CN101350514B - Current-limiting arc-extinguishing shunted exciter tripping type earthing short circuit protection device - Google Patents
Current-limiting arc-extinguishing shunted exciter tripping type earthing short circuit protection device Download PDFInfo
- Publication number
- CN101350514B CN101350514B CN2008100792823A CN200810079282A CN101350514B CN 101350514 B CN101350514 B CN 101350514B CN 2008100792823 A CN2008100792823 A CN 2008100792823A CN 200810079282 A CN200810079282 A CN 200810079282A CN 101350514 B CN101350514 B CN 101350514B
- Authority
- CN
- China
- Prior art keywords
- current
- short circuit
- circuit
- loop
- protection device
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The present invention belongs to the technical field of protecting single-phase grounding short-circuit which results from insulation failure of single-phase and three-phase power consuming equipment in a low-voltage power network, and in particular relates to a current-limiting, arc-eliminating and excitation-dividing tripping type grounding short-circuit protection device. The technical proposal consists of a circuit breaker actuating device, a circuit breaker starting mechanism, and a short-circuit detection actuating mechanism. Because the current or voltage signals which are used for actuating the protection device is not related to the short-circuit current of the original grounding short-circuit loop, the protection device solves the problem of dependence on the fuse for the grounding short-circuit failure in the long term and the problem that the short-circuit switch with current as a parameter can not easily generate the maximum allowable temperature rise (igniting fire) in the loop wire within the protective range, and in particular in the terminal insulating wire of the power consuming equipment, so as to timely cut off the circuit.
Description
Technical field
The invention belongs to the earthing short circuit protection equipment technical field that is used in the low voltage electric network power consumption equipment; relating in particular to a kind of insulation when single-phase or three-phase power consumption equipment hinders when ground short circuit takes place for some reason; can limiting short-circuit current and by the electric arc of its initiation; protection transformer, low voltage electric network, power consumption equipment and the control switch protective device---particularly the electronics amplifier element of aftercurrent action protecting equipment exempts from the impact failure of short circuit current; prevent that fire from taking place, and can reliably disconnect the shunted exciter tripping type earthing short circuit protection device of ground short circuit circuit.
Background technology
Spreading all on the 380V in town and country, the 380V/220V low voltage electric network, be connected with the conductive power consumption equipment of numerous shells---the industrial and agricultural production power consumption equipment is not only arranged, also include the employed power consumption equipments of unit such as living standard of urban and rural population, office of Party, government and army, enterprises and institutions, finance, school, commerce and trade, food and drink, hotel, these power consumption equipments are in the operation use, along with the increase of service time, the insulation meeting of equipment self is aging gradually; Because the overload of improper use or the untimely formation of maintenance, repair will be quickened the process of ageing of insulation; Switching overvoltage and atmosphere (thunder and lightning) the overvoltage weak spot that will cause insulating punctures.Therefore, the outer casing electrification phenomenon that causes owing to apparatus insulated damage happens occasionally, and can cause following hidden danger;
---when human body touches the charging equipment shell with threat to life safety;
---when live part in the power consumption equipment discharges to shell, will be because of ground arc short circuit initiation fire:
In addition, live part in the equipment is when equipment generation ground short circuit, short circuit current will produce electric arc at the contact place of getting loose of the protective wire (PEE or PEN, PES) of apparatus insulated puncture place and connection device---and when the heat that produces when electric arc was enough to ignite on every side combustible and lead self insulant, fire will take place; When contact did not get loose, lasting short circuit current was difficult to make the overcurrent protection switch motion, and the lead of fault loop end also will be difficult to bear the heat that short circuit current produces, and himself insulant is ignited and breaking out of fire.
Thermal effect formula (heat) Q=0.24I by electricity
2Rt as can be known, square being directly proportional of the heat that electric arc and fault loop lead are produced and short circuit current, (the short-circuit loop impedance is less when near apart from transformer apart from the distance dependent of power transformer with faulty equipment and the size of single-line to ground fault electric current is single, then short circuit current is big, otherwise short circuit current is little when far away), also relevant with the earthing mode of low voltage electric network---in TT earthing mode electrical network, the impedance in earth fault loop is bigger, only power ground and equipment ground resistance just reach 10--20Q, so short circuit current is generally between 20--10A; And in TN-C, TN-C-S, TN-S electrical network, single-line to ground fault is exactly the uniline short circuit, and the impedance of fault loop is less, and generally between 0.5--1Q, then short circuit current is between 500--200A.Before the failed shorted electric current failed to make the overcurrent protection switch motion, the heating power P of minimum continuous current (10A) electric arc then can reach 220V * 10A=2200W.And the required lowest power P of the fire that ignites is about between 60--100W.Minimum heating power is 22 times of power of igniting, and the danger coefficient of visible ground short circuit initiation fire is how surprising.
