KR100984115B1 - The syn-controller of a pannel of in a generator in case of emergency - Google Patents

Abstract

PURPOSE: An integrated controller of a distribution panel emergency generator control device is provided to improve the lifespan and power factor of a transformer by improving the imbalance of a load. CONSTITUTION: A power analyzer(30,31) measure a current which flows into a lower voltage panel from the transformer of a high voltage panel. An integrated controller receives the measurement data of the power analyzer through a UTP(Unshielded Twisted Pair) cable. A user input device sets the reference value of a phase unbalance rate. A single phase emergency generator is driven with the control of the integrated controller. A load switch outputs the power which is generated with the drive of the single phase emergency generator. A monitor displays the load unbalance information.

Description

Integrated controller of switchboard emergency generator control {The syn-controller of a pannel of in a generator in case of emergency}

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 emergency generator.

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, the load amount varies depending on the 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.

It improves load inequality by using single-phase emergency generator to improve the life span and power factor of transformer and save energy.

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.

Particularly, the actual demand for load varies according to seasons and seasons. (The final terminal load is not uniform for each phase. For example, three computer power sources in the office are considered for each phase (A, B-R-R phase). , C, D-S phase, E, F-T phase), but when Mr. A leaves the office, the R phase decreases the load and the rest becomes relatively unbalanced. In view of the above, the extreme phenomenon does not occur, but inevitably, the phase imbalance is greatly affected by season and time, and the phase imbalance is inevitable.)

If phase imbalance occurs over the set value set by the administrator, the phase imbalance is improved by supplying the generated power through the single-phase emergency generator to the load wired on the 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
Figure 3 is a simplified diagram for explaining the principle of the phase load switching switch
Figure 4 is a simplified diagram showing the load vector to the center of gravity to understand the improvement of phase load imbalance

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 "

Figure 3 is a simplified diagram for explaining the principle of the phase load switching circuit breaker power supply (41) generated in accordance with the R-phase incoming power supply 40 to supply power to the load in the low voltage panel in the switchgear and the single-phase emergency generator generated from the single-phase emergency generator When the power is input, the power of one of the power supply 41 generated by driving the incoming power 40 of R phase and the single phase emergency generator generated by the single phase emergency generator according to the control command of the integrated control controller by the automatic load switching switch 21 or the relay. Select output.

Figure 4 is a simplified representation of the load vector to understand the phase load imbalance improvement in the center of gravity, when the load on the T phase, such as before the T phase compensation, the center of gravity of the maximum load vector (10), that is the actual load at the center of gravity of the equilateral triangle The distance between the center of gravity (11) of the load vector of the load (T phase is a relatively heavy load) is greatly increased, reducing the power factor as a whole and shortening the life of the transformer.

However, when the T phase load is shared by the single-phase emergency generator, such as after the T phase compensation, the load vector of the actual load (the load in which the T phase is relatively loaded) at the center of gravity of the maximum load vector (10), that is, the center of gravity of the equilateral triangle. The interval between the center of gravity (11) is narrowed to improve the overall power factor and improve the life of the transformer.

Hereinafter will be described in detail through an embodiment.

The present invention is installed in a low voltage switchgear and consists of a single phase emergency generator, an integrated controller, a phase power measuring instrument, a phase load switching 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 production power by driving a single-phase emergency generator to improve phase imbalance.

A single phase emergency generator is a single phase emergency generator that is driven under the control of an integrated controller to generate power.

The phase load transfer switch receives the phase inlet power supplying the load from the low voltage plate in the switchboard and the power generation of the single phase emergency generator in accordance with the operation of the single phase emergency generator, and outputs the phase inlet power in normal, but to the control signal of the integrated controller. Therefore, it is a phase load switching switch that selectively outputs the power generated by driving the single-phase emergency generator.

The monitor displays load unbalance information, whether the single-phase emergency generator is activated, and the degree of phase imbalance improved by driving the single-phase emergency generator through the monitor for each phase output from the integrated controller.

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 if the user input device exceeds the standard imbalance ratio input by the administrator, the single-phase emergency generator is driven to determine whether to supply the production power to improve the imbalance.

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. A phase load transfer switch is used to power the high phase load until the phase imbalance (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%. Replace the 15Kw load of the high R phase with the emergency generator driving power. As a result, 55Kw (70Kw-15Kw) for the entire R phase, 60Kw for the entire S phase, 50Kw for the entire T phase, and 15Kw for the emergency generator. The maximum phase imbalance (power factor) of T phase is 90%, which improves phase imbalance and improves power factor.

The integrated controller is composed of microprocessors, which generates control signals to the phase load switchgear to compensate for phase imbalance among the loads in which phase imbalance occurs. The power generated by driving the developed single-phase emergency generator is transferred through the phase load transfer switch.

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. Integration of the switchboard emergency generator control unit, characterized by an integrated controller consisting of microprocessors that determine whether the single-phase emergency generator is operated according to the reference value and whether the single-phase emergency generator is further supplied with the production power of the single-phase emergency generator. It's a controller.

In one embodiment, the phase power meter is an integrated controller of the switchboard emergency generator control device, characterized in that replaced by a current transformer.

10: center of gravity of the maximum load vector
11: center of gravity of the load vector
12: T phase load vector compensated by 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: The power generated from the single-phase emergency generator by driving the single-phase emergency generator

Claims (2)

Single phase emergency generator, integrated controller, phase power meter, phase load switchgear, monitor, 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 production power by driving a single-phase emergency generator to improve phase imbalance;
Single phase emergency generator is a single phase emergency generator which is driven under the control of the integrated controller to generate electric power;
The phase load transfer switch receives the power generated from the single phase emergency generator according to the phase inrush power supply and the single phase emergency generator driving power supplying the load from the low voltage plate in the switchboard and normally outputs the phase inflow power, but to the control signal of the integrated controller. According to the phase load switching switch for outputting the power generated by driving the single-phase emergency generator;
The monitor is a monitor that displays load unbalance information for each phase output from the integrated controller, whether the single-phase emergency generator is operated, and information that improves the phase imbalance by driving the single-phase emergency generator;
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 imbalance rate entered by the administrator, the single-phase emergency generator is driven to improve the imbalance.
A phase-input power supply that supplies power to the load from the low voltage plate in the switchboard by generating a control signal to the phase load switchgear to compensate for phase imbalance among the loads in which phase imbalance occurs. Transfer through the phase load switchgear
The phase inequality is calculated by phase power meter that measures the amount of inrush current for each phase from the transformer in the high voltage board to the low voltage plate. Integrated controller of switchboard emergency generator control device, characterized in that the integrated controller consisting of a microprocessor for determining and controlling the additional supply of the production power of the single-phase emergency generator through the phase load switching switch.
2. The integrated controller of claim 1, wherein the phase power meter is replaced with a current transformer.

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