KR910004583Y1 - Power metering damage hour detecting system using disconnecting sensor in m.o.f. - Google Patents

Abstract

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Description

Breakdown time identification device of electricity meter by detecting disconnection in instrument transformer (MOF)

1 is a block diagram schematically illustrating the overall configuration of the present invention.

FIG. 2 is a circuit diagram of the detector and the counter of FIG.

3 is a circuit diagram of the power supply of FIG.

* Explanation of symbols for main parts of the drawings

1: Identification device 2: Instrument transformer

4: sensing circuit part 6: counter circuit part

8: Power supply circuit part 1S, 1L-3S, 3L, P ₁ -P ₃ : Line

A ₁ -A ₆ : Amplifier CT ₁ -CT ₃ : Current transformer

C _V1 C _V6 : Voltage Comparator PT: Transformer

PL ₁ -PL ₆ : Indicator TR ₁ -RT ₆ : Switching TR

The present invention relates to a device that can identify the failure time of the Wattmeter by detecting the disconnection in the instrument transformer (MOF = Metering OutFit), more specifically, it is installed to measure the power consumption of the user In the high-voltage power receiving equipment, the circuits of the current transformer and the power transformer in the instrument transformer are configured to have a sensing circuit portion for detecting short-circuit time and a counter circuit portion operated by the sensing circuit. It makes it easy to identify when the electricity meter has failed to operate, ie the total elapsed time from peak failure to confirmation.

Conventionally, in the high-voltage power supply facilities, when the current line or the voltage lines in the transformer of the instrument are not operated due to an unexpected short circuit, the user immediately detects this and informs the supplier of the electricity rate calculation problem used until then. There is no possibility that there will be any fertilization between the supplier side and the user side, but if it is discovered after a long time, the electricity used for the reason that the user side or the supplier side cannot determine exactly when the failure occurred In calculating the charges, there was always a lot of material for fertilization, especially in large factories that use a lot of electricity.

The present invention has been made to solve the above-mentioned conventional drawbacks, the object of the present invention is to display the electricity consumption due to the unexpected short-circuit of the current from the transformer or instrument transformer disposed in the instrument transformer in the high-voltage power supply facilities When the electricity meter is not operated, the total elapsed time from the time of the first failure to the confirmation and repair of the relevant person is displayed so that it can be easily known even when the failure is known after a long time since the failure occurred. In addition to eliminating the factors related to the electricity bill between the user and the supplier side, and providing the user to avoid the disadvantages caused by miscalculation of the electricity bill.

In order to achieve the above object, the present invention, in the high-voltage power supply facilities, connected to the current line disposed in the transformer for the instrument and the line drawn out from the instrument transformer, connected to the sensing circuit unit for detecting this when the line is short-circuited, the detection The circuit unit is connected to the counter circuit unit operated by the sensing circuit, and the counter circuit unit is connected to the power supply circuit unit connected to the line of the instrument transformer for supplying the predetermined operating power, and also supplies power to the sensing circuit unit side. The circuit is connected to the counter circuit section, and an ordinary power meter is connected to the counter circuit section. The line short detection circuit includes an amplifier having a work side connected to each line of a current transformer and an instrument transformer, and a diode and a resistor from the output side of the amplifier. A voltage comparator connected via a rectifying circuit section comprising a capacitor, It consists of a switching TR connected to the output side of the voltage comparator, and an indicator for displaying each fault line connected to the emitter of the switching TR.

Hereinafter, an embodiment of the present invention based on the accompanying drawings.

Lines (1S, 1L) drawn from current transformers (CT ₁ -CT ₃ ) and instrument transformers (PT) installed in instrument transformers (MOF) (2) in high-voltage power plants. 3S, 3L) and (P ₁ -P ₃ ) are connected to the lines 1S, 1L-(3S, 3L) and (P ₁ -P ₃ ) with a sensing circuit section 4 which detects an unexpected short circuit. The sensing circuit section 4 is connected to a counter circuit section 6 which is operated when the short circuits of the lines 1S, 1L-3S, 3L and P ₁ -P ₃ are detected. The counter circuit section 6 is connected to a line P ₁ -P ₀ drawn from the instrument transformer 2 so that a constant operating power is always supplied regardless of a short circuit of the lines P ₁ -P ₀ . The power supply circuit unit 8 is connected to the power supply circuit unit 8, and the power supply circuit unit 8 is also connected to the sensing circuit unit 4 side, and the counter circuit unit 6 is connected to a normal power meter 10. Power meter (10) The time to failure identification device (1).

Each of the sensing circuits S _1- S ₆ of the sensing circuit unit 4 is configured as shown in FIG. 2, and the sensing circuits S _1- S ₆ are all made identical, so only one of them is an example. Explain to listen. That is, the lines (1S, 1L)-(3S, 3L), (P _1- P ₃ ) short circuit detection circuit (S _1- S ₆ ) is a current transformer (CT _1- CT ₃ ) and instrument transformer (PT) The amplifiers A _1- A ₆ having an input side connected to the respective lines 1S, 1L-(3S, 3L) and (P ₁ , P ₃ ) of the diode and the diode from the output side of this amplifier A ₁ -A ₆ . (D ₁ -D ₆ ) (D _1-1 -D _1-6 ), resistance (R ₁ -R ₆ ) (R _1-1 -R _1-6 ) (R _2-1 -R _2-6 ), A voltage comparator C _V1 , C _V6 connected via a rectifying circuit consisting of capacitors C ₁ -C ₆ via R _r1 -R _r6 , and an output side of the voltage comparators C _V1 , C _V6 . It consists of indicators (PL _1- PL ₆ ) indicating whether the switching (P ₁ -P ₃ ) is short-circuited.

