JPH0793085B2 - Switch control device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switch control device using a mechanical holding relay such as a latch relay (keep relay) for controlling a switch such as a control slave station for each section switch of a power transmission and distribution system. .

[0002]

2. Description of the Related Art Conventionally, in a power transmission and distribution system, as shown in FIG. 4, for example, for every section switch 2 of a 6.6 KV three-phase A, B, C system 1, a switch 2 is being automatically operated. A control slave station 3 for performing opening / closing control of the device is provided. This control slave station 3 automatically sets the division switch 2 of its own station to the timed closing or open lock depending on the situation immediately before the power failure when the power is restored by the reclosing of the accidental power failure of the system 1, so the mechanical holding relay It is formed by using a latch relay.

Then, the energization of the closing coil 2l of the sectional switch 2 is controlled according to the setting condition of the latch relay, and the energization of the coil 2l is turned on / off to turn the 3 of the sectional switch 2 on.
The phase contacts 2a to 2c are interlocked and controlled to be closed (closed) and opened. By the way, when the left side of the switchgear 2 is the 1 side and the right side is the 2 side, the two phases A and C of the system 1 on the 1st side and the 2nd side are stepped down to, for example, 100V by the control transformers 4 and 5, and the controller power receiving terminal a ₁ of the 1-side station 3, C _1, the 2-side power receiving terminals a _2, is supplied to the C _2.

Since the control slave station 3 selects a system power source on the first side or the second side according to the above setting conditions and controls the energization of the closing coil 2l by the selected power source, conventionally, as shown in FIG.
The relay sequence block 6 for AC operation for directly controlling the section switch 2 and the control block 7 for DC operation for controlling the block 6 are configured as shown in FIG. The two blocks 6 and 7 are formed separately in order to reduce the number of parts of the control block 6 that directly controls the division switch 2 as much as possible and improve the control reliability.

The block 6 has power receiving terminals A ₁ and C ₁
And between A ₂ and C ₂ and the closing coil 2l, the contact portion 8 of the two latch relays 8 and 9 for power source selection and closing control
p, 9p and the normally open contact 10p of the timed closing timer 10 are arranged in series. The contact points 8p and 9p
Have reset side and set side contacts r and s, respectively,
The contacts r and s of the contact portion 8p are connected to the power receiving terminals A ₁ and A _2, and the contact r of the contact portion 9p is connected to the switching piece of the contact portion 8p.

The contact 10p of the timer 10 is the contact 9
When the coil 10l is inserted between the switching piece of p and the closing coil 2l, and the coil 10l is energized by the power source of the switching piece of the contact portion 9p,
The contact 10p is closed after a fixed time, for example, 7 seconds. Further, in order to supply the DC power to the block 7, the power receiving terminal A
The AC input side of the stabilized DC power supply circuit 11 is connected to ₁ , C ₁ and A ₂ , C ₂ and this power supply circuit 11 operates by either of the 1 side and 2 side system power supplies, and the DC output side has, for example, + 5V. DC power supply of + 5V line 12,0V
Output between lines 13.

Next, the block 7 is a latch relay 8, 9
Reset coil Rl of each coil portion 8l, 9l of
It is formed by a drive unit 14 that controls the energization of the set coil Sl and a control circuit unit 15 having a microcomputer configuration.

The drive unit 14 includes coil units 7l and 8l.
Has a drive transistor 16 for each coil Rl, Sl of
The bases of the respective transistors 16 are connected to the line 12 by the respective resistors 17 so as to be on-biased. The base bias of the transistor 16 turns on and off, and the coil portion 8l,
Energization of the respective coils Rl, Sl of 9l is selectively turned off to set the latch relays 8, 9 to reset or set, and the respective contact portions 8l, 9l are switched to the contact r or the contact s. The latch relays 8 and 9 are temporarily connected to the contact portion 8
When the states of 1 and 9l are set, even if the energization of the coil portions 8l and 9l is stopped, the set state is mechanically maintained until the next setting or resetting is performed again.

Further, the control circuit section 15 has a switch control function,
It is provided with a microcomputer 18 having various control functions such as display control function in the slave station and communication control function with the master station in the substation. This computer 18 is operated from the master station during automatic operation, for example, after an accident power failure. When the setting information of the switch control for the power recovery of the reclosing circuit is received through the communication interface 19, the data latch circuit 22 is accessed through the address bus 20 and the address decoder 21, and the setting of the data bus 23 is set in this circuit 22. Give information.

