CN114156069B - System and method for testing short-circuit resistance of voltage-regulating rectifier transformer - Google Patents
System and method for testing short-circuit resistance of voltage-regulating rectifier transformer Download PDFInfo
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- CN114156069B CN114156069B CN202111318384.8A CN202111318384A CN114156069B CN 114156069 B CN114156069 B CN 114156069B CN 202111318384 A CN202111318384 A CN 202111318384A CN 114156069 B CN114156069 B CN 114156069B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/40—Structural association with built-in electric component, e.g. fuse
- H01F27/402—Association of measuring or protective means
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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
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/2801—Testing of printed circuits, backplanes, motherboards, hybrid circuits or carriers for multichip packages [MCP]
- G01R31/281—Specific types of tests or tests for a specific type of fault, e.g. thermal mapping, shorts testing
- G01R31/2812—Checking for open circuits or shorts, e.g. solder bridges; Testing conductivity, resistivity or impedance
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Abstract
The invention provides a short-circuit resistance test system of a voltage-regulating rectifier transformer, which comprises a direct-current power supply DC, wherein an inverter T0 is connected with the direct-current power supply DC; the input end of the input circuit is connected with the output end of the inverter T0; the input end of the voltage regulating rectifier transformer T1 is connected with the output end of the input circuit; the input end of the short circuit testing circuit is connected with the output end of the voltage regulating rectifier transformer T1; the input circuit comprises a disconnecting switch QS1, a reactor L1, a disconnecting switch QS2, a resistor R1, a capacitor C1 and a breaker QF1; one phase output end of the inverter T0 is connected with the input end of the voltage regulating rectifier transformer T1 and one end of the isolating switch QS2 through a breaker QF1, the isolating switch QS1 and the reactor L1; the other end of the isolating switch QS2 is connected with one end of a capacitor C1 through a resistor R1, and the other end of the capacitor C1 is grounded; the short circuit test circuit is used for carrying out short circuit test. The invention provides reactive power by the branch circuit where the resistor R1 and the capacitor C1 are positioned, improves the test capacity and is convenient to operate.
Description
Technical Field
The invention relates to the technical field of testing of transformers, in particular to a system and a method for testing the short-circuit resistance of a voltage-regulating rectifier transformer.
Background
The rectifier transformer is a power transformer of the rectifier device. The regulating rectifier transformer is an integrated device of a voltage regulator and a rectifier transformer, and can regulate the voltage to supply the proper voltage to the rectifier system. The voltage regulating rectifier transformer must be tested for short-circuit strength before it is formally put into service.
At present, the test of the short circuit bearing capacity with large capacity cannot be performed under the limitation of the capacity and the running condition of a power grid. Therefore, it is necessary to provide a test system for short-circuit resistance of a voltage regulating rectifier transformer.
Disclosure of Invention
The invention provides a short-circuit resistance testing system of a voltage regulating rectifier transformer, so as to meet the requirements.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the short-circuit resistance test system of a kind of regulating rectifier transformer, including direct-flow power DC, connect with inverter T0; the input end of the input circuit is connected with the output end of the inverter T0; the input end of the voltage regulating rectifier transformer T1 is connected with the output end of the input circuit; the input end of the short circuit testing circuit is connected with the output end of the voltage regulating rectifier transformer T1; the input circuit comprises a disconnecting switch QS1, a reactor L1, a disconnecting switch QS2, a resistor R1, a capacitor C1 and a breaker QF1;
when the voltage-regulating rectifier transformer T1 is a single phase, a phase of the output branch of the inverter T0: a phase output end of the inverter T0 is connected with an input end of the voltage regulating rectifier transformer T1 and one end of the isolating switch QS2 through the breaker QF1, the isolating switch QS1 and the reactor L1; the other end of the isolating switch QS2 is connected with one end of the capacitor C1 through the resistor R1, and the other end of the capacitor C1 is grounded;
when the voltage-regulating rectifier transformer T1 is three-phase, each phase of output branch of the inverter T0: each phase output end of the inverter T0 is connected with the input end of the voltage regulating rectifier transformer T1 and one end of the isolating switch QS2 through the circuit breaker QF1, the isolating switch QS1 and the reactor L1; the other end of the isolating switch QS2 is connected with one end of the capacitor C1 through the resistor R1, and the other end of the capacitor C1 is grounded;
the short circuit test circuit is used for conducting short circuit test.
