JPH0495321A - Diagnostic apparatus for switch operation - Google Patents

Abstract

PURPOSE:To accurately diagnose the operation of switch equipment and also enable diagnosis using substantially one unit by detecting the operation of contact parting or a controlling electromagnetic switch and the operation of contact parting or the current of the controlling electromagnetic coil using respective independent current sensors, and, when two currents are generated simultaneously, preferring the processing of the electromagnetic coil current generated earlier. CONSTITUTION:A diagnostic unit main body has two insulating amplifiers each of which isolates the current sensor side portion from the micro signal side diagnosing unit main body side portion of switch equipment under large current environment and two comparing circuits connected to the respective insulating amplifiers, and the sets of insulating amplifiers and comparing circuits are each connected to a current sensor so as to constitute an input circuit for a preference circuit. The preference circuit comprises an Ic signal G1 and an Io signal gate G2, both of which are always in such a state that signals can be passed therethrough, and a self-holding circuit H1 which when an Ic signal is passed therethrough holds the signal and opens the gate G2, and a self-holding circuit H2 which when an Io signal is passed therethrough holds the signal and opens the gate G1. Therefore a signal that has arrived at either of the G1, G2 eariler is first output to the gate circuit of the next stage.

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention solves mechanical malfunctions in switching devices 6, such as nitrogen circuit breakers, which perform switching operations using electromagnetic force.
At the time of J operation or opening operation, the closed operation or control or open @I←f' or the self-disconnection is constantly monitored from the Sakasugi of the current flowing in the control electromagnetic coil to prevent malfunctions. The present invention relates to a device for diagnosing opening/closing operation.

[Conventional technology]

In recent years, in order to ensure the reliability of power supply (there is a strong demand for the reliability of Kotto equipment), we constantly monitor the substation equipment during AT operation, catch any signs of failure in advance, and prevent a major accident from occurring. The development of preventive maintenance technology to prevent occurrences and to obtain data for estimating the remaining life of a piece of equipment is being promoted.As an operating energy source for switching equipment that makes up substation equipment.

Depending on the type of equipment being developed, electromagnetic force, pressure IIA air, hydraulic pressure, spring force, etc. are used. In order to control the input and output of these forces, a zi coil is installed in the operating device of the switching equipment, and any At the specified time, a command to operate the 'WL: Ei coil is sent from a distance to operate the opening/closing equipment.

Among the switching equipment that is operated in this way, a malfunction of the circuit breaker is reported by Namame public institutions! Care business operator.

The results of a survey compiled by the Electric Cooperative Research Association, whose members include manufacturers (according to this, 55% of all defects are due to failure to open and failure to open). This shows that there are many mechanical accidents regardless of the type of circuit breaker.From this, in order to reduce the number of accidents involving switching equipment, it is necessary to monitor various measurable quantities during switching operations.
Operation diagnosis that determines whether these quantities are normal or not is extremely effective.

Conventional operation diagnosis methods include, for example, (1) a method of monitoring closing time (ZC) and opening time (to);

(2) Method of monitoring the stroke of a movable contact, (3)
There are methods of monitoring the position of closed poles and the position of open poles. The operation diagnostic device to which the present invention is directed is the above-mentioned +21. +31
Like term (1), which can almost cover the term
This method is based on monitoring the waveform of the electromagnetic coil current.

Figure 7 shows a typical waveform of the molded coil current for closing operation, and
Interlocks with the main contact of the switching device and this main contact. The operating status of the auxiliary switch contact (hereinafter referred to as auxiliary contact) at ground potential is shown. In addition, "operation" means moving the main contact from one position to the next, and "control" means moving the main contact from one position to the next, and "control" means moving the main contact from one position to the next. (or opening) I therefore means energizing or deenergizing. 2 and 1 in the figure
Time tc is the time from when the current in the closing control current coil (hereinafter also referred to as closing operation current) begins to flow until the main contact of the switching device is closed, and 1 hour tc' is the time when the a contact among the auxiliary contacts is closed. Indicates the time until the pole closes. For operation diagnosis while power is being applied, it is difficult to obtain information on when the main contact is closed.
The time tc' obtained from the auxiliary contact is often used.

