Xi'an Xu&Hui Electromechanical Technology Co., Ltd.
| Payment Terms | T/T |
| Supply Ability | 3000unit/year |
| Delivery Time | 5-8 work days |
| Packaging Details | wooden packaging |
| Brand Name | XZH TEST |
| Model Number | XHGG521C |
| Certification | ISO CE |
| Place of Origin | Xi'an Shaanxi China |
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Product Specification
| Payment Terms | T/T | Supply Ability | 3000unit/year |
| Delivery Time | 5-8 work days | Packaging Details | wooden packaging |
| Brand Name | XZH TEST | Model Number | XHGG521C |
| Certification | ISO CE | Place of Origin | Xi'an Shaanxi China |
| High Light | ≥15000V Cable Fault Locator ，Rough Measurement Cable Fault Detector ，Portable Cable Tester | ||
The XHHG521C High-Voltage Bridge is a cable fault locator built on the Murray bridge principle. It is designed to locate the breakdown points of laid cables, as well as defect points that have not yet broken down but show an abnormally low insulation resistance. It is equally suitable for locating the defect points of all kinds of cables inside a cable factory.
The unit is powered by a switching-mode high-voltage constant-current source that delivers an open-circuit voltage of 15000V and a short-circuit current of 50mA. A high-sensitivity amplifier and a galvanometer indicate balance and, together with the ratio potentiometer, form a balanced bridge. The measuring cable is a specially designed twin-core high-voltage rubber cable, and a four-terminal resistance measurement method eliminates the error introduced by the lead resistance. The cable is reliably grounded through a braided shielding layer, the panel knobs remain at low potential, and the bridge is operated through an insulated rod. The high-voltage constant-current source and the bridge are integrated in a single portable aluminum-alloy case, which makes the instrument high in voltage yet light in weight, easy to operate and safe to use.
Compared with the wave-reflection method, the bridge-balance method has no blind zone. It is especially suitable for judging short cables and breakdown points close to the cable ends, and it is easy to operate.
Key FeaturesUnlike wave-reflection (TDR) locators, which leave a blind zone near the cable ends, this high-voltage bridge is built for users who need to locate short cables, near-end breakdown points, high-resistance linear breakdown points and flashover points precisely. It is especially suited to the following users:
1. Professional cable fault locating teamsFor example, the cable repair and test teams of large and medium-sized power supply bureaus and of large power-consuming enterprises. Most cable breakdown points can be located roughly and quickly with this high-voltage bridge; used together with the wave-reflection method and a pinpointer, the two methods complement each other and make the location faster and more reliable.
2. Small usersFor example, small power supply bureaus and medium-sized power-consuming enterprises. When there are few cables, the routes are fairly clear, the cables are not too long and faults are limited in number, a complete set of wave-reflection locating instruments is costly and demands high operator skill and experience, so it is not the best choice. This instrument is easier to operate, can handle the daily need, and is a better option.
3. Cable manufacturersInside the factory it can be used to locate the breakdown points of all kinds of cables; fitted with a digital capacitance meter, it can also find open-wire points. The unit is light in weight and convenient to carry to the site to provide locating service for cable users.
Typical Fault Types It Handles| Parameter | Value |
|---|---|
| Input voltage | AC 220V (±10%), 50/60Hz (±2Hz) |
| No-load voltage | ≥15000V |
| Short-circuit current | ≥50mA |
| Locating ratio precision | ±(0.2%·L±1) m |
The instrument is based on the Murray bridge. The distances from the two ends of the tested cable to the breakdown point are L1 and L2, the total cable length is L, and the corresponding conductor resistances are R1 and R2. After the cable is connected to the bridge, a balanced circuit is formed; with r1 + r2 = r0, the balance condition gives L1 = P‰·L, where P is the balance adjustment reading.
