CN86206253U - Fast selector of breaker for distributing station - Google Patents

Abstract

The utility model relates to a selector for quick break protection of electricity and selective instantaneous trip, which is suitable for distributing stations of various corporations. The utility model can instantaneously judge the fault point when a certain electrical element generates short circuit fault in the distributing station of the corporation, and selectively facilitate the inlet wire of the electrical source instantly to carry out tripping operation. The selector provides input signals by using the electrical source inlet wire of the distributing station and the current quick break protective relay connection point of each feeder line, and then judges the fault point of the signal. Thereby, the tripping coil of the breaker of the electrical source inlet wire is controlled. If the fault belongs to an internal fault, the tripping coil is switched on, and the breaker instantly carries out tripping operation; if the fault belongs to an external fault, the tripping circuit is locked in order to achieve the purpose of selectively making instantaneous actions to the electrical source inlet wire protection.

Description

Fast selector of breaker for distributing station

The utility model relates to a kind of in industrial and mining enterprises' changes (joining) electricity institute, the selector of the selective instantaneous tripping operation of electric power incoming line current quick.

At present, enterprise's change (joining) electricity electric power incoming line that solves selectively trips and takes two kinds of ways.The first: electric power incoming line adopts the delaying current fast tripping protection, and each feeder line adopts the transient current fast tripping protection.Like this, the circuit breaker of open failure circuit selectively, but because this boundary belt deferred action makes the current quick of upper level circuit need be with longer deferred action.Be unfavorable for the stable of electric power system like this.Another kind of way is: adopt special-purpose bus differential protecting device (for example homemade BCD-9A bus differential relay and patent EP-98721A), this protection can instantaneous selectively open failure, but costs an arm and a leg, and install, debugging is all complicated.

The purpose of this utility model is for having direct current operative power source (alternating current operation in this way then should be installed the tandem type auxiliary relay), enterprise's change (joining) electricity a kind of current quick selector that provides of current quick all being housed into and out of line.It can be in becoming (joining) electricity institute when certain electric component be short-circuited fault, and instantaneous differentiation fault point ， And makes the electric power incoming line tripping operation selectively.

Operation principle of the present utility model is: utilize the current relay normal opened contact that becomes (joining) electric institute electric power incoming line and each feeder current fast tripping protection that the input sample signal of this selector is provided; when the current relay of current quick moves; its normal opened contact closure illustrates that this circuit has fault current to pass through.Because the normal opened contact closure can be introduced a direct current voltage sampling signal.Input signal divides two groups, one group is the electric power incoming line signal, another group is the feeder line group signal that multiterminal input disjunction gate is formed, and these two groups inputs are all sent into " XOR gate " and carried out the fault point differentiation: when the electric power incoming line signal was only arranged, explanation was a busbar fault, at this moment, " XOR gate " has output, and its output is sent into a delay circuit after electric current amplifies, and makes the controllable silicon conducting through certain time of delay, connect the electric power incoming line connect with the controllable silicon breaking coil that opens circuit, circuit breaker is disconnected immediately; If existing electric power incoming line signal input has the feeder signals input again, then explanation is a feeder fault, at this moment, " XOR gate " no-output, controllable silicon can not conducting.So the electric power incoming line circuit breaker can not disconnect, but fault feeder can be moved by the current quick of itself and disconnect immediately accordingly, thereby short trouble is got rid of.Below just reached rapid differentiation fault, again the purpose of deenergization inlet wire selectively.

The utility model will be further described below in conjunction with accompanying drawing.

Accompanying drawing is the key wiring diagram that becomes (joining) electric institute current quick selector.

The utility model is made up of following components: advanced by existing; feeder current fast tripping protection relay tip (1); voltage-stabiliser tube (2) and divider resistance (3); (4) bleeder circuit of Zu Chenging; by diode; the disjunction gate circuit (5) that resistance or integrated circuit are formed; the monostable time delay circuit of forming by integrated circuit (6); (7) and by the two ends that integrated circuit is formed import " with door " (8); " XOR gate " (9) of forming by integrated circuit; the emitter follower of being made up of triode (10) is by potentiometer; resistance; the delayer (11) that capacitor and unijunction transistor are formed and executive component is unidirectional or bidirectional triode thyristor compositions such as (12).

