Product Introduction
Wuhan UHV Power Technology Co.,Ltd., is a professional manufacturer and supplier of high-voltage power testing equipment in China.DC system grounding fault tester produced by Wuhan UHV is a new generation of tester. It can be applied to dc systems of any voltage grade. It is equipped with high-precision detection clamp table, which greatly improves the detection range and anti-interference ability through efficient processing of multiple signals. Advanced algorithm and fuzzy control theory are adopted to express the superiority degree of detected insulation branch in numerical form, which fully reflects the superiority of artificial intelligence. They have accurate judgment on the location of the grounding point, and can point out the location and direction of the grounding point every time.
DC system grounding fault tester takes system safety as the primary premise, conducts detection in a reliable low-frequency signal in strict accordance with the requirements of industry standards, and carries out a large number of practical applications in the field, without any impact on the system.
Dc systems in power plants and substations provide power supply for control, protection, signals and automatic devices. The safe and continuous operation of dc systems is of great importance to ensure power supply and distribution. As the dc system is not grounded by floating system, if two-point grounding occurs, it may cause the above devices to misoperate and refuse to operate, thus causing a major accident. Therefore, when one point grounding occurs, the grounding point should be accurately and quickly detected while ensuring the normal power supply of the dc system to eliminate the grounding fault, so as to avoid the possible harm of two points grounding.
DC system grounding fault tester is used to find the exact location of DC system grounding points of power plants and substations in the case of constant electricity. All kinds of grounding faults can be found out quickly with good accuracy.
 |  |
Product Features
1. Easy to use. The DC grounding finder can be used directly by turning on the power switch without any other key operation.
2. Safe and reliable, the DC grounding finder does not need to stop the floating charger and all other power sources, and has no impact on the DC system.
3. There are many applicable voltage levels. DC systems 220V, 110V, 48V, 24V can be used.
4. Wide range of application, can be used by any type of power supply department such as power plants, substations, coal mines, chemical plants
5, easy to carry, the signal receiver comes with a battery, no external power supply, you can carry it anywhere to find the ground point
6. The DC system continuously searches for the ground point without affecting the normal work of the system.
7, strong anti-interference ability, overcome the influence of system distributed capacitance
8. Intelligent charging management, reducing charging time and extending battery life
Product Parameters
| Signal generator | output signal frequency | 2.5Hz |
| signal no-load output voltagee | ±20V±5% | |
| signal voltage amplitude error | <5% | |
| signal short circuit output current | ≤80mA | |
| impact resistance of output port | 400V dc impact | |
| power supply voltage | AC220V±10% | |
| voltage frequency | 50Hz±5% | |
| input insurance | 200mA | |
| maximum power | 3W | |
| volume | 300×270×200mm3 | |
| Signal receiver | signal current detection sensitivity | 0.5mA |
| signal generator impedance | 40KΩ | |
| maximum output current | 2.5 mA | |
| receiver displays | digits0～19 | |
| volume | 210×100×32mm3 | |
| aclamp size | Φ50mm | |
| bclamp size | Φ7mm×9mm | |
| Complete machine | detection maximum ground resistance | 300kΩ |
| ground resistance measurement accuracy | 0～4.5kΩ，error≤0.5kΩ 4.5kΩ～300kΩ，error≤10% | |
| External dimension（ mainframe） | 340*290*140mm3 | |
| Weight （ mainframe） | 3.96kg | |
| External dimension | 390*290*140mm3 | |
| Weight | 2.8kg | |
Application Scenarios
Substations
Used for grounding fault location in DC circuits such as DC panels, protection, control, and signaling systems — this is the core application scenario.
Power plants
Troubleshoots insulation degradation and grounding issues in DC circuits of generator sets, protection systems, and control systems.
Power operation & maintenance / electrical testing companies
Used as an on-site fault diagnosis tool to help engineers quickly locate the specific faulty branch.
Coal mines
Used for grounding fault detection in DC control, protection, and automation systems in mining operations.
Chemical / petrochemical plants
Suitable for industrial control and protection systems that cannot be easily shut down, particularly ideal for online fault diagnosis.
Other potential markets
Railways / subways, communication rooms, data centers, UPS, ships, and other facilities with corresponding DC systems all have potential demand, but further confirmation of on-site voltage, standards, and certifications is required.
Frequently Asked Questions
Q:Why should I choose an online DC ground fault locator instead of shutting down the system for troubleshooting?
A:Shutting down a critical DC system may interrupt protection, control and monitoring functions. PDF1000 enables maintenance personnel to troubleshoot ground faults while the system remains energized, helping reduce downtime, improve maintenance efficiency and minimize operational risks.
Q: Is PDF1000 suitable for both routine maintenance and emergency troubleshooting?
A: Yes. PDF1000 can be used for both routine inspection and preventive maintenance as well as rapid troubleshooting after a DC ground fault alarm.
Q:Why do I need a DC ground fault locator?
A:A DC ground fault may not immediately interrupt system operation, but it can increase the risk of protection or control system malfunction. PDF1000 helps maintenance personnel locate the faulty circuit before the problem develops into a more serious failure.
Q:Why is online fault location important?
A:In substations, power plants and industrial facilities, shutting down a DC system may interrupt critical protection, control or monitoring functions. Online fault location can significantly reduce troubleshooting time and minimize operational disruption.
