Underground Cable Fault Tester
DARUI Electric recommends
Instrument Parameters
1. Transmitter
1) Output Signal: Outputs multiple frequencies of sinusoidal AC signals, namely 1kHz, 2kHz, 8kHz, 33kHz, 65kHz, 83kHz, 128Hz, 512Hz.
2) Output Power: Constant power output, with low, medium, and high gears.
3) Output Modes: Direct connection method, coupling method, induction method.
4) Impedance Display: Within 99999 ohms.
5) Load Matching: 1-10000 ohms.
6) Display Interface: Large-screen LCD with Chinese and graphical display, with backlight.
7) Power Supply: Standard No.1 1.2V rechargeable batteries, 6 pieces, rechargeable/dischargeable 500 times.
8) Battery Life: Continuous operation 4h to 8h.
9) Overheat and Overcurrent: Automatic protection.
10) Working Temperature: -10°C to +55°C.
2. Receiver
1) Receiving Frequency: Receives multiple different frequencies of sinusoidal AC signals, namely 1kHz, 2kHz, 8kHz, 33kHz, 65kHz, 83kHz, 128Hz, 512Hz, 50Hz;
2) Receiving Modes: Peak method (horizontal coil), valley method (vertical coil), external device method (coupling clamp);
3) Signal Interface: Three interfaces simultaneously indicate signal strength: digital magnitude, grating length, and sound urgency;
4) Sound Indication: Frequency-modulated tone that varies with signal strength;
5) Current Indication: Displays the effective current value of the cable under test (unit: mA);
6) Signal Strength Indication: Ladder diagram, digital range 0 to 999;
7) Display Interface: Large-screen LCD with Chinese and graphical display, with backlight;
8) Gain Control: Manual adjustment, dynamic range 000 to 100dB;
9) Detection Length: When directly connected to cable, up to 15KM;
When coupling to cable, one coupling can measure 3Km, multiple couplings unlimited distance;
When inducing on cable, one induction can measure 300m, multiple inductions unlimited distance;
10) Depth Measurement: Direct reading of detection depth, range 000 to 250cm;
80% method depth measurement, range 000 to 250cm (induction) 500cm (direct connection);
11) Current Measurement: Direct reading of current, range 000 to 999mA;
12) Measurement Range: 0 to 6m and above; Positioning accuracy: 5% of depth (depth range 0 to 3m); 10% of depth (depth range >3m);
13) Power Supply: Standard No.5 1.2V rechargeable batteries, 6 pieces, rechargeable/dischargeable 500 times;
14) Standby Time: Continuous operation >8h; intermittent operation >16h;
15) Overheat and Overcurrent: Automatic protection;
16) Working Temperature: -10°C to +55°C.
Working Principle
This instrument is a high-tech product designed based on the principle of electromagnetic induction, grounded in the theory of step voltage, combined with digital filtering, wireless reception, and software control. Electromagnetic induction: Its basic working principle is that the transmitter generates electromagnetic waves and transmits the signal to the underground metal pipeline under test through different transmission connection methods. After the underground metal pipeline senses the electromagnetic wave, an induced current is generated on the surface of the underground metal pipeline. The induced current propagates along the metal pipeline to a distance. During the propagation of the current, it radiates electromagnetic waves to the ground through the underground metal pipeline. Thus, when the YHGXY-C multifunctional full-frequency cable detector receiver is used for ground detection, it can receive electromagnetic wave signals on the ground directly above the underground metal pipeline. By analyzing the changes in signal strength, the position and direction of the underground metal pipeline can be determined.
Conditions for realizing this principle: First, there must be a signal source capable of emitting sufficient electrical energy to form a current in the circuit that transmits electrical energy. The current generates a magnetic field around the line during its flow; second, there must be a circuit capable of receiving this specific magnetic field and displaying the changes in the magnetic field in the form of electrical signals. |
Instrument Features
1) Portable and lightweight, easy to use, powered by rechargeable batteries, can be operated by one person, and four tests can be completed at once.
2) Digital design, software control, stable and reliable performance.
3) Large-screen LCD interface with Chinese display, easy to understand, learn, and master.
4) The measured information is provided to the operator in three ways: digital magnitude, grating length, and sound urgency, making the testing process easy and relaxed.
5) The transmitter has constant power output and automatic matching, ensuring the machine operates in the best condition. Built-in ohmmeter function automatically measures the cable's loop impedance to ground and between phases, which can help determine the nature of the fault.
6) Has backlight function, suitable for night operations.
Application Scope
Since the product was introduced to the market, due to its powerful functions and superior performance, it has been widely used in urban power supply bureaus, county power bureaus, railway power supply sections, large and medium-sized enterprises (petroleum, chemical, coal mine, power plants, steel plants), colleges and universities, residential communities, urban street lighting, highways, China Railway, China Construction, and other departments. With our strong technical support, it plays an important role in rapid repair and quick troubleshooting of cable faults for power supply and consumption departments.
Note: The above information and technical parameters are compiled and released by Yangzhou DARUI Electric Co., Ltd.
