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Document Number: ECP 11-0213 Date: 30/01/2017 TRANSFORMER (AND REACTOR) TEST FORM Substation Name Substation Number Circuit General Data Serial Number Manufacturer HV Rating - CER MVA Rating - OFAF/ONA MVA Rating - ONAN(ON) AN MVA Nominal Voltage LV1 LV2 Tertiary kV Full Load Current (normal tap) A Vector Group Impedance % HV/LV or HV/LV1 HV/T or HV/LV2 LV/T or LV1/LV2 Tapping Range (+% to -%) in steps of General Checks % HV/LV Winding HV LV Co-ordinating gap electrodes positioned correctly mm Setting of co-ordinating gap mm Setting of bushing arcing horn gap (below 132kV) All bushing and oil filled chambers oil levels correct Air release plugs vented Pressure relief diaphragm intact Earthing connections satisfactory All protective covers and shields fitted All insulators undamaged and clean Complete transformer oil tight Painting visually satisfactory All rating, diagram, identification plates, etc. fitted and satisfactory Tightness of all fastenings Dehydrating breathers satisfactory and pipework joints tight* Refrigeration breathers satisfactory and pipework joints tight* mm THIS IS AN UNCONTROLLED DOCUMENT, THE READER MUST CONFIRM ITS VALIDITY BEFORE USE Version: 3.0 Transformer (and Reactor) Test Form Document Number: ECP 11-0213 Version: 3.0 Date: 30/01/2017 General Checks HV LV All cabling and wiring visually satisfactory Kiosk and cubicle heaters operating satisfactorily Interposing current transformers fitted and wired correctly All compartments clean and tidy All valves in correct operational position All blanking plates satisfactory and correctly stored General Tests Core Primary Insulation ( or n/a) Core (2000V AC or 2500V Insulations Resistance Tester) Core to clamping structure (MΩ at…..) Windings Primary Insulation ( or n/a) Insulation resistance 100V DC (MΩ at……..) HV LV1 To all other windings, core frame and tank connected together & earthed Tertiary or LV2 © UK Power Networks 2017 All rights reserved 2 of 12 Transformer (and Reactor) Test Form Document Number: ECP 11-0213 Version: 3.0 Date: 30/01/2017 Ratio and Magnetising Current Tests Ratio checked at all taps, and voltage continuity during tap changing. At the same time HV magnetizing current measured on maximum, normal and minimum tapping positions (with a 3phase 4-wire low voltage supply connected to HV terminals and star point, with normal earth connection to star point disconnected). Tap Number HV Voltage (V) A-N A-B B-N B-C C-N C-A HV Magnetising Current (mA) A B C LV1 Voltage (V) a-N a-b b-N b-c Tertiary or LV1 Voltage (V) c-N c-a 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 © UK Power Networks 2017 All rights reserved 3 of 12 Transformer (and Reactor) Test Form Document Number: ECP 11-0213 Version: 3.0 Date: 30/01/2017 Vector Group Check Connect one HV terminal to one LV (or Tertiary) terminal. With the transformer on nominal tap measure the following voltages, as necessary. HV - LV1 A-a2 A-b2 A-c2 B-a2 B-b2 B-c2 C-a2 C-b2 C-c2 A- A- A- B- B- B- C- C- C- HV - LV2 or Tertiary © UK Power Networks 2017 All rights reserved 4 of 12 Transformer (and Reactor) Test Form Document Number: ECP 11-0213 Version: 3.0 Date: 30/01/2017 Vector symbol from test Checking vector groups according to BS 171 BS 171 Vector Group Vector Diagram HV LV Combination of HV and LV sides for comparison Dd0 Yy0 Connection for measuring of vector position Connect A to a. Energise terminals ABC with three phase voltage. Measure between Bb, Cc, AB, Bc Voltage relationship: 1. Bb = Cc 2. Bb < AB Dz0 Dd6 Yy6 3. Bb < Bc Connect A to a. Energise terminals ABC with three phase voltage. Measure between Bb, Cc, AB, Bc Voltage relationship: 1. Bb = Cc 2. Bb > AB Dz6 Dy1 Yd1 3. Bb > Bc Connect A to a. Energise terminals ABC with three phase voltage. Measure between Bb, Cc, AB, Bc Voltage relationship: 1. Bb = Cc 2. Bb < AB Yz1 Dy11 3. Bb < Bc Connect A to a Energise terminals ABC with threephase voltage YD11 Measure between Bb, Cc, AB, Cb Voltage relationship 1. Bb = Cc Yz11 2. Bb < AB 3. Cc < Cb © UK Power Networks 2017 All rights reserved 5 of 12 Transformer (and Reactor) Test Form Document Number: ECP 11-0213 Version: 3.0 Date: 30/01/2017 Vector and Phasing Diagrams Substation Transformer Number Voltage Ratio MVA Rating Group Reference to BS 171 Engineer Signature Date Vector Diagram Primary HV Tertiary or Secondary LV2 © UK Power Networks 2017 All rights reserved Secondary LV 6 of 12 Transformer (and Reactor) Test Form Document Number: ECP 11-0213 Version: 3.0 Date: 30/01/2017 Phasing Diagrams Transformer HV Phase Colours HV Terminal Markings Note: 1. Mark position of cable boxes if fitted. 2. Mark position of neutral terminals. 