Micro-hydropower Plant. Site Completion Test Manual
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1 MHP 4 DEPARTMENT OF ENERGY ENERGY UTILIZATION MANAGEMENT BUREAU Micro-hydropower Plant Site Completion Test Manual June 2009
2 This manual was developed by the Department of Energy (DOE) through the technical assistance under the Project on Sustainability Improvement of Renewable Energy Development for Village Electrification in the Philippines which was provided by the Japan International Cooperation Agency (JICA).
3 Table of Contents 1 General Scope Objectives Implementation structure Management structure Roles and responsibilities Test Instruction Civil and metal structures Common Gate and stoplog Concrete structures Operation & maintenance manuals/instructions Documents to be prepared Electro-mechanical equipment Inlet valve and drain valve for penstock water Comprehensive test Operation & maintenance manuals/instructions Documents to be prepared Transmission and distribution facilities Common Operation and maintenance manuals/instructions Documents to be provided Amendment of the manual... 8
4 LIST OF ANNEXES ANNEX 1 ANNEX 2 : Appearance checklist for civil and metal structures : Example procedures of comprehensive test for electro-mechanical equipment
5 1 General This manual is intended to specify standardized test items and procedures for the completion test of micro-hydropower plants. Accordingly, an actual on-site test was conducted taking into account the real conditions of the plants which served as the reference basis for the test instructions and record forms shown in this manual. 2 Scope This manual shall be used for the on-site completion test conducted in conjunction with the new construction of micro-hydropower plants. Users also may utilize this manual for performance tests after the rehabilitation and upgrade of existing micro-hydropower plants by choosing the appropriate test items. 3 Objectives The objectives of this manual are: (1) to verify if the installed equipment meets the requirements, and (2) to secure the safety of the equipment and people after commissioning through the precise implementation of a field performance test. 4 Implementation structure 4.1 Management structure The following figure shows the management structure of the completion test. Proponent Inspection report/ Drawings Specifications Manufacturer/ Supplier Instruction/ Advice Report Implementation of test Contractor Assistance Mobilized Local Residents Figure 1 Implementation structure of the completion test 1
6 4.2 Roles and responsibilities The roles and responsibilities of each component in the planning and implementation of the completion test have been summarized in the following table. Component Proponent Contractor Local residents Role Factory inspection report/drawing collection Test plan approval Test result approval Test record maintenance Test plan preparation Test implementation Asssistance in implementing the tests (1) Factory inspection report/drawing collection The proponent shall collect factory inspection reports and drawings for purchased equipment from manufacturers/suppliers prior to their acceptance. Even in the case of standardized equipment, submission of related documents that show the characteristics of the equipment shall be required for future maintenance. (2) Test plan preparation The contractor shall prepare a plan for the completion test and submit it to the proponent in advance for approval. Test items shall be identified according to the composition of the installed equipment and concrete test procedures shall be proposed for each test item. (3) Test plan approval The proponent shall review the submitted test plan to be approved after providing necessary instructions to the contractor. (4) Test implementation The contractor shall conduct the completion test in accordance with the approved test plan and record the results on the record forms. The local residents shall assist with the implementation of on-site testing. Test records shall be submitted to the proponent for approval. (5) Approval of test results The proponent shall review the submitted test record to be approved after providing necessary advice and instruction to the contractor. (6) Test record maintenance Test records shall be maintained by the proponent. 2
