CN100485400C - Device for controlling power earthing/under voltage warning and its control method - Google Patents

Abstract

The invention connects all electric wirings needed to carry out control power supply grounding / undervoltage (CPSGU) to device of CPSGU alarm. Sampling voltage, the device of CPSGU alarm processes, analyzes state of CPSGU. After detecting CPSGU, the device of CPSGU alarm sends out signal in high level to drive buzzer alarming.

Description

A kind of control power ground and undervoltage warning device and control method thereof

Technical field

The present invention relates to a kind of locomotive electric cad system protective device and control method thereof, be meant a kind of locomotive control power ground connection and undervoltage warning device and control method thereof specifically, be mainly used in the control power ground and undervoltage protection system of various electric locomotives.

Background technology

As electric control system,, generally all need each electrical installation is carried out ground connection in order to guarantee safety.Traditional electric locomotive control circuit adopts active earthing device, will cause accumulator directly to seal in the ground loop when being locomotive ground connection, and employing is multipoint earthing, but this will influence the stability of control system power supply greatly, the phenomenon of the control power supply short circuit that the generation multipoint earthing causes, and it does not possess the undervoltage warning function.Therefore necessary this is improved.The control line under-voltage is reported to the police can provide the sufficient running time to driver and conductor's elimination fault that takes appropriate measures, and avoids causing fault further to enlarge and the accident of unnecessary generation.

Summary of the invention

The objective of the invention is to deficiency at existing electric locomotive control circuit earthing device, a kind of 110V control power ground and undervoltage warning device and control method thereof are proposed, the control power supply is carried out the pre-alarm of single-point grounding, can in time understand the duty of control power supply and carry out in time corresponding maintenance, can prevent because the phenomenon of the control power supply short circuit that multipoint earthing causes.

The objective of the invention is to be achieved through the following technical solutions: the electric wiring of need being controlled power ground and undervoltage warning is all imported a control power ground and a undervoltage warning device, by controlling power ground and undervoltage warning device by voltage is sampled, handled, analysis and Control power ground and under-voltage state, when control power ground and undervoltage warning device detect the control power ground and when under-voltage, control power ground and undervoltage warning device provide high level signal, drive buzzer warning.Control power ground and undervoltage warning device comprise a single-chip microcomputer (PLC), by single-chip microcomputer voltage is sampled, handled, and between the both positive and negative polarity lead of control power supply signal input single-chip microcomputer, be serially connected with ground connection and detect resistance R 1, R2, and also be serially connected with electromagnetic isolation voltage sensor UV1, UV2 between the both positive and negative polarity lead of control power supply signal input single-chip microcomputer, and the electrical nodes that detects between resistance R 1, the R2 ground connection has the earth lead realization to be electrically connected with electrical nodes between electromagnetic isolation voltage sensor UV1, the UV2.And electromagnetic isolation voltage sensor UV1, UV2 will sample, handle for single-chip microcomputer (PLC) in detected magnitude of voltage U1, the U2 input single-chip microcomputer (PLC) respectively.Carry out the computational analysis of harmonic content by sample waveform, judge the ground connection of control loop by pulsation rate and sample voltage value.

This 110V control power ground and undervoltage warning device, its principle is seen accompanying drawing 1, R1, R2 are that ground connection is detected resistance, establish R1 ', R2 ' and are respectively positive and negative line stake resistance over the ground; UV1, UV2 are the electromagnetic isolation voltage sensor, and U1, U2 are respectively the detected magnitude of voltage of sensor UV1, UV2, and R0 is the internal resistance of sensor UV1, UV2.Single-chip microcomputer is sampled, is handled voltage, when device detects the control power ground or when under-voltage, device provides high level signal, the driving buzzer warning.Wherein, grounding alarm is:

