CN201413981Y

CN201413981Y - Protective device of power supply equipment in communication base station

Info

Publication number: CN201413981Y
Application number: CN200920102862XU
Authority: CN
Inventors: 吴明
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-05-20
Filing date: 2009-05-20
Publication date: 2010-02-24
Anticipated expiration: 2019-05-20

Abstract

The utility model relates to a protective device of power supply equipment in a communication base station. The protective device comprises a sampling circuit, a voltage transfinite detection circuit,an under-voltage detection circuit, a phase failure detection circuit, a neutral line detection circuit, an execution control circuit and a timing control circuit. The protective device has the advantages that when an abnormal situation occurs to a dynamic power supply in the communication base station, the power supply of the base station equipment can be automatically switched off, and simultaneously be automatically converted into a battery power supply; when the influences on the base station power supply such like lightning stroke and abnormal voltage fluctuation are eliminated, automatic starting can be carried out, thereby effectively performing the protective function of safe operation of the power supply in the communication base station.

Description

Communication base station and electric power equipment protection device

Technical field

The utility model relates to a kind of communication base station and electric power equipment protection device.

Figure viewed from behind technology

That communication base station is meant is mobile, fixed line and data two big class communication base stations.Build the open field that subjects to be struck by lightning away from the high mountain in cities and towns, wilderness etc. because the communication base station is most of, these regional base station equipments especially power-supply device thunderstorm season often because the thunderbolt influence, and cause a large amount of damages, had a strong impact on the normal operation of base station equipment.Simultaneously because what be that these area communication base stations power almost all is the relatively poor rural power grids of power supply quality, thereby the lasting damage of the base station equipments that reason caused such as the fluctuation of regular electric voltage exception and the phase failure, formed another key factor that has a strong impact on the normal operation of base station equipment again.

The utility model content

Technical problem to be solved in the utility model provides a kind of can the realization power supply power line of communication base station is detected and the automatic control power supply equipment communication base station and electric power equipment protection device of automatic switching within a certain period of time automatically, in order to overcome the deficiencies in the prior art.

The technical scheme that its technical problem that solves the utility model adopts is: communication base station and electric power equipment protection device, this device comprises sample circuit, the voltage testing circuit that transfinites, under-voltage and open-phase detection circuit, neutral line testing circuit, carry out control circuit and timing control circuit, wherein, the input termination power power-line of sample circuit, its output connects the voltage testing circuit that transfinites respectively, the input of automatic testing circuit of the under-voltage and phase failure and neutral line testing circuit, the voltage testing circuit that transfinites, the output of automatic testing circuit of the under-voltage and phase failure and neutral line testing circuit is connected with the input of carrying out control circuit respectively, carry out control circuit and divide two-way output, one tunnel output connects the input of timing control circuit, the input of letter base station power equipment is connected in another road output, and the output termination of timing control circuit is carried out the input of control circuit.

Described sample circuit is made of four groups of structure sample circuits identical and parallel with one another, the input of three groups of sample circuits connects power power-line respectively, its output connects the transfinite input of testing circuit and under-voltage and open-phase detection circuit of voltage respectively, the input of another group sample circuit connects to neutral, the connect to neutral input of testing circuit of its output, sample circuit wherein one group form by AC transformer B1, rectifier bridge DX1, the first utmost point of AC transformer B1 connects power power-line, and the inferior utmost point of AC transformer B1 connects the input of rectifier bridge DX1.

The described voltage testing circuit that transfinites is made of three groups of structure voltages identical and parallel with one another testing circuit that transfinites, wherein form by diode D2, capacitor C 1-C2, resistance R 1-R2, one-way SCR DR1 for one group, resistance R 1-R2 constitutes bleeder circuit, the output of the corresponding one group of sample circuit of input termination of this bleeder circuit, the π formula filter circuit order that the output of bleeder circuit is formed via capacitor C 1, diode D2, capacitor C 2 is to the control utmost point of controllable silicon DR1, and the anode of one-way SCR DR1 connects the input of carrying out control circuit.