At this time, each switch control terminal of the data latch circuit 22 instantaneously changes its binary level according to the setting information,
Due to this change, the base bias of each transistor 16 of the drive unit 14 is turned on and off, and the latch relays 8 and 9 are reset or set according to the setting information.

Next, the latch relays 8 and 9 are reset,
The opening / closing of the sectional switch 2 based on the combination of sets will be described. In the case of the 1-side closing in which the section switch 2 is closed for a time when the system power is generated on the 1 side of the section switch 2, both the latch relays 8 and 9 are reset and set to the state of FIG.

In this case, when the system power source is generated on one side and power is supplied to the power receiving terminals A ₁ and C ₁ , the coil 10l of the timer relay 10 is energized by the power source of the terminals A ₁ and C ₁ .
After a certain period of time, the contact 10p is closed and the closing coil 2l is energized, and the sectional switch 2 is closed and closed.

In the case of 2-side closing in which the section switch 2 is closed for a time when a system power source is generated on the 2 side of the section switch 2,
The latch relay 8 is set and the latch relay 9 is reset. In this case, when the system power source is generated on the 2 side and power is supplied to the power receiving terminals A ₂ and C ₂ , the section switch 2 is closed for the same period as the power source of the terminals A ₂ and C ₂ .

In the case of the closing prohibition lock for holding the classification switch 2 in the closing prohibition, the latch relay 9 is set.
In this case, the latch relay 8 may be either reset or set, and even if a system power source is generated on the 1st or 2nd side to supply power to the power receiving terminals A ₁ , C ₁ or A ₂ , C ₂ , the latch relay 8 may be set. Power supply to the closing coil 2l is prohibited by the contact portion 9p of 9 and the sectional switch 2 is held open.

Next, the installation and start of operation of the control slave station 3 will be described. First, the control slave station 3 is shipped with the latch relays 8 and 9 set to the above or based on the setting condition of the switch control according to the installed system.

Further, since the system 1 is installed without being interrupted when it is installed on a power pole at the site, the system 1 is kept alive and the section switch 2 is manually kept in a closed state.
Then, the power button (not shown) of the control slave station 3 is pressed to connect the power receiving terminals A ₁ , C ₁ , A ₂ and C ₂ to the transformers 4 and 5, and the connection slave station 3 is supplied with power to operate. It becomes a state.

At this time, since system power is generated on both sides of the division switch 2, the latch relays 8 and 9 are turned on on the 1st side.
Regardless of whether it is set to the two-side closing, the closing coil 2l is energized. Then, the division switch 2 is switched to the automatic operation, and the manual operation is released and held, and thereafter, the division switch 2 is controlled by the control slave station 3.

[0018]

In the case of the conventional control slave station 3 shown in FIG. 5, the latch relays 8 and 9 are mechanically set by the shock during transportation at the time of installation and the shock due to an earthquake after the installation. Since it is used as it is even if it is physically reversed, erroneous control or the like occurs and there is a problem of low reliability.

That is, the state of the latch relay 8 is reversed at the time of installation, and for example, the control slave station 3 is installed and supplied with power while reversing from the setting state of 1 side closing at the time of shipment to 2 side closing.
Immediately after installation, the division switch 2 will be kept in the ON state by manual operation, and the system power will be generated on both sides of it when it is operated.
Even if the section switch 2 is switched to automatic operation, no inconvenience occurs, and reversal of the setting of the latch relay 8 is not detected.

When an accidental power failure occurs in this state and the system power source on the 1st side is restored by reclosing after that, the setting state of the latch relay 8 is reversed, so that the control slave station 3 is operated by the division switch 2 Will not be turned on and system 1 will not be restored.

Further, if the setting of the latch relay 9 is reversed and the closing prohibition lock state is set at the time of installation, the control slave station 3
After the installation, the closing coil 2l is not energized when the section switch 2 is switched to the automatic operation, the mood switch 2 is opened, and a power failure occurs.

Furthermore, when an earthquake or the like occurs during operation after installation and the setting of the latch relay 8 or 9 is reversed, an accidental power failure occurs after that, and for example, even if the system power supply on the one side is restored, the division switching is performed. This causes a situation in which the device 2 is not turned on and the system 1 is not restored.

Then, in the case of a switch control device for various applications in which a mechanical holding relay such as a latch relay is used to control the switch, the same problems as described above occur. INDUSTRIAL APPLICABILITY The present invention automatically returns the mechanical holding relay at power-on and during power feeding to the correct setting state to prevent erroneous control and the like.

