JP2006343339A - Method and device for operation control for low-voltage load - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and device for operation control for low-voltage load capable of precisely and continuously following to the load control value, without using industrial water and capable of maintaining the value at the load characteristic testing for an electric generator and the like. <P>SOLUTION: The operation control device adopts characteristic constitution of an electric power source G; a ground relay GR; a volt meter V; a power meter P; an ampere meter A; a main circuit breaker CB; a resistor bank groups αL, αH to be connected to the loading device equipped with the CBH, wherein the bank α is divided into a plurality number (2-N); and switches CL and a controller CV are provided to the each resistor bank groups α1 to αN which are assigned with the power capacity, obtained by dividing the maximum power capacity with 1/2 to 1/2<SP>(n-1)</SP>based on the binary numbers, wherein; a control CV is composed of a control value memorized operation circuit MC for maintaining the load control value and a comparison calculation transferring circuit OC for transferring ON/OFF signals to the switches CL provided in between with each of resistor banks α1 to αN. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a low-pressure load calculation control method using a dry-type metal resistor used for a load characteristic test of a high-voltage power generator and a device directly used for its implementation.

  Conventionally, a dry load system using a water tank system or a metal resistor has been used as a method for performing a load characteristic test of a power generator.

  About 20 years ago, in the load characteristic test, three electrodes were hung from the top in a state where electrode water was stretched in a water tank of 2 meters in length, 2 meters in width, and 1.5 meters in height. A water tank system that continuously adjusts electric power while adjusting was used as the main method.

  In this water tank system, the temperature of the electrode water rises with the consumption of electric power, and arc discharge starts when the temperature of the electrode water reaches about 75 degrees in the boosted state. Therefore, in order to suppress arc discharge, a method of frequently supplying cold water and lowering the electrode water temperature was used, but at the same time as supplying water, a large amount of drainage rising to 75 degrees was discharged, and the amount was 1 It was up to 16 cubic meters in time.

  Therefore, in order to solve the problem of treatment of hot waste water generated by the water tank method, a load characteristic test method that does not use electrode water as shown in Prior Art Document 1 by the present inventor is mainly applied to the bottom of a cylindrical base electrode. A pure resistor which is a load device system that inserts an electrode and inserts an insulating sheath between both electric powers, consumes power using the electrode water between both electrodes as a resistor, and continuously adjusts the load. Utilized the method used.

  When this method is used, the consumption of water can be reduced to one-tenth of the above water tank system by cooling the electrode water heated to a high temperature with a blower and a water spray and reusing it. It has the excellent effect of eliminating the need for emissions.

Japanese Patent No. 1462423

  However, the load device system using a pure resistor has the advantage of being able to adjust the load continuously without discharging hot electrode water, but its use is similar to the water tank system for system operation. If a large amount of electrode water is required and the system utilization environment is, for example, the northern country, the electrode water may be frozen in the sub-zero environment in winter, so that the maintenance is troublesome.

  As described above, in facilities where hot water treatment is not possible or water is difficult to secure, a load device using a dry metal resistor is used as a device for adjusting the load without using electrode water. However, the metal resistor has poor insulation performance, and there are many parts with risk factors such as burning of the metal resistor itself, so it could not be said to be a complete solution.

  Therefore, in order to solve the above-mentioned problem, as shown in Patent Document 2, the resistor element is supported by an insulating sheath tube corresponding to the operating voltage, the unexpected arc discharge and the chain disconnection of the resistor element are suppressed, and the metal resistance Invented a dry-type high-pressure load device capable of preventing the ignition of the vessel.

JP 2003-193358 A

  When fine adjustment of the voltage is performed in the load device using the resistor element of Patent Document 2, for example, when a load device of 2000 kW is used, three 500 kW units and one 250 kW unit are installed in the high voltage bank as shown in FIG. In addition to coarse adjustment, one 125 kw unit and two 62.5 kw units are installed in the low-voltage bank via a transformer, and the load can be finely adjusted while changing the value stepwise for each combination. It becomes.

