KR20130094506A - Control and measurement system having spark free function - Google Patents

Control and measurement system having spark free function Download PDF

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Publication number
KR20130094506A
KR20130094506A KR1020120015809A KR20120015809A KR20130094506A KR 20130094506 A KR20130094506 A KR 20130094506A KR 1020120015809 A KR1020120015809 A KR 1020120015809A KR 20120015809 A KR20120015809 A KR 20120015809A KR 20130094506 A KR20130094506 A KR 20130094506A
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KR
South Korea
Prior art keywords
valve limit
spark
control
current
valve
Prior art date
Application number
KR1020120015809A
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Korean (ko)
Inventor
이민수
김동환
Original Assignee
현대로템 주식회사
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Publication date
Application filed by 현대로템 주식회사 filed Critical 현대로템 주식회사
Priority to KR1020120015809A priority Critical patent/KR20130094506A/en
Publication of KR20130094506A publication Critical patent/KR20130094506A/en

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H1/00—Details of emergency protective circuit arrangements
    • H02H1/04—Arrangements for preventing response to transient abnormal conditions, e.g. to lightning or to short duration over voltage or oscillations; Damping the influence of dc component by short circuits in ac networks
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/001—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection limiting speed of change of electric quantities, e.g. soft switching on or off
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/70—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid
    • H01H33/88—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts
    • H01H33/90—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts this movement being effected by or in conjunction with the contact-operating mechanism
    • H01H2033/906—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts this movement being effected by or in conjunction with the contact-operating mechanism with pressure limitation in the compression volume, e.g. by valves or bleeder openings

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)

Abstract

PURPOSE: A control and measurement system comprising spark prevention function is provided to decrease fire hazard drastically, by preventing spark generation in an explosion-proof area fundamentally. CONSTITUTION: A valve limit (30) controls opening and closing of a valve. The opening and closing are performed by on-off of a contact point. A control and measurement apparatus (10) inputs a control signal. A spark prevention circuit part (20) changes the control signal to a minute level. The spark prevention circuit part transmits operation state of the valve limit to the control and measurement apparatus. [Reference numerals] (10) Control measurement device; (AA) Spark preventing circuit part 1; (BB) Valve limit 1; (CC) Spark preventing circuit part 2; (DD) Valve limit 2; (EE) Spark preventing circuit part 3; (FF) Valve limit 3; (GG) Spark preventing circuit part 9; (HH) Valve limit 9; (II) Spark preventing circuit part 10; (JJ) Valve limit 10

Description

CONTROL AND MEASUREMENT SYSTEM HAVING SPARK FREE FUNCTION}

The present invention relates to a control measurement system having a spark prevention function. More specifically, the present invention has a spark prevention function that can greatly reduce the risk of explosion or fire of flammable gas by inherently preventing the occurrence of sparks at the valve limit installed in explosion-proof areas where explosion risk in various systems The present invention relates to a control measurement system.

Explosion-proof areas are areas where flammable materials may be present, and are classified by Labor Declaration No. 1993-19. Devices that generate ignition sources, such as sparks, to protect against explosions and fires, should be constructed in accordance with gas safety standards. .

1 shows the possibility of an explosion due to sparks occurring at a valve limit without explosion-proof mechanism in a space where flammable gas is present.

In order to prevent this risk, the prior art has dealt with by applying explosion-proof mechanisms in various ways.

2 is a view for explaining a hydraulic pressure control measurement system to which a conventional explosion-proof mechanism is applied.

Referring to Figure 2, the prior art is applied to the explosion-proof mechanism for blocking the spark exposure generated from the valve limit installed in the explosion-proof area, the inlet of the combustible gas, or the metal pipe or explosion-proof reference to block the inlet of the combustible gas electrical wiring Corresponds to this by applying explosion-proof piping according to the standard.

However, according to this conventional method, there is a problem in that the system construction cost and maintenance cost greatly increase.

In other words, the construction cost using explosion-proof valve limit and explosion-proof materials (conduit pipe, wire, etc.) incurs a lot of costs, and if the circuit is changed, the maintenance costs are incurred because the relevant parts cannot be reused and must be removed and rebuilt. There is a problem.

In addition, there is a risk of exposure to combustible gas due to poor airtightness of the explosion-proof structure in the process of use, should always thoroughly manage the explosion-proof equipment, there is a problem that the maintenance cost increases significantly.

