CN109407036B - Full-automatic calibrating device of batch current transformer based on PLC control - Google Patents
Full-automatic calibrating device of batch current transformer based on PLC control Download PDFInfo
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- CN109407036B CN109407036B CN201811638629.3A CN201811638629A CN109407036B CN 109407036 B CN109407036 B CN 109407036B CN 201811638629 A CN201811638629 A CN 201811638629A CN 109407036 B CN109407036 B CN 109407036B
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- 238000012795 verification Methods 0.000 claims abstract description 26
- 238000001514 detection method Methods 0.000 claims abstract description 21
- 238000012360 testing method Methods 0.000 claims abstract description 14
- 230000033228 biological regulation Effects 0.000 claims abstract description 12
- 230000001360 synchronised effect Effects 0.000 claims abstract description 6
- 230000001105 regulatory effect Effects 0.000 claims description 17
- 230000009466 transformation Effects 0.000 claims description 10
- 230000007175 bidirectional communication Effects 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 230000005674 electromagnetic induction Effects 0.000 claims description 4
- 238000009434 installation Methods 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 238000012958 reprocessing Methods 0.000 claims description 3
- 230000000630 rising effect Effects 0.000 claims description 2
- 238000005070 sampling Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 8
- 238000012423 maintenance Methods 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 7
- 230000001276 controlling effect Effects 0.000 description 5
- 238000005259 measurement Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005347 demagnetization Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/05—Programmable logic controllers, e.g. simulating logic interconnections of signals according to ladder diagrams or function charts
Abstract
The invention discloses a full-automatic transformer calibrating device based on PLC control, which has the advantages that after PLC is added to control, compared with a singlechip control circuit, the full-automatic transformer calibrating device is stable and reliable, has strong anti-interference capability, greatly reduces the fault maintenance rate and has high degree of automation; in addition, a method for opening and testing the primary series up-flow secondary terminal parallel synchronous detection stations of the tested current transformer is adopted, even if the current transformers are connected in parallel in batches, the impedance of an external lead of a secondary loop of the current transformer can be accurately controlled to meet the regulation requirement of 0.05 omega or 0.06 omega, the accuracy of verification errors is ensured, the current transformer is prevented from being damaged by secondary open circuit by adopting a technical method of switching stations in a mode of delaying 5-10 milliseconds after the first connection and the last disconnection through PLC programming control, so that the full-automatic verification of larger batches of through-core current transformers can be realized, the pipeline detection can be realized by adding electromechanical control equipment by the method, and the detection working efficiency is greatly improved; the device is used for calibrating the non-through type current transformer and the voltage transformer automatically.
Description
Technical Field
The invention relates to the technical field of transformer detection, in particular to a full-automatic verification device for batch punching type current transformers based on PLC industrial control.
Background
The transformer calibrating device is a special precision instrument for calibrating and testing the errors of the transformers before the transformer calibrating device is assembled in order to ensure the accuracy of the transformers in the electric energy metering device of the electric power system. At present, various forms of transformer calibrating devices are commonly used in power systems. The advanced full-automatic transformer verification device is provided with measurement points which can automatically carry out full-load and light-load measurement according to the current or voltage requirements of different transformation ratios according to the transformer verification rules. And the transformer verification management software automatically carries out error data rectification on the test data according to the accuracy grade of the tested transformer and judges whether the error is out of tolerance. The load gear of the transformer load box is automatically switched without manual switching. The device can also automatically complete the closed-circuit demagnetization test of the transformer and has various protection functions. However, due to the fact that the single-chip microcomputer control is adopted, stability and reliability are poor, maintenance rate is high, programming modification and maintenance are not convenient for users according to needs, and due to the fact that the current transformers are all series-connected in batches, the contact resistance of the accumulated relay exceeds the requirement of secondary impedance specified by regulations, the primary installation batch of the current transformers is limited to be not more than 12 current transformers, otherwise, the error of the detection transformer is seriously affected by the fact that secondary load is out of tolerance, and therefore electric energy metering is inaccurate. Along with the increase of the demand of the power grid upgrading transformation on the transformer, the verification quantity of the transformer is synchronously increased, the detection working efficiency of the transformer is improved, the operation and maintenance cost is reduced, and the advantages of the device for realizing the full-automatic verification of large-batch through type current transformers by accurately controlling the secondary impedance based on the parallel connection of the secondary terminals of the PLC industrial control are reflected.
