CN111983322B - Metro power supply screen output loop insulation resistance monitoring circuit with switching function - Google Patents
Metro power supply screen output loop insulation resistance monitoring circuit with switching function Download PDFInfo
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- CN111983322B CN111983322B CN202010855112.0A CN202010855112A CN111983322B CN 111983322 B CN111983322 B CN 111983322B CN 202010855112 A CN202010855112 A CN 202010855112A CN 111983322 B CN111983322 B CN 111983322B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/025—Measuring very high resistances, e.g. isolation resistances, i.e. megohm-meters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
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Abstract
The invention discloses an insulation resistance monitoring circuit of an output loop of a subway power supply screen with a switching function, which comprises the following components: the leakage current acquisition module is used for correspondingly connecting the output loop of any one of the subway power supply screens connected with the leakage current acquisition module to the signal input end of the direct current type insulation monitoring relay or the alternating current type insulation monitoring relay; the power supply ends of the direct-current type insulation monitoring relay and the alternating-current type insulation monitoring relay are connected with an external power supply through an input power circuit breaker; the direct-current insulation monitoring relay is used for completing an insulation resistance monitoring function when the output loop of the subway power supply screen belongs to a direct-current loop; the AC type insulation monitoring relay is used for completing the insulation resistance monitoring function when the output loop of the subway power supply screen belongs to an AC loop. The invention can meet the function of monitoring the insulation resistance of the output loop of the subway power supply screen by applying a small amount of insulation monitoring relays, and is convenient for maintenance and management.
Description
Technical Field
The invention relates to the technical field of monitoring of insulation resistance of an output loop of a subway power supply screen, in particular to a monitoring circuit of insulation resistance of an output loop of a subway power supply screen with a switching function.
Background
At present, the subway power supply screen output loop insulation resistance monitoring circuit in the market mainly comprises the following two types:
firstly, an insulating monitoring relay is adopted, and one insulating monitoring relay is configured for each output loop of a subway power supply screen. The technical principle of the scheme is popular and easy to understand, and the disadvantage is that the number of insulation monitoring relays needing to be configured is huge. The output loops in the subway power supply screen are more, the output loops are different from twenty-three paths to sixty-seventy paths, even the station yard is up to 90 paths, if each output loop is provided with an insulation monitoring relay, the required quantity is large, inconvenience is brought to space design, installation, production and wiring, the cost of the subway power supply screen is greatly increased, and social resource waste is caused. Meanwhile, maintenance and management of owners are inconvenient, and user embodiment is poor.
And secondly, monitoring insulation resistance by using a self-designed analog circuit. The technical principle of the scheme is complex, the grounding current needs to be detected, the technical capability is limited, the missing report and the false report can be caused, the structure is complex, the maintenance is inconvenient, the development period is long, and the requirement of rapidly putting the scheme into the market is not met.
Therefore, in view of the shortcomings of the existing insulation resistance monitoring circuit of the output circuit of the subway power supply panel, a new insulation resistance monitoring circuit of the output circuit of the subway power supply panel is urgently needed to be developed so as to solve the technical problems.
Disclosure of Invention
The invention aims at solving the technical defects existing in the prior art and provides an insulation resistance monitoring circuit with a switching function for an output loop of a subway power supply screen.
Therefore, the invention provides an insulating resistance monitoring circuit with a switching function for an output loop of a subway power supply screen, which comprises an input power supply breaker, a direct-current type insulating monitoring relay, an alternating-current type insulating monitoring relay and a leakage current acquisition module, wherein:
the leakage current acquisition module is used for connecting an output loop of any one subway power supply screen, and then connecting the output loop of the subway power supply screen to a signal input end of a direct current type insulation monitoring relay or an alternating current type insulation monitoring relay according to whether the output loop of the subway power supply screen belongs to a direct current loop or an alternating current loop;
the power supply end of the direct-current type insulation monitoring relay is connected with an external power supply through an input power circuit breaker;
the power supply end of the alternating current type insulation monitoring relay is connected with an external power supply through an input power circuit breaker;
the direct-current insulation monitoring relay is used for completing an insulation resistance monitoring function when the output loop of the subway power supply screen belongs to a direct-current loop and is communicated with the output loop of the subway power supply screen;
the AC type insulation monitoring relay is used for completing an insulation resistance monitoring function when the output loop of the subway power supply screen belongs to an AC loop and is communicated with the output loop of the subway power supply screen.
