DL/T 2023-2019Field test code of SFC-based starting system for gas turbine generator unit (English PDF)

4.1 Test items and cycle

The field test includes handover test and regular test. For specific test items, see Table 1 and Table 2.The period of regular test is generally 1 to 3 years.

4.2 Test preparation

4.2.1 Before the test, a test program shall be formulated in accordance with the unit's infrastructure or maintenance plan. The test program shall include the test purpose, test basis, and test strips.

Parts, test items, test procedures, precautions, safety measures, time plan and organizational measures.

4.2.2 Prior to the test, each participating unit of the test shall refine the safety measures and prepare a safety isolation and emergency plan.

4.3 Test standards

The equipment handover test of the static frequency conversion starting system shall be carried out according to GB 50150 covered by GB 50150.

5.1 Insulation resistance test

The insulation resistance test requirements are as follows.

a) Test conditions. The surface of the tested equipment should be clean and tidy, and the electrical circuit wiring of each equipment of the static frequency conversion starting system should be correct.

b) Test method. Choose an insulation resistance tester suitable for the test voltage, see Table 3 for the test voltage.

c) According to DL/T 596, the test criteria are shown in Table 3.

5.2 DC resistance test

The DC resistance test requirements are as follows.

a) Test conditions. The surface of the tested equipment should be clean and tidy, and the electrical circuit wiring of each equipment of the static frequency conversion starting system should be correct.

b) Test method. Choose a suitable DC resistance tester.

c) According to DL/T 596, the test criteria are shown in Table 4.

5.3 Network bridge and machine bridge test

5.3.1 Overvoltage protection test

The requirements for the overvoltage protection test are as follows.

a) Test conditions. the static frequency conversion starting equipment has been correctly installed and passed the acceptance, disconnect the thyristor overvoltage protection device and the static frequency conversion Start the connection of the equipment and prepare for the test wave recording.

b) Test method. Apply test voltage in parallel on both sides of the thyristor overvoltage protection device, gradually increase the test voltage until the device operates, Test voltage curve at the moment of operation of the measuring device.

c) Test criterion. the deviation of the operating voltage from the design value does not exceed 10% of the design value.

5.3.2 Small current test of bridge

The requirements of the bridge low current test are as follows.

a) Test conditions. The static frequency conversion starting equipment has been correctly installed and passed the acceptance test, disconnect the bridge and the isolation transformer, disconnect the network Bridge and machine bridge connection.

b) Test method. Connect the three-phase voltage suitable for the test through a three-phase air circuit breaker at the input end of the network bridge, and connect an appropriate for resistive load, use an oscilloscope to observe the bridge output waveform. Start the static frequency conversion start system, gradually change the trigger angle, remember Record the corresponding output DC voltage value. The output DC voltage can be calculated according to the following formula.

5.4 Functional test of cooling device

The functional test requirements of the cooling device are as follows.

a) Test conditions. The static frequency conversion starting equipment has been correctly installed and passed the acceptance.

b) Test method. Start the cooling device, check the auxiliary contacts and rotation direction of the cooling fan or cooling water pump.

c) Test criterion. the state feedback of the auxiliary contact of the cooling fan or cooling water pump, the rotation direction of the cooling fan or cooling water pump is correct, the electric the machine is normal.

5.5 Static inverter control and protection unit test

5.5.1 Signal circuit transmission test

The signal circuit transmission test requirements are as follows.

a) Test conditions. The static frequency conversion starting system has been powered on, there is no abnormal alarm, there is no error in the related wiring, and the switching elements are in an open state.

b) Test method. All operation, protection, limitation and signal circuits of the static frequency conversion starting system are tested according to the design logic.

check.

c) Test criteria. to ensure compliance with design logic and supply requirements.

