HZDK-1000 DC Switch Ampere-Second Characteristic Tester-Huazheng Electric Manufacturing (Baoding) Co., Ltd

Overview

At present, the DC feeder network of the substation mostly adopts a tree structure. From the battery to the power equipment in the station, it generally goes through three levels of power distribution, and each level of power distribution mostly uses DC circuit breakers as protective devices. Due to the mismatch of the protection action characteristics of the upper and lower DC circuit breakers, when a short circuit occurs in the lower power equipment during the operation of the DC system, it often causes the DC circuit breaker of the upper level to trip, thereby causing power outages in other feeder lines, and then causing accidents in the primary equipment of the substation such as high-voltage switches, transformers, capacitors, etc. In order to prevent the hidden dangers caused by the mismatch of the action characteristics of DC circuit breakers and other DC protective devices, the State Grid Corporation of China has stipulated that the ampere-second characteristic test must be carried out for newly installed and operating DC protective devices to ensure that the performance is consistent with the design, so as to ensure the correctness of the DC circuit differential coordination. Article 12, Paragraph 8 of the "DC Power System Operation Specifications" issued in 2005 stipulates that "DC fuses and air circuit breakers should be of qualified quality, and their fuses or settings should be graded and adjusted in accordance with relevant regulations, and checked regularly to prevent accidents from expanding due to incorrect operation"; Article 27 of the "DC Power System Technical Supervision Regulations" stipulates: "... automatic air circuit breakers should be subject to spot checks on characteristics and operating currents before use...."; Article 11 of the "Measures for Preventing Accidents in DC Power Systems" stipulates: "... spot checks on ampere-second characteristics and operating currents should be conducted before use..."

The ampere-second characteristics of DC protection devices are generally tested in national laboratories or testing stations. The equipment occupies a large area and requires a special charging device and a high-current load box, which is complicated to operate. Some operating units use substation battery packs to test the differential coordination of DC protection devices, but cannot accurately test their current-action time characteristics. As a result, after the DC system is put into operation, on-site maintenance personnel cannot verify whether the ampere-second characteristics of DC protection devices meet the requirements because they do not have the corresponding testing methods and tools.

According to the actual situation of the ampere-second characteristic test of DC protection devices, our company has launched a DC circuit breaker ampere-second characteristic test system that is suitable for on-site use in substations, easy to carry, and highly automated. It can provide the operation and maintenance department with a means of testing the action characteristics of DC protection devices, and calibrate the action characteristics and differential coordination of DC protection devices, so as to improve the reliability of DC system operation and ensure the safe and reliable operation of the power grid.

Product Feature

1. The instrument can be used alone or connected to a PC

2.7-inch LCD display, high-speed thermal printer, intelligent working process

3. Power electronic control technology is used to generate large current output, the output current has fast response speed, high precision, and continuous adjustment

4. Multiple high-precision sensors automatically switch current range and high-performance 14-bit AD acquisition chip

5. With power-off storage function, 200 sets of test data can be stored

6. Automatically save the setting data, and display the last setting data after power-off and restart

Technical Data

1. Power input: 220V±10%, frequency: 50Hz±0.5 Hz;

2. Test current range: 0-1000A;

3. Test current ripple coefficient: less than 5%;

4. Output current stability: ≤0.5%;

5. Time record: 0-999999S;

Transportation And Storage

Transportation

When the equipment needs to be transported, it is recommended to use our company's instrument packaging wooden boxes and shock-absorbing items to avoid unnecessary damage during transportation and cause unnecessary losses to you.

When the equipment is not in wooden boxes during transportation, stacking is not allowed. When using our company's instrument packaging boxes, the maximum number of stacking layers allowed is two layers.

During the transportation of the equipment, the instrument panel should face up.

Storage

The equipment should be placed in a dry, dust-free, ventilated and non-corrosive gas room. Stacking is not allowed without wooden box packaging.

When the equipment is stored, the panel should face up. And moisture-proof items are placed at the bottom of the equipment to prevent the equipment from getting wet.

Packing List