Simulation current transformer wiring detection circuit, simulation training device and system

Abstract

The application provides a simulation current transformer wiring detection circuit, a detection simulation training device and a system. A group of measured parallel circuits composed of resistors Rn and diodes Dn are arranged between secondary wiring terminals of a measured simulation current transformer. A group of standard parallel circuits composed of resistors Rm and diodes Dm are arranged between secondary wiring terminals of a standard simulation current transformer. The measured parallel circuits are connected in series in a measured sampling voltage dividing circuit, and the standard parallel circuits are connected in series in a standard sampling voltage dividing circuit. The wiring state of the measured simulation current transformer and the standard simulation current transformer is judged by an MCU of a simulation current transformer calibrator according to a measured sampling voltage dividing value and a standard voltage dividing value.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of mimicry, in particular, a kind of simulation current transformer wiring detection circuit, calibrating simulation training device and system are provided. BACKGROUND

[0002] As an important measurement link of electric energy trade settlement, the accuracy of mutual inductor is paid close attention to by both buying and selling electricity, and the annual calibration workload is huge. Since mutual inductor is a high-voltage and high-current equipment, its calibration and training have great safety risks. The traditional centralized training, demonstration experiment, written examination and one-to-one training examination for measurement calibration personnel have great limitations, and the training effect is poor.

[0003] To meet the demand for skill training of mutual inductor measurement calibration personnel, some manufacturers have developed simulation training devices and systems according to real mutual inductor equipment. Most of them reduce the voltage and current in the calibration training process to ensure the safety of the operator during calibration and testing. For example, the simulation current transformer in document CN201410009671.4 has a real core and coil inside, and a real current with small amplitude is generated during training, so the operation risk still exists.

[0004] In order to simulate the wiring error and polarity error of mutual inductor calibration and testing, a fault simulation switching circuit is built in the simulation mutual inductor shell, which inevitably increases a power supply and communication line between each simulation test mutual inductor, standard voltage (current) mutual inductor and control host. Therefore, there is still a difference from the real scene of mutual inductor calibration, which gives the students a wrong understanding.

[0005] In order to solve the above problems, people have been seeking an ideal technical solution. SUMMARY

[0006] The present application aims at the deficiencies of the prior art, and provides a simulation current transformer wiring detection circuit, calibration simulation training device and system, which are closer to the real environment of mutual inductor calibration, realize the simulation training of mutual inductor detection wiring and calibration process, and provide new ideas and ways for the training and examination of mutual inductor detection personnel. In the simulation state, the personnel and equipment in the training process are safe, easy to master skills, and the teaching effect is supervised and checked. The students can learn and master the various error characteristics of mutual inductor miswiring under safe voltage, which is convenient for judgment and analysis in actual work.

[0007] In order to achieve the above object, the technical scheme adopted by the present application is: a simulation current transformer wiring detection circuit, comprising a current riser, a standard simulation current transformer, a measured simulation current transformer and a simulation transformer calibrator, the secondary side of the measured simulation current transformer is a measured parallel circuit composed of a resistor Rn and a diode Dn, and the two ends of the measured parallel circuit are respectively used as the first and second secondary wiring terminals of the measured simulation current transformer; the secondary side of the standard simulation current transformer is a standard parallel circuit composed of a resistor Rm and a diode Dm, and the two ends of the standard parallel circuit are respectively used as the first and second secondary wiring terminals of the standard simulation current transformer;

[0008] The secondary side of the current riser is connected with the second secondary wiring terminal of the measured simulation current transformer and the second secondary wiring terminal of the standard simulation current transformer, the second secondary wiring terminal of the measured simulation current transformer is further connected with the differential current measured terminal of the simulation transformer calibrator, the second secondary wiring terminal of the standard simulation current transformer is further connected with the differential current standard terminal of the simulation transformer calibrator, the first secondary wiring terminal of the measured simulation current transformer is connected with the first secondary wiring terminal of the standard simulation current transformer and the differential pressure standard terminal of the simulation transformer calibrator, and the differential pressure measured terminal of the simulation transformer calibrator is grounded;

[0009] A measured sampling voltage dividing circuit is arranged in series at the two ends of the measured parallel circuit, the output of the measured sampling voltage dividing circuit is connected with the AD sampling port 1 of the simulation transformer calibrator, and the wiring state of the measured simulation current transformer is judged according to the measured voltage dividing value sampled by the MCU of the simulation transformer calibrator;

[0010] When the measured voltage dividing value is a preset value I, it is determined that the secondary wiring of the measured simulation current transformer is normal;

[0011] When the measured voltage dividing value is a preset value II, it is determined that the secondary polarity of the measured simulation current transformer is reversed;

[0012] When the measured voltage dividing value is a preset value III, it is determined that the secondary wiring of the measured simulation current transformer is reversed;

[0013] When the measured voltage dividing value is a value other than the preset value I, the preset value II and the preset value III, it is determined that the transformation ratio of the measured simulation current transformer is wrong;

[0014] A standard sampling voltage dividing circuit is arranged in series at the two ends of the standard parallel circuit, the output of the standard sampling voltage dividing circuit is connected with the AD sampling port 2 of the simulation transformer calibrator, and the wiring state of the standard simulation current transformer is judged according to the standard voltage dividing value sampled by the MCU of the simulation transformer calibrator;

[0015] When the standard voltage division value is the preset value IV, it is determined that the secondary connection of the standard simulation current transformer is normal;

[0016] When the standard voltage division value is the preset value V, it is determined that the secondary polarity of the standard simulation current transformer is reversed;

[0017] When the standard voltage division value is the preset value III, it is determined that the secondary of the standard simulation current transformer is not connected;

[0018] When the standard voltage division value is a value other than the preset value IV, the preset value V and the preset value III, it is determined that the transformation ratio of the standard simulation current transformer is incorrect.

[0019] Based on the above, the measured sampling voltage division circuit includes a power supply, a resistor R1 and a resistor R2 connected in sequence, and the connection point between the resistor R1 and the resistor R2 is the output of the measured sampling voltage division circuit; the measured parallel circuit is connected in series between the resistor R1 and the output of the measured sampling voltage division circuit or connected in series between the power supply and the resistor R1, and the output of the measured sampling voltage division circuit is connected to the AD sampling port 1 of the simulation transformer calibrator through the resistor R3;

[0020] The standard sampling voltage division circuit includes a power supply, a resistor R4 and a resistor R5 connected in sequence, and the connection point between the resistor R4 and the resistor R5 is the output of the standard sampling voltage division circuit; the standard parallel circuit is connected in series between the resistor R4 and the output of the standard sampling voltage division circuit or connected in series between the power supply and the resistor R4, and the output of the standard sampling voltage division circuit is connected to the AD sampling port 2 of the simulation transformer calibrator through the resistor R6;

[0021] The preset value I=5*R2 / (R1+Rn+R2), unit: volt; the preset value II=(5-UDn)*R2 / (R1+R2), unit: volt; the preset value III=0, unit: volt; the preset value IV=5*R5 / (R4+Rm+R5), unit: volt; the preset value V=(5-UDm)*R5 / (R4+R5), unit: volt.