Described under-voltage and open-phase detection circuit are made of three groups of structure under-voltage and open-phase detection circuits identical and parallel with one another, wherein one group by resistance R 15-R17, capacitor C 15-C17, diode D16-18, triode Q5-Q6, relay J C forms, resistance R 15-R16 constitutes bleeder circuit, the input of bleeder circuit is connected with the output of corresponding one group of sample circuit, capacitor C 15-C16 is connected to input and the output of diode D16 respectively, capacitor C 15-C16 and diode D16 constitute π formula filter circuit jointly, the output of bleeder circuit connects the base stage of triode Q5 through π formula filter circuit, the base stage of the collector connecting transistor Q6 of triode Q5, node between triode Q5 and triode Q6 is connected to resistance R 17, its another node is through capacitor C 17 ground connection, the collector electrode of triode Q6 is succeeded the input of electrical equipment JC through diode D17, be connected to diode D18 between the input of relay J C and the output, the output termination of relay J C is carried out the input of control circuit.

Described neutral line testing circuit is made up of divider resistance R7-R8, capacitor C 7-C8, diode D7, one-way SCR DR4, resistance R 7-R8 constitutes bleeder circuit, the output of the corresponding one group of sample circuit of input termination of this bleeder circuit, the π formula filter circuit order that the output of bleeder circuit is formed via capacitor C 7, diode D7, capacitor C 8 is to the control utmost point of controllable silicon DR4, and the anode of one-way SCR DR4 connects the input of carrying out control circuit.

Described execution control circuit is by relay J A, JD, diode D1, contactor JK1-JK3, the contactor power save circuit is formed, the contactor power save circuit is made of three groups of structure power save circuits identical and parallel with one another, relay J A parallel with one another, the input of JD respectively with the voltage testing circuit that transfinites, under-voltage and open-phase detection circuit, the output of neutral line testing circuit connects, the Control Node JA1-JA3 of relay J A is connected through the input of contactor power save circuit with contactor JK1-JK3 respectively, and the Control Node JA4 of relay J A connects the control end of timing control circuit.

Described wherein one group of power save circuit is made of capacitor C 18 and the resistance R 34 that is connected between capacitor C 18 inputs and the output.

Described timing control circuit is made up of relay J A4, capacitor C 27, three groups of timing circuits that structure is identical and parallel with one another, resistance R 30, one-way SCR DR5, capacitor C 28-C29, diode D12, relay J B, relay J A4 one end links to each other with the output of carrying out control circuit, the input of another termination timing circuit, the output order of timing circuit is to the control utmost point of controllable silicon DR5, the anode of one-way SCR links to each other with relay J B, the Control Node JB1﹠amp of relay J B; 2 are connected to the input control end of carrying out control circuit.

Described wherein one group of timing circuit is made up of timing selecting switch S2, programmable Timer integration module IC1, resistance R 21-R23, R31, capacitor C 30-C31, diode D5.

The beneficial effects of the utility model are: owing to cause the communication base station electrical source of power unusual situation to occur; usually all be to occur in thunderstorm season and rural power grids area; the time of taking place is irregular randomness and breaks out suddenly; and the of short duration phenomenon of lasting appearance in several minutes to tens of minutes; as thunderbolt; the lasting cycle major part of electric voltage exception fluctuation situation is about 10 minutes; and the utility model can automatically shut down protected base station equipment power supply when breaking down omen; power supply with base station equipment simultaneously is automatically converted to the base station battery power supply; do not influence the operate as normal of communication base station; treat after thunderbolt and the abnormal voltage fluctuation elimination Auto Power On again, effectively played the protective action of communication base station and electric power equipment safety operation.

Description of drawings

Fig. 1 is a block diagram of the present utility model.

Fig. 2 is circuit theory diagrams of the present utility model.

Embodiment

Be that the utility model is described in further detail for example below with the accompanying drawing: as Fig. 1; shown in Figure 2; the communication base station and electric power equipment protecting equipment; this device comprises sample circuit; the voltage testing circuit that transfinites; under-voltage and open-phase detection circuit; neutral line testing circuit; carry out control circuit and timing control circuit; wherein; the input termination power power-line of sample circuit; its output connects the voltage testing circuit that transfinites respectively; the input of automatic testing circuit of the under-voltage and phase failure and neutral line testing circuit; the voltage testing circuit that transfinites; the output of automatic testing circuit of the under-voltage and phase failure and neutral line testing circuit is connected with the input of carrying out control circuit respectively; carry out control circuit and divide two-way output; one tunnel output connects the input of timing control circuit; the input of letter base station power equipment is connected in another road output, and the output termination of timing control circuit is carried out the input of control circuit.

