GB/T 13032-1991 General technical requirements for marine diesel generator sets
Some standard content:
JDC 621.$11.8629.12.064
National Standard of the People's Republic of China
GBT13032—91
General specification for marinediesel generator set
Issued on July 15, 1991
Implemented on October 1, 1992
Issued by the State Bureau of Technical Supervision
National Standard of the People's Republic of China
General specification for marinediesel generator set
GB/T13032-91
This standard adopts the relevant provisions of International Standard 318 Generator and Motor and International Standard 3016:197 Engine Performance-Part 4 Transfer Regulation. 1 Subject content and scope of application
This standard specifies the terms, product classification, technical requirements, test methods, inspection specifications, application ranges, etc. for marine generator sets
This standard applies to diesel generator sets for electrical excitation and emergency power supply on ships (hereinafter referred to as units). This standard does not apply to shaft-driven generators, power converters, single-phase transformers and diesel generator sets with power transmission. 2 Reference standards
GB4826 Motor power rating
GF Basic technical requirements for marine motors
3 Terms
3.1 Diesel generator set
An integral unit consisting of a diesel engine, a generator and its speed and voltage regulation system, in which the diesel engine is connected to the generator through elastic parts or a coupling and operates at the same common frequency: a diesel-driven generator set. 3.2 Steady-state speed regulation characteristic curve of the unit
When the unit is under a certain load and rated speed, the speed regulator's adjustment mechanism is fixed. When the load changes back and forth in one direction within the range of no-load to full-load, the speed characteristic curve is formed by the arithmetic mean value. 3.a Shifting speed regulation of the unit
When the machine is set at a certain load and a certain speed, and the load changes from no-load to full load or from full load to no-load, the difference between the stable no-load speed and the rated speed is the percentage of the rated speed, d,
wherein,.
A stable speed adjustment vehicle, %:
The running speed of the fixed air cutting, ", mi,
The fixed speed, r:min.
3.A unit state adjustment rate and stabilization time
3.4.1 The unit state adjustment rate refers to the time when the unit is set to the fixed speed, under the rated load and rated speed, first suddenly unloads, and then suddenly adds the specified symmetrical load. Minimum instantaneous speed...: or the ratio of the maximum speed nmb to the speed before the load change, or to the fixed speed, the benefit, and the relative fixed speed
The transient speed adjustment rate of the unit at the high instantaneous speed is calculated according to formula! 2, approved by the State Technical Supervision Bureau on 1991-0-15
Implementation on 1992-04-01
GB/T130 32-91
The speed regulation rate of the unit at the lowest instantaneous speed is calculated according to formula (3): nmin-n
3.4.2 The stabilization time refers to the time from the time when the speed changes to the time when the speed recovers to the stable speed under the corresponding load within the speed passive range. See Figure 1
Figure Speed transient process
A special time regulation of the speed regulation:
Yan Ding missing seat, day,
Teaching through nx, nn
t, a kidney such as the determination of the speed regulation rate after the load is divided into 1V and the speed regulation rate 3.5 unit speed system insensitive change
GB/T18da2--1
After the unit is set to the steady-state regulation rate, under the specified load and rated speed, the load is adjusted to the idle speed. The maximum product of the speed characteristic curve and the percentage of the rated transfer when the speed characteristic curve is bent in one direction within the full range. See Figure 2. an
Figure 2 Insensitivity of the speed measuring system
3.6 Steady-state insensitivity
The ratio of the maximum speed difference between the steady-state speed regulating characteristic curve and the corresponding no-load and fixed-point connection to the fixed speed trace, that is, the relative speed difference between the connection between the no-load and unload points of the speed regulating characteristic curve and the line parallel to the steady-state speed regulating characteristic curve. P
Figure 3 Insensitivity of the speed characteristic
3.7 Speed fluctuation ratio
When the unit is running at any load within the range of no-load to full load. The difference between the recorded high speed or low speed measured within a certain time interval and their half-mean values The percentage of the difference to the average speed. Where: "
GHFE13032-91
Speed fluctuation,
"Average speed, life-L+23
nHigh speed, r/min;
Low speed, r! min.
3. After the unit is adjusted to the steady-state speed regulation characteristics, under the constant load and rated speed, the magnetic field protection system setting remains unchanged, the negative load and reactive power function maintain the set value, in the one-way change loop from no-load to full-load range, the normal or minimum voltage and the rated voltage are the percentage of the rated voltage:
Where:
Steady-state voltage regulation, "61
General high or minimum voltage, Y:
Standard voltage, V.