In addition, in recent years, a method has been adopted that uses electronic components to turn the operating current ON and OFF.In this case, the position of the closed terminal is detected by a position detection contact, and the detection signal is sent to the electronic component. The closing operation current is interrupted. In this case, there is almost no variation in the arcing time when interrupting the current of the electromagnetic coil for closing operation, which has a large inductance, as seen in conventional mechanical switches, and the time Tc until interrupting is used for diagnosis. It can be used as the time of

In FIG. 8, the electromagnetic coil for closing operation is partially short-circuited, and the operating voltage is adjusted at each layer short-circuit rate while changing the ratio of the number of eight layers to the total number of layers in the coil, that is, the short-circuit rate.

The results of determining the relationship between the closing time tc and the duration time Tc of the closing operation current when the voltage is changed to 110 V are shown. tc
It can be seen that Tc and Tc show a proportional relationship with no variation, and that it is possible to diagnose the operation using Tc instead of tc.

FIG. 9 shows an example of the configuration of a conventional operation diagnostic device.

The left side of the figure shows the operation/control circuit for the switching equipment, and the right side of the figure shows the configuration of the operation diagnostic device. When the switch SW1 is closed to close the open-circuit switching device, the input control current is applied from the positive terminal terminal iP of the DC power supply to the b contact 52B among the auxiliary contacts of the switching device, and the S! b contact CYB of i switch,
The current flows through the series resistor SRI for suppressing the closing control current to a predetermined value and the N6 coil CC for closing control, and reaches the negative bus N of the DC power supply. The closing control current at this time is the current sensor S
Detected by l. When the closing stroke of the switching device progresses and the A contact 52A among the auxiliary contacts closes, the operating coil CY of the 1st-stage switch is energized, its B contact CYB opens, and the A contact CYA closes, opening the 1st-stage switch. maintain self. At this time, input '1! The i'l control current is cut off, and the current input from the current sensor S1 to the main body of the operation diagnosis apparatus until this cutoff shows a manual waveform as shown in the top row of the figure. This input waveform is amplified by an isolated amplifier, and the portion slightly larger than a threshold set to prevent noise from entering from the outside is input to the gate circuit through a comparison circuit, and this gate circuit converts the input waveform into a rectangular wave. After that, the counting circuit converts this square wave and the black,
Sampling of the square wave is performed by the AND circuit with the check pulse, and the duration counting progresses. When the input waveform to the comparator circuit becomes less than the threshold value and the output from the counting circuit stops, the number of samplings accumulated in the latch circuit, that is, the duration of the closing control current, is input to the display circuit from the drive circuit. At the same time, whether or not this duration is within the permissible limit is displayed on the display circuit via the determination circuit.

If a reset signal is given to the counting circuit and latch circuit from the outside after a predetermined period of time has passed after the closing control current is cut off,
The operation diagnostic device returns to its initial state. In the figure, MC in the operation/control circuit indicates a tfEt coil for closing operation, for example, a winding of an electromagnet for closing operation.

For diagnosing whether the duration time of the opening 'IItlJ control current is normal or not, another operation diagnostic device body having the same circuit configuration is used.

Figure 10 shows the closing control current and opening control current at a common tK.
This section describes a method for diagnosing operation when measuring using a sensor.

In this case, in order to determine whether the current output from the common current sensor S3 is a closed control current or an open control current, the series resistance in the closed control circuit and the open control circuit is A voltage dividing resistor R is connected between the terminal on the positive electrode bus P side of the DC power supply and the negative electrode bus N of SRI and SR2, respectively.
1 and R2 are connected, and the rectangular wave DC voltage applied to the voltage dividing resistors R1 and R2 at the time of closing or opening is divided into different values VC and VT, respectively, and these divided voltages are applied to the respective comparison circuits. Ds and Dz were input, and the threshold value was set to an intermediate value between Vc and VT. For example (VC
+VT ) /2, for example, a negative polarity voltage is output from the comparator circuit Dt, D! From then on, positive voltages are input to the anode gate and cathode gate numbers of the thyristor, respectively, and an operation diagnosis similar to that shown in Figure @9 is performed. In this case, only one operation diagnostic device is required.

