CN116930579A - Inter-turn insulation detection device of dry voltage transformer - Google Patents

Inter-turn insulation detection device of dry voltage transformer Download PDF

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Publication number
CN116930579A
CN116930579A CN202310659124.XA CN202310659124A CN116930579A CN 116930579 A CN116930579 A CN 116930579A CN 202310659124 A CN202310659124 A CN 202310659124A CN 116930579 A CN116930579 A CN 116930579A
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China
Prior art keywords
voltage
transformer
module
electrically connected
resistor
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CN202310659124.XA
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Chinese (zh)
Inventor
王伟
胡德洋
冯志国
阮利生
薛飞
张涛
张文光
崔立朝
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State Grid Corp of China SGCC
KME Sp zoo
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State Grid Corp of China SGCC
KME Sp zoo
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Priority to CN202310659124.XA priority Critical patent/CN116930579A/en
Publication of CN116930579A publication Critical patent/CN116930579A/en
Pending legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
    • G01R1/28—Provision in measuring instruments for reference values, e.g. standard voltage, standard waveform
    • 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
    • G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
    • G01R31/14—Circuits therefor, e.g. for generating test voltages, sensing circuits
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
    • G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Testing Relating To Insulation (AREA)

Abstract

The application discloses a turn-to-turn insulation detection device of a dry voltage transformer, which comprises a voltage supply module, a resonance module, a voltage acquisition module and an insulation judgment module, wherein the power input end of the voltage supply module is electrically connected with the output end of an alternating current power supply; the voltage supply module is used for supplying power to the resonance module, the resonance module is used for generating voltage to be measured on the primary side of the voltage transformer, the voltage acquisition module is used for acquiring the voltage to be measured, the insulation judgment module is used for judging whether the voltage transformer is well insulated according to the voltage to be measured and the preset voltage, and the effectiveness of turn-to-turn insulation detection of the voltage transformer is improved.

Description

Inter-turn insulation detection device of dry voltage transformer
Technical Field
The application belongs to the technical field of voltage transformer insulation detection, and particularly relates to a dry-type voltage transformer inter-turn insulation detection device.
Background
The dry-type voltage transformer has the advantages of simple structure, convenient maintenance, reasonable price and the like, and is widely applied to the power system. The dry voltage transformer can separate electrical equipment such as a measuring instrument and a relay protection device in a circuit from a system so as to reduce the risk, and plays roles of converting voltage and expanding the measuring range of the measuring instrument. Due to the influence of factors such as design level, casting process, wire quality and operation environment, the internal insulation fault of the multi-cause dry-type voltage transformer occurs in various regions in China in recent years to cause power failure and shutdown events, and the safety and the stability of a power system are seriously threatened.
The failure point of the dry voltage transformer mostly occurs in the middle and lower part of the primary winding near the inner layer. The primary winding at the inner layer has relatively high temperature rise and worst heat dissipation condition, and meanwhile, the insulating material has poor quality or process defects, so that the thermal ageing of the insulating material is aggravated, the insulating strength is reduced, inter-turn local short circuits finally occur, and the local temperature is continuously increased due to the large circulation generated in the short circuit turns, so that the insulating strength is further reduced, and the inter-turn and inter-layer short circuits are continuously developed.
The current turn-to-turn or interlayer insulation detection means of the dry voltage transformer mainly comprise direct current resistance measurement, no-load current measurement, lightning impulse withstand voltage test, alternating current withstand voltage test and partial discharge measurement. The direct current resistance measurement and the no-load current measurement are suitable for diagnosis after the fault of the dry-type voltage transformer, and the detection of the latent insulation defect is difficult; the lightning impulse withstand voltage belongs to destructive tests, is only developed in the factory at present and is influenced by the turn-to-turn and interlayer distributed capacitance of the primary winding and the capacitance to ground, and the method has no obvious detection effect on the defects of the inner coil close to the iron core; the alternating-current withstand voltage is also a destructive test, and meanwhile, the defect detection rate of the method is low; partial discharge measurement is an effective means for detecting defects of the dry voltage transformer, but has strict requirements on electromagnetic environment, and is not suitable for detecting the insulation performance of the dry voltage transformer on site.
Disclosure of Invention
In view of the above, the present application provides a device for detecting the inter-turn insulation of a dry voltage transformer, which mainly aims to solve the problem that the inter-turn insulation of the dry voltage transformer cannot be effectively detected at present.
