JPS58195423A - Rated current variable controller - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an integrated rated current variable controller that can individually vary the rated current R of a circuit breaker equipped with a multi-circuit electrical trip mechanism.

Conventionally, circuit breakers whose rated current can be varied electronically or mechanically have been constructed as a single unit, with complex circuit configurations and large volumes. However, it often has drawbacks such as high 1lIIK. Furthermore, for temporary construction sites and factory equipment such as distribution boards and cubicles, the rated current of the disconnector must be adjusted according to the load, depending on the progress of construction and changes in factory equipment. Over one circuit of multiple circuits, the current value of the load is ',:,II! , 1 of suitable rated current 1.1. , - It takes time and money to replace it with a disconnection device, and when the VC is too large, it is difficult to protect the load properly. There were many.

The present invention is designed to eliminate such defective sound ranges, and the 3M1FR device is a controller with a detector installed outside the JILLR device.
wag! The rated current of these circuit breakers is designed to collectively control circuit breakers installed in multiple circuits. The purpose is to change the rated current value and protect the load appropriately.

The present invention will be explained in detail below.

FIG. 1 shows one embodiment of wiring for a variable rated current controller of the present invention. 1 is the main earth leakage or disconnection, 2 to 5
is a plurality of molded circuit breakers equipped with an electrical trip device 1111K-! The load circuits of the 1wT devices 2 to 5 are protected from short circuits by the molded circuit breaker itself and the earth leakage breaker 1, and are protected from electric leakage by the earth leakage breaker 1. Reference numerals 6 to 12 indicate current transformers attached to molded circuit breakers 2 to 5, and the number of current transformers is one less than the number of poles of each circuit breaker. Reference numeral 26 denotes a detector, which includes a current transformer signal human power terminal 27, a cutoff signal output element 28, and a power supply element 29;

As illustrated in FIG. 1, in the present invention, since the number of poles of each disconnector in the transformer assembly is minus 1@bottle, the number of poles of each disconnector is set to 1. The number of vessels is reduced, the arrangement is easier, and there is more space.

When the load circuit of the circuit breaker is protected from leakage by the earth leakage breaker, it can be regarded as the sum of the i-phase currents of the 3111fr circuit, in other words, the zero-phase transformation #io. Therefore, the sum of the two-phase currents of a three-wire circuit breaker has the same magnitude as the third phase current, although the polarity is different. Therefore, even if there are two current transformers, the phase current of the third pole to which no current transformer is attached can be measured by electronically calculating the sum of the output signals of two and one transformer.

FIG. 2 shows one embodiment of the electronic switch of the present invention.

Current transformers 6 and 10 are attached to two of the three poles of the circuit breaker. When the electronic switch 35.36 for selecting the voltage of the two current transformer signal input terminals is connected at a certain time division time as shown in FIG. It performs inversion amplification and outputs a voltage proportional to the phase current passing through Kt1@6'. 2), the electronic switch 5
5 selects and connects the current transformer signal input terminal of the current transformer 10 at a certain time division time, the operational amplifier 40 inverts and amplifies the output of the current transformer 10, Outputs a voltage proportional to the current. In FIG. 2, when electronic switch 36 simultaneously selects and connects all the voltages at the current transformer signal input terminals of current transformers 6.10 at different time division times, operational amplifier 40 connects current transformers 6.10 to 6.10. 10 output voltages are simultaneously selected, summed, inverted and amplified, and a third output voltage without a current transformer is used.
Outputs a voltage proportional to the phase current of the pole. If the above three types of connections are selected in a time-divided manner, the phase currents of the three poles of the 3MI# device can be measured.

If a transformer is connected to only one side of a two-pole circuit breaker,
In the above description, this is equivalent to when the output voltage of the current transformer 10 is 0. Therefore, in the connection shown in FIG. 2, the operational amplifier 40 outputs a voltage proportional to the phase current passing through the current transformer 6. When connecting only the current transformer 10 in Fig. 2, the operational amplifier 4
The output of 0 becomes 0. When current transformers 6゜lOt in Fig. 2 are simultaneously selected, added, and inverted amplified, the output of the operational amplifier 40 is equal to the output voltage of the current transformer 6, and the output of the operational amplifier 40 is equal to the phase current flowing through the pole where no current transformer is attached. It is a proportional voltage output. Therefore, if the electronic switch is operated as described above, two-phase current at- can be measured using the 11 m1 current transformer attached to the two-pole circuit breaker.

