CN203204085U - A comprehensive testing system used for casually inspecting the quality of a distribution transformer - Google Patents

A comprehensive testing system used for casually inspecting the quality of a distribution transformer Download PDF

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Publication number
CN203204085U
CN203204085U CN 201320090292 CN201320090292U CN203204085U CN 203204085 U CN203204085 U CN 203204085U CN 201320090292 CN201320090292 CN 201320090292 CN 201320090292 U CN201320090292 U CN 201320090292U CN 203204085 U CN203204085 U CN 203204085U
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CN
China
Prior art keywords
circuit
quality
unit
measuring unit
voltage
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CN 201320090292
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Chinese (zh)
Inventor
尹奎龙
孙学武
任炜
李炯
周健
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山东电力集团公司物资供应公司
上海思创电器设备有限公司
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Priority to CN 201320090292 priority Critical patent/CN203204085U/en
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Publication of CN203204085U publication Critical patent/CN203204085U/en

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Abstract

The utility model discloses a comprehensive testing system used for casually inspecting the quality of a distribution transformer. The comprehensive testing system comprises an industrial control computer and measuring units. The industrial control computer comprises a processing unit and control interfaces. A processor used for processing measured data in the measuring units and a memory used for storing the measured data are disposed in the processing unit. An operating unit comprises a display and a keyboard. The measuring units comprise an insulation resistance measuring unit, a dielectric loss measuring unit, a direct-current resistance measuring unit, and a transformer ratio measuring unit. The measuring units are connected with the processing unit through the control interfaces. The comprehensive testing system has beneficial effects that the measuring units are controlled by the industrial control computer so that a measuring process is greatly simplified and measuring efficiency is increased, that the comprehensive testing system with accurate measurement is capable of immediately acquiring a measured result and generating measured data, and that the comprehensive testing system has characteristics of visualized operation, a friendly human-computer interface, and easy post-retrieval of measured data.

Description

A kind of integrated test system for the substation transformer sampling check for quality

Technical field

The utility model relates to a kind of sampling observation system, particularly a kind of integrated test system for the substation transformer sampling check for quality.

Background technology

Electric system is made up of various electrical equipments, and as generator, power transformer, voltage current transformer, isolating switch, sleeve pipe etc., these equipment whether safe operation are directly connected to the safety of whole electric system.

Large-scale substation transformer in the electric system is when carrying out sampling check for quality, usually need carry out multinomial electrical test project, the instrument that test relates to is various in style, need at the trial various big and small instruments are carried to the scene, whenever do a test then and all need to change instrument and test connection, operating process is loaded down with trivial details and make mistakes easily, and test findings also is not easy to unified filing, and further analyzes and provide test report.In order further to improve the work efficiency of site test, develop a kind of task of top priority that has become the electrical test field for the comprehensive electrical test system of substation transformer sampling check for quality.

The utility model content

The purpose of this utility model is to provide a kind of integrated test system for the substation transformer sampling check for quality, by adopting installation testing unit on each instrument, and adopt industrial computer that these test cells are carried out same control, overcome in the existing measuring technology that program is numerous and diverse, quantities greatly and the deficiency of easily makeing mistakes, thereby realize the purpose of this utility model.

The technical matters that the utility model solves can realize by the following technical solutions:

A kind of integrated test system for the substation transformer sampling check for quality comprises an industrial computer and one or more measuring unit that is connected with this industrial computer, wherein:

Industrial computer comprises a processing unit, be used for the operating unit of this processing unit of control and one or more is used for the control interface that is connected with measuring unit, be provided with in the processing unit for the treatment of the processor of measurement data in the measuring unit and the storer that is used for storage of measurement data, operating unit comprises display and keyboard;

Measuring unit comprises insulation resistance, dielectric loss, direct current resistance, transformation ratio measuring unit, and each measuring unit is connected with processing unit by control interface respectively.