Instrument Panel Layout| No. | Control | Function |
|---|---|---|
| 1 | Power socket | AC 220V connection for the instrument working power supply |
| 2 | Fuse holder | Housing for the AC 220V power supply fuse |
| 3 | Ammeter | Indicates the output current (mA) |
| 4 | Voltmeter | Indicates the high-voltage output (kV) |
| 5 | High-voltage indicator | Lights when high voltage is output; when the key is pressed there is no high-voltage output and the light goes out |
| 6 | Power switch | Position "I" turns on the AC 220V supply; position "0" turns off the system power |
| 7 | Voltage adjustment | After starting, first turn this knob fully counter-clockwise; when the high-voltage indicator lights, turn clockwise to raise the output voltage from low to high and counter-clockwise to lower it |
| 8 | Zero adjustment | Rotate the zero knob to make the galvanometer read zero |
| 9 | Balance adjustment | Adjust the balance knob until the galvanometer clearly deflects and reads zero (if the pointer is to the left turn clockwise, if to the right turn counter-clockwise); record the reading P1 |
| 10 | Magnification adjustment | Counter-clockwise reduces the magnification; clockwise increases it |
| 11 | Galvanometer | Electrical balance, zero adjustable |
| 12 | C1P1 | Connect the reference phase (red clip) |
| 13 | C2P2 | Connect the fault phase (black clip) |
| 14 | Grounding post | Grounding point of the instrument for safety protection |
| Item | Quantity |
|---|---|
| Main unit | 1 |
| Output line | 2 |
| Power line | 1 |
| Ground line | 1 |
| Short-circuit line | 1 |
The instrument is repaired free of charge within one year from the date of purchase for quality problems, and repair and technical service are provided for life. If the instrument is found to be abnormal or faulty, please contact us so that we can arrange the most convenient and effective solution for you.
Mailing address: Building B8-01, Phase I, Ronghao Industrial City, No. 2098 Weiyang 9th Road, Gaoling District, Xi'an, China.
Consignee: Xi'an Xuzhihui Electromechanical Technology Co., Ltd.
Service telephone: 400-029-0829
It locates the breakdown points of laid cables as well as defect points that have not yet broken down but show an abnormally low insulation resistance. It is especially effective for high-resistance linear breakdown points that are difficult to burn into low resistance (such as a linear high-resistance breakdown at a cable intermediate joint), flashover-type breakdown points, and low-resistance insulation defects that do not break down under operating voltage. It is also used inside cable factories for defect-point location.
Compared with the wave-reflection method, the bridge-balance method has no blind zone. It is especially suitable for judging short cables and breakdown points close to the cable ends. The locating ratio precision is ±(0.2%·L±1) m, where L is the cable length.
The high-voltage constant-current source provides a no-load voltage of ≥15000V and a short-circuit current of ≥50mA. The instrument is powered by AC 220V (±10%), 50/60Hz (±2Hz), and the test voltage must never exceed 15kV.
At least two people must be present: one connects the wiring and the other checks it, and the test starts only after the connection is confirmed correct. The panel knobs stay at low potential and the bridge is operated through an insulated rod, and the cable is reliably grounded through a braided shielding layer. During and after the test, discharge before touching any high-voltage part, and always use a reliable dedicated grounding line.
The packing list is: main unit *1, output line *2, power line *1, ground line *1 and short-circuit line *1. The instrument is repaired free of charge within one year of purchase for quality problems, and repair and technical service are provided for life.
Company Details
Business Type:
Manufacturer
Year Established:
2013
Total Annual:
1000000-5000000
Employee Number:
50~100
Ecer Certification：
Verified Supplier
Xi'an Xu&Hui Electromechanical Technology Co., Ltd. /Xian XZH Electric Power Technology Co., Ltd. Has found in 2013, located in Xi'an, China. which is a highly experienced team dedicated to developing electrical... Xi'an Xu&Hui Electromechanical Technology Co., Ltd. /Xian XZH Electric Power Technology Co., Ltd. Has found in 2013, located in Xi'an, China. which is a highly experienced team dedicated to developing electrical...
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