[0024]

In order to achieve the above object, in a switch control device of the present invention, a storage unit having a nonvolatile semiconductor memory configuration for holding setting information of a mechanical holding relay, and the holding unit. A setting unit for setting a relay, and the setting unit reads the holding information in the storage unit each time the power is turned on, and performs an initial setting function of initializing the holding relay based on erroneous information; and after the initial setting, A resetting function is provided for monitoring the state of the holding relay every time a fixed period of time elapses, and for resetting the holding relay based on the information when the monitoring result does not match the holding information.

[0025]

In the case of the switch controller of the present invention configured as described above, the correct setting information of the setting conditions is held in the storage section. Then, each time the power is turned on immediately after installation and the power of the apparatus is turned on, the mechanical holding relay is initialized based on the setting information held in the storage unit by the initial setting function of the setting unit.

Therefore, even if the mechanical holding relay is reversed from the original setting state due to a shock during transportation at the time of installation, it is always returned to the correct setting state when the power is turned on to operate. Furthermore, after the power of the device is turned on, the setting function of the setting unit monitors the setting state of the mechanical holding relay at regular intervals, and the result of this monitoring changes the setting state based on the setting information in the storage unit. When the inversion of is detected,
The mechanical holding relay is returned to the state based on the setting information in the storage unit.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment will be described with reference to FIGS. FIG. 1 shows the configuration when applied to the control slave station 3. The difference from the conventional configuration of FIG.
It is point (d).

(A) The latch relays 8 and 9 each have two circuits, and the contacts s of the contact parts 8p 'and 9p' interlocking with the contact parts 8p and 9p are connected to the pull-up resistor 24,
Connected to line 12 via line 25 and switch piece to line 13
Connected to and held at 0V (ground). (B) The control circuit section 15 has two detection input terminals and the contact section 8
Setting detection gate unit 2 connected to contacts s of p'and 9p '
The point where 6 was provided.

(C) The control circuit section 15 has EEPROM, N
Storage unit 2 including a writable non-volatile semiconductor memory such as OVRAM or battery-backed RAM
7 is provided, and correct setting information at the time of shipping is held in the storage unit 27. (D) Instead of the conventional microcomputer 18 of FIG. 5, a microcomputer 28 in which the function of a setting unit for setting the latch relays 8 and 9 is added to the computer 18.
Point.

Then, the latch relays 8 and 9 are reset,
The contacts s of the contact parts 8p 'and 9p' are binary-changed to a high level and a low level by setting, and both contact parts 8p 'and 9p'
The level of the contact s is always taken into the setting detection gate unit 26 and detected. The detection gate unit 26 is accessed by the microcomputer 28 via the address decoder 21, and the information on the detection level of the contact s of both contact units 8p 'and 9p' is used as the setting state information of the latch relays 8 and 9 on the data bus 23. It is taken in by the microcomputer 28 via.

Further, unless the setting information given to the computer 28 via the communication interface 19 is written in the storage unit 27 in advance and is rewritten to new setting information by communication with the master station during operation, for example. The setting information written is held regardless of whether power is supplied to the control circuit unit 15 or not. Next, the microcomputer 28 immediately after the control slave station 3 is installed or immediately after the power of the control slave station 3 is turned on immediately after the first side or the second side of the division switch 2 is restored due to the reclosing after the accident power failure. It is started, and the processing from the start of power-on of FIG. 2 is executed.

After the initial reset of the inside in step S1, the initial setting function of the setting unit of the microcomputer 28 operates, the storage unit 27 is accessed in step S2, and the setting information stored in the storage unit 27 is accessed. Read in. Further, the information read in step S3 is set in the data latch circuit 22, and the driving circuit 1 is set by the latch circuit 22 based on the setting information in the storage unit 27.
Each transistor 16 of No. 4 is instantaneously controlled to turn on and off.

At this time, the latch relays 8 and 9 are initially reset or set by turning on and off the transistors 16. Then, when the initial settings of the latch relays 8 and 9 at the time of power-on are completed, the routine proceeds to step S4 and various controls similar to the conventional one are executed.

Further, when the routine process is started, the resetting function of the setting unit of the microcomputer 28 operates and the monitoring process of FIG. 3 is executed in parallel with the routine process. Then, in order to prevent power failure due to erroneous control, an internal interval timer repeatedly measures a fixed period, for example, 200 msec, shorter than the time (release time) when the sectional switch 2 is turned from the closed state to the open state. At every constant cycle of increasing, step Q1 is passed affirmatively (YES), and the routine goes to step Q2.