In a preferred embodiment of the present utility model, the insulation measurement unit comprises built-in high voltage direct current generator and insulation resistance measurement circuit, wherein:

High voltage direct current generator inside is provided with microprocessor, and processing unit is connected with this microprocessor, is used for insulation resistance measurement circuit is produced high voltage;

Insulation resistance measurement circuit comprises trial voltage metering circuit, tested tension measuring circuit.

In a preferred embodiment of the present utility model, the dielectric loss measurement unit comprises variable-frequency power sources, AC boosting device and dielectric loss measurement circuit, wherein:

Variable-frequency power sources is built-in, and it is for generation of the experiment power supply of Frequency Adjustable pressure regulation, and this variable-frequency power sources adopts the SPWM modulation circuit;

The AC boosting device is for generation of adjustable test high pressure;

The dielectric loss measurement circuit is by constituting for first loop of logical standard capacitance loop current, the tertiary circuit that is used for leading to second loop of tested loop circuit and being used for the measurement of reversal connection line.

Need to prove that especially the power supply output area of AC boosting device is 0.5KW~10KW.

In a preferred embodiment of the present utility model, the direct current resistance measuring unit comprises dc constant voltage constant current source, dc resistance measurement circuit, wherein:

The output current scope of dc constant voltage constant current source is 0.5A~10A;

Dc resistance measurement circuit is made of current measurement circuit, voltage measurement circuit.

In a preferred embodiment of the present utility model, the transformation ratio measuring unit comprises experiment power supply, transformation ratio metering circuit, wherein:

The voltage of experiment power supply output fixed frequency;

The transformation ratio metering circuit is used for elementary, the secondary voltage of tested transformer are carried out real-time sampling.

In a preferred embodiment of the present utility model, the control interface of industrial computer is serial line interface.

In a preferred embodiment of the present utility model, measuring unit also comprises three-phase electric weight, load ratio bridging switch measuring unit.

In a preferred embodiment of the present utility model, also be provided with on the processing unit for the external interface of realizing exchanges data, Long-distance Control.

The beneficial effects of the utility model are:

By each measuring unit of the unified control of industrial computer, greatly simplified measuring process, improve and measure efficient; Measure precisely and also can draw measurement result immediately, and generate measurement data, operation is directly perceived, man-machine interface close friend, and it is convenient that the later stage is transferred measurement data.

Description of drawings

Fig. 1 is a kind of integrated test system synoptic diagram in the specific implementation for the substation transformer sampling check for quality described in the utility model.

Fig. 2 is a kind of integrated test system industrial computer synoptic diagram in the specific implementation for the substation transformer sampling check for quality described in the utility model.

Fig. 3 is a kind of integrated test system high voltage direct current generator synoptic diagram in the specific implementation for the substation transformer sampling check for quality described in the utility model.

Fig. 4 is a kind of integrated test system insulation resistance measurement circuit synoptic diagram in the specific implementation for the substation transformer sampling check for quality described in the utility model.

Fig. 5 is a kind of integrated test system medium loss measurement unit synoptic diagram in the specific implementation for the substation transformer sampling check for quality described in the utility model.

Fig. 6 is a kind of integrated test system variable-frequency power sources synoptic diagram in the specific implementation for the substation transformer sampling check for quality described in the utility model.

Fig. 7 is a kind of SPWM modulation circuit synoptic diagram in the specific implementation that adopts for the integrated test system medium loss measurement unit of substation transformer sampling check for quality described in the utility model.

Fig. 8 is a kind of integrated test system medium loss measurement circuit synoptic diagram in the specific implementation for the substation transformer sampling check for quality described in the utility model.

Fig. 9 is a kind of integrated test system dc constant voltage constant current source synoptic diagram in the specific implementation for the substation transformer sampling check for quality described in the utility model.

Figure 10 is a kind of integrated test system dc resistance measurement circuit synoptic diagram in the specific implementation for the substation transformer sampling check for quality described in the utility model.

