CN112083231A - Generator stator core loss test device capable of reducing switching-on impact current - Google Patents
Generator stator core loss test device capable of reducing switching-on impact current Download PDFInfo
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- CN112083231A CN112083231A CN202010850285.3A CN202010850285A CN112083231A CN 112083231 A CN112083231 A CN 112083231A CN 202010850285 A CN202010850285 A CN 202010850285A CN 112083231 A CN112083231 A CN 112083231A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
- G01R27/2688—Measuring quality factor or dielectric loss, e.g. loss angle, or power factor
- G01R27/2694—Measuring dielectric loss, e.g. loss angle, loss factor or power factor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/34—Testing dynamo-electric machines
Abstract
The invention discloses a generator stator core loss test device capable of reducing switching-on impact current, which comprises an excitation winding and a measurement winding, wherein the excitation winding and the measurement winding are respectively wound on a generator stator core; two ends of the measuring winding are connected with a test voltage transformer in parallel and connected to the primary side of the measuring winding, and the secondary side of the test voltage transformer is connected with a voltmeter in parallel and connected with the voltage end of the power meter in parallel. The invention discloses a generator stator core loss test device capable of reducing switching-on impact current, which solves the problem that the existing test device generates larger impact current.
Description
Technical Field
The invention belongs to the technical field of electrical equipment test detection devices, and particularly relates to a generator stator core loss test device capable of reducing switching-on impact current.
Background
The stator iron core of the generator is formed by laminating silicon steel sheets, and during operation, the insulation between the sheets is damaged due to electric, thermal, mechanical vibration and the like, so that local hot spots are formed, and the safe operation of the generator is threatened. It is therefore necessary to test and judge the quality of the core through a core loss test.
The generator core loss test is to wind a test excitation cable and a measurement cable on a generator stator core respectively, and the test excitation cable and the measurement cable are used as an excitation winding and a voltage measurement winding respectively. And introducing power frequency current into the excitation winding to generate alternating magnetic flux close to a saturated state in the iron core. The core generates eddy current and hysteresis loss in the alternating magnetic flux, causing the core to generate heat. A large local eddy current is generated in a portion where insulation between iron core silicon steel sheets is deteriorated, and the temperature is rapidly increased. In the test, the local hot spot of the iron core can be monitored by an infrared thermometer, and the integral loss power of the iron core can be directly measured by a power meter.
The existing common generator core loss test method is that an excitation cable is directly connected to a factory-used 6kV bus through a vacuum circuit breaker, and when the circuit breaker is closed at the beginning of a test, a large impact current can be generated (generally, the test current is about 200-300A, and the impact current can reach 6-10 times of the test current and is more than 2000A). The impact current easily causes protection action, influences the voltage stability of the factory-used 6kV bus, and generates strong electromagnetic force to cause the cable to jump to influence safety.
Disclosure of Invention
The invention aims to provide a generator stator core loss test device capable of reducing switching-on impact current, and solves the problem that the existing test device generates large impact current.
The technical scheme adopted by the invention is as follows: a generator stator core loss test device capable of reducing switching-on impact current comprises an excitation winding and a measurement winding which are respectively wound on a generator stator core, wherein the excitation winding is sequentially connected with a vacuum circuit breaker and a station bus through cables; two ends of the measuring winding are connected with a test voltage transformer in parallel and connected to the primary side of the measuring winding, and the secondary side of the test voltage transformer is connected with a voltmeter in parallel and connected with the voltage end of the power meter in parallel.
The present invention is also characterized in that,
a transition resistor is connected in series on a cable between the vacuum circuit breaker and the excitation winding, two ends of the transition resistor are connected in parallel with a short-circuit switch, and the short-circuit switch is electrically connected to the controller.
The resistance value of the transition resistor is 2-200 omega.
And the two ends of the measuring winding are also connected with a grouped switching capacitor in parallel.
The group switching type capacitor comprises a plurality of groups of capacitors connected in parallel, each group of capacitors is connected in series with a switching switch, a switching main switch is connected between the group switching type capacitor and the measurement winding, and the switching main switch and the plurality of groups of switching switches are electrically connected to the controller.
The hall current sensor is also electrically connected to the controller.
The service bus is a service 6kV bus.