[0022] Based on the above, the measured sampling voltage division circuit includes a power supply, a resistor R1 and a resistor R2 connected in sequence, and the connection point between the resistor R1 and the resistor R2 is the output of the measured sampling voltage division circuit; the measured parallel circuit is connected in series between the output of the measured sampling voltage division circuit and the resistor R2 or connected in series between the resistor R2 and the ground, and the output of the measured sampling voltage division circuit is connected to the AD sampling port 1 of the simulation transformer calibrator through the resistor R3;

[0023] The standard sampling voltage division circuit comprises a power supply, a resistor R4 and a resistor R5 connected in sequence, and a connection point between the resistor R4 and the resistor R5 is an output of the standard sampling voltage division circuit; a standard parallel circuit is connected in series between the output of the standard sampling voltage division circuit and the resistor R5 or in series between the resistor R5 and the ground, and the output of the standard sampling voltage division circuit is connected to an AD sampling port 2 of the simulation transformer calibrator through a resistor R6;

[0024] The preset value I is 5*(Rn+R2) / (R1+Rn+R2), and the unit is volt; the preset value II is (5-UDn)*R2 / (R1+R2), and the unit is volt; the preset value III is 0, and the unit is volt; the preset value IV is 5*(Rm+R5) / (R4+Rm+R5), and the unit is volt; and the preset value V is (5-UDm)*R5 / (R4+R5), and the unit is volt.

[0025] The second aspect of the present application provides a transformer calibration simulation training device, comprising an operation auxiliary table and a control cabinet,

[0026] The operation auxiliary table is provided with a standard simulation current transformer, and the operation auxiliary table is further provided with a standard terminal T0, a plurality of measured simulation current transformer calibration stations and a calibration station switching module.

[0027] The standard simulation current transformer comprises a current riser and a plurality of parallel and corresponding secondary side circuits of different transformation ratios, each secondary side circuit is a standard parallel circuit composed of a resistor Rm and a diode Dm, and the resistors Rm of different secondary side circuits have different resistance values; two ends of each standard parallel circuit are a first secondary terminal and a second secondary terminal of the standard simulation current transformer, and each second secondary terminal K2 is connected with one secondary terminal of the current riser.

[0028] Each measured simulation current transformer calibration station comprises a secondary side circuit and two terminals S1 and S2, the secondary side circuit is a measured parallel circuit composed of a resistor Rn and a diode Dn, two ends of each measured parallel circuit are a first secondary terminal and a second secondary terminal of the measured simulation current transformer, and the second secondary terminal of the measured simulation current transformer is connected with the other secondary terminal of the current riser.

[0029] The calibration station switching module is used for connecting the first secondary terminal of the selected measured simulation current transformer with the first secondary terminal of the corresponding variable ratio of the standard simulation current transformer according to a selection instruction.

[0030] The control cabinet is provided with a simulation transformer calibrator, a simulation current transformer load box and a simulation voltage regulator, the simulation voltage regulator is connected with the standard simulation current transformer, the simulation current transformer load box is connected with the simulation voltage regulator and the simulation transformer calibrator respectively, two wiring terminals of the simulation current transformer load box are also connected in series to a connection circuit of the measured simulation current transformer and the simulation transformer calibrator, and the standard wiring terminal T0 and the wiring terminals S1 and S2 of the selected measured simulation current transformer test site are connected with a differential circuit of the simulation transformer calibrator respectively;

[0031] During the test, the first secondary wiring terminal of the measured simulation current transformer is connected with the S2 wiring terminal, the second secondary wiring terminal of the measured simulation current transformer is connected with the S1 wiring terminal, and the second secondary wiring terminal of the standard simulation current transformer corresponding to the variable ratio is connected with the standard wiring terminal T0.

[0032] The two wiring terminals S1 and S2 of the selected measured simulation current transformer test site are also connected with a measured sampling voltage dividing circuit respectively, and the output of the measured sampling voltage dividing circuit is connected with an AD sampling port 1 of the simulation transformer calibrator, so that the MCU of the simulation transformer calibrator judges the wiring state of the measured simulation current transformer according to the sampled measured voltage dividing value.

[0033] The standard wiring terminal T0 of the standard simulation current transformer corresponding to the variable ratio is connected with a standard sampling voltage dividing circuit, and the output of the standard sampling voltage dividing circuit is connected with an AD sampling port 2 of the simulation transformer calibrator; the MCU of the simulation transformer calibrator judges the wiring state of the standard simulation current transformer according to the sampled standard voltage dividing value.

[0034] The application also provides a transformer test simulation training system, which comprises a transformer test simulation training device and a college PC, the transformer test simulation training device is the aforementioned transformer test simulation training device, and ZIGBEE communication is established between the simulation current transformer load box of the transformer test simulation training device and the student PC to receive the load value range of the measured simulation current transformer set by the student PC and display the load value range, and the manually changed load value range is uploaded to the student PC.

[0035] ZIGBEE communication is established between the simulation transformer calibrator of the transformer test simulation training device and the student PC to receive the test parameters and error parameters sent by the student PC and display the test parameters and error parameters.

[0036] The trainee's PC is connected to the operation auxiliary console via ZIGBEE communication, which is used to output selection commands to the control verification station switching module to realize the switching of the verification station of the simulated current transformer under test.

[0037] This invention has outstanding substantive features and significant progress compared to the prior art. Specifically,

[0038] In this invention, both the standard simulated current transformer and the simulated current transformer under test use a parallel circuit composed of resistors and diodes to simulate the secondary circuit. Since there is no iron core and coil, no real voltage or current passes through, which will not cause dangers such as open circuit of the secondary side of the current transformer. The AD voltage sampling signals applied to the terminals are all below DC 5V, making the operation safer.

[0039] This invention integrates a sampling circuit and a connection circuit between the simulated current transformer under test and the standard simulated current transformer internally, so that only simple wiring terminals are provided externally. This means that the simulated current transformer under test does not have external power lines and communication lines, making it closer to the real field.

[0040] The panoramic simulation instrument transformer calibration training system of this invention can simulate the actual working environment to calibrate the accuracy of instrument transformers, and can provide real-time and safe training and assessment for trainees without harming personnel or equipment. Throughout the entire calibration process, from wiring the instrument transformer to basic error testing to printing the calibration certificate, operators complete the process in a safe voltage environment, fully ensuring the safety of both personnel and equipment. The simulated instrument transformer calibration scenario strives to closely resemble the real equipment calibration environment and operating procedures, with no redundant wiring, allowing operators to see and learn directly, thus improving the realism and effectiveness of the training. Attached Figure Description

[0041] Figure 1 This is a schematic diagram of a wiring circuit according to Embodiment 1 of the present invention.