Over past ten years, take place again and again, account for about 30% of fire sum in China town-dweller-rural-family and other public arena electrical fire accidents.In electrical fire, the fire incident that the ground arc short circuit causes accounts for over half again.Therefore, the ground short circuit accident not only exerts an influence to the confession electricity consumption, but also meeting burning apparatus, circuit and initiation fire cause the heavy losses of property and unnecessary casualties for country, collective, individual.
At present, in the TN system of the TT of rural power service system, cities and towns power supply, generally the single-line to ground fault protective device of Shi Yonging have as shown in Figure 1a fuse RD and the short switch of the band short-circuit protection function shown in Fig. 1 b.The action parameter of these two kinds of protective devices all is a current value.For electricity consumption, the disconnection operating current value of its short switch K or the blowout current I ' of fuse RD will escape the starting current and the circuit peak current value of power consumption equipment in order to ensure normal.And the impedance in single-line to ground fault loop is bigger, and short circuit current is less, and therefore, these two kinds of protective devices all are difficult to start reliably short switch K open failure circuit before fire takes place.
Another kind is the widely used final stage aftercurrent action protecting equipment that is made of current transformer TA, electronic circuit amplifier V and tripping coil TQ that is provided with in the control switch of electrical appliance on circuit shown in Fig. 1 c.Its operation principle be utilize residual current Io through current transformer TA with secondary induced current I
2Input electronic circuit amplifier V, I
2The output control signal makes the normally opened contact VK conducting of control after this electronic circuit amplifies, and the final controlling element that tripping coil TQ startup is made of mechanical lock buckle 2 and spring 3 disconnects short switch QF.Though this protective device can play a protective role to the ground short circuit accident, this protective device is in operation and has following shortcoming:
1, when the power consumption equipment generation insulation fault in the TN system, residual current Io can be very big, is Single Phase Metal short circuit current I
d (1)This electric current will produce the harmfulness impact to power supply (coil X1, the X2 of transformer, X3), switch, the circuit of fault loop; To produce the impact of damage property to power consumption equipment and connected tail end line.
2, will produce serious harm to the electronic devices and components that are installed on 3 grades of (1 grade, 2 grades, final stage) aftercurrent action protecting equipment electronic circuit amplifier V in the fault loop.This be because: in the final stage aftercurrent action protecting equipment during normally opened contact VK conducting desired action current be set in a milliampere level (final stage generally is set in about 30mA), and the residual current Io minimum (in the TT system) that is produced during equipment ground also about 10A, maximum (in the TN system) can reach 500A.This residual current is the aftercurrent action protecting equipment desired action current
300--16000 doubly.By the operation principle of current transformer TA as can be known, there are following approximation relation: N in primary circuit electric current and secondary loop current
1i
1≌ N
2i
2Wherein: N
1, N
2For current transformer once, the secondary number of turn, i
1, i
2Be current transformer primary current (i
1=i
o=i
d (1)), secondary current (being the amplifier input current).By following formula as can be known, the I and II number of turn of current transformer is constant, works as i
1Be desired action current I
Δ N300--16000 times the time, i
2The electric current of promptly importing electronic circuit amplifier V also will increase 300--16000 doubly.Just not saying how many amplifiers amplified doubly to input current; only increased 300--16000 input current doubly just be enough to pair amplifier electronic devices and components produce serious harm and impact, will directly influence the life-span of electronic devices and components and the reliability of aftercurrent action protecting equipment function.This also be the forfeiture of operating aftercurrent action protecting equipment defencive function, useful life short main cause.
Summary of the invention
Purpose of the present invention just provides in the time of can causing the ground short circuit accident to the power consumption equipment generation insulation fault on the low voltage electric network (380V, 220V/380V) and plays current limliting, extinguishing arc, prevents fire, the current-limiting arc-extinguishing shunted exciter tripping type earthing short circuit protection device of simple in structure, long service life, reliable in function.
Be exactly total the technical scheme that realizes above-mentioned purpose of the present invention is connected a testing agency between the neutral point of the shell protective wire PE of power consumption equipment and power circuit.
Wherein, realize that first technical scheme that the object of the invention adopted is:
A kind of current-limiting arc-extinguishing shunted exciter tripping type earthing short circuit protection device comprises:
The short switch actuator that constitutes by mechanical lock buckle of control ground short circuit switch;
Control the shunt opening trip coil of described mechanical lock buckle;
Be serially connected with current-limiting resistance and electromagnetic relay between the protective wire PE of the power consumption equipment shell that described short switch is controlled and the power supply neutral point that described shunt opening trip coil is connected, form to detect and trigger the loop, constitute the detection trigger mechanism of described power consumption equipment generation ground short circuit;
One end of described shunt opening trip coil is connected with the power supply neutral point, and the other end is connected with phase line by the normally opened contact of described relay, forms to start the loop, and constitutes the actuating mechanism of described short switch action.
Its additional technical feature is:
Described detection triggers the diode that is in series with unidirectional conducting in the loop;
Described power supply neutral point is the electric connection point on the power supply neutral line.