3. Mark position of tertiary terminal and identify. A n1 B a1 b1 C c1 n2 N a2 b2 c2 LV Terminal Marking LV Phase Colours LV Switchgear incoming connections looking at the front LV Busbars arrangements and incoming phase colours looking at the side Back Front Motors and Overload Devices of Pumps, Fans and Tap Changer Motor Direction of Rotation Correct Overload Device Set at Rated Current A Maximum Trip Operation Time s Starting with one fuse removed Running and one fuse removed Tap changer Pumps Fans Note: The above checks shall apply to individual motors and each phase of individual overload devices. The values tabled shall be the maximum for any type of motor. © UK Power Networks 2017 All rights reserved 7 of 12 Transformer (and Reactor) Test Form Document Number: ECP 11-0213 Version: 3.0 Date: 30/01/2017 Buchholz Device Transformer Tap Changer Serial Number Manufacturer Type Inclination (degrees) Longitudinal (3-7) Lateral (0-5) Quantity of air to operate ml to make Alarm contacts ml to break Approx. minimum air pressure to operate surge contacts and type of equipment used Check surge and gas contacts stable when starting coolers, auto and manual with oil cold, and when pipework vibrates etc. State oil temperature Temperature Indicators Number 1 Number 2 Number 3 Manufacturer Serial Number Associated Winding Contact Function Setting Function Setting Function Setting Contact Function & Setting © UK Power Networks 2017 All rights reserved 8 of 12 Transformer (and Reactor) Test Form Document Number: ECP 11-0213 Version: 3.0 Date: 30/01/2017 WTI Heater Coil Circuits Note, where tests have been carried out at the Contractor’s works, these are required only as approximate check tests Number 1 Number 2 Number 3 CT Ratio Ratio confirmed on load or by primary injection (record results on test form ECP 11-0303) Heater coil resistance Nominal ONAN Shunt resistance across heater coil Heater coil test: current injected (FLC) A Top oil temperature °C Initial temperature °C Steady temperature after minutes °C Temperature increment °C OFAF ONAN OFAF ONAN OFAF Calibration test on WTI indications and adjustment on repeaters Number 1 WTI WTI Repeater Test Temperature °C Indicator Reading °C Indicator Reading °C Repeater/Telecontrol Reading °C Inspection of Site Wiring Number 2 WTI Number 3 WTI ( or n/a) Insulation (see test forms ECP 11-0301 and ECP 11-0217) Kiosk, tap change and cooling equipment wiring checked to: Circuit Diagram Number ………………………………….. Revision ............ Wiring Diagram Number ………………………………….. Revision ............ © UK Power Networks 2017 All rights reserved 9 of 12 Transformer (and Reactor) Test Form Document Number: ECP 11-0213 Version: 3.0 Date: 30/01/2017 Operational Tests ( or n/a) Tap Change Equipment Raise Lower Cooler B Cooler C Maximum interval between operating times of Diverter Switches of single phase tap changers* Local raising and lowering (full range) Remote raising and lowering (full range) Local/Remote Switch Stepping Relay Hand operation and handle interlock switch Check maintaining circuit for correct sequence Limit switches proved (in motor and control circuits) Mechanical position indicator Remote electrical position indicator including accurate indication of all positions Tap Change Incomplete Alarm including accurate indication of all positions Tap Change Counter operates correctly Tap Change Counter Reading Initial/Final Cooling Equipment Operations, Alarms & Indications Cooler A Cooler control switch Auto control from WTI Time delay for pumps (Auto) s Time delay for pumps (Manual) s Differential pressure alarm Pump failure alarm Auto-start of standby pump Stand-by pump running indication Cooler fail alarm Fuse ratings correct Refrigeration Breather Check freeze/thaw cycle in accordance with Manufactures instructions © UK Power Networks 2017 All rights reserved 10 of 12 Transformer (and Reactor) Test Form Document Number: ECP 11-0213 Version: 3.0 Date: 30/01/2017 DC Operations ( or n/a) Plant Terminal Block Flag Relay Surge trip Gas alarm Winding temperature indicator 1 trip Winding temperature indicator 1 alarm Winding temperature indicator 2 trip Winding temperature indicator 2 alarm Winding temperature indicator 3 trip Winding temperature indicator 3 alarm Breather device fail alarm Oil Test ( or n/a) Oil samples from top and bottom of tank, also tap change compartments. These shall be taken in an approved manner to prevent oil being in contact with atmosphere. Oil supplier Oil samples tested © UK Power Networks 2017 All rights reserved 11 of 12 Transformer (and Reactor) Test Form Document Number: ECP 11-0213 Version: 3.0 Date: 30/01/2017 Comments Test Equipment Purpose Make/Type Serial Number Certification () All tests have been completed satisfactorily Contractor Commissioning Engineer (if applicable) Organisation Name Date Signature UK Power Networks Commissioning Engineer Name © UK Power Networks 2017 All rights reserved Signature Date 12 of 12