*USS- Unit Substation

/ HOTO
(Handing Over and Taking Over)
UNIT SUBSTATION / F04(PRJ(WND)-P-01)
Rev 00
Project Name
Name of the Connected Substation
Date of Commissioning of USS
No. of USS & Voltage level
WECs Details
Contractor Name & Address

On date :______with attached list of pending points (annexure-I) the USS as per the above details is handed over to the O&M Department for Operation and Maintenance .However final HOTO will commence only after completion of listed pending points with a timeline of next 30Days .

ReNew’s Project Team
Name / Designation:
Signature:
Date: / ReNew’s O& M Team
Name / Designation:
Signature:
Date: / Third Party Engineer
Name / Designation:
Signature:
Date:

1. HandoverofDocuments:

Sl.
No. / Description of Documents / Status / Remarks
‘√‘ / ‘ X ‘
A / Electrical Drawings:
1 / Single Line Diagram
2 / Protection Key SLD
3 / Earthing layout (with design calculation)
4 / Unit Substation layout- Plan/ Sectional
6 / Metering yard layout-Plan/Sectional
7 / Technical specifications of major component -Trafo, CT,PT,CB and LA system, Isolator, C&R panel, etc
8 / Bill of quantity (BOQ)
9 / Approved vendor list for major components used.
10 / Critical Spares List.
B / Quality Documents & Manuals
1 / Quality assurance plan(QAP) of materials
2 / Field quality plan (FQP), Pre-commissioning Site TestReport for work.
3 / Unit Substation installation/ construction manual
C / Statuary Documents
1 / CEIG Charging Permission Letter.
2 / CEIG Approved drawing for USS & Metering Yard

Remarks (if any):

