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产品简介

NADWG-5A大型地网接地电阻测试仪，可测变电站地网（4Ω）、水火电厂、微波站（10Ω）、避雷针（10Ω）多用机型，采用了新型变频交流电源，并采用了微机处理控制和信号处理等措施，很好的解决了测试过程中的抗干扰问题，简化了试验操作过程，提高了测试结果的精度和准确性，大大降低了试验人员的劳动强度和试验成本。

NADWG-5A大型地网接地电阻测试仪适用于测试各类接地装置的工频接地阻抗、接触电压、跨步电压、等工频特性参数以及土壤电阻率。本仪器采用异频抗干扰技术，能在强干扰环境下准确测得工频50Hz下的数据。测试电流5A，不会引起测试时接地装置的电位过高，同时它还具有极强的抗干扰能力，故可以在不停电的情况下进行测量。

产品别名

地网接地电阻测试仪，大地网接地电阻测试仪，大型地网接地电阻测试仪

产品特性

1、测量的工频等效性好。测试电流波形为正弦波，频率仅与工频相差为5Hz，使用45Hz 和55Hz 两种频率进行测量。

2、抗干扰能力强。本仪器采用异频法测量，配合现代软硬件滤波技术，使得仪器具有很高的抗干扰性能，测试数据稳定可靠。

3、精度高。基本误差仅0.005Ω，可用来测量接地阻抗很小的大型地网。

4、功能强大。可测量电流桩，电压桩的接地电阻，地网的接地电阻，导通电阻,土壤电阻率。

5、操作简单。中英文菜单式操作，直接显示出测量结果。

6、布线劳动量小，无需大电流线。

产品参数

1、阻抗测量范围：0～150Ω

2、分辨率：0.001Ω

3、测量误差：±（读数×2％+0.005Ω）

4、抗工频50Hz 电压干扰能力：10V

5、测试电流波形：正弦波

6、测试电流频率：45Hz、55Hz 双频

7、输出电流：5A

8、输出电压：420V

9、测量线要求： 电流线铜芯截面积≥1.5mm2

电压线铜芯截面积≥1.0mm2

10、供电电源：AC220V±10％，50Hz

11、外形尺寸：440mm×350mm×210mm

12、仪器重量：18kg

Product introduction

NADWG Series Substation ground resistance tester can test grounding impedance, the contact voltage, step voltage, the diverting potential of all kinds grounding device, and the potential gradient field of surface parameters such as frequency and soil resistivity. NADWG Series Substation ground resistance tester uses different frequency interference technology, strong interference environment can be measured accurately the data frequency 50Hz. Test current is (0 ~ 3.0A), does not improve potential of grounding device, but it also has strong anti-interference ability, it can measurement without the power cut.

Also calledname

Ground network earth resistance tester, Ground Resistance Tester, Earth Ground Resistance Tester, Grounding Resistance Tester

The Characteristics of the products

1、Good measurement of power frequency equivalence. Test current waveform is a sine and two frequencies used in measurement.

2、Anti-interference ability ground voltage. The instrument uses different frequency measurement, with modern hardware and software filtering technology, making the instrument has a very high anti-jamming performance, stable and reliable test data. 15V power frequency (50Hz) interference voltage error caused only 0.001Ω.

3、High precision. Used to measure ground impedance small large ground network.

4、And powerful. Measurable standards prescribed all the features of the grounding device parameters. Not only measure ground impedance, also measure the resistance component and the reactance component.

5、With the break alarm function, to avoid erroneous measurements.

6、Simple operation. Full Englishmenu operation, directly showing the measurement results, and comes with mini printer can print on-site measurements.

7、The wiring labor is small, no large current line.

8、Small size, light weight, easy to carry.

The parameters of the products

Project parameters	Model
	NADWG-3A Substation Ground Resistance Tester		NADWG-5A Substation Ground Resistance Tester		NADWG-5B Substation Ground Resistance Tester
An impedance measuring range	0～15Ω		0～50Ω		0～5000Ω
Resolution	0.001Ω				0.001mΩ
The measurement error	±（reading×1%+0.001Ω）		±（reading×2%+0.005Ω）		±（reading×2%+0.01Ω）
Hnti-interference ability of ground voltage	15V power frequency interference voltage error caused only 0.001Ω		Anti-frequency： 50Hz Interference voltage: 10V		Anti-frequency： 50Hz Interference voltage: 10V
The test current waveforms	sine		sine		sine
The test current frequency	-		45Hz、55Hz dual-frequency		45Hz、50Hz、55Hz、60Hz、65Hz Single Frequency; 45/55Hz、55/65Hz、47.5/52.5Hz Automatic dual-frequency
The outputcurrent	0～3.0A		0～5.0A		1A、2A、3A、4A、5.0A
The output voltage	0～100V		0～420V		0～400V
The measurement line requirements	Thesectionalareaofcopper coreofcurrentlines≥1.0mm2		Thesectionalareaofcopper coreofcurrentlines≥1.5mm2		Thesectionalareaofcopper coreofcurrentlines≥1.5mm2
	The sectional area of copper core of voltage lines≥0.2mm2		The sectional area of copper core of voltage lines≥1.0mm2		The sectional area of copper core of voltage lines≥1.0mm2
Power supply	AC220V±10%，50Hz				AC180～220V，50/60Hz
Use of the environment	Temperature：-10℃～50℃；Relative humidity：<90%
Dimension	440mm×350mm×310mm	440mm×350mm×210mm		320mm×285mm×285mm
Weight	6.0kg	18kg		18kg