JPH01130432A - Circuit breaker with self-judgement function - Google Patents

Abstract

PURPOSE:To conduct a prompt failure disposal by outputting an abnormality disposing signal when an abnormal action of an operating means is discriminated. CONSTITUTION:An action detecting means is formed of light emitting diodes LED 1-LED 5, a through hole 8a, light receiving diodes PD 1-PD 5. The detected outputs of light receiving diodes PD 1-PD 5 are sent to a CPU 20 through an I/O port 16. A control current for actuating an operating mechanism 10 is detected by current sensors 12, 12' which are control signal detecting means. Their detected outputs are also sent to the I/O port 16. The CPU 20 discriminates in operation, open phase, and delay of operating speed at the time of breaking as a discriminating means. In such cases, the CPU 20 further acts as a control means to output a trip signal to an I/O port 24. Hence, a prompt trouble judgement is conducted, and also other circuit breakers are used as back-up protective breakers, so that a signal to break other circuit breakers can be output when its own operating mechanism is in trouble.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a circuit breaker, and particularly to determination of malfunction thereof.

[Prior art] Generally, when a circuit breaker is turned on, three phases may not be turned on at the same time due to a malfunction (open phase). In the case of such an open phase, an unbalanced current flows in the power system. There is a problem. In addition, the operating force may remain applied to the operating breaker of a non-operating breaker, and there is a risk of damage to the operating breaker. Therefore, it is necessary to detect that there is an open phase and apply a trip (open phase trip).
is being carried out.

Figures 8 and 9 show circuits for open-phase tripping of circuit breaker shown in "Creating circuit breaker/surge arrester" written by Ushio Oki (Denki University Publishing Bureau), page 148. The contactor 4 is opened and closed by the movement of the operating shaft 8. Operation mechanism 1
0, in the open position of the contact 4, the pallet contact a1 shown in FIG. 9 opens and the pallet contact b1 closes. In the closed position of the contactor 4, the pallet contact al is closed and the pallet contact b1 is open. The above configuration is also provided for the other two phases, and for the second phase, pallet contacts a2 and b2 are provided, and the third Regarding the phase, pallet contacts a3 and b3 are provided (see FIG. 9).

FIG. 9 shows each pallet contact a1, a2. when the contactor 4 is in the open position. a3. bl, b2. The state of b3 is shown. When the contactor 4 is closed by the operation a mechanism 10, the pallet contact a1 of the first phase is closed and the pallet contact b1 is opened, and the same applies to the second and third phases.

Therefore, if all three phases are normally turned on, no current flows through the timer 30 and the contactor 4 remains closed.

When an open phase occurs, the pallet contact b2 of the own phase remains closed. Therefore, current flows through the timer 30, and the contact 47T closes after a predetermined time has elapsed.

As a result, current flows through the trip coil 26, causing an open phase trip.

[Problems to be Solved by the Invention] In the conventional circuit breaker, a timer 30 was used to determine a phase failure, so it took time to detect a phase failure, and the degree of failure could not be determined until the phase failure was detected. There was a problem that caused it to proceed. Furthermore, if the operating mechanism is malfunctioning or inoperable during the cutoff operation, there is a problem in that the condition cannot be improved even if an open phase trip is applied to itself.

・This invention solves the above problems, quickly determines the failure, and uses another breaker as a back-up protection breaker, so that if its own operating mechanism is out of order, the other breaker can be activated. An object of the present invention is to provide a circuit breaker with a self-judgment function that outputs a signal for shutting off a device.

[Means for Solving the Problems] A breaker with a self-judgment function according to the present invention includes an operating means for opening and closing a contact, and an opening/closing control signal outputted to the operating means for opening and closing the contact. control signal detection means for detecting, motion detection means for detecting the operation of the operation means, storage means for storing reference control signals and reference operation member operations, an output of the control signal detection means, an output of the operation detection means; Discrimination means for determining whether or not the operation of the operation means is abnormal by comparing the contents with the contents of the storage means, and when the determination means determines that the operation of the operation means is abnormal, the self On the other hand, the circuit breaker is also provided with a control means for outputting an abnormality processing signal to itself or another circuit breaker during a circuit breaker operation.

[Effect] The contact opens and closes the electric circuit by opening and closing the contact.

The operating means includes, for example, an operating rod and an operating mechanism, and opens and closes the contactor based on an external opening/closing control signal.

The control signal detecting means is, for example, two current sensors provided in a control circuit connected to the operating means, and each current sensor corresponds to a closing operation and a cutting operation, respectively.

Then, by detecting the current by one of the current sensors, it is determined whether the current turning operation is being performed or the cutting operation is being performed. .

The motion detection means detects, for example, the position of a signal generation hole provided in an operation shaft, which is the operation means, and outputs a signal corresponding to the position.

The storage means stores control signals in a normal state and operations of the operating means in a normal state, such as patterns of signals generated by a hole in the operating hole.