Figure 11 is the experiment power supply synoptic diagram in the specific implementation of a kind of integrated test system transformation ratio measuring unit for the substation transformer sampling check for quality described in the utility model.

Figure 12 is a kind of integrated test system transformation ratio metering circuit synoptic diagram in the specific implementation for the substation transformer sampling check for quality described in the utility model.

Figure 13 is the synoptic diagram of a kind of integrated test system three phase electrical unit for the substation transformer sampling check for quality described in the utility model.

Figure 14 is the synoptic diagram of a kind of integrated test system load ratio bridging switch measuring unit for the substation transformer sampling check for quality described in the utility model.

Embodiment

For technological means, creation characteristic that the utility model is realized, reach purpose and effect is easy to understand, below in conjunction with embodiment, further set forth the utility model.

As shown in Figure 1, a kind of integrated test system for the substation transformer sampling check for quality described in the utility model comprises an industrial computer and is connected with a plurality of measuring units by serial line interface, in the present embodiment, these measuring units are respectively insulation measurement unit, dielectric loss measurement unit, direct current resistance measuring unit, transformation ratio measuring unit, three phase electrical unit and load ratio bridging switch measuring unit, wherein, the insulation measurement unit comprises high voltage direct current generator and insulation resistance measurement circuit; The dielectric loss measurement unit comprises variable-frequency power sources and dielectric loss measurement circuit; The direct current resistance measuring unit comprises dc constant voltage constant current source and dc resistance measurement circuit; The transformation ratio measuring unit comprises experiment power supply and transformation ratio metering circuit.

As shown in Figure 2, industrial computer is used for accepting operational order, handle the work of each measuring unit by serial line interface, and preserve, analyze or the output measurement result, it comprises the processor for the treatment of measurement data in the present embodiment, this processor is provided with a plurality of serial line interfaces, is used for being connected with measuring unit; Be connected with a storer on the processor, this storer is used for all kinds of measurement data of storage, measurement result, and the handled easily personnel read, access; In addition, also be provided with external interface on the processor, as USB interface or serial line interface, be used for realizing Long-distance Control or exchanges data.

LCD and keyboard as operating unit are connected with processor, and operating personnel can see measurement situation and the data of each measuring unit intuitively by the prompting of the man-machine interface in the LCD, and by the Keyboard Control industrial computer.

The insulation measurement unit comprises a built-in high voltage direct current generator and insulation resistance measurement circuit as one of measuring unit that is connected with industrial computer.

As shown in Figure 3, built-in high voltage direct current generator produces dc high voltage when being used for measuring in the insulation measurement unit, it comprises microprocessor, pulse width modulation inverter, high voltage package and current rectifying and wave filtering circuit, receive the industrial computer instruction by serial line interface, through after the microprocessor processes, the transistor of pulse width modulation inverter works on off state, skips the duty of regulating impulse circuit and recently regulates output voltage; The low-voltage coil of high voltage package is received in the output of pulse width modulation inverter, induces the high pressure of pulsation after vibrating at high-tension coil, exports behind rectifying and wave-filtering.。

In addition, this high voltage direct current generator also comprises a feedback circuit, and the high-tension current by will output feeds back to a discharge circuit, and with this feedback current with through the relative pulse width modulation inverter of recently adjusting of reference current after the D/A conversion.

As shown in Figure 4, insulation resistance measurement circuit is formed with microprocessor, D/A change-over circuit and the two paths of signals of industrial computer communication by one, in the two paths of signals, one drive test amount trial voltage, the electric current of one drive test amount test specimen, after becoming digital signal by D/A converter then, calculate the measured resistance value by microprocessor.

As shown in Figure 5, the dielectric loss measurement unit mainly comprises a variable-frequency power sources and dielectric loss measurement circuit, and in addition, this variable-frequency power sources also is connected with an AC boosting device.