[0042] Figure 2 This is another wiring circuit diagram of Embodiment 1 of the present invention.

[0043] Figure 3 This is a schematic diagram of the control cabinet structure of Embodiment 3 of the present invention.

[0044] Figure 4 This is a schematic diagram of the operation auxiliary table structure in Embodiment 3 of the present invention.

[0045] Figure 5 This is a principle block diagram of Embodiment 3 of the present invention.

[0046] Figure 6 This is the connection diagram for current transformer calibration.

[0047] Figure 7is the connection diagram of the sampling circuit.

[0048] Figure 8 is the principle block diagram of the transformer calibration simulation training system.

[0049] In the figure, 1. Control cabinet; 2. Simulation transformer calibrator; 3. Start button; 4. Stop button; 5. Emergency stop button; 6. Simulation current transformer load box; 7. Simulation voltage regulator; 8. Operation auxiliary table. DETAILED DESCRIPTION

[0050] The technical solutions of the present application are described in further detail below through specific embodiments.

[0051] Example 1

[0052] As shown in Figure 1 and Figure 2 , the present application provides a simulation current transformer wiring detection circuit, which comprises a current riser, a standard simulation current transformer, a measured simulation current transformer and a simulation transformer calibrator, the secondary side of the measured simulation current transformer is a measured parallel circuit composed of a resistor Rn and a diode Dn, and the two ends of the measured parallel circuit are respectively taken as the first and second secondary wiring terminals K1 and K2 of the measured simulation current transformer; the secondary side of the standard simulation current transformer is a standard parallel circuit composed of a resistor Rm and a diode Dm, and the two ends of the standard parallel circuit are respectively taken as the first and second secondary wiring terminals K1 and K2 of the standard simulation current transformer;

[0053] The secondary side of the current riser is connected with the second secondary wiring terminal K2 of the measured simulation current transformer and the second secondary wiring terminal K2 of the standard simulation current transformer respectively, the second secondary wiring terminal K2 of the measured simulation current transformer is further connected with the differential current measured terminal Tx of the simulation transformer calibrator, the second secondary wiring terminal K2 of the standard simulation current transformer is further connected with the differential current standard terminal T0 of the simulation transformer calibrator, the first secondary wiring terminal K1 of the measured simulation current transformer is connected with the first secondary wiring terminal K1 of the standard simulation current transformer and the differential pressure standard terminal K of the simulation transformer calibrator, and the differential pressure measured terminal D of the simulation transformer calibrator is grounded;

[0054] A measured sampling voltage dividing circuit is arranged in series at the two ends of the measured parallel circuit, the output of the measured sampling voltage dividing circuit is connected with the AD sampling port 1 of the simulation transformer calibrator, and the wiring state of the measured simulation current transformer is judged by the MCU of the simulation transformer calibrator according to the sampled measured voltage dividing value;

[0055] A standard sampling voltage dividing circuit is arranged in series at both ends of the standard parallel circuit, and the output of the standard sampling voltage dividing circuit is connected with the AD sampling port 2 of the simulation transformer calibrator, and the MCU of the simulation transformer calibrator judges the connection state of the standard simulation current transformer according to the sampled standard voltage dividing value.

[0056] In the specific implementation, as shown in Figure 1 and Figure 2 , the measured sampling voltage dividing circuit comprises a power supply, a resistor R1 and a resistor R2 connected in sequence, and the connection point between the resistor R1 and the resistor R2 is the output of the measured sampling voltage dividing circuit; the measured parallel circuit is connected in series between the resistor R1 and the output of the measured sampling voltage dividing circuit or connected in series between the power supply and the resistor R1, and the output of the measured sampling voltage dividing circuit is connected with the AD sampling port 1 of the simulation transformer calibrator through a resistor R3.

[0057] The specific steps of judging the connection state of the measured simulation current transformer by the MCU of the simulation transformer calibrator according to the sampled measured voltage dividing value are as follows:

[0058] When the measured voltage dividing value is a preset value I=5*R2 / (R1+Rn+R2), it is determined that the secondary connection of the measured simulation current transformer is normal;

[0059] When the measured voltage dividing value is a preset value II=(5-UDn)*R2 / (R1+R2) with unit of volt, it is determined that the secondary polarity of the measured simulation current transformer is reversed;

[0060] When the measured voltage dividing value is a preset value III=0 with unit of volt, it is determined that the secondary of the measured simulation current transformer is not connected;

[0061] When the measured voltage dividing value is a value other than the preset value I, the preset value II and the preset value III, it is determined that the transformation ratio of the measured simulation current transformer is wrong.

[0062] Similarly, in the specific implementation, the standard sampling voltage dividing circuit comprises a power supply, a resistor R4 and a resistor R5 connected in sequence, and the connection point between the resistor R4 and the resistor R5 is the output of the standard sampling voltage dividing circuit; the standard parallel circuit is connected in series between the resistor R4 and the output of the standard sampling voltage dividing circuit or connected in series between the power supply and the resistor R4, and the output of the standard sampling voltage dividing circuit is connected with the AD sampling port 2 of the simulation transformer calibrator through a resistor R6;

[0063] The specific steps of judging the connection state of the standard simulation current transformer by the MCU of the simulation transformer calibrator according to the sampled standard voltage dividing value are as follows:

[0064] When the standard voltage division value is a preset value IV=5*R5 / (R4+Rm+R5), unit: volt, it is determined that the secondary connection of the standard simulation current transformer is normal;

[0065] When the standard voltage division value is a preset value V=(5-UDm)*R5 / (R4+R5), unit: volt, it is determined that the secondary polarity of the standard simulation current transformer is reversed;

[0066] When the standard voltage division value is a preset value III=0, unit: volt, it is determined that the secondary of the standard simulation current transformer is not connected;

[0067] When the standard voltage division value is a value other than the preset value IV, the preset value V and the preset value III, it is determined that the transformation ratio of the standard simulation current transformer is incorrect.

[0068] Embodiment 2

[0069] The difference between this embodiment and embodiment 1 is that:

[0070] The measured sampling voltage division circuit comprises a power supply, a resistor R1 and a resistor R2 connected in sequence, and the connection point between the resistor R1 and the resistor R2 is the output of the measured sampling voltage division circuit; the measured parallel circuit is connected in series between the output of the measured sampling voltage division circuit and the resistor R2 or between the resistor R2 and the ground, and the output of the measured sampling voltage division circuit is connected to the AD sampling port 1 of the simulation transformer calibrator through the resistor R3;

[0071] The specific steps of the MCU of the simulation transformer calibrator for judging the connection state of the measured simulation current transformer according to the sampled measured voltage division value are as follows:

[0072] When the measured voltage division value is a preset value 5*(Rn+R2) / (R1+Rn+R2), unit: volt, it is determined that the secondary connection of the measured simulation current transformer is normal;

[0073] When the measured voltage division value is a preset value II=(5-UDn)*R2 / (R1+R2), unit: volt, it is determined that the secondary polarity of the measured simulation current transformer is reversed;

[0074] When the measured voltage division value is a preset value III=0, unit: volt, it is determined that the secondary of the measured simulation current transformer is not connected;

[0075] When the measured voltage division value is a value other than the preset value I, the preset value II and the preset value III, it is determined that the transformation ratio of the measured simulation current transformer is incorrect.