5.5.2 Analog unit test

The test requirements for analog units are as follows.

a) Test conditions. The static frequency conversion starting system has been powered on and there is no abnormal alarm. Three-phase AC voltage source (output 0V~150V, 10Hz~55Hz, the error is not more than ±0.5%), three-phase AC current source (output 0V~10A, 10Hz~55Hz, the error is not big Within ±0.5%). Connect the three-phase AC voltage source and current source to the static frequency conversion starting equipment to simulate the grid-side voltage, grid-side current, Machine side voltage, machine side current.

b) Test method.

1) Grid side voltage. change the output value of the input voltage source within the range of 0~120% of the rated voltage, set 5~10 test points, and record Record the displayed value of the static frequency conversion starting system, the deviation is less than 0.5%;

2) Grid side current. change the output value of the input current source within the range of 0~120% of the rated starting current, set 5~10 test points, Record the display value of the static frequency conversion starting system, the deviation is less than 0.5%;

3) Machine side voltage. change the output value of the input voltage source within the range of 0~120% of the rated voltage, set 5~10 test points, and record Record the display value of the static frequency conversion starting system, the deviation is less than 0.5%; the voltage remains at the rated value, in the range of 10Hz~50Hz Change the input voltage frequency within the enclosure, set 5~10 test points, record the display value of the static frequency conversion starting system, the voltage frequency Deviation is less than 0.1Hz;

4) Machine side current. Change the output value of the input current source within the range of 0~120% of the rated starting current, set 5~10 test points, Record the display value of the static frequency conversion starting system, the deviation is less than 0.5%; the current keeps the rated starting value unchanged, at 10Hz~50Hz Change the input current frequency within the range, set 5~10 test points, record the display value of the static frequency conversion starting system, the current frequency the rate deviation is less than 0.1 Hz.

c) Test criteria. grid-side voltage amplitude deviation is less than 0.5%; grid-side current amplitude deviation is less than 0.5%; machine-side voltage amplitude deviation is small the frequency deviation is less than 0.5%, and the frequency deviation is less than 0.1 Hz; the machine-side current amplitude deviation is less than 0.5%, and the frequency deviation is less than 0.1 Hz.

5.5.3 Switch unit test

The test requirements of the switch unit are as follows.

a) Test conditions. The static frequency conversion starting system has been powered on and there is no abnormal alarm.

b) Test method. Check the input and output signals of the static frequency conversion starting system one by one through the static frequency conversion system screen display or board instructions.

c) Test criterion. The signal of the switch unit meets the design requirements.

5.5.4 Protection function test

5.5.4.1 Overcurrent protection test on the bridge side

The requirements for the bridge side overcurrent protection test are as follows.

a) Test conditions. The static frequency conversion starting system has been powered on and there is no abnormal alarm. Three-phase AC current source (output 0V~10A, no error Greater than ±0.5%).

b) Test method.

1) At the bridge side current sampling input terminal of the static inverter control and protection unit, the bridge side current at the time of simulation start is passed, which is larger Corresponds to 1.05 times of the fixed value of overcurrent protection on the bridge side, so that the overcurrent protection on the bridge side is activated, and the corresponding protection action is recorded.

Make time.

2) At the bridge side current sampling input terminal of the static inverter control and protection unit, the bridge side current at the time of simulation start is passed, which is larger Corresponding to 0.95 times of the fixed value of the bridge-side over-current protection, the bridge-side over-current protection should not operate.

c) Test criterion. The action value and action time are consistent with the settings, and the overcurrent protection action signal on the bridge side is correctly issued.

5.5.4.2 Overvoltage protection test on the bridge side

The requirements for the bridge side overvoltage protection test are as follows.

a) Test conditions. The static frequency conversion starting system has been powered on and there is no abnormal alarm. Three-phase AC voltage source (output 0V~150V, error not more than ±0.5%).

b) Test method.

1) The bridge-side voltage sampling input terminal of the static inverter control and protection unit is connected to the bridge-side voltage at the time of analog start, which is greater than Corresponds to 1.05 times of the fixed value of overvoltage protection on the bridge side, so that the overvoltage protection on the bridge side is activated, and the corresponding protection action is recorded.

Make time.