The transfinite purpose of testing circuit of voltage is: after the sample circuit sampling, automatically detect the voltage condition of 380V electrical source of power, when taking place because thunderbolt or the fluctuation of electrical source of power electric voltage exception when surpassing the detection magnitude of voltage of setting, this will the be transfinited variable quantity of voltage of circuit detects, send the execution control circuit to, control contactor JK1, JK2, JK3 adhesive, the power supply of sever supply base station power equipment.

The transfinite operation principle of testing circuit of voltage is: when the interchange 380V ac power power supply of input is in the normal power supply scope, three-phase alternating voltage is after the sample circuit sampling, after resistance R 1, R2 dividing potential drop, π formula filter circuit through capacitor C 1, diode D2, capacitor C 2 compositions, be added in transfiniting on the one-way SCR DR1 control utmost point G and detect the conducting trigger voltage of voltage less than one-way SCR DR1, so one-way SCR DR1 does not trigger, full machine is in automatic detected state, and complete machine is failure to actuate.When occurring owing to thunderbolt or the fluctuation of electrical source of power electric voltage exception; will on power power-line, generate the non-systematicness pulsating voltage that a moment raises; this voltage is after the sample circuit sampling; by resistance R 1; after the R2 dividing potential drop; through capacitor C 1; diode D2; the π formula filter circuit that capacitor C 2 is formed; be added on the one-way SCR DR1 control utmost point G; when this voltage surpasses the conducting triggering level of one-way SCR DR1; one-way SCR DR1 triggering and conducting; the feasible relay J A that carries out control circuit; the JD adhesive; make the JA1 that is subjected to relay J A again; JA2; 3 A.C. contactor JK1 of JA3 three node control; JK2; the JK3 adhesive; cut-out is to the power supply of the interchange 380V of communication base station and electric power equipment, and full machine enters automatic guard mode.Because the characteristic of one-way SCR DR1, in case after the one-way SCR DR1 conducting, even if original condition of one-way SCR DR1 control utmost point triggering and conducting that causes disappears, one-way SCR DR1 still can not turn-off, and circuitry still can make A.C. contactor JK1, JK2, JK3 keep attracting state.Can design when the alternating voltage that detects input surpass rated voltage 30% the time, be that 380V+380VX30%=494V is the triggering and conducting level of one-way SCR DR1, the detected value of this triggering level is transferred in the survey and can be realized by regulating resistance R 1 in reality.Because the residing environment electromagnetics of communication base station disturbs bigger, for the control end that guarantees one-way SCR DR1 is not subjected to spuious electric pulse interference effect in normal operation, before the control end of one-way SCR DR1, increased a π formula filter circuit of forming by capacitor C 1, diode D2, capacitor C 2, wherein the effect of diode D2 is the stray electrical impulse disturbances component that will be about to enter in the detection signal of one-way SCR DR1 control end, releases by filter capacitor C1 and the C2 by its two ends after the rectification.

Purpose under-voltage and the automatic testing circuit of the phase failure is: after the sample circuit sampling, automatically detect the phase failure situation of the under-voltage and electrical source of power circuit of 380V electrical source of power voltage, be lower than rated voltage or the circuit phase failure occur and the neutral line when opening circuit these situations when electrical source of power voltage takes place, circuit will come out the component detection of this variation automatically, send the execution control circuit to, control A.C. contactor JK1, JK2, JK3 adhesive, the interchange 380V power supply of sever supply base station power equipment.