7 5 Test Instruction 5.1 Civil and metal structures Common (1) Appearance check Civil and metal structures shall be inspected visually to identify any defects and/or evidence of water leakage. Examples of checklist items are shown in ANNEX1. (2) Dimensional test A dimensions test of civil and metal structures shall be implemented based on the drawings to ensure that these structures possess the required capabilities. The criteria for evaluation are as follows: Item Instruments Criteria Location Elevation, Slope Length, Size Measuring tape Transit Level gauge Within 500 mm Within 100 mm * Penstock shall not be inverse or horizontal Within smaller value of 5% of design value (3) Water-filling and dewatering test A watertight inspection along the waterway shall be executed by means of a water filling and dewatering test. The targets include the weir, the headrace open channel, the settling basin, the spillway, the penstock, the powerhouse, the tailrace, and their auxiliary structures, such as the gate and stoplog. Leakage shall not be observed during this test (10-minute operation under maximum design head and design discharge). (4) Operation test An operations test shall be conducted in order to verify that no serious vibrational disturbance of the civil and metal structures will occur when the plant and equipment are in operation Gate and stoplog (1) Running test A running test shall be carried out to verify the smooth and reliable operation of the gate and stoplogs. 3
8 5.1.3 Concrete structures (1) Crack inspection No cracks larger than 0.4 mm shall be allowed on the concrete structures through which water is run such as the weir, the headrace open channel, the settling basin, the spillway, and the tailrace. Photographs and sketches are useful for monitoring development of the cracks Operation & maintenance manuals/instructions The contractor shall submit operation and maintenance manuals/instructions. Methods and frequency of inspection, repair and maintenance (including painting of penstock, gate and screen, sand flushing valve etc.) shall be described in the manuals/instructions Documents to be prepared The contractor shall provide the following documents one week prior to the completion test. (1) As-built drawings (layout, major structures) (2) Head-loss calculation (3) Maximum output power calculation 5.2 Electro-mechanical equipment Inlet valve and drain valve for penstock water After the inlet and drain valve for the penstock have been installed, and before putting the unit into service, the following performance tests shall be carried out by the contractor. (1) Watertight test To check water leakage from a closed inlet valve and measure the amount if necessary. Test item Content Watertight test To check the water leakage from a closed inlet valve and measure the amount if necessary Comprehensive test After the electro-mechanical equipment, such as the turbine, generator, control panel, and auxiliaries have been installed, and before putting the unit into service, the following tests shall be carried out by the contractor in order to verify comprehensive performance. A series of example procedures for each test are shown in ANNEX2. 4
9 Test item Visual inspection Earth resistance measurement Insulation resistance test Initial run test Bearing run test Excitation characteristic test Protection function test DL governor function test Output vs. guide vane opening test *1 Load rejection test *2 Load run test Overnight operation data collection Content To check visually the installation conditions of the electro-mechanical equipment in the powerhouse. To measure the earth resistance using an earth tester at the grounding electrode, and check that the equipment is connected firmly to the electrode. To measure the insulation resistance of the generator windings and the dummy load heaters using an insulation tester, and check that they maintain the necessary insulation performance. To check for any abnormal sound, vibration and contact with the stationary parts by rotating the turbine-generator at low rotational speed. To measure the temperature rise of the bearings and the generator cover by continuously operating the generator-turbine at the rated rotational speed and no load. To measure the generator voltage, exciter voltage and exciter current for the frequency stepwise changed in the no load operation, and draw a graph of the excitation characteristic. To check the characteristics and setting values of protective functions for the ELC panel box by changing the values of the trimmers. To check that the frequency is kept constant regardless of a change in the actual load which is substituted by a water resister. To measure the relationship between the guide vane opening and the generator output. To check that the frequency is kept constant regardless of a sudden change in the actual load by manually cutting off the parallel-in circuit breaker (MCCB). To measure the temperature rise of the bearings and the generator cover by continuously operating the generator-turbine at the rated rotational speed and full output. To check that the dummy load governor functions properly during actual operations. Notes: *1 The total and turbine efficiency can be estimated by measuring the turbine discharge via utilization of a portable ultrasonic flow meter during the test. *2 The load rejection test is to be used for a system equipped with a governing system such as a dummy load governor. 5