FIG. 11 shows an example of the configuration of a Hall current transformer when the Hall current transformer is used as a common sensor in FIG. 10. In this example, the Hall current transformer is equipped with two windings for applying a magnetic field to the Hall element, one winding is used for closing operation or control tim coil current, and the other winding is used for opening operation. Or the current of the control electromagnetic coil passes through it. Further, when two currents pass through the respective windings, the directions of the magnetic fields applied to the Hall element are the same, so that the output voltage from the Hall element always has the same polarity.

If the values of the closing operation or control current (Ic) and the opening operation or control current (10) are significantly different, the number of turns fle and no of the two windings is IcXnc=IoXn
.

In order to achieve this, the counting start point of the duration of the currents Ic and Io is made to be almost the same for Ic and IO.

[Problem to be Solved by the Invention J] As explained above, conventionally, the current of one coil for closing operation or control and the current of an electromagnetic coil for opening operation or control are detected by separate current sensors. The operation diagnosis device itself is required for each current sensor, and even though the closing and opening operations of the switching device cannot occur at the same time due to the mechanism of the switching device, the operation diagnosis device itself is unnecessary. The disadvantage is that there are many

In addition, in the case where the two currents are detected by a common current sensor, current detection can be done with one current sensor, but on the other hand, the current detected at any given time can be the current of either the closed pole or the open pole. In order to determine whether there is a diagnosing device, an additional circuit is required in addition to the current sensor and the main body of the operation diagnosing device, which has the disadvantage that the diagnosing device as a whole becomes complicated.

The purpose of this invention is to detect the current of a closed pole and open pole power coil using separate ti sensors, so that the main body of the operation diagnostic device is essentially one unit, and that the dynamic current can be detected using a common Even in the case of detection with a current sensor, there is no need for a new additional circuit to determine whether the current detected at any point in time is a closed or open current, and the diagnostic equipment is easy to use. It is an object of the present invention to provide a configuration of an operation diagnostic device in which substantially only one main body is required as in the conventional case.

[Means to solve the problem]

In order to solve the above problems, the present invention does not detect the current of one mother coil for closing operation or control and the current of the electromagnetic coil for opening operation or control using separate current sensors. The operation diagnostic device is equipped with a circuit that prioritizes processing of the electromagnetic coil current that occurs first when the two currents occur simultaneously, and the two currents are detected by a common current sensor. So,
The current sensor is formed by a Hall current transformer having two windings that apply a magnetic field to the Hall element, and the two currents are connected to each winding so that the output voltages of the Hall element have opposite polarities. It shall be a device that allows water to flow through the door.

[Effect]

Due to the operational requirements of power systems, switching equipment must be able to switch to opening operation immediately after closing, and in this case, the opening operation or control current must be maintained for a period of time while the closing operation or control current continues. There are cases where the target becomes 1 and flows. From conventional experience, there is no time interval between the opening operations;
When the switching equipment operates in substantially the same state, the operation of the switching equipment, that is, either the closing speed, the opening speed, or the duration of each of the currents does not become abnormal. The present invention focuses on the fact that if either one of the operation or control flow N1 can be supervised in such a case, it is possible to correctly diagnose whether or not the switching device is in a normal state in terms of operating characteristics. Therefore, by providing a circuit in the diagnostic device that prioritizes the processing of the generated 1! can.

In addition, when detecting two [4] with a common current sensor, the first current sensor is connected to the second winding that provides the magnetic field to the Hall element.
If formed as separate Hall current transformers, the two
! By simply making the current flow through each winding so that the output voltages of the Hall elements have opposite polarities, the detected current at any given time will be Ic on either the closed or open side.
This makes it possible to determine whether or not the current is present, and there is no need for a new additional circuit for the determination, and as in the past, it is possible to use only one operation diagnostic device.

[LOL example]

Figure 1 shows the IL flow of a 1-calm coil for closing operation or control (
An embodiment of the operation diagnostic device is shown in which the Ic) and the II magnetic cocoil current (10) for opening operation or control are detected using separate current sensors.

