Field of the Invention
The present invention relates to a telecom utility manager for providing AC and uninterrupted DC power to a power utility system. The telecom utility manager having a voltage conditioning device, surge protection devices, AMF control, ability to deliver the integrated AC power and DC power to the system, BTS and battery load for flawless and uninterrupted operation of the telecom equipment.
Background of the Invention
Telecom site requires various functions, protections, operations with power, and requires AC as well as DC power feed to various Loads. The unit should be highly efficient, emitting lesser heat, and able to work in outdoor air-cooled environment. With growing demand of telecom customers, it is essentially required to add more and more sites to the network. At the same time, mobile telecom companies had to offer low rates and tariffs to attract and maintain the customer base. Thus it becomes essential, that the cost of infrastructure must be kept as low as possible, as well as the running cost of the system must be as minimum as possible. It enhances the need of compact and smaller systems required at site as well as the complete automation and automatic protection systems employed. In earlier days prior to the entry of private mobile operators, the basic Dot exchanges were situated in centralized spacious buildings. With the entry of mobiles and a number of sites growing up due to large customer base, it became mandatory to squeeze the required space, due to high rising costs of space and operation in prime locations.
The present invention telecom utility manager is especially designed to provide complete solution for AC and DC power need at any typical telecom site. All other present day contemporaries manufacture Power Interface systems with two or more than two micro controllers. With such products from other manufacturers, one micro controller is used for annunciation / monitoring, and another micro controllers are dedicated only to static voltage regulator (SVR) functions and so on. In other words it is mere hardwiring of the individual entities, rather than a single master controlling the entire equipment. In true sense, such systems are never capable of performing as a whole unit. Each and individual

micro-controller performs its predefined tasks, and had to wait for the information from the other micro-controllers. It unnecessarily adds up the delay, in the operation of whole system. The present invented system is equipped with single micro-computer unit, which is responsible entirely for all the tasks, associated with the system. The firmware architecture and software of the system had been specially coded to meet the specific requirement. All the data is processed and operated by the same unit, at the same time controlling the operation. The whole operation is defined in terms of various tasks, based on the level of their criticality of nature. Those tasks are performed in repetition, at a time interval, defined according to their priority. It provides the ease of data-processing, avoiding the unnecessary delays, and performing the operation at faster rate at the same time.
Objects of the Invention
It is the principal object of present invention to provide a telecom utility manager for providing AC and uninterrupted DC power to a power utility system.
It is another object of this invention to provide monitoring and controlling of all devices of the telecom utility manager by a single micro- controller, for AC output power.
It is yet another object of the invention to provide a lightening arrestor device for arresting the lightening strikes traveling over the incoming mains AC supply.
It is a further object of the invention to provide a phase selection device for selecting the phases with predetermined characteristics of AC power received through the said lighting arrestor device.
It is still another object of the invention to provide a voltage regulating device for conditioning and regulating the voltage of selected phases.

It is still another object of the invention to provide a distribution panel for distributing the regulated voltage power.
Still another object of the invention is to provide a surge arrestor with decoupling inductor for arresting voltage surges from the AC power received from distribution panel.
It is a further object of the invention to provide a rectifying device for rectifying the AC power.
It is a yet another object of the invention to provide a power generating set coupled with auto start device for generating AC power in event of failure of mains AC supply
It is another object of this invention to provide a battery bank to supply uninterrupted DC power coupled with battery charger device.
Still another object of the invention is to provide automatic monitoring and extension of alarms.
It is an object of the invention to provide zero-cross detector at final driver stage, to ensure the minimum distortion / noise to the power line, and increasing the overall reliability of the system
It is still another object of the invention to provide a unique V-wiring to connect the lightening arrestor device and surge arrestor device.
These and other objects of the present invention will become readily apparent upon further review of the following specification and drawings.
Statement of the invention
According to the present invention there is provided a telecom utility manager for providing AC and