In order to solve the above problems, the present application provides a device for detecting turn-to-turn insulation of a dry voltage transformer, comprising: the device comprises a voltage providing module, a resonance module, a voltage acquisition module and an insulation judging module, wherein the power input end of the voltage providing module is electrically connected with the output end of an alternating current power supply, the power output end of the voltage providing module is electrically connected with the power input end of the resonance module, the trigger control end of the resonance module is electrically connected with the output end of a trigger signal providing terminal, the voltage output end to be detected of the resonance module is electrically connected with the voltage input end of the voltage acquisition module, and the voltage output end of the voltage acquisition module is electrically connected with the signal input end of the insulation judging module; the voltage supply module is used for supplying power to the resonance module, the resonance module is used for generating voltage to be tested on the primary side of the voltage transformer, the voltage acquisition module is used for acquiring the voltage to be tested, and the insulation judgment module is used for judging whether the voltage transformer is good in insulation or not according to the voltage to be tested and the preset voltage.
In one embodiment of the present application, optionally, the power output end of the voltage providing module includes a first power output end and a second power output end, the voltage input end of the voltage collecting module includes a first voltage input end and a second voltage input end, the resonance module includes a rectifying silicon stack, a protection resistor, a damping resistor, a trigger transformer, a controllable discharge switch, a charging capacitor, a resonance inductor, a voltage transformer, a first voltage dividing resistor, a second voltage dividing resistor and a voltmeter, wherein,
the first output end of a power supply of the voltage supply module is electrically connected with the cathode of the rectifying silicon stack, the anode of the rectifying silicon stack is electrically connected with the first end of the protection resistor, the second end of the protection resistor is electrically connected with the first end of the damping resistor and the first end of the controllable discharge switch respectively, the second end of the damping resistor is electrically connected with the first end of the charging capacitor and the first end of the first voltage dividing resistor respectively, the second end of the charging capacitor is electrically connected with the first end of the resonant inductor, the first end of the primary side of the voltage transformer and the first input end of the voltage acquisition module, the second end of the resonant inductor is electrically connected with the second end of the primary side of the voltage transformer, the second input end of the voltage acquisition module, the first end of the second voltage dividing resistor, the positive input end of the voltage meter, the second end of the controllable discharge switch, the second side first end of the trigger transformer and the second output end of the voltage supply module respectively, the second side of the trigger transformer and the first end of the voltage supply module are electrically connected with the first end of the voltage acquisition module, the second end of the trigger transformer and the second end of the voltage acquisition module are electrically connected with the first end of the voltage dividing resistor respectively.
In one embodiment of the present application, optionally, when the voltage providing module outputs a negative half-cycle voltage, the rectifying silicon stack, the protection resistor, the damping resistor, the charging capacitor, the resonant inductor, or the voltage transformer forms a charging circuit; when the voltage supply module outputs a positive half-cycle voltage, the trigger transformer, the controllable discharge switch, the damping resistor, the charging capacitor, the resonance inductor or the voltage transformer form a discharge circuit.
In one embodiment of the present application, optionally, when the primary-side inter-turn insulation of the voltage transformer is defective, the rectifying silicon stack, the protection resistor, the damping resistor, the charging capacitor and the voltage transformer form a charging circuit, and the trigger transformer, the controllable discharging switch, the damping resistor, the charging capacitor and the voltage transformer form a discharging circuit; when the primary side turn-to-turn insulation of the voltage transformer is good, the rectifying silicon stack, the protection resistor, the damping resistor, the charging capacitor and the resonance inductor form a charging circuit, and the trigger transformer, the controllable discharging switch, the damping resistor, the charging capacitor and the resonance inductor form a discharging circuit.
In one embodiment of the present application, optionally, the voltage acquisition module includes a first voltage dividing capacitor, a second voltage dividing capacitor, a matching resistor, a coaxial cable and a voltage collector, wherein,
the first end of the first voltage dividing capacitor is respectively and electrically connected with the second end of the charging capacitor, the first end of the resonant inductor and the first end of the primary side of the voltage transformer, the second end of the first voltage dividing capacitor is respectively and electrically connected with the first end of the second voltage dividing capacitor and the first end of the matching resistor, the second end of the matching resistor is respectively and electrically connected with the first end of the coaxial cable, the second end of the second voltage dividing capacitor, the second end of the resonant inductor and the second end of the primary side of the voltage transformer, and the second end of the coaxial cable is electrically connected with the input end of the voltage collector.
In one embodiment of the application, optionally, the voltage providing module comprises a step-up transformer and a step-down transformer, wherein,
the primary side of the voltage regulating transformer is electrically connected with the output end of the alternating current power supply, the secondary side of the voltage regulating transformer is electrically connected with the primary side of the step-up transformer, and the secondary side of the step-up transformer is electrically connected with the power input end of the resonance module.
In one embodiment of the present application, optionally, when the time corresponding to the zero crossing of the voltage to be measured is advanced from the time corresponding to the zero crossing of the preset voltage, the insulation determination module determines that the turn-to-turn insulation of the voltage transformer is defective.