10 5.2.3 Operation & maintenance manuals/instructions The contractor shall submit operation and maintenance manuals/instructions. Assembling and disassembling methods, maintenance period, and the interval of greasing, etc. for the following equipment and devices is described in the manuals/instructions. (1) Turbine (2) Generator (3) Inlet valve (4) Driving system (5) Governing system (Electronic Load Controller: ELC) (6) Automatic voltage regulator (AVR) (7) Generator panel Documents to be prepared The contractor shall provide the following documents. (1) Single line diagram main & control circuits (2) Power plant equipment layout drawings (3) Specifications and generator panel drawing (4) Unit control & protection system diagram (5) Drawings of the dummy load heater (6) Drawings of the inlet valve (7) Drawings of the connecting pipe (8) Connection diagrams of the generator panel (9) Connection diagrams of the AVR (10) Connection diagrams of the governor (11) Connection diagrams of the control system (12) Efficiency and output curve of the turbine (13) Efficiency curves of the generator (14) Test reports for all equipment/devices (15) List of tools and spare parts (16) Operation and maintenance manuals/instructions for all equipment/devices 6
11 5.3 Transmission and distribution facilities Common After the transmission and distribution facilities have been installed, and before putting the unit into service, the following tests shall be carried out by the contractor. Test item Visual inspection Earth resistance measurement Insulation resistance test Power transmission test Content To check visually that the transmission and distribution line components, such as the pole, cross arm, insulator, guy wire, cable, conductor, switchgear, and arrester are installed adequately, and that offset distances between the conductors and trees are maintained by walking along the route. To measure the earth resistance using an earth tester at the grounding electrode, and check that the equipment is connected firmly to the electrode. To measure the insulation resistance of the cables and conductors using an insulation tester, and check that they maintain the necessary insulation performance. To check visually the condition of the transmission and distribution lines energized by operating the generator-turbine, and verify that they are installed adequately without short circuits and grounding Operation and maintenance manuals/instructions The Contractor shall submit operation and maintenance manuals/instructions. Assembling and disassembling methods, and maintenance period, etc, for the following equipment and devices shall be described in the manuals/instructions. (1) Transformers (2) Circuit breaker (3) Lightning arresters (4) Fuse cutouts and fuse links Documents to be provided The Contractor shall provide the following documents: (1) Distribution line route drawing (2) Single line diagram distribution line (3) Supporting structure arrangement drawings for the distribution line, including the service wire (4) Detailed drawings of a fuse cutout 7
12 (5) Detailed drawings of lightning arresters (6) Specifications and drawings of conductors/cables (7) Specifications and drawings of insulators and hardware (cross-arm, strap, u-bolts, bands, etc.) (8) Test reports for all equipment/devices (9) List of tools and spare parts (10) Operation and maintenance manuals/instructions for all equipment/device 6 Amendment of the manual The DOE shall review this manual annually, and amend it, if necessary, according to the surrounding circumstances in rural electrification of the country. The amended manual shall be fully authorized among the DOE and approved by Director of Energy Utilization Management Bureau of the DOE. 8
13 ANNEX1 Appearance checklist for civil and metal structures (1/2) Equipment Item Check Method Result Remarks Weir body Appearance check Sliding timber Water leakage Insert condition Intake weir Bar screen Appearance check Intake Appearance check Stability of water intake Intake Intake body Appearance check Stability of water intake Forebay body Appearance check Checking of variation in WL in operation Forebay Screen Appearance check (Pitch, Installation angle) Flushing gate Appearance check Gate operation Operational check Water leakage Bank protection / Retaining wall Bank protection / Retaining wall Appearance check Appearance check Penstock Penstock Leakage from welded area Vibrations in operation and palpation Expansion pipe Leakage Small supporting table Fixed base Air pipe Appearance check Appearance check Appearance check Other Slope along penstock i