2) The bridge-side voltage sampling input terminal of the static inverter control and protection unit is connected to the bridge-side voltage at the time of simulation start, which is greater than Corresponding to 0.95 times of the fixed value of overvoltage protection on the bridge side, the overvoltage protection on the bridge side should not operate.

c) Test criterion. the action value and action time are consistent with the settings, and the overvoltage protection action signal on the bridge side is correctly issued.

5.5.4.3 Low voltage protection test on the bridge side

The requirements for the low-voltage protection test on the bridge side are as follows.

a) Test conditions. The static frequency conversion starting system has been powered on and there is no abnormal alarm. Three-phase AC voltage source (output 0V~150V, error not more than ±0.5%).

b) Test method.

1) The bridge-side voltage sampling input terminal of the static inverter control and protection unit is connected to the bridge-side voltage at the time of analog start, which is greater than Corresponds to 0.95 times of the fixed value of the low-voltage protection on the bridge side, enabling the low-voltage protection on the bridge side to act, and record the corresponding protection action Make time.

2) The bridge-side voltage sampling input terminal of the static inverter control and protection unit is connected to the bridge-side voltage at the time of simulation start, which is greater than Corresponds to 1.05 times of the fixed value of the low-voltage protection on the bridge side, and the low-voltage protection on the bridge side should not operate.

c) Test criteria. the action value and action time are consistent with the settings, and the low-voltage protection action signal on the bridge side is correctly issued.

5.5.4.4 Engine bridge side overcurrent protection test

The requirements for the over-current protection test on the bridge side are as follows.

a) Test conditions. The static frequency conversion starting system has been powered on and there is no abnormal alarm. Three-phase AC current source (output 0V~10A, no error Greater than ±0.5%).

b) Test method.

1) At the bridge side current sampling input terminal of the static inverter control and protection unit, the bridge side current at the time of simulation start is passed, which is larger Corresponds to 1.05 times of the fixed value of overcurrent protection on the bridge side, so that the overcurrent protection on the bridge side is activated, and the corresponding protection action is recorded.

Make time.

2) The bridge-side current sampling input terminal of the static inverter control and protection unit is connected to the bridge-side current at the time of simulation start, which is larger Corresponding to 0.95 times of the fixed value of over-current protection on the bridge side, the over-current protection on the bridge side should not operate.

c) Test criterion. the action value and action time are consistent with the settings, and the overcurrent protection action signal on the bridge side is correctly issued.

5.5.4.5 Overvoltage protection test on the bridge side

The requirements for the overvoltage protection test on the bridge side are as follows.

a) Test conditions. The static frequency conversion starting system has been powered on and there is no abnormal alarm. Three-phase AC voltage source (output 0V~150V, 10Hz~55Hz, the error is not more than ±0.5%).

b) Test method.

1) The bridge-side voltage sampling input terminal of the static inverter control and protection unit is connected to the bridge-side voltage at the time of analog start.

Corresponds to 1.05 times of the fixed value of overvoltage protection on the bridge side, so that the overvoltage protection on the bridge side is activated, and the corresponding protection action is recorded.

Make time.

2) The bridge-side voltage sampling input terminal of the static inverter control and protection unit is connected to the bridge-side voltage at the time of analog start, which is larger Corresponds to 0.95 times of the fixed value of overvoltage protection on the bridge side, and the bridge overvoltage protection should not operate.

c) Test criterion. The action value and action time are consistent with the settings, and the overvoltage protection action signal on the bridge side is correctly issued.

5.5.4.6 V/Hz protection test on the bridge side

V/Hz protection test requirements on the bridge side are as follows.

a) Test conditions. The static frequency conversion starting system has been powered on and there is no abnormal alarm. Three-phase AC voltage source (output 0V~150V, 10Hz~55Hz, the error is not more than ±0.5%).

b) Test method.

1) At the bridge side voltage sampling input terminal of the static inverter control and protection unit, the bridge side voltage at the time of analog start is passed, and its frequency Choose 3~6 points randomly between 10Hz and 50Hz, so that the ratio of voltage and frequency corresponds to the V/Hz protection setting on the bridge side.