Realize that second technical scheme that the object of the invention adopted is:
A kind of current-limiting arc-extinguishing shunted exciter tripping type earthing short circuit protection device comprises:
The short switch actuator that constitutes by mechanical lock buckle of control ground short circuit switch;
Be connected in the residual current enlarger between circuit, and the shunt opening trip coil that is used to control described tool snap close, the one end is connected with the power supply neutral point, and the residual current enlarger control switch of the other end through being connected in series is connected with phase line:
Between the protective wire PE of the power consumption equipment shell that described short switch is controlled and power supply neutral point that described shunt opening trip coil is connected, be serially connected with current-limiting resistance; form to detect and trigger the loop, thereby constitute the detection trigger mechanism of described power consumption equipment generation ground short circuit:
One end of described shunt opening trip coil is connected with the power supply neutral point, and the described residual current enlarger control switch of the other end through being connected in series is connected with phase line, forms to start the loop, and constitutes the actuating mechanism of described short switch action.
Its additional technical feature is:
Described detection triggers the diode that is in series with unidirectional conducting in the loop;
Described power supply neutral point is the electric connection point on the power supply neutral line;
Described power supply neutral point is: each phase line is connected in a bit after connecting an electric capacity separately in three phase lines, be connected in a bit after perhaps each phase line in three phase lines connects an inductance separately, this point constitutes described power supply neutral point, and wherein each electric capacity or inductance have identical parameter;
Described residual current enlarger is connected in to constitute and detects between two end points that trigger the loop;
Described residual current enlarger is connected in described detection and triggers between loop and the described startup loop;
Described detection triggers in the loop and is serially connected with relay, and wherein the normally opened contact of this relay and described residual current enlarger control switch are connected in parallel.
In above-mentioned technical scheme: first technical scheme of the present invention compared with prior art has the following advantages:
---in this single-line to ground fault protective device, be provided with the detection trigger mechanism, when adopting ground short circuit, the parameter of its detection detects direct current (or interchange) electric current (or voltage) signal between neutral line N (or N ') and device housings protective wire PE, and the size of this signal and earth short circuit current value is irrelevant, when the signal that detects reaches about definite value, detect trigger mechanism and send instruction, make the normally opened contact JDK closure of electromagnetic relay to actuating mechanism; Actuating mechanism sends instruction to the actuator that opens circuit, and actuator disconnects circuit breaker, thereby realizes the defencive function to single-line to ground fault.This protective device solved existing single-phase short circuit protective device (fuse, the band short-circuit function circuit breaker) when short circuit current less than its at the appointed time operating current and the problem of tripping.
---the testing agency of this protective device; though as the equipment protection line PE among Fig. 2 after testing components and parts be connected to N (or N '); the PE (the TN-C system is connected to PEN) that the equipment protection line PE that protects with aftercurrent action protecting equipment as shown in Figure 1 is connected to power supply finally is that the loop is formed in the telegram in reply source, but the electric current in ground short circuit loop has greatly been limited in the detection loop of this protective device.Reduce to tens milliamperes by original hundreds of peace, avoided the impact of short circuit current electrical network, equipment; Eliminate the fire that the ground arc short circuit causes; Make electronics amplify components and parts and exempt from harm, thereby prolong the functional lifetime of aftercurrent action protecting equipment, provide guarantee for aftercurrent action protecting equipment moves reliably and with long-term.
---because short circuit current reaches the protection that tens MAHs can be realized short trouble, so this scheme can preferentially overcome when having dangerous voltage because of device housings the indirect electrical shock hazard to the person.
---this device has the long and high reliability features of life-span of defencive function.