14 Appearance checklist for civil and metal structures (2/2) Equipment Item Check Method Result Remarks Aqueduct bridge Penstock Appearance check Powerhouse Powerhouse Appearance check Appearance check Tailrace Tailrace body Condition of water discharge (Positional relation with riverbed) Temporary road Others Temporary road Other Appearance check Slope along temporary road Condition of riverbed around intake Disposal of surplus soil Reconnoitering Additional comments ii
15 ANNEX2 Test item Purpose Visual inspection To verify the installation conditions of the equipment as well as the cable connection. Procedure To inspect visually the installation conditions of the following equipment. (1) Turbine (2) Generator (3) Driving system (4) ELC panel box (5) Dummy loads and safety fence (6) Cable (condition of laying, connection and terminal) (7) Circuit configuration (consistency with the single line diagram) Precaution To take note of damage of the control board, faulty wiring, and looseness of the screws that might be caused by the transportation and installation. Instrument Criteria All equipment is properly installed. Cables are properly laid and connected. Main circuit is constructed in accordance with the single line diagram. i
16 Test item Purpose Earth resistance measurement To verify the earth resistance of the grounding electrode and connections between the electrode and equipment 1. Earth resistance measurement (1) To drive the auxiliary earthing rods P and C deep into the ground, at intervals of 5 10 m (straight line) from the measurement object E (2) Battery check (3) Earth voltage check (4) Auxiliary earthing resistance check (5) Earth resistance measurement Procedure 2. Earthing connection check (1) To set the tester to connection check (2) To connect the two (2) lead wires to the grounding electrode and the grounding terminal of the following equipment respectively Generator stator winding Base flame ELC panel box (3) To verify the connection of the grounding cable by the circuit tester Precaution Instrument Earth tester Circuit tester Criteria Earth resistance of the grounding electrode is at a sufficiently low setting The equipment s grounding terminal is firmly connected to the grounding electrode. ii
17 Test item Purpose Insulation resistance measurement To verify the insulation performance of the equipment by measuring the insulation resistance. To apply voltage of 500V between the measured circuit and the earth, and record the value of the insulation resistance after 1 minute. As for a generator, to continue the measurement for 10 minutes and derive the polarization index (PI) from the 1-minute value and 10-minute value in order to verify the moisture absorption of the coils. Procedure PI = 10-minute value of insulation resistance (MΩ) 1-minute value of insulation resistance (MΩ) The measurement is conducted for the following circuit sections. (1) Generator stator coil (including main circuit) (2) ELC panel box (3) Dummy loads including wiring (4) Distribution lines Precaution Residual charge must be completely discharged by shorting to earth after the measurement Instrument Insulation resistance tester (Digital MΩ HiTester) Circuit: Insulation resistance (MΩ)>0.2MΩ Rotating machine (To meet the following conditions) a. Insulation resistance (MΩ)> Rated voltage (V) Rated output (kw)+1,000 Criteria Rated voltage (V)+Rated speed (min -1 )/3 b. Insulation resistance (MΩ)> +0.5 Rated output (kw)+2,000 c. PI > 1.5 * The above criteria should be used as a reference because it is difficult to estimate progress of insulation deterioration from only the value of the insulation resistance. iii
18 Test item Purpose Initial run test To confirm abnormal sound and vibration by rotating the turbine -generator at low rotational speed Procedure Equipment conditions before testing: (1) Inlet valve: Open (2) Guide vane: Close (3) MCB for the main circuit inside the ELC panel box: Open (4) ON/OFF switch on the ELC panel box: OFF Test procedure: (1) To open the guide vane gradually and rotate the turbine-generator at low rotational speed (2) To close the guide vane immediately after the turbine-generator starts rotating (3) To record the operation data ON/OFF Switch MCB ELC panel box Precaution The guide vane must be operated carefully to avoid a rapid speed increase of the turbine-generator Instrument Tachometer Criteria Contact between the stationary and rotary part is not observed Abnormal sound and vibration are not observed in each part of the turbine-generator iv
