BS0303B-100 Loop Resistance Tester

BS0303B-100 Loop Resistance Tester

BS0303B-100 Loop Resistance Tester

Product Introduction

At present, the conventional QJ44 double arm DC bridge is commonly used for measuring contact resistance in power systems. However, the testing current of this type of bridge is only in the mA level, making it difficult to detect the defect of reduced cross-sectional area of the circuit conductor. When measuring the contact resistance of high-voltage switch conductive circuits, the measured value is several times larger due to the influence of oil film and oxide layer between the contacts, and cannot truly reflect the contact resistance value; To this end, the Ministry of Electric Power standard SD301-88 "Code for Handover and Preventive Testing of AC 500KV Power Equipment" and the new version of "Code for Preventive Testing of Power Equipment" stipulate that the measured current of contact resistance of circuit breakers and isolating switches shall not be less than 100A DC to ensure accurate test results.

This circuit resistance tester is designed based on the power implementation standard DL/T845.4-2004 of the People's Republic of China, using a combination of high-frequency switching power supply technology and digital circuit technology. It is suitable for measuring the circuit resistance of switch control equipment. The test current adopts the recommended DC 50A and 100A in the national standard, and the circuit resistance can be directly measured at 50A or 100A. The final test results are displayed in numbers; The circuit resistance tester measures accurately and has stable performance, meeting the requirements of on-site high-voltage switch maintenance by power and supply departments and circuit resistance testing by high-voltage switch factories.

Product Features

1. High current: Adopting the latest switching power supply technology, it can continuously output high current for a long time, overcoming the drawbacks of instantaneous current in pulse power supplies. It can effectively penetrate the oxide film of switch contacts and obtain good test results.

2. High stability: Under severe interference conditions, the last digit of the LCD screen can remain stable within ± 1 word range, with stable readings and good repeatability.

3. High precision: Adopting dual channel high-speed 16 bit ∑ - Δ AD sampling and the latest digital signal processing technology, the highest resolution reaches 0.01 μ Ω, making it the only contact resistance tester in China that can achieve 0.01 μ Ω resolution and is very stable. Its performance exceeds that of imported high current micro ohmmeters.

4. Intelligence: Imported high-performance CPU, the system automatically switches the range according to the signal size during measurement to ensure testing accuracy. The over temperature protection circuit can automatically stop outputting current when the instrument exceeds the set temperature, ensuring safe use of the instrument.

5. High quality: All key components are imported, and the cleverly designed temperature compensation circuit effectively eliminates the influence of environmental temperature on measurement results. The use of military connectors enhances the anti vibration performance.

6. Powerful function: The current flow can be freely selected between 50A and 100A, and the testing time can be set arbitrarily within 5s to 599s, overcoming the shortcomings of other similar instruments that cannot set measurement time or have too short continuous working time, far exceeding the performance of other similar instruments.

7. Human computer interface friendly: Rotate the mouse to input data, convenient and fast, set the instrument date and time independently, save measurement data in real time, and print measurement results in real time.

8. USB transfer: Transfer measurement data to a USB drive through a USB interface, and further analyze and process the measurement data in conjunction with the upper computer software.

9. Easy to use: small size, light weight, easy to carry.


Note: Due to continuous product updates, the appearance of the product is subject to the actual product. Technical parameters and models are subject to change without prior notice, and our company reserves the right of interpretation; If there is any act of theft or copying, legal responsibility will be pursued.