KDZD300A Cable Outer Sheath Circular Flow Grounding Tester - Professional, Accurate and Portable Cable Grounding State Diagnosis Tool

1、 Product Overview

KDZD300A cable outer sheath loop current grounding tester is a high-precision and intelligent handheld detection equipment specially designed for power system, mainly used to measure key parameters such as circulating current, grounding current, harmonic component, total harmonic distortion rate (THD), leakage current, frequency and current waveform of metal sheaths of HV and MV power cables (such as aluminum sheath and copper shielding layer) under operation state. The equipment is composed of KDZD300A host and special 300A circulating current clamp. It adopts non-contact measurement mode, without power failure and disconnection, and can safely and efficiently complete field detection tasks under live state.

2、 Core functional features

Non-contact safety measurement
The measurement can be completed by clamping the cable grounding wire with the high-sensitivity current clamp, avoiding the outage risk and operation complexity caused by the traditional disconnection detection, and greatly improving the operation safety and efficiency.

High anti-interference capacity
Current clamp adopts special alloy magnetic core+double-layer magnetic shielding structure to effectively suppress external magnetic field interference. Even under 20 Gauss (GS) strong magnetic field environment, the measurement accuracy within ± 2% can be guaranteed, which is applicable to substations, switchyards and other places with complex electromagnetic environment.

Comprehensive electrical parameter analysis
Real-time display of effective current value (0.5mA~300A AC)
Support 25 harmonic and inter-harmonic analysis (0.0% - 99.9%)
Automatic calculation of total harmonic distortion (THD)
Precise measurement of system frequency (20Hz~400Hz, power frequency band 45~65Hz high accuracy)
Real-time waveform display, easy to identify abnormal current form (such as pulse, distortion, etc.)

High-performance hardware platform
Built-in 32-bit high-speed DSP processor, combined with FFT fast Fourier transform and digital filter algorithm, ensures stable data acquisition, accurate calculation and fast response (sampling rate 3 times/s).

Humanized human-computer interaction
Inch color capacitor touch screen, clear and intuitive Chinese graphic interface, strong visibility in the sun; The menu is simple, the operation logic conforms to the site habits, and the novice can quickly get started.

Persistent endurance and intelligent management
Built-in 7.4V large-capacity rechargeable lithium battery, more than 8 hours of continuous operation
Support automatic shutdown setting and customized sample number to improve field work efficiency
Built-in perpetual calendar, automatically recording test time

Reliable data storage
Up to 104 groups of complete test data (including current, harmonics, THD, time, etc.) can be stored without loss in case of power failure for subsequent analysis and report generation.

3、 Typical application scenarios
Substation/converter station: inspect the sheath circulation of outgoing cables of main transformer and GIS regularly to prevent overheating accidents caused by multipoint grounding or insulation damage.
Power plant: monitor the state of cable grounding circuit of generator outlet and auxiliary power system to ensure the safe operation of the unit.
Urban underground pipe gallery/cable tunnel: Bulk circulating current detection of densely laid cables to assess the health of the earthing system.
Transmission and distribution line operation and maintenance: used for cable fault pre-judgment and grounding mode verification (such as single-end grounding vs. cross interconnection).
Harmonic pollution source troubleshooting: analyze the harmonic current of grounding circuit caused by nonlinear load, and assist power quality control.
Preventive test and condition-based maintenance: as an important tool for cable status evaluation, it is included in the regular inspection process of PMS (production management system).

4、 Main technical parameters

Project Parameters
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Power supply DC 7.4V rechargeable lithium battery, USB charging interface
Current measuring range 0.5mA – 300A AC
Minimum resolution 0.1mA
Frequency range 20Hz – 400Hz (power frequency range: 45 – 65Hz)
Harmonic analysis 1 - 25 harmonics+interharmonics, 0.0% - 99.9%
THD 0.0% - 99.9%
Measurement accuracy (magnetic field interference ≤ 15GS) ± 1% ± 3 words
Sampling rate 3 times/s
Jaw size 80mm (for common earthing cables)
Display screen 3.5-inch color capacitor touch screen
Groups of data storage with time stamp
Operating temperature - 10 ℃~+50 ℃
Ambient humidity ≤ 80% RH (without condensation)
Overall size 218 × 98 × 48 mm
Net weight 650g (including battery)

5、 Summary of Summary

KDZD300A cable outer sheath loop current grounding tester integrates high accuracy, strong immunity, multi-function and portability, and is an ideal tool for power system operation and maintenance personnel to carry out cable grounding state evaluation, fault warning and power quality analysis. The non-contact, uninterruptible and intelligent design concept significantly improves the safety and efficiency of on-site inspection, and is widely used in the cable operation and maintenance scenes of power grid, power plant, rail transit, petrochemical, metallurgy and other industries, providing strong support for the safe and stable operation of the power system.
 

Summary of product features of KDZD300A cable outer sheath loop current grounding tester:

Non-contact safety measurement: it can be quickly detected by clamping the grounding wire without power off or wire removal, so as to ensure operation safety.
High-precision anti-jamming: special alloy clamping core and double-layer magnetic shielding technology are used to maintain ± 1% - 2% high precision under strong magnetic field (≤ 20GS).
Multi-function integration: it can synchronously measure the circulating current, grounding current, leakage current, frequency, 25th harmonic, inter-harmonic wave and total harmonic distortion (THD), and display the waveform in real time.
Intelligent and efficient operation: 32-bit DSP+FFT algorithm, fast sampling and accurate data; Inch color touch screen, Chinese interface, clear and visible in the sun.
Portable long endurance: only 650g, built-in large-capacity lithium battery, continuous operation for over 8 hours, suitable for outdoor long-time operation.
Convenient data management: support customized number, automatic recording time of the perpetual calendar, store 104 groups of data, and do not lose after shutdown.
Wide range of applicable scenes: specially designed for complex electromagnetic environment such as substation, power plant and cable tunnel, applicable to cable state patrol inspection, fault diagnosis and preventive maintenance.
 

technical parameter
1. Working power supply DC 7.4V large-capacity lithium rechargeable battery conversion USB charging interface
2. Rated current 150mA max
3. Range current: 0-300A (AC); Frequency: 20Hz ～ 400Hz
4. Frequency: 45 ～ 65Hz (for measurement of power frequency 50Hz signal)
5. Cable outer sheath ring current grounding accuracy:
Field disturbance B 5GS ± 1% ± 3 words
Field disturbance B ± 1% ± 3 words at 10GS
Field disturbance B 15GS ± 1% ± 3 words
Field disturbance B ± 2% ± 3 words at 20GS

6. Minimum resolution 0.1mA
7. Harmonic ratio 25 times, with inter-harmonics, 0.0% - 99.9%
8. THD 0.0% ～ 99.9%
9. Sampling rate 3 times/s
10. Jaw size 80mm
11. Current effective value display: 0.5mA-300A
12. Internal data storage 104 groups
13. Inch color LCD screen, support capacitor screen touch
14. Operating temperature - 10 ～ 50 ℃
15. Environment humidity ≤ 80% RH, no condensation
16. Storage condition - 20 ℃ - 60 ℃, ≤ 95% RH, no condensation
17. Volume length 218mm × width 98mm × height 48mm
18. Net weight of complete machine: 650g (including battery)