Portable DC grounding fault detector DYDF-850

1、 Product Overview

DYDF-850 portable DC grounding tester is a new generation of DC grounding fault tester. It can be applied to any voltage level DC system, equipped with high-precision detection clamp, which greatly improves the detection range and anti-interference capability through efficient processing of multiple signals; Excellent algorithm and advanced fuzzy control calculation theory are used to express the superiority of the detected insulation branch in numerical form, which fully reflects the superiority of artificial intelligence; For the determination of the position of the grounding point, they have accurate judgment, and each detection can point out the position and direction of the grounding point.

The device takes the system safety as the primary premise, according to the highest requirements of the industry standard, detects in a reliable low-frequency signal way, and has carried out a large number of practical applications on the site, without any impact on the system.

The DC system of power plants and substations provides power for control, protection, signal and automatic devices. The safe and continuous operation of the DC system is of great importance to ensure power generation and supply. As the DC system is an ungrounded floating system, if two points are grounded, the above devices may misoperate and refuse to operate, resulting in serious accidents. Therefore, in case of one point grounding, the grounding point should be detected accurately and quickly while ensuring the normal power supply of the DC system to eliminate the grounding fault, so as to avoid the possible harm caused by two-point grounding.

DYDF-850 portable DC grounding detector is used to find the accurate position of the DC system grounding point of power plants and substations under the condition of no power supply. All types of grounding faults can be quickly found out, with an accuracy rate of 100%.

Compared with similar instruments at home and abroad, this instrument has the following advantages:

1. Easy to use. The instrument can be directly used by turning on the power switch without any other key operation.

2. Safe and reliable. This instrument does not need to stop the floating charger and all other power supplies, and has no impact on the DC system.

3. It is applicable to many voltage levels. DC system 220V, 110V, 48V and 24V can be used.

4. Wide application scope. Any type of power plant, substation, coal mine, chemical plant and other power supply departments can use it.

5. It is convenient to carry. The signal receiver has its own battery, and no external power supply is required. You can carry it anywhere to find the grounding point.

6. The DC system will not affect the normal operation of the system without power supply to find the grounding point.

7. It has strong anti-interference ability and overcomes the influence of system distributed capacitance.

8. Intelligent charging management reduces charging time and extends battery life.

2、 Technical indicators

1. Signal generator

 Output signal frequency: 2.5Hz

 Signal no-load output voltage: ± 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 fuse: 200mA

 Maximum power: 3W

 Volume: 300mm × 270mm × 200mm

2. Signal receiver

 Signal current detection sensitivity: 0.5mA

 Signal generator impedance: 40K

 Maximum output current: 2.5 mA

 Receiver display: digits 0-19

 Volume: 210mm × 100mm × 32mm

 A jaw size: Φ 50mm

 B jaw size: Φ 7mm × 9mm

3. Complete machine

 Maximum grounding resistance detected: 300K Ω

 Maximum capacitance detected: 20 μ F

 Measurement accuracy of grounding resistance: 0-4.5K Ω Error ≤ 0.5K Ω

 Detection range of grounding capacitance: 3-60uF

 Measurement accuracy of grounding capacitance: 3-10uF error ≤ 1uF