3.9 The voltage change rate and the set time m
are the standard group under the set steady-state rate, the voltage adjustment rate, the no-load sudden change width is 0. : After) and the specified load, the lowest or commercial fault voltage u, and the voltage before the load change", the difference between the rated voltage and the positive voltage is the percentage of the rated voltage: 4#
Wu Zhong: Au
Withstand voltage connection rate, research,
The most sensitive commercial voltage version,
The voltage before the negative voltage is cut off, V
Stable time refers to the time from the voltage change to the voltage discharge to the deviation from the set value within ±3% of the rated voltage. 3.10 Voltage fluctuation rate||t t||The unit is running at any load within the range of no-load to full load when the set speed characteristic is set. The highest voltage or the lowest peak cutoff voltage is measured within a certain interval. The difference between their average values is the percentage of the average voltage. u.-vm.
Where:
voltage fluctuation rate,
yaverage voltage,
high voltage zone,
lowest voltage,.
3.11 Load sharing difference
The first generator in parallel operation The difference between the actual load rate of the generator set and the total average load rate. ap,-
The formula shows that the active load mismatch is ap,;>
GB,T13032-91
Reactive load mismatch is ap,;
The actual active work done by the ith unit, kw,
The actual reactive power of the ith unit, kvar: The total actual active power of the parallel running units, kvar, The total actual reactive power of the parallel running units, kvar: The rated power of the first unit Active power, W,
Rated reactive power of the first unit,
Total rated active power of the units in parallel operation, kW; Total rated reactive power of the units in parallel operation, hvar1 Classification of generator sets
4.1 Types of machines, types and specifications
1.1 Types of current, AC, DC.
4.1.2 Rated current, DC 115V, 236V.460V, 804V33 AC 50Hz: 39AV. 410V, 604V!:
690 V, 3 150 V, 6 300 V
60Hz* 450V.3150V.6300 V
Note, 1: Only for Shichuotaichuan.
2 Only for Yamaguchi products.
4.1.8 Rated frequency: 0Hz, 60Hz
Note: 3) Only for export products:
4.1.4 Rated power internal number, 1.8 lag! . 4.1.5 Rated power:
12, 26, 24, 30, 0.5, 61, 75, 93+12U, 150, 200, 250, 28V.315, 35, t03.53506)0809012012460022).2
(2B00),815G,(600),490kW
Note: The above power generation technology and the rated power of the generator are determined in the environment. The power after matching with the generator under the specified conditions is generally the same as the above. The values in brackets are not recommended.
4.F. Rated speed, see Table 1.
Plate rated speed, T/2
4.1.7 Working system: continuous.
4.1.8 Unit starting mode: electric starter or air starter Fo
, 2 units are divided into basic type and self-service type, and the acoustic type unit must not only meet the numerical requirements of the basic type unit, but also meet the relevant regulations of the automatic power station for the unit.
4.3 Unit code representation method
CCFxx x
4 Unit code example
GB/T 13032-91
" Variant code
Engine applicable navigation area code
Unlimited navigation area with W, limited navigation area with Y Unit upgrade code
Basic type with %, automatic type with Y, emergency type with Y
Unit rated power code
Expressed in kw
Electric type code
AC with %, true current with %
Marine diesel generator set code:
Power 250kw, applicable to unlimited navigation area Automatic diesel generator set: CCFI25ZW
Power 24k, applicable to limited navigation area Basic type true current diesel generator set: CCFZ 24J-Y
Power rating, suitable for marine diesel generator sets without distress: CCFJ90Y-WB
5 Technical requirements
ST Working parts
5.1.1 The unit can work normally under the following conditions. Ambient temperaturewwW.bzxz.Net
Seawater temperature
22"30" (emergency unit, inland ship 7\30',
1 (emergency unit, inland ship)
2230°;
Drop air, salt (except inland ship), oil and each idle, normal operation and shock. 5.1.2 The unit should be able to output rated power under the following working conditions, unlimited area machine ideal: ambient temperature, primary cooling water temperature 32℃, relative warranty age%.a.|| tt||b, units in limited navigation area and corresponding conditions: environmental humidity 40, secondary cooling water filtration 25, relative strength 0.
