MHW-HII microcomputer relay protection tester

1、 Product Introduction:

1. The device adopts a high-speed digital control processor as the output core, and applies a 32-bit dual precision algorithm in the software to generate high-precision waveforms of any phase. Due to the use of an integrated structure, the various parts are tightly combined, the data transmission distance is short, and the structure is compact. Overcoming the problem of fewer output waveform points caused by long data communication lines and narrow frequency bands in laptop controlled measurement and control instruments.
2. We have always insisted on using high-performance linear amplifiers for phase current and voltage output, so that the current and voltage sources can directly output waveforms from DC to various frequency components, such as square waves, combined waveforms of various harmonics, fault transient waveforms, etc. The output waveforms are clean and smooth, without high-frequency radiation interference to adjacent equipment, and can simulate the current and voltage characteristics of various short-circuit faults well.
3. The power amplifier circuit adopts imported high-power high fidelity modular power devices as the power output stage, combined with carefully and reasonably designed heat dissipation structure, with sufficient power redundancy and thermal capacity. The power amplifier circuit has complete protection against overheating, overcurrent, overvoltage, and short circuit. When overcurrent occurs in the current circuit, overload or short circuit occurs in the voltage circuit, the output power is automatically limited, the entire power amplifier circuit is turned off, and an alarm signal is displayed. To prevent overheating of the power amplifier circuit caused by long-term operation under high current, the device has set a software time limit for high current. When the output is 10A or below, the device can work for a long time. When the current exceeds 10A, the software will start within a time limit. When the time limit expires, the software will automatically turn off the power output and give an alarm indication. The larger the output current, the shorter the time limit.

2、 Product features:

1. Flexible combination of voltage and current output can achieve 6-phase voltage and 6-phase current, and can be freely combined to achieve conventional 4-phase voltage, 3-phase current type, 6-phase voltage type, 6-phase current type, and 12 phase output modes. It is compatible with various traditional testing methods, and can also be conveniently used for three-phase transformer differential testing, plant power fast switching, and backup automatic switching testing.
2. The operation mode device can also be connected to an external laptop or desktop computer for operation, achieving dual operation mode, convenient, fast, and stable performance.
3. The output end of the new high fidelity linear amplifier has always insisted on using high fidelity and high reliability modular linear amplifiers instead of switch type amplifiers, which have excellent performance. It will not cause high or medium frequency interference on the test site, and ensures smooth waveform accuracy from high current to low current throughout the entire process.
4. The output part of the high-performance host is controlled by DSP, which has fast computing speed, strong real-time digital signal processing capability, wide transmission bandwidth, and controls high-resolution D/A conversion. The output waveform has high accuracy, low distortion, and good linearity. The device adopts a large number of advanced technologies and precision component materials, and has undergone specialized structural design, resulting in small size, light weight, comprehensive functions, easy portability, and can work immediately after startup. Flow testing is very convenient.
5. The software has powerful functions and can complete various large-scale complex verification tasks with high automation levels. It can easily test and scan various protection settings, perform fault playback, store test data in real time, display vector graphics, and print reports online. 6-phase current can facilitate three-phase differential protection testing.
6. It has an independent dedicated DC power output with one 110V and 220V dedicated adjustable DC power output.
7. The complete interface device is equipped with a USB communication port, which can communicate with computers and other external devices.
8. The sound self-protection function has a reasonable heat dissipation structure design, reliable and complete hardware protection measures, power soft start function, software self diagnosis of faults, and output locking function.

3、 Product Technical Parameters:

(1)Rated parameters:

(II)AC current output:
When outputting 6-phase current, each phase outputs (effective value) from 0 to 30A with an output accuracy of 0.2 level
When outputting 3-phase current, each phase outputs (effective value) 0-60A
3. 6-phase parallel current output (effective value) 0-180A
4. Long term allowable operating value (effective value) of phase current 10A
5. Maximum output power of phase current 300VA
6. Maximum output power of 1000VA at maximum output of 6-phase parallel current
7. The maximum allowable working time for 6-phase parallel current output is 10 seconds
8. Frequency range (fundamental) 20-1000Hz
9. Harmonic order 1-20 times
(3)DC current output:
1. Current output 0~± 10A/output accuracy of 0.5 level per phase
2. Maximum output load voltage 20V
(IV)AC voltage output:
1. Phase voltage output (effective value) 0-120V output accuracy of 0.2 level
2. Line voltage output (effective value) 0-240V
3. Phase voltage/line voltage output power 80VA/100VA
4. Frequency range (fundamental) 20-1000Hz
5. Harmonic order 1-20 times
(V)DC voltage output:
1. Phase voltage output amplitude 0~± 160V, output accuracy 0.5 level
2. Line voltage output amplitude 0~± 320V
3. Phase voltage/line voltage output power 70VA/140VA
(VI)Switching quantity:
1. 8-channel switch input
2. Air contact 1-20mA, 24V
3. Potential contact connected to "0": 0~+6V; “1”：+11 V ～ +250 V
4 pairs of switch output DC: 220 V/0.2 A; AC：220 V／0.5 A
(7)Time measurement range:
0.1ms ～ 9999s ， Measurement accuracy ＜ 0.1mS