(1) when $\mathrm{<figure-callout\; id="1"\; label="U"\; filenames="C200610136883E00091.png"\; state="\{\{state\}\}">U</figure-callout>}1=\frac{R1}{R1+R2}\mathrm{<figure-callout\; id="0"\; label="U"\; filenames="C200610136883E00091.png"\; state="\{\{state\}\}">U</figure-callout>}0,$ $\mathrm{<figure-callout\; id="2"\; label="U"\; filenames="C200610136883E00091.png"\; state="\{\{state\}\}">U</figure-callout>}2=\frac{R2}{R1+R2}\mathrm{<figure-callout\; id="0"\; label="U"\; filenames="C200610136883E00091.png"\; state="\{\{state\}\}">U</figure-callout>}0$ The time, there is not ground connection in 110V control power supply;

(2) the dead ground connection of direct current: the negative or positive electrode dead ground of lead, form dead grounding phenomenon, R1 '=0 or R2 '=0 can appear in this moment, it is the situation of U1=0 or U2=0, single-chip microcomputer output high level signal is through isolating, amplify the inner corresponding electronic component of driving earthing device, the electronic component output signal makes ground lamp change red light into by corresponding green light, shows direct-flow positive pole or minus earth, drives grounding alarm hummer FD1 simultaneously and reports to the police;

(3) direct current swinging earth: when the lead of control power supply formed the swinging earth of not dead ground with the ground virtual connection, if this moment was hypothesis main track ground connection, then basis $\frac{R}{}$ $\frac{1\&prime;R0}{(R1\&prime;+R0)}/\frac{R1R0}{(R1+R0)}=\frac{U1}{\mathrm{<figure-callout\; id="2"\; label="U"\; filenames="C200610136883E00091.png"\; state="\{\{state\}\}">U</figure-callout>}2},$ The critical decision content U1≤C1 of U1+U2=U0 and ground connection * U0, can proper R1 '＜C2 * during R0, earthing device newspaper plus earth, in like manner release when R2 '＜C3 * R0, earthing device newspaper minus earth, this moment, ground lamp changed red light into by corresponding green light, showed direct-flow positive pole or minus earth, drove grounding alarm hummer FD1 simultaneously and reported to the police.

Undervoltage warning is:

(1) device collects the main circuit breaker closure signal, and this moment, single-chip microcomputer (PLC) output high level signal drove undervoltage warning hummer FD2 if the control supply voltage is lower than 110V ± C4 V and duration t1 after second; And under-voltage pilot lamp changes red light into by green light on the warning device panel;

(2) if the control supply voltage is lower than 88V ± C5 V and duration t2 after second, single-chip microcomputer (PLC) output high level signal drives undervoltage warning hummer FD3 and report to the police, and under-voltage pilot lamp changes red light into by green light on the warning device panel;

(3) if the control supply voltage is lower than 77V ± C6 V and duration t3 after second, single-chip microcomputer (PLC) output high level signal drives undervoltage warning hummer FD4 and report to the police, and under-voltage pilot lamp changes red light into by green light on the warning device panel;

(4) the device input control signal is controlled by a switch, and 3 positions 0,1,2 are arranged; 0 is device operate as normal position; When switch put 1, device carried out self check to hummer FD1, FD2, FD3, FD4; When switch seated position 2, device " earth fault " reaches " under-voltage fault " function is isolated.

This Device Testing failure alarm signal can input to the vehicle-mounted microcomputer control system simultaneously, carries out the demonstration of failure message on computer display, realizes redundant fault alarm indication function.(annotate: C1, C2, C3, C4, C5, C6, t1, t2, t3 are constant in the literary composition).

The present invention adopts single-chip microcomputer sample waveform to be carried out the computational analysis of harmonic content, judge the ground connection of control loop by pulsation rate and sample voltage value, thereby the ground connection dead band that device detects is little, sensing range is wide, and its sensitivity, reliability is high and can judge that the control power supply is positive pole or minus earth.Particularly dodge over the ground by air for the electric conductor of system iron, by the insulant surface over the ground the hot ground connection of flashover discharge and system can both play normal warning effect.

