KR100966126B1 - The digital controller pannel - Google Patents

Abstract

PURPOSE: A distributing panel digital controller is provided to improve a lifetime and a power factor of a transformer by improving an unbalance of a load through an uninterruptible power supplying apparatus. CONSTITUTION: A phase power measuring instrument(30) measures amount of a current flowing in from a high voltage panel to a low voltage panel. An integration controller receives a current amount information data through a UTP cable. A user input apparatus establishes a phase unbalance rate standard value. An uninterruptable power supplying apparatus supplies an emergency power in an interruptible according to controlling of the integration controller. The uninterruptable power supplying apparatus supplies the power for compensating phase unbalance when the phase unbalance rate is greater than the standard value.

Description

Switchboard Digital Controller {The digital controller pannel}

The present invention relates to a water substation facility for supplying power by building unit or plant unit by lowering the special high voltage of 6,600V or more and 22,900V class to low pressure of 380V or 220V.

The present invention relates to a closed switchgear, which is divided into a high-voltage board and a low-pressure board according to a system order in a grounded cubicle (excluding metal), a breakdown section automatic switch (LBS), an arrester, a high-pressure fuse, and a transformer for instrumentation. (MOF), transformer (TR), transformer for instrument (PT), transformer for instrument (CT), and storage battery are installed, and the circuit breaker (MCCB), various measuring devices, and digital control device are built in the low pressure plate. Each device is embedded in a unit cubicle to perform its own unique function in an independent space.

The present invention is to solve the problems caused by the load imbalance for each phase (R, S, T) that occurs depending on the use of the load (electric device) when supplying power to the load (electric device) through the switchboard. The present invention relates to improving efficiency by supplementing an unbalanced load with an uninterruptible power supply.

In the three-phase four-wire power supply method, when 220V is supplied to the load through R phase-N phase, S phase-N phase, and T phase-N phase, there is a difference in load amount by phase depending on the use of power by load. In this case, the power factor is lowered, and a partial overload condition is caused in each phase winding of the power supply transformer, thereby causing a problem such that the power supply transformer is burned out.

Therefore, if the load unbalance rate is measured and unbalanced above the set value, it is possible to prevent the power factor drop and burnout of the power supply transformer by performing maintenance work for correcting. The load unbalance rate should be determined, and after installation of the facility, if the manager does not check the load unbalance rate from time to time, the load unbalance may not be detected, resulting in a power factor drop and damage to the power supply transformer.

The present invention utilizes the previously-applied 10-2009-0001728 phase power meter to detect phase inequality by receiving data from the integrated controller through the output line of the UTP cable. Power meters are known from the art.

By utilizing the uninterruptible power supply, load imbalance is improved to improve the life span and power factor of the transformer and achieve energy saving effect.

The prior art is different from the present invention in that it detects phase imbalance, compensates with reactance or resistance component, and performs peak control with a three-phase or single-phase generator, and is a technology separate from the peak control concept.

Emergency generator peak control is a technology that replaces some of the required power by generating power from the emergency generator during peak season as the maximum power demand control.

In particular, the actual demand for load varies according to seasons and seasons. (The final terminal load is not uniform for each phase. For example, the power consumption of three computers in an office is considered in each phase (A-R, B) (C-S phase, C C-T phase) wired to the terminal outlet, but when Mr. A leaves the office, R phase is not loaded and the rest is loaded. Doesn't happen, but in the end, it can be said that the imbalance is greatly affected by season and time, and it is inevitable.

If phase imbalance occurs over the setting value set by the administrator, the phase imbalance is improved by supplying the stored power through the uninterruptible power supply to the load wired on the relatively overloaded phase.

Improved phase imbalance of load prevents power factor improvement and burnout of power distribution equipment.

In particular, the phase imbalance can be immediately and simply improved in consideration of the reality that the load demand for each phase is varied according to seasons and time zones differently from the prior art.

1 is a simplified diagram of the present invention
2 is a simplified diagram of a pre- filed phase power meter capable of measuring the amount of current for each of the R, S, T, and N phases;
Figure 3 is a simplified diagram for explaining the principle of the phase load switchgear

The high voltage (6,600V or more and 22,900V) drawn through the high voltage inlet from KEPCO is introduced into the transformer (TR) through the automatic failure switch (LBS), lightning arrester, high voltage fuse, and instrument transformer (MOF) in the high voltage board. When converted into low voltage and introduced into the low voltage plate, the common power supply of AC 220V, single phase 380V, three phase 380V is supplied to the load through an earth leakage breaker, wiring breaker, current transformer, terminal block, etc. in the low platen cubicle. DC 110V is supplied to the low platen through the storage battery in the ground, and the low platen is driven by DC 110V driving power to drive various automatic control devices and measuring devices, and separately installs an uninterruptible power supply (UPS) to cope with power failure. It has a normal switchboard configuration.