Operation principle under-voltage and the automatic testing circuit of the phase failure is: under normal circumstances 3 cross streams voltages are after the sample circuit sampling, be added to the base stage of triode Q5 through diode D16 by resistance R 15, R16 dividing potential drop, make triode Q5 be in saturation condition, triode Q6 is in cut-off state, not adhesive of relay J C, circuitry is in detected state.When 3 cross streams circuit arbitrary occurs mutually opening circuit or be lower than 35% when following of rated supply voltage when voltage; detection voltage on the triode Q5 base stage will be lower than below the 0.1V; triode Q5 changes the relay J A adhesive of being carried out control circuit by, triode Q6 by, relay J C adhesive saturated by becoming and control into by saturated; finally cause A.C. contactor JK1, JK2, JK3 adhesive; disconnection reaches the protection purpose to the Alternating Current Power Supply of base station power equipment.Capacitor C 16 in this circuit, diode D16, capacitor C 23 are formed π formula filter circuit, wherein the effect of diode D16 is with the stray electrical impulse disturbances component in the detection signal, through after the diode D16 rectification again filter capacitor C15 and the C16 by its two ends release.

The purpose of neutral line testing circuit is: after the sample circuit sampling, automatically detect the neutral line generation open circuit conditions of the 380V AC power of supplying with base station power equipment, can automatically the variation voltage detecting of this situation be come out, send the execution control circuit to, the AC power of control contactor JK1 adhesive sever supply base station power equipment.

The operation principle of neutral line testing circuit is: be connected the common ground line of the neutral line and base station respectively with the elementary two ends of AC transformer B4 in the corresponding sample circuit of neutral line testing circuit, under the normal condition, the current potential at these two ends all is zero volt, thereby make the control of the one-way SCR DR4 in the neutral line testing circuit extremely go up almost to detect that one-way SCR DR4 is in cut-off state less than voltage.When the neutral line opens circuit; the neutral line is to voltage occurring between the common ground line; generally speaking for about the 100---200 volt; this voltage when resistance R 7, R8 dividing potential drop are added to the control utmost point of one-way SCR DR4, can directly trigger one-way SCR DR4 conducting after the sample circuit sampling; and then make the relay J A adhesive of carrying out control circuit; finally cause A.C. contactor JK1, JK2, JK3 adhesive, cut off the Alternating Current Power Supply to base station power equipment, full machine enters automatic guard mode.

Described execution control circuit is by relay J A, JD, diode D1, contactor JK1-JK3, the contactor power save circuit is formed, the contactor power save circuit is made of three groups of structure power save circuits identical and parallel with one another, relay J A parallel with one another, the input of JD respectively with the voltage testing circuit that transfinites, under-voltage and open-phase detection circuit, the output of neutral line testing circuit connects, the Control Node JA1-JA3 of relay J A is connected through the input of contactor power save circuit with contactor JK1-JK3 respectively, and the Control Node JA4 of relay J A connects the control end of timing control circuit.Described wherein one group of power save circuit is made of capacitor C 18 and the resistance R 34 that is connected between capacitor C 18 inputs and the output.

The operation principle of carrying out control circuit is: under the normal situation, contactor JK1-JK3 is in normally off, is connected 3 groups of power-supply devices of letter base station through the normally-closed contact of contactor JK1-JK3 by the alternating current of 3 phase 380V of external world's input.Under interchange 380V powered normal situation, communication base station and electric power equipment protection device was in detected state.When taking place because during situations such as thunderbolt, the fluctuation of electrical source of power electric voltage exception, under-voltage, the phase failure, transfinite testing circuit, the phase failure and undervoltage detection circuit, neutral line testing circuit of sample circuit, voltage can be automatically detects the data volume of this variation, normally-closed contact through carrying out control circuit control contactor JK1, JK2, JK3 disconnects again, cut-out is to the power supply of base station AC power equipment, the power supply of base station equipment has been automatically converted to the direct current supply of the battery pack 48V that provides for oneself the base station this moment, the operate as normal of base station equipment has not been constituted influence.During the guard mode that after contactor JK1-JK3 is in the main contacts adhesive, disconnects; carrying out control circuit control timing control circuit starts automatically; after the timing of setting; timing circuit can be removed original guard mode automatically; the contactor JK1-JK3 that carries out control circuit is discharged; reclose the power supply to base station AC power equipment, circuitry reverts to normal detected state again automatically.

