TECHNICAL REQUIREMENTS

TECHNICAL REQUIREMENTS

GENERAL REQUIREMENTS

1. Environment conditions

· Working at indoor, room temperature, tropical climate

· Ambient temperature: +10oC to +40 oC

· Relative humidity: up to 90%

2. Manufacturing year

· Equipment must be manufactured by 2011 or later, with the most up-to-date technology

· 100% new, not ever used.

· No hidden or obvious defect is accepted

3. Model

Contractor must specify code, type of equipment and accessories

II EXISTING EQUIPMENT:

1. Parameters of existing Generator H2 at HAM THUAN plant

· Manufacturer: : General Electric – Canada

· Terminal voltage : 13.8 kV

· Cosφ : 0.85

· Stator rated current : 7,405A

· Number of poles : 20

· Rated frequency : 50 Hz

· Rated speed : 300 RPM

· Rotor overspeed : 550 RPM

· Side rotor-stator air gap : 26.6 mm

· Insulation class : F

· Cooling water’s highest temperature : 35 oC

· Rotor / stator coils temperature : 95oK

· Generator’s moment of momentum : 5,235 Tm2

· Rotor weight : 296 tons

· Stator weight : 150 tons

· Designed hydraulic weight : 400 tons

· Lower cardan’s deflection in the absence of hydraulic load : 0.74

· Lower cardan’s deflection in the presence of hydraulic load : 2.74

· Number of braking jacks : 8 units

· Braking pressure : 7 kg/cm2

· Rotor lifting jack’s displacement : 13 mm

· Oil pressure used when lifting the rotor
for inspection and maintenance : 136 kg/ cm2

· Lubricating oil : ISO VG46

Generator’s Upper Guide Bearing:

· Dimension L x W x H : 300 x 112 x 275 mm

· Made of steel, with 5mm-thick Babbitt lining

· Clearance on one side : 0.2 mm

· Highest allowable working temperature : 75oC

· Individual ring’s weight : 27 kg

· Number of rings : 08

Generator’s Lower Guide Bearing:

· Dimension L x W x H : 340.41 x 131.2 x 205 mm

· Made of steel, with 5mm-thick Babbitt lining

· Clearance on one side : 0.35 mm

· Highest allowable working temperature : 75oC

· Individual ring’s weight : 41 kg

· Number of rings : 20

Generator’s Lower Journal Bearing:

· Dimension L x W x H : 389.97 x 307.5 x 42 mm

· Height of journal spring : 52±0.08 mm

· Made of steel, with 5mm-thick Babbitt lining

· Highest allowable working temperature : 75oC

· Individual ring’s weight : 54 kg

· Number of rings : 16
(each ring includes 29 journal springs)

Turbine Guide Bearing:

Rings are made from SS400+WJ2 steel, surface-coated with a 5mm-thick layer of Babbitt

· Height of ring : 280mm

· Clearance on one side : 0.19±0.015 mm

· Diameter of shaft shoulder’s at ring contact : 1120 mm

· Highest working temperature : 75oC

· Individual ring’s weight : 58 kg

· Number of rings : 10

STATOR:

· Number of phases: 3-phase

· Number of groves: 270

· Connection: Y

· Insulation class: F

· Stator inner diameter: 5,842 mm

· Stator height: 1,783 mm

· Stator weight: 150 tons

ROTOR:

· Number of poles: 20-pole

· Number of windings per pole: 35

· Rotor outer diameter: 5,747 mm

· Rotor weight: 296 tons

· Exciting current: 1281 A

· Exciting voltage: 234 V

· Insulation class: F

2. Existing Monitoring System of HAM THUAN’s Power Generator #2

Currently the unit’s guide bearing has stability probes at the following positions:

+ Upper guide bearing: position 12h

+ Turbine guide bearing: position 12h

The above parameters are read at the gauges mounted in generator room, and calculated using the formula d= dmax – dmin. These monitoring parameters have yet to reach the central control room.