The current acquisition module comprises an input terminal, an auxiliary power supply, a control unit, an execution unit, a communication unit, an output terminal and an alarm terminal, wherein:
the input terminal is used for connecting an output loop of any subway power supply screen;
the auxiliary power supply is respectively connected with the control unit, the execution unit and the communication unit and is used for providing working power for the control unit, the execution unit and the communication unit;
the control unit is respectively connected with the execution unit and the communication unit;
an execution unit connected with the input terminal and the output terminal respectively;
and the control unit is used for controlling the execution unit to connect the output loop of the subway power supply screen connected with the input terminal to the output terminal.
The alarm terminal is used for being connected with an alarm end of the direct-current type insulation monitoring relay or an alarm end of the alternating-current type insulation monitoring relay.
The external power supply is an alternating current 220V power supply.
Compared with the prior art, the technical scheme provided by the invention has the advantages that the structural design is scientific, the number of the insulation monitoring relays can be effectively reduced, the function of monitoring the insulation resistance of the output loop of the subway power supply screen can be met by applying a small number of the insulation monitoring relays, and meanwhile, the alarm information can be uploaded to the monitoring unit of the subway power supply screen, so that the subway power supply screen output loop insulation resistance monitoring circuit is convenient to maintain and manage and has great production practice significance.
Drawings
Fig. 1 is a schematic connection diagram of an insulation resistance monitoring circuit of an output loop of a subway power supply screen with a switching function.
Detailed Description
In order that the manner in which the invention is practiced will be understood more readily, reference is now made to the following detailed description of the invention taken in conjunction with the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the application and not limiting of the application. It should be further noted that, for convenience of description, only the portions relevant to the present application are shown in the drawings.
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
It should be noted that, in the description of the present application, terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and the like indicate directions or positional relationships, which are merely for convenience of description, but do not indicate or imply that the apparatus or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present application.
In addition, it should be noted that, in the description of the present application, unless explicitly specified and limited otherwise, the term "mounted" and the like should be construed broadly, and may be either fixedly mounted or detachably mounted, for example.
The specific meaning of the terms in this application will be understood by those skilled in the art as the case may be.
Referring to fig. 1, the invention provides an insulation resistance monitoring circuit of an output loop of a subway power supply screen with a switching function, which is a circuit capable of effectively reducing the number of insulation monitoring relays when the output loop of the subway power supply screen monitors insulation resistance, and specifically comprises an input power circuit breaker 1, a direct-current insulation monitoring relay 2, an alternating-current insulation monitoring relay 3 and a leakage current acquisition module 4, wherein:
the leakage current collection module 4 is used for connecting an output loop of any subway power supply panel (specifically, manually connecting, if a plurality of output loops of the subway power supply panels exist, manually connecting each output loop in sequence through an input terminal, and sequentially monitoring insulation resistance), and then connecting the output loop of the subway power supply panel to a signal input end (comprising L+ and L-ends) of the direct current type insulation monitoring relay 2 or a signal input end (namely L end) of the alternating current type insulation monitoring relay according to whether the output loop of the subway power supply panel belongs to a direct current loop or an alternating current loop;
in the present invention, the dc type insulation monitoring relay 2 or the ac type insulation monitoring relay 3 is selected and connected in advance by a person depending on whether the actual output power source of the subway power supply panel belongs to the dc circuit or the ac circuit.
The power supply end (comprising an end A1 and an end A2) of the direct-current type insulation monitoring relay 2 is connected with an external power supply (for example, a power supply of Alternating Current (AC) 220V) through an input power circuit breaker 1;
the power supply end (comprising an end A1 and an end A2) of the alternating current type insulation monitoring relay 3 is connected with an external power supply (for example, a power supply of Alternating Current (AC) 220V) through the input power circuit breaker 1;
a dc insulation monitoring relay 2, configured to send a detection signal when the output loop of the subway power supply panel belongs to a dc loop and is connected to the output loop of the subway power supply panel, detect an insulation resistance value of the connected output loop of the subway power supply panel, and complete an insulation resistance monitoring function;
and the AC type insulation monitoring relay 3 is used for sending a detection signal when the output loop of the subway power supply screen belongs to an AC loop and is communicated with the output loop of the subway power supply screen, detecting the insulation resistance value of the communicated output loop of the subway power supply screen and completing an insulation resistance monitoring function.