The invention has the beneficial effects that: the invention relates to a generator stator core loss test device capable of reducing switching-on impact current.A controller acquires line voltage U on a station bus through a power supply voltage transformerACWaveform, analyzing and searching for voltage zero crossing point, and controlling the vacuum circuit breaker to be in U state through time delay coordinationACThe highest point of the voltage amplitude is switched on, so that the impact current can be reduced to the maximum extent. In addition, the invention can also connect the transition resistance in series in the excitation winding loop and connect the grouping switching capacitor in parallel on the measuring winding, thereby greatly reducing the impact current and reducing the capacity of the power switch.
Drawings
FIG. 1 is a schematic structural diagram of a loss test device for a stator core of a generator capable of reducing a switching-on impact current according to the present invention;
FIG. 2 is a schematic diagram of a phase angle of a controller controlling a closing voltage in a generator stator core loss testing device capable of reducing a closing impact current according to the present invention;
FIG. 3 is a schematic diagram of a generator stator core loss test apparatus capable of reducing a switching-on inrush current according to the present invention, in which an equivalent capacitance value and an equivalent inductance form a resonance state;
fig. 4 is a schematic diagram of an internal structure of a controller in a generator stator core loss testing device capable of reducing a switching-on impact current.
In the figure, 1 is a generator stator core, 2 is an excitation winding, 3 is a measurement winding, 4 is a vacuum circuit breaker, 5 is a service bus, 6 is a power supply voltage transformer, 7 is a controller, 8 is a feedthrough current transformer, 9 is a Hall current sensor, 10 is a power meter, 11 is a test voltage transformer 12, a voltmeter, 13 is a transition resistor, 14 is a short-circuit switch, 15 is a grouping switching capacitor, 16 is a capacitor, 17 is a switching switch, and 18 is a switching master switch.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The invention provides a generator stator core loss test device capable of reducing closing impact current, which comprises an excitation winding 2 and a measurement winding 3 respectively wound on a generator stator core 1, wherein the excitation winding 2 is sequentially connected with a vacuum circuit breaker 4 and a 6kV factory bus 5 through cables, a power supply voltage transformer 6 and a controller 7 electrically connected with the vacuum circuit breaker 4 are sequentially connected on the cable between the factory bus 5 and the vacuum circuit breaker 4, a feed-through current transformer 8 is connected in series on the cable between the vacuum circuit breaker 4 and the excitation winding 2, a secondary side of the feed-through current transformer 8 is connected in series with a Hall current sensor 9 and a current end of a power meter 10, and the Hall current sensor 9 can select a feed-through pincerlike Hall effect current sensor with the model of HSTS 016L; two ends of the measurement winding 3 are connected with a test voltage transformer 11 in parallel and connected to the primary side of the measurement winding, and the secondary side of the test voltage transformer 11 is connected with a voltmeter 12 in parallel and connected with the voltage end of the power meter 10 in parallel. The power meter 10 can directly measure the power P through the voltage and the current collected by the test voltage transformer 11 and the straight-through current transformer 80Let the transformation ratio of the test voltage transformer 11 ben1The transformation ratio of the straight-through current transformer 8 is n2The number of turns of the excitation winding 2 is W1Measuring the number of turns of winding 3 as W2Then, the actual power loss P of the generator stator core 1 is:
P＝n1×n2×W1/W2×P0
as shown in fig. 2, the controller 7 collects the line voltage U on the 6kV bus through the power supply voltage transformer 6ACThe waveform of the voltage is analyzed and searched for the zero crossing point of the voltage, and the vacuum circuit breaker 4 is controlled to be in a U state through time delay matching (the closing time of the vacuum circuit breaker 4 needs to be considered)ACI.e. closing at a phase angle of 90 deg.. (when the switch-on is carried out at different voltage switch-on phase angles, the switch-on impact currents generated in the excitation winding 2 are obviously different, under the condition of not considering the residual magnetism of the iron core of the generator, the generated impact current is maximum when the switch-on voltage phase angle is 0 degrees, and when the switch-on voltage phase angle is 90 degrees, no impact current exists.