III. TECHNICAL REQUIREMENTS FOR ONLINE MONITORING SYSTEM OF HAM THUAN’S POWER GENERATOR #2

1. System Of Gauging Equipment:

  • The online monitoring of rotor-stator air gap, vibrations, axial instability of HAM THUAN’s Power Generator #2 must have complete data gathering, gauging and analyzing functions on all real time working conditions of the unit. It must provide orientation and guidance in order to rationalize maintenance and repair activities, as well as produce timely warnings regarding any operational anomalies to the unit. The system should help ensure optimal performance, cut down maintenance and repair costs and therefore improve economic efficiency;
  • The data collected by the online monitoring system must be automatically and constantly routed and stored to the central processing station, with a robust analyzing toolkit capable of assisting the management and analysis of the unit’s working status throughout its operating duration, at all working conditions, by the second, hour, month and year;
  • This online monitoring system must be capable of capturing operation signals in real time at very high sampling rate (not less than 5000 samples per second), synchronizing all signal fed to the system. It should ensure expansion and compatibility with existing equipment in Ham Thuan Hydropower Plant. All data fed back to the central station, should be integrated by suitable specialized software, reconstructed the parameters and displayed in a spatial-coordinates perspective, in time.

1.1 Air-gap Gauging System (01 set):

The equipment assembly, complete with sensors, modulator, connection cables, fitting accessories, specifically:

* Gauging sensors:

  • At least 4 measuring points
  • Measuring probes (300x800x5) mm or with thickness less than 5mm
  • Measuring range: from 5mm to 50mm
  • Non-contact capacitance measuring technology
  • Able to work at temperature 125 oC or above
  • Able to work in magnetic field of 1.5 tesla (50Hz) or above
  • Oil- and dust-resistant, accurate measurements in oil and dust environment.

* Gauging modulators:

  • Quantity: matching number of probes
  • Standard output signals: 4- 30mA
  • Accuracy: error <3%
  • Measuring stability (repeat stability) ±0.3%
  • Power source: 24 V

1.2 Bearing Vibration Gauging System (01 set):

Vibration measurements using velocity probes on 3 shaft positions: upper guide bearing, lower guide bearing, and turbine guide bearing. The measurements must be made in both X and Y axis (normal line), with a total number of 6 gauging probes.

  • Vibration gauging points: 6
  • Type: Velocimeter
  • Sensitivity: 100 mV/in/sec
  • Measuring range: 50 in/ sec at peak
  • Frequency range 2.0 – 3500 Hz
  • Power source: 24 V

1.3 Shaft Eccentricity Gauging System (01 set):

  • The shaft eccentricity gauging system must be able to gauge accurately the eccentricity at: upper guide bearing, lower guide bearing, and turbine guide bearing (two existing Omron sensors of the generator unit will be used for the turbine bearing). The measurements must be in both X and Y axis, specifying the vector, shaft center orbit, and Smax values.
  • This eccentricity gauging system must ensure compatible connection with 2 existing sensors of the generator unit.

There are 6 measuring points in all; two of them will be gauged by existing Omron sensors. The remaining sensors must have the following technical requirements:

  • Measuring range: from 0.3mm to 2.3mm
  • Able to work at temperature 80 oC or above
  • Resolution: below 5 micrometer
  • Measuring stability (repeat stability) ±0.3%
  • Power source: 24 V
  • Gauging by capacitance technology. Oil- and dust-resistant, accurate measurements in oil and dust environment.

1.4 Synchronization System (01 set):

  • Consisting of a positioning probe, to locate the shaft true position and synchronize the data received, also to measure the speed of the generator
  • Measuring range: from 0.3mm to 2.3mm
  • Able to work at temperature 80 oC or above
  • Measuring stability (repeat stability) ±0.3%
  • Power source: 24 V
  1. Monitoring Gauges Cabinet

Stationed outside the generator room of the unit. Installed with a processor to handle on-site data (measurement of rotor-stator air gap, shaft eccentricity and bearing vibrations), related equipment and connection assemblies required for the monitoring system.