In the invention, the direct-current type insulation monitoring relay 2 and the alternating-current type insulation monitoring relay 3 can be selected according to the actual output power source type of the subway power source screen, and the direct-current type insulation monitoring relay and the leakage current acquisition module 4 together complete the monitoring function of the insulation resistance of the output loop of the subway power source screen.
In the present invention, in a specific implementation, the leakage current collection module 4 includes an input terminal 5, an auxiliary power supply 6, a control unit 7, an execution unit 8, a communication unit 9, an output terminal 10, and an alarm terminal 11, where:
an input terminal 5 for connecting with an output loop of any one of the subway power supply panels;
an auxiliary power supply 6 respectively connected with the control unit 7, the execution unit 8 and the communication unit 9 and used for providing working power for the control unit 7, the execution unit 8 and the communication unit;
a control unit 7 connected to the execution unit 8 and the communication unit 9, respectively;
an execution unit connected to the input terminal 5 and the output terminal 10, respectively;
a control unit 7 for controlling the execution unit 7 to connect the output loop of the subway power supply panel connected to the input terminal 5 to the output terminal 10.
In the present invention, the output terminal 10 is used to connect the detection terminal (including l+ and L-terminals) of the dc type insulation monitoring relay 2 or the detection terminal (i.e., L terminal) of the ac type insulation monitoring relay.
In the present invention, when there are a plurality of output loops of the subway power supply panels, the leakage current collection module 4 may sequentially gate the output loops of the subway power supply panels one by one, and sequentially communicate the output loops of each subway power supply panel with the insulation monitoring relay, thereby sequentially realizing the insulation resistance monitoring function.
In particular, the alarm terminal 11 is used for connecting the alarm terminal (11 port and 12 port in fig. 1) of the direct current type insulation monitoring relay 2 or the alarm terminal (11 port and 12 port in fig. 1) of the alternating current type insulation monitoring relay 3, and when receiving the alarm signal sent by the direct current type insulation monitoring relay 2 or the alternating current type insulation monitoring relay 3, the alarm terminal forwards the alarm signal to a monitoring unit on a subway power supply screen in real time.
In the present invention, the alarm terminals (11 and 12 in fig. 1) of the dc type insulation monitoring relay 2 are alarm signal output ports of the dc type insulation monitoring relay 2 for outputting a set of all-node signals (including normally open contacts and normally closed contacts), and when the dc type insulation monitoring relay detects an abnormal signal, the node state changes.
In the present invention, the alarm terminals (11 and 12 in fig. 1) of the ac type insulation monitoring relay 3 are alarm signal output ports of the ac type insulation monitoring relay 3 for outputting a set of all-node signals (including normally open contacts and normally closed contacts), and when the ac type insulation monitoring relay detects an abnormal signal, the node state changes.
In the invention, in particular implementation, each output loop of the subway power supply panel is connected to the input terminal 5 of the leakage current acquisition module 4, and for the leakage current acquisition module 4, under the control of the control unit 7, each output loop of the subway power supply panel is sequentially connected to the output terminal 10 by the execution unit 8, and then connected to the direct current type insulation monitoring relay 2 or the alternating current type insulation monitoring relay 3, so as to complete the insulation monitoring function.
In the invention, in particular implementation, when an insulation resistance overrun fault occurs in an output loop of any one subway power supply screen, the direct-current insulation monitoring relay 2 or the alternating-current insulation monitoring relay 3 can give an alarm, and at this time, the alarm terminal 11 of the leakage current acquisition module 4 sends two groups of full-contact signals (namely alarm signals) to a monitoring unit on the subway power supply screen.
In the invention, in particular implementation, when an insulation resistance overrun fault occurs in an output loop of any one subway power supply screen, the direct current type insulation monitoring relay 2 or the alternating current type insulation monitoring relay 3 can give an alarm, and at this time, the communication unit 9 of the leakage current acquisition module 4 is connected with the alarm terminal 11 and is used for uploading alarm information to an external monitoring maintenance system.
In the invention, a DC insulation monitoring relay 2 is used for detecting the insulation resistance value to ground of a DC loop; an ac type insulation monitoring relay 3 for detecting the insulation resistance value to ground of the ac circuit.
In the present invention, the dc type insulation monitoring relay 2 or the ac type insulation monitoring relay 3 is an existing insulation monitoring relay, and has an insulation resistance monitoring function, and is a mature device in the prior art, and will not be described here again.