The integrated control controller is a server-class microprocessor based on the Windows XP operating system.

A microprocessor is a TTL or CMOS IC that operates only on certain characteristics, whereas a microprocessor allows an administrator to inject a program into the processor to achieve the desired operating characteristics. The microcontroller for the entire control program and operation is also called the motherboard (MOTHERBOARD) or the motherboard (MAINBOARD).

It will be described in detail with reference to the drawings.

1 is a schematic diagram of the present invention installed in the switchboard according to the present invention, the low voltage power stepped down to the low voltage in the transformer of the switchboard high-voltage board receives power in R, S, T phase (N is a neutral wire).

The phase inlet power supply passes through the phase power meter 30 that measures the amount of inrush current for each phase drawn from the transformer in the switchboard high voltage panel to the low platen, and the phase power meter passes through the through holes for each phase as shown in FIG. 2. One embodiment consists of a current transformer for measuring the amount of current in the.

2 is a simplified diagram of a pre- filed phase power meter capable of measuring the amount of current for each of the R, S, T, and N phases.

The following detailed description is replaced by the original content of claim 1 of the phase-applied power meter.

Claim 1 "Bus bars with holes that can be bolted to the R, S, T, N phase busbars coupled to the output terminals of each phase of the circuit breaker and bolted; internal bus penetrating An integrated block in which four blocks are arranged in a row with a rectangular block centered around the hole; three current blocks passing through the R, S, and T phase busbars include: a current transformer that detects a magnetic field of a current flowing through the coils by winding a coil; The busbars of each phase passing through include R, S, T, and N phase busbar output terminals with holes for fastening by bolts; outer squares surrounding the outside of the four connected blocks Coils are wound inside the external rectangular block to detect the leakage current by detecting the magnetic field of the current flowing through the R, S, T, and N phases. A block including a T-phase current transformer and a coil in which the N-phase busbar penetrates and an external rectangular block including an image current transformer are integrally formed; and the output line of each coil is Rj- connected to the integrated block. Phase power meter characterized in that it is wired to the 45 jack and bound together by UTP (Unshielded Twisted Pair) cable "

3 is a simplified diagram for explaining the principle of the phase load switching switch, when the incoming power 40 of the R phase supplying power to the load from the low voltage plate in the switchboard and the power 41 stored in the uninterruptible power supply are automatically loaded. The switching switch 21 or the relay selects and outputs the power of one of the incoming power 40 in R and the power 41 stored in the uninterruptible power supply according to the control command of the integrated control controller.

Hereinafter will be described in detail through an embodiment.

It consists of an uninterruptible power supply, an integrated controller, a phase power meter, a phase load switch, a monitor, and a user input device.

The phase current meter information measured by the phase power meter that measures the amount of inrush current for each phase that is drawn from the transformer in the switchboard to the low platen, and the phase power meter that measures the amount of current for each phase that supplies power to the load in the low panel. Unshielded Twisted Pair) cable to the integrated controller.

The user input device is a user input device that sets a phase unbalance ratio reference value that determines whether to supply the accumulated power to the uninterruptible power supply for improving the phase imbalance.

The uninterruptible power supply supplies emergency power in case of power failure under the control of the integrated controller, and supplies a part of the accumulated power to the phase unbalance compensation power when the phase unbalance exceeds the reference value set by the user input device. It is a power supply.

The phase load transfer switch receives the incoming power from the phase input power supply and the uninterruptible power supply that supplies power to the load from the low voltage plate in the switchboard and normally outputs the phase incoming power, but supplies the uninterruptible power according to the control signal of the integrated controller. Phase load switching switch that selectively outputs the accumulated power of the device.

The monitor displays the information of the load unbalance by each monitor output from the integrated controller, whether the uninterruptible power supply uses the accumulated power, and the information that improves the phase unbalance by using the accumulated power of the uninterruptible power supply.

The integrated controller is composed of microprocessors, which are measured by the phase power meter that measures the amount of draw current for each phase that flows from the transformer in the switchboard to the low platen, and the phase power meter that measures the amount of current for each phase that supplies the load from the low platen. The current amount information of each phase is supplied through the UTP (Unshielded Twisted Pair) cable to display the unbalance of each phase which is introduced into the low platen and the unbalance of each phase that supplies the load from the low platen to the monitor.

 The integrated controller is composed of a microprocessor and determines whether to supply the storage power of the uninterruptible power supply to improve the phase imbalance when the user input device exceeds the phase unbalance ratio value input by the administrator.

As an example, when the phase inequality (power factor) reference value input by the administrator in the user input device is at least 85% and maximum 90%, when the phase inequality (power factor) falls below 85%, the unbalance rate is most likely through the phase power meter. The phase load transfer switch is used to supply the high phase load to the uninterruptible power supply until the phase unbalance (power factor) reaches 90%.