In one embodiment of the present application, optionally, the controllable discharge switch is a controllable discharge release ball.
In one embodiment of the present application, optionally, the insulation determination module is a controller.
The application has the beneficial effects that: according to the turn-to-turn insulation detection device for the dry voltage transformer, provided by the application, the voltage supply module is used for supplying power to the resonance module, when the resonance module oscillates, the voltage to be detected is generated on the primary side of the dry voltage transformer, the voltage acquisition module acquires the voltage to be detected on the primary side of the voltage transformer and sends the voltage to the insulation judgment module, the insulation judgment module compares the acquired waveform of the voltage to be detected with the waveform of the preset voltage to determine whether the voltage transformer is well insulated, and the detection device can accurately judge whether the voltage transformer is well insulated without damaging the voltage transformer only by connecting the voltage transformer into a circuit, so that the device has good anti-interference performance, and the effectiveness and the practicability of the turn-to-turn insulation detection of the dry voltage transformer are improved.
The foregoing description is only an overview of the present application, and is intended to be implemented in accordance with the teachings of the present application in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present application more readily apparent.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:
fig. 1 is a block diagram of a dry-type voltage transformer inter-turn insulation detection device according to an exemplary embodiment of the present application;
fig. 2 is a structural connection diagram of a device for detecting turn-to-turn insulation of a dry voltage transformer according to an exemplary embodiment of the present application;
fig. 3 is a connection diagram of a charging circuit structure of a device for detecting turn-to-turn insulation of a dry voltage transformer according to an exemplary embodiment of the present application;
fig. 4 is a connection diagram of a discharging circuit structure based on a dry-type voltage transformer inter-turn insulation detection device according to an exemplary embodiment of the present application;
fig. 5 is a connection diagram of a voltage acquisition module based on a dry-type voltage transformer inter-turn insulation detection device according to an exemplary embodiment of the present application.
Wherein, the liquid crystal display device comprises a liquid crystal display device,
the reference numerals of fig. 1-5 are as follows: 12-a voltage supply module; 14-a resonance module, 16-a voltage acquisition module; 18-an insulation judgment module; 20-an alternating current power supply; 30-a trigger signal providing terminal; t (T) 1 -a step-down transformer; t (T) 2 -a step-up transformer; t (T) 3 -triggering a transformer; d-rectifying a silicon stack; r is R 1 -a protection resistor; r is R 2 -a damping resistor; r is R 3 -a matching resistor, S-controllable discharge switch; c (C) H -a first voltage dividing capacitance; c (C) L -a second voltage dividing capacitance; r is R H -a first voltage dividing resistor; r is R L -a second voltage divider resistor; DL-coaxial cable; a Z-voltage collector; an L-resonant inductance; c (C) C -a charging capacitor; PT-voltage transformer; v-voltmeter.
Detailed Description
The application will be described in detail hereinafter with reference to the drawings in conjunction with embodiments. It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other.
In order to further describe the technical means and effects adopted for achieving the preset aim of the application, the following detailed description refers to the specific implementation, structure, characteristics and effects according to the application of the application with reference to the accompanying drawings and preferred embodiments. In the following description, different "an embodiment" or "an embodiment" do not necessarily refer to the same embodiment. Furthermore, the particular features, structures, or characteristics of one or more embodiments may be combined in any suitable manner.
The following describes a dry-type voltage transformer inter-turn insulation detection device according to some embodiments of the present application with reference to fig. 1 to 5.
In one embodiment, as shown in fig. 1, a dry voltage transformer inter-turn insulation detection device includes a voltage providing module 12, a resonance module 14, a voltage acquisition module 16, and an insulation determination module 18, wherein,
the power input end of the voltage supply module 12 is electrically connected with the output end of the alternating current power supply 20, the power output end of the voltage supply module 12 is electrically connected with the power input end of the resonance module 14, the trigger control end of the resonance module 14 is electrically connected with the output end of the trigger signal supply terminal 30, the voltage output end to be tested of the resonance module 14 is electrically connected with the voltage input end of the voltage acquisition module 16, and the voltage output end of the voltage acquisition module 16 is electrically connected with the signal input end of the insulation judging module 18;
the voltage providing module 12 is configured to provide a power supply to the resonance module 14, the resonance module 14 is configured to generate a voltage to be measured on a primary side of the voltage transformer PT, the voltage collecting module 16 is configured to collect the voltage to be measured, and the insulation determining module 18 is configured to determine whether the voltage transformer PT is well insulated according to the voltage to be measured and a preset voltage.