As shown in Figure 6, variable-frequency power sources produces the experiment power supply of Frequency Adjustable pressure regulation when being used for the dielectric loss test, it comprises microprocessor, SPWM signal generator, IPM power model, LC low-pass filter circuit and feedback circuit, wherein, microprocessor connects by serial line interface and industrial computer, the SPWM signal generator is subjected to microprocessor control to produce variable-frequency power sources, through exporting behind IPM power model, the LC low-pass filter circuit; Feedback circuit feeds back to the SPWM signal generator with the result who draws after output voltage and the reference voltage of changing through D/A are contrasted, and makes its output burning voltage.

As shown in Figure 7, the SPWM modulation circuit that arranges in the SPWM signal generator comprises sine wave signal generator and modulated triangular wave generator, wherein, sine wave signal generator is for generation of the standard sine signal of Frequency Adjustable amplitude modulation, regulate D/A converter output and can regulate sinusoidal wave amplitude, regulate swept-frequency signal and can regulate sinusoidal wave frequency; The signal of sine wave signal and triangular-wave generator is input to comparer jointly and modulates then, and the output of comparer is exactly the pulse-width signal of being modulated by sine wave signal.

As shown in Figure 8, the dielectric loss measurement circuit is mainly used in the transformer dielectric loss measurement and uses, it connects three road signals by a microprocessor and forms, this three road signal comprises first via measurement standard capacitor loop electric current, the tested loop current of the second drive test amount, and Third Road is used for measuring when the reversal connection line is measured on high-tension side electric current; First, second road signal through program control amplification, low-pass filter circuit after, become digital signal by AD converter respectively after, carry out electric capacity and the dielectric loss value that FFT calculates test specimen by microprocessor; Behind the program control amplification of Third Road signal process, the low-pass filter circuit, by modulators modulate, and by the detuner demodulation, and again through reaching microprocessor after low-pass filtering, the AD conversion.

As shown in Figure 9, the output area of the dc constant voltage constant current source in the direct current resistance measuring unit is 0.5A~10A, it comprises one by serial line interface and industrial computer microprocessor linked, the pulse-duration modulation signal generator that is connected with this microprocessor, power driving circuit, current rectifying and wave filtering circuit and error comparator circuit, wherein, microprocessor is used for receiving the instruction that industrial computer sends, in the present embodiment, the dc constant voltage constant current source adopts pulse modulation technology (PWM), make output current keep stable by modulation signal generator regulating impulse width, this pulse-duration modulation signal generator for generation of, the pulse-width signal that keeps outputting current steadily, microprocessor is regulated the output current size by D/A converter.The error comparator circuit compares output current signal and benchmark, and error signal is used for pulse-width modulation circuit, makes output current reach dynamic stability.

As shown in figure 10, the dc resistance measurement circuit in the leakage resistance measuring unit is built-in, and it is mainly used in DC Resistance of Transformer and measures use, is made up of two paths of signals, and one the tunnel is used for measuring test current, and another road is used for measuring the voltage of test product end; Behind the circuit such as the amplification of two paths of signals process, filtering, deliver to AD converter respectively and become digital signal, calculated the dc resistance of test specimen again by microprocessor according to Ohm law.

As shown in figure 11, the experiment power supply in the transformation ratio measuring unit is used for transformer voltage ratio and measures use, output fixed voltage frequency; This experiment power supply comprises that it starts or close the output of sinusoidal signal generator as requested for the microprocessor of the steering order that receives embedded calculating, and whether the monitoring output voltage is normal.In case overcurrent condition is arranged, starts defencive function immediately.

As shown in figure 12, the transformation ratio metering circuit in the transformation ratio measuring unit is built-in, and it is used for transformer voltage ratio and measures use.This transformation ratio metering circuit is carried out synchronized sampling to primary and secondary voltage respectively, obtain two groups of signals, and calculated by its inner microprocessor that arranges with the electrotechnics principle, amplitude can draw polarity or the group of transformer than the transformation ratio that is exactly transformer by measured phase angle.

