ET-802 Microcomputer Protection Relay Test Set

 

This product makes full use of modern advanced microelectronic technology and devices to realize a new miniaturized microcomputer relay protection tester. The microcomputer relay protection tester operates independently by a single computer and can also be connected with the advanced structure of a notebook computer. The host adopts DSP + FPGA structure true 16-bit DAC output built-in modular high-fidelity linear high-power amplifier. Windows XP operation system is powerful. Small volume and high accuracy. The microprocessor relay protection tester not only has the superior performance and advanced function of large-scale tester but also has the advantages of small-scale tester such as compact and flexible easy operation high reliability and high performance-price ratio. It is a good tool for security workers.

 

Product characteristics

1. High-Performance Industrial Control Computer

High performance Industrial control computer is adopted as the controlling computer through which you can run the windows operating system directly. 8.5"TFT true color LCD display tracking ball and optimized keyboard are located on the faceplate of this tester which can be used without the external mouse and keyboard. USB interface 10-100M net mouth and serial communication interface are located on the back plate of this tester through which you can access data communicate data and upgrade software conveniently.

The whole process and the result of the test will all be showed on the LCD. The Chinese operational interface of the complete set is very friendly and convenient. The tracking ball and keyboard on the faceplate will implement the operation. The operation is simple and convenient and is easy to be mastered. Operator only needs a little knowledge of computer.

Keyboard and mouse interface are also located on the faceplate. If you would like to use the external mouse and keyboard through pluging them with corresponding interfaces you can operate this tester just like operating a desk-top computer.

 

2. Digital Signal Processor Microcomputer

High-speed digital controlling processor is adopted as the output core of the tester. 32 bit double precision arithmetic is employed in the software through which arbitrary high-accuracy waveforms of each phase can be produced. Since integrative structure is adoptedthe structure of the tester is layed compactly.The distance of data transmission is short with tight structure which overcomes the problem of fewer points of waveform output due to long data communicational line and narrow frequency band when using the test controller controlled directly by PC.

 

3. D/A Conversion and Low-Pass Filtering

High precision D/A converter is employed for ensuring the precision and linearity of current and voltage in the whole range.

Due to high density of fitting ponit fidelity of waveform is high and harmonic component is small which doesn’t have a strict requirement on the low-pass filter. Consequently it has good characteristics of transient phase frequency and amplitude frequency which is easy to perform accurate phase-shifting and harmonic superposition and ensures very high precision even when the frequency is high.

  

4. Voltage and Current Amplifier

For phase current and voltage we persist in adopting high performance linear amplifier output mode in order to make the current and voltage source to directly output all kinds of waveforms from the DC waveform to the waveforms including all kinds of frequency components such as square wave combined waveform overlapped by each order harmonic fault transient waveform etc. In addition the output waveform is clear and smooth without high-frequency radiated interference with neighboring equipments. It can simulate well all kinds of current and voltage characteristics under the circumstance of short circuit fault.

For power amplifier circuit we adopt import power parts with high-power and hi-fi module style as power output combining with heat dissipation structure layed elaborately and reasonably it has enough large power redundancy and thermal capacity. The power amplifier circuit has overheat overflow overvoltage and short circuit protections. When overflow occurs in the current circuit and overload or short circuit occurs in the voltage circuit it will limit the output power automatically switch off the whole power amplifier circuit and give alarm signal.In order to prevent the overheat of the power amplifier for long time operating under large current a software time terminating system under large current is set in this tester. It can work for a long period when outputting is 10A or below. When the current is over 10A the tester will start up the software time termination order. When time is up the software will forbid power output automatically and give alarm signal. The higher output current is the shorter the limiting time will be.

5. Digital Input and output

This tester has 10 channels digital input and 8 channels output.

 

Technique parameters

AC current output

Phase current output (effective value) 0~40A, Output Precision 0.2 degree

3 phase parallel current output (effective value) 0~120A

A Long-time Phase current 10A

Maximum output power of Phase current 450VA

Maximum output power of 3 parallel current 900VA

Maximum Permitted work time of 3 parallel current 10S

Frequency range ( fundamental) 0~1000Hz

Harmonic time 0~20

DC current output

Current output 0～±10A / phase, 0～±30A / 3 parallel

Output Precision 0.5 degree

AC voltage output

Phase voltage output (effective value) 0~120V Output Precision 0.2 degree

Line voltage output (effective value) 0~240V

Phase voltage / Line phase output power 80VA / 100VA

Frequency range (fundamental) 0~1000Hz

Harmonic time 0~20

DC voltage output

Phase voltage output range 0～±160V Output Precision 0.5 degree

Line voltage output range 0～±320V

Phase voltage / Line phase output power 70VA / 140VA

10 path digital input and 8 path digital output

Time measuring range 0.1ms ～ 9999s ，accuracy of measurement ＜0.1ms

Size & weight 400×360×160mm³ ，15kg

 

No.	Name	Type	QTY
1	Host	/	1
2	Power cord	/	1
3	Testing line	/	1
4	Thermal printing paper	/	1
5	Accessory case	/	1
6	Fuse	/	2
7	Inspection report	/	1
8	Instruction manual	/	1
9	Certificate	/	1
10	Warranty card	/	1

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