2.1 Technical requirements

  • The equipment cabinet should be of indoor category, with casing thickness > 2mm, electrostatic ally painted, case’s protection level IP41 compatible for IEC529 Standard
  • Cabinet design should allow opening from the front side to facilitate inspections of all equipment inside. All measuring gauges, switch gears, indicator lamps must be mounted on the front panels.
  • Cabinet door must have suitable handle and padlock.
  • Cabinet must be provided with a copper earthing bar. Earthing terminals are of clamp category to connect to the existing grounding system
  • The inside of cabinet should have proper lighting, using fluorescent lamps that are readily available in local supply. Micro switches are installed on cabinet’s door to activate lighting when in need.
  • Dryers are to be installed to prevent humidity. Manual contact points are also used to control the dryers
  • Cabinet must have nameplates describing the equipment inside
  • All the clamp connectors in the cabinet must be arranged on one proper side to facilitate maintenance jobs such as inspections, check-ups or circuit testing. The clamps must be of appropriate sizes for the incoming cable, and are numbered clearly and with a 10% clamp heads in reserve. The connecting cable heads must be secured with solid terminal lugs and attached with nameplates indicating the connected gear and the number of their corresponding clamps.

2.2 Data Processor At The Generator Unit (In The Cabinet)

The on-site data processor must have capacity to store and process at super high speed, synchronizing gauge data (such as air gap, eccentricity and vibration measurements). The processor must connect with full compatibility with 2 existing Omron sensor that measures the axis eccentricity.

· Round the clock online capacity, twenty for seven operation

· Sampling speed > 500 samples per second

· High speed channel ready, with 16-bit resolution AD channels

· Supports expansion to 128 channels

· Accepts synchronized signals, and synchronizes all measuring data

· RS485 or Ethernet communication standard

· Automatic and regular sample recording

· Able to plot trending graphs for all measuring data

· Ability to record detailed samples in case of irregular parameters (50 instances before and 50 instances after the point of irregularity)

· The displayed parameters should include the following:

o Air gap value, in millimeter (mm)

o Vibrations, in micrometer (μm)

o Shaft eccentricity, in micrometer (μm)

3. DATA COLLECTING STATION

The station has a computer system and specialized monitoring software, linked to the monitoring cabinet position at the generator place. Ready for connectivity expansion to other monitoring gear from other generator units later on.

· Positioned at Central Control Room

· Ability to export data (file export, import)

The minimum configuration would be:

· LCD Monitor screen 19”

· CPU Core2Duo, 1GHz, RAID 5

· DDR > 2GB

· 2 Hard drives > 200GB, reliable to store data up to > 10 years

· Color printer

Monitoring software package, consisting of:

· Data management software,

· Configuration management software,

· Application management software.

· Link software

· License

The monitoring software must be a specially designed one, with English or (Vietnamese) interface, allowing data storing, graphical display in XY Cartesian or angular coordinates, capable of replaying graphically in simulation mode any stored data portion of interest.

The displayed parameters should include the following:

o Air gap value, in millimeter (mm)

o Vibrations, in micrometer (μm)

o Shaft eccentricity, in micrometer (μm)

4. Other accessories:

Complete with installation and connection assemblies for the whole system, including

· Air-gap gauging system’s assemblies for connection to the monitoring cabinet

· Bearing vibration measuring system’s assemblies for connection to the monitoring cabinet

· Bearing eccentricity measuring system’s assemblies for connection to the monitoring cabinet

Communication cables and assemblies linking the monitoring cabinet to station computer in central control room

5. Technical Services:

· Whole-package technical services for installation, adjustment experiments, system configuration, training and guidance for operation

· The services must be quoted in a separate offer, with the investor reserving the right of consideration as to decline or accept these services

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