The present invention can significantly reduce the risk of explosion or fire of the combustible gas by preventing the generation of a thermal energy source, that is, a spark, which is one of the factors of explosion or fire in the explosion-proof area where there is a risk of explosion or fire of the combustible gas. It is a technical problem to provide a control measurement system with a spark prevention function.

In addition, it is possible to provide a control measurement system having a spark prevention function that can reduce the system construction cost by applying general equipment and general wiring without explosion-proof function and greatly reduce the risk of explosion or fire of flammable gas in the explosion-proof area. It is a technical problem.

It is also a technical problem to provide a control measurement system having a spark prevention function that is advantageous in terms of maintenance by applying general wiring without explosion-proof function.

The control measurement system with a spark prevention function according to the present invention for solving this problem is a valve limit for controlling the opening and closing of the valve by the on-off of the contacts provided therein, The control measuring device for inputting the control signal for controlling the operation of the valve limit and the control signal supplied from the control measuring device is converted to a fine level and supplied to the valve limit, and the operation state of the valve limit is detected It is configured to include a spark prevention circuit portion for transmitting to the control measuring device.

In the control measurement system having a spark prevention function according to the present invention, the spark prevention circuit portion fine control generated by down-converting the control signal supplied from the control measuring device to a fine level for operating the contact of the valve limit A current converter for supplying current to the valve limit, a current detector for detecting an operation state of the valve limit according to whether a sensing current is supplied according to on / off of a contact provided in the valve limit, and the current detector And a state signal output unit for supplying a state signal obtained by up-converting the supplied sensing current to the control measuring device.

In the control measurement system having a spark prevention function according to the present invention, the magnitude of the fine control current supplied by the current converter to the valve limit is set in advance according to an ignition criterion of flammable gas present around the valve limit. It is characterized by having.

In the control measurement system having a spark prevention function according to the present invention, the magnitude of the fine control current supplied by the current converter to the valve limit is a level at which spark does not occur due to on and off of the valve limit. do.

In the control measurement system having a spark prevention function according to the present invention, the current converter, the current sensing unit and the status signal output unit constituting the spark protection circuit is mounted on a printed circuit board, the spark protection circuit is mounted The printed circuit board is housed in a spark prevention circuit accommodating device.

In the control measurement system having a spark prevention function according to the present invention, a plurality of printed circuit boards are stored in a state in which the spark prevention circuit accommodating device is divided into channels, and a plurality of spark protection circuit accommodating devices are provided on the front surface of the spark prevention circuit accommodating device. A valve limit operation state display unit for visually displaying the operation state of the valve limit controlled by each spark prevention circuit unit mounted on the printed circuit board is provided.

According to the present invention, it is possible to greatly reduce the risk of explosion or fire of flammable gas by fundamentally preventing the generation of a heat energy source, that is, a spark, which is one of the factors of explosion or fire in explosion-proof areas where there is a risk of explosion or fire of flammable gas. It can be effective.

In addition, in the related art, there is a problem that the cost increases due to the use of explosion-proof equipment or construction of explosion-proof wiring, but according to the present invention, it is possible to apply general equipment and general wiring without explosion-proof functions except for the spark prevention circuit part. This can reduce costs.

In addition, in the related art, the maintenance cost is increased due to the explosion-proof wiring used for implementing the explosion-proof function, but according to the present invention, since the general wiring can be applied, the maintenance cost is reduced.

1 is a view for explaining the risk of explosion accident in the conventional hydraulic control system.
2 is a view for explaining a hydraulic pressure control measurement system to which a conventional explosion-proof mechanism is applied.
3 is a diagram illustrating a control measurement system having a spark prevention function according to an embodiment of the present invention.
4 is a diagram illustrating an example of a configuration of a spark prevention circuit unit included in an embodiment of the present invention.
5 and 6 are views showing an example of the configuration of the spark protection circuit accommodating device included in an embodiment of the present invention.
7 is a view for explaining an example of a specific operation of the control measurement system having a spark protection function according to an embodiment of the present invention.

Prior to describing the preferred embodiment of the present invention will be described the existing concept of the present invention.

Explosion or fire can be prevented by removing any one of the three elements required to generate an explosion or fire due to the spark of the valve limit, that is, a fuel such as flammable gas, a heat energy source, and oxygen. Existing explosion-proof equipment has implemented an explosion-proof structure using a method of isolating thermal energy from fuel or oxygen, the present invention has implemented an explosion-proof structure as a method of removing the source of thermal energy.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 is a diagram illustrating a control measurement system having a spark preventing function according to an exemplary embodiment of the present invention, and FIG. 4 is a diagram illustrating an example of a configuration of a spark preventing circuit unit included in an exemplary embodiment of the present invention.