In particular, the dc-type insulation monitoring relay 2 is a conventional dc-type insulation monitoring relay, and may be, for example: a direct current type insulation monitoring relay of model 3UG4582-1AW30 manufactured by Siemens; the ac type insulation monitoring relay 3 is a conventional dc type insulation monitoring relay, and may be, for example: the model number of Siemens is 3UG4581-1AW30 direct current type insulation monitoring relay.
In order to more clearly understand the technical scheme of the present invention, the working principle of the present invention is described below.
For the present invention, the control unit 7 in the leakage current collection module 4 may preset a control program, specifically: the subway power supply screen output circuit connected to the input terminal 5 is connected to the signal input terminal of the insulation monitoring relay through the execution unit 8.
The leakage current collection module 4 sequentially connects output loops of subway power supply panels connected to the input terminals 5 to the output terminals 10, the output terminals 10 are connected with signal input ends of insulation monitoring relays (the direct current type insulation monitoring relay 2 or the alternating current type insulation monitoring relay 3), the output loops of each subway power supply panel are communicated with the signal input ends of the insulation monitoring relays for a certain time, and in the time that the output loops of each subway power supply panel are communicated with the insulation monitoring relay, the insulation monitoring relay sends detection signals, insulation resistance values of the communicated output loops are detected, and an insulation resistance monitoring function is completed.
For the invention, when the insulation resistance of the output loop of the subway power supply screen is over-limit, the alarm terminal of the leakage current acquisition module sends an alarm signal, and a monitoring unit on the subway power supply screen prompts maintenance personnel after receiving the alarm signal. Meanwhile, the communication unit of the leakage current acquisition module can upload alarm information to the monitoring maintenance system to inform information of a fault loop.
In the present invention, the input terminal 5 is connected to the execution unit 8, and is used for connecting the output circuit of the subway power supply screen to the execution unit 8;
an auxiliary power supply 6 respectively connected with the control unit 7, the execution unit 8 and the communication unit 9 and used for providing working power for the control unit 7, the execution unit 8 and the communication unit 9;
the control unit 7 is respectively connected with the auxiliary power supply 6, the execution unit 8, the alarm terminal 11 and the communication unit 9 and is used for providing a switch control signal for the execution unit 8;
an execution unit 8 connected to the auxiliary power supply 6, the control unit 8, the input terminal 5 and the output terminal 10, respectively, for receiving the switch control signal from the control unit 8, and correspondingly connecting or disconnecting the input terminal 5 and the output terminal 10 according to the switch control signal;
and the communication unit 9 is connected with the control unit 7 and is used for uploading the information of the module (namely the leakage current acquisition module 4) to the monitoring unit on the subway power supply screen.
An output terminal 10 connected to the execution unit 8, for connecting the subway power supply panel output circuit to which the input terminal 5 is connected, to the signal input terminal of an insulation monitoring relay (either the dc-type insulation monitoring relay 2 or the ac-type insulation monitoring relay 3);
and the alarm terminal 11 is connected with the control unit 7 and is used for providing a group of full-node alarm signals for the subway power supply screen through the alarm terminal 11 when the insulation fault is detected by the control unit 7.
In particular, the input terminal 5 may include existing pin receptacles 721-440/001-000 and hole-type connectors 721-110/026-000, such as those available from WAGO, germany.
In particular, the auxiliary power supply 6 may be an existing DC/DC power supply module, for example, a DC/DC power supply module with the model number FM5-24S05 manufactured by new and created square electronics company, beijing.
The control unit 7 is an existing singlechip, for example, a singlechip with the model of STC12C5A08S2 produced by macro-crystal technology;
the execution unit 8 is specifically an existing relay, for example, a power relay with the model of JQX-14FC-2C manufactured by Shanghai permanent-magnet relay factory can be adopted;
in particular implementation, the communication unit 9 is an existing special integrated circuit, and the model of the American letter production is a MAX489CSD line transceiver;
the output terminal 10 may include existing pin sockets 721-446/001-000 and hole type connectors 721-116/026-000, such as those of WAGO brand, germany;
the alarm terminal 11 may include an existing pin receptacle 733-370 and hole type connector 733-110, such as the WAGO brand pin receptacle and hole type connection in Germany.
Compared with the prior art, the subway power supply screen output loop insulation resistance monitoring circuit with the switching function has the following beneficial effects:
1. the number of the insulation monitoring relays in the subway power supply screen is reduced, and the cost is saved. The invention effectively reduces the number of the insulation monitoring relays, and can meet the insulation resistance monitoring function of a plurality of loops by only using one or two insulation monitoring relays, thereby greatly reducing the production cost.