Description of drawings
Fig. 1 a: for adopting fuse RD is the elementary diagram of earthing short circuit protection device;
Fig. 1 b: for having the short-circuit protection elementary diagram of short-circuit protection function;
Fig. 1 c: the short-circuit protection elementary diagram that is provided with the final stage aftercurrent action protecting equipment in the control switch for electrical appliance on circuit;
Fig. 2 a: for being applicable to the current-limiting arc-extinguishing shunted exciter tripping type earthing short circuit protection device circuit theory diagrams of single phase circuit;
Fig. 2 b: for being applicable to the current-limiting arc-extinguishing shunted exciter tripping type earthing short circuit protection device circuit theory diagrams of three-phase circuit;
Fig. 3 a: be the schematic diagram of the testing circuit of the formation single phase circuit current-limiting arc-extinguishing shunted exciter tripping type earthing short circuit protection device among above-mentioned Fig. 2 a;
Fig. 3 b: be the schematic diagram of the testing circuit of the formation three-phase circuit current-limiting arc-extinguishing shunted exciter tripping type earthing short circuit protection device among above-mentioned Fig. 2 b;
Fig. 4 a: have the current-limiting arc-extinguishing shunted exciter tripping type earthing short circuit protection device circuit theory diagrams that residual current closes the single phase circuit of protection mechanism for being applicable to;
Fig. 4 b: have the current-limiting arc-extinguishing shunted exciter tripping type earthing short circuit protection device circuit theory diagrams that residual current closes the three-phase circuit of protection mechanism for being applicable to;
Fig. 5 a: for detecting the schematic diagram in loop in Fig. 4 a current-limiting arc-extinguishing shunted exciter tripping type earthing short circuit protection device;
Fig. 5 b: for detecting the schematic diagram in loop in Fig. 4 b current-limiting arc-extinguishing shunted exciter tripping type earthing short circuit protection device;
Fig. 6 a: another kind is applicable to the current-limiting arc-extinguishing shunted exciter tripping type earthing short circuit protection device circuit theory diagrams of the single phase circuit with residual current transfer protection mechanism;
Fig. 6 b: another kind is applicable to the current-limiting arc-extinguishing shunted exciter tripping type earthing short circuit protection device circuit theory diagrams of the three-phase circuit with residual current transfer protection mechanism;
Fig. 7 a: for detecting the schematic diagram in loop in Fig. 6 a current-limiting arc-extinguishing shunted exciter tripping type earthing short circuit protection device;
Fig. 7 b: for detecting the schematic diagram in loop in Fig. 6 b current-limiting arc-extinguishing shunted exciter tripping type earthing short circuit protection device;
Embodiment
Be described in further detail below in conjunction with the structure and the circuit theory of accompanying drawing current-limiting arc-extinguishing shunted exciter tripping type earthing short circuit protection device provided by the present invention.
Scheme one
As Fig. 2 a is the circuit theory diagrams that are used in the current-limiting arc-extinguishing shunted exciter tripping type earthing short circuit protection device of single phase circuit provided by the present invention.This earthing short circuit protection device comprises: by being used to control short switch QF and being connected with the short switch action actuating mechanism that the mechanical lock buckle 2 of spring 3 constitutes; Wherein the wiring point 4 of the power supply neutral line N under an end and the short switch QF is connected, the other end is connected to form the shunt opening trip coil TQ that starts the loop by the normally opened contact JDK and the phase line L3 of electromagnetic relay, this shunt opening trip coil TQ is used to control above-mentioned mechanical lock buckle 2, and constitutes the actuating mechanism of the short switch QF action that is connected on the phase line; The protective wire PE of the power consumption equipment M that is controlled at short switch QF and 4 of the wiring points of power supply neutral line N are serially connected with current-limiting resistance R and electromagnetic relay JD and form to detect and trigger the loop, and constitute the detection trigger mechanism that ground short circuit takes place power consumption equipment M.
As Fig. 2 b is the circuit theory diagrams that are used in the current-limiting arc-extinguishing shunted exciter tripping type earthing short circuit protection device of three-phase circuit provided by the present invention.This earthing short circuit protection device comprises equally: by being used to control short switch QF and being connected with the short switch action actuating mechanism that the mechanical lock buckle 2 of spring 3 constitutes; The shunt opening trip coil TQ that wherein wiring point 4 that is connected the power supply neutral line N ' that tie point that capacitor C 1, C2, C3 (or inductance L 1, L2, L3 of the identical parameters) back in parallel of three identical parameters forms constitutes respectively by three phase lines under an end and the short switch QF connects, normally opened contact JDK and the phase line L1 of the other end by electromagnetic relay is connected to form the startup loop, this shunt opening trip coil TQ is used to control above-mentioned mechanical lock buckle 2, and constitutes the actuating mechanism of the short switch QF action that is connected on the phase line; The protective wire PE of the power consumption equipment M that is controlled at short switch QF and 4 of the wiring points of above-mentioned power supply neutral line N are serially connected with current-limiting resistance R and electromagnetic relay JD and form to detect and trigger the loop, and constitute the detection trigger mechanism that ground short circuit takes place power consumption equipment M.
The circuit working principle of above-mentioned Fig. 2 a and Fig. 2 b current-limiting arc-extinguishing shunted exciter tripping type earthing short circuit protection device is:
Power consumption equipment M insulate when good, i.e. the insulation of power consumption equipment does not damage, and ground short circuit does not take place, and when shell was not charged, the voltage at the detection trigger mechanism two ends that are made of electromagnetic relay JD was very low.Detecting this moment and touching current in loop is zero, and electromagnetic relay JD can not trigger its normally opened contact JDK closure, therefore can not make the startup circuit communication, and actuator just can not move yet short switch is disconnected.
Wherein detect triggering element electromagnetic relay JD and only be equivalent to an impedance, do not influence the normal operation of electrical network.By " low-voltage power technical regulation " regulation, the voltage permissible variation is+7% and-10%, requires three-phase load unbalance factor≤25% simultaneously, and promptly public neutral current should be not more than 1/4 of phase line current.So wiring point 4 neutral line N are to equipment protection line PE (over the ground) voltage U
0About=220V * 10% ÷, 2 * 1/4=3V.Voltage about this 3V is enough to make electromagnetic relay JD to trigger its normally opened contact JDK closure far from, therefore can not make the startup circuit communication, and actuator just can not move yet disconnect is disconnected.