On the other hand, detailed circuit configuration description of the counter circuit section 6 is omitted since it is a general purpose. The voltages between the phases of the power supply circuit unit 8 are the same, and unless the two or more lines P ₁ -P ₀ drawn out from the instrument transformer PT are shorted, the operating power is always constant. 6) is supplied.

In the drawings, reference numeral LS denotes a line switch, T denotes a terminal block, 12 denotes a counter expressed in units of time, C denotes a capacitor for absorbing abnormal voltage, and D _2-1 -D _2-6. ) Is a backflow prevention diode.

In such a configuration, normally, the indicators PL ₁ -PL ₆ installed in each of the sensing circuits S _1- S _{6 of the} sensing circuit unit ₆ are in an "on" state, and the power consumption used is a power meter ( 10) appears immediately. In this normal state, the lines 1S, 1L)-(3S, 3L), which are drawn from the current transformer CT ₁ -CT ₃ or the instrument transformer PT and connected to the sensing circuits S ₁ -S ₆ , ( When any one of P ₁ -P ₃ is shorted and the electricity meter 10 does not operate. For example, the sensing circuit S1 connected to the lines 1S and 1L in FIG. 1 and FIG. The circuit unit 6 is operated. That is, since the short circuit of the lines 1S and 1L cuts off the power supply to the sensing circuit S ₁ , the switching TR (TR ₁ which is normally in the conduction position to turn on the indicator PL ₁ in the "on" state). ) Is in a non-conducting position, so the indicator light PL ₁ is naturally "off" so that it is possible to know which line 1S, 1L in the transformer unit 2 is shorted from the outside and easily breaks the fault line 1S. , 1L) to locate and to be repaired, this detecting circuit, as at the same time shown in FIG. 2 (S ₁₎ and the counter circuit 6 of the connection versatility is detected as shown in the circuit (S ₁₎ is broken track By operating the moment of detecting (1S, 1L) and displaying the number on the counter 12 every hour, it is possible to accurately calculate the charge for power usage by determining when the electricity meter 10 has not been operated. give.

In the above example, only the sensing circuit S ₁ has been described as an example. However, when other lines 2S, 2L, 3S, 3L, and P ₁ -P ₃ are shorted or all are shorted. Also, since the same as the above example, a separate description thereof will be omitted.

As such, the present invention indicates which lines are short-circuited as sensing by each sensing circuit, when each line is short-circuited in the transformer for the instrument in the high-voltage power supply facility and the meter is not operated due to an unexpected reason. It is easy to repair and displays the total time from the first failure to the confirmation by counting every hour by operation of the counter, so that charge calculation for power usage can be performed accurately. There is an excellent effect of eliminating the problems such as frequent occurrence between the supplier and the user, and also solves the problem that the user has to pay the disadvantage only at the user side with the conventionally applied power calculation time.

Claims (2)

In the high-voltage power supply equipment, the lines (1S, 1L) (3S, 3L) and (P ₁ -P ₃ ) of the current transformers (CT ₁ -CT ₃ ) and the instrument transformer (PT) disposed in the instrument transformer ( ₂ ). Is connected to a sensing circuit section 4 for sensing this when the line is shorted, and a counter circuit section 6 which is operated in association with the sensing circuits S ₁ -S ₆ is connected to the sensing circuit section 4, and the counter circuit section is connected to the sensing circuit section 4. The power supply circuit section 8 connected to the line of the instrument transformer PT is connected to the power supply circuit section 8 at the side of the sensing circuit section. And a normal power meter (10) connected to the counter circuit section (6), and configured to detect a failure time of the power meter by disconnection detection in the transformer for an instrument. According to claim 1, wherein the sensing circuit (S ₁ -S ₆ ) is a line (1S, 1L)-(3S, 3L), (P _1- ) of the current transformer (CT ₁ -CT ₃ ) and instrument transformer (PT) Amplifiers A ₁ -A ₆ connected to the input side P ₃ ), diodes D ₁ -D ₆ (D _1-1 -D _1-6 ), and resistors R ₁ -R ₆ from the output side of the amplifier. Voltage connected via (R ₁₁ -R ₁₆ ) from a rectifying circuit consisting of (R _1-1 -R _1-6 ) (R _2-1 -R _2-6 ) and capacitors (C ₁ -C ₆ ) Comparators C _V1 and C _V6 ; Disconnection in an instrument transformer comprising a switching TR (TR _1- TR ₆ ) connected to the output side of the voltage comparator and a fault line display indicator (PL _1- PL ₆ ) connected to the emitter of the switching TR. Power meter failure time identification device by detection.