About the ZDT-300
The DC system is an important part of electrical power installations, any earth faults can affect the operation of vital components, such as the system protection, circuit breakers and communication equipment. Therefore, its correct operation is vital to the stability of the network.
As the DC system is a floating unearthed system, an earth fault on one terminal will not prevent the system from working normally. However, should an earth fault occur simultaneously on the other terminal, it will result in a virtual short-circuit between them through the earth, causing the failure of the DC supply.
The ZDT-300 DC Earth Fault Locator is used to quickly and accurately locate DC network earth faults on live systems. It consists of a signal transmitter, receiver and a choice of sensors for different cable sizes. Depending on the model chosen, the system is capable of detecting high resistance faults up to 1MΩ, allowing problems to be identified at an early stage, so that remedial action can be taken to prevent a subsequent failure.
Photos
Key features
- Detection of DC network earth faults on a live system
- Automatic identification of positive and negative DC bus voltages
- Detection of AC interference on the battery system
- Measurement of fault resistance, capacitance to earth, and balance resistance
- Transmitter power is taken directly from the system; an external supply is only required if the system voltage is too low
- High sensitivity — up to 1MΩ (1000V version), 500kΩ (500V version), 250kΩ (2500V version)
- Wireless communication technology provides real-time data transmission between the transmitter and receiver, conveniently and quickly
- Inductive sensor available as an alternative to the clamp for large diameter cables
Detailed specifications
General
- Application to DC system voltage level: 24V, 48V, 110V, 220V
- Maximum distributed capacitance value to earth: branch ≤47uF, total ≤150uF
- Earth resistance range: 0-1MΩ (depending on version selected)
Environmental
- Temperature -10oC to +50oC
- Humidity 5-90% RH
- Ingress protection IP54
Transmitter
- Output voltage: 1000V, 500V or 250V (depending on version selected)
- Output frequency: 0.1 – 0.5Hz (automatically determined)
- Power supply: DC（220V/110V）or AC 220V
- Dimension: 195mm×112mm×65mm, weight: 0.80kg
Receiver
- Power supply: 7.2V rechargeable lithium battery, up to 20 hours continuous operation
- Dimension: 195mm×112mm×45mm, weight: 0.55kg
Clamp
- Power supply: 2×AA battery, up to 20 hours continuous operation
- Dimension: 180mm×60mm×35mm; Weight: 0.21kg
Current sensor
- Replaces the current clamp for large diameter cables
- Connects directly to the receiver
- Dimension: 130mm×180mm×30mm; Weight: 0.20kg