5. The diesel engine and generator are connected elastically or rigidly and installed on the same common surface. After center alignment, positioning pins should be added. The concentricity and parallelism of the half coupling are specified in the product technical specifications. The installation and fixation of the unit should use shock absorbers and have good vibration resistance. The equivalent vibration intensity during the continuous bench test should not exceed T45mm with isolation, and should not exceed s without vibration isolation. 28mm/s5,3 Starting performance
GB/13D32-9T
The unit should be able to start smoothly at room temperature not less than 5Y without preheating (when the machine uses forced lubrication of sliding bearings, the lubrication system is allowed to use preheating). Emergency units should be able to start at room temperature D (when starting is difficult, the total culvert water preheating measures can be considered) 5.4 Flow generator set voltage regulation performance
The fan generator set has the corresponding shifting state adjustment characteristics, and it is transferred to the rated value at full load and evenly hot operation When running, starting with 20% rated load, the voltage deviates from the rated voltage within 1% of the rated value, and the full-power deviation is less than 0.5%. The average voltage regulation curve when the load rises and falls between % rated load and full load should not exceed 1% of the rated voltage: 5.5 AC generator set voltage regulation performance
5.5.1 Voltage adjustment requirements
The steady-state voltage regulation rate of the AC generator set should not exceed +2.5%, and the steady-state voltage regulation rate of the generator set is allowed to not exceed ± 3.556-
5.5.2 Transient voltage change rate and stabilization time When the AC generator set is under no-load operation, the transient voltage change rate shall not exceed 15% at the lowest and 20% at the highest. The voltage shall not exceed 3% of the rated voltage within 1.55 seconds. 5.5.3 The setting range of the unit's no-load voltage is 96% to 105% of the rated voltage. 5.5.4 When the unit is under 0-1% U% rated voltage Under symmetrical load at any point within the rated load, the voltage fluctuation rate should not exceed ±1%. 5.6 The excitation and protection system of the AC generator sets running in parallel should have measures to properly distribute the reactive power between the units. 5. Overload
The unit should have the ability to withstand 11% of the rated power (the power factor of the AC unit is the rated power) for continuous operation, and no assessment will be made if it is turned off.
5.B Two-phase sudden frequency circuit and short circuit
Under self-excitation, the unit can withstand a sudden short circuit of one phase for a duration of not less than 2 seconds without damage or deformation. Under the condition of full short circuit, the generator and its excitation and protection system should be able to maintain a steady-state short-circuit current of at least three rated currents. 5.9 Unit speed regulation
5.9.1 Transient response rate
When the unit is suddenly loaded with a rated load of 1% under unloaded rated load and no load, and then the remaining 1% is added after stabilization, its transient response rate should not exceed 10%, and the rated time should not be greater than 10%. The unit should be able to suddenly unload or add 100% rated load, and its instantaneous speed and total timing are the same as above.
5.9.2 The steady-state speed regulation rate of the running speed regulator should not exceed 5 times. 5.9.3 Speed fluctuation rate
The speed fluctuation of the unit under the setting characteristics should not exceed 1% under various loads. 5.9,4 The insensitivity of the speed regulation system should not exceed 0.5%. 5.9.5 The speed characteristics of the units running in parallel should also be consistent, and the nonlinearity of the isotropic curve should not exceed 1%. 2% is the actual standard setting value of the steady-state speed regulation rate.
5.9.6 The speed regulator of the units running in parallel should have an adjustable mechanism to change the steady-state speed regulation rate so that its total speed regulation rate can be adjusted to the full value.
5.10 Parallel operation
5.1B.1 Parallel operation of DC generators
DC units operating in parallel shall operate stably under all loads from no-load to full-load. When the load varies within the range of 21% of the total rated power, the power distribution difference shall not be greater than 12% of the rated power of the largest generator and 25% of the rated reactive power of the smaller generator.
5.10.2 Parallel operation of AC generator sets GB/1303291
AC units operating in parallel shall operate stably under all loads from no-load to full-load. When the load varies within the range of 21% of the total rated power, the active power distribution difference shall not be greater than 15% of the rated power of the largest generator and 25% of the rated reactive power of the smaller generator. The reactive power distribution difference shall not be greater than 0.3% of the rated reactive power of the largest generator and 25% of the rated reactive power of the smaller generator. :. 5.11 Overspeed protection device
The unit with a prime mover power greater than 220kW (33uPS) should be equipped with an overspeed protection device to prevent the engine speed from exceeding the rated speed by 15\.
5.12 Overspeed control mechanism
In order to adapt to the frequency adjustment and load transfer during automatic control and self-control, the unit should be equipped with an overspeed control mechanism, and its speed adjustment range should be at least -20~+10 of the rated speed. The sensitivity of the speed adjustment should be within the rated speed range of 0.5-1.5 per second. The control should also be equipped with a protective device for the clutch and speed control handle to reach the point of the control and control. 5.13 Torsional vibration of the unit
For the unit with a prime mover power greater than 11UkW (15PS), the torsional vibration calculation and measurement should be carried out. If one of them is different, the actual measurement shall prevail.