In the adjustment of the load control value as the target value using this low-pressure bank, the minimum value that can be set is 62.5 kW, and the resolution value indicating how accurate the load control value is relative to the target value is From Formula 1, it is derived as 3.125%.

  At this time, since the least common multiple of the target value is 62.5 kW, when a target value other than a multiple of 62.5 kW is used as a target value, it is usual to use a slide transformer for the minimum capacity bank.

  However, when a smooth load control value is adjusted using a slide transformer, a smooth load control value is required because a two-stage switching operation of adjusting the slide after setting the ON / OFF state of the bank is required. This makes it difficult to adjust.

  In addition, when a 500 kw bank is switched on at room temperature, it has a feature that it converges with the passage of time due to the temperature coefficient of the metal resistor, and when the temperature coefficient is assumed to be 5%, the input initial value showed 525 kw. However, since it converges to 500 kw with the passage of time, even if a combination corresponding to the target value is calculated and executed on the mathematical formula, the value will change after a few minutes. It is impossible to maintain the target value.

  Furthermore, in order to make adjustments in the field environment of the test operation, it is necessary to arrange a worker who adjusts near the slide transformer and a worker who operates the load device, but noise of 120 dB is driven when the diesel engine is driven. Since this occurs, the transmission of the target value between the workers is very difficult to hear and may cause an erroneous operation.

  Further, as a measure for improving the above-mentioned difficulty, as shown in Patent Document 3 below, a method of bringing the value close to an arbitrary value by using a switch corresponding to a three-phase resistor circuit so that high voltage and low voltage can be shared and high speed switching is possible. However, even if it is possible to increase the speed, the switch is required about 3 times, so the structure becomes complicated, large size and high cost cannot be denied, and the accuracy is 4.5%. And almost the same.

Japanese Patent Application No. 2003-193358

  Furthermore, the use of a large number of switches causes an increase in failures and complicates maintenance, inspection, facility adjustment, and repair. Even with Patent Document 3, it is difficult to solve the above-described problems.

  Here, the main objects to be solved by the present invention are as follows.

  That is, the first object of the present invention is to provide a low-pressure load calculation control method and apparatus capable of continuously following a load control value accurately without using industrial water and maintaining the value. .

  The second object of the present invention is to provide a low-pressure load calculation control method and apparatus capable of accurately adjusting a load continuously with only a small number of switches, reducing the manufacturing cost by reducing the number of switches, and improving maintainability. It is to be provided.

  The third object of the present invention is to provide a low-pressure load calculation control method and apparatus which can be freed from manual calculation of bank combinations by automatically calculating load control values.

  Other objects of the present invention will become apparent from the specification, drawings, and particularly from the claims.

  In solving the above problems, the present invention device is connected to a load device equipped with a power meter, ground fault relay, voltmeter, power meter, ammeter, main breaker in the middle of the power cable connecting the power supply device. Each of the resistor banks is divided into a plurality (2-N), and the power capacities obtained by dividing the maximum power capacities of the resistor bank groups from 1/2 to 2n-1 based on binary numbers are allocated and held. A resistor bank is provided with a switch and a controller, and the control value storage arithmetic circuit that holds the load control value and the power capacity value of each grade resistor bank and the upper grade are already subtracted in the controller. And a comparison operation transfer circuit for comparing the load control values and transferring an ON / OFF signal to a switch provided in each resistor bank.

  In the method of the present invention, the resistor bank in the load adjusting device is divided into a plurality of (2-N) grades, and the total maximum power capacity of the resistor bank group is divided from 1/2 to 2n-1 minutes based on a binary number. 1 divided by 1 is assigned to each resistor bank, and the target load control value set by the control value storage arithmetic circuit and the power capacity value assigned to each resistor bank are compared and transferred. It has a feature of taking a low-voltage load calculation control method for deriving a combination of each resistor bank ON / OFF indicating an approximate value of the load control value while subtracting for each comparison and grade by a circuit.