[0076] Specifically, the standard sampling voltage divider circuit includes a power supply, resistor R4, and resistor R5 connected in sequence. The connection point between resistor R4 and resistor R5 is the output of the standard sampling voltage divider circuit. The standard parallel circuit is connected in series between the output of the standard sampling voltage divider circuit and resistor R5 or in series between resistor R5 and ground. The output of the standard sampling voltage divider circuit is connected to the AD sampling port 2 of the simulated transformer calibrator through resistor R6.

[0077] The specific steps by which the MCU of the simulated current transformer calibrator determines the wiring status of the standard simulated current transformer based on the sampled standard voltage divider value are as follows:

[0078] When the standard voltage divider value is the preset value IV=5*(Rm+R5) / (R4+ Rm+R5), in volts, the secondary wiring of the standard simulated current transformer is determined to be normal.

[0079] When the standard voltage divider value is the preset value V=(5-UDm)* R5 / (R4+ R5), in volts, it is determined that the secondary polarity of the standard simulated current transformer is reversed.

[0080] When the standard voltage divider value is preset value III=0, and the unit is volts, it is determined that the secondary side of the standard simulated current transformer is unconnected.

[0081] When the standard voltage divider value is any value other than preset value IV, preset value V, or preset value III, the transformation ratio of the standard simulated current transformer is determined to be incorrect.

[0082] Example 3

[0083] This embodiment provides a current transformer calibration simulation training device, such as... Figures 3-7 As shown, it includes an operation auxiliary console 8 and a control cabinet 4.

[0084] The operation auxiliary platform 8 is equipped with a standard simulated current transformer. The operation auxiliary platform 8 is also equipped with a standard terminal block T0, multiple test simulation current transformer calibration stations, and a calibration station switching module.

[0085] The standard simulated current transformer includes a current booster and multiple parallel secondary circuits with different turns ratios. Each secondary circuit is a standard parallel circuit composed of a resistor Rm and a diode Dm. The resistance value of the resistor Rm is different for different secondary circuits. The two ends of each standard parallel circuit are the first secondary terminal K1 and the second secondary terminal K2 of the standard simulated current transformer. Each second secondary terminal K2 is connected to one of the secondary terminals of the current booster.

[0086] Each measured simulation current transformer test station comprises a secondary circuit and two connection terminals S1 and S2, the secondary circuit is a measured parallel circuit composed of a resistor Rn and a diode Dn, two ends of each measured parallel circuit are the first and second secondary connection terminals K1 and K2 of the measured simulation current transformer, the second secondary connection terminal K2 of the measured simulation current transformer is connected with another secondary connection terminal of the current riser;

[0087] The test station switching module is used for connecting the first secondary connection terminal K1 of the selected measured simulation current transformer with the first secondary connection terminal K1 of the standard simulation current transformer with corresponding variable ratio according to the selection instruction;

[0088] The control cabinet 1 is provided with a simulation transformer calibrator 2, a simulation current transformer load box 6 and a simulation voltage regulator 7, the simulation voltage regulator 7 is connected with the standard simulation current transformer, the simulation current transformer load box 6 is connected with the simulation voltage regulator 7 and the simulation transformer calibrator 2 respectively, two connection terminals of the simulation current transformer load box 6 are also connected in series to a connection circuit of the measured simulation current transformer and the simulation transformer calibrator 2, the standard connection terminal T0 and the connection terminals S1 and S2 of the selected measured simulation current transformer test station are connected with a differential circuit of the simulation transformer calibrator 2 respectively;

[0089] The control cabinet 1 is provided with a simulation transformer calibrator 2, a simulation current transformer load box 6 and a simulation voltage regulator 7, the simulation voltage regulator 7 is connected with the standard simulation current transformer, the simulation current transformer load box 6 is connected with the simulation voltage regulator 7 and the simulation transformer calibrator 2 respectively, two connection terminals of the simulation current transformer load box 6 are also connected in series to a connection circuit of the measured simulation current transformer and the simulation transformer calibrator 2, the standard connection terminal T0 and the connection terminals S1 and S2 of the selected measured simulation current transformer test station are connected with a differential circuit of the simulation transformer calibrator 2 respectively;

[0090] During testing, the first secondary connection terminal K1 of the measured simulation current transformer is connected with the S2 connection terminal, the second secondary connection terminal K2 of the measured simulation current transformer is connected with the S1 connection terminal, and the second secondary connection terminal K2 of the standard simulation current transformer with corresponding variable ratio is connected with the standard connection terminal T0;

[0091] The two connection terminals S1 and S2 of the selected measured simulation current transformer test station are also connected with a measured sampling voltage dividing circuit respectively, an output of the measured sampling voltage dividing circuit is connected with an AD sampling port 1 of the simulation transformer calibrator, so that an MCU of the simulation transformer calibrator judges the connection state of the measured simulation current transformer according to the sampled measured voltage dividing value;

[0092] The corresponding variable ratio standard terminal T0 of the standard simulation current transformer is connected with the terminal S2 of the standard simulation current transformer test site and a standard sampling voltage dividing circuit, the output of the standard sampling voltage dividing circuit is connected with the AD sampling port 2 of the simulation transformer calibrator, and the MCU of the simulation transformer calibrator judges the connection state of the standard simulation current transformer according to the sampled standard voltage dividing value.

[0093] It can be understood that, as shown in Figure 5 The two terminals S1 and S2 of the selected simulation current transformer test site and the standard terminal T0 of the standard simulation current transformer are connected with the differential circuit of the simulation transformer calibrator, which includes:

[0094] The terminal S1 of the selected simulation current transformer test site is connected with the differential current measured terminal Tx of the control cabinet;

[0095] The terminal S2 of the selected simulation current transformer test site is connected with the differential pressure standard terminal K of the control cabinet;

[0096] The standard terminal T0 of the standard simulation current transformer is connected with the differential current standard terminal T0 of the control cabinet;

[0097] In the control cabinet 1, the differential current standard terminal T0 of the control cabinet 1 is connected with the differential current standard terminal T0 of the simulation transformer calibrator 2, the differential current measured terminal Tx of the simulation transformer calibrator 2 is connected with the Z1 terminal of the simulation current transformer load box 6, the Z2 terminal of the simulation current transformer load box 6 is connected with the differential current measured terminal Tx of the control cabinet 1, the differential pressure measured terminal D of the simulation transformer calibrator 2 is connected with the differential pressure measured terminal D of the control cabinet 1, the differential pressure standard terminal K of the simulation transformer calibrator 2 is connected with the differential pressure standard terminal K of the control cabinet 1, the differential pressure measured terminal D of the control cabinet 1 is grounded, and the differential current measured terminal Tx of the control cabinet 1 is grounded.