In one embodiment of the disclosure, the short-circuit test circuit includes a disconnecting switch QS3, a circuit breaker QF2, and a reactor L2;
when the voltage-regulating rectifier transformer T1 is a single phase, a phase output branch of the voltage-regulating rectifier transformer T1: one phase output end of the voltage regulating rectifier transformer T1 is connected with the reactor L2 through the isolating switch QS3 and the breaker QF2 and then grounded;
when the voltage-regulating rectifier transformer T1 is three-phase, each phase of output branch of the voltage-regulating rectifier transformer T1: each phase output end of the voltage regulating rectifier transformer T1 is connected with the reactor L2 through the isolating switch QS3 and the breaker QF2 and then grounded.
In one embodiment of the disclosure, the inverter T0 includes a voltage stabilizing circuit, a signal generating circuit, a signal amplifying circuit, and a power transforming circuit, where the direct current power DC is connected to the voltage stabilizing circuit, the signal amplifying circuit, and the power transforming circuit, the voltage stabilizing circuit is connected to the signal generating circuit, the signal generating circuit is connected to the signal amplifying circuit, and the signal amplifying circuit is connected to the power transforming circuit.
In one embodiment of the disclosure, the voltage stabilizing circuit includes a voltage stabilizer U2, a capacitor C3 and a capacitor C4, wherein the output end of the direct current power supply DC is connected to the input end of the voltage stabilizer U2 and one end of the capacitor C3, the other end of the capacitor C3 is grounded, the output end of the voltage stabilizer U2 is connected to the signal generating circuit and one end of the capacitor C4, and the other end of the capacitor C4 is grounded.
In one embodiment of the disclosure, the signal generating circuit includes a six inverter U1, a resistor R7, a resistor R2, a resistor R3, a resistor R4, an adjustable resistor VR1 and an electrolytic capacitor C5, where an output end of the voltage regulator U2 is connected to a 14 pin of the six inverter U1, 1 pin and 10 pin of the six inverter U1 are connected to an anode of the electrolytic capacitor C5, 2 pin and 3 pin of the six inverter U1 are connected to one end of the resistor R3, 4 pin of the six inverter U1 is connected to one end of the resistor R4, 7 pin of the six inverter U1 is grounded, 11 pin and 12 pin of the six inverter U1 are connected to one end of the resistor R2, another end of the resistor R2 is connected to one end of the adjustable resistor VR1, 13 pin of the six inverter U1 is connected to one end of the electrolytic capacitor C7, another end of the six inverter U7 is connected to one end of the resistor R5, and another end of the adjustable resistor R4 is connected to the other end of the resistor R4, and the signal is amplified by the other end of the resistor R4.
In one embodiment of the disclosure, the signal amplifying circuit includes a triode V1, a triode V2, a resistor R5 and a resistor R6, one end of the resistor R5 and one end of the resistor R6 are both connected between the direct current power supply DC and the voltage stabilizer U2, the other end of the resistor R5 is both connected with the power supply voltage transformation circuit and the c pole of the triode V1, the e pole of the triode V1 is grounded, the b pole of the triode V1 is connected with the other end of the resistor R3, the other end of the resistor R6 is both connected with the power supply voltage transformation circuit and the c pole of the triode V2, the e pole of the triode V2 is grounded, and the b pole of the triode V2 is connected with the other end of the resistor R4.