Disclosure of Invention
The invention aims to provide a device which is based on PLC control and is used for accurately controlling secondary impedance by connecting secondary terminals in parallel, can realize full-automatic verification of large-batch through type current transformers, and can also verify non-through type current transformers and voltage transformers so as to solve the problems in the background technology.
In order to achieve the above purpose, the present invention provides the following technical solutions: the device is provided with an upper computer, one end of the upper computer is connected with a transformer calibrator, the other end of the upper computer is connected with a programmable controller, the programmable controller is only connected with the transformer calibrator, the device is further provided with a current transformer load box, a voltage regulation output assembly, an alternating current contactor and the like, and one side of the alternating current contactor is provided with a digital current/voltage meter, a standard current transformer secondary tap group, a self-elevating standard current transformer, a self-elevating standard voltage transformer and an auxiliary test bench N station group; the current transformer load box and the voltage transformer load box can also be combined current and voltage transformer load boxes; the voltage regulating output assembly is formed by connecting a coarse electric voltage regulator assembly and a fine electric voltage regulator assembly through an intermediate transformer coil, and can be replaced by a program control electronic source; the standard current transformer secondary tap group and the self-lifting standard current transformer can be also self-lifting intelligent standard current transformers with transformation ratio secondary tap switching relays, and can be used separately from the standard current transformer and the standard current transformer secondary tap group; the self-boosting standard current transformer can be used by a booster and a standard voltage transformer separately; the program control instrument comprises a PLC programmable controller, a programmable control touch screen, an acquisition circuit and the like; one end of the auxiliary test stand N working bit group is connected with one end of the transformer calibrator.
Preferably, the auxiliary test stand N station group is provided with N (N is less than or equal to 1) station automatic switching, automatic switching of N stations on the auxiliary test stand, automatic switching of a self-elevating standard current transformer multi-transformation secondary tap, automatic switching of a load gear of a current transformer load box and a voltage transformer load box, automatic lifting of a voltage regulation output assembly voltage and actuation of an alternating current contactor, the program control instrument is connected with a transformer calibrator in a signal acquisition mode, a digital ammeter is connected in series with a secondary current loop of the transformer calibrator, a digital ammeter is connected with a secondary voltage loop of the transformer calibrator, and the program control instrument controls the automatic or manual operation state of the transformer calibrator.
Preferably, the N through type current transformers on the auxiliary table of the program control instrument control device are all one-turn through at one time, and the secondary terminals are connected in parallel and connected into the working site group according to the polarity indication.
Compared with the prior art, the invention has the beneficial effects that:
after the PLC is added for control, compared with a singlechip control circuit, the PLC has the advantages of stability, reliability, strong anti-interference capability, greatly reduced fault maintenance rate and high degree of automation; in addition, a method for opening and testing the primary series up-flow secondary terminal parallel synchronous detection stations of the tested current transformer is adopted, even if the current transformers are connected in parallel in batches, the resistances of secondary circuits of the current transformers are accurately controlled to meet the regulation requirements of 0.05 omega or 0.06 omega, the accuracy of verification errors is ensured, and no secondary open circuit is guaranteed by a technical method of switching stations in a mode of delaying 5-10 milliseconds after the first connection and the last disconnection through PLC programming control, so that the full-automatic verification of larger batches of through-type current transformers can be realized, the pipeline detection can be realized by adding electromechanical control equipment by the method, and the detection working efficiency is greatly improved; the device is used for calibrating the non-through type current transformer and the voltage transformer automatically.
