選擇品牌

DV Power > 低電阻歐姆計

接地網測試儀

Ground Grid Testers 型號：GGT 系列

接地網完整性和連續性測試在 IEEE 80 - 2013 標準中有所描述，它是測量接地系統電氣特性最有效的測試方法和技術之一。它也被稱為大電流測試法，其目的是透過注入大測試電流（最大 300 A）來檢查埋地接地導體和連接器、接地棒和接合連接的連續性。

加入洽詢

產品特點產品規格 Features Specifications

接地網完整性和連續性測試在 IEEE 80 - 2013 標準中有所描述，它是測量接地系統電氣特性最有效的測試方法和技術之一。它也被稱為大電流測試法，其目的是透過注入大測試電流（最大 300 A）來檢查埋地接地導體和連接器、接地棒和接合連接的連續性。

接地網測試儀（GGT 系列）包括兩個型號 - GGT200 和 GGT300。這兩種型號的主要區別在於最大測試電流。

DV Power GGT200 和 GGT300 設備與 GGT-M 模組結合，是變電站和其它電力設施內接地系統接觸電阻測量的理想測試系統。透過 GGT 設備和 GGT-M 模組之間的無線通信，可以遠端啟動/停止測試並監控測量結果。

接地網完整性測試是透過在受檢接地點和參考接地點（如變壓器接地點）之間注入連續的直流電流來進行。最後，根據所獲得的電流方向和幅值、電壓降以及接觸電阻值等信息，確定接地網的狀況。

此外，GGT200 和 GGT300 設備還可用作功能強大的高精度微歐姆計，用於測量非電感測試對象（如斷路器）的接觸電阻。由於具有雙接地和遠端控制功能，該儀器即使在最嚴苛的環境下也能進行精確測量，為測試人員提供更多安全保障。

GGT 具有上述功能，是檢測接地系統以及測量中高壓斷路器、隔離開關、匯流排、電纜接頭和接地/連接等不同大電流連接的接觸電阻的理想測試系統。

Mains power supply

Connection according to IEC/EN60320-1; C320
Mains supply: 90 V – 264 V AC
Frequency: 50 / 60 Hz
Circuit Breaker with thermal overload protection - 20A/240V AC
- Designed according to UL 1077 standard
  (Supplementary Protectors for Use in Electrical Equipment)
- For primary protection of the electrical panel, a circuit breaker according to the UL 489 standard shall be used

Output data

Test current ranges and load intervals:
up to 200 A unlimited test time
300 A* 10 min maximum test time
*Available with GGT300 model

Full Load Voltages:

Main supply voltage	Output current	Maximum output voltage
230 V AC	300 A 200 A	8,2 V DC 8,6 V DC
115 V AC	300 A 200 A	7,2 V DC 7,5 V DC

Measurement

Resistance range: 0 – 999,9 mΩ
Resolution
- 0,1 µΩ – 999,9 µΩ 0,1 µΩ
- 1,000 mΩ – 9,999 mΩ 1 µΩ
- 10,00 mΩ – 99,99 mΩ 10 µΩ
- 100,0 mΩ – 999,9 mΩ 0,1 mΩ
Typical accuracy ± (0,1 % rdg + 0,1 % FS)

Display

LCD screen 20 characters by 4 lines
LCD display with backlight, visible in bright sunlight

Test result storage

500 measurements
USB flash drive feature

Interface

• USB communication with PC
Optional: RS232 and Bluetooth
Wi-Fi communication between GGT device and GGT-M module

Dimensions and weight

GGT200 & GGT300 dimensions:
- 503 x 406 x 193 mm / 19.8 x 15.9 x 7.6 in
GGT-M module dimensions:
- 226 x 116 x 50 mm / 8.9 x 4.5 x 1.9 in
GGT200 & GGT300 devices weight:
- 14,6 kg / 32.1 lbs
GGT-M module weight: 0,95 kg / 2.1 lbs

Environment protection

Ingress protection rating:
- GGT200 & GGT300: IP67 with closed lid
- GGT-M module: IP40

Environment conditions

Operating temperature
- -20 ºC - +55 ºC / -4 ºF - +131 ºF
Storage & transportation:
- -40 ºC - +70 ºC / -40 ºF - +158 ºF
Up to 95 % relative humidity

Applicable Standards

Installation/overvoltage: category II
Pollution: degree 2
Safety: LVD 2014/35/EU (CE Conform) EN 61010-1
EMC: Directive 2014/30/EU (CE Conform) Standard EN 61326-1:2006
CAN/CSA-C22.2 No.61010-1, 2nd edition, Including Amendment 1

All specifications herein are valid at ambient temperature of + 25 °C and standard accessories.
Specifications are subject to change without notice

The ground grid integrity and continuity test are described in IEEE 80 – 2013 standard, and it is one of the most efficient test methods and techniques for measuring the electrical characteristics of grounding systems. It is also known as a high-current test method, whose purpose is to check the continuity of buried ground conductors and connectors, ground rods, and bonding connections by injecting a high-test current (up to 300 A).

Ground Grid Testers (GGT Series) consist of 2 models – GGT200 and GGT300. The main difference between these models is the maximum test current.

DV Power GGT200 and GGT300 devices, in combination with the GGT-M module, make an ideal test system for contact resistance measurement of the grounding systems within the substations and other electrical facilities. Wireless communication between the GGT device and the GGT-M module enables remote start/stop of the test and monitoring of measured results.

The ground grid integrity test is performed by injecting continuous DC current between the inspected grounding point and the reference grounding point (e.g. transformer grounding). Finally, the condition of the ground grid is determined based on the obtained information about the current flow direction and amplitude, voltage drop, and as well as inspection of the contact resistance values.

Furthermore, GGT200 and GGT300 devices can also be used as powerful high-precision micro-ohmmeters for contact resistance measurement of the non-inductive test objects (e.g. circuit breakers). Due to its Both Sides Grounded and Remote-Control functionalities, the instrument accurately measures even in the most demanding environments, providing additional safety to testing personnel.

With the above-stated capabilities, GGT is an ideal test system for inspection of the grounding systems, as well as for contact resistance measurement of medium- and high-voltage circuit breakers, disconnecting switches, high-current bus bar joints, cable splices, and different high-current links such as earthing/bonding connections.