Described timing control circuit is made up of relay J A4, capacitor C 27, three groups of timing circuits that structure is identical and parallel with one another, resistance R 30, one-way SCR DR5, capacitor C 28-C29, diode D12, relay J B, relay J A4 one end links to each other with the output of carrying out control circuit, the input of another termination timing circuit, the output order of timing circuit is to the control utmost point of controllable silicon DR5, the anode of one-way SCR links to each other with relay J B, the Control Node JB1﹠amp of relay J B; 2 are connected to the input control end of carrying out control circuit.Described wherein one group of timing circuit is made up of timing selecting switch S2, programmable Timer integration module IC1, resistance R 21-R23, R31, capacitor C 30-C31, diode D5, the timing of timing circuit can be selected arbitrarily at 10 minutes, 20 minutes, 30 minutes 3 gears by timing selecting switch S2, S3, S4 control, and programmable Timer integration module IC1-IC3 selects CD4541 for use.

The timing control circuit operation principle is: with 10 minutes timing circuits was example, the work of timing control circuit is controlled by the relay J A that carries out control circuit, when complete machine is in normal detected state, relay J A is failure to actuate, the relay J A4 of timing control circuit is in the disconnection shape, and timing control circuit is not worked; When complete machine is operated in guard mode; because relay J A action; relay J A4 connects the timing control circuit power supply starts working timing control circuit; the programmable time of programmable Timer integration module IC depends on external timing capacitance resistance ware R21 and C31; in the circuit production process, can change the length of timing by the size that changes the resistance of adjusting R21; capacitor C 30 and resistance R 23 are formed the start clear circuit; utilize the effect that discharges and recharges of capacitance resistance ware; the moment of just switching on; give high level pulse voltage of the 5th pin clear terminal of programmable Timer integration module CD4541, make CD4541BD begin concussion and timing thus.After reaching selected time, the 8th pin output of programmable Timer integration module CD4541 will be exported a high level, be added to the control utmost point of one-way SCR DR5 through dropping resistor R31, isolating diode D5, make one-way SCR DR5 triggering and conducting, relay J B adhesive.The effect of capacitor C 29 is clutter interference signals that filtering enters one-way SCR DR5, guarantees input voltage relatively stable of the one-way SCR DR5 control utmost point.Because the power supply of relay J A, JD is by being in the JB1﹠amp that often connects state at ordinary times; 2 connect, and 1 and 2 two contact of its relay J B is in parallel uses relay J B1﹠amp; 2 disconnection discharges the relay J A of the execution control circuit that is in the protection operating state, thereby causes that contactor JK1, the JK2, the JK3 that are subjected to its control discharge, and makes to be in disconnected the base station Alternating Current Power Supply is reclosed.JB1﹠amp; 2 movable contact is when disconnecting normally closed contact relay J A end, automatically connect normally opened contact again, since normally opened contact be connected publicly, the power positive end shorted to earth of testing circuit, under-voltage and open-phase detection circuit so the voltage that is connected with the execution control circuit can be transfinited, thereby the remaining capacity energy storage of this branch road of releasing rapidly causes the relay J A and contactor JK1, JK2, the JK3 that carry out control circuit to return to normal condition rapidly.After relay J A discharged, JA4 disconnected, and cuts off the direct current supply to timing control circuit simultaneously, and timing control circuit quits work, and one-way SCR DR5 and relay J B discharge, and circuitry returns to normal detected state again.The effect of timing circuit relay J B two ends and the capacitor C 28 that connects is, after JA4 discharges and after the dc power supply cut-out with timing control circuit, can prolong suction and the retention time of relay J B, with avoid relay J B and JA time action, formed reforming phenomena.

The effect of Fig. 2 repeat circuit JA, JB, JC, JD next door and the diode that connects is in order to prevent that when the relay sudden power, the inverse electromotive force that relay coil produced is to the influence of circuit devcie.The effect of relay J D is in order to expand the number of contacts of relay J A, and the contact that relay J D provides is mainly used in the external controlled quentity controlled variable of external connection rotating ring monitoring.

Power circuit of the present utility model provides 48V, 24V, 3 groups of DC power supply of 12V.Wherein the 48V battery pack of inside of base station is taken from 48V direct current supply; 24V is provided with the DC-DC translation circuit that relevant peripheral component is formed by the DC-DC conversion IC of special use; The DC-DC translation circuit that the 12V direct current is made up of three terminal regulator LM7812 and relevant peripheral component provides.

