CN108375704B - Transformer inductance-to-wire ratio testing system and testing method - Google Patents
Transformer inductance-to-wire ratio testing system and testing method Download PDFInfo
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- CN108375704B CN108375704B CN201810078143.2A CN201810078143A CN108375704B CN 108375704 B CN108375704 B CN 108375704B CN 201810078143 A CN201810078143 A CN 201810078143A CN 108375704 B CN108375704 B CN 108375704B
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention discloses a transformer inductance-wire ratio testing system which comprises a signal source, a wire ratio testing unit, an inductance testing unit, a testing result judging unit and a testing result display unit, wherein the signal source is connected with the inductance testing unit; the signal source is used for providing a working voltage signal for the tested transformer; the line ratio testing unit is used for measuring voltage signals or current signals of a primary coil and a secondary coil of the tested transformer and comparing the measured signals of the primary coil and the secondary coil; the inductance testing unit is used for respectively measuring equivalent voltage signals or current signals of the inductance of the tested transformer and the equivalent resistance of the inductance and comparing the measured measuring signals; and the test result judging unit is used for respectively carrying out error comparison and judgment on the test results of the line ratio testing unit and the inductance testing unit. The system tests two product specifications of inductive reactance and linear ratio by the same test station, shortens the test time and the conversion time between stations, and improves the production efficiency of products.
Description
Technical Field
The invention relates to the technical field of electronic test equipment, in particular to a system and a method for testing the inductance-wire ratio of a transformer.
Background
At present, the manufacturing industry of electronic transformers separates the inductance and the line ratio into two steps for testing when testing the transformers. The small driving transformer has large production quantity and low unit price requirement, and the separate test of the inductance-to-wire ratio can affect the production efficiency and the cost of the product.
Disclosure of Invention
Based on the defects of the prior art, the invention aims to provide a system and a method for testing the inductance-to-wire ratio of a transformer, which are used for simultaneously testing the inductance and the wire ratio of a small driving transformer and shortening the whole testing time.
In order to achieve the purpose, the technical scheme of the invention is as follows:
transformer inductance line ratio test system, its characterized in that: the system comprises a signal source, a line ratio testing unit, an inductance testing unit, a testing result judging unit and a testing result display unit;
the signal source is used for providing a working voltage signal for the tested transformer;
the line ratio testing unit is used for measuring voltage signals or current signals of a primary coil and a secondary coil of the tested transformer and comparing the measured signals of the primary coil and the secondary coil;
the inductance testing unit is used for respectively measuring the equivalent voltage signal or the equivalent current signal of the tested transformer inductive reactance and the tested transformer inductance equivalent resistance loaded with the signal source signal and comparing the measured measuring signals;
the test result judging unit is used for respectively carrying out error comparison and judgment on the test results of the line ratio test module and the inductance test module according to a preset line ratio error and an inductance error;
and the test result display unit is used for displaying the test result.
Further, the line ratio testing unit comprises a primary coil signal detecting unit, a secondary coil signal detecting unit, a first signal amplifier, a second signal amplifier, a first subtraction unit and a first signal comparator, wherein the input end of the primary coil signal detecting unit is connected with the primary coil of the transformer to be tested, the output end of the primary coil signal detecting unit is connected with the input end of the first signal amplifier, the output end of the first signal amplifier is connected with the first input end of the first subtraction unit, the input end of the secondary coil signal detecting unit is connected with the secondary coil of the transformer to be tested, the output end of the secondary coil signal detecting unit is connected with the input end of the second signal amplifier, the output end of the second signal amplifier is connected with the second input end of the first subtraction unit, and the output end of the first subtraction unit is connected with the first input end of the first signal comparator, and the second input end of the first signal comparator is connected with a first error setting unit, and the output end of the first signal comparator is connected with the test result display unit.
Further, the second signal amplifier is further connected with a line ratio setting unit for setting the amplification factor of the second signal amplifier.
Further, the inductance testing unit comprises a first signal detecting unit for detecting an inductive reactance signal of the tested transformer, a second signal detecting unit for detecting an inductance equivalent resistance signal, a third signal amplifier, a fourth signal amplifier, a second subtraction operator and a second signal comparator; the output end of the first signal detection unit is connected with the input end of the third signal amplifier, the output end of the second signal detection unit is connected with the input end of the fourth signal amplifier, the output end of the third signal amplifier and the output end of the fourth signal amplifier are respectively connected with the first input end and the second input end of the second subtraction arithmetic unit, the output end of the second subtraction arithmetic unit is connected with the first input end of the second signal comparator, the second input end of the second signal comparator is connected with the second error setting unit, and the output end of the second signal comparator is connected with the test result display unit.
