GDGZ-1830 Street Lamp Cable Fault Tester

GDGZ-1830 Street Lamp Cable Fault Tester

general narrate, recount, state

GDGZ-1830 Street Lamp Cable Fault TesterIt is a specialized testing instrument developed by our company based on the fault characteristics of streetlight cables. It is an excellent product for testing streetlight cable faults. Can quickly test streetlight cablesGrounding (including short-circuit grounding and open circuit grounding)Fault. After several years of upgrades and replacements, it has become easier to use and more accurate to test. One click operation, tedious operation of similar products.Just one operation is enough to master everything.Equivalent to a tool type instrument, it can be used without training.

This instrument adopts a microcomputer central processing unit and a dedicated integrated circuit. Its characteristics are high receiving sensitivity, small static drift, strong anti-interference ability, stable operation, and high accuracy. The instrument is more robust and durable, thereby reducing the repair rate of the instrument. Due to the use of high-capacity batteries for power supply, the instrument has the advantage of longer battery life.The A-frame and its electronic circuit board adopt an integrated design, while the same industry's split design avoids the trouble of wiring. At the same time, it also reduces the incidence of instrument failures.

GDGZ-1830 Street Lamp Cable Fault Tester

1basic componentsAnd its main purpose

This instrument consists of the following three parts:

lsend shoot Machine: Automatically test the ground impedance of the streetlight cable and send a test signal to the tested streetlight cable.

Routing receiver: Receive signals near the streetlight cable and detect the routing and burial depth of the streetlight cable.

lInsulated receiver（A-frame: Detecting ground insulation faults in streetlight cables.

GDGZ-1830 Street Lamp Cable Fault Tester

IItechnical indicators

1. Detection distance<25Km

2. Detection depth ≤ 3m

3. Routing error<5cm

4. Positioning error<5cm

5. The distance between the sensing fault point is ≤ 30m

6. Positioning range: ≤ 5M Ω

3、 Operationexplanation

3.1 Preparation before detection

1. Check the battery level

send shoot Machine: After turning on, the battery voltage is displayed. If it is lower than11.5VSuggest charging.

Insulated receiver: After power on, there is a few seconds of battery display. If the display is lower thanIf there are 5 grids or no display, the battery should be replaced.

Routing receiver: When the receiving sensitivity decreases, the battery should be replaced.

2. SuspendedCable ends

In general, the end of the tested street lamp cable is disconnected from the ground. Simply disconnect the starting end of the cable from the distribution cabinet (the neutral wire grounding must be untied).

3.2 Instructions for using the transmitter

Attention: When the transmitter is working, the peak output voltage can reach1000V (open circuit voltage)Do not touch the output terminal with your hands to prevent electric shock. Do not connect the transmitter to an electrified cable, and do not short-circuit the output directly. As shown in the figureAs shown in Figure 1

1. Please turn off the transmitter before connecting it.

2. Insert the red and black output wires into the corresponding output sockets on the transmitter.

3. The red output line is connected to the faulty core wire of the street lamp cable. Be careful not to connect the clamp of the red output line to leaves, grass, mud, etc., otherwise it may cause reading errors.

4. Pull the black output line in the opposite direction (or perpendicular direction) to the street light cable. It should be inserted in the opposite direction to the fault point, the farther the better.

5. Insert the ground wire into the ground, clamp the clamp of the black output line onto the ground wire, and ensure good contact.

6. Turn on the power switch of the transmitter, and the display screen will first show the battery voltage, and then automatically display the impedance value on the line. The severity of the fault can be determined based on the display of the transmitter, and the smaller the resistance value, the more severe the fault. Generally, the range is 0-100K ΩFor serious malfunctions,100K～500KFor moderate faults,A fault above 1M Ω is considered minor.

picture1. Transmitter connection diagram

3.3 Function and usage of routing receiver

1） The role of routing receiver

Detecting the routing and burial depth of streetlight cables. The detection principle is based on peak value method and null value method.

Peak method (rough measurement method)Rotate the probe and probe rod to 90 degreesAngle and parallel to the ground, and perpendicular to the direction of the streetlight cable. At this point, when the received signal is strong directly above the streetlight cable (indicated by a large pointer on the meter), this point is the peak pointThis detection method is called peak method (see Figure 2). Move the probe left and right along the direction of the street lamp cable, and the signal weakens (the pointer of the meter head drops), that is, the sound in the middle is loud (the pointer of the meter head indicates more), and the sound on both sides is small (the pointer of the meter head indicates less). The line connecting the peak points measured is the direction of the streetlight cable. Used for rough measurement of routing.