As described above, the variable rated current controller of the present invention uses a simple circuit to control the phases connected to the same circuit breaker from a current transformer with one fewer poles than the number of poles of the circuit breaker to each pole t15t of the circuit breaker. electric f
It can be obtained, and the effect is great.

According to the present invention, it is sufficient that the load circuit of the controlled circuit breaker is protected from short-circuit current and leakage. The # device may be an earth leakage breaker with a short circuit protection mechanism. The rated tR variable controller of the present invention controls: ··· Full leakage in the load circuit of the circuit breaker! A disconnector is used to protect against electrical leakage, and a safe device is used to prevent electric shock.
1. FIG.
This is an example of wiring for a variable rated current controller that is intended only for a single-phase, two-wire type circuit breaker. 101 is a terminal block, 102 to 10.5 Fi single-phase two-wire type earth leakage breaker, and its load is protected from earth leakage. 106-10
It is a current transformer attached to one pole of the 9Fi earth leakage breaker 102 to 105, and 27 is the current transformer signal input terminal.
8#'i! 29 is a disconnection signal output terminal, 29 is a power supply terminal, and 126 is a detector. Detector 126KP3
The electronic switch that selects and connects the voltage of the current transformer signal input terminal, which is stored in the storage, is configured to select each current transformer only once in sequence. In the case of a single-phase, two-wire type detector, the time divided at each time is three times that of a bead type detector, and the time for one round to measure all sliding electric gt is also three minutes. It becomes -. - There is a maximum value for the delay time that satisfies the overcurrent tripping performance, but in the case of a single-phase, two-wire type detector, the maximum number of Jllll devices that can be collected within the circuit time is 3. This has the advantage of being able to control three times as many objects with one detector.

When the load circuit of multiple single-phase two-wire circuit breakers is protected from leakage by a 3N circuit breaker, the phase of each phase current of the JllW'r circuit breaker, in other words, the zero-phase current R should be regarded as O. I can do it. Therefore, since the magnitude of the phase current of the two poles of a single-phase two-wire 31IwT device is equal, one variable fi''6 per one
Therefore, it is only necessary to measure the phase current t1 (b).

FIG. 4 is a circuit diagram of an embodiment of the detector of the variable rated current controller of the present invention. 6 to 12 are variable flL devices, and 1
8 is an electronic switch that selects and connects the voltage of the transformer signal input terminal 27. 19 is an amplification/filter circuit, 20 is a full-wave rectifier/integrator circuit, 21 is a sample and hold circuit, 22 is a converter, and 23 is a central processing unit. The signal selected by electronic switch 18 is full-wave rectified, inspected for an integer number of cycles at the commercial frequency, and sampled and held. The central processing unit @ 23 reads the held analog voltage [tAD converter 22 and calculates it.
The semiconductor non-contact switch circuit 31 is connected to the circuit breaker 2.
~ Operate the trip coil of 5 and the corresponding Rendankikai!
Go to IIT. Digital overvoltage surrounded by a chain line frame! lll
Fr circuit No. 2 includes an electronic switch 1B, an amplification/filter circuit 19. Full-wave well-aligned integration circuit 20. Sample and hold circuit 21° AD converter 22. It consists of a central processing unit 23.

The central processing unit 23 sequentially selects each sliding conductor R using the electronic switch 18, and when the selection is completed, the process is repeated from the beginning. That is, all phase currents of each phase are selected by the electronic switch 18 for each divided time by time division, and the amplification/filter circuit 19. Full-wave rectifying and integrating circuit 20. The sample and hold circuit 21 performs signal processing,
The AD converter 22 reads the data and performs calculations.