When the insulation damages of power consumption equipment M and when the ground short circuit fault takes place, the shell of power consumption equipment M promptly has the phase current potential, the voltage that detects the two ends, loop is upgraded to phase voltage (220V), at this moment, detect and trigger loop relay J D action and make its normally opened contact JDK closure, start circuit communication, the electromagnetic force that tripping coil TQ produces is opened mechanical lock buckle 2, the work of short switch actuator disconnects the purpose that short switch reaches electric power disconnection.
Detecting trigger mechanism should be prerequisite with the harm of protecting the person to exempt from dangerous voltage (50V), and certain safety factor is arranged.If the origination action voltage of testing agency is 40V, its reliable in action COEFFICIENT K then
JK=50/40=1.25.Resistance R in the loop is used for adjusting detection loop action sensitivity and guarantees to have the certain reliability requirement.When this resistance was big more, current in loop was just more little, and the terminal voltage of electromagnetic relay is just more little, and sensitivity reduces; Otherwise sensitivity raises.
When interruption of service or other and this short switch taking place not when the power consumption equipment generation phase line of isopen and neutral line short circuit on the circuit, the current potential of the neutral line can increase, relay in this detection loop, electric sun will pass to the current potential of other phase lines the shell of this power consumption equipment M, at this moment will produce harm to the insulation of this power consumption equipment, and the danger that can produce electric shock to the staff who uses this power consumption equipment.And be failure to actuate because of not forming circuit closing relay this moment.For addressing the above problem; shown in Fig. 3 a and 3b; trigger series connection one diode D in the loop in the detection that is used in current-limiting arc-extinguishing shunted exciter tripping type earthing short circuit protection device in single-phase and the three-phase circuit shown in pie graph 3a and the 3b, oppositely to end the dangerous current potential that imports power consumption equipment M shell into.
Scheme two:
Shown in Fig. 4 a, another kind provided by the invention is applicable to have the current-limiting arc-extinguishing shunted exciter tripping type earthing short circuit protection device circuit theory diagrams that residual current closes protection mechanism in the single phase circuit.This device comprises: by control ground short circuit switch QF and be connected with the short switch actuator that the mechanical lock buckle 2 of spring 3 constitutes; The residual current that is made of current transformer TA, electronic circuit amplifier V that is connected between phase line L3 and neutral line N closes protection mechanism; And two ends are connected with phase line L3 with the wiring point 4 of neutral line N respectively and are in series with residual current enlarger control switch, are used to control the shunt opening trip coil TQ of mechanical lock buckle 2; The protective wire PE of the power consumption equipment M that controls at short switch and 4 of the wiring points of above-mentioned power supply neutral line N are serially connected with current-limiting resistance R, and diode D forms inspection and spatters and trigger the loop, and constitutes the detection trigger mechanism that ground short circuit takes place power consumption equipment M.
Shown in Fig. 4 b, another kind provided by the invention is applicable to have the current-limiting arc-extinguishing shunted exciter tripping type earthing short circuit protection device circuit theory diagrams that residual current closes protection mechanism in the three-phase circuit.This device comprises: by control ground short circuit switch QF and be connected with the short switch actuator that the mechanical lock buckle 2 of spring 3 constitutes; The residual current that is made of current transformer TA, electronic circuit amplifier V that is placed on three phase line L1, L2, the L3 closes protection mechanism; And the wiring point 4 of the power supply neutral line N ' that constitutes of the tie point that forms of end and a capacitor C 1 that is connected three identical parameters by three phase lines respectively, C2, C3 (or inductance L 1, L2, L3 of identical parameters) back in parallel connects, and the other end closes the normally opened contact VK of protection mechanism and the shunt opening trip coil TQ that phase line L1 is connected to form the startup loop by residual current.This shunt opening trip coil TQ is used to control above-mentioned mechanical lock buckle 2, and constitutes the actuating mechanism of short switch QF action; The protective wire PE of the power consumption equipment M that controls at short switch and 4 of the wiring points of above-mentioned power supply neutral line N ' are serially connected with current-limiting resistance R, and diode D forms to detect and triggers the loop, and constitutes the detection trigger mechanism that ground short circuit takes place power consumption equipment M.
Above-mentioned Fig. 4 a and Fig. 4 b have the circuit working principle that residual current closes the current-limiting arc-extinguishing shunted exciter tripping type earthing short circuit protection device of protection mechanism to be:
Send out fully M when electricity consumption and insulate when good, i.e. the insulation of power consumption equipment does not damage, does not take place ground short circuit, shell when not charged, and its residual current is zero, i.e. I
0=0, be connected in the detection loop current I between neutral line N and the equipment protection line PE
jBe zero.This moment, residual current closed the normally opened contact VK conducting that protection mechanism can not make its control, therefore can not make the startup circuit communication, and actuator just can not move yet short switch is disconnected.
