Online Testing Instrument for Secondary Measurement Circuits

Chapter    Summary

EDDL-HThe proper operation of the Type计量 secondary circuit online tester is crucial for the accuracy of electrical energy measurement. It primarily includes current transformers, voltage transformers secondary circuits, energy meters, and load monitoring units. Affected by different operating environments, potential fault risks may arise in the secondary circuit after a period of operation. If not detected and addressed promptly, these issues could lead to accidents. There are various types of faults that can occur in the secondary circuit, mainly including poor grounding, shunting, contact damage, and transformer inter-turn insulation breakdown. These faults typically manifest as changes in circuit admittance (or impedance). Therefore, testing the circuit admittance is a convenient and effective method for fault analysis, allowing for the avoidance of盲目 searching for faults, difficulties in power outage maintenance, or the inability to detect faults post-power outage, among other practical issues.

Excessive comprehensive error in electrical energy measurement is another critical issue commonly encountered in the field. The comprehensive error in electrical energy measurement consists of measurement errors caused by the composite error of voltage transformers, the composite error of current transformers, the error of electrical meters, and the measurement error due to voltage drop in the secondary winding of voltage transformers. Among these, the impact of secondary load on transformer error is significant.

In the "On-Site Inspection Guidelines for Electric Energy Metering Equipment," clear requirements are also set forth for the actual load measurement of the secondary circuit of transformers. In reality, the actual secondary load of transformers has a significant impact on their accuracy.

Current secondary load test methods on the market predominantly use the voltage-amperage phase method, which has drawbacks such as complicated wiring, the need for power interruption during measurement, and indirect readings.

In response to the aforementioned issues, our company's R&D team leverages the latest technological advancements, integrating withDSPPlatform technology has developed and produced high

A performance-to-price ratio计量二次回路导纳在线测试仪 with technology levels reaching international advanced standards.

Two  Key Features

This instrument features the following:Untranslated: 独.There isThe functionality.

1.Molded plastic enclosures ensure safety for test personnel and systems.

2.The measurement data automatically switches ranges based on the magnitude of the error.

3.Adopting electronic principle circuitryDSPTechnology ensures excellent test stability and strong anti-interference capability.

4.Utilizing large-screen LCD displays with Chinese characters, all operations are prompted by Chinese menu instructions.

5.Data (including measurement results, serial numbers, testers, test times, power factors, etc.) features power-off storage and browsing capabilities, and can be connected to a computer for data transfer.

6.Battery-powered with no impact on the test circuit, preventing system protection issues. Additionally, operable in the absence of on-site power supply.

7.The secondary load test utilizes clamp meter current sampling without the need to disconnect the secondary circuit. It features automatic range switching, allowing for adjustments to different positions based on the test object's values during measurement, ensuring both measurement accuracy and display precision.

8.Isolation methods are used during the secondary admittance test, which will not affect the secondary circuit.