The 24V DC power-supply circuit of power circuit provides Schottky diode D10, filter capacitor C23, C24, C25, the C26 of afterflow and prevents that the diode D11 of error-polarity connection of power supply, battery main switch S1 from forming by the special-purpose conversion IC of DC-DC and peripheral control bleeder circuit R19, R18, DC filtering inductance L 1, for LI; 12V direct current supply is formed by the LM7812 three terminal regulator with output filter capacitor C21, C22.

The operation principle of power circuit is: the 48V power supply adopts the mode of directly being powered by the base station battery group, divide two-way output through 48V battery input interface FC, battery main switch S1, after preventing the diode D11 of error-polarity connection of power supply, one the tunnel is directly connected to an end of the normally opened contact of contactor JA1, JA2, JA3, power supply as control JK1, JK2, JK3 winding coil, first pin that another road is added to DC-DC conversion integrated circuit LM2576HVT-ADJ is an input, through being output by tripod after the DC-DC conversion, output 24V voltage.LM2576HVT-ADJ is a feedback end, by the dividing potential drop of external resistance R 19, R18, can obtain the direct voltage of a stable 24V at tripod.LI is a filter inductance, and D10 is the Schottky diode that continuous current circuit is provided for LI, and C23, C24, C25, C26 are filter capacitors, and wherein C23, C25 are the spuious high fdrequency components that is used for the filtering DC circuit.

The DC power supply of 24V is mainly transfinite testing circuit and the phase failure, undervoltage detection circuit and LM7812 three terminal regulator of voltage DC power supply is provided.

The 12V power supply is obtained by conversion by three terminal regulator LM7812 from the 24V dc terminal of this machine.Wherein capacitor C 21, C22 are the output filtered electrical of three terminal regulator LM7812, and C21 is mainly used in the spuious high fdrequency component in the filtering 12V DC power supply.

The 12V DC power supply is mainly used in timing control circuit, external sound and light alarm, external phase breaking alarm circuit usefulness.

The indicator light of this device has two, a power supply indicator that is mounted on the cabinet panel, and another is mounted in the power connection status indicator lamp on the wiring board.Power supply indicator is made up of dropping resistor R37 and light-emitting diode F1, adopts 48V direct current supply, and after battery main switch S1 connected, F1 was promptly bright.The power connection status indicator lamp is mainly used in the power connection indication of wiring board, is made up of dropping resistor R20 and light-emitting diode F2, and voltage is taken from the 12V output of three terminal regulator LM7812, is used to indicate the normal condition of this device power circuit.

The utility model also can external rotating ring supervisory control system circuit.External rotating ring supervisory control system circuit is a function expanded circuit of this device, and purpose is to make this device carry out that voltage transfinites, during under-voltage, open phase protection action, can simultaneously relevant information conducted the rotating ring supervisory control system to remote monitoring.The information conduction pattern of this device mainly is to finish by JD and these two two groups of amounts of opening the light that relay provided of JC, and draws by outer connector, is connected with the input of the rotating ring supervisory control system of communication base station inside.

Claims

1, communication base station and electric power equipment protection device, it is characterized in that this device comprises sample circuit, the voltage testing circuit that transfinites, under-voltage and open-phase detection circuit, neutral line testing circuit, carry out control circuit and timing control circuit, wherein, the input termination power power-line of sample circuit, its output connects the voltage testing circuit that transfinites respectively, the input of under-voltage and open-phase detection circuit and neutral line testing circuit, the voltage testing circuit that transfinites, the output of under-voltage and open-phase detection circuit and neutral line testing circuit is connected with the input of carrying out control circuit respectively, carry out control circuit and divide two-way output, one tunnel output connects the input of timing control circuit, the input of letter base station power equipment is connected in another road output, and the output termination of timing control circuit is carried out the input of control circuit.

2, communication base station and electric power equipment protection device according to claim 1, it is characterized in that described sample circuit is made of four groups of structure sample circuits identical and parallel with one another, the input of three groups of sample circuits connects power power-line respectively, its output connects the transfinite input of testing circuit and under-voltage and open-phase detection circuit of voltage respectively, the input of another group sample circuit connects to neutral, the connect to neutral input of testing circuit of its output, sample circuit wherein one group by AC transformer B1, rectifier bridge DX1 forms, the first utmost point of AC transformer B1 connects power power-line, and the inferior utmost point of AC transformer B1 connects the input of rectifier bridge DX1.