Furthermore, the inductance equivalent resistor is also connected with an inductance setting unit for setting the resistance value of the inductance equivalent resistor.
The test method of the transformer inductance-wire ratio test system comprises a transformer wire ratio test method, wherein the transformer wire ratio test method comprises the following steps:
the signal source provides a test signal to a primary coil and a secondary coil of the tested transformer, and the primary coil detection unit detects the primary signal and amplifies the primary signal through a first signal amplifier; the secondary coil detection unit detects a secondary signal, the amplification line ratio of a second signal amplifier is set by a line ratio setting unit, the second signal amplifier amplifies the secondary coil signal according to a set ratio, then the two signals are output to a first subtraction operator for subtraction, the difference of the two signals is calculated, and a first signal comparator compares the difference of the two signals with a preset line ratio error and outputs a test result.
Furthermore, the device also comprises a preset range of the line ratio error through the first error setting unit, and the preset range of the line ratio error is adjustable.
The test method of the transformer inductance-inductance ratio test system comprises a transformer inductance test method, wherein the transformer inductance test method comprises the following steps:
the signal source loads signals on a primary coil and an inductance equivalent resistor of the transformer, the inductance of the primary coil of the transformer is converted into a voltage signal or a current signal which can be measured by a first signal detection unit, the resistance signal on the inductance equivalent resistor is correspondingly converted into a voltage signal or a current signal which can be measured by a second signal detection unit, the resistance of the inductance equivalent resistor is adjusted by an inductance setting knob in an inductance setting module, the first signal detection unit and the second signal detection unit respectively pass through a third signal amplifier and a fourth signal amplifier and then are subjected to subtraction operation by a second subtraction operator to output the difference of the two signals, and a second signal comparator compares the difference of the two signals with an inductance error reference signal and outputs the difference to a test result display unit to display a test result.
Furthermore, the method also comprises the step of presetting the range of the inductive reactance error reference signal through a second error setting unit, and the inductive reactance error reference signal is adjustable.
The invention has the beneficial effects that: the system is used for connecting a primary coil of a product to be tested, taking out the induction voltage on the coil, comparing and operating the primary induction voltage with the induction voltage of a secondary coil, judging whether the line ratio of the product meets the specification of the product, measuring the inductive reactance of the product to be tested, comparing and operating the inductive reactance with the resistance value of an inductance equivalent resistor, and judging the inductive reactance of the product. The same test station tests two product specifications of inductive reactance and linear ratio, shortens the test time and the conversion time between stations, and improves the production efficiency of products.
Drawings
FIG. 1 is a block diagram of the structure of an embodiment of the present invention;
FIG. 2 is a block diagram of a line ratio test module according to an embodiment of the present invention;
fig. 3 is a block diagram of an inductance testing module according to an embodiment of the invention.
Detailed Description
The conception, the specific structure, and the technical effects produced by the present invention will be clearly and completely described below in conjunction with the embodiments and the accompanying drawings to fully understand the objects, the features, and the effects of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and those skilled in the art can obtain other embodiments without inventive efforts, and all embodiments are within the protection scope of the present invention.
As shown in fig. 1, the transformer inductance-to-line ratio testing system includes a signal source, a line ratio testing unit, an inductance testing unit, a testing result determining unit, and a testing result displaying unit;
the signal source is used for providing a working voltage signal for the tested transformer;
the line ratio testing unit is used for measuring voltage signals or current signals of a primary coil and a secondary coil of the tested transformer and comparing the measured signals of the primary coil and the secondary coil;
the inductance testing unit is used for respectively measuring the equivalent voltage signal or the equivalent current signal of the tested transformer inductive reactance and the tested transformer inductance equivalent resistance loaded with the signal source signal and comparing the measured measuring signals;
the test result judging unit is used for respectively carrying out error comparison and judgment on the test results of the line ratio testing unit and the inductance testing unit according to a preset line ratio error and an inductance error;
and the test result display unit is used for displaying the test result.
The embodiment comprises two parallel line ratio test units, namely a first line ratio test unit and a second line ratio test unit, wherein the two line ratio test units can respectively measure two tested transformers.