Drawings
FIG. 1 is a schematic diagram of a device configuration block diagram for realizing full-automatic verification of batch-type through-core current transformers by accurately controlling secondary impedance based on PLC control and parallel connection of secondary terminals;
FIG. 2 is a schematic perspective view of an auxiliary table according to the present invention;
FIG. 3 is a schematic diagram of the current transformer detection and control principle of the present invention;
FIG. 4 is a schematic diagram of the detection and control principle of the voltage transformer of the present invention;
FIG. 5 is a schematic diagram of a second configuration block of the device for accurately controlling the secondary impedance based on the PLC control and the parallel connection of the secondary terminals to realize the full-automatic verification of the batch-type through-core current transformer;
FIG. 6 is a schematic diagram of the second configuration current transformer detection and control principle of the present invention;
FIG. 7 is a schematic diagram of the detection and control principle of the second configuration voltage transformer of the present invention;
in the figure: 1. the device can realize full-automatic verification of batch current transformers by accurately controlling the secondary impedance based on the parallel connection of the secondary terminals controlled by the PLC; 2. an upper computer; 3. a transformer calibrator; 4. a program control instrument; 5. a current transformer load box; 6. a digital current/voltage meter; 7. an alternating current contactor; 8. a voltage regulating output assembly; 9. a self-elevating standard current transformer; 10. the auxiliary station N working bits group; 11. a tested current transformer; 12. a tested voltage transformer; 13. a self-boosting standard voltage transformer; 14. a voltage transformer load box; 15. and a secondary tap group of the standard current transformer.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1: referring to fig. 1, 2, 3 and 4, the present invention provides a technical solution: the device 1 is composed of a computer table, a main control table and an auxiliary table in the overall structure, wherein an upper computer 2 comprising transformer verification management system software is arranged on the computer table and is respectively in bidirectional communication with a transformer calibrator 3 in the main control table and a PLC in a program control instrument 4 through RS232 interfaces; the main control desk is provided with a transformer calibrator 3, a program control instrument 4, a current transformer load box 5, a digital current/voltage meter 6, an alternating current contactor 7 and a voltage regulation output assembly 8; auxiliary station see fig. 2 for configuring self-current-rising standard current transformer 9, auxiliary station N working group 10, self-voltage-rising standard voltage transformer 13 (safety high-voltage safety distance)The auxiliary platform is required to be independently arranged beside the auxiliary platform), a voltage transformer load box 14 and a standard current transformer secondary tap group 15; the digital current/voltage meter 6 is communicated with a PLC in the program control instrument 4 through an RS485 interface to provide current/voltage digital signals, the PLC in the program control instrument (4) is also respectively connected with a control transformer calibrator 3, a current transformer load box 5, an alternating current contactor 7, a voltage regulating output assembly 8, a self-elevating standard current transformer 9, an auxiliary station N working bit group 10, a voltage transformer load box 14 and a standard current transformer secondary tap group 15, and the T of the transformer calibrator 3 is that 0 The secondary tap group 15 of the standard current transformer is connected with the secondary nonpolar end K of the self-elevating standard current transformer 9 through the ammeter connected with the digital current/voltage meter 6 in series X T of connection and mutual inductor calibrator 3 X The secondary nonpolar end S2 of the N tested current transformers 11 and the K of the transformer calibrator 3 are connected in parallel by being connected with the current transformer load box 5 in series and then being connected with N normally open contacts corresponding to the nonpolar end station relays of the N tested current transformers 11 of the auxiliary station N station group 10 i The secondary polarity end S1 of N tested current transformers 11 are connected in parallel with the secondary polarity end K1 of the self-elevating standard current transformer 9, the grounding terminal of the D connecting instrument of the transformer calibrator 3 is grounded again, the voltage regulating output assembly 8 is connected with a contact selection switch of the alternating current contactor 7 to be connected into a primary loop of the current booster in the self-elevating standard current transformer 9, and the current booster in the self-elevating standard current transformer 9 simultaneously connects the standard current transformers in the self-elevating standard current transformer 9 and the N tested current transformers 11 in series into a closed loop in a primary polarity end-to-end manner, so that a detection and control circuit of the current transformer is formed; in addition, the a and x terminals of the transformer calibrator 3 are correspondingly connected with the self-boosting standard voltage transformer 13 through a voltmeter of the parallel digital current/voltmeter 6, and the polarity end a of the self-boosting standard voltage transformer 13 is connected with the polarity end a of the tested voltage transformer 12 and the K of the transformer calibrator 3 U The secondary nonpolar end x of the tested voltage transformer 12 is connected, the D of the transformer calibrator 3 is connected with the secondary nonpolar end x of the tested voltage transformer 12, the instrument grounding terminal is connected with the instrument grounding terminal at the same time, the voltage regulating output assembly 8 is connected with the contact selection switch of the alternating current contactor 7 to be connected with the self-boosting standard voltageThe primary loop of the booster in the transformer 13, the booster in the self-boosting standard voltage transformer 13 connects the standard voltage transformer in the self-boosting standard voltage transformer 13 and the tested voltage transformer 12 in parallel in a mode of connecting the primary polar end with the non-polar end and grounding the non-polar end to form a closed loop, so that a detection and control circuit of the voltage transformer is formed.
