CN204330916U - A kind of transformer capacity proving installation - Google Patents
A kind of transformer capacity proving installation Download PDFInfo
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- CN204330916U CN204330916U CN201420789901.9U CN201420789901U CN204330916U CN 204330916 U CN204330916 U CN 204330916U CN 201420789901 U CN201420789901 U CN 201420789901U CN 204330916 U CN204330916 U CN 204330916U
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Abstract
The utility model relates to a kind of transformer capacity proving installation, belongs to transformer technology field.This transformer capacity proving installation, comprising the supply module, electricity ginseng input processing module and the human-computer interaction module that are electrically connected to each other, is optical coupling isolation device between electricity ginseng input processing module and human-computer interaction module.The compact structure of this product is light, and measuring accuracy is high, and cost is lower.
Description
Technical field
The utility model relates to a kind of transformer capacity proving installation, belongs to transformer technology field.
Background technology
In recent years, the development of advancing by leaps and bounds along with social economy, power consumption is also along with quick growth.Because two-part rate system price is carried out in China's electric system, except the expense involved by measuring apparatus, also basic charge as per installed capacity to be collected according to transformer capacity.So transformer capacity is a very important parameter.But some transformer is because using for many years, nameplate breakage is even lost, and causes determining its capacity.In addition, some lawless person, in order to try to gain illegal profit, goes to change nameplate, pretends to be small capacity transformer with Large Copacity.Cause serious economic loss to country and power grid enterprises.Meanwhile, whether transformer also needs to test its actual capacity and meets the requirements when dispatching from the factory commissioning test.As can be seen here, the device designing a Measurement accuracy transformer capacity is very necessary.
Chinese patent " 10 KV distribution transformer capacity testers [patent No. 200810012162.1] " proposes to adopt to any two-phase pressurization of winding, transformer capacity is measured by single-phase test method(s), although the equipment of complexity is simplified, can only test 10kV substation transformer, limitation is very large.
Chinese patent " Measuring Device for Distribution Transformer Capacity [patent No. 200720064025.3] " proposes to adopt simple three phase inverter to export, and affects measurement accuracy.
Chinese patent " active transformer capacity tester [patent No. 201120433544.9] " proposes the three-phase alternating-current supply adopting digit synthesis, and sampling section is remained and calculated by Single-chip Controlling A/D chip collection signal again, calculates greatly and complex structure.
This type of proving installation in the market needs external power supply and testing power supply mostly, brings inconvenience to on-the-spot test; Partial devices internal electric source is simple inversion AC power, affects its test accuracy.In addition, most of device adopts Single-chip Controlling A/D chip to sample to three-phase ac signal simultaneously and synchronously calculates, and complex structure, calculated amount are large and precision is difficult to guarantee.
Utility model content
The purpose of this utility model overcomes the problems referred to above existing in prior art, through a large amount of tests and exploration, according to structural principle and the national standard of existing transformer, the fundamental relation between short-circuit impedance, rated capacity and rated current is utilized to calculate actual capacity.Device built-in lithium battery, the three-phase alternating-current supply that digit synthesis is stable, solves the problem can only carrying out in prior art testing in hyperbaric chamber, can quick, effective, high-precision transformer capacity proving installation.
The utility model solves the problems of the technologies described above adopted technical scheme: this transformer capacity proving installation, comprise the supply module, electricity ginseng input processing module and the human-computer interaction module that are electrically connected to each other, be optical coupling isolation device between electricity ginseng input processing module and human-computer interaction module, it is characterized in that
Described electricity ginseng input processing module comprises current detection circuit, voltage detecting circuit, three-phase electrical energy computation chip, digit synthesis three-phase alternating-current supply and reference source, and described current detection circuit, voltage detecting circuit, digit synthesis three-phase alternating-current supply and reference source are electrically connected with three-phase electrical energy computation chip respectively.
as preferably, described human-computer interaction module comprises interactive processor, LCD MODULE, input through keyboard module, printout module, E2PROM storer and RTC real-time clock, and described LCD MODULE, input through keyboard module, printout module, E2PROM storer and RTC real-time clock are electrically connected with interactive processor respectively.
as preferably, described current detection circuit comprises the current transformer and low-pass filter circuit that are electrically connected to each other.
as preferably, described supply module comprises battery module and DC-DC isolation module, and described human-computer interaction module is that battery module is powered by DC-DC isolation module.
as preferably, described battery module is lithium battery power supply module, comprises the battery charger, battery flowmeter charge circle, negative supply change-over circuit and the lithium battery that are electrically connected to each other.
as preferably, described three-phase electrical energy computation chip is ADE7880 chip, ADE7880 built-in chip type 7 ADC, digital integrator and reference voltage source circuits.
as preferably, described interactive processor is the STC90C514 single-chip microcomputer of band 56K Flash.
as preferably, described LCD MODULE is 240*128 lattice lcd.
as preferably, described printout module is low-power consumption thermal printer, and interactive processor realizes data interaction by serial communication.
as preferably, described E2PROM storer is the AT24C64 of 64K capacity, and RTC real-time clock is PCF8563 chip, and both is all received on interactive processor by I2C bus.