[0098] Specifically, the MCU of the simulation transformer calibrator 2 judges the connection state of the simulation current transformer according to the sampled measured voltage dividing value:

[0099] When the measured voltage dividing value is a preset value I, it is determined that the secondary connection of the simulation current transformer is normal, when the measured voltage dividing value is a preset value II, it is determined that the secondary polarity of the simulation current transformer is reversed, when the measured voltage dividing value is a preset value III, it is determined that the secondary of the simulation current transformer is not connected, and when the measured voltage dividing value is a value other than the preset value I, the preset value II and the preset value III, it is determined that the variable ratio of the simulation current transformer is wrong.

[0100] The MCU of the simulation transformer calibrator 2 judges the connection state of the standard simulation current transformer according to the sampled standard voltage division value:

[0101] When the standard voltage division value is the preset value IV, it is determined that the secondary connection of the standard simulation current transformer is normal; when the standard voltage division value is the preset value V, it is determined that the secondary polarity of the standard simulation current transformer is reversed; when the standard voltage division value is the preset value III, it is determined that the secondary of the standard simulation current transformer is not connected; when the standard voltage division value is a value other than the preset value IV, the preset value V and the preset value III, it is determined that the transformation ratio of the standard simulation current transformer is incorrect.

[0102] In an embodiment, the measured sampling voltage division circuit includes a power supply, a resistor R1 and a resistor R2 connected in sequence, and the connection point between the resistor R1 and the resistor R2 is the output of the measured sampling voltage division circuit; the measured parallel circuit is connected in series between the resistor R1 and the output of the measured sampling voltage division circuit or connected in series between the power supply and the resistor R1, and the output of the measured sampling voltage division circuit is connected to the AD sampling port 1 of the simulation transformer calibrator 2 through a resistor R3;

[0103] The standard sampling voltage division circuit includes a power supply, a resistor R4 and a resistor R5 connected in sequence, and the connection point between the resistor R4 and the resistor R5 is the output of the standard sampling voltage division circuit; the standard parallel circuit is connected in series between the resistor R4 and the output of the standard sampling voltage division circuit or connected in series between the power supply and the resistor R4, and the output of the standard sampling voltage division circuit is connected to the AD sampling port 2 of the simulation transformer calibrator 2 through a resistor R6;

[0104] At this time, the preset value I = 5*R2 / (R1+Rn+R2), unit: volt; the preset value II = (5-UDn)*R2 / (R1+R2), unit: volt; the preset value III = 0, unit: volt; the preset value IV = 5*R5 / (R4+Rm+R5), unit: volt; the preset value V = (5-UDm)*R5 / (R4+R5), unit: volt.

[0105] In another embodiment, the measured sampling voltage division circuit includes a power supply, a resistor R1 and a resistor R2 connected in sequence, and the connection point between the resistor R1 and the resistor R2 is the output of the measured sampling voltage division circuit; the measured parallel circuit is connected in series between the output of the measured sampling voltage division circuit and the resistor R2 or connected in series between the resistor R2 and the ground, and the output of the measured sampling voltage division circuit is connected to the AD sampling port 1 of the simulation transformer calibrator 2 through a resistor R3;

[0106] The standard sampling voltage division circuit comprises a power supply, a resistor R4 and a resistor R5 connected in sequence, and a connection point between the resistor R4 and the resistor R5 is an output of the standard sampling voltage division circuit; a standard parallel circuit is connected in series between the output of the standard sampling voltage division circuit and the resistor R5 or in series between the resistor R5 and the ground, and the output of the standard sampling voltage division circuit is connected to an AD sampling port 2 of the simulation transformer calibrator 2 through a resistor R6.

[0107] At this time, the preset value I = 5 * (Rn + R2) / (R1 + Rn + R2) is in volts; the preset value II = (5 - UDn) * R2 / (R1 + R2) is in volts; the preset value III = 0 is in volts; the preset value IV = 5 * (Rm + R5) / (R4 + Rm + R5) is in volts; and the preset value V = (5 - UDm) * R5 / (R4 + R5) is in volts.

[0108] Embodiment 4

[0109] The difference between the embodiment and the embodiment 3 is that different measured simulation current transformers have different transformation ratios, and the voltage division resistors Rn in the different measured simulation current transformers CTx have different values.

[0110] When the wiring state detection of the measured simulation current transformer is performed, the MCU chip of the simulation transformer calibrator 2 determines whether the measured simulation current transformer to be tested is accessed according to the voltage value sampled by the AD sampling port 1.

[0111] The standard simulation current transformers have different transformation ratios, and the voltage division resistors Rm of the standard simulation current transformers CT0 with different transformation ratios have different values. When the wiring state detection of the standard simulation current transformer is performed, the MCU chip of the simulation transformer calibrator 2 determines whether the transformation ratio of the accessed standard simulation current transformer is correct according to the voltage value sampled by the AD sampling port 2.

[0112] Table 1: Simulation transformer calibrator AD sampling resistance configuration and voltage value

[0113]

[0114] Table 2: Device can determine transformer wiring condition combination

[0115]

[0116] Table 1 gives the relationship between the simulation transformer calibrator AD sampling resistance configuration and the voltage value, and Table 2 gives the device can determine transformer wiring condition combination.

[0117] Embodiment 5

[0118] The embodiment gives a specific example, sets the existing variable ratio of 100:5 and the variable ratio of 200:5 two measured simulation current transformers, the variable ratio of 100:5 measured simulation current transformer secondary built-in voltage dividing resistor Rn1 is 5.1K, the variable ratio of 200:5 measured simulation current transformer secondary built-in voltage dividing resistor Rn2 is 10K, the R1 in the CTx voltage dividing sampling circuit is 10k, and the R2 is 10k.

[0119] In the test, the measured simulation current transformer of 100:5 is the test object, the wiring is carried out according to Figure 1 and Figure 5 .

[0120] When the first and second secondary wiring terminals K1 and K2 of the measured simulation current transformer with the variable ratio of 100:5 are connected to the operation auxiliary table, the voltage U=5*10 / (10+5.1+10)=1.99V collected by the MCU chip of the simulation transformer calibrator through the AD sampling port 1 is determined to be normal, and the wiring result: normal is displayed on the display screen of the simulation transformer calibrator.