Null value method(Precision measurement method): If the probe and probe rod are rotated toAt a 0 degree angle, the probe is perpendicular to the ground. When the signal received is weak directly above the streetlight cable (indicated by a small pointer on the meter, this point is called a null point), this detection method is called the null point method or the mute point method (see Figure 3). Move the probe left and right along the direction of the street lamp cable, and the signal becomes stronger (the pointer indication on the meter head increases), that is, the sound in the middle is smaller (the pointer indication on the meter head is smaller), and the sound on both sides is louder (the pointer indication on the meter head is larger). The line connecting the null points (or dummy points) is the direction of the street light cable. Used for precise routing testing

The size of the sound emitted by the buzzer is synchronized with the indication size of the meter pointer.

2） How to use the routing receiver

①Turn on the power knob of the router receiver

②Search for the tested streetlight cable at the beginning

The method is to use the peak method mentioned above to detect every nearby street light cable 3 meters away from the transmitter. The pointer on the meter head indicates that the high point is the street light cable to be tested.

③Continue to explore cable routing

At this point, switch to using the null value method to detect the routing of streetlight cables, as this method is more accurate in detecting without other interference.

During the detection process, the signal strength on the streetlight cable will decrease with increasing distance. To ensure the accuracy of detection, the routing receiver should make the header pointer point to when receiving strong signals60-80μATherefore, the power knob should be adjusted in a timely manner.

3) Detecting the burial depth of streetlight cables

The method is as follows: First, use the null value method to find the routing of the street lamp cable, which is defined asAPoint; Then rotate the probe and probe rod toAt a 45 degree angle, the lower end of the probe is attached to the ground and vertically aligned with the direction of the street lamp cable, moving horizontally to the left (right). When the received signal shows a null value, that is, when the pointer approaches zero, record this point asB（C）On its groundAB（AC）The straight-line distance of a point is the burial depth of the streetlight cableADThe general error is±5CMabout. (See figure)4) This method is also called triangulation:

Actual burial depth=AD+correction factorδ　　（δ＝±5cm）

picture4

Attention: The accuracy of detecting the burial depth of streetlight cables may be affected by soil conditions, adjacent streetlight cables, and the metal material of streetlight cables. When detecting burial depth, one should avoid the bends in the streetlight cable and leave the transmitter10Beyond meters to avoid inaccurate depth determination or increased errors.

3.4 Instructions for using insulated receiver (A-frame)

picture5A rack display

Turn on the insulation receiver switch and display the battery level within a few seconds. Afterwards, display the received signal strength and direction, as shown in the figureAs shown in Figure 5.

1) Calibration

To synchronize the insulated receiver and transmitter during testing, both should be calibrated,Simultaneously turning on and off the transmitter and receiverCalibration work can be carried out near the grounding point or fault point.

When near the grounding pointThe calibration steps are as follows:

① Insert the A-frame into the ground;

② Simultaneously turn on the transmitter and A-frame switch, and wait until the arrow on the A-frame flashes (indicating that the battery level test is complete);

③ If the arrow points in the opposite direction to the grounding point of the ground wire, it can be confirmed that there is an insulation fault point in the line; The transmitter and receiver signals are synchronized. Calibration completed.

2) Detecting faults

① The A-frame should move parallel to the cable of the tested street lamp;

②Insert every 3-6 metersA-frame (the specific spacing should depend on the actual ground conditions. If the ground is wet, the spacing can be slightly larger; otherwise, the spacing should be slightly smaller), move forward along the direction of the cable. During the forward process, it should be ensured that the A-frame ground pin is in good contact with the ground.

③In the process of moving forward, ifThe display grid of the barcode on the A-frame increases, while the arrow steadily points forward. It indicates that the A-frame is approaching the fault point. At this point, the distance that the A-frame moves each time should be reduced to avoid missing the fault point.

④Keep moving forward, everyInsert the A-frame once every 0.5 meters until the direction of the arrow changes, indicating that the fault point has been passed. Then change the direction and move the A-frame backwards until a slight movement causes a change in the direction of the arrow, and the fault point is located below the center point of the A-frame.

⑤To find the accurate fault point, the cross method can be used. Specifically, use the above method to find the suspected fault point in the direction parallel to the cable path. Then use the above method in the direction perpendicular to the cable to find the suspected fault point, and the two overlapping points are the fault points.

3) Check the fault point

①Translate into EnglishTake the A-frame to one side of the street lamp cable;

②At suspicious pointsInsert the A-frame into the ground in all directions (such as clockwise), and the arrow should always point to the fault point;

picture6. Check the fault points

4 special circumstances

4.1 Route detection

1. The impact of adjacent streetlight cables

When the signal strength measured on one side of the streetlight cable is much lower than the other side, it may be influenced by other streetlight cables adjacent to the streetlight cable. At this point, the grounding wire should be reinserted to minimize the output line passing through any adjacent street light cables, and the grounding wire should be kept as far away from the tested street light cable as possible. The peak method is used for testing, and the cable of the tested street lamp is located below the large pointer on the meter head.

2. Detect the turning point of the streetlight cable

When using the null value method to test the routing of streetlight cables, one should approach the turning point of the streetlight cable at a slow speed so that the specific position of the turning can be measured near the outer side of the streetlight cable. If detected at a faster speed, one may pass through a turn and suddenly notice an increase in the indicator on the meter head, leading to misjudgment.