  More specifically, in solving the problem, the present invention achieves the above-mentioned object by adopting a novel characteristic configuration means or method relating to the subordinate concept from the superordinate concept listed below. The

  That is, the first feature of the method according to the present invention is that when the resistor bank group is divided into a plurality of the load characteristic tests of the generator, the power capacity of all the resistors is gradually reduced from the higher rank to the lower rank than the comparison calculation. In order to obtain an approximate value of the target value to be divided and assigned to each resistor bank, a low voltage that automatically adjusts the ON / OFF combination of each resistor bank in order from upper to lower grades In the load calculation control method, first, the resistor bank group connected to the power supply device via the power cable is divided into a plurality (2 to N [N is a natural number]), and then all the resistor bank groups are divided. Each of the first to Nth resistances obtained by dividing the maximum power capacity based on the binary system and the values calculated from the upper to lower grades of the power capacity corresponding to 1/2 to 2n−1. Assigned to the body bank, then said After setting the load control value as a target value by the control means connected to the resistor bank, the corresponding first said resistor is set by the first calculation means in the comparison calculation transfer circuit in the control means. The power capacity held by the bank is compared with the load control value. If the load control value is equal to or greater than the power capacity, the power capacity is subtracted from the load control value and stored as a remaining value, and the second value is stored. The remaining value is analog-transferred to the arithmetic means, and the digital signal indicating the ON state is transferred to the first resistor bank. On the other hand, if the load control value is less than the power capacity, the load control value is set to the second The analog value is transferred to the calculation means, and the remaining value received from the next higher rank calculation means and the power capacity of the next lower rank resistor bank are sequentially compared from the second calculation means to the Nth calculation means. And go If the remaining value is greater than or equal to the power capacity of the corresponding resistor bank, the power capacity is subtracted from the remaining value each time, stored as the next lower class remaining value, and stored in the next lower class computing means. The numerical value is transferred in analog, and the digital signal indicating the ON state is transferred to the resistor bank corresponding to each of the second to Nth operations, while the next higher-grade remaining value is less than or equal to the power capacity. If there is, a low-pressure load calculation control method is adopted in which the next higher-order class remaining value is analog-transferred to the next lower-class calculation means as the next lower-class remaining value and sequentially executed.

  According to a second feature of the method of the present invention, the load control value in the first feature of the method of the present invention is such that when the UP button of a pushbutton switch connected to the control means is pressed, the change value in the increasing direction is the control value. The value transferred to the control value storage arithmetic circuit of the means is updated and increased while the value held in the control value storage arithmetic circuit is updated. On the other hand, when the DOWN button of the pushbutton switch is pressed, the change value in the decreasing direction is The configuration is a low-pressure load calculation control method in which a target value is set by updating and decreasing the value transferred to the circuit and held in the control value storage calculation circuit.

  According to a third feature of the method of the present invention, the divided class number N in the first or second feature of the method of the present invention is seven, and the total maximum power capacity of the resistor bank group is expressed in binary. The low pressure load calculation control method is divided into 7 grades from 1/2 to 128 based on the law.

  A fourth feature of the method of the present invention is that the total maximum power capacity of the resistor bank group in the first, second or third feature of the method of the present invention is the same as the required number of the divided grades N. A configuration of a low-pressure load calculation control method is provided in which a plurality of graded resistor banks can be arranged side by side to be increased.