19 Test item Purpose Rated speed run test To confirm the existence of any abnormal sound, odor, vibration and/or temperature rise in each part of the turbine-generator by rotating the turbine -generator at the rated speed Procedure Equipment conditions before testing: (1) Inlet valve: Open (2) Guide vane: Close (3) MCB for the main circuit inside the ELC panel box: Open (4) ON/OFF switch on the ELC panel box: OFF Test Procedures: (1) Set the Clamp on Power Hitester to the main circuit (2) Open the guide vane gradually and rotate the turbine-generator at the rated speed (3) Record the operation data (4) Close the guide vane after the bearing temperature is saturated. Precaution Instrument Tachometer Infrared thermometer Ultrasonic flow meter Clamp on Power HiTester Criteria Abnormal sound, odor, vibration and temperature rise are not observed in each part of the turbine-generator v
20 Test item Purpose Excitation characteristic test To measure excitation characteristics of the newly installed generator as the initial data Procedure Equipment conditions before testing: (1) Inlet valve: Open (2) Guide vane: Close (3) MCB for the main circuit inside the ELC panel box: Open (4) ON/OFF switch on the ELC panel box: OFF Test Procedures (1) Check the connection of the clamp tester set to the main circuit (2) Set another Clamp on Power Hitester to the excitation circuit (3) Open the guide vane gradually to turn over the turbine-generator (4) Increase the rotational speed to 110% of the generator rated speed by 10% (5) Measure the terminal voltage, excitation voltage, and excitation current at each point (6) Close the guide vane after testing (7) Remove the clamp tester for the excitation circuit Precaution Instrument Tachometer Ultrasonic flow meter Clamp on Power HiTester Clamp meter The generator generates the rated voltage at the rated rotational speed Criteria vi
21 Test item Purpose Protection function test To verify the adjustable range for the set point of the protection function that the ELC is equipped with and to set the operating value Procedure Equipment conditions before testing: (1) Inlet valve: Open (2) Guide vane: Close (3) MCB for the main circuit inside the ELC panel box: Open (4) ON/OFF switch on the ELC panel box: ON Test Procedures: (1) Check the connection of the clamp tester set to the main circuit (2) Open the guide vane gradually and operate the turbine-generator at the rated speed and voltage (3) Increase/decrease the frequency and voltage by changing the frequency set point and verifying the adjustable range for the set values of each protection function Over voltage Under voltage Over speed Under speed (4) Set the operating point after verifying (5) Close the guide vane after testing Precaution Clamp on Power HiTester Instrument Each protection function operates at the set value Criteria vii
22 Test item Purpose Dummy load governor function test To verify that the frequency is kept constant even during the load change operation by normal functioning of the ELC Procedure Equipment conditions before testing: (1) Inlet valve: Open (2) Guide vane: Close (3) MCB for the main circuit inside the ELC panel box: Open (4) ON/OFF switch on the ELC panel box: ON Test Procedures: (2) Check the connection of the clamp tester set to the main circuit (3) Set another Clamp on Power Hitester to the dummy load circuit (4) Connect the water resister to the secondary terminal of the MCB after removing the distribution lines (5) Close the MCB inside the ELC panel box (6) Open the guide vane gradually until it is fully opened and increase the generator output to the maximum * At this stage, the dummy load consumes all the generator output (7) Record the operation data at 0% of the actual load (8) Increase the actual load by inserting electrodes of the water resistor to the water tank (9) Record the operation data at 20%, 40%, 60%, 80%, 100% of the actual load (10) Close the guide vane after testing (11) Open the MCB inside the ELC panel box Precaution Operate the guide vane gradually while monitoring the response of the frequency and dummy load current in order for the ELC to function properly Instrument Criteria Tachometer Infrared thermometer Ultrasonic flow meter Clamp on Power HiTester Water resister Dummy load consumes the generator output from which the actual load is excluded Frequency is kept constant without hunting for each value of the actual load viii