5.18.1 The allowable bending stress and rotating shaft torque of the unit shall not exceed the integral value calculated by the formula (-1) and formula (12). When the unit is continuously operated within the rated speed range of Ⅱ~95. +r 1 - ± 121.59-,013 2d)
When the unit is continuously operated within the rated speed range of Ⅱ~95.: Cr1:+5.51:
Formula (), Formula [) Where:
Continuous operation torque allowable stress, MPa,
Understanding the allowable stress of the operating torque, MPa;
d—the actual diameter of the shaft. mm
5.13.2 The above-mentioned allowable stress value is applicable to steel crankshafts with a rated tensile strength of more than MPa. When the selected rated strength is higher than 3MPa, the allowable stress can be calculated by formula (13): b+18
Where: a, —
minimum tensile strength of the shaft, MP
5.13.1F is the calculated allowable stress, MI. 5.13.# The vibration torque applied to the generator rotor shall not exceed 2M㎡ (M is the rated speed) when the speed is within the range of 5%-10% of the rated speed. When the speed is lower than 95% of the rated speed, it shall not exceed ±6Mm5.13.4 Under rated working conditions, the amplitude of the vibration at the rotor of the alternating current generator shall not be less than .5 degrees. 5.13.5 When the unit adopts elastic coupling, the gripping torque of the coupling's filter element in continuous operation shall not exceed its allowable alternating torque value, and in decelerated operation, it shall not exceed its allowable alternating torque value of instantaneous operation. 6.14 When the unit speed is 90~115% of the rated speed, the critical speed range and its operating area of 2/2 and Z times (Z is the number of diesel engine cylinders) shall not be generated. In the rated speed range of 10~10G%, the speed restriction zone shall be eliminated as much as possible by reducing the amplitude. 6.15 When the unit's rated speed is lower than or equal to 1000r/min, the sound shall not exceed 105dB, and when the unit's rated speed is higher than 1000r/min, the sound shall not exceed 1. 5.16 The cold-state insulation resistance of the generator winding shall not exceed 5M2, and the hot-state insulation resistance shall not be less than 2M. 5.17 The fuel consumption rate of the reactor is stipulated in the annual product technical conditions. 5.18 Maintenance requirements
5.18.1 The layout of the components and accessories of the type XEAN unit should be easy to maintain and replace. The process should be simple and the operation should be small.
GB/'T13032--91
6.18.2 The structure of the oil-fired reactor should ensure the possibility of its installation on the shock absorber. 5.16.3
The reverse moving parts that may be touched by the diesel and generator sets during operation. Pay attention to the protection device. The temperature tolerance of the fuel-fired generator set that may be touched by the operator is about the table of the special person. The expansion prevention measures should be added. 5.18.4
Equipment.
The station cleaning of the oil generator should be carried out to prevent fuel and oil from falling onto the exhaust pipe and electrical devices and into the intake system. 5.19 The service life of the oil generator from maintenance to overhaul should be specified in the product technical specifications. 5.19.15
5.19.2 The allowable operating time and calculated operating time of the oil generator under low load should be specified in the product manual. 5.93 The allowable working time of the oil generator should not exceed: 6 Test method
8.1 Test equipment
6.1.1 The accuracy of electrical equipment such as ammeter, voltmeter, power meter, rated power meter, etc. should not be less than 0. The accuracy of the power multiplication factor meter should not be less than 6.1.2 The accuracy of the temperature reduction meter, H-pressure meter and other protective parameter measuring instruments should not be less than Class 3.3. When the unit leaves the factory, the meter beside the machine shall be used for charging and discharging. 6.1,3 The accuracy of the instrument shall not be less than .5 level. 8.1.4 Load-discharging equipment
a, when the active load is a water resistor, the minimum balance degree of the current of the phase is less than 3", and the rated current of the generator is less than 3". b, when the induction regulator is used as a dynamic load, it works in the non-inquiry area. The dynamic load can be a locked asynchronous motor variable water resistor reactor, and the induction regulator is used as a reactive load when there is no condition.