In one embodiment of the disclosure, the power transformation circuit includes a field effect transistor V3, a field effect transistor V4, a field effect transistor V5, a field effect transistor V6, and a power transformer T2, wherein an S pole of the field effect transistor V3 and an S pole of the field effect transistor V5 are both connected between the DC power supply DC and the voltage regulator U2, the S pole of the field effect transistor V4 and the S pole of the field effect transistor V6 are respectively grounded, the G pole of the field effect transistor V3 and the G pole of the field effect transistor V4 are connected and then connected with a c pole of the triode V1, the G pole of the field effect transistor V5 and the G pole of the field effect transistor V6 are connected and then connected with a c pole of the triode V2, a D pole of the field effect transistor V3 and a D pole of the field effect transistor V4 are connected and then connected with a first contact of an input terminal of the power transformer T2, and the D pole of the field effect transistor V5 and the D pole of the field effect transistor V6 are connected with an output terminal of the power transformer T2.
In one embodiment of the present disclosure, a fuse F1 is connected between the direct current power supply DC and the voltage regulator U2.
In one embodiment of the disclosure, the voltage stabilizing circuit further includes an electrolytic capacitor C2, wherein an anode of the electrolytic capacitor C2 is connected between the fuse F1 and the voltage stabilizer U2, and a cathode of the electrolytic capacitor C2 is grounded.
The short-circuit resistance testing method of the voltage-regulating rectifier transformer comprises the short-circuit resistance testing system of the voltage-regulating rectifier transformer;
the method comprises the following steps:
s1, switching on the isolating switch QS1 and the isolating switch QS2 respectively;
s2, adjusting the values of the reactor L1, the resistor R1 and the capacitor C1 to meet the short-circuit current required by short-circuit test; the current of the branch where the reactor L1 is located is i1, the current of the branch where the resistor R1 is located is i2, and the current of the branch where the voltage-regulating rectifier transformer T1 is located is i3, then i3=i1+i2;
s3, switching on and switching off the breaker QF1 according to the passing time of the required short-circuit current;
s4, respectively switching off the isolating switch QS1 and the isolating switch QS 2;
and S5, measuring the reactance value of the voltage-regulating rectifier transformer T1.
Compared with the prior art, the invention has the beneficial effects that: the test of the short-circuit resistance of the voltage-regulating rectifier transformer can improve the test capacity, is convenient to operate, can be tested only in the existing operation mode, can also use a direct-current power supply to provide a test power supply, and does not need the parallel operation control of a system and a generator; active power and reactive power of the system and the generator are reduced, and reactive power is provided by a branch where a resistor R1 and a capacitor C1 are positioned; noise interference of the generator can be avoided after the generator is not used.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic block diagram of a system for testing the short-circuit resistance of a voltage regulating rectifier transformer according to some embodiments of the present invention.
Fig. 2 is a schematic block diagram of an inverter T0 according to some embodiments of the invention.
Fig. 3 is a schematic circuit diagram of an inverter T0 according to some embodiments of the invention.
Fig. 4 is a schematic circuit diagram of a short-circuit resistance test system of a voltage regulating rectifier transformer according to some embodiments of the present invention.
Detailed Description
Hereinafter, only certain exemplary embodiments are briefly described. As will be recognized by those of skill in the pertinent art, the described embodiments may be modified in various different ways without departing from the spirit or scope of the present invention. Accordingly, the drawings and description are to be regarded as illustrative in nature and not as restrictive.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, or orientations or positional relationships conventionally placed in use of the product of the present invention, or orientations or positional relationships conventionally understood by those skilled in the art, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
Furthermore, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally formed; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
As shown in fig. 1, the embodiment provides a short-circuit resistance test system of a voltage-regulating rectifier transformer, which comprises a direct-current power supply DC, and an inverter T0 connected to the direct-current power supply DC; the input end of the input circuit is connected with the output end of the inverter T0; the input end of the voltage regulating rectifier transformer T1 is connected with the output end of the input circuit; the input end of the short circuit testing circuit is connected with the output end of the voltage regulating rectifier transformer T1; the input circuit comprises a disconnecting switch QS1, a reactor L1, a disconnecting switch QS2, a resistor R1, a capacitor C1 and a breaker QF1;
when the voltage-regulating rectifier transformer T1 is single-phase, the one-phase output branch of the inverter T0: one phase output end of the inverter T0 is connected with the input end of the voltage regulating rectifier transformer T1 and one end of the isolating switch QS2 through a breaker QF1, the isolating switch QS1 and the reactor L1; the other end of the isolating switch QS2 is connected with one end of a capacitor C1 through a resistor R1, and the other end of the capacitor C1 is grounded;
when the voltage regulating rectifier transformer T1 is three-phase, each phase of output branch of the inverter T0: each phase output end of the inverter T0 is connected with the input end of the voltage regulating rectifier transformer T1 and one end of the isolating switch QS2 through a breaker QF1, the isolating switch QS1 and the reactor L1; the other end of the isolating switch QS2 is connected with one end of a capacitor C1 through a resistor R1, and the other end of the capacitor C1 is grounded;
the short circuit test circuit is used for carrying out short circuit test.