Specifically, the dry voltage transformer is arranged in the resonance module, the voltage supply module supplies power to the resonance module, the resonance module oscillates, the primary side of the dry voltage transformer in the resonance module has voltage, the voltage acquisition module acquires the primary side voltage of the voltage transformer and sends the primary side voltage to the insulation judgment module, and the insulation judgment module compares the waveform of the primary side voltage of the acquired voltage transformer with the waveform of the preset voltage to determine whether the voltage transformer is well insulated.
Compared with the prior art, the device for detecting the inter-turn insulation of the dry voltage transformer provided by the application has the advantages that the voltage supply module is used for supplying power to the resonance module, when the resonance module oscillates, the voltage to be detected is generated on the primary side of the dry voltage transformer, the voltage to be detected on the primary side of the voltage transformer is collected by the voltage collection module and is sent to the insulation judgment module, the insulation judgment module compares the waveform of the collected voltage to be detected with the waveform of the preset voltage to determine whether the voltage transformer is good in insulation, and the detection device can accurately judge whether the voltage transformer is good in insulation without damaging the voltage transformer only by connecting the voltage transformer into a circuit, so that the device has good anti-interference performance, and the effectiveness and the practicability of inter-turn insulation detection of the dry voltage transformer are improved.
In one embodiment, as shown in FIG. 2, the power output of the voltage providing module 12 includes a power first output and a power second output, the voltage input of the voltage acquisition module 16 includes a voltage first input and a voltage second input, and the resonant module 14 includes a rectifying silicon stack D, a protection resistor R 1 Damping resistor R 2 Trigger transformer T 3 Controllable discharging switch S and charging capacitor C C Resonant inductance L, voltage transformer PT, first voltage dividing resistor R H Second voltage-dividing resistor R L And a voltmeter V, wherein,
the first output end of the power supply of the voltage supply module 12 is electrically connected with the cathode of the rectifying silicon stack D, the anode of the rectifying silicon stack D and the protection resistor R 1 Is electrically connected with the first end of the protection resistor R 1 Respectively with the damping resistor R at the second end 2 Is electrically connected with the first end of the controllable discharge switch S, and the damping resistor R 2 Respectively with the charging capacitor C C And a first voltage dividing resistor R H Is electrically connected with the first end of the charging capacitor C C The second end of the resonant inductor L is respectively electrically connected with the first end of the resonant inductor L, the primary side first end of the voltage transformer PT and the voltage first input end of the voltage acquisition module 16, and the second end of the resonant inductor L is respectively connected with the primary side second end of the voltage transformer PT, the voltage second input end of the voltage acquisition module 16 and the second voltage dividing resistor R L A positive input end of a voltmeter V, a second end of a controllable discharge switch S, a trigger transformer T 3 And a second power supply input of the voltage supply module 12The output end is electrically connected with the trigger transformer T 3 The second end of the secondary side of the transformer T is electrically connected with the control end of the controllable discharge switch S 3 The primary side of (2) is electrically connected with the output end of the trigger signal providing terminal 30, and a second voltage dividing resistor R L The second end of (a) is respectively connected with the first voltage dividing resistor R H Is electrically connected to the negative input of the voltmeter V.
Specifically, a first output end of a power supply of the voltage supply module is connected with a cathode of the high-voltage silicon stack, and an anode of the high-voltage silicon stack is connected with one end of the protection resistor; the other end of the protection resistor is connected with one end of the damping resistor and the first end of the controllable discharge switch, namely one end of the protection resistor, one end of the damping resistor and the first end of the controllable discharge switch are intersected at one position; the other end of the damping resistor is connected with one end of the charge point capacitor and one end of the first voltage dividing resistor, namely the other end of the damping resistor, one end of the charge point capacitor and one end of the first voltage dividing resistor are connected in a wiring intersection mode; the other end of the charging capacitor is connected with one end of the resonant inductor and one end of the winding on one side of the dry voltage transformer to be measured, namely, one end of the charging capacitor, one end of the resonant inductor and one end of the winding on one side of the dry voltage transformer to be measured are connected in one place.
Because the first output end of the power supply of the voltage supply module is connected with the cathode of the rectifying silicon stack, when the output voltage of the voltage supply module is in a negative half period, the charging capacitor is charged; meanwhile, the high-voltage silicon stack changes alternating voltage into direct voltage, when the voltage supply module generates large current, a step-up transformer in the voltage supply module is easy to burn, and therefore a protection resistor is connected to realize current limiting. The capacitance value of the charging capacitor is small, and the terminal voltage of the charging capacitor can reach a set value within 0.01 s. The withstand voltage level of the controllable discharge switch is far greater than the voltage across the controllable discharge switch applied by rectification, so the controllable discharge switch is in an insulating state.