  The first feature of the device according to the present invention is that, in the load characteristic test of the generator, when dividing the resistor bank group into a plurality, each of the power capacities of all the resistors is gradually reduced from the upper rank to the lower rank by the comparison calculation. Dividing into resistor banks, assigning them, and selecting the ON / OFF combinations of each resistor bank in order from the upper to the lower grades in order to obtain an approximate value of the load control value to be set, and calculating the addition / subtraction A low-voltage load calculation and control device for branching and connecting a resistor bank to two or more (2 to N [N is a natural number]) by branch connection to an end of a power cable connected to the power supply device. The power capacity is gradually reduced from the upper rank to the lower grade, and is divided and assigned to each resistor bank and each resistor bank of the resistor bank group, and each resistor bank is switched ON / OFF. A switch, a control value storage arithmetic circuit for storing and transferring the set load control value in analog, the load control value transferred from the control value storage arithmetic circuit, and the first to Nth Each of the resistor banks corresponding to the resistor bank and the power capacity are compared and subtracted from the first to the Nth sequential calculation, and the digital signal calculated by the calculation is associated with the corresponding one of the digital signals. A controller having a comparison operation transfer circuit that transfers to the switch and executes opening and closing, and an analog value that changes the load control value in an increasing direction with respect to the load control value set and held in the control value storage operation circuit And a push button switch having a DOWN button for transmitting an analog value for changing the load control value in a decreasing direction. It is in use.

  The second feature of the device of the present invention is that each of the first to Nth resistor banks of the resistor bank group in the first feature of the device of the present invention has a total maximum power capacity of 2 based on a binary system. The present invention employs a configuration of a low-pressure load calculation control device that holds the power capacity corresponding to 1 to 2n-1 / 1 [n is a natural number].

  A third feature of the device according to the present invention is that the controller according to the first feature of the device according to the present invention performs digital display in which the controller can detect the value of the load control value that has been adjusted up and down by the push button switch. The configuration of the low-pressure load calculation control device having a value measuring instrument is employed.

  A fourth feature of the device of the present invention is that the divided class number N in the second or third feature of the device of the present invention is seven, and is 1/2, 1/4 of the total maximum power capacity. , 1/8, 1/16, 1/32, 1/64, 1/128, the power capacity of each grade is divided and held to adopt a configuration of a low-pressure load calculation control device.

  According to a fifth feature of the device of the present invention, the resistor bank group in the first, second, or third feature of the device of the present invention includes a resistor bank of a necessary equivalent class among the divided classes N. It is in the configuration adoption of the low-pressure load calculation control device formed in parallel.

  A sixth feature of the device according to the present invention is that the power cable according to the first, second, third, fourth, or fifth feature of the device according to the present invention is placed on the load side across a main circuit breaker that is intermediately connected. The present invention employs a configuration of a low-voltage load calculation control device in which an overcurrent relay and an ammeter are connected, and a ground fault relay and a voltmeter are connected to the power supply side, and an wattmeter is connected across the ammeter and the voltmeter.

  According to the present invention, a combination of a controller having a resistor bank and a comparison transfer operation circuit enables continuous and highly accurate load adjustment with a small number of switches.

  In addition, the automatic selection of the combination of the banks enables the load control value setting to be highly accurate and shortened in time, so that the operation time can be shortened.

  Further, the automation eliminates the need for the operator to perform the selection / combination operation other than the push button switch operation while looking at the digital wattmeter, so that it is possible to eliminate an erroneous operation such as a human error.

  Hereinafter, an example of a low-pressure load calculation control device that is the best mode of the present invention and a low-pressure load calculation control method corresponding thereto will be described in order.

(Example of equipment)
First, the principle of the low-pressure load calculation control device according to the present invention will be described with reference to FIG.

  FIG. 1 is a principle diagram showing the contents of the capacity configuration of the resistor bank α connected to the power supply device G. The concept is the same for both low voltage and high voltage. To explain, in the figure, when there is a resistor bank α having a maximum capacity of 2000 kw, the resistor bank α is divided into seven, and the numbers from the resistor bank α1 of the bank No1 to the resistor bank α7 of the bank No7 are respectively numbered. Represents the state of allocation.