3, communication base station and electric power equipment protection device according to claim 1, it is characterized in that the described voltage testing circuit that transfinites is made of three groups of structure voltages identical and parallel with one another testing circuit that transfinites, wherein one group by diode D2, capacitor C 1-C2, resistance R 1-R2, one-way SCR DR1 forms, resistance R 1-R2 constitutes bleeder circuit, the output of the corresponding one group of sample circuit of input termination of this bleeder circuit, the output of bleeder circuit is via capacitor C 1, diode D2, the π formula filter circuit order that capacitor C 2 is formed is to the control utmost point of controllable silicon DR1, and the anode of one-way SCR DR1 connects the input of carrying out control circuit.

4, communication base station and electric power equipment protection device according to claim 1, it is characterized in that described under-voltage and open-phase detection circuit are made of three groups of structure under-voltage and open-phase detection circuits identical and parallel with one another, wherein one group by resistance R 15-R17, capacitor C 15-C17, diode D16-18, triode Q5-Q6, relay J C forms, resistance R 15-R16 constitutes bleeder circuit, the input of bleeder circuit is connected with the output of corresponding one group of sample circuit, capacitor C 15-C16 is connected to input and the output of diode D16 respectively, capacitor C 15-C16 and diode D16 constitute π formula filter circuit jointly, the output of bleeder circuit connects the base stage of triode Q5 through π formula filter circuit, the base stage of the collector connecting transistor Q6 of triode Q5, node between triode Q5 and triode Q6 is connected to resistance R 17, its another node is through capacitor C 17 ground connection, the collector electrode of triode Q6 is succeeded the input of electrical equipment JC through diode D17, be connected to diode D18 between the input of relay J C and the output, the output termination of relay J C is carried out the input of control circuit.

5, communication base station and electric power equipment protection device according to claim 1, it is characterized in that described neutral line testing circuit is made up of divider resistance R7-R8, capacitor C 7-C8, diode D7, one-way SCR DR4, resistance R 7-R8 constitutes bleeder circuit, the output of the corresponding one group of sample circuit of input termination of this bleeder circuit, the π formula filter circuit order that the output of bleeder circuit is formed via capacitor C 7, diode D7, capacitor C 8 is to the control utmost point of controllable silicon DR4, and the anode of one-way SCR DR4 connects the input of carrying out control circuit.

6, communication base station and electric power equipment protection device according to claim 1, it is characterized in that described execution control circuit is by relay J A, JD, diode D1, contactor JK1-JK3, the contactor power save circuit is formed, the contactor power save circuit is made of three groups of structure power save circuits identical and parallel with one another, relay J A parallel with one another, the input of JD respectively with the voltage testing circuit that transfinites, under-voltage and open-phase detection circuit, the output of neutral line testing circuit connects, the Control Node JA1-JA3 of relay J A is connected through the input of contactor power save circuit with contactor JK1-JK3 respectively, and the Control Node JA4 of relay J A connects the control end of timing control circuit.

7, communication base station and electric power equipment protection device according to claim 6 is characterized in that described wherein one group of power save circuit is made of capacitor C 18 and the resistance R 34 that is connected between capacitor C 18 inputs and the output.

8, communication base station and electric power equipment protection device according to claim 1, it is characterized in that described timing control circuit is by relay J A4, capacitor C 27, three groups of timing circuits that structure is identical and parallel with one another, resistance R 30, one-way SCR DR5, capacitor C 28-C29, diode D12, relay J B forms, relay J A4 one end links to each other with the output of carrying out control circuit, the input of another termination timing circuit, the output order of timing circuit is to the control utmost point of controllable silicon DR5, the anode of one-way SCR links to each other with relay J B, the Control Node JB1﹠amp of relay J B; 2 are connected to the input control end of carrying out control circuit.

9, communication base station and electric power equipment protection device according to claim 8 is characterized in that described wherein one group of timing circuit is made up of timing selecting switch S2, programmable Timer integration module IC1, resistance R 21-R23, R31, capacitor C 30-C31, diode D5.