When the insulation damages of power consumption equipment M the ground short circuit fault taking place, promptly there is voltage at the two ends, detection loop that are connected between neutral line N or N ' and the equipment protection line PE, when voltage is 40V, detect the electric current I in loop
jBe made as the desired action current I of residual current acting device
Δ N, i.e. I
j=I
Δ N, at this moment, by detecting the loop with earth short circuit current I
d (1)Limit to desired action current I
Δ NResidual current I
0=I
j=I
Δ N, the VK contact conducting of electronics amplifying return circuit is communicated with the tripping coil loop, makes actuator's action and cuts off the electricity supply.
Above-mentioned have residual current as Fig. 4 a and Fig. 4 b and close the advantage that the current-limiting arc-extinguishing shunted exciter tripping type earthing short circuit protection device of protection mechanism has:
One, can be with equipment ground short circuit I
d (1)Limit desired action current I to aftercurrent action protecting equipment
Δ N, eliminate the impact of short circuit current to power transformer, equipment, circuit and residual current amplifier element;
Two, the arc power that short circuit current can be produced be subdued to the power that ignites;
Three, simple in structure, dependable performance can prolong the life-span of aftercurrent action protecting equipment function greatly.
Be depicted as Fig. 6 a and 6b and another kind ofly be applicable to the having current-limiting arc-extinguishing shunted exciter tripping type earthing short circuit protection device circuit theory diagrams that residual current divides the single-phase and three-phase circuit of ejector half protection mechanism respectively.The circuit structure of this device is basic identical with the structure of Fig. 4 a and Fig. 4 b respectively, and different is the connected mode difference that constitutes the detection loop of above-mentioned current-limiting arc-extinguishing shunted exciter tripping type earthing short circuit protection device.When the insulation damages of power consumption equipment M and when the ground short circuit fault takes place; to detect the loop and can play the actuating mechanism that connection is made of shunt opening trip coil in order to make, therefore will detect between the protective wire PE that the loop is connected in the load side N of residual current transformer TA or N ' and power consumption equipment M.The contact VK of relay normally open contact JDK and residual current amplifier V is parallel to the startup loop that is formed by tripping coil.
Its operation principle is:
When the insulation damages generation ground short circuit fault of power consumption equipment M, the leakage current of phase line through device housings protective wire PE, detect loop to the load side of residual current transformer TA and flow back to power supply, at this moment, concerning instrument transformer TA, residual current I
0=0, so it can not move, not conducting of amplifier VK starts the loop.Start working and detect the loop, when detecting the loop both end voltage and reach about definite value, its normally opened contact of relay J D action triggers JDK is closed and startup loop that be communicated with tripping coil TQ disconnects switch, thereby reaches the purpose of ground short circuit realization shunted exciter tripping.
The advantage that the current-limiting arc-extinguishing shunted exciter tripping type earthing short circuit protection device of the single-phase and three-phase circuit with residual current transfer protection mechanism of said structure has is:
One, can be with equipment ground short circuit current I
d (1)Limit desired action current I to aftercurrent action protecting equipment
Δ NBelow, make residual current I
0=O protects electronics to amplify the harm impact that components and parts exempt from short circuit current to greatest extent, prolongs the life-span of aftercurrent action protecting equipment function.
Two, eliminate the impact harm of short circuit current to power transformer, circuit, power consumption equipment.
Three, can realize the dropout respectively of equipment ground short circuit and line insulation fault.
Four, the arc power that earth short circuit current can be produced be subdued to the power that ignites, the fire of stopping to cause thus.
Five, simple in structure, dependable performance, the life-span is long.
Six, can cancel low pressure TN grounding system is the TT system, with save from power supply draw to the protective wire between power consumption equipment.Because of the TN system provides one can make the big as far as possible close access of short circuit current or residual current during for the equipment ground short circuit, so that short-circuit protection or aftercurrent action protecting equipment action.
Seven, can cancel the protective earthing device of power consumption equipment.Because of the protective earthing of equipment mainly is to be residual current I
0Generation a path is provided so that aftercurrent action protecting equipment action.
Eight, can be used for the power consumption equipment ground protection control of IT system.Intrasystem capital equipment be can be used for signal alarm; Minor equipment be can be used for tripping operation.
In the detection loop shown in Fig. 5 a, 5b, 7a and the 7b, be connected purpose by unidirectional conducting diode D, be for fear of when interruption of service or other and this short switch taking place not when the power consumption equipment generation phase line of isopen and neutral line short circuit on the circuit equally, the current potential of the neutral line raises and current potential is passed to the shell of this power consumption equipment M, the danger that can produce harm and the staff who uses this power consumption equipment be produced electric shock the insulation of this power consumption equipment.