3. Surrounding detection

Use the null value method for detection. When the probe reaches the surrounding area of the street lamp cable, if the probe swings to the opposite side of the surrounding area, the routing receiver will reflect a normal peak value; When swinging directly above the surrounding area, a very strong peak will appear.

4. Detecting in densely populated areas

Adjacent streetlight cables can interfere with the normal reception of routing receivers. At this time, the signal strength of the tested street lamp cable should be increased, and the signal strength of adjacent street lamp cables should be reduced. The method is as follows:

① Switch the transmitter to the other end of the tested streetlight cable to send the signal;

② Improve the grounding situation and move the grounding point of the grounding rod.

4.2 Fault detection

When the fault point is located below the road surface or other unmeasurable areas, the measurement is as follows:

1. Vertical method detection

Carefully detect the routing of faulty streetlight cables,The A-frame is parallel to the streetlight cable. When approaching the fault point, the number of barcode display cells begins to increase until reaching the fault point. When the middle point of the A-frame is located on the vertical line of the insulation fault point of the sheath, the direction indicated by the arrow will change rapidly, and the displayed grid number will become zero (in reality, the grid number is mostly 1-2 grids).

picture7 Vertical method detection

2. Detection method for fault points located under the road surface

When the fault point is located below the road surface or other hard surfaces, a sponge cover can be used. Soak the sponge cover in water, thenInsert the A-frame ground needle into the sponge cover and detect it using the normal method. When detecting, the sponge cover should be kept as moist as possible, but the two sponge covers should not be connected by water, which may cause a short circuit in the signal. Or sprinkle some water on two ground needles.

3. Detection methods for long lines

During the process of detecting insulation fault points, as the distance between the fault point and the transmitter increases,The signal received by the A-frame will have a proportional decrease. When the signal strength drops to the point where the A-frame cannot receive it, it will become undetectable. At this point, the sensitivity of the A-frame can be improved by increasing the distance between the two ground pins of the A-frame by using additional streetlight cables. As shown in Figure 10.

picture8. Use of additional streetlight cables

5. Detection of high and low impedance insulation fault points

Understanding the severity of ground insulation faults in streetlight cables before detecting fault points, that is, measuring the ground insulation impedance of streetlight cables, is very beneficial for detecting fault points. When the ground humidity is high or the streetlight cable is severely damaged, the impedance of the detected fault point is low, generally less than 10K Ω. When the ground humidity is low or the streetlight cable is lightly damaged, the impedance of the detected fault point is high, generally ranging from 1 to 3ＭΩ. When the impedance of the fault point of the streetlight cable is low, it is easy to detect the fault point due to the strong signal strength on the streetlight cable. Generally speaking, the more severe the fault, the more barcode grids displayed on the A-frame display screen.

It is difficult to detect fault points with high impedance to ground in streetlight cables. Generally speaking, the larger the impedance of the fault point,The smaller the response range of the A-frame to fault signals. Therefore, when detecting fault points with high impedance, the routing of the streetlight cable should be checked first. Ensure that the fault is located directly above the cable.

6. Detection of multiple fault points

It is difficult to detect multiple fault points simultaneously on the streetlight cable. In this case, the routing of the streetlight cable should be accurately located first. Try to detect and confirm every suspicious fault point above the streetlight cable. The best method for detecting multiple fault points is to first repair the confirmed fault points as much as possible before continuing the detection.

5 Precautions

This instrument is used for outdoor workThe instrument should be kept clean and dry. When not in use, the instrument should be placed in a packaging box and stored in a low-temperature, dry place. Before each operation, the battery levels of the transmitter, routing receiver, and insulation receiver should be checked. When the instrument is not used for a long time, the batteries in the routing receiver and insulated receiver should be removed; The transmitter should be stored after being fully charged and charged every 2-3 months to prevent battery aging.

5.1 Charging method for transmitter battery

*Charging requires10-20 hours.

①. Turn off the transmitter;

②. Insert the power plug of the charger into 220V/50HzAC socket ；

③. Insert the charging plug of the charger into the charging socket on the transmitter. The red indicator light on the charger will turn on, indicating that the charger has entered charging mode. After 10-20 hours of charging, the green light will turn on to indicate that the charging is complete;

④. After charging, unplug the charging plug. Turn on the transmitter and display the battery voltage.

5.2 Routing receiver battery replacement method

①. Prepare a 9V (block) battery;

②. Unscrew the circular battery box cover behind the handle of the pathfinder;

③. Remove the old battery and replace it with a new one;

④. Tighten the battery box cover.

5.3 Insulation receiver battery replacement method

There are two screws on the lower side of the main body of the insulated receiver. By unscrewing these two screws, you can open the battery box cover and use a new one9VReplace the old battery with a new one, then close the battery box cover and tighten the screws.