uninterrupted DC power to a power utility system, said system containing telecommunication equipment of a base station, said telecom utility manager comprising:
a lightening arrestor device for arresting the lightening strikes traveling over the incoming mains AC
supply;
a phase selection device for selecting the phases with predetermined characteristics of AC power received through the said lighting arrestor device;
a voltage regulating device for conditioning and regulating the voltage of the said selected phases;
a distribution panel for distributing the said regulated voltage power ;
a surge arrestor with decoupling inductor for arresting voltage surges from the said regulated voltage power;
rectifying device for rectifying the power received from the said surge arrestor;
a power generating set coupled with auto start device for generating AC power in event of failure of mains AC supply; and
a battery bank to supply uninterrupted DC power coupled with battery charger device,
characterized in that the functions of said devices are monitored and controlled by a single microcontroller for supplying AC output power.
Brief description of accompanying drawings

Figure 1 shows the arrangement of various devices of the telecom utility manager. Detailed description of the Invention
Figure 1 describes the arrangement of various devices of the telecom utility manager. Telecom utility manager comprises a phase selection device (1), lightening arrestor device (2), a static voltage regulating (SVR) device(3), an AC distribution panel (5), a surge arrestor (6), rectifying device (8), a power generating set/DG set (11), auto start device (7) and a battery bank. All the devices of telecom utility manager are monitored and controlled by a single micro-controller/program manager for supplying AC output power. The whole system is enclosed in a rack of 2000mm height with footprint area of 600x550mm. The system is modular in design and Rectifier Power Rack, SVR systems are swappable by design. In Phase selector device (1), three phase - four wire supply is fed to the power controller section of the phase selector. The three phase voltage with respect to neutral is sensed by the analog to digital section of the program manager. The program manager reads and compares the actual voltage with set low and high voltage limits, and decided the phase selection. The selected phases to the auxiliary power supply are fed through the control relay on the power card. Once the auxiliary supply is established, the next stage of phase selection is initialized and the power contactors are switched on. The two available healthy phases selected are pass on to the next stage of the system. The SVR (3) is at the next stage to the phase selector (1) in the electrical line, thus fed with the two selected phases. Static voltage regulator (3) is modular in design and assembled in the power configuration of 5kVA, 7.5kVA, lOkVA, 12.5kVA and 15kVA. This is static type of voltage corrector and regulates the voltage by the selection of solid state device in close control loop. This tap change operation is directly monitored and controlled by the program manager. This voltage regulator is very precise in operation and takes care of voltage and current shoot, by virtue of protection of zero cross over switching of voltage and current. The system supports the standard band of 240-480Vac of phase to phase input and regulates it in the output band of 200-240Vac. The design is customized and the ranges can be adjusted

accordingly. The change over of selection of thyristors at zero cross over means that the change over of thyristor switching must be carried out at the zero instant of sine wave. It ensures that no overshoot or spike is created in either current or voltage wave of the line. The system achieves the same objective with the combination of one dedicated chip for zero cross-over detection at the final selection of thyristor and the intelligence of program manager. It reduces the voltage shoots, current shoots, smoothens the wave shape, limits the distortion, and controls the dv/dt across the solid state devices, thus safe-guarding the components. Auto start device/auto mains failure(AMF) (7), is third stage of the telecom utility manager, dealing with the flow of power control. The AMF is controlled by the program manager. It consists of power contactors, which routes the flow of power either from DG set (11) or from SVR (3) section as directed by the program manager. In case of mains, the phase selector (1) switches two healthy phases to the SVR (3), the SVR(3) regulates the power and feeds to the AMF (7), the AMF (7) routes the power to the o/p AC distribution nodes (5). In case of mains failure, if the DG set (11) is switched on, the DG power comes to the AMF (7) and routed to the o/p distribution. AC distribution (ACDB) panel (5) is the o/p distribution node for the AC power o/p from the system. System provides one or two AC distribution (ACDB) panels depending upon the configuration of the system. System with one SVR (3) provides one ACDB node, while system with two SVR (3) provides two ACDB nodes. This system never synchronized the two different power output of two SVR's. Both of the two power output from the two different SVR,s are distributed to different loads separately. ACDB is also composed of o/p neutral panel, which provides the neutral return path for the AC loads for the SVR,s. Class B is the lightening arrestor (2) connected to the input of the system. This is connected for the protection from the conducted surges coming in the power line. The class B (2) system is connected in parallel to the incoming feeder in V-wiring pattern. V wiring ensures that no power cycle goes to system, without traveling through the arrestor. Each and every cycle is routed through the attestors. Class C is the surge arrestor (6), connected at the final output of the system. This is connected in parallel to the output at the ACDB (5), ensures the suppression of the conducted surges and spikes traveling through the power line. This is also connected in the V wiring pattern, which ensures that no transient and spikes travels to the o/p ACDB (5). This system is integrated with