2. The control is more flexible, and false alarm and missing report can be effectively reduced. The control program in the invention is software writing, so that false alarm and missing report are effectively reduced. The control strategy can be conveniently adjusted according to the actual application effect on site, and the availability is high.
3. The circuit is simple, the configuration is flexible, and partial devices are applied to the existing devices, so that the inheritance of the maintenance experience of the user is facilitated.
In summary, compared with the prior art, the insulation resistance monitoring circuit with the switching function for the output loop of the subway power supply screen has scientific structural design, can effectively reduce the number of insulation monitoring relays, can meet the function of monitoring the insulation resistance of the output loop of the subway power supply screen by applying a small number of insulation monitoring relays, can upload alarm information to a monitoring unit of the subway power supply screen, is convenient to maintain and manage, and has great production practice significance.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (3)
1. The utility model provides a take switching function's subway power supply screen output return circuit insulation resistance monitoring circuit which characterized in that, including input power circuit breaker (1), direct current type insulation monitoring relay (2), alternating current type insulation monitoring relay (3) and leakage current collection module (4), wherein:
the leakage current acquisition module (4) is used for connecting an output loop of any one subway power supply screen, and then connecting the output loop of the subway power supply screen to a signal input end of the direct current type insulation monitoring relay (2) or the alternating current type insulation monitoring relay (3) according to whether the output loop of the subway power supply screen belongs to a direct current loop or an alternating current loop;
the power supply end of the direct-current type insulation monitoring relay (2) is connected with an external power supply through an input power circuit breaker (1);
the power supply end of the alternating current type insulation monitoring relay (3) is connected with an external power supply through an input power circuit breaker (1);
the direct-current type insulation monitoring relay (2) is used for completing an insulation resistance monitoring function when the output loop of the subway power supply screen belongs to a direct-current loop and is communicated with the output loop of the subway power supply screen;
an alternating current type insulation monitoring relay (3) for completing an insulation resistance monitoring function when the output loop of the subway power supply screen belongs to an alternating current loop and is communicated with the output loop of the subway power supply screen;
the leakage current collection module (4) comprises an input terminal (5), an auxiliary power supply (6), a control unit (7), an execution unit (8), a communication unit (9), an output terminal (10) and an alarm terminal (11), wherein:
an input terminal (5) for connecting with an output loop of any one subway power supply screen;
the auxiliary power supply (6) is respectively connected with the control unit (7), the execution unit (8) and the communication unit (9) and is used for providing working power for the control unit (7), the execution unit (8) and the communication unit;
the control unit (7) is respectively connected with the execution unit (8) and the communication unit (9);
an execution unit which is respectively connected with the input terminal (5) and the output terminal (10) and is used for receiving a switch control signal sent by the control unit (7) and correspondingly connecting or disconnecting the input terminal (5) and the output terminal (10) according to the switch control signal;
a control unit (7) for controlling the execution unit (8) to connect an output loop of the subway power supply panel connected with the input terminal (5) to an output terminal (10);
an output terminal (10) for connecting with a detection end of the DC type insulation monitoring relay (2) or a detection end of the AC type insulation monitoring relay (3);
the leakage current acquisition module (4) is used for sequentially connecting each output loop of the subway power supply screen to the output terminal (10) by the execution unit (8) under the control of the built-in control unit (7) of the leakage current acquisition module, and then connecting the output loops to the direct-current type insulation monitoring relay (2) or the alternating-current type insulation monitoring relay (3) to complete the insulation monitoring function.
2. The subway power supply screen output loop insulation resistance monitoring circuit with the switching function according to claim 1, wherein an alarm terminal (11) is used for being connected with an alarm end of a direct-current type insulation monitoring relay (2) or an alarm end of an alternating-current type insulation monitoring relay (3).
3. The subway power supply screen output loop insulation resistance monitoring circuit with the switching function according to claim 1, wherein the external power supply is an alternating current 220V power supply.
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| CN202010855112.0A CN111983322B (en) | 2020-08-24 | 2020-08-24 | Metro power supply screen output loop insulation resistance monitoring circuit with switching function |
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| CN202010855112.0A CN111983322B (en) | 2020-08-24 | 2020-08-24 | Metro power supply screen output loop insulation resistance monitoring circuit with switching function |
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| CN111983322B true CN111983322B (en) | 2023-07-04 |
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