[0121] When the first and second secondary wiring terminals K1 and K2 of the measured simulation current transformer with the variable ratio of 200:5 are connected to the operation auxiliary table, the voltage U=5*10 / (10+5.1+10)=1.99V collected by the MCU chip of the simulation transformer calibrator through the AD sampling port 1 is determined to be normal, and the wiring result: normal is displayed on the display screen of the simulation transformer calibrator.

[0122] When the first and second secondary wiring terminals K1 and K2 of the measured simulation current transformer with the variable ratio of 100:5 are connected to the operation auxiliary table, the voltage U=5*10 / (10+5.1+10)=1.99V collected by the MCU chip of the simulation transformer calibrator through the AD sampling port 1 is determined to be normal, and the wiring result: normal is displayed on the display screen of the simulation transformer calibrator.

[0123] When the first and second secondary wiring terminals K1 and K2 of the measured simulation current transformer with the variable ratio of 100:5 are connected to the operation auxiliary table, the voltage U=5*10 / (10+5.1+10)=1.99V collected by the MCU chip of the simulation transformer calibrator through the AD sampling port 1 is determined to be normal, and the wiring result: normal is displayed on the display screen of the simulation transformer calibrator.

[0124] Similarly, the secondary built-in voltage dividing resistor Rm1 of the standard simulation current transformer with the variable ratio of 100:5 is set to 68K, the secondary built-in voltage dividing resistor Rn2 of the variable ratio of 200:5 is set to 120K, the R4 in the CT0 voltage dividing sampling circuit is 10k, and the R5 is 10k, according toFigure 1 and Figure 5 Perform the wiring.

[0125] When the primary and secondary terminals K1 and K2 of the standard simulated current transformer 100:5 are connected to the operating auxiliary console, the MCU chip of the simulated transformer calibrator 2 collects a voltage U=5*10 / (10+68+10)=0.56V through the AD sampling port 2, which determines that the wiring is normal, and displays the wiring result as normal on the display screen of the simulated transformer calibrator 2.

[0126] When the first and second secondary terminals K1 and K2 of the standard simulated current transformer 200:5 are connected to the operating auxiliary console, the MCU chip of the simulated transformer calibrator 2 collects the voltage U=5*10 / (10+120+10)=0.35V through the AD sampling port 2, determines that the transformation ratio is incorrect, and displays the wiring result on the display screen of the simulated transformer calibrator 2: transformation ratio error;

[0127] When the primary and secondary terminals K1 and K2 of the standard simulated current transformer 100:5 are swapped and connected to the operation auxiliary console, the MCU chip of the simulated transformer calibrator 2 collects the voltage U=(5-0.4)*10 / (10+10)=2.3V through the AD sampling port 2, determines that the polarity is reversed, and displays the wiring result on the display screen of the simulated transformer calibrator 2: reversed polarity;

[0128] When the primary and secondary terminals K1 and K2 of the standard simulated current transformer 100:5 are missing wires, the MCU chip of the simulated transformer calibrator 2 will collect a voltage U=0 through the AD sampling port 2, in volts, and determine that the wiring is invalid or missing. The wiring result will be displayed on the screen of the simulated transformer calibrator 2 as: invalid wiring or missing wiring.

[0129] Example 6

[0130] This embodiment provides a current transformer calibration simulation training system, such as... Figure 8 As shown, it includes a current transformer calibration simulation training device and a student PC. The current transformer calibration simulation training device is the aforementioned current transformer calibration simulation training device. The simulation current transformer load box 6 of the current transformer calibration simulation training device communicates with the student PC via ZIGBEE to receive and display the load value range of the simulated current transformer under test set by the student PC, and to upload the manually changed load value range to the student PC.

[0131] The simulated transformer calibrator 2 of the transformer calibration simulation training device communicates with the student's PC via ZIGBEE, receiving and displaying the calibration parameters and error parameters sent by the student's PC.

[0132] The student PC is connected with the operation auxiliary station 8 through ZIGBEE communication, and is used for controlling the switching of the current transformer test station.

[0133] Two existing measured simulation current transformers are set, and the transformation ratios are 100:5 and 200:5 respectively. The measured simulation current transformer with the transformation ratio of 100:5 is selected for test. The operator connects the measured simulation current transformer at a test station of the operation auxiliary station, for example, Figure 4 The measured simulation current transformer, the standard simulation current transformer and the operation auxiliary station are correctly connected.

[0134] The software interface of the student PC selects the type of the tested transformer as a current transformer, selects a test station, inputs the test parameter information such as the transformer asset number, factory number, manufacturer, transformation ratio, rated load, lower limit load, polarity, accuracy grade and the like, clicks the "start test" button, clicks the "connection check" button in the tool bar, enters the connection check interface, and clicks the "start" button. The system automatically detects and returns the connection and polarity of the measured simulation current transformer and the standard simulation current transformer, and automatically judges whether the connection check test is qualified.

[0135] The basic error test interface is entered, the "start" button is clicked, the error test is performed, the system automatically generates the qualified data according to the selected parameters and the polarity connection check. If the connection check result shows normal, the ratio difference and the angle difference of each measurement point of the transformer are qualified and within the error limit range. If the connection check result shows error, the ratio difference and the angle difference of each measurement point of the transformer are shown as out-of-tolerance and unqualified. After the test is completed, the test data is saved, the historical data can be inquired, and the test certificate (test result notice) can be printed.

[0136] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application rather than limit them; although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the specific embodiments of the present application can be modified or some technical features can be replaced by equivalent ones; without departing from the spirit of the technical solutions of the present application, they should be covered in the technical solution range of the present application.