25 is an analog overcurrent R11 disconnection circuit, which constantly monitors the outputs of current transformers 6 to 12, and when the voltage output proportional to phase and RK exceeds a certain value, jl! The mwr signal is sent to the corresponding m disconnector of the disconnectors 2 to 5 through the semiconductor non-contact switch circuit 31. 30ij rated current changeover switch part, a changeover switch (not shown) is controlled by a detector 31
There are as many switches as there are disconnectors, and the changeover switches switch the rated voltage I5t of the analog overcurrent cutoff circuit 25 and the digital overcurrent R cutoff circuit 24 at the same time and for each circuit. 41 is the test equipment Ruri,
Overcurrent circuit test by applying voltage to the secondary side of the current transformer
This is a device for the person in charge to regularly check the operation of the variable rated current controller. The test device and the changeover switch have a locking mechanism, and can be operated only by the department in charge, to prevent the test device from operating inadvertently or the changeover switch from being switched.

The digital overcurrent [3a disconnection circuit 24] requires an integral number of cycles of one open frequency to measure each phase current value.

Therefore, even if the 1° dialysis time by the digital overcurrent cutoff circuit 24 is cut off at the first reading, there is a possibility that it will take one cycle time for the 1j electronic switch 18. Therefore, in response to an overcurrent that requires an operation time of less than -1, the analog overcurrent fLjlI disconnection circuit 25 is used instead of the digital overcurrent ga disconnection circuit 124.
Do I#. Regarding short circuit current, protection is provided by a circuit breaker with a short circuit protection mechanism that protects the load side of each circuit breaker from short circuit current. In this manner, the variable rated current controller of the present invention can protect the circuit against all overcurrent values using the #1IIIr device equipped with a general-purpose electrical trip mechanism.

Digital overcurrent fILjl disconnection circuit 24#i and one full-wave rectifier/integrator circuit 20 perform integration over an integer cycle for reading and reading phase currents, making it resistant to noise.

If an integral type AD converter is used as the AD converter 2-2, it can be made even more resistant to noise. In this way, the digital overcurrent cutoff circuit 24 of the present invention is a circuit that is resistant to noise. In the present invention, as described above, integration is performed during an integer cycle of the commercial frequency, and since the time differs depending on the commercial frequency and number, correction based on the commercial frequency is necessary.

This correction can be easily performed by measuring whether the commercial frequency is 50Hz or 60H2 using the reference oscillation of the central processing unit i23.

Although the control circuit breakers are connected in parallel in the embodiments shown in FIGS. A cascade shutdown can be easily achieved to quickly shut down the device.

Time division switching order of electronic switch of variable rated current controller for three-wire disconnector, for example, left view, middle pole, polarity, and select from the beginning to the end of the circuit breaker for each pole. If K is set as
There is less free time for each circuit breaker than when measuring the phase current fit for each IT device.

As described in claim 4 of the present invention, when a trap control circuit breaker is used that employs a thermal type such as a bimetal or an electromagnetic type such as a plunger as an overcurrent disconnection element, switching is possible. The maximum rated value of the rated current selected by the switch is matched with the rated current value of the corresponding circuit breaker, and when the changeover switch is set to the maximum rated value, the analog overcurrent 3IIM disconnection circuit 25 When the central processing unit selects the current transformer of the corresponding circuit breaker and disables the operation of the corresponding circuit breaker, the digital overcurrent [
1 [By configuring the disconnection circuit 24 so that it does not operate and causing the RWI device j1 to disconnect due to the switching characteristics of the circuit breaker itself, it is possible to use a general circuit breaker with an overcurrent train disconnection element, and to use a switching circuit breaker. The number of switching points of the switch can be increased by one more than the number of switching points of the detector itself.

FIG. 5 is an example of a polygonal line that is the basis of the equation based on the polygonal line approximation of the present invention. The horizontal axis is the appearance Mi from AD conversion
The vertical axis is the addition amount α). xo is the current value of 110% of the rated current value, ("1s Al)
, (X2.A'2) is the intersection of the polygonal lines. In this way, the overcurrent strain can be expressed by a broken layer.