This device to control voltage sample judge after, can point out the driver and conductor whether to observe battery charger in operate as normal, whether the charging set automatic switch closes.When the charging set fault, the locomotive control power supply only can rely on accumulator to power, and device is provided with one-level undervoltage warning and secondary undervoltage warning.When control voltage be lower than 88V ± C5V and perdurability t2 after second, when device provided the one-level undervoltage warning, the driver and conductor needed failure judgement reason as early as possible, and takes measures to recover, and after recovering to fail, isolated again.After the every operation failure, should rely on accumulator to keep operation as early as possible, make tractor-trailer train sail out of main track or station parking nearby, avoid hindering the operation of other main track train.Behind device one-level undervoltage warning, as continue to move, control voltage can continue to drop, when voltage be lower than 77V ± C6V and perdurability t3 after second, at this moment, battery tension is in extremely low state, may cause the action of locomotive electric cad system unit exception, the driver and conductor should take urgent measure rapidly, avoids locomotive operation other abnormal conditions to occur.At present, the most of capacity of the accumulator that uses on the locomotive as 100Ah about, after accumulator is full of electricity, basically can keep 2～3 hours power supply of locomotive control operate as normal, the driver and conductor can take corresponding measure according to the early warning signal that this warning device provides, thereby the tremendous economic that can avoid the operation of train obstruction main track to bring is lost and the accident of some unnecessary generations.When grounding alarm appears in device, because the single-point grounding fault can not exert an influence to the operation of locomotive, can continue to keep operation, but must handle after returning section, avoid fault further to enlarge, develop into the serious consequences such as short circuit, equipment and lead scaling loss that the above multipoint earthing fault in two places causes.

Description of drawings

Fig. 1 is a structural representation of the present invention.

Embodiment

Accompanying drawing has provided one embodiment of the present of invention, and the invention will be further described below in conjunction with accompanying drawing.

From accompanying drawing as can be seen, the present invention is a kind of control power ground and undervoltage warning device, need are controlled the electric wiring of power ground and undervoltage warning and all imported a control power ground and a undervoltage warning device, by controlling power ground and undervoltage warning device by voltage is sampled, handled, analysis and Control power ground and under-voltage state, when control power ground and undervoltage warning device detect the control power ground or when under-voltage, control power ground and undervoltage warning device provide high level signal, drive buzzer warning.Control power ground and undervoltage warning device comprise a single-chip microcomputer (PLC), by single-chip microcomputer voltage is sampled, handled, and between the both positive and negative polarity lead of control power supply signal input single-chip microcomputer, be serially connected with ground connection and detect resistance R 1, R2, and also be serially connected with electromagnetic isolation voltage sensor UV1, UV2 between the both positive and negative polarity lead of control power supply signal input single-chip microcomputer, and the electrical nodes that detects between resistance R 1, the R2 ground connection has the earth lead realization to be electrically connected with electrical nodes between electromagnetic isolation voltage sensor UV1, the UV2.And electromagnetic isolation voltage sensor UV1, UV2 will sample, handle for single-chip microcomputer (PLC) in detected magnitude of voltage U1, the U2 input single-chip microcomputer (PLC) respectively.Carry out the computational analysis of harmonic content by sample waveform, judge the ground connection of control loop by pulsation rate and sample voltage value.

This 110V control power ground and undervoltage warning device, its principle is seen accompanying drawing 1, R1, R2 are that ground connection is detected resistance, establish R1 ', R2 ' and are respectively positive and negative line stake resistance over the ground; UV1, UV2 are the electromagnetic isolation voltage sensor, and U1, U2 are respectively the detected magnitude of voltage of sensor UV1, UV2, and R0 is the internal resistance of sensor UV1, UV2.Single-chip microcomputer is sampled, is handled voltage, when device detects the control power ground or when under-voltage, device provides high level signal, the driving buzzer warning.Wherein, grounding alarm is:

(1) when $\mathrm{<figure-callout\; id="1"\; label="U"\; filenames="C200610136883E00091.png"\; state="\{\{state\}\}">U</figure-callout>}1=\frac{R1}{R1+R2}\mathrm{<figure-callout\; id="0"\; label="U"\; filenames="C200610136883E00091.png"\; state="\{\{state\}\}">U</figure-callout>}0,$ $\mathrm{<figure-callout\; id="2"\; label="U"\; filenames="C200610136883E00091.png"\; state="\{\{state\}\}">U</figure-callout>}2=\frac{R2}{R1+R2}\mathrm{<figure-callout\; id="0"\; label="U"\; filenames="C200610136883E00091.png"\; state="\{\{state\}\}">U</figure-callout>}0$ The time, there is not ground connection in 110V control power supply;

(2) the dead ground connection of direct current: the negative or positive electrode dead ground of lead, form dead grounding phenomenon, R1 '=0 or R2 '=0 can appear in this moment, it is the situation of U1=0 or U2=0, single-chip microcomputer output high level signal is through isolating, amplify the inner corresponding electronic component of driving earthing device, the electronic component output signal makes ground lamp change red light into by corresponding green light, shows direct-flow positive pole or minus earth, drives grounding alarm hummer FD1 simultaneously and reports to the police;

(3) direct current swinging earth: when the lead of control power supply formed the swinging earth of not dead ground with the ground virtual connection, if this moment was hypothesis main track ground connection, then basis $\frac{R}{}$ $\frac{1\&prime;R0}{(R1\&prime;+R0)}/\frac{R1R0}{(R1+R0)}=\frac{U1}{\mathrm{<figure-callout\; id="2"\; label="U"\; filenames="C200610136883E00091.png"\; state="\{\{state\}\}">U</figure-callout>}2},$ The critical decision content U1≤C1 of U1+U2=U0 and ground connection * U0, can proper R1 '＜C2 * during R0, earthing device newspaper plus earth, in like manner release when R2 '＜C3 * R0, earthing device newspaper minus earth, this moment, ground lamp changed red light into by corresponding green light, showed direct-flow positive pole or minus earth, drove grounding alarm hummer FD1 simultaneously and reported to the police.

Undervoltage warning is:

(5) device collects the main circuit breaker closure signal, and this moment, single-chip microcomputer (PLC) output high level signal drove undervoltage warning hummer FD2 if the control supply voltage is lower than 110V ± C4V and duration t1 after second; And under-voltage pilot lamp changes red light into by green light on the warning device panel;

(6) if the control supply voltage is lower than 88V ± C5V and duration t2 after second, single-chip microcomputer (PLC) output high level signal drives undervoltage warning hummer FD3 and report to the police, and under-voltage pilot lamp changes red light into by green light on the warning device panel;

If the control supply voltage is lower than 77V ± C6V and duration t3 after second, single-chip microcomputer (PLC) output high level signal drives undervoltage warning hummer FD4 and report to the police, and under-voltage pilot lamp changes red light into by green light on the warning device panel;

(8) the device input control signal is controlled by a switch, and 3 positions 0,1,2 are arranged; 0 is device operate as normal position; When switch put 1, device carried out self check to hummer FD1, FD2, FD3, FD4; When switch seated position 2, device " earth fault " reaches " under-voltage fault " function is isolated.

This Device Testing failure alarm signal can input to the vehicle-mounted microcomputer control system simultaneously, carries out the demonstration of failure message on computer display, realizes redundant fault alarm indication function.(annotate: C1, C2, C3, C4, C5, C6, t1, t2, t3 are constant in the literary composition).