lightening arrestor (2) system for the strikes traveling over mains incomer, and coupled with surge arrestors (6) at much later stage, with decoupling inductor. After lightening arrestors (2), power travels to the phase selector section, and program manager/microcontroller routes the power through appropriate section by interrupting the unhealthy phase and allowing the required phases. This power is fed to SVRs (3) for conditioning and conditioned power is distributed to AC distribution panel (5), with surge arrestors (6) in V-wiring fashion. The same conditioned power is fed to power rectifier shelves (8), which delivers high quality DC power to the DC distribution nodes (9, 10). Alternatively system takes the power from single phase DG set (11), and routes it to power circuit, if program manager ensures DG operation, in case of proper logic and operational flow matched.
The system may be understood as an advance interface system, being processed operated, and controlled by a specific program manager. The microcontroller, working as program manager, fetches all the analog and digital inputs, process the raw data, and releases the control command to various sections. It operates and controls the whole system, based on the predefined priority level of the tasks. The tasks are defined according to their level of criticality of nature. Tasks are embedded in a universal time scheduler, which ensures the operation of all the tasks, at a repeated frequency. At the same time, various typical incidents have been identified, which are served on priority as and when they arise.
The program manager controls PSU (1), SVR (3), a power generating set/DG set (11), auto start device (7) and alarm logging and data transfer device under its direct control. Also the program manager is able to take care of local monitoring through RS232 port,digital display(LCD and LED), local key pad,individual LED (for alarms/status),and remote monitoring through NMS / Webportal. In addition to the above stated devices, Class B, lightening protection device (2), Class C, surge arrestor device (6) and DC power system (8) are the hardware utilities associated with the system, which works without the need of control from program manager. The various tasks performed by these devices of telecom utility manager may be enlisted as below.

1. Lightening protection The objective of the device (2) is to provide protection from the direct lightening strike traveling through the power feeding wires or cables. These devices are employed at each phase as well as neutral wire, and release all the excess energy above threshold to the local ground feeder.
2. Phase monitoring, and dual healthy phase selection (required for 3 phase in to 1 phase out applications).
The device scans all the three phases. For 3 phase out requirements ,the output is disabled if input AC three phase voltage is beyond the specified limit. The system scans all the three phases and checks for the voltage of the individual phases, and selects any two phases, within defined voltage limits. The selected phase voltages are fed to the next stage for static voltage conditioning. This scheme is used where desired output is 1 phase
3. Voltage conditioning (3) The available power in wider band is controlled and allowed to next stage in smaller and permitted narrow band, through static tap changers ((Silicon controlled rectifier (SCRs)/ Insulated gate bipolar transistor (IGBT )) at power transformer. This control is directly carried out by the program manager/ controller.
4. Class C , surge protection device (6) The objective of this device is to kill the local surges and transients, produced due to operation. It ensures clean power for the utility mains.
5. AC power distribution (5) AC power distribution section consists of multiple circuit breakers, and is customized as per the specific requirements, meeting the load condition of the sites.