A is the electric power incoming line signal input part in the accompanying drawing, when the normal opened contact of A front is closed, will introduce+220 volts of direct voltages.B to K is each feeder line group signal input part, when the arbitrary normal opened contact of B to K front is closed, represents that this feedback line has short circuit current to flow through, and will introduce+220 volts of direct voltages.By A introduce+220 volts of voltage through resistance (4) and voltage stabilizing value be 5 volts voltage-stabiliser tube (2) obtain+5 volts of voltages deliver to delay circuit (6).When the arbitrary end among the B to K is introduced+220 volts of voltages, also obtain one+5 volts voltage by divider resistance (3) dividing potential drop and deliver to the respective input of disjunction gate (5), deliver to delay circuit (7) through disjunction gate (5) output, deliver to " with door " (8) simultaneously after the output of delay circuit (6) and (7), its output signal again and the output signal of delay circuit (6) deliver to " XOR gate " (9) simultaneously and carry out the fault point and differentiate.If the effect of " with door " (8) is to avoid B to K feeder signals to send into " XOR gate " (9) separately and cause misoperation.By the logical formula Z=X y+ Xy of " different close door " wherein Z represent output signal, x, y represents input signal.X, Y represent x respectively, the non-amount of y.(mark is seen accompanying drawing), have only when x for " 1 ", y is " 0 "; Or x is " 0 ", and when y was " 1 ", z just was " 1 ", and output is promptly arranged.But owing to added " with door " (8) before the y input, make that x is " 0 ", y is impossible for the state of " 1 " becomes.Thereby only when x be " 1 "; when y is " 0 "; just there is " 1 " output " XOR gate " (9); that is to say only when electric power incoming line current quick relay tip closure; under all inc situation of the current quick-breaking relay tip of all the other each feeder lines; be that bus is when having short trouble; just there is " 1 " output " XOR gate " (9); output signal is after emitter follower (10) electric current amplifies; again through one-level by resistance; after delayer (11) time-delay that electric capacity and unijunction transistor are formed; (time of delay is adjustable in 50 milliseconds to 200 milliseconds) sends trigger impulse; make controllable silicon (12) conducting; thereby connected the electric power incoming line circuit breaker trip coil that is serially connected with in the controllable silicon loop, it is tripped immediately.Add the time error on the closing of contact in the time of to eliminate inlet wire current fast tripping protection relay and each feeder current fast tripping protection relay a time of delay effectively and move simultaneously.The supply voltage of selector is+5 volts, is introduced by direct current operative power source; 0 volt of power supply should link with 0 of operating power.

This selector structure is simple, and it is convenient to install, debug, and when adopting the above embodiments structure, it is with low cost, and total cost is about 1/10th of existing product.

When installing and using this selector, only need to draw on the normal opened contact with electric power incoming line and each feeder current fast tripping protection relay (being generally the DL-11 type) signal line to the respective input of this selector (A, B ... K). Again silicon controlled output P is caused electric power incoming line circuit breaker trip winding wiring (label is 33 on the national standard design drawing), namely finished installation procedure.

Claims (3)

1; the current relay normal opened contact of a kind of utilization change (joining) electric institute electric power incoming line and each feeder current fast tripping protection provides the current quick selector of input signal; it is characterized in that two signal input circuits forming by the disjunction gate [5] of electric power incoming line signal input part A and multiterminal (B to K) input; its signal is respectively through a delay circuit [6]; [7] and " with door " [8] of the input of two ends; after sending into " XOR gate " [9] differentiation; deliver to delayer [11] after amplifying by emitter follower [10] electric current again; send trigger impulse at last, control controllable silicon [12].

2,, it is characterized in that delayer (11) is made up of potentiometer, resistance, capacitor and unijunction transistor by the selector of claim 1 regulation.

3, by the selector of claim 1 regulation, it is characterized in that executive component (12) is unidirectional or bidirectional triode thyristor.

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