The current transformer detection process comprises the following steps: the program control instrument 4 comprises a PLC programmable controller and a touch screen and an acquisition circuit which are controlled by the PLC programmable controller in a programming way, the program control instrument 4 receives an operation instruction of the upper computer 2 and simultaneously returns data information of the upper computer 2, the ammeter of the digital ammeter/voltmeter 6 and the transformer calibrator 3 synchronously receive signals of rated secondary currents of the standard transformer from the self-elevating standard current transformer 9, convert the signals into digital signals and communicate with the PLC in the program control instrument 4 through an RS485 interface, the PLC in the program control instrument 4 respectively controls the manual or automatic state of the transformer calibrator 3, the load switching of the current transformer load box 5, the contact on-off of the alternating current contactor 7, the regulation of the output voltage of the voltage regulating output assembly 8 through the programmed instruction, so that the primary current of the N tested current transformers 11 connected in series with the current rising of the self-rising standard current transformer 9 rises and falls and synchronously electromagnetically induces the transformation ratio conversion of the secondary tap group 15 of the standard current transformer to the secondary side of all the current transformers, so that the transformation ratio of the standard current transformer of the self-rising standard current transformer 9 is consistent with that of the N tested current transformers 11, the station first-after-break delay of the auxiliary station N station group 10 connected with the N tested current transformers 11 is gradually switched through the sequential position of the sequential current transformers to facilitate error testing sampling points, the current and the sequential position of the current transformer which are inducted by the primary side electromagnetic induction of each test point are synchronously transmitted to the transformer calibrator 3 for operation treatment, the analog signal A/D received by the transformer calibrator 3 is synchronously transmitted to the microprocessor through the synchronous operation processor after the conversion of the analog signal A/D to the microprocessor, thereby realizing the purpose of batch verification of the through type current transformer.
Example 2: referring to fig. 5, 2, 6 and 7, another technical solution is provided in the present invention: based on PLC controlThe full-automatic verification device for the batch current transformers is characterized in that the device 1 is composed of a computer table, a main control table and an auxiliary table in the overall structure, an upper computer 2 comprising transformer verification management system software is installed on the computer table, and the upper computer 2 and a PLC (programmable logic controller) in a main control table mileage controller 4 are in bidirectional communication through an RS232 interface; the main control desk is provided with a transformer calibrator 3, a program control instrument 4, a current transformer load box 5, a voltage transformer load box 14, an alternating current contactor 7 and a voltage regulation output assembly 8; the auxiliary platform is shown in fig. 2, and is provided with a self-current-rising standard current transformer 9, an auxiliary platform N working group 10, a self-current-rising standard voltage transformer 13 (the safety distance requirement of safety regulations is generally independently arranged beside the auxiliary platform), and a standard current transformer secondary tap group 15; the PLC in the program control instrument 4 is in bidirectional communication with the transformer calibrator 3 through an RS232 interface, and is also respectively connected with a control current transformer load box 5, an alternating current contactor 7, a voltage regulating output assembly 8, a self-lifting standard current transformer 9, an auxiliary station N working site group 10, a voltage transformer load box 14 and a standard current transformer secondary tap group 15, wherein the T of the transformer calibrator 3 is as follows 0 The secondary tap group 15 of the standard current transformer is connected with the secondary nonpolar end K of the self-lifting standard current transformer 9 X T of connection and mutual inductor calibrator 3 X The device is connected with the current transformer load box 5 in series and then is connected with N normally open contacts corresponding to N non-polar end station relays of N tested current transformers 11 of an auxiliary station N station group 10 in parallel so as to butt joint a secondary non-polar end S2 of the N tested current transformers 11 and K of a transformer calibrator 3 i The secondary polarity end S1 of N tested current transformers 11 are connected in parallel with the secondary polarity end K1 of the self-elevating standard current transformer 9, the grounding terminal of the D connecting instrument of the transformer calibrator 3 is grounded again, the voltage regulating output assembly 8 is connected with a contact selection switch of the alternating current contactor 7 to be connected into a primary loop of the current booster in the self-elevating standard current transformer 9, and the current booster in the self-elevating standard current transformer 9 simultaneously connects the standard current transformers in the self-elevating standard current transformer 9 and the N tested current transformers 11 in series into a closed loop in a primary polarity end-to-end manner, so that a detection and control circuit of the current transformer is formed; in addition, the a and x terminals of the transformer calibrator 3 are correspondingly connected with the self-boosting standard voltage transformer 13, and the self-boosting standard voltage transformer is a self-boosting standard voltage transformerThe polarity end a of the voltage transformer 13 is connected with the polarity end a of the tested voltage transformer 12 and the K of the transformer calibrator 3 U The secondary nonpolar end x of the tested voltage transformer 12 is connected, the D of the transformer calibrator 3 is connected with the secondary nonpolar end x of the tested voltage transformer 12, the instrument grounding terminal is connected with the ground terminal, the voltage regulating output assembly 8 is connected with a contact selection switch of the alternating current contactor 7 and is connected with a booster primary loop in the self-boosting standard voltage transformer 13, and meanwhile, the booster in the self-boosting standard voltage transformer 13 connects the standard voltage transformer in the self-boosting standard voltage transformer 13 and the tested voltage transformer 12 in parallel in a mode of connecting the primary nonpolar end with each other and connecting the nonpolar end with the ground terminal to form a closed loop, so that a detection and control circuit of the voltage transformer is formed.