It should be understood that in the above description: the circuit breaker QF1, the isolating switch QS1 and the reactor L1 are sequentially connected in series to serve as a branch, and the reactor L1 is mainly used for adjusting the current of the branch where the reactor L1 is located, namely adjusting the short-circuit current;
the isolating switch QS2, the resistor R1 and the capacitor C1 are sequentially connected in series to serve as a branch, and the resistor R1 and the capacitor C1 are mainly used for adjusting current of the branch where the resistor R1 and the capacitor C1 are located, namely short-circuit current; the branch circuit is used as a discharge circuit to improve the test capacity;
the short-circuit test circuit in this embodiment may use the circuit configuration of the following embodiment, or may use an existing conventional short-circuit test device.
In some embodiments, as shown in fig. 1 and 4, the short circuit test circuit includes a disconnecting switch QS3, a circuit breaker QF2, and a reactor L2;
when the voltage-regulating rectifier transformer T1 is single-phase, the voltage-regulating rectifier transformer T1 has one phase output branch: one phase output end of the voltage regulating rectifier transformer T1 is connected with the reactor L2 through the isolating switch QS3 and the breaker QF2 and then grounded;
when the voltage-regulating rectifier transformer T1 is three-phase, each phase of output branch of the voltage-regulating rectifier transformer T1: each phase output end of the voltage regulating rectifier transformer T1 is connected with the reactor L2 through the isolating switch QS3 and the breaker QF2 and then grounded.
In this embodiment, it should be understood that in the above description: the isolating switch QS3, the breaker QF2 and the reactor L2 are sequentially connected in series to serve as a branch, and the reactor L2 is mainly used for adjusting current of the branch where the reactor L2 is located, namely short-circuit current.
In some embodiments, as shown in fig. 2, the inverter T0 includes a voltage stabilizing circuit, a signal generating circuit, a signal amplifying circuit, and a power transforming circuit, the direct current power DC is connected to the voltage stabilizing circuit, the signal amplifying circuit, and the power transforming circuit, respectively, the voltage stabilizing circuit is connected to the signal generating circuit, the signal generating circuit is connected to the signal amplifying circuit, and the signal amplifying circuit is connected to the power transforming circuit.
In some embodiments, as shown in fig. 2 and 3, the voltage stabilizing circuit includes a voltage stabilizer U2, a capacitor C3 and a capacitor C4, wherein the output end of the direct current power supply DC is connected to the input end of the voltage stabilizer U2 and one end of the capacitor C3, the other end of the capacitor C3 is grounded, the output end of the voltage stabilizer U2 is connected to the signal generating circuit and one end of the capacitor C4, and the other end of the capacitor C4 is grounded.