The main body of the diagnostic device with this configuration has two isolation amplifiers that insulate the current detector under the high voltage and large current ring from the small signal side of the main body of the diagnostic device, and is connected to each of the isolation amplifiers. One pair of isolated amplifier and comparison circuit is connected to one current sensor, and the other pair of isolated amplifier and comparison circuit is connected to the other current sensor to give priority to each. It constitutes the input circuit to the circuit. In each comparison circuit, threshold values Vl and V2 are set corresponding to the currents Ic and Io to prevent noise from entering from the outside. A Hall current transformer is used for each current sensor Sl, 82, and the number of turns of the current transformer winding is set so that the output voltage from the current sensor becomes a value that is easy to process within the diagnostic device. As shown in Fig. 2, the priority circuit includes the Ic signal gate Gl which is always in the through state, and the Io which is always in the through state.
Signal gate G2. A self-holding circuit H1 holds this signal and opens gate G2 when the Ic signal passes, and a self-holding circuit H2F holds this signal and opens gate G2 when the Io signal passes. It is configured.

Therefore, the signal that reaches either gate Gl or G2 of the priority circuit first is output preferentially to the gate circuit at the next stage. Further, the self-holding operation of the self-holding circuit in the priority circuit is used to operate the display circuit of the judgment circuit 9 in response to each prioritized signal (see FIG. 1).

Figure 3 shows Ic when the switchgear opens immediately after closing.
, Io waveforms are shown. IO starts to flow almost simultaneously with the closing of the main contact of the switching device, but there is usually a time difference of 01 seconds or more between the time when Ic starts flowing, and Io(l) due to the self-holding operation of the self-holding circuit in the priority circuit. There is sufficient time to stop !r.If there is no priority circuit, the signal waveform input to the counting circuit will be as shown by Ic+Io, and normal diagnosis will be possible. becomes impossible.

@Figures 4 and 5 respectively show an example of the current sensor configuration according to the present invention when Ic and 10 are detected by a common sensor, and an example of the operation diagnostic device configuration using this current sensor. show.

The current sensor S3 includes an iron core 1 having a gap, 2@ windings 2 and 3 wound around the iron core, and a Hall element 4 inserted into the gap of the iron core 1.

Winding 2 is connected to the closing control electromagnetic coil CC, and winding 3
is connected to the advertising coil TC for opening control. Volume @2
, 3, the winding direction is Ic, Io for each winding.
The directions of the lines of magnetic force generated in the iron core when .

In addition, the number of turns nc and no of windings 2 and 3 are as follows:
A voltage that can be easily processed within the diagnostic device is determined to be output from the Hall element 4, and Ic X nc=Io X
Satisfies the relationship no.

Now, the polarity of the output voltage when Ic flows through the current sensor formed as a Hall current transformer with two windings is positive, and the polarity of the output voltage when Io flows is negative. If the positive polarity output voltage from Ic amplified by the isolation amplifier (Fig. 5) is equal to the threshold value +V
The negative output voltage from IO, which is input to the comparator circuit set to I and amplified by the isolation amplifier, is input to the comparator circuit set to threshold value -2. Then, the waveform portions exceeding the respective thresholds are input to the gate circuit. The output from the comparator circuit is input to the simultaneous I/O determination circuit 1 display circuit, and the original current Ic that caused this input is
, Kashi 9 is shown corresponding to Io.

FIG. 6 shows the operation of each circuit in the operation diagnosis device.

Note that in the diagnostic device shown in FIG. 5, when Ic and 10 become 1 in time, the operation diagnosis is Ic and I.

This is performed on the waveform of the difference in sensor output voltage due to each, and if the number of turns @2 and 3 is set so that the sensor output voltage is approximately equal in magnitude to Ic1ll and Io@, 1 diagnosis is performed. The duration of the waveform detected becomes short, making it impossible to make a correct diagnosis. However, if the conduction field applied to the Hall element is made to be significantly different between Ic and 10, and the Icf-induced interference is made significantly larger than the 6 field due to IO, the duration of shaping the difference in sensor output voltage will be longer than when Ic is used alone. Due to the accuracy of the diagnosis, even a diagnostic device using a common current sensor can have the same function as a diagnostic device using individual sensors.