The current transformer detection process comprises the following steps: the programmable controller 4 comprises a touch screen and an acquisition circuit which are controlled by the programmable controller and the programmable controller, the programmable controller 4 receives the operation instruction of the upper computer 2 and simultaneously returns the data information of the upper computer 2, the programmable controller 4 and the transformer calibrator 3 are controlled by the RS232 bi-directional communication and receive the error operation data of the transformer calibrator 3, the PLC in the programmable controller 4 receives the signal of the transformer calibrator 3 in real time and respectively controls the manual or automatic state of the transformer calibrator 3, the load switching of the current transformer load box 5, the contact on-off of the alternating current contactor 7 and the regulation of the output voltage of the voltage regulating output assembly 8, so that the primary current of the up-converter standard current transformer 9 is connected with the primary current of the N tested current transformers 11 in series, the secondary side of the standard current transformer is synchronously and electromagnetically sensed, the transformation ratio of the secondary tap group 15 of the standard current transformer is converted, the standard current transformer of the up-converter standard current transformer 9 is consistent with the transformation ratio of the N tested current transformers 11, the auxiliary station N groups 10 are connected with the N tested current transformers 11 in parallel, and the time delay stations of the N tested current transformers 11 are switched one by one, the current and differential current which are obtained by electromagnetic induction of the primary side at the secondary side of the standard current transformer and the tested current transformer at each rule test point are transmitted to the transformer calibrator 3 in a point-by-point synchronous and downstream mode, the transformer calibrator 3 synchronously transmits the data which is obtained by carrying out A/D conversion on the received analog signals and arithmetic processing on the analog signals by a microprocessor to the upper computer 2 for judgment and reprocessing through the program control instrument 4, and therefore the purpose of batch verification of the through current transformers is achieved.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (4)
1. Full-automatic calibrating installation of batch current transformer based on PLC control, its characterized in that: the device (1) is composed of a computer table, a main control table and an auxiliary table in the overall structure, wherein an upper computer (2) comprising transformer verification management system software is arranged on the computer table and is respectively in bidirectional communication with a transformer calibrator (3) in the main control table and a PLC (programmable logic controller) in a program control instrument (4) through an RS232 interface; the main control desk is provided with a transformer calibrator (3), a program control instrument (4), a current transformer load box (5), a digital current/voltage meter (6), an alternating current contactor (7) and a voltage regulation output assembly (8); the auxiliary platform is provided with a self-lifting standard current transformer (9), an auxiliary platform N-working group (10), a self-lifting standard voltage transformer (13), a voltage transformer load box (14) and a standard current transformer secondary tap group (15); the digital current/voltage meter (6) is communicated with a PLC in the program control instrument (4) through an RS485 interface, the PLC in the program control instrument (4) is also respectively connected with and controls a transformer calibrator (3), a current transformer load box (5), an alternating current contactor (7), a voltage regulating output assembly (8), a self-elevating standard current transformer (9), an auxiliary station N working bit group (10), a voltage transformer load box (14), a standard current transformer secondary tap group (15) and a T of the transformer calibrator (3) 0 The secondary tap group (15) of the standard current transformer is connected with the secondary nonpolar end K of the self-elevating standard current transformer (9) through an ammeter connected with the digital current/voltage meter (6) in series X T of connecting and mutual inductor