As shown in figure 13, built-in three phase electrical unit is mainly used in transformer loss and the low pressure short-circuit impedance is measured use, respectively three-phase voltage, current signal are carried out real-time synchronized sampling, calculated by microprocessor with the electrotechnics principle, draw the measurement result of electric weight such as three-phase voltage, electric current, active power, power factor, frequency, can realize the measurement of transformer noload losses, load loss and low pressure short-circuit impedance.

As shown in figure 14, the load ratio bridging switch measuring unit is used for the on-load tap changers of transformers electric property and measures use, it is controlled by microprocessor, adopted the high speed, high resolution AD converter, to the collection of tap changer for three phases state synchronized and wave recording, can measure parameters such as the excessive time of load ratio bridging switch, excessive waveform, excessive resistance and three-phase synchronism.

The utility model adopts each measuring unit of the unified control of an industrial computer, is very easy to operating personnel's operations, and man-machine interface close friend measures accurately fast, can arrive measurement result fast; The measurement data that draws is production report according to the actual requirements, and whole measuring process efficient is very high.

More than show and described ultimate principle of the present utility model and principal character and advantage of the present utility model.The technician of the industry should understand; the utility model is not restricted to the described embodiments; that describes in above-described embodiment and the instructions just illustrates principle of the present utility model; under the prerequisite that does not break away from the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall in claimed the utility model scope.The claimed scope of the utility model is defined by appending claims and equivalent thereof.

Claims (9)

1. an integrated test system that is used for the substation transformer sampling check for quality is characterized in that, comprises an industrial computer and one or more measuring unit that is connected with this industrial computer, wherein:
Described industrial computer comprises a processing unit, be used for the operating unit of this processing unit of control and one or more is used for the control interface that is connected with measuring unit, be provided with in the described processing unit for the treatment of the processor of measurement data in the described measuring unit and the storer that is used for storage of measurement data, described operating unit comprises display and keyboard;
Described measuring unit comprises insulation resistance, dielectric loss, direct current resistance, transformation ratio measuring unit, and each measuring unit is connected with processing unit by control interface respectively.
2. a kind of integrated test system for the substation transformer sampling check for quality as claimed in claim 1 is characterized in that, described insulation measurement unit comprises built-in high voltage direct current generator and insulation resistance measurement circuit, wherein:
Described high voltage direct current generator inside is provided with microprocessor, and described processing unit is connected with this microprocessor, is used for described insulation resistance measurement circuit is produced high voltage;
Described insulation resistance measurement circuit comprises trial voltage metering circuit, tested tension measuring circuit.
3. a kind of integrated test system for the substation transformer sampling check for quality as claimed in claim 1 is characterized in that, described dielectric loss measurement unit comprises variable-frequency power sources, AC boosting device and dielectric loss measurement circuit, wherein:
Described variable-frequency power sources is built-in, and it is for generation of the experiment power supply of Frequency Adjustable pressure regulation, and this variable-frequency power sources adopts the SPWM modulation circuit;
Described AC boosting device is for generation of adjustable test high pressure;
Described dielectric loss measurement circuit is by constituting for first loop of logical standard capacitance loop current, the tertiary circuit that is used for leading to second loop of tested loop circuit and being used for the measurement of reversal connection line.
4. a kind of integrated test system for the substation transformer sampling check for quality as claimed in claim 3 is characterized in that, the power supply output area of described AC boosting device is 0.5KW~10KW.
5. a kind of integrated test system for the substation transformer sampling check for quality as claimed in claim 1 is characterized in that, described direct current resistance measuring unit comprises dc constant voltage constant current source, dc resistance measurement circuit, wherein:
The output current scope of described dc constant voltage constant current source is 0.5A~10A;
Described dc resistance measurement circuit is made of current measurement circuit, voltage measurement circuit.
6. a kind of integrated test system for the substation transformer sampling check for quality as claimed in claim 1 is characterized in that, described transformation ratio measuring unit comprises experiment power supply, transformation ratio metering circuit, wherein:
The voltage of described experiment power supply output fixed frequency;
Described transformation ratio metering circuit is used for elementary, the secondary voltage of tested transformer are carried out real-time sampling.
7. a kind of integrated test system for the substation transformer sampling check for quality as claimed in claim 1 is characterized in that the control interface of described industrial computer is serial line interface.
8. a kind of integrated test system for the substation transformer sampling check for quality as claimed in claim 1 is characterized in that, described measuring unit also comprises three-phase electric weight, load ratio bridging switch measuring unit.
9. a kind of integrated test system for the substation transformer sampling check for quality as claimed in claim 1 is characterized in that, also is provided with on the described processing unit for the external interface of realizing exchanges data, Long-distance Control.
CN 201320090292 2013-02-27 2013-02-27 A comprehensive testing system used for casually inspecting the quality of a distribution transformer CN203204085U (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103675462A (en) * 2013-12-17 2014-03-26 厦门红相电力设备股份有限公司 Small-current lightning impulse grounding impedance testing method and device
CN104090168A (en) * 2014-07-24 2014-10-08 国网浙江宁波市鄞州区供电公司 Transformer direct-current resistance and no-load voltage ratio testing device
CN104698319A (en) * 2015-03-20 2015-06-10 国家电网公司 Comprehensive tester for transformer parameters
CN105021905A (en) * 2014-04-15 2015-11-04 国家电网公司 Transformer direct current resistance and transformer group tester
CN105470919A (en) * 2015-12-10 2016-04-06 成都德善能科技有限公司 Safety switch-on system for 10kV step-down transformer
CN105470941A (en) * 2015-12-10 2016-04-06 成都德善能科技有限公司 Safety switch-on apparatus for 10kv step-down transformer
CN105467878A (en) * 2015-12-10 2016-04-06 成都德善能科技有限公司 A 10kv voltage transformer for safe closing
CN105911363A (en) * 2016-05-10 2016-08-31 国网江苏省电力公司电力科学研究院 Transformer dielectric loss and transformer parameter comprehensive tester