Core t″″″″, t[*51140m, Xo (, -χ
When t<Xt and The addition amount 0L can be found.

If χi exceeds Xo, a circuit breaker must be manufactured as time passes. -If the number is less than KO, then the 11riS will not work. Therefore, XO can be said to be the maximum non-operating current. The maximum dead current of 15tXo is 11o due to manufacturing reasons.

Takes away and maintains small variations.

□ Effect... The central processing unit ILp3 divides the - slow time into full time divisions, and performs one calculation by determining one corresponding sliding electric current fi k IIIJ for each divided time. The operation of the central processing unit will be explained below with reference to one sliding electric current fiK. All measurements are made sequentially for all phase currents of this operating noise.

If the sliding electric current column foot value χi is greater than or equal to the maximum dead voltage tILXo, the addition amount cLi is 110. From the addition amount αi, the cumulative value can be calculated from the previous cumulative value A' -1 using the formula (
Ft''(7'':, -, +-α]'. Cumulative value +, jFi Digital energization flL of the present invention
Initialize to O when the power to the forwarding circuit is turned on. The central processing unit of the digital overcurrent It switching circuit calculates the cumulative value c'b for each phase current, writes it to the memory device RAMK in preparation for the next calculation, and the cumulative value C''' of the calculation result is a constant value. When the limit is exceeded, an escape signal is sent to the corresponding circuit breaker.

When χ is 10 or more, it corresponds to bimetal k, for example, heat storage. On the other hand, χ, 4' is the maximum dead current R
When X o or less, it corresponds to heat radiation if compared to a bimetal. For the non-operating current, the addition amount 0Ls can be found using the constant 4 as follows: 0t=α, i-/1(2).

The minimum value of cumulative [LaSλ is 0 and does not take a negative value.

FIG. 6 is an example of how the cumulative value of 0-1 changes over time. The horizontal axis is time, and the vertical axis is the cumulative value i.

In the section from right = O to T't, a constant sliding voltage recommendation larger than xO is exceeded, and when T is exceeded, the circuit breaker breaks K, so the sliding voltage fIL becomes OK. -6=The addition amount α) in the section from o to T is constant, and 2 is 0L every time this phase current is measured.
increase by . 5Fijllr value, cumulative flL
When 0'i exceeds the cutoff value St, the central processing unit disconnects the circuit breaker ta, so the phase current becomes 0, and the cumulative [L0') is expressed as follows: This can be easily achieved.

11jl The heat dissipation of bimetal differs depending on the current value.
14c, the above constant can be made a function of the non-operating current.

As described above, 1. The variable electric accent value of the present invention can be used to select an appropriate electric accent value according to the load using the switching switch, and since the test equipment is provided, the variable rated current controller can be used. The operating tube can be tested periodically;
Since a locking mechanism is provided on the position C and the changeover switch, there is no need to worry about the test equipment being operated inadvertently or the setting value of the changeover switch being changed. -1, so it is resistant to noise and controlled! When the I-breaker has an overcurrent train disconnection mechanism, the corresponding selector switch's elephant size value t-matches the value of the m# device, so it is normal. It is possible to use a product line switch with an overcurrent line disconnection mechanism, and the number of switching points can be increased by one compared to the number of switching points in the internal circuit, and the earth leakage circuit breaker protects the control line breaker from leakage of all load circuits. □ is not a safe scale, but the number of poles of the J disconnector to be controlled - 0,.

f[! □Installation,, f□Iiyu. Only 7 pieces are required, and there is more space available, especially for single-phase two-wire 3MlllFr
When controlling the device height, it is possible to control a large number of disconnectors, and using the polygonal line and damping bone formula, the overvoltage tripping performance can be easily achieved with a high ellipse fK! J! It is a controller that has features such as the ability to express data, and the cost per circuit is low and it is easy to handle, and its effects are extremely large.