  In this example device, the number of resistor banks α is described as seven. However, the number of resistor banks N is not limited to seven, and the number of resistor banks N can be increased or decreased depending on the situation. is there.

  As shown in Table 1 below, each resistor bank α performs, for example, a grading division of 1/2 in half from the resistor bank α1 to the resistor bank α7 with a maximum capacity of 2000 kW. Specifically, 1000 kw, which is a half of 2000 kw, is resistor bank α1, and 500 kw, which is a half of resistor bank α1, is resistor bank α2. The capacitance value (kw) of 1 is finally obtained, and 15.625 kw, which is a half of the resistor bank α6, finally sets the value of the resistor bank α7 as the minimum value.

  The fractional value is displayed by fitting 1/2 to 1/128 (1 / 2n-1) to the resistor banks α1 to α7 as the value of each resistor bank when the maximum capacity of 2000 kw is set as the reference value 1. At the same time, the integer value is displayed so that the resistor bank α1 as the maximum bank No becomes 64 with the resistor bank α7 as the minimum bank No as the reference value 1, and is used for calculating the load control value.

この場合、ＯＮは１、ＯＦＦは０を指し示し、抵抗体バンクα１〜α７の７組の組合せは、０を含めると１２８パターンの数値を導き出すことができ、各抵抗体バンクのＯＮ／ＯＦＦを組合せることにより、電力制御値の調整が可能となる。

In this case, ON indicates 1 and OFF indicates 0, and 7 combinations of resistor banks α1 to α7 can be derived as 128 patterns by including 0, and ON / OFF of each resistor bank is combined. As a result, the power control value can be adjusted.

Here, the accuracy of the load control value setting by the present apparatus is calculated by dividing the maximum capacity value of 2000 kW by 127 as shown in the following formula 2, to obtain a resolution value of 0.8%.

  Further, an eighth resistor bank α8 may be added in which the resistor bank number N is 8, and by increasing the number of grade divisions, the fractional value is 1/256, that is, the minimum control value is 7.81 kW. Since the resolution is derived to be 0.4%, it becomes possible to set with higher accuracy.

Furthermore, the capacity of the resistor bank α is not limited. For example, it is necessary to increase the maximum capacity to 4000 kW by installing an additional 2000 kW bank worth 1/1 on the large capacity side of the resistor bank. Depending on the situation, a plurality of equivalent resistor banks α may be provided.
In the case of a low pressure, the above set numerical value can be lowered to the low pressure region, and finer fine control can be performed.

  Therefore, referring to FIG. 2, a configuration example of a low-voltage arithmetic control device in which the resistor bank group of FIG. 1 is connected to a power supply device as a load device will be described.

  FIG. 2 is a single-line diagram of the low-pressure load device β1. The low-voltage load device β1 includes a voltmeter V, an ammeter A, a wattmeter P, an overcurrent relay OCR, a ground fault relay GR, and a main circuit breaker CB in the middle of the power cable PC connected to the power supply device G. The load is adjusted by passing through the low-voltage bank group αL branched and connected at the end.

  Here, as shown in FIG. 1 and Table 2 described above, the low-voltage bank group αL is, for example, a maximum power capacity of 2000 kw for the resistor banks α1 to α7 set as Nos. The divided values are assigned, and the resistor banks α1 to α7 are connected to the power supply device G via the low voltage switch CL by the power cable PC.

  Further, with respect to the example in which the controller CV is attached to the low-pressure load calculation control device β1 in FIG. 2, the configuration diagram of the controller CV and push button switch SW shown in FIG. 3 and the configuration of the low-voltage load calculation control device β2 in FIG. The configuration will be described with reference to such a single-line diagram.

  FIG. 3 shows the load control by connecting the controller CV and controller CV for transferring ON / OFF digital signals to the low-voltage switch CL or the high-voltage switch CH respectively interposed in the resistor banks α1 to α7. It is a block diagram of pushbutton switch SW which sets the value of a value.