calibrator (3) X The secondary nonpolar end S2 of the N tested current transformers (11) are connected in parallel with N normally open contacts corresponding to N nonpolar end station relays of the N tested current transformers (11) of the auxiliary station N station group (10) through being connected in series with the current transformer load box (5) and then being connected with the transformer calibrator(3) K of (2) i The secondary polarity end S1 of N tested current transformers (11) are connected in parallel with the secondary polarity end K1 of the self-elevating standard current transformer (9), the grounding terminal of a D connecting instrument of the transformer calibrator (3) is grounded, the voltage regulating output assembly (8) is connected with a contact selection switch of an alternating current contactor (7) to be connected into a primary loop of the current riser in the self-elevating standard current transformer (9), the current riser in the self-elevating standard current transformer (9) simultaneously connects the standard current transformers in the self-elevating standard current transformer (9) and the N tested current transformers (11) in series into a closed loop in a primary polarity end-to-top mode, so that a detection and control circuit of the current transformers is formed, the station first-to-break delay of the N tested current transformers (11) is connected in parallel with the auxiliary station N station group (10) and is switched in one station first-to-station first-to-break delay, and the station first-to-break switching is controlled by a PLC (4) to control delay for 5-10 milliseconds, and the station first-to break switching is controlled by the PLC to ensure that the current transformer has no secondary open circuit.
2. The full-automatic verification device for batch current transformers based on PLC control according to claim 1, wherein the full-automatic verification device is characterized in that: the programmable controller (4) comprises a Programmable Logic Controller (PLC) and a touch screen and an acquisition circuit which are controlled by the PLC, the programmable controller (4) receives an operation instruction of the upper computer (2), the ammeter of the digital ammeter/voltmeter (6) and the transformer calibrator (3) synchronously receive rated secondary current signals of the standard transformer from the current-up standard transformer (9) and convert the rated secondary current signals into digital signals, and then communicate with the PLC in the programmable controller (4) through an RS485 interface, the PLC in the program control instrument (4) receives the signal in real time and controls the manual or automatic state of the transformer calibrator (3), the load switching of the current transformer load box (5), the contact on-off of the alternating current contactor (7) and the height adjustment of the output voltage of the voltage regulating output assembly (8) respectively through the programmed instruction, so that the primary current of the N tested current transformers (11) in series connection with the current rising of the self-rising standard current transformers (9) is lifted and synchronously and electromagnetically inducted to the secondary sides of all the current transformers, the transformation ratio of the standard current transformer secondary tap group (15) is converted, so that the transformation ratio of the standard current transformers of the self-rising standard current transformers (9) is consistent with that of the N tested current transformers (11), the station make-up time delay one-by-one through-core type current transformer sequential switching of N tested current transformers (11) in parallel connection with the auxiliary station N work bit group (10) is convenient for error test sampling points, the current and differential current of the standard and tested current transformers, which are obtained by electromagnetic induction of the primary side at the secondary side of each rule test point, are transmitted to the transformer calibrator (3) in a point-by-point synchronous and sequential mode for operation processing, and the transformer calibrator (3) synchronously transmits the data of the received analog signals, which are subjected to the operation processing of the microprocessor through A/D conversion, to the upper computer (2) for judgment and reprocessing, so that the aim of batch verification of the through current transformers is fulfilled.