The beneficial effects of the utility model are:
1, this device built-in lithium battery, compact structure is light.Without the need to any external power source during work, be easy to carry and outdoor site test, solve the problem that a lot of research technique can only carry out in hyperbaric chamber, reduce testing cost;
2, this device digit synthesis three-phase alternating-current supply, in circuit, band signal feedback, makes output more stable, provides guarantee for improving measuring accuracy;
3, adopt three-phase method of testing, wiring be simple, easy for operation, test quick and precisely;
4, the present invention adopts high precision three-phase electrical energy computation chip in signal sampling Treatment Design, can the information such as voltage effective value, current effective value, active power, power factor of Real-time Obtaining three-phase supply, do not need to be obtained by numerous and diverse calculating, decrease the computation burden of processor, improve real-time and the reliability of system, and reducing cost, measuring accuracy is high, and error is less than 0.1%.
Accompanying drawing explanation
Fig. 1 is the structural representation of the utility model embodiment.
Fig. 2 is the present embodiment software control schematic flow sheet.
Label declaration: supply module 1, battery module 11, DC-DC isolation module 12, electricity ginseng input processing module 2, current detection circuit 21, voltage detecting circuit 22, three-phase electrical energy computation chip 23, digit synthesis three-phase alternating-current supply 24, reference source 25, human-computer interaction module 3, interactive processor 31, LCD MODULE 32, input through keyboard module 33, printout module 34, E2PROM storer 35, RTC real-time clock 36, optical coupling isolation device 4.
Embodiment
Below in conjunction with drawings and Examples, the utility model is described in further detail.
Embodiment one: see Fig. 1, in the present embodiment, this device comprises the supply module 1, electricity ginseng input processing module 2 and the human-computer interaction module 3 that are electrically connected to each other, be optical coupling isolation device 4 between electricity ginseng input processing module 2 and human-computer interaction module 3, to reach the object of device stability and security.
Electricity ginseng input processing module 2 in the present embodiment comprises current detection circuit 21, voltage detecting circuit 22, three-phase electrical energy computation chip 23, digit synthesis three-phase alternating-current supply 24 and reference source 25, described current detection circuit 21, voltage detecting circuit 22, digit synthesis three-phase alternating-current supply 24 and reference source 25 are electrically connected with three-phase electrical energy computation chip 23 respectively, in addition, this module also comprises the supply module 1 providing electric energy, and supply module 1 comprises battery module 11 and DC-DC isolation module 12.
The present embodiment is in volume test device, current detection circuit 21 comprises current transformer and low-pass filter circuit, voltage signal detects by being input to low-pass filter circuit after electric resistance partial pressure, and the three-phase voltage processed after filtering, current signal are finally input to electric energy computation chip and process.Three-phase electrical energy computation chip 23 is ADE7880, ADE7880 built-in 7 ADC, digital integrator, reference voltage source circuits, enormously simplify the design of peripheral circuit, adds reliability, and reduce cost; This chip from motion tracking fundamental frequency, respectively can all have system calibration function (effective value mistuning calibration function, phase alignment and gain calibration) mutually.Therefore, can realize high-precision measurement requirement, the measuring error of voltage, current effective value is all less than 0.1%.
Three-phase synthesis power supply described in device, export by Single-chip Controlling D/A chip the sine wave signal that three road differential seat angles are 120 degree, sine wave signal through power amplification, then by the amplitude that amplifier feedback stability exports, finally outputs on the three-phase windings of tested transformer.
Lithium battery power supply module 1 described in device, comprises battery charger, battery flowmeter charge circle, negative supply change-over circuit.Monitoring cell electricity quantity converts frequency signal by KA331 chip to voltage signal and is input to single-chip microcomputer again to realize.
Human-computer interaction module 3 in the present embodiment, mainly comprise interactive processor 31, LCD MODULE 32, input through keyboard module 33, printout module 34, E2PROM storer 35 and RTC real-time clock 36, the power supply of this part is that battery is realized by DC-DC isolation module 12.