3 and 4, a control measurement system having a spark prevention function according to an embodiment of the present invention includes a valve limit 30, a control measurement device 10, and a spark prevention circuit 20. It is configured to include.

The valve limit 30 is a means for controlling the opening and closing of the valve by on-off of a contact provided therein. That is, the valve limit 30 is a component that is installed to recognize the operation of the valve in the plant and when the valve is operated is a device that transmits an open or close signal as an electrical signal to the remote site.

The control measuring device 10 is provided in a central control room located at a remote location. The operator inputs a control signal for controlling the operation of the valve limit 30 and displays the operation state of the valve limit 30 by feedback to the operator. Perform the function to

The spark prevention circuit unit 20 converts the control signal supplied from the control measuring device 10 to a fine level and supplies the valve limit 30 to the valve limit 30, and detects an operation state of the valve limit 30 to control the measuring device 10. Perform the function of sending to. The spark prevention circuit unit 20 prevents the generation of thermal energy source, that is, sparks, generated at the valve limit 30, and between the control measuring device 10 and the valve limit 30 to be compatible with an existing system. Is installed.

For example, as shown in FIG. 4, the spark prevention circuit unit 20 may include a current converter 21, a current detector 22, and a state signal output unit 23.

The current converter 21 supplies the valve limit 30 with the fine control current generated by down converting the control signal supplied from the control measuring device 10 to a fine level for operating the contact of the valve limit 30. Perform the function for

For example, the magnitude of the fine control current supplied by the current converter 21 to the valve limit 30 may be configured to have a preset value according to an ignition criterion of flammable gas present around the valve limit 30. More specifically, it is preferable that the magnitude of the fine control current is a level at which no spark occurs due to the on and off of the contact provided in the valve limit 30.

The current sensing unit 22 is a means for detecting an operating state of the valve limit 30 depending on whether the sensing current is supplied according to the on / off of the contact provided in the valve limit 30. That is, the current sensing unit 22 performs current sensing and a function of transferring the sensing signal to the state signal output unit 23 in order to detect an open or closed contact state of the valve limit 30.

The state signal output unit 23 performs a function of supplying a state signal obtained by up-converting the sensing current supplied from the current sensing unit 22 to the control measuring apparatus 10. For example, the state signal output unit 23 may be configured to convert a sense current into a signal of a direct current 24V to be compatible with the existing control measurement apparatus 10.

Hereinafter, an example of a method in which the spark prevention circuit unit 20 is accommodated will be described with reference to FIGS. 5 and 6.

5 is a view showing the front of the spark protection circuit accommodating device 40, Figure 6 is a view showing the back.

5 and 6, the spark protection circuit accommodating device 40 is a rack case type that can be installed in a 19-inch system rack, and 10 modules per chassis are mounted to limit the valve limit 30. 10 states can be monitored from the front, and the cabling between the valve limit 30 and the control measurement device can be configured to be connected at the rear terminal block of the chassis. Reference numeral 60 denotes a terminal block for cabling with the valve limit 30, reference numeral 70 denotes a terminal block for cabling with the control measuring device 10, and reference numeral 80 denotes a connector for power supply.

For example, the current converting unit 21, the current sensing unit 22, and the state signal output unit 23 constituting the spark preventing circuit unit 20 are mounted on a printed circuit board, and the spark preventing circuit unit 20 is mounted. The printed circuit board may be configured to be housed in the spark preventing circuit accommodating device 40.

In addition, a plurality of printed circuit boards are stored in the spark preventing circuit accommodating device 40 in a state separated by channels, and each spark preventing is mounted on a plurality of printed circuit boards in the front of the spark preventing circuit accommodating device 40. The valve limit operation state display unit 50 for visually displaying the operation state of each valve limit 30 controlled by the circuit unit 20 may be provided. Through such a configuration, the manager can easily grasp the operation state of each valve limit 30.

Hereinafter, an example of a specific operation of the control measurement system having a spark preventing function according to an embodiment of the present invention will be described with reference to FIG. 7.

Referring to FIG. 7, first, in step S10, the process of transmitting the control signal of the DC 24V level for turning on or off the contact point of the valve limit 30 by the control measuring device 10 to the spark prevention circuit unit 20 is performed. do.