3. Full-automatic calibrating installation of batch current transformer based on PLC control, its characterized in that: the device (1) is composed of a computer table, a main control table and an auxiliary table in the overall structure, wherein an upper computer (2) comprising transformer verification management system software is installed on the computer table, and the upper computer (2) and a PLC (programmable logic controller) in a main control table mileage controller (4) are in bidirectional communication through an RS232 interface; the main control desk is provided with a transformer calibrator (3), a program control instrument (4), a current transformer load box (5), an alternating current contactor (7) and a voltage regulation output assembly (8); the auxiliary platform is provided with a self-lifting standard current transformer (9), an auxiliary platform N-working group (10), a self-lifting standard voltage transformer (13), a voltage transformer load box (14) and a standard current transformer secondary tap group (15); the PLC in the program control instrument (4) is in bidirectional communication with the transformer calibrator (3) through an RS232 interface, and is also respectively connected with and controls a current transformer load box (5), an alternating current contactor (7), a voltage regulating output assembly (8), a self-lifting standard current transformer (9), an auxiliary station N working bit group (10), a voltage transformer load box (14) and a standard current transformer secondary tap group (15), and the T of the transformer calibrator (3) 0 The secondary tap group (15) of the standard current transformer is connected with the secondary nonpolar end K of the self-elevating standard current transformer (9) X T of connecting and mutual inductor calibrator (3) X The secondary nonpolar end S2 of the N tested current transformers (11) and the K of the transformer calibrator (3) are connected in parallel with N normally open contacts corresponding to N tested current transformer (11) nonpolar end station relays of the N working groups (10) of the auxiliary station in series with the current transformer load box (5) to be butted i The secondary polarity end K1 of the self-current-rising standard current transformer (9) is connected in parallel with NThe secondary polarity end S1 of each tested current transformer (11) and the grounding terminal of the D connecting instrument of the transformer calibrator (3) are grounded, the voltage regulating output assembly (8) is connected with a contact selection switch of the alternating current contactor (7) to be connected into a primary loop of a current booster in the self-boosting standard current transformer (9), the current booster in the self-boosting standard current transformer (9) simultaneously connects the standard current transformers in the self-boosting standard current transformer (9) and N tested current transformers (11) in series into a closed loop in a primary polarity end-to-end manner, thus a detection and control circuit of the current transformers is formed, and stations of the N station groups (10) of the auxiliary stations connected with the N tested current transformers (11) in parallel are connected in a first-break and last-delay sequential switching mode one by one.
4. The full-automatic verification device for batch current transformers based on PLC control according to claim 3, wherein: the programmable logic controller (4) comprises a Programmable Logic Controller (PLC) and a touch screen and an acquisition circuit which are controlled by programming the programmable logic controller, the programmable logic controller (4) receives an operation instruction of the upper computer (2) and simultaneously returns data information of the upper computer (2), the programmable logic controller (4) and the transformer calibrator (3) are controlled through RS232 bidirectional communication and receive error operation data of the transformer calibrator (3), the PLC in the programmable logic controller (4) receives signals of the transformer calibrator (3) in real time and respectively controls the manual or automatic state of the transformer calibrator (3) through programmed instructions, the load of a current transformer load box (5) is switched, the contacts of an alternating current contactor (7) are switched on and off, the voltage regulating output assembly (8) is regulated in output voltage, so that primary current of N tested current transformers (11) are connected in series with an up-converter of the up-converter standard current transformer (9) and synchronous electromagnetic induction is conducted to the secondary side of all the current transformers, the transformation ratio conversion of a secondary tap group (15) of the standard current transformer is conducted on the up-converter (9) and the secondary side of the current transformer is conducted to the secondary side of the current transformer through the up-converter, and the standard transformer is conducted on the secondary side of the current transformer (11) and the secondary current transformer in parallel to the up converter of the up converter standard current transformer (9) through the standard current transformer, the transformer calibrator (3) synchronously transmits the data which is processed by the microprocessor operation and is subjected to the A/D conversion to the upper computer (2) through the program control instrument (4) for judgment and reprocessing, thereby realizing the purpose of batch verification of the through type current transformer.
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| CN201811638629.3A CN109407036B (en) | 2018-12-29 | 2018-12-29 | Full-automatic calibrating device of batch current transformer based on PLC control |
| PCT/CN2019/082002 WO2020133796A1 (en) | 2018-12-29 | 2019-04-10 | Plc control-based full-automatic batch current transformer verification device |
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| CN201811638629.3A CN109407036B (en) | 2018-12-29 | 2018-12-29 | Full-automatic calibrating device of batch current transformer based on PLC control |
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| CN111693925B (en) * | 2020-07-20 | 2023-01-03 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Current transformer detection operation platform and multi-position top-speed current transformer calibration system |
| CN112068062B (en) * | 2020-09-10 | 2023-01-03 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Mutual inductor calibration system and calibration method |
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| CN112731258A (en) * | 2021-01-13 | 2021-04-30 | 国网新疆电力有限公司营销服务中心(资金集约中心、计量中心) | Auxiliary wiring device of current transformer |
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| CN113820644A (en) * | 2021-09-16 | 2021-12-21 | 国网四川省电力公司营销服务中心 | Distribution network mutual inductor measurement performance integrated on-site calibration device |
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| WO2020133796A1 (en) | 2020-07-02 |
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