[Effects of the Invention] As stated above, in the present invention, the current of the electromagnetic coil for closing operation or control and the current of the advertising coil for opening operation or control are detected by separate current sensors. In the case where the detection is performed using
In the case where two currents are detected by a common current sensor, the current sensor is formed as a Hall f current device having two windings that provide a conduction field to the Hall element, and the two currents are detected by the output voltage of the Hall element. Since the device is designed to flow current to each winding with opposite polarity, when the current sensor is individual, the operation diagnosis when switching to open operation immediately after closing can be performed first. This is done by prioritizing the processing of the generated electromagnetic coil current, and it is possible to diagnose the operation of at least one of them, so it is possible to judge the quality of the operation of the other one operating in the same state with a high f[. can be used, and only one diagnostic device is required. Also.

The one that detects two 11LRs with a common current sensor does not require an additional circuit to distinguish between the two currents.
Operation diagnosis can be performed with a single diagnostic device without complicating the diagnostic device, and the design specifications of the current sensor can be set easily.
This also makes it possible to diagnose the operation when switching to opening operation immediately after closing.

[Brief explanation of drawings]

FIG. 1 shows one implementation of the configuration of an operation diagnostic device according to the present invention in which the current of the electromagnetic coil for closing operation or control and the current of the electromagnetic coil for opening operation or control are detected using separate current sensors. Block circuit diagram showing an example, WJ
Figure 2 is a block circuit diagram showing the configuration of the priority circuit in the operation diagnostic device shown in Figure 1, and Figure 3 shows the closing operation current and opening control current when the opening operation is performed immediately after the closing operation, as well as both currents. A waveform diagram showing the time relationship between the waveform of the sum of and the main contact operation. Figure 4 shows the current of the electromagnetic coil for closing operation or control and the current of the electromagnetic coil for opening operation or control detected by a common current sensor. If you do. An explanatory diagram showing an example of a current sensor configuration according to the present invention,
FIG. 5 is a block circuit diagram showing an embodiment of the configuration of an operation diagnosis device for diagnosing the operation of a switching device using the force of a current sensor according to the present invention, and FIG. 6 shows each of the components of the operation diagnosis device shown in FIG. FIG. 7, which is a diagram showing the operation of the circuit, shows an example of the electromagnetic coil current waveform processed by the operation diagnosis device according to the present invention, and the time relationship between this waveform and the operating points of the main contacts and auxiliary contacts of the switching device. The explanatory diagram shown in FIG. 8 shows the closing relation tc and the duration T of the closing operation current at each layer short-circuit rate when the closing operation current coil is partially short-circuited.
A tc-Tc relationship diagram showing an example of the relationship between c and #! using the operating voltage as a parameter. Figure 9 is a diagram showing the current of the terminal coil tR for closing operation or control and the current of the input coil for opening operation or control, together with the configuration of the production/control circuit and the operation of each circuit in the operation diagnostic device, Figure 1O. is for closing operation or control! A circuit diagram showing an example of the configuration of a conventional operation diagnosis device when the current of the magnetic coil and the current of the electromagnetic coil for opening operation or control are detected by a common current sensor. Figure 11 is a circuit diagram showing the operation diagnosis of Figure 10. It is an explanatory view showing an example of composition of a current sensor in an apparatus. CC... Electromagnetic coil for closing operation or control, TC-
゛°One-stage coil for opening operation or control, SL, S2.
S3... Current sensor, 2.3... Winding wire, 4... Hall element. -1\Agent Boatman Iwao Yamaguchi -2, -(n' (G) Figure Figure Figure ○ OOO0Q 0 0 0 .

Claims (1)

[Scope of Claims] 1) The currents of the electromagnetic coil for closing operation or control and the electromagnetic coil for opening operation or control are detected by separate current sensors, and the detected currents are processed respectively to determine whether the current is being applied. An operation diagnostic device for diagnosing whether the opening/closing operation of a switching device is normal or not, and includes a circuit that prioritizes processing of the electromagnetic coil current that occurs first when the two currents occur simultaneously. An operation diagnostic device for opening/closing equipment characterized by: 2) The currents of the electromagnetic coil for closing operation or control and the electromagnetic coil for opening operation or control are detected by a common current sensor, and the detected currents are processed to ensure that the opening/closing operation of the switching equipment under energization is normal. The current sensor is formed as a Hall current transformer equipped with two windings that apply a magnetic field to the Hall element, and the two currents are converted to the output voltage of the Hall element. A device for diagnosing operation of switching equipment, characterized in that the current is applied to each winding so that the polarities are opposite to each other.