[Brief explanation of drawings]

FIG. 1 is an embodiment of the external wiring of the variable rated current controller of the present invention, and FIG. 1 is an embodiment of the electronic switch of the present invention. FIG. 3 shows an example of the wiring of a variable rated current controller in which only the single-phase, two-wire type AM device described in Section 3 of the patent claim of the present invention is completely symmetrical, and FIG. FIG. 2 is a circuit diagram of an embodiment of a detector of a variable rated current controller. Fifth
The figure is an example of a polygonal line that is the basis of the polygonal line approximation formula of the present invention9, and FIG. 6 is an example of a change in cumulative -ri over time. 6-12...Current transformers 1, 2-5...Made-in circuit breakers. :1 18...Electronic switch, 23...Central processing unit.・：、。 24...Digital overcurrent +511 disconnection, 26...
Detector of variable rated current controller, 27... Current transformer signal input 3111111 child, 30... Changeover switch section, 35
．． 36... electronic switch, 40... operational amplifier,
41...Test device. 102-105...Earth leakage breaker, 106-109...
・Current transformer, 126...Detector of variable rated current limiter for single-phase two-wire system, 25...Analog overcurrent fL#i disconnection circuit. - Igl! 1 Figure G

Claims (1)

[Scope of Claims] 1. A II-numbered 11r device equipped with an electric trip mechanism;
A current transformer detects each phase current of the current transformer, and the output signal of the current transformer is selected by an electronic switch that selects the output in a time-sharing manner, and the output signal is selected by a nine-phase electric current aK ratio. Jl several cycles of the commercial frequency are divided horizontally. Digital overcurrent tILiIA# (b) path has a central processing unit that samples and holds the Il, removes the excess with a MuD converter, calculates the result, and sends a corresponding circuit breaker Kjllr signal when the calculated result exceeds a constant I[t-. The output of the quality control device is constantly monitored, and when the output exceeds a certain value,
Analog overvoltage tIL that includes the corresponding aith device KIIi* signal! ! Open circuit and the analog overvoltage tlL#iI! t
hr circuit and a changeover switch that switches the rated voltage of the digital overcurrent I5t#Iv# circuit simultaneously and for each connection IIF, and the overcurrent control I! ! The central processing unit selects the voltage of the output signal terminal of the current transformer in time division, and selects the voltage of the output signal terminal of the current transformer, and From the value i of the phase current read from 11fc, when the χ sweep is more than 110% of the rated current value fLftiXO, calculate the addition amount α) using the equation based on the folded-point approximation, and find that χ is 19 When the value is less than 1, the previous cumulative value r and the constant are used to tighten the needle using the formula % formula %, and when the cumulative value exceeds the value of one foot,
The rated power variable controller is a central processing unit that outputs a disconnection signal. 2. A three-pole circuit breaker is used as the plurality of circuit breakers. I'd rather be served noodles! Two current transformer signal input terminals are provided for each transformer, and an electronic switch that selects and turns on the voltage of the current transformer signal input terminal is turned on and off at 11 J hours. Weird 1! Select and connect the voltages of the I device signal input terminals individually, and at another time division time, simultaneously select the voltage tubes of the two current transformer signal input terminals of the same I1I transformer, and connect them to the three poles!
112. The variable rated current controller according to claim 111, characterized in that in the case of a 111Fr device, the rated current variable controller is connected in addition so that the phase current of the third pole without a current transformer can be measured. 3.1 The load circuit of a single-phase, two-wire circuit breaker is configured so that it is protected from leakage by an earth leakage breaker, and protected from short circuit current by a V# circuit breaker with a short circuit protection mechanism. The device is connected to one pole of the i1M device. - A variable rated current controller for a first tomb carrier as claimed in claim 1, characterized in that the electronic switch is arranged to select the V* order of each current transformer. No., the circuit breaker has an overcurrent tripping gate structure, and the maximum rated value of the 1 rated current selected by the changeover switch is matched with the rated 4'e value of the corresponding 5IIT circuit, and the changeover switch is set to the maximum rated value. When it happens, we will respond! The analog overvoltage [allr circuit and the digital overvoltage ajl! 2. The variable rated current controller according to claim 1, wherein the rated current variable controller has a 1-% mark so that the disconnection does not occur.