Claims (2)

1, control power ground and undervoltage warning device, need are controlled the electric wiring of power ground and undervoltage warning and all imported a control power ground and a undervoltage warning device, by controlling power ground and undervoltage warning device by voltage is sampled, handled, analysis and Control power ground and under-voltage state, when control power ground and undervoltage warning device detect the control power ground or when under-voltage, control power ground and undervoltage warning device provide high level signal, drive buzzer warning; It is characterized in that: described control power ground and undervoltage warning device comprise a single-chip microcomputer, by single-chip microcomputer voltage is sampled, handle, and between the both positive and negative polarity lead of control power supply signal input single-chip microcomputer, be serially connected with ground connection and detect resistance R 1, R2, and between the both positive and negative polarity lead of control power supply signal input single-chip microcomputer, also be serially connected with electromagnetic isolation voltage sensor UV1, UV2, and detect resistance R 1 ground connection, electrical nodes between the R2 and electromagnetic isolation voltage sensor UV1, electrical nodes between the UV2 has earth lead to realize being electrically connected, and electromagnetic isolation voltage sensor UV1, UV2 is respectively with detected magnitude of voltage U1, sample for single-chip microcomputer in the U2 input single-chip microcomputer, handle, carry out the computational analysis of harmonic content by sample waveform, judge the ground connection of control loop by pulsation rate and sample voltage value.

2, a kind of control power ground and undervoltage warning control method of utilizing described control power ground of claim 1 and undervoltage warning device, it is characterized in that: described control method is divided into grounding alarm and undervoltage warning, and wherein, grounding alarm is:

A. work as $U1=\frac{R1}{R1+R2}U0,$ $U2=\frac{R1}{R1+R2}U0,$ The time, there is not ground connection in 110V control power supply;

B. the dead ground connection of direct current: the negative or positive electrode dead ground of lead, form dead grounding phenomenon, R1 '=0 or R2 '=0 can appear in this moment, it is the situation of U1=0 or U2=0, single-chip microcomputer output high level signal is through isolating, amplify the inner corresponding electronic component of driving earthing device, the electronic component output signal makes ground lamp change red light into by corresponding green light, shows direct-flow positive pole or minus earth, drives grounding alarm hummer FD1 simultaneously and reports to the police;

C. direct current swinging earth: when the lead of control power supply formed the swinging earth of not dead ground with the ground virtual connection, if this moment was hypothesis main track ground connection, then basis $\left(\frac{R1\&prime;R0}{R1\&prime;+R0}\right)/\left(\frac{R1R0}{R1+R0}\right)=\frac{U1}{U2},$ The critical decision content U1≤C1 of U1+U2=U0 and ground connection * U0, can proper R1 '＜C2 * during R0, earthing device newspaper plus earth, in like manner release when R2 '＜C3 * R0, earthing device newspaper minus earth, this moment, ground lamp changed red light into by corresponding green light, showed direct-flow positive pole or minus earth, drove grounding alarm hummer FD1 simultaneously and reported to the police;

Undervoltage warning is:

A. device collects the main circuit breaker closure signal, and this moment, single-chip microcomputer output high level signal drove undervoltage warning hummer FD2 if the control supply voltage is lower than 110V ± C4V and duration t1 after second; And under-voltage pilot lamp changes red light into by green light on the warning device panel;

B. if the control supply voltage is lower than 88V ± C5V and duration t2 after second, single-chip microcomputer output high level signal drives undervoltage warning hummer FD3 and report to the police, and under-voltage pilot lamp changes red light into by green light on the warning device panel;

C. if the control supply voltage is lower than 77V ± C6V and duration t3 after second, single-chip microcomputer output high level signal drives undervoltage warning hummer FD4 and report to the police, and under-voltage pilot lamp changes red light into by green light on the warning device panel;

D. install input control signal and control, 3 positions 0,1,2 are arranged by a switch; 0 is device operate as normal position; When switch put 1, device carried out self check to hummer FD1, FD2, FD3, FD4; When switch seated position 2, device " earth fault " reaches " under-voltage fault " function is isolated;

Wherein, R1, R2 are that ground connection is detected resistance, establish R1 ', R2 ' and are respectively positive and negative line stake resistance over the ground; UV1, UV2 are the electromagnetic isolation voltage sensor, and U1, U2 are respectively the detected magnitude of voltage of sensor UV1, UV2, and R0 is the internal resistance of sensor UV1, UV2.

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