DC Current Monitoring System AC Inlet DC Monitor

DC Current Monitoring System AC Inlet DC Monitor


Outline:
      With the popularization of substation intelligence, there is a higher requirement for the reliability of the DC system. There are many factors that affect the stability of the DC system. One of them is the "AC breaks into the DC fault", which results  malfunctions of equipment damage, protection equipment not moving, misoperation, DC grounding, etc. And it has a serious impact on substations safe operation. The "FLD-JZ" series of "AC breaks into DC monitor" can monitor the running status of the DC bus in real time, including: AC inrush, DC voltage and ripple factor, which provides the basis for the overhaul and maintenance of the DC system. It adopts signal isolation, high-speed sampling, AC and DC status analysis, etc., which realizes functions of AC intrusion detection alarm, DC voltage monitoring and ripple measurement, real-time display of current measurement values. When the abnormal situation occurs, it will have sound and light alarm, and provide dry contact output port and RS485 communication port, which uploads the monitoring information to the host computer in real time.

Characteristic:

Real-time monitoring and display whether there is AC intrusion and AC voltage value;Real-time display waveform diagrams of  positive and negative bus voltage to ground;Real-time detection and display DC bus voltage;Real-time detection and display ripple factor of DC power supply;Automatically store, record alarm value and alarm occurrence time;Fault waveform record function: When AC inrush DC system fault occurs, the fault waveform is automatically recorded. The user can analyze whether AC is "positive bus inrush", "negative bus inrush" or "inrush between positive and negative bus";With dry contact output port and RS485 communication port, which can upload monitoring information to the host computer in real time or for other monitoring equipments to collect and system integrate.Optimized circuit and program design, well-selected components, adoption of industrial-grade embedded processor and high-precision, high-speed A/D conversion chip, high measurement accuracy, strong anti-interference ability, high reliability and security, and good self-protection feature;Adopt optical isolation, power isolation, communication port isolation and analog, digital isolation technology, and fully consider the insulation between DC positive& negative bus bars and ground, ensure the instrument's safety, reliability and detection accuracy and without effect on safe operation of DC system;Data collection is fast and accurate, without missing or false collection; AC inlet DC detection: It adopts the capacitor's "separate DC, connect AC" characteristic to separate and extract the AC signal on the DC bus, which conditioned by the conditioning circuit and sent to the high-speed, high-precision A/D conversion chip, transferred to CPU after photoelectric isolation, and then get the measured AC voltage value, and then according to the stated alarm threshold set by user to store, alarm and data upload and other processing;DC voltage and ripple measurement: after differential adjustment to the bus voltage conditioned (the ripple is separated and extracted by the capacitor's "separate DC, connect AC" characteristic), it's sent to a high-speed, high-accuracy A/D conversion chip, which is then transmitted by photoelectric isolation. Into the CPU, and then get the measured DC voltage value and ripple factor (ripple value), then according to the stated alarm threshold set by user to store, alarm and data upload and other processing;4.3-inch full-color touch LCD display, real-time display waveform diagrams of the current positive and negative bus voltage to ground, voltage measurement values, alarm values, and can view the historical records; all Chinese menu operation, easy to use;It has three installation modes: "panel-embedded installation", "back-hanging clip-type installation", and "back-screw installation". The installation and wiring are very convenient.With built-in memory to store alarm information in real time and support power-off preservation;With built-in clock (no influence when device power-off) to record the alarm time in real time.

Technical Parameter:
 

Applied DC system voltage level: DC220V, DC110V, DC48V (other voltage levels can be customized);Working power supply: AC220V, DC220V, DC110V, DC48V;Display,operation interface: 4.3-inch full-color touch LCD display;Measurement Range of Intruded AC voltage: 0 ~ 300V; resolution: 0.1V;Intruded AC voltage measurement accuracy: ±2%;AC inlet DC monitoring reaction time: < 1S;DC voltage measurement range: 0 ~ 300V; resolution : 0.1V;DC voltage measurement accuracy: ± 1%;Waveform diagrams of Positive and Negative Bus-to-Ground Voltage: Display two periodic waveform diagrams and refresh in real time;DC power supply ripple factor: 0 ~ 99.99%;Alarm mode: sound and light alarm, dry contact closure, data upload;Input interface:Working power supply: "L, N, ground" or "KM+, KM-, ground";Signal input: KM+, KM-, signal groundOutput interface:Dry contact without power (always open): 2 groups (contact of AC inlet DC alarm, contact of system fault alarm);Contact capacity of Dry contact relay: AC250V/3A;Communication port: RS485;Data storage capacity: 1000pcs;Overall Dimensions: 

                        Back Installation(back fixed): 143*102*65mm  (W*L*D); 
                        Panel Installation:(front fixed):143*102*60 mm(W*L*D); 
                        160*120mm(Panel)    
                        145*103mm(aperture size)


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Application Industry:

How to choose good battery discharge tester ?

Usually meet necessary points as follows: 

1. Must use PTC heating element to assure low failure rate.

2. Must use constant current discharge mode and can automatic count the battery capacity.

3. Discharge accuracy : ≤±0.5% , discharge current ripple coefficient : ≤±0.1%

4. End condition can choose battery voltage ,discharge current, continuous time and total capacity.  

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