Claims

1. A simulation current transformer wiring detection circuit, characterized in that: The system includes a current booster, a standard simulated current transformer, a simulated current transformer under test, and a simulated current transformer calibrator. The secondary side of the simulated current transformer under test is a parallel circuit composed of a resistor Rn and a diode Dn, with the two ends of the parallel circuit serving as the first and second secondary terminals of the simulated current transformer under test, respectively. The secondary side of the standard simulated current transformer is a standard parallel circuit composed of a resistor Rm and a diode Dm, with the two ends of the standard parallel circuit serving as the first and second secondary terminals of the standard simulated current transformer, respectively. The secondary side of the current booster is connected to the second secondary terminals of the simulated current transformer under test and the second secondary terminals of the standard simulated current transformer. The second secondary terminals of the simulated current transformer under test are also connected to the differential current test terminal of the simulated current transformer calibrator. The second secondary terminals of the standard simulated current transformer are also connected to the differential current standard terminal of the simulated current transformer calibrator. The first secondary terminals of the simulated current transformer under test are connected to the first secondary terminals of the standard simulated current transformer and the differential pressure standard terminal of the simulated current transformer calibrator. The differential pressure test terminal of the simulated current transformer calibrator is grounded. A voltage divider circuit is connected in series across the two ends of the parallel circuit under test, and the output of the voltage divider circuit is connected to the AD sampling port 1 of the simulated current transformer calibrator. The MCU of the simulated current transformer calibrator determines the wiring status of the simulated current transformer under test based on the sampled voltage divider value. When the measured voltage is the preset value I, it is determined that the secondary wiring of the simulated current transformer under test is normal. When the measured voltage divider value is the preset value II, it is determined that the secondary polarity of the simulated current transformer under test is reversed. When the measured voltage divider value is the preset value III, it is determined that the secondary winding of the simulated current transformer under test is unconnected. When the measured voltage divider value is a value other than preset value I, preset value II, or preset value III, the turns ratio of the simulated current transformer under test is determined to be incorrect. A standard sampling voltage divider circuit is connected in series across the two ends of the standard parallel circuit, and the output of the standard sampling voltage divider circuit is connected to the AD sampling port 2 of the simulation transformer calibrator. The MCU of the simulation transformer calibrator determines the wiring status of the standard simulation current transformer based on the sampled standard voltage divider value. When the standard voltage divider value is the preset value IV, the secondary wiring of the standard simulated current transformer is determined to be normal. When the standard voltage divider value is the preset value V, it is determined that the secondary polarity of the standard simulated current transformer is reversed; When the standard voltage divider value is the preset value III, it is determined that the secondary winding of the standard simulated current transformer is unconnected. When the standard voltage divider value is any value other than the preset value IV, preset value V, or preset value III, the transformation ratio of the standard simulated current transformer is determined to be incorrect.

2. The simulated current transformer wiring detection circuit according to claim 1, characterized in that: The tested sampling voltage divider circuit includes a power supply, resistor R1 and resistor R2 connected in sequence. The connection point between resistor R1 and resistor R2 is the output of the tested sampling voltage divider circuit. The tested parallel circuit is connected in series between resistor R1 and the output of the tested sampling voltage divider circuit or in series between the power supply and resistor R1. The output of the tested sampling voltage divider circuit is connected to the AD sampling port 1 of the simulated transformer calibrator through resistor R3. The standard sampling voltage divider circuit includes a power supply, resistor R4 and resistor R5 connected in sequence. The connection point between resistor R4 and resistor R5 is the output of the standard sampling voltage divider circuit. The standard parallel circuit is connected in series between resistor R4 and the output of the standard sampling voltage divider circuit or in series between the power supply and resistor R4. The output of the standard sampling voltage divider circuit is connected to the AD sampling port 2 of the simulation transformer calibrator through resistor R6. Among them, the preset value I = 5*R2 / (R1+Rn+R2), the unit is volt; the preset value II = (5-UDn)*R2 / (R1+R2), the unit is volt; the preset value III = 0, the unit is volt; the preset value IV = 5*R5 / (R4+Rm+R5), the unit is volt; the preset value V = (5-UDm)*R5 / (R4+R5), the unit is volt.

3. The simulated current transformer wiring detection circuit according to claim 1, characterized in that: The tested sampling voltage divider circuit includes a power supply, resistor R1, and resistor R2 connected in sequence. The connection point between resistor R1 and resistor R2 is the output of the tested sampling voltage divider circuit. The tested parallel circuit is connected in series between the output of the tested sampling voltage divider circuit and resistor R2 or in series between resistor R2 and ground. The output of the tested sampling voltage divider circuit is connected to the AD sampling port 1 of the simulated transformer calibrator through resistor R3. The standard sampling voltage divider circuit includes a power supply, resistor R4 and resistor R5 connected in sequence. The connection point between resistor R4 and resistor R5 is the output of the standard sampling voltage divider circuit. The standard parallel circuit is connected in series between the output of the standard sampling voltage divider circuit and resistor R5 or in series between resistor R5 and ground. The output of the standard sampling voltage divider circuit is connected to the AD sampling port 2 of the simulation transformer calibrator through resistor R6. Preset value I = 5 * (Rn + R2) / (R1 + Rn + R2), unit is volt; Preset value II = (5 - UDn) * R2 / (R1 + R2), unit is volt; Preset value III = 0, unit is volt; Preset value IV = 5 * (Rm + R5) / (R4 + Rm + R5), unit is volt; Preset value V = (5 - UDm) * R5 / (R4 + R5), unit is volt.

4. A current transformer calibration simulation training device, characterized in that: Includes an operator's console and a control cabinet. The operation auxiliary console is equipped with a standard simulated current transformer. The operation auxiliary console is also equipped with a standard terminal block T0, multiple test simulation current transformer calibration stations, and a calibration station switching module. The standard simulated current transformer includes a current booster and multiple parallel secondary circuits with different turns ratios. Each secondary circuit is a standard parallel circuit composed of a resistor Rm and a diode Dm. The resistance value of the resistor Rm is different for different secondary circuits. The two ends of each standard parallel circuit are the first and second secondary terminals of the standard simulated current transformer. Each second secondary terminal is connected to one of the secondary terminals of the current booster. Each test simulation current transformer calibration station includes one secondary side circuit and two terminals S1 and S2. The secondary side circuit is a test parallel circuit composed of resistor Rn and diode Dn. The two ends of each test parallel circuit are the first secondary terminal and the second secondary terminal of the test simulation current transformer. The second secondary terminal of the test simulation current transformer is connected to the other secondary terminal of the current booster. The calibration station switching module is used to connect the first and second terminals of the selected simulated current transformer under test to the first and second terminals of the standard simulated current transformer with the corresponding transformation ratio according to the selection command. The control cabinet is equipped with a simulated current transformer calibrator, a simulated current transformer load box, and a simulated voltage regulator. The simulated voltage regulator is connected to the standard simulated current transformer. The simulated current transformer load box is connected to both the simulated voltage regulator and the simulated current transformer calibrator. The two terminals of the simulated current transformer load box are also connected in series to the connection circuit between the simulated current transformer under test and the simulated current transformer calibrator. The standard terminal T0 and the terminals S1 and S2 of the selected simulated current transformer under test calibration station are respectively connected to the differential circuit of the simulated current transformer calibrator. During testing, the primary and secondary terminals of the simulated current transformer under test are connected to the S2 terminal, and the secondary terminals of the simulated current transformer under test are connected to the S1 terminal; the secondary terminals of the standard simulated current transformer with the corresponding ratio are connected to the standard terminal T0. The two terminals S1 and S2 of the selected test simulation current transformer calibration station are also connected to the test sampling voltage divider circuit, and the output of the test sampling voltage divider circuit is connected to the AD sampling port 1 of the simulation transformer calibrator, so that the MCU of the simulation transformer calibrator can determine the wiring status of the test simulation current transformer based on the sampled test voltage divider value. The corresponding ratio standard terminal T0 of the standard simulated current transformer is connected to the terminal S2 of the selected test station of the simulated current transformer and the standard sampling voltage divider circuit. The output of the standard sampling voltage divider circuit is connected to the AD sampling port 2 of the simulated current transformer calibrator. The MCU of the simulated current transformer calibrator determines the wiring status of the standard simulated current transformer based on the sampled standard voltage divider value.

