REPAIR/MAINTENANCE OF HT VCBs, RMU AND ALLIED WORKS AT MRS AND SUB STATION AT NORTH AREA UNDER AGE E/M (ES) AT GE (U) MEERUT CANTT

M & L for servicing and checking of EXISITING 33 KV Breakers along with 33kV CR Panel indoor type at MRS any make and type make VCB with blower, cleaning of existing HT panel inside & outside with tighting of all bus bar, nut & bolt, alignment, adjustment of gaps between phase to phase as per manufacturer recommended, Checking and tightening of control wiring circuit as charging motor closing coil and tripping coil circuit, Manually tripping testing of VCB, Cleaning, removal of dust and dirt to male/Female contacts, greasing & lubrication all moving fixed part including replacement of minor parts such as spring, washers etc. for smooth mechanical operation etc. complete with testing commissioning as required. Servicing, testing of ( one earth fault one over current) 33 KV /VCB, Operational testing through relay front pad as well as push button, Testingof safety relays, Tripping testing of VCB through over current and earth fault relay,testing and servicing of the existing 33 kV VCB panel, including high pot tests and submission of test certificates with proper sealing. Primary injection testing to verify tripping functionality. Opening of HT panel, removal of moisture from busbars, insulators. Relay settings to be checked as per UPPCL setting and configured as per the protection scheme. Final insulation resistance (megger) testing of all components to be completed as per standard procedures and safety norms complete all as specified and directed. Note : Minor spare part should incl in qouted rates for making functional & major spare may be pay separety as per BOQ items.

M & L for Dismantling of old damaged /bursted bus bar insulators and replacement with new Environment Rating Moderately enabled insulators suitable for Indoor installation with 3-phase 50 Hz, 11 kV systems and they should be designed suitable for service under fluctuations in supply voltage up to ±12%. rules made there under. Nominal system Voltage 11 KV Minimum Specific Creepage Distance 12 KV 230 mm Minimum failing load Visible Discharge Voltage 5 KN 09 KVrms P.F Minimum flash over voltage a) Dry 75KVrms b) Wet 45KVrms , Impulse flashover voltage 1.2/50 micro second wave: a) Positive 95KVp b)Negative 100KVp , Withstand Voltage: a) Dry : 60KVrms b)Wet : 35KVrms 35KVrms Impulse withstand voltage 1.2/50 micro second wave: a) Positive 75KVp b) Negative 80 KVP, Power Frequency puncture withstand voltage 105KVrms complete all as specified and directed.

M&L for calibration of HT VCB indoor type 11 KV & 33kV CR Panel VCB with following calibration of all protective devices or relay according to load, minor repair to wiring connector block etc all as specified and directed by Engr-in-Charge. Note:- (i) Calibration is to be done by auth service person. Secondary Current Injection: Testing Overcurrent (O/C) and Earth Fault (E/F) relays by injecting current into the relay terminals. Load-Based Setting Verification: Verifying and adjusting relay settings (TMS and PSM) based on the specific load requirements provided by the department. Operational Curves: Mapping the relay’s response against IDMT (Inverse Definite Minimum Time) or Definite Time curves to ensure precision. Auxiliary Relay Testing: Checking the Master Trip Relay (86), Trip Circuit Supervision Relay (95), and Annunciation windows. Pickup Value Test (Current Accuracy) contractor has to verify the minimum current at which the relay initiates its "start" or "pick up" signal. Timing Test (Secondary Injection) contractor has to provide The measured operating time is compared against the theoretical time calculated using the relay's curve formula: Contractor has to ensure Acceptance: The measured time must align with the manufacturer’s operating curve (typically within 5% to 10% error margin) complete all specified and directed. Note :- Quoted rate are included with necessary control wiring as per suitable size and core for existing VCB and RMU.

M & L for Isolation, Dismantling & Moisture Removal Operations This section covers the safe de-energization, mechanical isolation, physical dismantling of cable connections, and the deep-drying procedures of the 11kV /33 VCB components.LOTO & Safe De-energization:Take a complete system shutdown under a formal Permit to Work (PTW).Execute strict Lockout/Tagout (LOTO) procedures. Rack out the 11 kV vacuum circuit breaker to the "Test" or "Disconnected" position.Spring Discharge: Manually discharge the closing and opening springs to eliminate stored mechanical energy before handling the chassis.Cable Dismantling: * Dismantle incoming and outgoing power cable connections from the existing VCB terminals safely.Surface Cleaning & De-moisturization:Surface Cleaning: Use lint-free cloths and a high-quality electrical cleaning agent (such as Isopropyl Alcohol or a specialized contact cleaner) to thoroughly wipe down the vacuum interrupters, support insulators, and phase barriers.Puffer & Mechanism Inspection: Inspect the mechanism box to ensure it is completely free of standing water. Pay specific attention to the bottom of the cabinet and inside the spring mechanism housing where moisture naturally accumulates.Crevice Drying: Use dry, low-pressure compressed air to blow out trapped moisture from hard-to-reach crevices within the operating linkage and auxiliary switches.Thermal Conditioning & Space Heater Verification:External Heating: Deploy Infrared (IR) lamps or industrial heat guns (set to low heat parameters) focused directly on the porcelain or epoxy support insulators. Maintain a strict safe distance to prevent localized overheating, thermal stress, or cracking of the