Claims (10)
1. current-limiting arc-extinguishing shunted exciter tripping type earthing short circuit protection device comprises:
The short switch actuator that constitutes by mechanical lock buckle of control ground short circuit switch;
Control the shunt opening trip coil of described mechanical lock buckle;
It is characterized in that:
Be serially connected with current-limiting resistance and electromagnetic relay between the protective wire PE of the power consumption equipment shell that described short switch is controlled and the power supply neutral point that described shunt opening trip coil is connected, form to detect and trigger the loop, constitute the detection trigger mechanism of described power consumption equipment generation ground short circuit;
One end of described shunt opening trip coil is connected with the power supply neutral point, and the other end is connected with phase line by the normally opened contact of described relay, forms to start the loop, and constitutes the actuating mechanism of described short switch action.
2. a kind of current-limiting arc-extinguishing shunted exciter tripping type earthing short circuit protection device as claimed in claim 1 is characterized in that: described detection triggers the diode that is in series with unidirectional conducting in the loop.
3. a kind of current-limiting arc-extinguishing shunted exciter tripping type earthing short circuit protection device as claimed in claim 1 is characterized in that: described power supply neutral point is the electric connection point on the power supply neutral line.
4. current-limiting arc-extinguishing shunted exciter tripping type earthing short circuit protection device comprises:
The short switch actuator that constitutes by mechanical lock buckle of control ground short circuit switch;
Be connected in the residual current enlarger between circuit, and the shunt opening trip coil that is used to control described mechanical lock buckle, the one end is connected with the power supply neutral point, and the residual current enlarger control switch of the other end through being connected in series is connected with phase line;
It is characterized in that:
Between the protective wire PE of the power consumption equipment shell that described short switch is controlled and power supply neutral point that described shunt opening trip coil is connected, be serially connected with current-limiting resistance, form to detect and trigger the loop, thereby constitute the detection trigger mechanism of described power consumption equipment generation ground short circuit;
One end of described shunt opening trip coil is connected with the power supply neutral point, and the described residual current enlarger control switch of the other end through being connected in series is connected with phase line, forms to start the loop, and constitutes the actuating mechanism of described short switch action.
5. a kind of current-limiting arc-extinguishing shunted exciter tripping type earthing short circuit protection device as claimed in claim 4 is characterized in that: described detection triggers the diode that is in series with unidirectional conducting in the loop.
6. a kind of current-limiting arc-extinguishing shunted exciter tripping type earthing short circuit protection device as claimed in claim 4 is characterized in that: described power supply neutral point is the electric connection point on the power supply neutral line.
7. a kind of current-limiting arc-extinguishing shunted exciter tripping type earthing short circuit protection device as claimed in claim 4; it is characterized in that: described power supply neutral point is: each phase line is connected in a bit after connecting an electric capacity separately in three phase lines; be connected in a bit after perhaps each phase line in three phase lines connects an inductance separately; this point constitutes described power supply neutral point, and wherein each described electric capacity or inductance have identical parameter.
8. a kind of current-limiting arc-extinguishing shunted exciter tripping type earthing short circuit protection device as claimed in claim 4 is characterized in that: described residual current enlarger is connected between two end points that constitute described detection triggering loop.
9. a kind of current-limiting arc-extinguishing shunted exciter tripping type earthing short circuit protection device as claimed in claim 4 is characterized in that: described residual current enlarger is connected in described detection and triggers between loop and the described startup loop.