5. The current transformer calibration simulation training device according to claim 4, characterized in that, The two terminals S1 and S2 of the selected test simulation current transformer calibration station and the standard terminal T0 of the standard simulation current transformer are connected to the differential circuit of the simulation transformer calibrator, including: The terminal S1 of the selected test simulation current transformer calibration station is connected to the differential current test terminal of the control cabinet. The terminal S2 of the selected test simulation current transformer calibration station is connected to the differential pressure standard terminal of the control cabinet; The standard terminal T0 of the standard simulated current transformer is connected to the differential current standard terminal on the control cabinet. Specifically, inside the control cabinet, the differential current standard terminal of the control cabinet is connected to the T0 terminal of the simulated current transformer calibrator; the differential current test terminal of the simulated current transformer calibrator is connected to the Z1 terminal of the simulated current transformer load box; the Z2 terminal of the simulated current transformer load box is connected to the differential current test terminal of the control cabinet; the differential pressure test terminal of the simulated current transformer calibrator is connected to the differential pressure test terminal of the control cabinet; the differential pressure standard terminal of the simulated current transformer calibrator is connected to the differential pressure standard terminal of the control cabinet; the differential pressure test terminal of the control cabinet is grounded; and the differential current test terminal of the control cabinet is grounded.

6. The current transformer calibration simulation training device according to claim 4, characterized in that, The MCU of the simulated current transformer calibrator determines the wiring status of the simulated current transformer under test based on the sampled voltage divider value: When the measured voltage is the preset value I, it is determined that the secondary wiring of the simulated current transformer under test is normal; when the measured voltage is the preset value II, it is determined that the secondary polarity of the simulated current transformer under test is reversed; when the measured voltage is the preset value III, it is determined that the secondary wiring of the simulated current transformer under test is not connected. When the measured voltage divider value is a value other than preset value I, preset value II, or preset value III, the turns ratio of the simulated current transformer under test is determined to be incorrect. The MCU of the simulated current transformer calibrator determines the wiring status of the standard simulated current transformer based on the sampled standard voltage divider value: When the standard voltage divider value is the preset value IV, the secondary wiring of the standard simulated current transformer is determined to be normal; when the standard voltage divider value is the preset value V, the secondary polarity of the standard simulated current transformer is determined to be reversed; when the standard voltage divider value is the preset value III, the secondary wiring of the standard simulated current transformer is determined to be unconnected. When the standard voltage divider value is any value other than the preset value IV, preset value V, or preset value III, the transformation ratio of the standard simulated current transformer is determined to be incorrect.

7. The current transformer calibration simulation training device according to claim 6, characterized in that: Different simulated current transformers under test have different transformation ratios, and the resistance Rn inside different simulated current transformers under test has different values. When performing wiring status detection on the simulated current transformer under test, the MCU chip of the simulated transformer calibrator determines whether the connected simulated current transformer under test is the simulated current transformer under test based on the voltage value sampled by AD sampling port 1. Different standard simulated current transformers have different turns ratios, and the resistance Rm of different standard simulated current transformers has different values. When performing wiring status testing on a standard simulated current transformer, the MCU chip of the simulated transformer calibrator determines whether the connected standard simulated current transformer is the standard simulated current transformer to be tested based on the voltage value sampled by AD sampling port 2.

8. A current transformer calibration simulation training device according to claim 6 or 7, characterized in that: The voltage divider circuit under test includes a power supply, resistor R1 and resistor R2 connected in sequence. The connection point between resistor R1 and resistor R2 is the output of the voltage divider circuit under test. The parallel circuit under test is connected in series between resistor R1 and the output of the voltage divider circuit under test or in series between the power supply and resistor R1. The output of the voltage divider circuit under test is connected to the AD sampling port 1 of the simulation transformer calibrator through resistor R3. The standard sampling voltage divider circuit includes a power supply, resistor R4 and resistor R5 connected in sequence. The connection point between resistor R4 and resistor R5 is the output of the standard sampling voltage divider circuit. The standard parallel circuit is connected in series between resistor R4 and the output of the standard sampling voltage divider circuit or in series between the power supply and resistor R4. The output of the standard sampling voltage divider circuit is connected to the AD sampling port 2 of the simulation transformer calibrator through resistor R6. Preset value I = 5 * R2 / (R1 + Rn + R2), unit is volt; Preset value II = (5 - UDn) * R2 / (R1 + R2), unit is volt; Preset value III = 0, unit is volt; Preset value IV = 5 * R5 / (R4 + Rm + R5), unit is volt; Preset value V = (5 - UDm) * R5 / (R4 + R5), unit is volt.

9. A current transformer calibration simulation training device according to claim 6 or 7, characterized in that: The voltage divider circuit under test includes a power supply, resistor R1 and resistor R2 connected in sequence. The connection point between resistor R1 and resistor R2 is the output of the voltage divider circuit under test. The parallel circuit under test is connected in series between the output of the voltage divider circuit under test and resistor R2 or in series between resistor R2 and ground. The output of the voltage divider circuit under test is connected to the AD sampling port 1 of the simulation transformer calibrator through resistor R3. The standard sampling voltage divider circuit includes a power supply, resistor R4 and resistor R5 connected in sequence. The connection point between resistor R4 and resistor R5 is the output of the standard sampling voltage divider circuit. The standard parallel circuit is connected in series between the output of the standard sampling voltage divider circuit and resistor R5 or in series between resistor R5 and ground. The output of the standard sampling voltage divider circuit is connected to the AD sampling port 2 of the simulation transformer calibrator through resistor R6. Preset value I = 5 * (Rn + R2) / (R1 + Rn + R2), unit is volt; Preset value II = (5 - UDn) * R2 / (R1 + R2), unit is volt; Preset value III = 0, unit is volt; Preset value IV = 5 * (Rm + R5) / (R4 + Rm + R5), unit is volt; Preset value V = (5 - UDm) * R5 / (R4 + R5), unit is volt.

10. A current transformer calibration simulation training system, comprising a current transformer calibration simulation training device and a student PC, wherein the current transformer calibration simulation training device is the current transformer calibration simulation training device according to any one of claims 4-8, and the simulated current transformer load box of the current transformer calibration simulation training device communicates with the student PC via ZIGBEE to receive and display the load value range of the simulated current transformer under test set by the student PC, and to upload the manually changed load value range to the student PC; The current transformer calibration simulation training device uses ZIGBEE communication between the simulated current transformer calibrator and the trainee's PC to receive and display the calibration parameters and error parameters sent by the trainee's PC. The trainee's PC is connected to the operation auxiliary console via ZIGBEE communication, which is used to output selection commands to the control verification station switching module to realize the switching of the verification station of the simulated current transformer under test.

Images