Product Details

Main Functions:

Used to test the DC resistance of switch contacts, circuit breaker contacts, busbars, contacts, SF6 switches, various connections, fuses, and railway connections. Working Principle: The M400 uses a silicon-controlled rectifier circuit to adjust the test current to a preset value. This current is rectified and filtered before being applied to the sample under test, directly measuring the resistance value. In this current, voltage is applied to the unknown circuit under test and a known resistance circuit for comparison, and the reading is displayed on a digital ammeter. The test principle adopts a four-terminal measurement method, where four-terminal connections are used for the unknown resistance under test and its parallel circuit. The test circuit and its selection switch determine the test range.

2. The operator of the instrument should have general electrical knowledge.

3. The instrument should be used away from places with rain, corrosive gases, excessive dust, high temperature, direct sunlight, etc.

4. The instrument should avoid severe vibration.

5. After testing, be sure to wait until the discharge alarm sound stops before turning off the power and removing the test leads.

6. When measuring no-load tap-changing transformers, be sure to wait until the discharge indication alarm sound stops before switching gears.

7. During the test, it is forbidden to move the test clamps and the power supply lines.

Introduction:

(1) Data processing adopts automatic storage and microcomputer printing. All test data is filled into the corresponding tables in real-time, avoiding manual transcription and ensuring the authenticity and reliability of the data.

(2) The voltage-current ratio can be set, and the measured value is directly displayed;

(3) The test bench uses an Access database to save raw data, conveniently storing all parameters of the tested equipment, test data, ambient temperature, test date, and other information together, forming equipment files for future query and analysis.

(4) Can measure power in low power factor ranges;

(5) Strong anti-interference, with overload alarm indication, line connection error protection, overvoltage, overcurrent protection, and other functions.



Precautions:

1. For no-load tap-changing windings, it is not allowed to switch the no-load tap changer during the test or before the discharge is complete.

2. For inductive test objects, do not remove the test leads before the discharge is complete (when the buzzer is sounding) to avoid electric shock.

3. If the external AC220V power suddenly fails during the test, the instrument will start automatic discharge. At this time, it is not allowed to remove the test leads immediately; wait 5 minutes before removing them.

Technical Specifications:

1. Output current: 5A, 10A

2. Measurement range: 5A: 1mΩ～4Ω　10A: 1mΩ～1Ω

3. Resolution: 1μΩ

4. Test accuracy: 0.2 class

5. Working temperature: -10℃～50℃

6. Working humidity: 0～80%

7. Working power: AC 220V±10% 50Hz±1Hz

Software Introduction:

1. The software installation conditions can work normally under Windows 98, Windows 2000, Windows XP, and other software;

2. Basic functions of the software:

① The transformer comprehensive test bench software can operate and control the transformer ratio tester, transformer winding DC resistance tester, and transformer characteristic tester;

② The transformer comprehensive test bench software can query by test number, capacity, and test date;



Specific Requirements:

① The software has a friendly human-machine interface and is intuitive and simple to operate;

② The software can automatically receive downloaded data or manually input data.

★ Voltage/current transformer control cabinet (optional);

★ Power control cabinet (optional);

★ System auxiliary cabinet (optional);

★ Transformer no-load and load characteristic tester (power analyzer);

★ Transformer DC resistance tester;

★ Transformer ratio and group tester;

★ High-voltage test transformer;

★ Medium-frequency generator set;

★ Induction voltage regulator;

★ Temperature patrol instrument;

★ Temperature sensor;

★ Partial discharge detection system (optional);

★ PLC controller;　

★ Industrial computer and dedicated software;　

★ Video surveillance system.

Main Technical Specifications:

★ Measurement range: 0～2000Ω. (Six ranges in total)

★ Test current: 5A (20mΩ～2Ω); 0.5A (20Ω); 0.05A (200Ω); 0.005A (2000Ω).

★ Resolution: 1μΩ (20mΩ range); 10μΩ (200mΩ range); 0.1mΩ (2Ω range); 1mΩ (20Ω range); 10mΩ (200Ω range); 0.1Ω (2000Ω range).　

★ Accuracy: 1mΩ～2000Ω (±0.5%)

★ Total power consumption: ≤100W

★ Working temperature and humidity: 0℃～40℃; ≤85% RH

★ Withstand voltage: AC1.5kV 50HZ 1min

★ Working power: AC220V 50 HZ (±10%)

★ Dimensions: 350mm(L)×260mm(W)×140mm(D)

★ Weight: approx. 120kg

Note: The above information and technical parameters are compiled and released by Yangzhou Darui Electric Co., Ltd.