At present, the conventional QJ44 double-arm DC bridge is generally used in the power system for measuring contact resistance, and the test current of this kind of bridge is only mA level, so it is difficult to find the defect of reducing the cross-sectional area of the loop conductor. When measuring the contact resistance of the conductive loop of high-voltage switch, due to the influence of oil film and oxide layer between contacts, the measured value is several times larger and cannot truly reflect the contact resistance value. To this end, the Ministry of Electric Power's standard SD301-88 "AC 500KV Power Equipment Handover and Preventive Test Procedures" and the new version of "Power Equipment Preventive Test Procedures" stipulate that the measured current of contact resistance of circuit breakers and isolating switches shall not be less than DC 100A to ensure accurate test results.

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Key words:

resistance

power

current

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400-068-3818

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Product Description
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ACCESSORIES LIST

- Commodity name: ZEHL-100A loop resistance tester
At present, the conventional QJ44 double-arm DC bridge is generally used in the power system for measuring contact resistance, and the test current of this kind of bridge is only mA level, so it is difficult to find the defect of reducing the cross-sectional area of the loop conductor. When measuring the contact resistance of the conductive loop of high-voltage switch, due to the influence of oil film and oxide layer between contacts, the measured value is several times larger and cannot truly reflect the contact resistance value. To this end, the Ministry of Electric Power's standard SD301-88 "AC 500KV Power Equipment Handover and Preventive Test Procedures" and the new version of "Power Equipment Preventive Test Procedures" stipulate that the measured current of contact resistance of circuit breakers and isolating switches shall not be less than DC 100A to ensure accurate test results.

1. Product Overview：

At present, the conventional QJ44 double-arm DC bridge is generally used in the power system for measuring contact resistance, and the test current of this kind of bridge is only mA level, so it is difficult to find the defect of reducing the cross-sectional area of the loop conductor. When measuring the contact resistance of the conductive loop of high-voltage switch, due to the influence of oil film and oxide layer between contacts, the measured value is several times larger and cannot truly reflect the contact resistance value. To this end, the Ministry of Electric Power's standard SD301-88 "AC 500KV Power Equipment Handover and Preventive Test Procedures" and the new version of "Power Equipment Preventive Test Procedures" stipulate that the measured current of contact resistance of circuit breakers and isolating switches shall not be less than DC 100A to ensure accurate test results.

This product is based on the latest the People's Republic of China power implementation standard DL/T845.4-2019, using high-frequency switching power supply technology and digital circuit technology combined design. It is suitable for the measurement of circuit resistance of switch control equipment. The test current adopts the DC 100A recommended by the national standard. The loop resistance can be measured directly at a current of 100A and displayed digitally. The instrument is accurate in measurement, stable in performance, and meets the requirements of on-site high-voltage switch maintenance and high-voltage switch factory circuit resistance testing in power and power supply departments.

II Use：

This product is suitable for high-precision measurement of high-voltage switch contact resistance (loop resistance), and is also suitable for other occasions that require high current and micro-resistance measurement.

　　

3. performance characteristics

(1) large current: using the latest power supply technology, can continuously output large current for a long time, overcome the shortcomings of the pulse power supply instantaneous current, can effectively break down the switch contact oxide film, get good test results.

(2) Strong anti-interference ability: Under severe interference conditions, the last bit of data on the LCD screen can be stabilized within ± 1 word range, with stable readings and good repeatability.

(3) Long service life: All high-precision resistors are used to effectively eliminate the influence of ambient temperature on the measurement results. At the same time, the use of military connectors enhances the anti-vibration performance.

(4) easy to carry: small size, light weight.
2.Technical parameters:

1. Measurement range: 1 ~ 1999μΩ

2. Resolution: 1μΩ

3. Test current: DC 100A

4. Measurement accuracy: 0.5%± 1d

5. Display mode: current: three-and-a-half digital tube; resistance: three-and-a-half digital tube

6. Working power supply: AC220V ± 10PHz

7. Working environment: temperature -10 ℃ ~ 40 ℃ humidity: ≤ 80% RH

8. Volume: 390 × 300 × 150 mm³

9. Weight: 6Kg (excluding accessories)
Attachment Download:ZEHL-100A loop resistance testerUser Manual. doc.
Packing List

1. Host 1

2. One set of special test lines (two high current lines 6m, two high current test clips and two voltage test lines 6m)

3.1 grounding wire

4, 8A insurance tube 3

5.1 accessory package

6.1 AC 220V power cord

7. Instruction 1

8. One copy of factory inspection report

9. One certificate

Quality first, service first

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Cooperation cases

Wuhan Zhongke Xinyi Electric Power Technology Co., Ltd.

Brand: ZECERS/Zhongke Xinyi

Wuhan Zhongke Xinyi Electric Power Technology Co., Ltd. (brand: ZECERS/Zhongke Xinyi) is a high-tech enterprise focusing on the design, development, manufacturing and technical services of high-voltage test equipment and secondary test equipment for power systems.

The company is located in the Optics Valley New District of the High-tech Development Zone, with 5600 square meters of modern standard production plants and perfect manufacturing, processing and testing equipment. The company has a strong research and development, solid technology, excellent quality team, and Wuhan universities have close ties and technical cooperation, laying a solid foundation for technological innovation. The company has successively obtained ISO9001:2015 international quality management system certification and high-tech enterprise certification. Based on domestic power system testing, the company explores high-tech cutting-edge information technology, and is committed to the research of various new power technologies and the formulation and promotion of relevant standardization.

The company adheres to the business philosophy of "quality-oriented, pioneering and innovative, honest and pragmatic, and win-win cooperation", regards product quality and independent innovation as the core competitiveness of the enterprise, and continuously strives for the standardization, humanization, intelligence, refinement and diversification of products. The products cover all aspects of power testing, and widely serve the State Grid, South Grid, Inner Mongolia Power Grid and other power systems, major power generation groups, photovoltaic wind power new energy enterprises, railway petrochemical enterprises, metallurgical industrial and mining enterprises, electrical complete sets of enterprises, transmission, transformation and distribution engineering construction units, scientific research institutions, third-party testing institutions and other enterprises and institutions. The power testing equipment produced by the company provides a reliable data basis for the safe operation of the power system. The company's products have covered all provinces and cities in the country, and have been exported to Laos, Myanmar, Cambodia, Vietnam, Pakistan, East Africa, Russia, Malaysia, Brazil, Europe and other countries, and have been widely recognized.

"Technology to create the future, innovation to change the present", would like our professional to provide you with satisfactory products and services and create more value.

2014 Year

Company establishment

3060 Wan yuan

Registered capital

5600 ㎡

Production plant

8372 +

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