Telecom PTC Thermistor Description
This series of ceramic PTC (positive temperature coefficient ) thermistors help provide protection against power cross, power induction surges and lighting surge defined in ITU, Telcordia, UL. Available in chip, radial-leaded coated and non-coated, SMD, twin vertical surface mount configuration. PTC thermistor overcurrent protector provides reversible, self-resetting protection against over-currents of telecommunication line protector units, improve the reliability of custom premises and network equipment.
Ceramic PTC thermistors can be found providing re-settable line protection at the exchange, monitoring hot spots and protecting ringers, battery feeds, transformers and relay circuits. Also used extensively to protect the mobile phone's battery pack against overcharging in land-based and radio mobile communications.
Advanced developments in telecom equipment in recent years have radically altered the protection requirements of both exchange and subscriber equipment. The PTC thermistor must protect the telephone line circuit against overcurrent, which may be caused by the following examples:
Surges due to lighting strikes on or near to the line plant.
Short-term induction of alternating voltage from adjactent power lines or railway systems, usually caused when these lines or systems develop faults
Direct contact between telephone lines and power lines.
To provide good protection under such conditions, a PTC thermistor is connected in series with each line, usually as secondary protection; However, even with primary line protection (usually a gas discharge tube), the PTC thermistor must fulfill severe requirements.
Surge pulses of upto 2KV can occur and in order to withstand short term power induction, the PTC thermistor must withstand high voltages. If the line has primary protection, a 220V to 300V PTC thermistor is adequate. Without primary protection, 600V PTC device is necessary. We can manufacture a series of PTC thermistor fulfilling both requirements.
Typical Application of PTC Thermistor in Telecommunication Protection
Central Office Switching Equipment (C.O), analog and digital line cards, T1/E1 equipment, xDSL modems and splitters, multiplexers, CSU/DSU, servers.
Primary Protection Modules, MDF (main distribution frame) modules, network interface devices (NIC).
Custom Premises Equipment, also known as subscriber terminal equipment (T.E.), IT equipment: Modem, phone sets, fax machines, phone wall outlet (plugs), alarm systems, answering machine, PBX systems, ADSL Splitters, internet appliance, POS terminals.
Access Network hardware, LAN WAN equipment, Powered Ethernet systems, VoIP (voice over IP equipment), Set-top box (S.B), etc.
Telecom PTC Thermistor Features
Compliant with ITU-T K20 K21 K45
Basic level lightning surges (10/700ª¦s)
Basic level power Induction (600V,1A,0.2S)
Power contact criteria A/B (230V,15min.)
Suitable for continuous connection to main voltage 110/230 VAC in tripped (high ohmic) condition.
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SANDI SERIES charging module is for electric vehicle charging station. With single-phase non neutral conductor AC input, it has the advantages of high efficiency, high power density and low harmonic. Functional details 1. Hot plug Plug technology is applied to the charging module to provide convenience for installation and maintenance. The access of the charging module to the system shall not disturb the output voltage of the system. 2. Advanced current sharing technology Under constant voltage working mode, the charging modules can share current automatically within 10S, with degree of unbalance less than �±0.5A. 3. Control of input limited power Refer to Fig. 1-10 for the relation between the output power and input voltage of the charging module. When the input voltage is within 360 Vac ~ 450 Vac (return difference is less than 5V), the module can output the maximum power of 20 KW; when the input voltage is within 260 Vac ~ 320 Vac, the module can still work normally under limited power mode. 4. Control of output constant power When there is a rated input voltage, the output power of the module is 20 KW. Refer to Fig. 11 for the relation between the output voltage and the output current of the module. The SD75050 module uses two operating modes with output voltage ranges of 50 to 750V. The module only selects the operating mode based on the value of the received demand voltage, and does not select the operating mode based on the actual output voltage. 5. Temperature limited power 6. Regulation of output current limiting point 8. Regulation of output voltage The output voltage of the module can be regulated constantly through the external monitoring module, with regulation range of 50Vdc ~ 750Vdc and minimum regulation step of 0.1 Vdc. 9. Fan control The built-in processor of the module can regulate the speed of the fan according to the internal temperature and output current of the module. 10. Protection of input overvoltage/ voltage shortage 11. Output overvoltage protection The overvoltage protection point is 260Vdc ~770Vdc (�±10 Vdc). Default is 778Vdc.The module can be started after manual intervention upon overvoltage protection. 12. Over-temperature protection The environmental over-temperature protection point is 80�°C. When the DC panel has a temperature over 100�°C, the module will stop working; when the DC panel has a temperature below 90�°C, the module will automatically work again. 13. Protection of internal bus fault When the internal bus voltage of the module is beyond the overvoltage/ voltage shortage protection point, the module will be powered off automatically. At this time, there is no output from the module and the fault indicator light is on. 14. Short circuit protection In case of short circuit of the module, it will be subjected to protective shutdown and the red indicator light of the panel is on, and this condition will be transmitted to the monitor of the "module fault".
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Liquid Cooled Charging Cables are electric vehicle charging cables that utilize liquid cooling to achieve high-speed charging. These cables feature a 500A current rating and a 1000V voltage rating for charging speeds up to 500KW.
Application :- The XLPE (Cross Link Poly Ethylene) Power Cables are used under ground as well as over head transmission of power in power plants, industries, projects and all other electrical installations. Features :- Manufactured from bright annealed 99.97% pure bare copper & aluminum conductors. These cables are insulated with XLPE compound. Taped/Extruded inner sheath. Round steel wire / flat galvanised steel grip armoured. The outer sheaths can be PVC, HR PVC, FRLS or FR depending upon the application and requirement. Technical Advantage of XLPE Insulation :- Higher current rating, higher short circuit rating (approx 1.2 times that of PVC), thermosetting in nature, higher insulation resistance (1000 times more than PVC cables), higher moisture resistance, better resistance to surge currents, low dielectric losses, better resistance to chemicals and corrosion, longer service life. Comparatively higher cable operating temperature 90�°C and short circuit temperature 250�°C. Technical Data :- Working Voltage : Up to 1100 V Temperature Range : -15�°C to +90�°C Power Cable Sizes : 1.50 Sq. mm to 400.00 Sq. mm in 2, 3, 3 Copper Control Cable Sizes : 1.50 Sq. mm, 2.50 Sq. mm up to 24 cores. Color Codes : 2 Core Cables - Red, Black 3 Core Cables - Red, Yellow & Blue 3 Core Cables - Red, Yellow, Blue & Black (for Neutral) 4 Core Cables - Red, Yellow, Blue & Black 5 Core Cables - Red, Yellow, Blue, Black & Grey 6 Core Cables & above - Adjacent cores are blue for reference and yellow for direction in each lay Black outer sheath Specification : IS:7098 (Part-1) Packing : 500 / 1000 meters on drums