It will be described in detail with reference to FIG.

Referring to FIG. 1, the load of 70Kw in the entire R phase, 60Kw in the entire S phase and 50Kw in the entire T phase results in a maximum phase unbalance (power factor) of R and T phases of 83%. 15Kw of high R load is replaced by storage charge of uninterruptible power supply. As a result, 55Kw (70Kw-15Kw) for all R phase, 60Kw for all S phase, 50Kw for all T phase, and 15Kw for uninterruptible power supply. Therefore, the maximum phase unbalance (power factor) of S phase and T phase is 90%, which improves phase imbalance and improves power factor.

The integrated controller is composed of microprocessors, which generate control signals to the phase load switchgear to compensate for phase imbalance among the loads in which phase imbalance occurs. Transfer through the phase load switchgear with the power accumulated in.

The integrated controller is composed of microprocessors and calculates the phase inequality by the phase power meter that measures the amount of inrush current for each phase from the transformer in the high voltage plate to the low platen. A switchboard digital controller comprising an integrated controller comprising a microprocessor that determines whether the uninterruptible power supply is used according to a reference value, and determines and controls the additional supply of accumulated power of the uninterruptible power supply through a phase load switch.

In one embodiment, the phase power meter is a switchboard digital controller, characterized in that replaced by a current transformer.

In one embodiment, the uninterruptible power supply is a switchboard digital controller, characterized in that replaced by a single-phase emergency generator.

20: Phase load switching switch
21: Automatic Load Transfer Switch (ALTS)
30: Phase power meter that measures the amount of inrush current for each phase that is drawn from the transformer in the switchboard high voltage board to the low voltage board
31: Phase power meter that measures the amount of current for each phase that powers the load in the low voltage plate
40: Phase incoming power supplying power to the load from the low voltage panel in the switchboard
41: power stored in an uninterruptible power supply

Claims (3)

Uninterruptible power supply, integrated controller, phase power meter, phase load switch, monitor, and user input device;
The phase current meter information measured by the phase power meter that measures the amount of inrush current for each phase that is drawn from the transformer in the switchboard to the low platen, and the phase power meter that measures the amount of current for each phase that supplies power to the load in the low panel. Unshielded Twisted Pair) cable to the integrated controller;
The user input device is a user input device for setting a phase unbalance ratio reference value for determining whether to supply the accumulated power to the uninterruptible power supply for improving phase imbalance;
The uninterruptible power supply supplies emergency power in case of power failure under the control of the integrated controller, and supplies a part of the accumulated power to the phase unbalance compensation power when the phase unbalance exceeds the reference value set by the user input device. A power supply;
The phase load transfer switch receives the phase inlet power supplying the load from the low voltage plate in the switchboard and the uninterrupted power supply from the uninterruptible power supply and normally outputs the phase inlet power, but supplies the uninterruptible power according to the control signal of the integrated controller. A phase load switchgear for outputting the stored power of the device;
The monitor is a monitor that displays load unbalance information for each phase output from the integrated controller, whether the power of the uninterruptible power supply is used, and information that has improved the phase imbalance by using the accumulated power of the uninterruptible power supply;
The integrated controller is composed of microprocessors, which are measured by the phase power meter that measures the amount of draw current for each phase that flows from the transformer in the switchboard to the low platen, and the phase power meter that measures the amount of current for each phase that supplies the load from the low platen. The current amount information of each phase is supplied through UTP (Unshielded Twisted Pair) cable to display the unbalance of each phase which is introduced into the low platen and the unbalance of each phase that supplies the load from the low platen to the monitor.
If the user input device exceeds the standard unbalance rate value input by the administrator, it determines whether to supply the storage power of the uninterruptible power supply to improve the unbalance.
Phase load switching switch is a power stored in the uninterruptible power supply that generates power to the load from the low voltage panel in the switchboard by generating a control signal to the phase load switchgear to compensate for the phase imbalance among the loads in which the phase imbalance occurs. Alternating through
Uninterruptible power supply is calculated according to whether the phase unbalance ratio exceeds the phase unbalance ratio reference value input through the user input device by calculating the phase unbalance rate through the phase power meter that measures the amount of inrush current for each phase from the transformer in the high voltage panel to the low voltage plate. A switchboard digital controller comprising an integrated controller consisting of microprocessors that determine whether or not device power is used and through which the uninterruptible power supply provides an additional supply of storage power.
The switchboard digital controller according to claim 1, wherein the phase power meter is replaced by a current transformer.
The switchboard digital controller according to claim 1, wherein the uninterruptible power supply is replaced with a single-phase emergency generator.

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