The primary side of the trigger transformer is the receiving side of the pulse control signal, one end of the secondary side of the trigger transformer is connected with the second end of the controllable discharge switch, the first end of the controllable discharge switch is connected with the second end of the damping resistor, and the second end of the controllable discharge switch is connected with the other end of the primary winding of the dry-type voltage transformer and the other end of the resonant inductor.
The controllable discharge switch is preferably a controllable discharge ball gap, when the voltage output by the step-up transformer is in a positive half period, a primary side of the trigger transformer receives a pulse trigger signal, a secondary side of the trigger transformer outputs voltage, and the controllable discharge ball gap is triggered, so that the gap between balls is broken down and discharged, a circuit is conducted, an RLC oscillation discharge loop is formed, and voltage is generated at two ends of the primary side of the resonant inductor or the dry type transformer. Because of the existence of the damping resistor, the oscillation is damped to be very small within 0.01s, the controllable discharge ball gap is extinguished, and the air insulation between the ball gaps is restored.
The first voltage dividing resistor and the second voltage dividing resistor form a resistor voltage divider, the resistor voltage divider converts direct-current high voltage into direct-current low voltage, the direct-current low voltage is connected to an electrostatic voltmeter, the charging voltage of the charging capacitor is measured, whether the experimental set voltage is reached or not is further determined, and when the dry voltage transformer is broken down, the turn-to-turn short circuit of the dry voltage transformer is achieved.
In one embodiment, as shown in FIG. 3, when the voltage providing module 12 outputs a negative half-cycle voltage, the silicon rectifier D and the protection resistor R 1 Damping resistor R 2 Charging capacitor C C The resonant inductor L or the voltage transformer PT forms a charging circuit; as shown in fig. 4, when the voltage supply module outputs a positive half-period voltage, the transformer T is triggered 3 A controllable discharge switch S and a damping resistor R 2 Charging capacitor C C The resonant inductance L or the voltage transformer PT constitutes a discharge circuit.
In one embodiment, when the primary side inter-turn insulation of the voltage transformer PT is defective, the silicon rectifier stack D and the protection resistor R 1 Damping resistor R 2 Charging capacitor C C And a voltage transformer PT form a charging circuit to trigger a transformer T 3 A controllable discharge switch S and a damping resistor R 2 Charging capacitor C C And a voltage transformer PT form a discharge circuit; when the primary side turn-to-turn insulation of the voltage transformer PT is good, the rectifier silicon stack D and the protection resistor R 1 Damping resistor R 2 Charging capacitor C C And the resonant inductance L form a charging circuit to triggerTransformer T 3 A controllable discharge switch S and a damping resistor R 2 Charging capacitor C C And the resonant inductance L constitute a discharge circuit.
The charging capacitor charges when the voltage providing module output voltage is in the negative half cycle. Because the inductance of the primary winding of the dry voltage transformer is larger, when the turn-to-turn insulation of the dry voltage transformer is good, the resonance inductance is far smaller than the inductance of the primary winding of the dry voltage transformer, so that the rectifier silicon stack, the protection resistor, the damping resistor, the charging capacitor and the resonance inductance form a charging circuit; when the turn-to-turn insulation of the dry voltage transformer has defects, the inductance of the primary winding of the dry voltage transformer is smaller than the resonance inductance, so that the rectifier silicon stack, the protection resistor, the damping resistor, the charging capacitor and the voltage transformer form a charging loop.
The charge capacitor discharges when the voltage providing module output voltage is in the positive half cycle. When the voltage supply module outputs a positive half period of voltage, the controllable discharge switch breaks down and discharges to form an oscillating circuit, the arc is extinguished, and the discharge is ended. Under certain conditions, this process is repeated until the power is turned off. Because the inductance of the primary winding of the dry voltage transformer is larger, when the inter-turn insulation of the dry voltage transformer is good, the resonance inductance is far smaller than the inductance of the primary winding of the dry voltage transformer, so that a trigger transformer, a controllable discharge switch, a damping resistor, a charging capacitor and a resonance inductance form a discharge circuit, and when the inter-turn insulation of the dry voltage transformer is good, the resonance frequency of the resonance module is 500Hz; when the turn-to-turn insulation of the dry voltage transformer has defects, the inductance of the primary winding of the dry voltage transformer is smaller than the resonance inductance, so that the trigger transformer, the controllable discharge switch, the damping resistor, the charging capacitor and the voltage transformer form a discharge circuit.
Because the inductance of the primary winding of the dry voltage transformer is larger, if the inductance is not connected in parallel, the oscillation speed is very slow, and the oscillation of one cycle cannot be completed within 0.01s, so that the inductance is required to be connected in parallel, and the oscillation speed is increased; and a damping resistor is connected in series with the oscillating circuit, so that rapid damping within 0.01s is realized.