2. USS check list:-

Date: / USS No.:
Sl. No. / Details of Check Point / Status / Remarks
‘ √ ‘ / ‘ X ‘
A / HT Yard
1 / Fire Buckets filled with clean dry sand with top cover.
2 / USS free from grass, shrubs, unwanted material
3 / Danger board provided on yard door/DP structure
4 / VCB foundation free from cracks and bolts in proper position.
5 / DP structure parallel to each other - Visually
6 / Poles are galvanized with minimum Zn coating as per the drawing.
7 / 1/6th pole length buried under ground level.
8 / DP Stay wire are properly tightened with insulator in between.
9 / Physical condition of pole muffing. It is free from damage slop at the top.
10 / Positioning of equipments as per the approved drawings (No deviation).
11 / Fence wall and mesh are intact, properly welded and free from any type of damage.
12 / Earth Pit Pipe and Earthing Strio connection are free from damage and properly welded/bolted.
13 / Earth Pit Collar and cap are free from damage.
14 / Earth pit identification as per the drawing.
15 / HT Yards door alignment and locking arrangement.
16 / HT Yard surrounding and entry are free from obstacles and grass.
17 / Gravelling in yard with Min 20/40 mm size @ 4” thickness and properly levelled.
B / USS Transformer
1 / Physical condition of transformer and accessories. It shall be free from damage and no oil leakage.
2 / Oil Level in transformer conservator – Above 1/4th mark in MOG
3 / Tap position of transformer. Tap No. ___
4 / Silica Gel status in breather. It should be blue in color.
5 / Cable termination in the marshalling box. It shall be tight and as per the wiring diagram.
6 / Body and Neutral Earthing status
1)At two positions
2)Torque Mark Visible
7 / Explosion vend diaphragm shall be intact.
8 / OTI/WTI trip and alarm setting of Transformer
1)OTI Alarm/Trip= 80/85 degree C
2)WTI Alarm/Trip= 85/90 degree C
9 / Proper alignment of arcing horn.
10 / Cable connection at Junction Box- Properly tightened.
11 / LV Cable laying through GI pipe as per the drawing.
C / Vacuum Circuit Breaker (VCB)
1 / Physical Condition of VCB, CRP and VCB-CT mounting structure. It shall be free from damage.
2 / Earthing of VCB & VCB Panel at two points.
3 / VCB terminal connection. Properly tightened and torque mark visible
4 / Manual Spring Charging- Flag indication -ON
5 / Manual operation test of VCB for ON & OFF Indication (Isolator in open condition).
6 / Relay Control Panel Wiring shall be properly tightened and as per the wiring diagram.
7 / Relay setting for O/C, E/F & Inst E/F relay (for CT Ratio)
1)O/C relay: 160% TMS 0.05, TMS fine set at fine, O/C curve set at 10 N 1.3 sec.
2)E/f relay set : 10 % set at 0.1 TMS, TMS fine set at fine.
3)NCT operated E/F relay set at 10 %
8 / Proper sealing of gland holes & cable entry pipe in VCB, CRP and transformer marshalling box.
9 / Healthiness of indication lamp. Indication for DC supply healthy, spring charge and VCB On/Off.
10 / VCB Trip function activation on OTI/WTI/OC/PRV/Earth fault.
11 / RYB Indication on VCB Poles. Properly painted and visible.
12 / Proper access/stand for operation of VCB Panels.
D / Surge Arrestor
1 / Physical condition of insulator. No crack, damage and free from dust.
2 / Mounting of LA with surge counter. Properly aligned and torque mark visible.
3 / Earthing connection at two points with Earthing strip.
E / Current & Voltage Transformer
1 / Physical condition of CT/PT. No crack, damage, oil leakage and free from dust.
2 / Mounting of CT & PT. Properly aligned and torque mark visible.
3 / Link for unused core of CT
4 / Primary & secondary connection of CT & PT. It shall be properly tightened.
5 / Earthing connection at two points with Earthing strip.
F / Isolator
1 / Physical condition of isolator. No crack, damage and free from dust.
2 / Mounting of Isolator. Properly aligned and torque mark visible.
3 / All terminal connectors are properly tightened.
4 / Operation of Isolator (VCB in off condition)
1)Synchronized
2)Smooth opening and closing of Isolator.
5 / Provision of Lock
6 / Earthing connection at two points with Earthing strip.
7 / Operating handle for isolator is available.
8 / Placing position of isolator handle shall be 1300 mm from ground.
G / Pin & Disc Insulator
1 / Physical condition of insulator. No crack, damage and free from dust.
H / HG Fuse (wherever applicable)
1 / Physical condition of fuse. No breakage and free from dust.
2 / Mounting of HG Fuse, properly tightened.
3 / Fuse element with tight connection
4 / Earthing connection of HG Fuse. Properly tightened.
I / Tri-vector Meter (wherever applicable)
1 / Terminal Wiring, sealing provided on the cover of TVM. It shall be as per wiring diagram
J / CT- PT Metering set (wherever applicable)
1 / Physical condition of CT-PT Unit. No crack, damage, oil leakage and free from dust.
2 / Mounting of CT –PT Unit. Properly aligned and torque mark visible.
3 / Tightness of jumper termination to HV terminals
4 / Tightness of cable termination in secondary terminals.
5 / Tightness of Neutral link in case of PT.
6 / Earthing connection at two points with Earthing strip.
K / Earthing
1 / Earthing pit with collar/chamber and identification number.
2 / Earthing connections are tight, proper welded and as per the earthing drawing.
3 / Earth resistance report with combined earth resistance < 1 ohm
4 / Earthing Flat Joints
1)Welding at 4 sides
2)Zinc paint /black bituminous paint on welded part.
L / General
1 / Fire Extinguisher and safety chat shall be available.
2 / 33kV Discharge rod and 36kV working potential hand gloves (class 4) shall be available.
3 / Proper stringing from tap cut point with propoer tightening and no sag.
4 / Guard Wire for each road and line crossing shall be available.
5 / Serial No’s of all equipments of HT Yard shall be provided.
6 / All equipment drawings, maintenance manual and test reports shall be provided.

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