Next, in step S20, the current converter 21 provided in the spark prevention circuit unit 20 converts the DC 24V level control signal down to a fine level for operating the contact point of the valve limit 30 to finely control it. A process of generating a current and supplying this fine control current to the valve limit 30 is performed. The magnitude of the fine control current is as large as the energy below the ignition reference of the combustible gas.

Next, in step S30, a process of sensing the operation state of the valve limit 30 is performed based on whether the current sensing unit 22 supplies the sensing current according to the on / off contact of the valve limit 30.

Next, in step S40, the state signal output unit 23 up-converts the sensing current to generate a state signal having a DC 24V level, and transmits the state signal to the control measuring device 10.

Next, in step S50, a process of displaying the state information of the valve limit 30 on the display screen provided in the control measuring device 10 is performed.

As described in detail above, according to the present invention, an explosion of a combustible gas can be prevented by preventing the generation of a thermal energy source, that is, a spark, as one of the elements of an explosion or a fire in an explosion-proof area where there is a risk of an explosion or a fire of a combustible gas. This can greatly reduce the risk of fire.

In addition, in the related art, the cost has been increased due to the use of explosion-proof equipment or construction of explosion-proof wiring, but according to the present invention, except for the spark-protection circuit unit 20, a general apparatus having no explosion-proof function and general wiring may be applied. Because it can reduce the cost.

In addition, in the related art, the maintenance cost is increased due to the explosion-proof wiring used for implementing the explosion-proof function, but according to the present invention, since the general wiring can be applied, the maintenance cost is reduced.

Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims. In addition, it is obvious that any person skilled in the art may make various modifications and imitations without departing from the scope of the technical idea of the present invention.

10: control measuring device
20: spark protection circuit
21: current converter
22: current sensing unit
23: status signal output unit
30: valve limit
40: spark protection circuit enclosure
50: valve limit operation status display

Claims (6)

In the control measurement system with a spark prevention function,
A valve limit for controlling opening and closing of the valve by on-off of a contact provided therein;
A control measuring device for inputting a control signal for controlling the operation of the valve limit; And
And a spark prevention circuit for converting a control signal supplied from the control measuring device into a fine level and supplying the valve to the valve limit, and detecting and transmitting an operation state of the valve limit to the control measuring device. One control measurement system. The method according to claim 1,
The spark prevention circuit portion
A current converting unit for supplying a fine control current generated by down converting a control signal supplied from the control measuring device to a fine level for operating the contact of the valve limit to the valve limit;
A current sensing unit for sensing an operation state of the valve limit according to whether a sensing current is supplied according to on / off of a contact provided in the valve limit; And
And a status signal output unit for supplying a status signal obtained by up-converting the sensed current supplied by the current sensing unit to the control measuring apparatus. The method of claim 2,
And a magnitude of a fine control current supplied by the current converter to the valve limit has a preset value according to an ignition criterion of flammable gas existing around the valve limit. The method of claim 2,
And the magnitude of the fine control current supplied by the current converter to the valve limit is a level at which spark does not occur due to on / off of the valve limit. The method according to claim 1,
The current converting unit, the current sensing unit, and the state signal output unit constituting the spark preventing circuit unit are mounted on a printed circuit board.
And a printed circuit board on which the spark prevention circuit portion is mounted is housed in a spark prevention circuit accommodating device. 6. The method of claim 5,
In the spark prevention circuit accommodating device, a plurality of printed circuit boards are stored in a state in which they are divided into channels.
A valve limit operation state display unit for visually displaying an operation state of a valve limit controlled by each spark prevention circuit unit mounted on a plurality of printed circuit boards is provided on the front surface of the spark prevention circuit accommodating device. Control measurement system with spark protection.
KR1020120015809A 2012-02-16 2012-02-16 Control and measurement system having spark free function KR20130094506A (en)

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KR1020120015809A KR20130094506A (en) 2012-02-16 2012-02-16 Control and measurement system having spark free function

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KR1020120015809A KR20130094506A (en) 2012-02-16 2012-02-16 Control and measurement system having spark free function

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101881517B1 (en) * 2016-05-13 2018-07-25 한국전기안전공사 Device for protection by shutting off the electric energy on the basis of the leakage of the combustible gas concentration

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101881517B1 (en) * 2016-05-13 2018-07-25 한국전기안전공사 Device for protection by shutting off the electric energy on the basis of the leakage of the combustible gas concentration

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