6. Air-conditioner control and management
The system takes over the complete control of air-conditioners, so as to control the temperature of ambient, and ensuring the minimum use of air-conditioners at the same time. It operates the air-conditioners according to the required set temperature and the actual temperature of ambient.
7. DC power generation (8) The system is equipped with the best in its class, highest power density SMPS based FlatPack2 series DC power system. It is loaded with the entire advance feature of any available DC power system of its class. The system is preloaded with the following features.
7a. DC power distribution
7b. Low voltage Disconnect (LVD) protection
7c. Battery charging current limiting
7d. Alarm monitoring, acquisition and retrieve system
8. DG set controlling (11), auto start (7) and stop operation
The system controls the DG set, and operates it based on the following two parameters.
8 a. Temperature of ambient 8b. BTS battery voltage level
The system scans various parameters in continuous manner. In case of mains failure, fans(for external coolant) are started and system keeps close monitoring on temperature and BTS battery voltage level. The DG set is started, if any of the condition occurs, out of both.
8c. Temperature is higher than set limit

8d. BTS battery voltage equals to the set low voltage limit
Once the DG set is started, and proper output obtained from the source, then the load is transferred, to the DG set, and the fans(used for external coolant) are switched off. Now if the AC mains is restored, the system scans for the stability of mains for some defined time, and then makes the change over of the load and then switch off the DG set after predefined cooling time of DG set on no load. The system has following more features for the DG set operation.
8e. DG non stop run hours
If the AC mains is not restored for a long time, DG set is kept running continuously, but it can't be operated for prolonged hours, thus to safeguard it from long continuous operation, user can set the number of hours, for which DG set is to be operated in non-stop manner. Once the BTS battery set low voltage level event is encountered, the DG set is switched ON, and after charging the BTS battery for set non-stop run hours count the DG is switched off, and the system returns to BTS battery mode. Again DG set is switched on, if BTS battery low level is encountered again.
8f. DG Rest Hour
This is another feature associated with the DG set operation. This feature is typically helpful, where the mains is not available at all. User can set the DG rest hour, so that the battery is discharged for a certain period, and DG also rests for that time.
With the combined utilization of both features, of DG rest hours and DG non-stop run hours, user can set the charge-discharge cycle of the BTS battery bank, and the DG set operate and rest hour at the same time.
9. Record keeping of hours count of DG and Mains operation

It helps in managing and analyzing the operational cost of the site. User can cross-check the consumption of the fuel of the DG set.
10. Alarm logging, and data retrieve system This feature helps in analyzing the pattern of failure and occurrence of event at any site. The system logs and keeps the event information, with respect to the time and date.
11. Automation system The system provides monitoring and protection from fire and intruder type of conditions. In such case, it carries out the first stage preventive action, and conveys the alarm to the control room.
Program Manager :
The master micro-computer working as program manager, may be treated as chief operating officer of the system, which is solely responsible for all the operation and activities, within and associated with the system. It is basically a mini computer with multiple analog inputs, digital inputs, digital outputs and analog outputs. This mini computer is capable of handling various data at a much higher speed than expected, and can perform various operations simultaneously.
Auto DG Controller system :
This system performs the task of DG automation. The DG set is operated, controlled and monitored for alarms such as HCT/HWT, LLOP, and fuel etc. The DG set is operated with the care of these alarms. It is not switched on, if any of the alarm is raised at DG set. Moreover during continuous operation, the alarms are monitored, and the DG set is switched off, if any of the alarm is raised at DG set. The information of alarm is displayed on the front panel with the help of LED, as well as extended to optical maintenance control (OMC) through Potential free contact (PFC) signals. A record of total

hours of operation of DG is also kept by the system.
AC Power System:
The system provides clean and conditioned AC power for utility application on site. The selected phase-phase power in the range of 240-480Vac (can be customized as per the customer demands) power is fed to the SVR (3), and the conditioned output in the range of 343-419 V ac, (can be customized as per customer demands) is further fed to next stage. The voltage conditioning is obtained through tap changer of power transformer, using static power thyristor /IGBT modules. The thyristors are controlled by the master controller and the feedback voltage is examined by the master controller itself. The switching of the thyristors from one to another is carried out at zero voltage incidents, so as to avoid any malfunction. This is extremely useful in case of inductive and capacitive loads. In practice the AC loads connected to the output of the SVR of unit can have lagging or leading power factors .rather than being purely resistive. Thus it is necessary to have static tap change in the SVR at the zero cross over of the AC input cycle to avoid distortions, kickback and false measurements unto the feedback circuits. All other PIU manufacturers either do not employ this feature of tap change at zero cross over or exploit it with first aid , laboratory prototypes , which don't tend to be reliable under all operating conditions. The system uses a special chip in the ultimate driver stage of the static devices of the SVR . This is the most reliable combination, as zero cross over ,static tap change over is ensured under all operating conditions ,due to use of zero cross over coupler in the final stage of the static driver. The chosen zero cross over configuration thus increases the over all reliability of the system.
DC Power System :
The newly developed, highest power density is integrated in the system, to fulfill the need of DC power requirement at telecom. The DC power system comes with the following features.
1. Highest power density, thus lesser cabinets and less footprint in the location.