  As shown in the figure, the controller CV includes a control value storage arithmetic circuit MC that stores a load control value as a load target value in the controller CV, and a digital numerical value that allows visual inspection of the load control value. The control value measuring device MV that displays the memory, the load control value stored in the control value storage arithmetic circuit MC and the power capacity of the resistor bank α of each grade are automatically repeated, and the load control value is maximized. A comparison operation transfer circuit OC for deriving a selective combination of ON / OFF of the resistor banks α1 to α7 for calculating close values and actually transferring and controlling the resistor banks α1 to 7 as ON / OFF digital signals is provided. To do. In addition, a button or switch (not shown) may be used as a trigger for starting the comparison operation.

  Here, the comparison operation transfer circuit OC has first to Nth operation circuits corresponding to the division number N of the resistor bank α of each grade, and the load control received from the control value storage operation circuit MC. The value is compared and calculated from No. 1 to No. N and transferred as an ON / OFF digital signal.

  Further, the push button switch SW is provided with an UP button and a DOWN button, and the controller CV outputs the contact input UP for increasing the target load control value and the contact input DOWN for decreasing the value as an analog output for control. The device CV holds the load control value received from the push button switch SW in the control value storage arithmetic circuit.

  Furthermore, FIG. 4 shows low-voltage load calculation control device examples β2 using the low-voltage resistor bank group αL in which the above-described controller CV and push button switch SW are installed in the low-voltage load calculation control device of FIG.

  As shown in FIG. 4, the resistor bank α having a total maximum power capacity of 2000 kw is divided into seven stages and numbered in half and numbered, and the resistor bank α1 is assigned as the resistor bank α7, and the low voltage switch CL is assigned. An ON / OFF digital signal is connected to each of the seven low-voltage switches CL from the comparison operation transfer circuit OC in the controller CV so as to be transferred.

(Example method)
Next, as an example of this method, the power capacity of each resistor bank using the switches and controllers provided in the resistor banks No. 1 to No. 7 described in the above device example, and the load that is the target value of the load A series of processing procedures of a low-pressure calculation control method that automatically controls ON / OFF of each resistor pair bank by calculating a value closest to the load control value by comparing with the control value will be described.

  First, before the load characteristic test is performed, the value is changed in the increasing / decreasing direction while pressing the UP / DOWN button of the push button switch SW connected to the controller CV, and a load control value as a target value is set. At this time, every time the UP / DOWN button of the push button switch SW is pressed, the change value in the increasing / decreasing direction is directly transferred to the controller CV in analog, and the controller CV receives the UP / DOWN signal every time. The load control value is held in the control value storage arithmetic circuit and digitally displayed with few reading errors on the control value measuring device MV. Therefore, after operation, the value of the wattmeter P and the value of the control value measuring instrument MV can be visually confirmed to confirm normal operation.

  After the load control value is set, if the execution of the comparison operation is prompted by a button or switch (not shown), the control value storage operation circuit MC analog-transfers the load control value set in the comparison operation transfer circuit OC.

  When the comparison operation transfer circuit OC receives the load control value from the control value storage operation circuit MC, the comparison operation transfer circuit OC starts a comparison operation to transfer it as an ON / OFF digital signal to each of the graded resistor banks α1 to α7. .

  The calculation procedure from the first to the seventh grade in the comparison calculation transfer circuit OC corresponding to each resistor bank α1 to α7 is as shown in Table 2, and the load control value as the target value is the one with the larger bank capacity. The load control value is set by repeating the calculation and repeating the addition.

  First, referring to the explanation of high voltage in FIG. 1, in the second calculation, a comparison is made between the control value (load control value) and bank No1, that is, 1000 kW which is a half of 2000 kW. Here, when the control value is 1000 kw or more, the ON digital signal is applied to the switch of bank No. 1 (in the case of low pressure, the low voltage switch CL of FIG. 4 is used), on the contrary, the load control value. If the value is less than 1000 kW, an OFF digital signal is transferred.