The present embodiment is in the human-computer interaction module 3 of volume test device, interactive processor 31 is STC90C514 single-chip microcomputers of band 56K Flash, LCD MODULE 32 is 240*128 lattice lcds, and display module and Keysheet module are the parallel ports of directly being received single-chip microcomputer by latch, convenient expansion; Printer is low-power consumption thermal printer, and single-chip microcomputer realizes data interaction by serial communication; Outside E2PROM storer 35 is AT24C64 of 64K capacity, and real-time clock is PCF8563 chip, and both is all received on single-chip microcomputer by I2C bus.
Embodiment two:
As shown in Figure 2, single-chip microcomputer is by SPI Interface Controller ADE7880 for the control flow of the present embodiment.System electrification, single-chip microcomputer starts kernel initialization and the initialization of ADE7880 chip configuration, then three-phase gain calibration data, the phase alignment data of reading and saving in E2PROM, is then loaded in system variable.Program starts the three phase electrical parameters of the tested transformer of Real-time Collection, comprise three-phase current effective value, voltage effective value, phase differential, active power etc., then in certain time interval (being generally 0.5 second), be averaged computing to these data, final data substitute into calculation of capacity formula and obtain actual capacity value.Finally, result is shown on liquid crystal, needs printing test result according to test.
According to the technical requirement of national standard " three-phase oil-immersed power transformer technical parameter and requirement " and " dry-type power transformer technical parameter and requirement ", utilize the fundamental relation between short-circuit impedance, rated capacity and rated current to calculate actual capacity, concrete formula is as follows:
Wherein,
u n for rated primary voltage,
u k for transformer impedance drop,
u i for primary side measuring voltage,
u i for primary side measures electric current.
Above content described in this instructions is only to the explanation of the utility model structure example.The utility model person of ordinary skill in the field can make various amendment or supplements or adopt similar mode to substitute to described specific embodiment; only otherwise depart from structure of the present utility model or surmount this scope as defined in the claims, protection domain of the present utility model all should be belonged to.
Claims (10)
1. a transformer capacity proving installation, comprises the supply module, electricity ginseng input processing module and the human-computer interaction module that are electrically connected to each other, is optical coupling isolation device, it is characterized in that between electricity ginseng input processing module and human-computer interaction module,
Described electricity ginseng input processing module comprises current detection circuit, voltage detecting circuit, three-phase electrical energy computation chip, digit synthesis three-phase alternating-current supply and reference source, and described current detection circuit, voltage detecting circuit, digit synthesis three-phase alternating-current supply and reference source are electrically connected with three-phase electrical energy computation chip respectively.
2. transformer capacity proving installation according to claim 1, it is characterized in that: described human-computer interaction module comprises interactive processor, LCD MODULE, input through keyboard module, printout module, E2PROM storer and RTC real-time clock, described LCD MODULE, input through keyboard module, printout module, E2PROM storer and RTC real-time clock are electrically connected with interactive processor respectively.
3. transformer capacity proving installation according to claim 1, is characterized in that: described current detection circuit comprises the current transformer and low-pass filter circuit that are electrically connected to each other.
4. transformer capacity proving installation according to claim 1, is characterized in that: described supply module comprises battery module and DC-DC isolation module, described human-computer interaction module is that battery module is powered by DC-DC isolation module.
5. transformer capacity proving installation according to claim 4, is characterized in that: described battery module is lithium battery power supply module, comprises the battery charger, battery flowmeter charge circle, negative supply change-over circuit and the lithium battery that are electrically connected to each other.
6. transformer capacity proving installation according to claim 1, is characterized in that: described three-phase electrical energy computation chip is ADE7880 chip, ADE7880 built-in chip type 7 ADC, digital integrator and reference voltage source circuits.
7. transformer capacity proving installation according to claim 2, is characterized in that: described interactive processor is the STC90C514 single-chip microcomputer of band 56K Flash.
8. transformer capacity proving installation according to claim 2, is characterized in that: described LCD MODULE is 240*128 lattice lcd.
9. transformer capacity proving installation according to claim 2, is characterized in that: described printout module is low-power consumption thermal printer, and interactive processor realizes data interaction by serial communication.
10. transformer capacity proving installation according to claim 2, is characterized in that: described E2PROM storer is the AT24C64 of 64K capacity, and RTC real-time clock is PCF8563 chip, and both is all received on interactive processor by I2C bus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420789901.9U CN204330916U (en) | 2014-12-15 | 2014-12-15 | A kind of transformer capacity proving installation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420789901.9U CN204330916U (en) | 2014-12-15 | 2014-12-15 | A kind of transformer capacity proving installation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204330916U true CN204330916U (en) | 2015-05-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420789901.9U Active CN204330916U (en) | 2014-12-15 | 2014-12-15 | A kind of transformer capacity proving installation |
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| Country | Link |
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| CN (1) | CN204330916U (en) |
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