As shown in fig. 2, each line ratio testing unit includes a primary coil signal detecting unit, a secondary coil signal detecting unit, a first signal amplifier, a second signal amplifier, a first subtraction unit and a first signal comparator, wherein an input terminal of the primary coil signal detecting unit is connected to the primary coil of the transformer to be tested, an output terminal of the primary coil signal detecting unit is connected to an input terminal of the first signal amplifier, an output terminal of the first signal amplifier is connected to a first input terminal of the first subtraction unit, an input terminal of the secondary coil signal detecting unit is connected to the secondary coil of the transformer to be tested, an output terminal of the secondary coil signal detecting unit is connected to an input terminal of the second signal amplifier, an output terminal of the second signal amplifier is connected to a second input terminal of the first subtraction unit, and an output terminal of the first subtraction unit is connected to a first input terminal of the first signal comparator, and the second input end of the first signal comparator is connected with a first error setting unit, and the output end of the first signal comparator is connected with the test result display unit. The second signal amplifier is also connected with a line ratio setting unit for setting the amplification factor of the second signal amplifier.
The testing method of the line ratio testing unit comprises the following steps: the signal source is used for providing a voltage signal or a current signal for the tested transformer, the signal source provides a test signal for a primary coil and a secondary coil of the tested transformer, and the primary coil detection unit detects the primary signal and amplifies the primary signal through the first signal amplifier; meanwhile, the secondary coil detection unit detects a secondary signal, and a user can set a specification value of an amplification wire ratio of the second signal amplifier through a setting knob of the wire ratio setting unit, wherein the wire ratio setting unit can change the amplification factor of the second signal amplifier by adopting a sliding resistor, the second signal amplifier amplifies the secondary coil signal according to a set ratio, then the two signals are output to the first subtraction arithmetic unit for subtraction operation, the difference of the two signals is calculated, the user sets the error range through the error setting unit, and the first signal comparator compares the difference of the two signals with the error set by the user and outputs a test result.
As shown in fig. 3, the inductance testing unit includes a first signal detecting unit for detecting an inductive reactance signal of the tested transformer, a second signal detecting unit for detecting an inductance equivalent resistance signal, a third signal amplifier, a fourth signal amplifier, a second subtraction operator, and a second signal comparator; the output end of the first signal detection unit is connected with the input end of the third signal amplifier, the output end of the second signal detection unit is connected with the input end of the fourth signal amplifier, the output end of the third signal amplifier and the output end of the fourth signal amplifier are respectively connected with the first input end and the second input end of the second subtraction arithmetic unit, the output end of the second subtraction arithmetic unit is connected with the first input end of the second signal comparator, the second input end of the second signal comparator is connected with the second error setting unit, and the output end of the second signal comparator is connected with the test result display unit. The inductance equivalent resistor is also connected with an inductance setting unit for setting the resistance value of the inductance equivalent resistor.
The test method of the inductance test unit comprises the following steps: the signal source loads signals on a primary coil and an inductance equivalent resistor of the transformer, the inductive reactance of the primary coil of the transformer is converted into a voltage signal or a current signal which can be measured by a first signal detection unit, the resistance signal on the inductance equivalent resistor is correspondingly converted into a voltage signal or a current signal which can be measured by a second signal detection unit, a user can adjust the resistance of the inductance equivalent resistor through an inductance setting knob in an inductance setting unit, the first signal detection unit and the second signal detection unit respectively pass through a third signal amplifier and a fourth signal amplifier and then undergo subtraction operation through a second subtraction arithmetic unit to output the difference of the two signals, and a second signal comparator compares the difference of the two signals with an error reference signal and outputs the difference to a test result display unit to display a test result.
The test result display module can display the test result by using the LED lamps with different colors respectively.
It should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and the present invention is not limited to the above-mentioned embodiments, and the present invention shall fall within the protection scope of the present invention as long as the technical effects of the present invention are achieved by the same means.