In one embodiment, as shown in FIG. 5, a voltage acquisition dieThe block 16 includes a first voltage dividing capacitor C H Second voltage dividing capacitor C L Matching resistor R 3 A coaxial cable DL and a voltage collector Z, wherein,
first voltage-dividing capacitor C H Respectively with the charging capacitor C C A first voltage dividing capacitor C electrically connected with the second end of the resonant inductor L and the first end of the primary side of the voltage transformer PT H Respectively with the second voltage dividing capacitor C L And a matching resistor R 3 Is electrically connected with the first end of the matching resistor R 3 And the second end of the coaxial cable DL is respectively connected with the first end and the second voltage dividing capacitor C of the coaxial cable DL L The second end of the coaxial cable DL is electrically connected to the input end of the voltage collector Z.
Specifically, one end of the coaxial cable core is connected with one end of the matching resistor; the other end of the coaxial cable core is connected with an input port of the voltage collector; the other end of the voltage collector is connected with one end of the netlike conducting layer of the coaxial cable; the first voltage dividing capacitor and the second voltage dividing capacitor form a capacitive voltage divider, the capacitive voltage divider converts the resonance voltage into low voltage, the resistance value of the matching resistor is the same as the wave impedance value of the coaxial cable, and the waveform lossless propagation can be realized. Preferably, the voltage collector employs an oscilloscope.
In one embodiment, as shown in FIG. 2, the voltage providing module 12 includes a step-down transformer T 1 And step-up transformer T 2 Wherein, the method comprises the steps of, wherein,
voltage regulating transformer T 1 Is electrically connected with the output end of the alternating current power supply 20, and is provided with a voltage regulating transformer T 1 Secondary side of (a) and step-up transformer T 2 Is electrically connected to the primary side of the step-up transformer T 2 Is electrically connected to the power input of the resonator module 14.
Specifically, the power grid voltage is connected to the primary side of the voltage regulating transformer, and the secondary side of the voltage regulator is enabled to output the set voltage by adjusting the secondary side tap of the voltage regulator. The step-up transformer is used for raising the output voltage of the step-up transformer to the test voltage and providing power for the resonance module.
In one embodiment, the insulation determination module 18 determines that the inter-turn insulation of the voltage transformer PT is defective when the time corresponding to the zero crossing of the voltage to be measured is advanced from the time corresponding to the zero crossing of the preset voltage.
Specifically, a preset voltage, for example, 30% of the voltage is applied, and the output voltage waveform is a standard waveform, i.e., the preset voltage waveform. And applying a set voltage through the voltage regulating transformer, detecting a voltage waveform, comparing the detected voltage waveform with a preset voltage waveform, and determining that the dry voltage transformer has an inter-turn fault, namely that the inter-turn insulation has a defect when the time of a zero crossing point in the detected voltage waveform is advanced from the time of the zero crossing point in the preset voltage waveform.
In one embodiment, the controllable discharge switch S is a controllable discharge release ball.
In one embodiment, the protection resistor has a resistance of 50kΩ, the damping resistor has a resistance of 20kΩ, the matching resistor has a resistance of 75Ω, the first voltage dividing capacitor has a capacitance of 150pF, the second voltage dividing capacitor has a capacitance of 150nF, the first voltage dividing resistor has a resistance of 75mΩ, the second voltage dividing resistor has a resistance of 75kΩ, the coaxial cable has a wave impedance of 75Ω, the resonant inductor has an inductance of 33H, and the charging capacitor has a capacitance of 3nF.
In one embodiment, the insulation determination module 18 is a controller.
The application meets the requirements of the pulse oscillation method turn-to-turn overvoltage test in the national standard GB109.4-2011 that the oscillation frequency is less than 100kHz, the test duration is 1min, the over-voltage with the required amplitude is not less than 3000, and the required amplitude is stable.
The process of the turn-to-turn insulation detection device of the dry voltage transformer is as follows: when the turn-to-turn insulation of the dry voltage transformer is good, the output voltage of the step-up transformer is in a negative half period, and the inductance of the primary winding of the dry voltage transformer is larger, the resonance inductance is far smaller than that of the primary winding of the dry voltage transformer, so that the step-up transformer, the rectifier silicon stack, the protection resistor, the damping resistor, the charging capacitor and the resonance inductance form a charging circuit, when the output voltage of the step-up transformer is in a positive half period, the primary side of the step-up transformer receives a pulse trigger signal, the secondary side of the step-up transformer is triggered to output voltage, a controllable discharge ball gap is triggered, breakdown discharge of the ball gap is caused, and the circuit is conducted, so that an RLC discharge loop is formed. Because the inductance of the primary winding of the dry voltage transformer is larger, when the turn-to-turn insulation of the dry voltage transformer is good, the resonance inductance is far smaller than the inductance of the primary winding of the dry voltage transformer, so that the trigger transformer, the controllable discharge switch, the damping resistor, the charging capacitor and the resonance form a discharge circuit.