At this time, the microcomputer 28 accesses the setting detection gate section 26 via the address bus 20 and the address decoder 21 to obtain information on the detection level of the contact point s of the contact points 8p 'and 9p' of the detection section 26. The data is fetched via the data bus 23 and the current setting states of the latch relays 8 and 9 are read. Further, in step Q3, the storage unit 27
To access the setting information in the storage unit 27.

Then, in step Q4, the current setting states of the latch relays 8 and 9 are compared with the setting conditions based on the setting information of the storage unit 27, and it is detected whether or not the setting of the latch relays 8 and 9 is reversed. . This is to minimize the repetition of resetting of the latch relays 8 and 9 and prevent the deterioration of life.

If the set states of the latch relays 8 and 9 are not reversed, the process returns from step Q4 to step Q1 and the processing from step Q1 is executed. On the other hand, if the setting states of the latch relays 8 and 9 are reversed, the process proceeds from step Q4 to step Q5, and step S3 in FIG.
The latch relays 8 and 9 are set or reset based on the setting information of the storage unit 27 and the latch relays 8 and 9 are reset by the same processing as in. Then, the process returns from step Q5 to step Q1, and the processing from step Q1 is repeated. Therefore, even if the latch relays 8 and 9 are reversed from the shipping state when the control slave station 3 is installed and installed on a telephone pole at the site due to impact during transportation, etc. When the power is turned on, the latch relays 8 and 9 are automatically set to the factory setting state based on the setting information held in the storage unit 27.

Furthermore, after the power is turned on, the states of the latch relays 8 and 9 are monitored at regular intervals, and even if the latch relays 8 and 9 are reversed due to an earthquake or the like, the settings are automatically set based on the setting information in the storage unit 27. Will be returned. Therefore, the erroneous control of the division switch 2 due to the reversal of the states of the latch relays 8 and 9 is reliably prevented, the careless power failure of the system 1 does not occur, and the reliability is improved.

Further, since the storage unit 27 is formed of a rewritable semiconductor memory, if the condition is changed during operation, the contents held in the storage unit 27 may be changed by communication from the master station. There is also an advantage that the setting conditions can be changed very easily.

Further, in the above-mentioned embodiment, the present invention is applied to the control slave station 3 which controls the sectional switch 2 by using the two latch relays 8 and 9, but one or a plurality of mechanical holding relays such as latch relays are used. It is needless to say that the present invention can be applied to various switch control devices that control a switch such as a segment switch using the switch.

[0041]

Since the present invention is configured as described above, it has the following effects. Storage unit 27
The correct setting information of the setting conditions is held in the setting information held in the storage unit 27 by the initial setting function of the setting unit (microcomputer 25) when the device is powered on immediately after installation or the like. The latch relays 8 and 9 are initialized based on the above.

Furthermore, after the power is turned on, the resetting function of the setting unit monitors the states of the latch relays 8 and 9 at regular intervals, and the result of this monitoring reverses the state based on the setting information in the storage unit 27. When detected, the latch relay 8,
9 is reset and returned to the state based on the setting information of the storage unit 27. Therefore, even if the states of the latch relays 8 and 9 are reversed due to a shock during transportation, an earthquake, or the like, the latch relays 8 and 9 are automatically returned to the correct setting state, and reliable switch control without erroneous control can be performed. .

[Brief description of drawings]

FIG. 1 is a block connection diagram of an embodiment of a switch controller according to the present invention.

FIG. 2 is a flowchart for explaining the operation of an initial setting function of the control circuit unit in FIG.

FIG. 3 is a flowchart for explaining the operation of the reset function of the control circuit unit in FIG.

FIG. 4 is an explanatory diagram of a power transmission / distribution system to which the present invention is applied.

FIG. 5 is a block connection diagram of a conventional device.

[Explanation of symbols]

 2 division switch 3 control slave station 8, 9 latch relay 27 storage unit 28 microcomputer forming setting unit

Claims (1)

[Claims] 1. A switch controller for controlling a switch by a mechanical holding relay, comprising: a storage unit having a nonvolatile semiconductor memory configuration for holding setting information of the holding relay; and a setting unit for setting the holding relay. An initial setting function for reading the holding information in the storage unit every time the power is turned on to the setting unit and initializing the holding relay based on the information; and the holding unit every time a predetermined period elapses after the initial setting. A switch control device comprising a resetting function for monitoring the state of a relay and resetting the holding relay based on the information when the monitoring result does not match the holding information.