Product introduction:

 

 

 

In the various fields of national economy, such as power, large factories and mines and public facilities, equipment and buildings in the operation and use must be through large grounding device has a good grounding, in order to ensure that all sorts of equipment and buildings safe operation and personnel safety, electrical equipment and reliable grounding is the important guarantee of reliable operation substation equipment.

 

 

 

For large grounding systems. With large area and complex structure, there is no safe, convenient and accurate method to measure the comprehensive parameters of grounding device. The traditional method is only to measure the grounding resistance of the grounding network, as long as the grounding resistance value meets the requirements, the grounding network is considered qualified, which is actually very incomplete. The overall evaluation of the grounding grid shall include the grounding resistance of the grounding grid, the grounding resistance of each device, the step voltage, the contact voltage, and the distribution voltage of the grounding grid. Based on this consideration, we developed this set of large-scale integrated parameter measurement system for the ground network, which can facilitate and comprehensively help us to evaluate the overall situation of the ground network.

 

 

 

The measurement system of the large grounding device of fet-5s power plant and substation independently developed and produced by our company adopts the test method of different power frequency (40HZ -- 60HZ) and current (1 ~ 20A) to conduct comprehensive safety assessment on the ground network. The system is the grounding network impedance, contact voltage, distribution voltage, step voltage measurement of voltage, current measurement, using the latest digital frequency selection technology, filtering interference signals, so that the measurement data accurate and reliable.

 

 

 

Functional description:

 

 

 

I. instrument features:

 

 

 

1. Measurement can be carried out under the condition of no power failure of the equipment

 

 

 

2. Frequency conversion technology avoids power frequency interference of the main power grid

 

 

 

3, different frequency small current (0 ~ 20A) measurement, high safety

 

 

 

4. The injection current frequency (40Hz -- 60Hz) is adjustable

 

 

 

5. High-power coupling transformer ensures isolation and maximum current output

 

 

 

6. Digital voltmeter with ac frequency modulation adopts digital bandpass filter with calibration device to ensure convenient and accurate measurement

 

 

 

7. High stability frequency signal source ensures the accuracy of the whole test process

 

 

 

8, repeatable measurement, improve the accuracy of measurement

 

 

 

9, save time, money (compared with the large current test can save more than 50%)

 

 

 

Ii. Function description

 

 

 

1. Measurement of grounding resistance of ground network

 

 

 

2. Measurement of distributed potential

 

 

 

3. Contact voltage measurement

 

 

 

Step voltage measurement

 

 

 

5. Soil resistivity measurement

 

 

 

Iii. System composition

 

 

 

1. High-power signal generator

 

 

 

2. Power supply coupler

 

 

 

3. Adjustable frequency digital voltmeter

 

 

 

4. Power control box

 

 

 

5. Accessory box: measuring electrode, measuring wire, wire coil and wire release frame

 

 

 

 

 

 

 

Technical parameters:

 

 

 

System technical parameters:

 

 

 

1. High-power signal generator:

 

 

 

Measuring range:

 

 

 

Electric power equipment grounding network resistance and impedance of 0 ~ 20 Ω

 

 

 

Current pole resistance Ω 0 ~ 1000

 

 

 

Soil resistivity 0 ~ 9999 Ω m.

 

 

 

Input voltage: 220V 10%

 

 

 

Output voltage: 0 ~ 800V (customized)

 

 

 

Output current: 0 ~ 20A (customized)

 

 

 

Output frequency: single frequency measurement: 40 ~ 60HZ step 1HZ is a frequency point

 

 

 

Automatic dual frequency conversion measurement: 40/60hz, 41/59hz, 42/58hz, 43/57hz, 44/56hz,

 

 

 

45/55hz, 46/54hz, 47/53hz, 48/52hz

 

 

 

Frequency stability: < 180ppm

 

 

 

Measuring accuracy: 0 ~ 20 Ω 2% + / - 0.02 Ω resolution: 0.001 Ω

 

 

 

2 ~ 20 Ω 2% + / - 0.2 Ω resolution: 0.001 Ω

 

 

 

Environmental temperature measurement: - 50 ℃ ~ 99 ℃

 

 

 

Measurement: automatic measurement

 

 

 

Display mode: 7 "true color LCD display

 

 

 

Printing method: thermal printing

 

 

 

Measurement conditions: (1) power failure measurement

 

 

 

(2) environmental temperature: - 20 ℃ ~ 60 ℃

 

 

 

Relative humidity: not more than 85%

 

 

 

Weight: 5 kg

 

 

 

2. Power supply coupler:

 

 

 

Input voltage: 220V 50/60hz 25A

 

 

 

Output voltage: 0 ~ 800V

 

 

 

Output current: 0 ~ 20A (customized)

 

 

 

Weight: 35 kg

 

 

 

3. Digital frequency selective voltmeter:

 

 

 

Voltage range: 200mv/2V/20V/200V (automatic range switching)

 

 

 

Frequency range: 40Hz - 60Hz

 

 

 

Frequency stride: 1Hz

 

 

 

Linear error: < 2%

 

 

 

Typical noise attenuation: +/ -1hz (25dB) +/ -2hz (60dB)

 

 

 

Power supply: built-in 2000mAH rechargeable lithium battery

 

 

 

Weight: 2 kg

 

 

 

4. Power control box:

 

 

 

220 v / 50 hz 10 a

 

 

 

Weight: 0.5 KG