The determination means 1, for example, a CPU, compares and calculates the output of the control signal detection means, the output of the operation detection means, and the contents of the storage means, and determines whether or not the operation of the operating means is abnormal.

The control means is the above-mentioned CPU, and the determination means:
When it is determined that the operation of the operating means is abnormal, it outputs a trip signal to itself when it is turned on, and outputs a trip signal to itself when it is cut off to operate the trip coil. Furthermore, when the operating means is out of order or inoperable, and when another breaker is used as a back-up protection breaker, a breaker signal is output to that breaker.

[Embodiment] A breaker with a self-judgment function according to the present invention will be explained using FIG. 1 showing an embodiment thereof.

A breaker with a self-judgment function according to the present invention includes a breaker 2 for opening/closing an electric line 6, a contact 4, an operating shaft 8, an operating mechanism 10, a current sensor 12, 12°, a control circuit 14, an I1
0 baud) 16, 24, RO) 118, CPIJ20,
RAM22, trip coil 26, light emitting diode LE
It has DI-5, photodiode PDI-5, optical transmission conversion section 27.27', and optical fiber connection section 28.28°. The contactor 4 is opened and closed by the movement of the operating mechanism 10, which is an operating means, and the operating shaft 8 connected thereto. Operation $118 has a through hole 8a 0 light emitting diode LED1°LED2. LED3. LED4.
The light emitted from the LED 5 passes through the through hole 8a as the operating shaft 8 moves, and passes through the light receiving diodes PDI, P.
The light is received by O2, PO2, PO2, PO2. That is, in this embodiment, the light emitting diode EDI-
LED5, through hole 8a, photodiodes PDl to PD5
The motion detection means is constituted by:

The detection output of the photodiode PDI-'-PD5 is I1
It is given to the C:PU 20 via the 0 vote 16. On the other hand, a control current for operating the operating mechanism 10 is detected by a current sensor 12.12'' which is a control signal detection means.This detection output is also given to the I10 boat 16 as a 0 discrimination means, and the CPU 20 At the time of shutoff, it is determined whether there is no operation, phase loss, or operation speed delay, and in such cases, it further acts as a v1911 means,
A trip signal is output to the 0 boat 24. (1) The boat 24 outputs a trip command to the backup protection system via the optical transmission conversion section 27, the optical fiber connection section 28, and an optical fiber (not shown). ■10 Boat 16 has a CPU (rsi not shown) of the other breaker when it is used as a back-up protection breaker for another breaker in the same system (rli not shown). ) receives the trip command output by the fiber optic connection 28°
and an optical transmission conversion section 27''.
It is assumed that the current sensor 12 detects the current for the closing operation, and the current sensor 12' detects the current for the cutting operation.

The CPLI 20 controls each section according to a program stored in the ROM 18, which functions as a storage means.

FIG. 7 <a> shows the program stored in the ROM 18 as a flowchart. First, the CPU 20
0 port 16 to store the output from the current sensor 12.12' in the RAM 22 (step Sl), and then similarly store the output from the photodetector diodes PD5 to PDI in the RAM 22 (step 52). )0th order,
In step S3, the control current energization time to is calculated based on the output of the current sensor and the on/off signal. The type of operation is determined based on the type of current sensor (step S4).The case of cutoff will be described below. In addition, the flowchart in the case of input is shown in FIG. 7(b).
Based on the output of I, the operating stroke time T5. τ4. τ3.
T2. Calculate τ1 (step S5).

Here, as shown in FIG. 2, the operation stroke time T50 is #! of normal operation. This is the time from when the cutoff control signal is applied to the contact hole 8a at the contact closed position until the through hole 8a passes in front of the photodetector diode PD5. Moreover, the operation stroke time T40 is
After applying the cutoff control signal to the contact closing position, the through hole 8
This is the time it takes for a to pass in front of the photodetector diode PD4. Operation stroke time T30. The same applies to T2O and T1O. Further, t20 is the normal cutoff operation time.

The above control signal input and calculation (steps 5l-S5) are performed for each phase.

Note that the action and operation in the case of injection in FIG. 7(b) are in the opposite order to that in FIG. 7(a), so explanations thereof will be omitted.

Next, a motion is determined based on the above-described calculated value, type, etc. (step S6). This motion determination will be explained using FIGS. 2 to 6. FIG. 2 shows the operation stroke of the operating shaft 8 and the control current when the cutoff operation is performed normally. In this embodiment, 5%, 25%,
50%, 75%.

95% position P5. P4. P3. P2. A photodetector diode PD5. PO2, PO2,
In case of normal operation with PO2 and PDI installed,
The operation stroke time 750 to τ10 and the normal shutoff operation time t20 are stored in the ROM 18 in advance. In addition, the normal energization time t00 and the required minimum energization time t3 of the control current
(The minimum energization time of the control current necessary to start the operation part 8) is also stored in the imome ROM 18.