d. When the unit load is transmitted, it is allowed to use the form of electric energy feedback to the grid. This form cannot be used when the speed regulation and pressure avoidance characteristics of the unit are made. 1.5 The instruments and meters used in the test, such as oscilloscopes, have regular control and verification. 6.1.5 Xie bone only shows the process, and the effectiveness should be verified according to the possible large-scale enterprise standard. Use the test instrument in the range of 2: %% 6.2 External inspection of the machine
Before commissioning, the common seat, coupling connection, and installation quality of each component of the machine should be checked, and the installation of the shaft system of the unit should be checked; check whether the transmission is in the specified position and the parking manual is flexible; check the fuel level and fuel level; eliminate the air in the oil system, check whether the accessories, pipelines, and electrical circuits are connected properly: whether the pipelines are lubricated or leaking; whether the starting system is normal (whether the fresh air of the engine is in the specified recommended or normal standard, etc.), and whether each component is in the starting state.
6.a Generator insulation transformer
Before the machine is connected, check whether the insulation type of the generator set is within the specified range after shutdown. The insulation tester used The voltage level of the test instrument is as shown in Table 3.
Specified power of the generator, V
3000-6300
Insulation test instrument receiving E level,
6.4 Unit test run inspection
GB/T13032—91
When the unit has been visually inspected and the insulation resistance has been checked, if it is considered that the unit is in normal condition, the diesel engine can be started according to the procedures specified in the diesel engine manual, and gradually increased to a certain speed, and the engine is observed to have no abnormal sound, whether the parameters are within the specified range, whether there is oil leakage, water shortage, whether the generator voltage can be started, and the following are correct and adjustable. 6.5 Machine material test
The unit using couplings should be tested with a longitudinal tilt cavity. During the test, the unit The installation is carried out on a test bench with a certain lateral inclination, in two conditions, forward and backward, and under rated working conditions, each running for 1 hour. The operation should be smooth without any abnormal gear movement, continuous impact and noise of the shaft, and no lubricating oil loss. 6.B Unit starting performance test
The unit should be able to start smoothly under the condition of an ambient temperature not lower than 5, cooling water, and no preheating of lubricating oil. Under the condition of an ambient humidity of 5 (preheating measures are allowed if starting is difficult), the unit should be able to start six times in a row, and more than five successful starts in a total of starts are qualified. The time interval between each start is required to be more than 1min. The determination of the starting time,
During the type test, the starting time is measured and recorded by the slope: after the transfer signal is sent to the instantaneous transfer measuring instrument, it is sent to the filter for filming. During the test, the starting time shall be recorded by a table, which is the algebraic sum of the starting time for each time divided by the number of starting times. The total time from the unit starting to the no-load speed shall not be less than s. 6.7 The steady-state speed regulation of the unit can be checked by setting the steady-state speed regulating knob on the speed regulator to the desired position. The unit is loaded with rated load and the speed is set to rated load. Subtract the partial load and record the no-load speed or speed of the unit at this time. Set the two steady-state speed regulating knobs on the speed regulating knob to the maximum position, repeat the above test, and respectively find the minimum and maximum values of the steady-state speed regulation of the unit. .8 Determination of unit steady state characteristics
Unit steady state speed, "maximum adjustment within the range of 3%-5%, so that the unit with a fixed active power, turn to the fixed speed, adjust the speed handle, the unit from 100% to 0% of the rated load, and then from 0%-100% of the rated load, slowly release the load in one direction (it is not allowed to adjust the load under one load condition, and the measuring points in the larger or smaller direction should be no less than five points), measure the total fixed speed or frequency and the corresponding unit power after the load change, the test is carried out three times in a row (factory \ During the test, it is allowed to measure 100-20 times). When the characteristics of each time are basically stable, the average characteristic curve of each loop is used to calculate the insensitivity of the speed regulation system and the nonlinearity of the speed regulation characteristics. The speed regulation rate is stable.
6. Speed fluctuation determination of the unit
At rated speed, use an indicator (speed measuring instrument) to record the speed change of the unit at 100%, 75%, 50%, 20% of the rated load and no load. Each working condition is stabilized for 1-2 minutes. It is allowed to use a power meter for measurement during factory test. 6.1D Determination of instantaneous speed regulation and stabilization time of the unit The unit is operated for 5-10 minutes under rated active load conditions, unload all loads, and then add 50% of the rated load first. After stabilization, suddenly increase the rated load. Use an indicator (speed measuring instrument) or other effective test methods to record the speed change and stabilization time.
This test should be repeated three times continuously (one state is stabilized and then another sudden load test is carried out), and the half-average of the three times is collected as the test result.