In some embodiments, as shown in fig. 2 and 3, the signal generating circuit includes a six-phase inverter U1, a resistor R7, a resistor R2, a resistor R3, a resistor R4, an adjustable resistor VR1 and an electrolytic capacitor C5, where an output end of the voltage regulator U2 is connected to a 14 pin of the six-phase inverter U1, 1 pin and 10 pin of the six-phase inverter U1 are connected to an anode of the electrolytic capacitor C5, 2 pin and 3 pin of the six-phase inverter U1 are connected to one end of the resistor R3, 4 pin of the six-phase inverter U1 is connected to one end of the resistor R4, 7 pin of the six-phase inverter U1 is grounded, 11 pin and 12 pin of the six-phase inverter U1 are connected to one end of the resistor R2, the other end of the resistor R2 is connected to one end of the adjustable resistor VR1, 13 pin of the six-phase inverter U1 is connected to one end of the resistor R7, the other end of the resistor R7 is connected to a cathode of the electrolytic capacitor C5 and the other end of the adjustable resistor VR1, and the other end of the resistor R3 and the other end of the resistor R4 are respectively connected to the signal amplifying circuit.
In some embodiments, as shown in fig. 2 and 3, the signal amplifying circuit includes a triode V1, a triode V2, a resistor R5 and a resistor R6, one end of the resistor R5 and one end of the resistor R6 are all connected between the direct current power supply DC and the voltage stabilizer U2, the other end of the resistor R5 is all connected with the power supply voltage transformation circuit and the c pole of the triode V1, the e pole of the triode V1 is grounded, the b pole of the triode V1 is connected with the other end of the resistor R3, the other end of the resistor R6 is all connected with the c pole of the power supply voltage transformation circuit and the triode V2, the e pole of the triode V2 is grounded, and the b pole of the triode V2 is connected with the other end of the resistor R4.
In some embodiments, as shown in fig. 2 and 3, the power transformation circuit includes a fet V3, a fet V4, a fet V5, a fet V6, and a power transformer T2, wherein the S pole of the fet V3 and the S pole of the fet V5 are connected between the DC power supply DC and the voltage regulator U2, the S pole of the fet V4 and the S pole of the fet V6 are grounded respectively, the G pole of the fet V3 and the G pole of the fet V4 are connected to the c pole of the triode V1, the G pole of the fet V5 and the G pole of the fet V6 are connected to the c pole of the triode V2, the D pole of the fet V3 and the D pole of the fet V4 are connected to a first contact of an input terminal of the power transformer T2, the D pole of the fet V5 and the D pole of the fet V6 are connected to a second contact of an input terminal of the power transformer T2, and the output terminal of the power transformer T2 is connected to the input terminal of the power transformer.
In some embodiments, as shown in fig. 3, a fuse F1 is connected between the direct current power supply DC and the voltage regulator U2.
In some embodiments, as shown in fig. 3, the voltage stabilizing circuit further includes an electrolytic capacitor C2, where a positive electrode of the electrolytic capacitor C2 is connected between the fuse F1 and the voltage stabilizer U2, and a negative electrode of the electrolytic capacitor C2 is grounded.
Based on the above embodiment, the output power of the inverter T0 depends on the powers of the fet V3, fet V4, fet V5, fet V6 and power transformer T2, avoiding cumbersome transformer winding; r7 is a compensation resistor for improving the unstable oscillation frequency due to the variation of the power supply voltage; the oscillation of the circuit is completed through the charge and discharge of the capacitor C5; the inverter T0 can provide a stable test power supply for the short circuit test of the voltage regulating rectifier transformer T1.
The power transformer T2 can select corresponding phase numbers according to the phase numbers of the voltage-regulating rectifier transformer T1; other input pins of the six-phase inverter U1 can be grounded when not in use, so that other branches are prevented from being influenced; when the power transformer T2 is three-in, two-out or three-out, a corresponding resistor, triode and field effect transistor can be added between the output pin of the six inverter U1 and the input pin of the power transformer T2, and the setting relationship is as follows: the connection relation of the resistor R3, the resistor R5, the triode V1, the field effect transistor V3 and the field effect transistor V4 can be used for adding an input branch for the power transformer T2.
The model of the six inverter U1 can be CD4069;
the model of the voltage stabilizer U2 can be 78L05;
the model of transistor V1 and transistor V2 may be 2SC1815;
the types of the field effect tube V3 and the field effect tube V5 can be 2SJ471;
the types of the field effect transistor V4 and the field effect transistor V6 can be 2SK2956.