When the turn-to-turn insulation of the dry voltage transformer is defective, the output voltage of the step-up transformer is in a negative half period, and the inductance of the primary winding of the dry voltage transformer is smaller, so that the resonance inductance is far greater than the inductance of the primary winding of the dry voltage transformer, and a charging circuit is formed by the step-up transformer, the rectifier silicon stack, the protection resistor, the damping resistor, the charging capacitor and the primary winding of the voltage transformer; when the output voltage of the step-up transformer is in a positive half period, the controllable discharge switch breaks down and discharges to form an oscillating circuit, the arc is extinguished, and the discharge is ended. Under certain conditions, this process is repeated until the power is turned off. Because the inductance of the primary winding of the dry voltage transformer is larger, when the turn-to-turn insulation of the dry voltage transformer has defects, the inductance of the primary winding of the dry voltage transformer is smaller than the resonance inductance, so that the trigger transformer, the controllable discharge switch, the damping resistor, the charging capacitor and the voltage transformer form a discharge circuit.
When the inter-turn insulation of the dry voltage transformer is good, the primary side voltage oscillation period of the voltage transformer, which is acquired by the voltage acquisition module, is long, when the inter-turn insulation of the dry voltage transformer is defective, the primary side voltage oscillation period of the voltage transformer, which is acquired by the voltage acquisition module, is short, the time of the zero crossing point of the primary side voltage waveform of the voltage transformer is advanced from the time of the zero crossing point of the preset voltage waveform, and the insulation judgment module determines that the inter-turn insulation of the dry voltage transformer is defective.
It should be understood that various modifications may be made to the embodiments of the application herein. Therefore, the above description should not be taken as limiting, but merely as exemplification of the embodiments. Other modifications within the scope and spirit of the application will occur to persons of ordinary skill in the art.
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the application and, together with a general description of the application given above, and the detailed description of the embodiments given below, serve to explain the principles of the application.
These and other characteristics of the application will become apparent from the following description of a preferred form of embodiment, given as a non-limiting example, with reference to the accompanying drawings.
It is also to be understood that, although the application has been described with reference to some specific examples, those skilled in the art can certainly realize many other equivalent forms of the application.
The above and other aspects, features and advantages of the present application will become more apparent in light of the following detailed description when taken in conjunction with the accompanying drawings.
Specific embodiments of the present application will be described hereinafter with reference to the accompanying drawings; however, it is to be understood that the disclosed embodiments are merely exemplary of the application, which can be embodied in various forms. Well-known and/or repeated functions and constructions are not described in detail to avoid obscuring the application in unnecessary or unnecessary detail. Therefore, specific structural and functional details disclosed herein are not intended to be limiting, but merely as a basis for the claims and as a representative basis for teaching one skilled in the art to variously employ the present application in virtually any appropriately detailed structure.
The specification may use the word "in one embodiment," "in another embodiment," "in yet another embodiment," or "in other embodiments," which may each refer to one or more of the same or different embodiments in accordance with the application.
The above embodiments are only exemplary embodiments of the present application and are not intended to limit the present application, the scope of which is defined by the claims. Various modifications and equivalent arrangements of this application will occur to those skilled in the art, and are intended to be within the spirit and scope of the application.

Claims (9)

1. The utility model provides a dry-type voltage transformer turn-to-turn insulation detection device which characterized in that includes: the device comprises a voltage supply module, a resonance module, a voltage acquisition module and an insulation judgment module, wherein,
the power input end of the voltage supply module is electrically connected with the output end of the alternating current power supply, the power output end of the voltage supply module is electrically connected with the power input end of the resonance module, the trigger control end of the resonance module is electrically connected with the output end of the trigger signal supply terminal, the voltage output end to be detected of the resonance module is electrically connected with the voltage input end of the voltage acquisition module, and the voltage output end of the voltage acquisition module is electrically connected with the signal input end of the insulation judgment module;
the voltage supply module is used for supplying power to the resonance module, the resonance module is used for generating voltage to be tested on the primary side of the voltage transformer, the voltage acquisition module is used for acquiring the voltage to be tested, and the insulation judgment module is used for judging whether the voltage transformer is good in insulation or not according to the voltage to be tested and the preset voltage.
