 210 % at both 1 A and 5 A
Standard Electronic Voltage Divider The system shall comprise of a control unit with capacitive high voltage dividers. The high voltage divider unit shall consist of a high voltage divider and an electronic device in series constituting a variable electronic divider. Technical Specifications Power Supply : 230V, single phase, 50Hz Power rating : 100VA SI.No Parameters Maximum measurement voltage 300kV (with a Divider ratio 1:300) Input Max. input voltage : 1000V Input capacitance < 0.1pF Output Max output voltage : 250V Max output power : 5VA Max. load capacitance : 10nF System parameters Rated primary voltage - Direct input range : 0.01 to 1.0 kv -With capacitive divider :0.010 to 1.00kV(The direct input multiplied by the divider ratio) The multiplication factors x1,x1/ö3,x1/3 Rated secondary voltage input range : 5 to 250 V Multiplication Factor : x1,x1/ö3,x1/3, The required capacitance for divider C1 : 50 pf C2 : 10,000 pf ratio 1 : 300 Interface RS 232C CPRI Specification/Requirements TECHNICAL SPECIFICATIONS 3) The electronic voltage divider must be provided with an adaptor box for interface between the divider and the control unit for 1:1 ratio. Cable must be provided with appropriate connectors for connecting the primary and secondary units of the divider. Length of measuring cable from divider to control unit shall be 10 metres The Control unit and the divider system must be quoted seperately
4) Specifications for Programmable Electronic Current Burden(Optional) The instrument shall be capable of using with any other make instrument transformer test sets. The instrument shall have facilities for total integration in to an automatic measurement system through RS-232. The instrument shall facilitate extension of power levels upto 200 VA through additional passive burdens without change in accuracy. Parameter Rated Power Rated Power : 0.1 to 75 VA Step size : 0.01 VA Power factor cos β Power factor cos β : 0.5 to 1 ind. Step size : 0.01 Rated Current Rated current : 1 and 5 A Current values with factors : 1/1 and 1/ 3 Operating range 1 to 200 % of rated current Maximum burden voltage 150 V Error thresholds Under reference conditions specified in IEC: 359 and frequency of 50 Hz Resistance R / Z ± 1 % Reactance X / Z ± 1 % Under rated service conditions specified in IEC: 359 and frequency of 50 Hz Resistance R / Z ± 3 % Reactance X / Z ± 3 % At 0 VA setting S< 0.05 VA
Parameter Rated Power Rated Power : 0.1 to 75 VA Step size : 0.01 VA Power factor cos β Power factor cos β : 0.5 to 1 ind. Step size : 0.01 Rated Current Rated current : 1 and 5 A Current values with factors : 1/1 and 1/ 3 Operating range 1 to 200 % of rated current Maximum burden voltage 150 V Error thresholds Under reference conditions specified in IEC: 359 and frequency of 50 Hz Resistance R / Z ± 1 % Reactance X / Z ± 1 % Under rated service conditions specified in IEC: 359 and frequency of 50 Hz Resistance R / Z ± 3 % Reactance X / Z ± 3 % At 0 VA setting S< 0.05 VA Additional passive current burden Rated power : 75 VA to 200 VA Rated current : 1 & 5 A Current values with factors : 1/1 and 1/ 3 Power factor 0.5 to 1 inductive Display : The instrument shall have large LCD display for easy operation and display of measurement results Calibration : The instrument shall be supplied along with calibration certificate from a laboratory accredited as per ISO / IEC 17025.
5) Specifications for Programmable Electronic Voltage Burden (Optional) The instrument shall be capable of using with any other make instrument transformer test sets. The instrument shall have facilities for total integration in to an automatic measurement system through RS-232. The instrument shall facilitate extension of power levels upto 400 VA through additional passive burdens without change in accuracy. Rated Power Rated Power 0.1 to 75 VA extendable upto 400VA with 0.8lag p.f Step size 0.01 VA Power factor cos β Power factor cos β 1 to 35 VA: 0.1 to 1 ind. 35 to 75 VA: 0.5 to 1 ind. Step size 0.01 Rated Voltage Rated voltage : 100/110/190/220 V Voltage values with factors 1/1, 1/ 3 and 1/3 Voltage range 2 to 190 % of rated voltage Maximum burden current 12 A Error thresholds Under reference conditions specified in IEC: 359 and frequency of 50 Hz Resistance R / Z ± 1 % Reactance X / Z ± 1 % Under rated service conditions specified in IEC: 359 and frequency of 50 Hz Resistance R / Z ± 3 % Reactance X / Z ± 3 % At 0 VA setting S< 0.05 VA Additional passive voltage burden Rated power 75 VA to 400 VA Rated voltage 100/110/190/220V Voltage values with factors 1/1, 1/ 3 and 1/3 Power factor 0.8 Display : The instrument shall have large LCD display for easy operation and display of measurement results 6) 7) Calibration Manuals The instrument itemwise shall be supplied along with calibration certificate from a laboratory accredited as per ISO / IEC 17025 Two sets in English to be supplied in Hard copy - Operation and maintenance - Drawings - Copy of software -Electrical/ instrumentation
8) Bidder s qualification requirement: 9) Pre-Dispatch Inspection -Technical/ service manual - Circuit diagrams of all PCB's 1. Firms having experience in manufacturing of the above system of the cited rating or higher only are eligible to quote. 2. Customers list for the same to be furnished alongwith the offer includind date of supply, contact person, contact number, e-mail id etc. 3. The quotation shall include detailed diagrams of each component, necessary circuit diagrams of the test system, floor area layout, necessary electrical clearance etc. The equipments/instruments of the test set-up will be inspected at site by CPRI representative before satisfactory delivery to CPRI. Further the test-system will also to be checked on actual test at CPRI Lab to prove its performance in testing as per the standards and specifications concerned to the test object intended. Any instrument with specified accuracy limits in the system should have its calibration traceability with National/International accrediated laboratory. 10) Other terms & conditions : All other terms and conditions shall comply with CPRI's purchase procedure. The circuit diagram, operation manuals, maintenance instructions of the test system/equipment/instrument shall be submitted in duplicate to CPRI alongwith the set up. 11) Training : Two days training on operation and maintenance to CPRI engineers shall be provided. 12) Warranty: One year from the date of commissioning. Note : The price for Sl No. 1 to 5 shall be quoted seperately itemwise. For Sl No.3 (Standard electronic voltage divider ) the price shall be seperately quoted for the capacitor and PN: 1. A detailed technical catalogue/phamlet and other details shall be sent in hard copy in a sealed cover super scribing tender enquiry number and due date so as to reach the following address within the time. This is very much essential to evaluate your offer. 2. Letter of authorization issued by the principal shall be sent by the Indian agents who have offered on behalf of their principals. Address : Joint Director Central Power Research Institute Switchgear Testing and Development Station, Govindpura, Bhopal-462023