1.05 times the value, the V/Hz protection on the bridge side is activated, and the corresponding protection action time is recorded.

2) The bridge side voltage sampling input terminal of the static inverter control and protection unit is connected to the bridge side voltage at the time of simulation start, and its frequency Choose 3~6 points randomly between 10Hz and 50Hz, so that the ratio of voltage and frequency corresponds to the V/Hz protection setting on the bridge side.

When the value is 0.95 times, the V/Hz protection on the bridge side should not operate.

c) Test criterion. The action value and action time are consistent with the settings, and the V/Hz protection action signal on the bridge side is correctly issued.

5.5.5 Communication interface test test

The test requirements of the communication interface are as follows.

a) Test conditions. The static frequency conversion starting system has been powered on and there is no abnormal alarm. The static frequency conversion starting system and the gas turbine control system the communication line has been connected, and the gas turbine control system has been configured according to the point table provided by the static frequency conversion starting system.

b) Test method. modify the signal status one by one on the static frequency conversion starting system and the gas turbine control system side, and check the corresponding side Signal changes.

c) Test criterion. The signal changes corresponding to the gas turbine control system and the static frequency conversion starting system are consistent.

6.1 General test conditions

The general test conditions are as follows.

a) The static test of the static frequency conversion starting system has been completed and qualified.

b) The static variable frequency start system has been powered on and there is no abnormal alarm.

c) The input circuit breaker is in the open position, and the diverter switch and the output isolating switch are in the open position.

d) The static debugging of the excitation system has been completed and qualified.

e) The excitation system is powered on and there is no abnormal alarm.

f) The three-phase phase sequence of the low-voltage side voltage of the isolation transformer has been verified by the nuclear phase test.

6.2 Rotor flow test

The requirements for the rotor flow test are as follows.

a) Test conditions. The output isolating switch is in position, the input circuit breaker is closed, and the de-excitation switch is closed.

b) Test method.

1) Check to confirm that the current set value of the excitation system of the unit is 0, and start the excitation system.

2) Start the static frequency conversion starting system. The excitation current given by the static variable frequency start system does not exceed the no-load rated excitation current, the flow time is not more than 10 seconds, record the excitation current rising curve, and record the excitation current displayed by the static frequency conversion starting system value.

c) Test criterion. The deviation of the excitation current displayed by the unit excitation system and the static variable frequency start system should not exceed 1%. Static variable frequency start the deviation between the system display value and the given value does not exceed 5%.

6.3 Inspection test for the consistency of the initial position of the rotor

The test requirements for the consistency of the initial rotor position are as follows.

a) Test conditions. The generator rotor is in a static state, the output isolating switch is in position, the input circuit breaker is closed, and the de-excitation switch is closed.

b) Test method. Check that the current set value of the excitation system of the unit is 0, and start the excitation system. Start the static frequency conversion start system, the excitation current given by the static variable frequency starting system does not exceed the no-load rated excitation current, and the flow time does not exceed 10s. Record still the rotor position angle displayed by the frequency conversion starting system. The test was repeated 3 times.

c) Test criterion. the initial position angle deviation of the rotor obtained from three tests is not more than 5 degrees.

6.4 Stator flow test

The stator flow test requirements are as follows.

a) Test conditions. Input the circuit breaker in the closed position and the de-excitation switch in the open position. Combine generator stator voltage, generator stator current, network bridge the side voltage and bridge side current are connected to the recorder to temporarily reduce the setting value of the bridge and machine bridge protection functions, and the output isolation switch is in the closing position Set.

b) Test method. Start the static frequency conversion starting system. Set the output frequency on the bridge side according to the set frequency, and gradually increase the bridge side current to Target value, generally not more than 10% of rated starting current, record generator stator voltage, generator stator current, grid current, Grid side voltage.

c) Test criterion. the generator stator three-phase cu...