2. The dry voltage transformer turn-to-turn insulation detection device of claim 1 wherein the power output of the voltage providing module comprises a first power output and a second power output, the voltage input of the voltage acquisition module comprises a first voltage input and a second voltage input, the resonant module comprises a rectifying silicon stack, a protection resistor, a damping resistor, a triggering transformer, a controllable discharge switch, a charging capacitor, a resonant inductor, a voltage transformer, a first voltage dividing resistor, a second voltage dividing resistor and a voltmeter,
the first output end of a power supply of the voltage supply module is electrically connected with the cathode of the rectifying silicon stack, the anode of the rectifying silicon stack is electrically connected with the first end of the protection resistor, the second end of the protection resistor is electrically connected with the first end of the damping resistor and the first end of the controllable discharge switch respectively, the second end of the damping resistor is electrically connected with the first end of the charging capacitor and the first end of the first voltage dividing resistor respectively, the second end of the charging capacitor is electrically connected with the first end of the resonant inductor, the first end of the primary side of the voltage transformer and the first input end of the voltage acquisition module, the second end of the resonant inductor is electrically connected with the second end of the primary side of the voltage transformer, the second input end of the voltage acquisition module, the first end of the second voltage dividing resistor, the input end of the voltage meter, the second end of the controllable discharge switch, the second side first end of the trigger transformer and the first output end of the power supply of the voltage supply module respectively, the second side of the trigger transformer and the second end of the trigger transformer are electrically connected with the first end of the voltage acquisition module, and the second end of the trigger voltage meter are electrically connected with the first end of the voltage dividing resistor and the second end of the trigger resistor respectively.
3. The dry voltage transformer inter-turn insulation detection device according to claim 2, wherein the rectifying silicon stack, the protection resistor, the damping resistor, the charging capacitor, the resonant inductor, or the voltage transformer constitutes a charging circuit when the voltage supply module outputs a negative half-cycle voltage; when the voltage supply module outputs a positive half-cycle voltage, the trigger transformer, the controllable discharge switch, the damping resistor, the charging capacitor, the resonance inductor or the voltage transformer form a discharge circuit.
4. The dry voltage transformer inter-turn insulation detection device according to claim 3, wherein when the primary side inter-turn insulation of the voltage transformer is defective, the rectifying silicon stack, the protection resistor, the damping resistor, the charging capacitor and the voltage transformer form a charging circuit, and the trigger transformer, the controllable discharging switch, the damping resistor, the charging capacitor and the voltage transformer form a discharging circuit; when the primary side turn-to-turn insulation of the voltage transformer is good, the rectifying silicon stack, the protection resistor, the damping resistor, the charging capacitor and the resonance inductor form a charging circuit, and the trigger transformer, the controllable discharging switch, the damping resistor, the charging capacitor and the resonance inductor form a discharging circuit.
5. The dry voltage transformer inter-turn insulation detection device of claim 1, wherein the voltage acquisition module comprises a first voltage dividing capacitor, a second voltage dividing capacitor, a matching resistor, a coaxial cable, and a voltage collector, wherein,
the first end of the first voltage dividing capacitor is respectively and electrically connected with the second end of the charging capacitor, the first end of the resonant inductor and the first end of the primary side of the voltage transformer, the second end of the first voltage dividing capacitor is respectively and electrically connected with the first end of the second voltage dividing capacitor and the first end of the matching resistor, the second end of the matching resistor is respectively and electrically connected with the first end of the coaxial cable, the second end of the second voltage dividing capacitor, the second end of the resonant inductor and the second end of the primary side of the voltage transformer, and the second end of the coaxial cable is electrically connected with the input end of the voltage collector.
6. The apparatus of claim 1, wherein the voltage supply module comprises a step-up transformer and a step-down transformer, wherein,
the primary side of the voltage regulating transformer is electrically connected with the output end of the alternating current power supply, the secondary side of the voltage regulating transformer is electrically connected with the primary side of the step-up transformer, and the secondary side of the step-up transformer is electrically connected with the power input end of the resonance module.
7. The dry voltage transformer inter-turn insulation detection device according to claim 1, wherein the insulation determination module determines that the voltage transformer inter-turn insulation is defective when a time corresponding to a zero crossing of the voltage to be detected is advanced from a time corresponding to a zero crossing of the preset voltage.
8. The dry voltage transformer inter-turn insulation detection device of claim 2, wherein the controllable discharge switch is a controllable discharge release ball.
9. The dry voltage transformer inter-turn insulation detection device of any one of claims 1-8, wherein the insulation determination module is a controller.
CN202310659124.XA 2023-06-05 2023-06-05 Inter-turn insulation detection device of dry voltage transformer Pending CN116930579A (en)

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CN202310659124.XA CN116930579A (en) 2023-06-05 2023-06-05 Inter-turn insulation detection device of dry voltage transformer

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Application Number Priority Date Filing Date Title
CN202310659124.XA CN116930579A (en) 2023-06-05 2023-06-05 Inter-turn insulation detection device of dry voltage transformer

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