The invention also provides a short-circuit resistance testing method of the voltage-regulating rectifier transformer, which comprises the short-circuit resistance testing system of the voltage-regulating rectifier transformer in any embodiment;
the short-circuit resistance testing method of the voltage-regulating rectifier transformer comprises the following steps:
s1, switching on a disconnecting switch QS1 and a disconnecting switch QS2 respectively;
s2, adjusting the values of the reactor L1, the resistor R1 and the capacitor C1 to meet the short-circuit current required by short-circuit test; the current of the branch where the reactor L1 is located is i1, the current of the branch where the resistor R1 is located is i2, and the current of the branch where the voltage-regulating rectifier transformer T1 is located is i3, then i3=i1+i2;
s3, switching on and switching off the breaker QF1 according to the passing time of the required short-circuit current;
s4, respectively switching off the isolating switch QS1 and the isolating switch QS 2;
s5, measuring the reactance value of the voltage regulating rectifier transformer T1.
After the short circuit test circuit in the above embodiment is applied, the method for testing the short circuit resistance of the voltage-regulating rectifier transformer includes the following steps:
s1, switching on a disconnecting switch QS1, a disconnecting switch QS2 and a disconnecting switch QS 3;
s2, adjusting the values of the reactor L1, the resistor R1, the capacitor C1 and the reactor L2 to meet the short-circuit current required by short-circuit test; the current of the branch where the reactor L1 is located is i1, the current of the branch where the resistor R1 is located is i2, and the current of the branch where the voltage-regulating rectifier transformer T1 is located is i3, then i3=i1+i2;
s3, switching on and switching off the breaker QF1 and the breaker QF2 according to the passing time of the required short-circuit current;
s4, disconnecting the isolating switch QS1, the isolating switch QS2 and the isolating switch QS 3;
s5, measuring the reactance value of the voltage regulating rectifier transformer T1.
The sequence of the step S1 and the step S2 can be reversed, namely parameters can be adjusted first and then the switch is closed; the steps S1-S5 can be repeated for a plurality of times, so that the accuracy of the test is ensured; the required short-circuit current and the passing time of the required short-circuit current can be determined according to the specific parameters of the voltage-regulating rectifier transformer T1 which is actually required to be tested and the related short-circuit test standard; if the voltage and the current of each branch are required to be measured, the current transformer and the parallel voltage transformer are connected in series in the corresponding branch, or other instruments capable of measuring the current and the voltage are used, such as an electric measuring instrument like a current tester.
As shown in fig. 4, the disconnecting switch QS3 and the breaker QF2 of one branch may be closed respectively, or the disconnecting switch QS3 and the breaker QF2 of two branches may be closed respectively, or the disconnecting switch QS3 and the breaker QF2 of three branches may be closed respectively;
the single-phase short-circuit operation, the two-phase short-circuit operation and the three-phase short-circuit operation can be performed as required, so that the single-phase short-circuit test, the two-phase short-circuit test and the three-phase short-circuit test can be performed.
While the above examples describe various embodiments of the present invention, those skilled in the art will appreciate that various changes and modifications can be made to these embodiments without departing from the spirit and scope of the present invention, and that such changes and modifications fall within the scope of the present invention.