Claims (7)
1. Transformer inductance line ratio test system, its characterized in that: the system comprises a signal source, a line ratio testing unit, an inductance testing unit, a testing result judging unit and a testing result display unit;
the signal source is used for providing a working voltage signal for the tested transformer;
the line ratio testing unit is used for measuring voltage signals or current signals of a primary coil and a secondary coil of the tested transformer and comparing the measured signals of the primary coil and the secondary coil;
the inductance testing unit is used for respectively measuring the equivalent voltage signal or the equivalent current signal of the tested transformer inductive reactance and the tested transformer inductance equivalent resistance loaded with the signal source signal and comparing the measured measuring signals;
the test result judging unit is used for respectively carrying out error comparison and judgment on the test results of the line ratio testing unit and the inductance testing unit according to a preset line ratio error and an inductance error;
the test result display unit is used for displaying the test result;
wherein, the line ratio testing unit comprises a primary coil signal detecting unit, a secondary coil signal detecting unit, a first signal amplifier, a second signal amplifier, a first subtraction unit and a first signal comparator, the input end of the primary coil signal detecting unit is connected with the primary coil of the transformer to be tested, the output end of the primary coil signal detecting unit is connected with the input end of the first signal amplifier, the output end of the first signal amplifier is connected with the first input end of the first subtraction unit, the input end of the secondary coil signal detecting unit is connected with the secondary coil of the transformer to be tested, the output end of the secondary coil signal detecting unit is connected with the input end of the second signal amplifier, the output end of the second signal amplifier is connected with the second input end of the first subtraction unit, the output end of the first subtraction unit is connected with the first input end of the first signal comparator, the second input end of the first signal comparator is connected with a first error setting unit, and the output end of the first signal comparator is connected with the test result display unit;
the inductance testing unit comprises a first signal detecting unit for detecting an inductance signal of the tested transformer, a second signal detecting unit for detecting an inductance equivalent resistance signal, a third signal amplifier, a fourth signal amplifier, a second subtraction arithmetic unit and a second signal comparator; the output end of the first signal detection unit is connected with the input end of the third signal amplifier, the output end of the second signal detection unit is connected with the input end of the fourth signal amplifier, the output end of the third signal amplifier and the output end of the fourth signal amplifier are respectively connected with the first input end and the second input end of the second subtraction arithmetic unit, the output end of the second subtraction arithmetic unit is connected with the first input end of the second signal comparator, the second input end of the second signal comparator is connected with the second error setting unit, and the output end of the second signal comparator is connected with the test result display unit.
2. The transformer inductance-to-wire ratio testing system of claim 1, wherein: the second signal amplifier is also connected with a line ratio setting unit for setting the amplification factor of the second signal amplifier.
3. The transformer inductance-to-wire ratio testing system of claim 1, wherein: the inductance equivalent resistor is also connected with an inductance setting unit for setting the resistance value of the inductance equivalent resistor.
4. The method for testing the inductance-to-wire ratio test system of the transformer according to claim 2, comprising a transformer wire ratio test method, wherein the transformer wire ratio test method comprises:
the signal source provides a test signal to a primary coil and a secondary coil of the tested transformer, and the primary coil detection unit detects the primary signal and amplifies the primary signal through a first signal amplifier; the secondary coil detection unit detects a secondary signal, the amplification line ratio of a second signal amplifier is set by a line ratio setting unit, the second signal amplifier amplifies the secondary coil signal according to a set ratio, then the two signals are output to a first subtraction operator for subtraction, the difference of the two signals is calculated, and a first signal comparator compares the difference of the two signals with a preset line ratio error and outputs a test result.
5. The method for testing the inductance-to-wire ratio of the transformer of claim 4, wherein: the device also comprises a preset range of the line ratio error through the first error setting unit, and the preset range of the line ratio error is adjustable.
6. The method for testing the inductance-to-wire ratio of the transformer according to claim 1, comprising a transformer inductance testing method, wherein the transformer inductance testing method comprises: the signal source loads signals on a primary coil and an inductance equivalent resistor of the transformer, the inductance of the primary coil of the transformer is converted into a voltage signal or a current signal which can be measured by a first signal detection unit, the resistance signal on the inductance equivalent resistor is correspondingly converted into a voltage signal or a current signal which can be measured by a second signal detection unit, the resistance of the inductance equivalent resistor is adjusted by an inductance setting knob in an inductance setting module, the first signal detection unit and the second signal detection unit respectively pass through a third signal amplifier and a fourth signal amplifier and then are subjected to subtraction operation by a second subtraction operator to output the difference of the two signals, and a second signal comparator compares the difference of the two signals with an inductance error reference signal and outputs the difference to a test result display unit to display a test result.
7. The method of claim 6, wherein the testing system comprises: the method also comprises the step of presetting the range of the inductive reactance error reference signal through a second error setting unit, and the inductive reactance error reference signal is adjustable.
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| CN201810078143.2A CN108375704B (en) | 2018-01-26 | 2018-01-26 | Transformer inductance-to-wire ratio testing system and testing method |
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| CN2601406Y (en) * | 2003-01-21 | 2004-01-28 | 于冠学 | Computer controllet transformer test bench |
| CN104316808B (en) * | 2014-11-17 | 2017-05-31 | 国家电网公司 | A kind of method and system for detecting transformer winding fault |
| CN106199263B (en) * | 2016-06-28 | 2019-03-15 | 杭州电力设备制造有限公司 | A kind of on-line monitoring method and system of transformer |
| CN106707028A (en) * | 2016-12-30 | 2017-05-24 | 广东电网有限责任公司惠州供电局 | Transformer short-circuit impedance on-line monitoring method and device |
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