A transition resistor 13 is connected in series on a cable between the vacuum circuit breaker 4 and the excitation winding 2, and the resistance value of the transition resistor 13 is 2-200 omega, so that impact current can be greatly reduced in a switching-on process. Two ends of the transition resistor 13 are connected with a short-circuit switch 14 in parallel, the short-circuit switch 14 is electrically connected to the controller 7, the controller 7 closes the short-circuit switch 14 after switching on for 0.5-2 s, and the transition resistor 13 is in short circuit; and the short-circuit switch 14 can be switched on after the switching of the group switching capacitor 15 is finished, so that the transition resistor 13 is short-circuited.
The two ends of the measurement winding 3 are also connected in parallel with a grouping on-off capacitor 15, as shown in fig. 3, when the equivalent capacitance of the grouping on-off capacitor 15 and the equivalent inductance of the excitation winding 2 form a resonance state, the impedance is infinite, and the input current of the test power switch can be greatly reduced. The grouped switching capacitor 15 comprises a plurality of groups of capacitors 16 connected in parallel, each group of capacitors 16 is connected in series with a switching switch 17, a switching main switch 18 is connected between the grouped switching capacitor 15 and the measuring winding 3, and the switching main switch 18 and the plurality of groups of switching switches 17 are electrically connected to the controller 7. After the vacuum circuit breaker 4 is switched on, the controller 7 controls the switching of the switching switch 17, so that the equivalent inductance and capacitance of the exciting winding 2 are in a resonance state as much as possible, the test current is minimum, and the capacity of the power switch is also reduced to the minimum.
As shown in fig. 4, the calculation and control of the controller 7 adopt an STM32F407 single chip microcomputer, and includes: the device comprises a power supply module, an AD conversion module, a key input and display module and a resistance voltage division module, and outputs a switching-on and switching-off signal of a vacuum circuit breaker, a switching-on and switching-off signal of a short-circuit switch and a switching-on and switching-off signal of a fling-cut switch.
Wherein the power module supplies power to the chip.
The resistance voltage division module divides the secondary voltage signal of the power supply voltage transformer 6 and transmits the divided voltage signal to the AD conversion module 2. The divider resistor R1 can be standard resistor of CSR-105 type with resistance of 1M Ω. The divider resistor R2 can be standard resistor of CSR-104 with resistance of 100k omega.
The AD conversion module can select an AD conversion chip with the model number of AD 7606. The AD conversion module 1 converts signals transmitted by the Hall current sensor 9 into digital signals, transmits the digital signals to the single chip microcomputer, and collects and calculates the test current. The AD conversion module 2 converts the voltage signal after the resistance voltage division into a digital signal, and then transmits the digital signal to the singlechip to carry out the voltage U of the power lineACAnd collecting and calculating.
The key input and display module can enable a tester to input operation commands (such as commands of 'start', 'close', and the like) through keys, and can dynamically display test current and power voltage in real time.
The specific workflow of the controller 7 and the whole test is as follows:
before the test, the vacuum circuit breaker 4 is in an opening state, the short-circuit switch 14 is in an opening state, and the fling-cut switches 17 are all in an opening state. The tester starts the test by key input. The Hall current sensor 9 transmits the current of the secondary side of the straight-through current transformer 8 to the AD conversion module 1, converts the current into a digital signal, and transmits the digital signal to the single chip microcomputer to acquire and analyze the test current in real time. Supply voltage UACFrom mains voltage transformerAnd 6, collecting, dividing the voltage of the secondary side of the voltage transformer by a resistor, converting the voltage into a digital signal by the AD conversion module 2, and then transmitting the digital signal to the singlechip. The single chip microcomputer collects and analyzes the voltage waveform in real time. And the zero-crossing moment of the voltage waveform is searched through slope calculation. The single chip microcomputer sends a switching-on signal to the switching-on/off main switch 18 to control the switching-on/off main switch 18 to be switched on.
When a tester inputs a switching-on command through a key, the singlechip delays delta t at the zero crossing point moment of the voltage waveform (the delta t needs to consider the switching-on time of the vacuum circuit breaker 4 and needs to ensure that the switching-on moment is the power supply voltage UACThe highest amplitude), and then sends a closing signal to the vacuum circuit breaker 4 to control the vacuum circuit breaker 4 to close.