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103675462A (en) * 2013-12-17 2014-03-26 厦门红相电力设备股份有限公司 Small-current lightning impulse grounding impedance testing method and device
CN105021905A (en) * 2014-04-15 2015-11-04 国家电网公司 Transformer direct current resistance and transformer group tester
CN104090168A (en) * 2014-07-24 2014-10-08 国网浙江宁波市鄞州区供电公司 Transformer direct-current resistance and no-load voltage ratio testing device
CN104698319A (en) * 2015-03-20 2015-06-10 国家电网公司 Comprehensive tester for transformer parameters
CN105470919A (en) * 2015-12-10 2016-04-06 成都德善能科技有限公司 Safety switch-on system for 10kV step-down transformer
CN105470941A (en) * 2015-12-10 2016-04-06 成都德善能科技有限公司 Safety switch-on apparatus for 10kv step-down transformer
CN105467878A (en) * 2015-12-10 2016-04-06 成都德善能科技有限公司 A 10kv voltage transformer for safe closing
CN105467878B (en) * 2015-12-10 2018-06-08 南通盛洋电气有限公司 A kind of 10kV transformers of safety closing
CN105470941B (en) * 2015-12-10 2018-11-27 浙江国正安全技术有限公司 A kind of safety closing device for 10kv step-down transformer
CN105470919B (en) * 2015-12-10 2018-11-27 浙江国正安全技术有限公司 A kind of safety closing system for 10kV step-down transformer
CN105911363A (en) * 2016-05-10 2016-08-31 国网江苏省电力公司电力科学研究院 Transformer dielectric loss and transformer parameter comprehensive tester

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Granted publication date: 20130918

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