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33、HRWGR Anti-interference Detector of Grounding Resistance for Earthing Grid
※Instruction of HRWGR Anti-interference Detector of Grounding Resistance for Earthing Grid
 It applies the controlling, sampling, data processing of microcomputer and displays by the large screen of liquid crystal. Testing the large erathing grid of power plant and substation by the abnormal frequency keeps high accuracy and stabilized performance; and efficiently resolves the industrial frequency current-interference. With only 1~3A testing current and 4kg weight, it greatly eases the labour intensity during the test.

Output current: AC3A or 5A (it can be used with computer on-line operation, our recommended product with high cost performance)
Output voltage: AC0~120V
Measuring range: 0~100Ω~500Ω
Measurement error: <1%
Connection: trilinear, four-line

In addition, it provides DER2571A/B(ZC-8)type terrameter and multifunctional grounding terranmeter with double jaw, which is suitable for any grounding occasions and conditions, and proceeds the online measuring of soil resistivity and circuit connecting resistance.

     HRSQ Multifunctional Tester for Grounding Resistance with Double Jaw
Technical characteristics:
1. In any grounding occasions, it can carry out the test normally by using double-measuring method: non-contacting and accessing piles. No matter the amount of grounding point is multiple or single.
2. Online measuring is available. It can test the electric equipment under its working condition without cutting from the grounding part.
3. The capacity of anti-interference is strong. Even in the 500kV transformer substation, it can produce the high-frequency current to filtrate the harmonic interference, like 50Hz or 100Hz from the electric current, then feedback the accurate results.
4. The soil resistivity can be displayed automatically without trivial calculation.
5. The inner storage with large capacity can save 100 groups of measuring datas.
6. The collocating charger and secondary battery is designed for electricity saving, it will be cut automatically when exceeding schedule time.
7. Four-line measurement ensures the accuracy of testing for the grounding resistance below 0.7Ω.
8. The alarming system warms if surpassing the limitation or using the incorrect testing condition.
9. Self-testing is also available.

Application Range:
1. Non-accessory electrode measuring for grounding resistance of communication and power system is available to do the test on the concrete-covering ground.
2. The soil resistivity measuring under the earthing grid construction is easy to calculate the depth of the grid for builder.
3. The digital tester for traditional grounding resistance has a full-scale application, which is replacing the pumping traditional meter.
4. The resistance tester is connected in the looping circuit.

Technical indexes:
1. Measuring range: 0.01Ω-1000Ω
2. Capacity: 100 groups of datas
3. Humidity:10%~80%RH
4. Weight: 0.8 kg (no accessories)
5. Resolution: 0.01Ω
6. Temperature: -10℃ ~40℃
7. Electrical source: four NO.5 MH/Ni charged batteries
8. Overall dimension: 230×120×42mm
9. Dimension of pliers: Φ55mm


34、HR Series of Megohm-meter (Insulated Resistance Meter)
    It is applicable for testing the in insulated resistance of all kinds of transformer, generator, cable, switch, and electric devices. The design of low-watt-loss and electrostatic-proof makes the outdoor operating possible.

Technological indexes:
Output voltage:500V、1000V、2500V、5000V、10000V
Measuring range: 0~400GΩ
Displaying mode: numerical or index display

35、HRGP Power Frequency Signal Generator
    It can be used for calibrating the frequency, synchronous current, and voltage for AC devices and meters with single phase.
Output voltage: 0~450V,50W
Stability: 1‰
Measuring precision of frequency: 0.1 grade
Measuring precision of voltage: 0.2 grade
Range of frequency: 35~75Hz

36、HRPX Industrial Frequency Phase Meter
    The main technical indexes
Measuring method of phase: either two lines U-U、U-I、I-I
Measuring precision of phase: 0.2 grade
U(U-I method), 10mA~10A divided into 4 grades
I(on-line detaction100mA~5A)
Range of frequency testing: 40~60Hz, maximum error is 0.01Hz , and it can measure the frequency of either one line or two lines
Signal voltage input: 5~500V
Current signal input: 0.5~5A
Range of tested power factor: cosφ1~0 sinφ0~1

37、HRZLY Series Vacuum Oil-filter  
    This kind of vacuum oil-filter has combined original design, compact structure, light and flexible features, low power consumption, high effect, and convenient operation together. Besides, adding high effective impurities-absorbers during the testing period can filtrate water, impurity, and harmful gas, and also improve products’ quality and dielectric strength.

The main technical indexes:
Capacity of oil-purifying: 30、50、100L/min
Working rated pressure:500kPa
Working vacuum degree: ≤99kPa
Limit vacuum degree :<100kPa
Remaining water:≤5ppm
Puncture voltage ≥50kV(electrode gap:2.5mm)
Air content:below0.5%
Heating power:2×2;2×3;2×3.5;2×4KW

38、HRZJ3 Microcomputer-Typed Detector of Anti-distributed Capacitive Type Direct current Grounding  

With continuous improvement of 20 years, it keeps the advanced technology and creates the domestic origination.
Technological characteristics:

It is a new generation invented on the basis of HRZJ1 and HRZJ2 type.
1. It is possible to find out one-point or multi-point abort situation without installation, electrical cutting, and insulated pumping.
2. It directly displays grounding resistance data, which is convenient to master insulating condition. Range: 0-99KΩ
3. It directly displays grounding electrical capacity data, which is convenient to master electrical capacity disturbing condition. Range: 0-99uKor 0-99KΩ.
4. Directly displaying the grounding direction can lead the instructors to search rapidly.
5. It can adjust to the AC& DC looping current grounding, token-ring power supply grounding, and diode isolation power supply grounding.
6. Referring to semiconductor light grounding, it is easier to find out complicated signal loop.
7. Pliers with “heart-shape” designing, it shares the big or small lines without changing pliers.
8. 24V、48V、110V、220V direct current system shares a suit of direct current grounding detector.
9. Detecting sensitivity: ≥50KΩ, both index and numerical display is available, which is easy to judge. Special requirement can reach ≥100KΩ
10. Accuracy:100%
11. Anti-electrical capacity disturbance:>1200KΩ/uF
12. Signal output power: <0.15w, containing protection of current limitation, which has no influence on relay protection of power system, and automatic or operative loop, using safely.
13. Signal frequency stability: ±0.02Hz
14. Dimension of signal generator:280mm(width)×100mm(height)×300mm(depth)
15. dimension of portable machine:126mm(width)×70mm(height)×156mm(depth)
16. Deluxe Copper-aluminum Outer package is easy to carry.
17. AC & DC power supply: AC/DC 220V

  (Ⅵ)on-line detecting products  
39、HRBJZ Portable On-line Detecting System of Dielectric Loss and Resistant Current for Substation
  40、HRBJT Distributed On-line Detecting System of Electric Equipment on Insulation for Substation  
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China, Wuhan WuGao HuaRui High Voltage Technology Co.,Ltd.
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