insulation material.Space Heater Retrofitting: Verify the functional health of the panel’s internal heaters. Replace faulty units with high-grade, durable ceramic or aluminum-housed space heaters. Thermostat Calibration: Calibrate the internal cabinet thermostat to activate automatically upon a drop in ambient temperature or a spike in humidity. Configure it to maintain the internal panel temperature at least 5 to 10 degree celcius above the external ambient temperature. Job for important quantitative electrical tests required to verify the complete eradication of moisture and ensure dielectric integrity before returning the VCB to service.Insulation Resistance (IR) Testing:Execution: Perform a comprehensive insulation resistance test utilizing a 1.5 kV or 5{ kV Megger (as per standard practice, though your reference mentions a 15 kV testing range tool context) across all critical boundaries: Phase-to-Phase and Phase-to-Earth.Acceptable Limits: For an 11 kV system, the minimum acceptable IR values must be well above 1000 Ohm. If readings fail to hit this threshold, immediately halt the commissioning step and route back to the heating process defined in Part 1.Vacuum Integrity & Dielectric Validation:High-Pot Testing: Perform a High Potential (Hi-Pot) dielectric test on the vacuum interrupters. This step is mandatory to confirm that the internal vacuum envelope remains intact and has not suffered micro-compromises or gas leaks due to severe external moisture exposure.

M&L for Dismantling of old unserviceable unit and replacement with compact, high-performance digital temperature controller designed for precise thermal management in 11kV Vacuum Circuit Breaker (VCB) panels along with space heaters (also known as anti-condensation heaters) to ensure the internal environment remains above the dew point. with standard electrical requirements for space heaters in 11kV switchgear are:Operating Voltage: Typically 230V AC (Single Phase). Some designs may use 110V AC or 240V AC depending on the auxiliary supply configuration.Wattage Rating: Generally ranges from 60W to 150W per unit. For a standard 11kV VCB panel, 80W or 100W is the most common selection.Dielectric Strength: Must withstand a High Voltage (HV) test of 2kV for 1 minute.Insulation Resistance: Should be >10 MΩ at 500V DC. Enclosure Material: Perforated Stainless Steel (SS) or Anodized Aluminum. The perforated design ensures maximum heat dissipation while preventing accidental contact.Heating Element: Typically a Nichrome or Kanthal wire insulated with high-grade mica or a ceramic-encased cartridge.Mounting: Designed for panel mounting with a preference for horizontal installation to facilitate better convection (chimney effect).Clearance: A minimum clearance of 10mm from the panel surface and 50mm from any plastic components (like wiring or insulators) is standard.To prevent overheating and save energy, heaters are rarely left on continuously. Thermostat Control: Usually paired with a capillary or snap-action thermostat.Typical Setting: Set to turn ON when the internal temperature falls below 30°C to 35°C or if humidity exceeds 70%

Protection: Each heater circuit should be protected by a dedicated 6A SP MCB.Indication: An external "Heater ON" LED indicator is standard on the front instrument panel. With installation at Breaker Chamber: To protect the VCB mechanism and support insulators., Bulbar Chamber: To prevent tracking across bus bar supports & Cable/CT Chamber: Crucial for preventing moisture ingress from cable trenches. The Temprature controller must has following feature Dual Display: Features a 4-digit, dual-line LED display that simultaneously shows the Process Value (PV) in red and the Set Value (SV) in green.Control Modes: Supports PID control with an Auto-tune feature for high precision, as well as simple ON/OFF control for less demanding applications.Input Compatibility: Highly versatile, accepting various sensor types: Thermocouples: J, K, T, R, S. RTD: Pt100. Output Options: Typically comes with a Relay output (5A) and a dedicated SSR (Solid State Relay) drive output (12V DC).Dim-48 x 48 mm (1/16 DIN) Accuracy 0.25% of Full Scale for TC / 0.1% for RTD complete all as specified and directed.

S/I/T/C of Hardware and Site Infrastructure covers the core physical components required, including the specialized current transformers, their integration into existing switchgear, and the basic electrical characteristics of the field equipment. Calibration and programming of protection CTs with a ratio of 100/5A to 500/5A (as required), insulation level voltage of 11 KV, 15 KA for 1 second short time rating, and specific performance criteria for fault current measurement accuracy (Core 3 class PS, KPV >= 150 Volts, Imag at vk/2<= 30 ma, RCT at 75C<= 2 Ohms). These CTs must saturate sufficiently high to allow accurate fault current measurement by high-threshold protection relays, with built-in high Accuracy Limit Factor (ALF) and real accuracy factor. The make must be PARTNER, SIEMENS, SCHNIDER, or ABB, approved by GE and minimum ISO 9001:2015 certified. Integrating CTs with Existing Equipment: The entire work must be executed at the site only by a GE-approved OEM, programming the equipment with protection CTs inside the existing Low Tension (LT) switchgear, breaker, or switching contactors. Necessary test certificates must be approved by the Engineering-in-Charge before execution. Supplying and Installing RTU Enclosure: Furnishing an enclosure with energy meter connections that must support different make models of energy meters in the same daisy chain. Field Device Basic Measurement Capabilities: Providing and programming a multifunction microprocessor digital programmer capable of capturing and displaying a complete set of electrical parameters including: Voltage:

Phase, line, system values. Current: Phase values (neutral current calculated). Power: Apparent, active, and reactive phase and total values. Power Factor: Per phase and total. Frequency: Of measured voltage value. Min/Max/Avg: Value functions for all measurements. Demand: Maximum demand of power and current values. Unbalance & Distortion: Voltage and current asymmetry, total harmonic distortion (THD). Energy Metrics: Active, reactive, apparent partial and total values, per phase and system values. Operational Logs: Hour c