CTPT comprehensive tester

The main function of LYFA3300CTPT comprehensive tester is to complete the control of variable frequency power supply and data acquisition during the testing process. All data analysis, storage, and interface display are completed by the industrial computer system. The industrial computer is equipped with an embedded XPE system and self recovery protection for the system's C drive, which can effectively avoid software system failures and virus attacks. Internal storage space of the instrument; amp; 6G, Z large storage data amp; 1000 sets.

　　LYFA3300CTPT comprehensive testerScope of use and technical specifications

1.1 Function and usage scenarios

The following tests are used for current transformers:

1) Excitation characteristic test

2) Turn ratio detection

3) Comparison and angle difference verification

4) Polarity verification

5) Measurement of secondary winding resistance

6) Secondary load measurement

7) 5% and 10% error curve measurement

8) CT transient characteristic testing and analysis

9) CT nameplate automatic inference

10) Measurement of CT parameters such as inflection point voltage/current, accuracy limit factor, instrument security factor, secondary time constant, remanence coefficient, accuracy level, saturation and unsaturation, inductance, inflection point electromotive force, ultimate electromotive force, and area coefficient

11) Measurement of hysteresis loop of current transformer core

It can also be used for the following tests of voltage transformers:

1) PT turns ratio detection

2) PT polarity verification

3) Measurement of PT secondary winding resistance

4) PT secondary load measurement

5) Measurement of PT excitation characteristics

The main application scenarios of the device are:

1) Parameter verification of CT nameplate

2) Parameter verification when CT is connected to the current load

3) Analyze the transient characteristics of CT and its impact on relay protection devices.

4) Calibration of PT nameplate parameters

5) PT secondary load verification

1.2 Technical specifications of CTPT analyzer

1. Test standard basis:

IEC60044-1, IEC60044-2, IEC60044-5, IEC60044-6, GB1207, GB1208,GB16847, GBT4703, C57.13

2 Input power supply voltage: AC220V ± 10%, 50Hz/60Hz ± 10%

3 Output voltage: 0.1~180V (AC)

4 Output current: 0.001~5A (RMS)

5 output power: 500VA

6 High Equivalent Turning Point Voltage: 45KV

7 Current Measurement: Range: 0~10A (Automatic Range: 0.1/0.4/2/10A)

Error<± 0.1%+0.01% FS

8 Voltage measurement: Range: 0~200 V (automatic range 1/10/70/200V)

Error<± 0.1%+0.01% FS

9-turn ratio measurement: range: 1~35000,

1-2000 error<0.05%

2000~5000 error<0.1%

5000~35000 error<0.2%

10 phase measurement: accuracy: ± 2min, resolution: 0.01min

11. Measurement range of secondary winding resistance: 0~8K Ω (automatic range 2/20/80 Ω/800 Ω/8k Ω)

Error<0.2% RDG+0.02% FS, high resolution: 0.1m Ω

12 Temperature measurement: -50~100 degrees, error<3 degrees

13 CT secondary load measurement: 0-160 ohm (2/20/80 ohm/160 ohm)

*. 2% RDG+0.02% FS high resolution 0.001ohm

14 PT secondary load measurement: 0-80kohm (800ohm/8kohm/80kohm)

*0.2% RDG+0.02% FS high resolution 0.1 ohm

15 PT turns ratio measurement: range: 1~30000,

1~5000 error<0.2%

5000~30000 error<0.5%

16 can automatically evaluate the test results according to the selected standards and determine whether the transformer is qualified

17 can simultaneously detect the ratio difference and angle difference of current mutual inductance under rated load and operating load

18 has the function of automatically generating WORD test reports

19 has the function of batch production of WORD test reports, which can produce all selected test files into standardized WORD reports at once

20 can automatically compare the excitation curve with the stored historical curve

21 data storage groups: greater than 1000 groups

22 Working conditions: temperature: -10 ℃~50 ℃, humidity: ≤ 90%

23 Dimensions: 485mm × 356mm × 183mm

24 weight: 15Kg

　　CTPT comprehensive testerHardware device

2.2 Power Connection

The power input socket is located on the right side of the instrument panel, as shown in Figure 2.2. The power input range is AC220 ± 10%, 50/60Hz ± 10%, and the power socket is equipped with a 5A fuse inside.

2.3 Input and Output

There are three sets of test interfaces: power output, CT secondary side/PT primary side input, CT primary side/PT secondary side input.

Power output terminal: power output interface, output voltage range is AC 0~180V, output current is AC 0~5A

CT secondary/PT primary input terminals:

CT secondary winding/PT primary winding voltage measurement input interface, the voltage range of the input signal is AC0-180V

CT primary/PT secondary input terminals: CT primary/PT secondary winding voltage measurement input interface, input signal voltage range is AC0-5V

2.4 Hardware Principle Block Diagram

The structural principle is shown in Figure 2.3, where the constant voltage and constant current variable frequency power supply module is isolated from the AC220V power input. By using a DSP data acquisition system to control the constant voltage and current module, the power supply can output AC 0~180V sine voltage signals or AC 0~1A sine current signals.

The main function of the DSP data acquisition system is to complete the data acquisition for the control and testing process of the variable frequency power supply. All data analysis, storage, and interface display are completed by the industrial computer system. The industrial computer is equipped with an embedded XPE system and self recovery protection for the system's C drive, which can effectively avoid software system failures and virus attacks. The internal storage space of the instrument is greater than 6G, and the large storage data is greater than 1000 sets.

2.5 Keyboard

The panel is equipped with a 16 key keypad for data input, as shown in Figure 2.4. The definition of each key is as follows:

1) 0-9 numeric input keys

2) ∧ Select up arrow key

3) ∨ Select the directional key downwards

4) Delete data key

5). Decimal point input key

6) ESC Deselect Key

7) Confirm selection or input key