10. a kind of current-limiting arc-extinguishing shunted exciter tripping type earthing short circuit protection device as claimed in claim 9; it is characterized in that: described detection triggers in the loop and is serially connected with relay, and wherein the normally opened contact of this relay and described residual current enlarger control switch are connected in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100792823A CN101350514B (en) | 2008-08-25 | 2008-08-25 | Current-limiting arc-extinguishing shunted exciter tripping type earthing short circuit protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100792823A CN101350514B (en) | 2008-08-25 | 2008-08-25 | Current-limiting arc-extinguishing shunted exciter tripping type earthing short circuit protection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101350514A CN101350514A (en) | 2009-01-21 |
| CN101350514B true CN101350514B (en) | 2010-04-21 |
Family
ID=40269165
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008100792823A Expired - Fee Related CN101350514B (en) | 2008-08-25 | 2008-08-25 | Current-limiting arc-extinguishing shunted exciter tripping type earthing short circuit protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101350514B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103401228B (en) * | 2013-07-30 | 2016-03-23 | 国家电网公司 | A kind of suppressing method of unsymmetrical short-circuit electric current |
| DE102017214205A1 (en) | 2017-08-15 | 2019-02-21 | Robert Bosch Gmbh | Control unit with circuit and method for short-circuit protection of ground lines and sensors |
| CN108695820A (en) * | 2018-07-21 | 2018-10-23 | 朱德锋 | Anti-reverse electrical ground protection system |
| EP3985708A1 (en) * | 2020-10-16 | 2022-04-20 | ABB Schweiz AG | Current breaker device |
| CN113589061B (en) * | 2021-06-09 | 2024-02-23 | 广东电网有限责任公司广州供电局 | Relay protection outlet testing device |
| CN114019324A (en) * | 2021-11-02 | 2022-02-08 | 常熟理工学院 | Low-voltage intelligent circuit breaker load side distribution line insulation online detection sensing device and method |
| CN114034991A (en) * | 2021-11-02 | 2022-02-11 | 常熟理工学院 | Low-voltage circuit breaker load side distribution line insulation on-line detection and protection device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86209849U (en) * | 1986-12-08 | 1987-12-05 | 胡国清 | Electricity leakage protection switch |
| DE3642136A1 (en) * | 1986-12-10 | 1988-06-23 | Licentia Gmbh | Electronic tripping device for switches (circuit breakers) which limit the short-circuit current |
| CN1104809A (en) * | 1994-10-12 | 1995-07-05 | 褚衍芝 | Relay protector |
| CN2485782Y (en) * | 2001-05-16 | 2002-04-10 | 正泰集团公司 | Separate excited releaser |
| CN101232169A (en) * | 2008-01-29 | 2008-07-30 | 常立柱 | Shunted exciter tripping type single-phase short circuit protecting equipment |
-
2008
- 2008-08-25 CN CN2008100792823A patent/CN101350514B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86209849U (en) * | 1986-12-08 | 1987-12-05 | 胡国清 | Electricity leakage protection switch |
| DE3642136A1 (en) * | 1986-12-10 | 1988-06-23 | Licentia Gmbh | Electronic tripping device for switches (circuit breakers) which limit the short-circuit current |
| CN1104809A (en) * | 1994-10-12 | 1995-07-05 | 褚衍芝 | Relay protector |
| CN2485782Y (en) * | 2001-05-16 | 2002-04-10 | 正泰集团公司 | Separate excited releaser |
| CN101232169A (en) * | 2008-01-29 | 2008-07-30 | 常立柱 | Shunted exciter tripping type single-phase short circuit protecting equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101350514A (en) | 2009-01-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101350514B (en) | Current-limiting arc-extinguishing shunted exciter tripping type earthing short circuit protection device | |
| CN102222893B (en) | A kind of fast failure demand limiter based on current-carrying isolator | |
| US9219360B2 (en) | Safe quick disconnect leakage protector | |
| CN105098748B (en) | A kind of Surge Protector and the method for lifting its temporary overvoltage tolerance | |
| CN105594084A (en) | Fast switch fault current limiter | |
| CN103399229B (en) | Device for protection outlet of relay protection proving installation | |
| CN100546142C (en) | A kind of shunted exciter tripping type single-phase short circuit protecting equipment | |
| CN103683225A (en) | Ground fault protection method of nuclear plant low-voltage power distribution system in all power supply ranges | |
| CN201210614Y (en) | Residual current controlling and monitoring protector | |
| CN109245077A (en) | Integrated back-up protection lightning protection for power supply | |
| US20170331275A1 (en) | Reverse fault current interruptor and electrical power system employing the same | |
| Zhen et al. | Simple analysis of the measurement methods of arc fault | |
| CN201278455Y (en) | Large capacity high voltage current limiting protection apparatus | |
| RU2619777C2 (en) | Device for protection of electrical consumers from overvoltage in single-phase ac networks | |
| CN101227074A (en) | Method for making earth leakage protection without action dead region and breaker thereof | |
| TWI687012B (en) | Circuit breaker tripping loop system improvement device | |
| CN203193273U (en) | Intelligent turn-adjustment arc-extinguishing voltage-limiting device | |
| CN112071725A (en) | Double-channel circuit breaker and overcurrent protection system | |
| CN206293872U (en) | A kind of SPD back-up protection devices based on electromagnetic differential | |
| Kaiser et al. | A Comprehensive Approach for Safety in DC-Microgrids | |
| CN105576632A (en) | Novel surge protection device | |
| CN212365903U (en) | Double-channel circuit breaker and overcurrent protection system | |
| CN1141765C (en) | Earthing protective method and device for low voltage distribution system | |
| CN211456666U (en) | Novel explosion-proof isolation protection of power consumption device | |
| CN2409693Y (en) | Low-voltage distributing system grounding protector |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20170327 Address after: 102208 Beijing city Changping District District Dragon Jinyuan four 20-6-302 Patentee after: Zhang Hong Address before: 053500 Jingxian County Province Electric Power Bureau family member courtyard building, unit 6, unit 301, two Patentee before: Chang Lizhu |
|
| DD01 | Delivery of document by public notice | ||
| DD01 | Delivery of document by public notice |
Addressee: Zhang Hong Document name: Notification of Passing Examination on Formalities |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100421 Termination date: 20180825 |