Claims (6)
1. A short-circuit resistance test system for a voltage regulating rectifier transformer, comprising:
a direct current power supply DC connected with an inverter T0;
the input end of the input circuit is connected with the output end of the inverter T0;
the input end of the voltage regulating rectifier transformer T1 is connected with the output end of the input circuit;
the input end of the short circuit testing circuit is connected with the output end of the voltage regulating rectifier transformer T1;
the input circuit comprises a disconnecting switch QS1, a reactor L1, a disconnecting switch QS2, a resistor R1, a capacitor C1 and a breaker QF1;
when the voltage-regulating rectifier transformer T1 is a single phase, a phase of the output branch of the inverter T0: a phase output end of the inverter T0 is connected with an input end of the voltage regulating rectifier transformer T1 and one end of the isolating switch QS2 through the breaker QF1, the isolating switch QS1 and the reactor L1; the other end of the isolating switch QS2 is connected with one end of the capacitor C1 through the resistor R1, and the other end of the capacitor C1 is grounded;
when the voltage-regulating rectifier transformer T1 is three-phase, each phase of output branch of the inverter T0: each phase output end of the inverter T0 is connected with the input end of the voltage regulating rectifier transformer T1 and one end of the isolating switch QS2 through the circuit breaker QF1, the isolating switch QS1 and the reactor L1; the other end of the isolating switch QS2 is connected with one end of the capacitor C1 through the resistor R1, and the other end of the capacitor C1 is grounded;
the short circuit test circuit is used for carrying out short circuit test;
the short-circuit test circuit comprises a disconnecting switch QS3, a breaker QF2 and a reactor L2;
when the voltage-regulating rectifier transformer T1 is a single phase, a phase output branch of the voltage-regulating rectifier transformer T1: one phase output end of the voltage regulating rectifier transformer T1 is connected with the reactor L2 through the isolating switch QS3 and the breaker QF2 and then grounded;
when the voltage-regulating rectifier transformer T1 is three-phase, each phase of output branch of the voltage-regulating rectifier transformer T1: each phase output end of the voltage regulating rectifier transformer T1 is connected with the reactor L2 through the isolating switch QS3 and the breaker QF2 and then grounded;
the inverter T0 comprises a voltage stabilizing circuit, a signal generating circuit, a signal amplifying circuit and a power supply transformation circuit, wherein the direct current power supply DC is respectively connected with the voltage stabilizing circuit, the signal amplifying circuit and the power supply transformation circuit, the voltage stabilizing circuit is connected with the signal generating circuit, the signal generating circuit is connected with the signal amplifying circuit, and the signal amplifying circuit is connected with the power supply transformation circuit;
the voltage stabilizing circuit comprises a voltage stabilizer U2, a capacitor C3 and a capacitor C4, wherein the output end of the direct current power supply DC is connected with the input end of the voltage stabilizer U2 and one end of the capacitor C3, the other end of the capacitor C3 is grounded, the output end of the voltage stabilizer U2 is connected with the signal generating circuit and one end of the capacitor C4, and the other end of the capacitor C4 is grounded;
the signal generating circuit comprises a six-phase inverter U1, a resistor R7, a resistor R2, a resistor R3, a resistor R4, an adjustable resistor VR1 and an electrolytic capacitor C5, wherein the output end of the voltage stabilizer U2 is connected with a 14 pin of the six-phase inverter U1, a 1 pin and a 10 pin of the six-phase inverter U1 are connected and then connected with the positive electrode of the electrolytic capacitor C5, a 2 pin and a 3 pin of the six-phase inverter U1 are connected and then connected with one end of the resistor R3, a 4 pin of the six-phase inverter U1 is connected with one end of the resistor R4, a 7 pin of the six-phase inverter U1 is grounded, an 11 pin and a 12 pin of the six-phase inverter U1 are connected and then connected with one end of the resistor R2, the other end of the resistor R2 is connected with one end of the adjustable resistor VR1, a 13 pin of the six-phase inverter U1 is connected with one end of the electrolytic capacitor R7, the other end of the resistor R7 is connected with the negative electrode of the electrolytic capacitor C5 and the other end of the adjustable resistor VR1, and the other end of the resistor R3 are connected with the signal amplifying circuit respectively.
2. The system for testing the short-circuit resistance of the voltage regulating rectifier transformer according to claim 1, wherein the signal amplifying circuit comprises a triode V1, a triode V2, a resistor R5 and a resistor R6, one end of the resistor R5 and one end of the resistor R6 are connected between the direct current power supply DC and the voltage stabilizer U2, the other end of the resistor R5 is connected with the power supply voltage converting circuit and the c pole of the triode V1, the e pole of the triode V1 is grounded, the b pole of the triode V1 is connected with the other end of the resistor R3, the other end of the resistor R6 is connected with the power supply voltage converting circuit and the c pole of the triode V2, the e pole of the triode V2 is grounded, and the b pole of the triode V2 is connected with the other end of the resistor R4.