After the vacuum circuit breaker 4 is switched on, the single chip microcomputer sends a signal to the fling-cut switch 17, the fling-cut switch 1 is put into the test circuit, and the test current I is recorded1And then putting the 2 nd group of switching switches into the test circuit, and recording the test current I2And in the same way, finally putting the nth group of fling-cut switches into the test circuit, and recording the test current In. By comparison, the minimum current I is selectedmAnd the number m of switching groups. Finally, a signal is sent out, and m groups of the fling-cut switches 17 are put into use, so that the test current is minimum.
After the group switching capacitor is executed, the single chip microcomputer sends a closing signal to the short-circuit switch 14 to short-circuit the transition resistor 13.
According to the mode, the generator stator core loss test device capable of reducing the switching-on impact current is characterized in that the controller 7 acquires the line voltage U on the station bus 5 through the power supply voltage transformer 6ACWaveform, analyzing and searching for voltage zero crossing point, and controlling the vacuum circuit breaker 4 to be in U state through time delay coordinationACThe highest point of the voltage amplitude is switched on, so that the impact current can be reduced to the maximum extent. As a further improvement of the present invention, the present invention greatly reduces the inrush current and reduces the capacity of the power switch by connecting the transition resistor 13 in series in the loop of the excitation winding 2 and connecting the grouped switched capacitors 15 in parallel on the measurement winding 3.
Claims (7)
1. A generator stator core loss test device capable of reducing switching-on impact current is characterized by comprising an excitation winding (2) and a measurement winding (3) which are respectively wound on a generator stator core (1), wherein the excitation winding (2) is sequentially connected with a vacuum circuit breaker (4) and a service bus (5) through cables, a power supply voltage transformer (6) and a controller (7) electrically connected with the vacuum circuit breaker (4) are sequentially connected onto the cable between the service bus (5) and the vacuum circuit breaker (4), a feed-through current transformer (8) is connected onto the cable between the vacuum circuit breaker (4) and the excitation winding (2) in series, and the secondary side of the feed-through current transformer (8) is connected with a current end of a Hall current sensor (9) and a current end of a power meter (10) in series; two ends of the measuring winding (3) are connected with a test voltage transformer (11) in parallel and connected to the primary side of the measuring winding, and the secondary side of the test voltage transformer (11) is connected with a voltmeter (12) in parallel and connected with the voltage end of the power meter (10) in parallel.
2. The generator stator core loss test device capable of reducing the closing impact current as claimed in claim 1, wherein a transition resistor (13) is connected in series on a cable between the vacuum circuit breaker (4) and the excitation winding (2), a short-circuit switch (14) is connected in parallel at two ends of the transition resistor (13), and the short-circuit switch (14) is electrically connected to the controller (7).
3. The generator stator core loss test device capable of reducing the switching-on impact current as claimed in claim 1, wherein the resistance value of the transition resistor (13) is 2-200 Ω.
4. The generator stator core loss test device capable of reducing the switching-on impact current as claimed in claim 1, wherein the two ends of the measurement winding (3) are further connected in parallel with a group switching capacitor (15).
5. The generator stator core loss test device capable of reducing the switching-on impact current is characterized in that the grouped switching capacitors (15) comprise a plurality of groups of capacitors (16) connected in parallel, each group of capacitors (16) is connected in series with a switching switch (17), a switching main switch (18) is connected between the grouped switching capacitors (15) and the measurement winding (3), and the switching main switch (18) and the switching switches (17) are electrically connected to the controller (7).
6. The generator stator core loss test device capable of reducing the closing impact current as claimed in claim 5, wherein the Hall current sensor (9) is further electrically connected to the controller (7).
7. The generator stator core loss test device capable of reducing the switching-on impact current according to claim 1, wherein the service bus (5) is a service 6kV bus.
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| CN202010850285.3A CN112083231B (en) | 2020-08-21 | 2020-08-21 | Generator stator core loss test device capable of reducing closing impact current |
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| CN202010850285.3A CN112083231B (en) | 2020-08-21 | 2020-08-21 | Generator stator core loss test device capable of reducing closing impact current |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113252727A (en) * | 2021-05-17 | 2021-08-13 | 西安热工研究院有限公司 | Generator stator core magnetization test method |
| WO2023179153A1 (en) * | 2022-03-25 | 2023-09-28 | 西安热工研究院有限公司 | Generator iron core loss test system and method for reducing test impulse current |
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