  When the digital signal is ON, a half value is subtracted from the load control value, and the calculated value is held as the remaining value 1, and when the digital signal is OFF, the control value itself is held as the remaining value 1. Analog transfer to the second operation.

  Thereafter, as in the first calculation, after the second calculation, ON / OFF output determination from bank No. 1 to bank No. 7 is performed while transferring ON / OFF digital signals as shown in Table 2.

  In this case, it is necessary to output the ON / OFF signal almost simultaneously by completing the cycle from the first calculation to the seventh calculation within about 0.1 seconds.

  Although the best mode of the present invention has been described above, the present invention is not necessarily limited to the above-described means, and can be appropriately modified within the scope of achieving the above-described effects.

It is arrangement | positioning block diagram of the resistor bank concerning the example of the low voltage | pressure load calculation control apparatus of this invention. It is the single wire connection diagram of the resistor bank concerning the example of the low voltage | pressure load calculation control apparatus of this invention. FIG. 3 is an arrangement configuration diagram of a controller and push button switches according to an example of a low-pressure load calculation control device of the present invention. It is the single line connection diagram which installed the controller in the low voltage | pressure load calculation control apparatus concerning the example of the low voltage | pressure load calculation control apparatus of this invention. It is a single wire connection diagram of the conventional dry type high voltage load device, and is a single wire connection diagram showing a configuration example in which resistor banks are combined and divided stepwise.

Explanation of symbols

α, α1, α2, α3, α4, α5, α6, α7, α8 ... resistor bank αL ... low voltage bank group αH ... high voltage bank group β1, β2 ... low voltage load device γ '... high voltage load device G ... power supply device V ... Voltmeter A ... Ammeter P ... Power meter PC ... Power cable GR ... Ground fault relay OCR ... Overcurrent relay CB ... Main circuit breaker CBH ... Main circuit breaker CL for high voltage ... Low voltage switch CV ... Controller OC ... Comparison calculation transfer Circuit MC ... Control value storage arithmetic circuit MV ... Control value measuring instrument SW ... Push button switch

Claims (10)