3. The system for testing the short-circuit resistance of the voltage regulating rectifier transformer according to claim 2, wherein the power supply transformation circuit comprises a field effect transistor V3, a field effect transistor V4, a field effect transistor V5, a field effect transistor V6 and a power supply transformer T2, the S pole of the field effect transistor V3 and the S pole of the field effect transistor V5 are both connected between the direct current power supply DC and the voltage regulator U2, the S pole of the field effect transistor V4 and the S pole of the field effect transistor V6 are respectively grounded, the G pole of the field effect transistor V3 and the G pole of the field effect transistor V4 are connected and then connected with the c pole of the triode V1, the G pole of the field effect transistor V5 and the G pole of the field effect transistor V6 are connected and then connected with the c pole of the triode V2, the D pole of the field effect transistor V3 and the D pole of the field effect transistor V4 are connected and then connected with the first input terminal of the power supply transformer T2, and the second terminal of the field effect transistor V5 and the second terminal of the power supply transformer are connected with the input terminal of the power supply transformer T2.
4. The system for testing the short-circuit resistance of the voltage regulating rectifier transformer according to claim 1, wherein a fuse F1 is connected between the direct current power supply DC and the voltage stabilizer U2.
5. The system for testing the short-circuit resistance of the voltage regulating rectifier transformer according to claim 4, wherein the voltage stabilizing circuit further comprises an electrolytic capacitor C2, the positive electrode of the electrolytic capacitor C2 is connected between the fuse F1 and the voltage stabilizer U2, and the negative electrode of the electrolytic capacitor C2 is grounded.
6. A method for testing the short-circuit resistance of a voltage-regulating rectifier transformer, which is characterized by comprising the short-circuit resistance testing system of the voltage-regulating rectifier transformer according to any one of claims 1-5;
the method comprises the following steps:
s1, switching on the isolating switch QS1 and the isolating switch QS2 respectively;
s2, adjusting the values of the reactor L1, the resistor R1 and the capacitor C1 to meet the short-circuit current required by short-circuit test; the current of the branch where the reactor L1 is located is i1, the current of the branch where the resistor R1 is located is i2, and the current of the branch where the voltage-regulating rectifier transformer T1 is located is i3, then i3=i1+i2;
s3, switching on and switching off the breaker QF1 according to the passing time of the required short-circuit current;
s4, respectively switching off the isolating switch QS1 and the isolating switch QS 2;
and S5, measuring the reactance value of the voltage-regulating rectifier transformer T1.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102680861A (en) * | 2011-03-15 | 2012-09-19 | 沈阳变压器研究院股份有限公司 | System and method for testing short circuit withstanding capability of transformer or electric reactor |
| CN205120872U (en) * | 2015-11-13 | 2016-03-30 | 天津瑞能电气有限公司 | Test platform suitable for an even number converter |
| CN205539311U (en) * | 2016-04-27 | 2016-08-31 | 中国十九冶集团有限公司 | High pressure power supply loop fault detection device |
| CN108802531A (en) * | 2018-06-15 | 2018-11-13 | 黄庆利 | A kind of high-low voltage ride through test device and test method having shorted to earth function |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103969583B (en) * | 2014-05-23 | 2016-09-21 | 国家电网公司 | A kind of integrated high-low voltage ride-through test system |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102680861A (en) * | 2011-03-15 | 2012-09-19 | 沈阳变压器研究院股份有限公司 | System and method for testing short circuit withstanding capability of transformer or electric reactor |
| CN205120872U (en) * | 2015-11-13 | 2016-03-30 | 天津瑞能电气有限公司 | Test platform suitable for an even number converter |
| CN205539311U (en) * | 2016-04-27 | 2016-08-31 | 中国十九冶集团有限公司 | High pressure power supply loop fault detection device |
| CN108802531A (en) * | 2018-06-15 | 2018-11-13 | 黄庆利 | A kind of high-low voltage ride through test device and test method having shorted to earth function |
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