The recording instrument records the stable speed (frequency) of the unit before and after sudden load addition and unloading. 6.11 Check the voltage setting diagram of the unit. When the unit rises to the rated speed, the generator should be able to start. Adjust the voltage setting potentiometer to observe whether the voltage changes within 95%~[05% of the rated voltage.
6.12 Determination of steady-state voltage of the unit
The unit is operated at rated power and rated speed in the hot state. After unloading, the unit load is changed from no load to 100% rated load, and then from 1% rated load to no load, maintaining the power factor (with lag), and changes slowly in one direction. Measure no less than five points in each direction, including 20 rated loads, and record the load, current, voltage, and power value of each point. 10
6.12 Passive determination of machine voltage
GB/19032-91
Under the condition of rated power factor, record the voltage fluctuation with a liquid indicator for 20%, 50%, 75%, 100% rated load. During the test, measure with a voltmeter: .14 Determination of the unit's voltage change rate and recovery time. After the unit's load is measured, remove the load, and the unit is suddenly unloaded symmetrically after emptying and adding % rated current. The power factor is low (with)
Use an oscilloscope to record the changes of the two-phase line voltage and one-phase current. Repeat three times and take the average value of each change as the test result.
日.16 Unit Noise Measurement
The unit is at rated speed, after load, and its noise is measured under reduced pressure, 1U0% rated load and air cut. The test can be carried out in accordance with the load test.
The measurement can be carried out in a noise test laboratory or a communication test laboratory that meets the requirements of GB1859, using A weighting. The noise level of the unit should be lower than the maximum noise level and not affected by other noise sources. The distance of the measuring point should be flush with the cylinder head and 1m away from the unit body, and the distance from the diesel engine supercharger and generator exhaust port should be 1m. Each measuring point should be measured twice, and the difference between each measurement should not exceed 2B. Record the ambient temperature, humidity, atmospheric pressure, date, noise level 1,1 (A) and display noise level of the measuring point. B.16 Unit torque measurement
Under no-load condition, measure the torsion amplitude and stress (or torque, angle) of the unit in the range of the lowest rated speed to 110% of the rated speed. Under rated condition, measure the torsion amplitude and stress (or torque, angle) of the unit in the range of 1% to 1% of the rated speed. 6.17 Unit load test Under the set speed and power rating (after), the unit is operated at no-load for 5 minutes. After running at 25, 50, and 75% of the rated load for 19 minutes respectively, the load is added to the rated power and the unit is continuously operated for not less than 4 hours at the rated value. Record the machine speed every half an hour. The power, frequency, voltage and fuel consumption of the unit. The unit oil consumption balance is measured at an ambient temperature of 15°C, a relative humidity of 60%, a seawater temperature of 32°C, and a secondary pressure of 1n1.3kPa. The fuel consumption per thousand hours at rated power is measured. Static calibration should be performed when this condition is not met. The weight of the given fuel is based on the diesel engine factory's custom and equipment conditions. The fuel consumption time is measured with a stopwatch (speed level 1s). 6.19 Unit overload test After the unit load test, a rated load test of 110° is immediately carried out. The test time is one hour. 6.20 Unit overspeed protection test |The unit is under no-load conditions, and the speed cut-off protection device is set to the setting value, so that the oil engine speed reaches 113%-115>% of the rated speed. The speed protection device should act quickly to stop the oil engine, and the test should be successful three times. 6.21 The unit's three-phase sudden ignition short-circuit test and the measurement of the reverse short-circuit current test should carefully check the installation quality of the motor and whether the generator excitation control circuit is in good condition. At the same time, the simultaneity of the closing of the switch contacts must also be checked. It is required that the two-phase contacts should be able to close at the same time, and the maximum error should not exceed 15" electrical angle. The instantaneous tripping current of the operating switch must be greater than the maximum short-circuit current. All reverse circuits must be reliable and there is no motor The wiring of the full switch uses a three-core cable, the length of which should not exceed 6 meters, and the electric density of the cable under the rated voltage should not be higher than its rated value. The test temperature should be close to the hot state, the unit is switched to a new rated speed, and the generator set is unloaded from the rated operating condition to the no-load state: a three-phase sudden short-circuit test is carried out for 25 seconds. A photosensitive shunt should be used to measure the short-circuit voltage. An oscilloscope should be used to photograph the voltage, phase current and excitation current. The three-phase single-state short-circuit current should be measured from the oscilloscope.
After the test, the short-circuit state should be eliminated immediately, and the various parts of the unit should be checked for damage and deformation. After the short circuit is eliminated, the unit can still operate.
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