A case where the energization time to is insufficient and smaller than the required minimum energization time t3 is shown in FIG. 3. In this case, operation N1
g does not move at all.The CPU 20 detects that the operating rod 8 is not operating because there is no output from the photodetector diode PD5 even after the normal cutoff operation time t20 has elapsed.

In this embodiment, the determination is made based on the normal shutoff operation time t20, but the determination may be made based on other criteria (for example, t20/2).

Next, FIG. 4 shows a case where the start of the operation of the operating shaft 8 is delayed. In this case, the operating stroke times τ5 to T1 are respectively Δt5. compared to the normal case. Δt4. Δt3゜Δt2.
Δt1 is delayed. CPU20c, Δt5~Δt
1 are substantially equal and the cutoff operation time t5 is within twice the normal cutoff operation time t20, it is determined that the U start is delayed.

In Figure @5, even though the control current is flowing, the control rod 8
The CPU 20 indicates that the control current conduction time 10 is longer than the required minimum conduction time t3, and flIIT5 to TLbt during the operation stroke rlRT5 during the normal operation stroke.
If the value is 0 to twice the TIQ or more, it is determined that the device is inoperable.

In addition, as shown in FIG. 6, the operating mechanism 10 may
Indicates a case where the operating speed is delayed. The CPU 20 operates when the energization time to is longer than the required minimum energization time t3 and the operation delay time Δt5 to Δt1 gradually increases (for example, (
It is determined that the operating speed is delayed by τ3-τ2)/(T2O-T2O) or more.

The determination made by the CPU 20 is shown on the next page.

After making the above determination for each phase in step S6, it is determined in step S7 whether or not all three phases are normally shut off. If the shutdown is normal, the process ends. If the shutdown is not normal, step S8. S9. S.I.
At O, it is determined whether the cutoff is impossible, the phase is missing, or the cutoff is uneven. When either judgment is made, the next step S
11', S12', S13'teM
Uden 7M l) 'Minimum energizing time 10 is required
A determination is made as to whether or not it was 3 or more. Here 10≧
In the case of t3 or more, it is determined that the operating mechanism IG has failed, and a trip command is output from the I10 boat 24 to the backup protection breaker (not shown) via the optical transmission converter 27. If tQ<t3, operation al horizontal 10
It is determined that there is an abnormality in the control circuit 14 rather than a failure in the control circuit 14, and a trip command is output to the trip coil 26 from the I10 port 24.

In addition, when this breaker is used as a back-up protection breaker for another breaker (not shown) and a trip command is output from the CPU (not shown) of another breaker, the trip command is the optical fiber connection part 28
The trip command is converted into an electrical signal by the optical transmission converter 27' via the I10 boat 16 and transmitted to the CPU 20. The CPU 20 operates the trip coil 26 based on a predetermined program (flow chart not shown).

[Effects of the Invention] Since the self-judgment function breaker according to the present invention directly detects the operation of the operating means for operating the contact,
As soon as an abnormality occurs, it is possible to accurately detect it and quickly handle the failure, and if its own operating mechanism is malfunctioning, it can send an abnormality processing signal such as a cutoff signal to other circuit breakers. Since the output can be performed accurately and quickly, troubleshooting can be performed quickly when the power is cut off.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a breaker according to an embodiment of the present invention;
Figure 2 is a diagram showing the time chart in the case of normal operation during cutoff, Figure 3, Figure 4, Figure 5, and Figure 6 are diagrams showing the time chart in the case of abnormal operation, fi57 (a) and (b) is a diagram showing a flowchart of the program stored in the ROM 18, Figure tJ8 is a diagram showing the configuration of a conventional circuit breaker, and Figure 9 is a diagram showing a circuit for an open phase trip of the circuit breaker in Figure 8. FIG. 4 is a contact, 8 is an operation socket, 8a is a through hole, 10 is an operation mechanism, 12.12' is a current sensor, 18 is a ROM, 20 is a CPU, 16.24 is an I10 board, 27, 27° are optical transmission Conversion section, 28, 28' is optical fiber connection section, LED
I, LED2. LED3. LED4゜LED5 is a light emitting diode, PDI, PH1, PO2, PO2,
PO2 is a photodiode. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (2)

[Claims] (1) A contact that opens and closes an electric circuit, an operation means for opening and closing the contact, a control signal detection means that detects an opening/closing control signal outputted to the operation means to open and close the contact, and a control signal detection means that detects the operation of the operation means. A motion detecting means to detect, a memory means storing a reference control signal and a reference operation member motion, and a comparison operation between the output of the control signal detecting means and the output of the motion detecting means and the contents of the memory means to detect the operating means. Discrimination means for determining whether or not the operation is abnormal; when the determination means determines that the operation of the operating means is abnormal, A disconnector with a self-judgment function, which is equipped with a control means that outputs an abnormality processing signal to the device. (2) A breaker with a self-judgment function according to claim 1, characterized in that the control means outputs a breaker signal to itself when an abnormality processing signal is received from another breaker. vessel.