23 Test item Guide vane opening vs. output test To verify the generator output by the guide vane opening Purpose Procedure Equipment conditions before testing: (1) Inlet valve: Open (2) Guide vane: Close (3) MCB for the main circuit inside the ELC panel box: Open (4) ON/OFF switch on the ELC panel box: ON Test Procedures: (1) Check the connection of the clamp tester set to the main circuit (2) Open the guide vane gradually to turn over the turbine-generator (3) Open the guide vane to 10% of its full opening capacity (4) Record operation data at each point (5) Close the guide vane after testing Precaution Instrument Tachometer Infrared thermometer Ultrasonic flow meter Clamp on Power HiTester Criteria To understand the relationship between the guide vane opening and the generator output ix
24 Test item Purpose Procedure Precaution Instrument Criteria Load rejection test To verify that the dummy load consumes all the generator output after actual load rejection by normal functioning of the ELC and that the turbine-generator settles at the next equilibrium. Equipment conditions before testing: (1) Inlet valve: Open (2) Guide vane: Close (3) MCB for the main circuit inside the ELC panel box: Open (4) ON/OFF switch on the ELC panel box: ON Test Procedures: (1) Check the connection of the clamp meters set to the main circuit and dummy load circuit (2) Check the connection of the water resister (3) Set the Power Meter to the main circuit to record the transient response after load rejection (4) Close the MCB inside the ELC panel box (5) Open the guide vane gradually to increase the generator output to 25% of the maximum * At this stage, the dummy load consumes all the generator output (6) Increase the actual load to the same as the generator output by inserting electrodes of the water resistor to a water tank * At this stage, the current to the dummy load current becomes zero (7) Record the operation data before load rejection. (8) Open the MCB inside the ELC panel box manually (9) Observe the transient state of the turbine-generator (10) Record the operation data after load rejection (11) Close the guide vane (12) Repeat the above procedures of (4) (11) for 50%, 75%, 100% of the maximum (13) Open the MCB inside the ELC panel box Close the guide vane immediately after a rapid increase of rotational speed occurs subsequent to the opening of the MCB Tachometer Infrared thermometer Ultrasonic flow meter Clamp on Power HiTester Water resister Power Meter After actual load rejection, the dummy load consumes all the generator output and the turbine-generator safely settles at the next equilibrium Rotational speed does not exceed the run-away speed Water pressure does not exceed the tolerance of the penstock pressure Abnormal states are not observed in each part of the turbine-generator x
25 Test item Purpose Parallel-in run test To energize the newly installed distribution lines by connecting to the turbine-generator and verifying the installation conditions Procedure Equipment conditions before testing: (1) Inlet valve: Open (2) Guide vane: Close (3) MCB for the main circuit inside the ELC panel box: Open (4) ON/OFF switch on the ELC panel box: ON Test Procedures: (1) Check the connection of the clamp tester set to the main circuit and dummy load circuit (2) Connect the disconnected distribution lines to the secondary terminal of the MCB after removing the water resister (3) Close the MCB inside the ELC panel box (4) Open the guide vane gradually to its full opening capacity (5) Monitor the operating conditions of the equipment (6) Close the guide vane after testing Precaution Instrument Abnormal conditions are not observed during operation Criteria xi
26 Test item Purpose Load run test To verify that the turbine-generator can operate normally at the rated conditions for a long period of time Procedure Equipment conditions before testing: (1) Inlet valve: Open (2) Guide vane: Close (3) MCB for the main circuit inside the ELC panel box: Open (4) ON/OFF switch on the ELC panel box: ON Test Procedures: (1) Check the connection of the clamp tester set to the main circuit and dummy load circuit (2) Close the MCB inside the ELC panel box (3) Open the guide vane gradually to its full opening capacity (4) Monitor the operating conditions of the equipment and record the data (5) Close the guide vane after testing Precaution Instrument Tachometer Infrared thermometer Ultrasonic flow meter Clamp on Power HiTester Criteria Abnormal sound, odor, vibration and temperature rise are not observed during operation xii
27 Test item Purpose Overnight operation data collection To verify the equipment conditions by recording the operation data overnight which shows the response to actual load fluctuations To acquire the actual load operation data overnight by setting the Power Meter and the AC voltage logger at the power plant and households respectively Procedure Precaution Instrument Power Meter with Clamp AC Voltage Logger Frequency is kept constant during actual load operation Criteria xiii
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