2. Easier to handle for
Maintenance Staff - Especially as spares Logistics - Lighter weight means less shipping costs
3. 2 Fans - Front to back airflow Gives a high rectifier efficiency
4. 2 Digital controllers: Gives more monitoring and control information Giving operators more real-time system information
Helps maintenance staff know exactly what needs to be done
5. Edge-connector technology
Provides for quick hot-swapping of modules Reduces interconnect failures
The rectifying device is SMPS rectifier operable to deliver DC power to telecom equipment, wherein rectifier is under the control of two microcontrollers, first for controlling and monitoring the conversion of AC to DC and second for controlling and monitoring the conversion of said high voltage DC to DC of required voltage. Communication between Controller and rectifiers modules is through Controller Area Network Bus.

We Claim:
1. A telecom utility manager for providing AC and uninterrupted DC power to a power utility system, said system containing telecommunication equipment of a base station, said telecom utility manager comprising:
a lightening arrestor device for arresting the lightening strikes traveling over the incoming mains AC supply;
a phase selection device for selecting the phases with predetermined characteristics of AC power received through the said lighting arrestor device;
a voltage regulating device for conditioning and regulating the voltage of the said selected phases;
a distribution panel for distributing the said regulated voltage power ;
a surge arrestor with decoupling inductor for arresting voltage surges from the said regulated voltage power.
rectifying device for rectifying the power received from the said surge arrestor;
a power generating set coupled with auto start device for generating AC power in event of failure of mains AC supply; and
a battery bank to supply uninterrupted DC power coupled with battery charger device,

characterized in that the functions of said devices are monitored and controlled by a single microcontroller for supplying AC output power.
2. The telecom utility manager as claimed in claim 1 wherein said microcontroller is configured to operate and control the said system based on predefined priority levels of the said telecommunication equipments.
3. The telecom utility manager as claimed in claim 1 wherein said voltage regulating device comprises power thyristors or IGBT for voltage conditioning.
4. The telecom utility manager as claimed in claim 3 wherein said voltage regulating device comprises a zero-cross over detector, said detector provided at output driver stage of said static voltage regulator to ensure static tap change of the said thyristor.
5. The telecom utility manager as claimed in claim 1, wherein said rectifying device is SMPS rectifier operable to deliver DC power to said telecom equipment, wherein said rectifier is under the control of two microcontrollers, first for controlling and monitoring the conversion of AC to DC and second for controlling and monitoring the conversion of said high voltage DC to DC of required voltage.
6. The telecom utility manager as claimed in claim 1, wherein said auto start device is configured for continuous monitoring of ambient temperature of the said base station and voltage level of the battery and to start the said power generating set when the temperature and/or voltage levels reach predetermined level.
7. The telecom utility manager as claimed in claim 1, wherein said lightening arrestor device and said surge arrestor are connected through with V-wiring.

8. The telecom utility manager as claimed in claim 1, wherein said predetermined characteristics of AC power select the phase within predetermined voltage limit of 140 to 280 volts .
9. The telecom utility manager as claimed in claim 6, wherein said predetermined voltage level to start said power generating set is 20-27 V for 24V applications and 40-54 V for 48 V applications.
10. The telecom utility manager as claimed in claim 6, wherein said predetermined temperature level to start said power generating set is between 28-40 degree Celsius.
11. A telecom utility manager substantially as hereinbefore described with reference to the
accompanying drawings.