For the generator load characteristics test, when dividing the resistor bank group into multiple groups, the power capacity of all resistors is divided, assigned, and set to each resistor bank that is gradually reduced from the higher order to the lower order than the comparison calculation. In order to obtain an approximate value of a target value, a low-pressure load calculation control method for automatically adjusting and adding / subtracting the combination of ON / OFF of each resistor bank sequentially from upper to lower grades,
First, after dividing the resistor bank group connected to the power supply device via a power cable into a plurality (2 to N [N is a natural number]), the total maximum power capacity of the resistor bank group is expressed in binary. Based on the power capacity corresponding to 1/2 to 2n-1 1/2, a value that is gradually reduced from upper to lower grades is assigned to each of the divided first to Nth resistor banks,
Next, after setting the load control value as a target value by the control means connected to each resistor bank, the first calculation means in the comparison calculation transfer circuit in the control means corresponds to the first Compare the power capacity held by one resistor bank with the load control value. If the load control value is equal to or greater than the power capacity, the power capacity is subtracted from the load control value and stored as a remaining value. In addition, the remaining value is analog-transferred to the second arithmetic means, and a digital signal indicating the ON state is transferred to the first resistor bank. On the other hand, if the load control value is less than or equal to the power capacity, the load control Analogly transfer the value to the second computing means,
Hereinafter, from the second calculation to the Nth calculation, the remaining value received from the next higher-order calculation means is sequentially compared with the power capacity of the next-lower class resistor bank. If the power capacity of the corresponding resistor bank is equal to or greater than that, the power capacity is subtracted from the remaining value each time, stored as the next lower class remaining value, and the lower remaining value is transferred to the next lower class computing means in analog form. In addition, a digital signal indicating an ON state is transferred to the corresponding resistor bank corresponding to each of the second to Nth arithmetic means, and if the next higher rank residual value is less than or equal to the power capacity, The next higher and lower class remaining values are transferred as analog values to the next lower and higher class arithmetic means as the next lower class remaining values and executed sequentially.
A low-pressure load calculation control method characterized by the above. The load control value is
When the UP button of the push button switch connected to the control means is pressed, the change value in the increasing direction is transferred to the control value storage arithmetic circuit of the control means, and the value held in the control value storage arithmetic circuit is updated and increased. While letting
When the DOWN button of the push button switch is pressed, the change value in the decreasing direction is transferred to the control value storage arithmetic circuit, and the target value is set by updating and decreasing the value held in the control value storage arithmetic circuit. ,
The low-pressure load calculation control method according to claim 1. The divided grade number N is
The total maximum power capacity of the resistor bank group is divided into 7 grades from 1/2 to 1/128 based on the binary system.
The low-pressure load calculation control method according to claim 1 or 2, characterized in that The total maximum power capacity of the resistor bank group is:
Among the divided grades N, a plurality of the same equivalent resistor banks can be arranged side by side to be increased.
The low-pressure load calculation control method according to claim 1, 2, or 3. For the generator load characteristics test, when dividing the resistor bank group into multiple groups, the power capacity of all resistors is divided, assigned, and set to each resistor bank that is gradually reduced from higher to lower grades by comparison. In order to obtain an approximate value of a target load control value, a low-pressure load calculation control device that automatically selects and adjusts the ON / OFF combination of each resistor bank sequentially from the upper rank to the lower rank,
Since the resistor bank is divided into two or more (2 to N [N is a natural number]) by branch connection to the end of the power cable connected to the power supply device, the total power capacity of the resistor bank group is changed from upper to lower grades. A plurality of resistor banks that are sequentially calculated and divided and allocated, and
A switch that is connected to each resistor bank of the resistor bank group and that switches the resistor bank ON / OFF; and
Corresponding to the control value storage arithmetic circuit for storing and transferring the set load control value in analog, the load control value transferred from the control value storage arithmetic circuit, and the first to Nth resistor banks The first to Nth sequential computations for comparing and subtracting each resistor bank and the power capacity are performed, and the digital signal calculated by the computation is transferred to each corresponding switch. A controller having a comparison operation transfer circuit that opens and closes,
An UP button for transmitting an analog value for changing the load control value in the increasing direction with respect to the load control value set and held in the control value storage arithmetic circuit, and an analog value for changing the load control value in the decreasing direction. A push button switch having a DOWN button for transmitting,
A low-pressure load calculation control device characterized by that. Each of the first to Nth resistor banks of the resistor bank group is:
Holding the power capacity corresponding to 1/2 to 2n-1 [n is a natural number] based on the binary system of the maximum power capacity,
The low-pressure load calculation control device according to claim 5, wherein The controller is
A control value measuring instrument that digitally displays the load control value that can be updated and adjusted by the push button switch.
The low-pressure load calculation control device according to claim 5, wherein The divided grade number N is
7 grades, and each grade holds the power capacity of 1/2, 1/4, 1/8, 1/16, 1/32, 1/64, 1/128 of the total maximum power capacity,
The low-pressure load calculation control device according to claim 6 or 7. The resistor bank group is:
Among the divided grades N, a plurality of necessary equivalent grade resistor banks are juxtaposed,
The low-pressure load calculation control device according to claim 5, 6, or 7. The power cable is
Connect an overcurrent relay and ammeter to the load side across the main circuit breaker connected in the middle, and connect a ground fault relay and voltmeter to the power source side, and a wattmeter across the ammeter and the voltmeter. ,
The low-pressure load calculation control device according to claim 5, 6, 7, 8, or 9.

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