CN203387170U - Self-powered protector - Google Patents

Abstract

The utility model relates to a self-powered protector, comprising a first measurement power-drawing circuit and a second measurement power-drawing circuit which are respectively connected with an A phase and a B phase of an alternating-current power supply. The first measurement power-drawing circuit and the second measurement power-drawing circuit are connected to a voltage limiting circuit through a first rectifying circuit and a second rectifying circuit, respectively. The voltage limiting circuit is connected to a processor through a power supply module. The processor is connected with a tripping relay. The self-powered protector is characterized by further comprising a boost circuit which is connected with the processor, the voltage limiting circuit, and an energy storage capacitor, and the energy storage capacitor is connected with the tripping relay. The protector can work stable in usage occasions without a stable operation power supply and reliably trip a circuit breaker in close short circuit no-voltage situations, thereby greatly improving the protection stability. When a pre-existed fault occurs in the circuit, the protector can trip rapidly, and the tripping time is far shorter than that of a product supplied with power solely through a CT (current transformer).

Description

A kind of Self-power protective device

Technical field

The utility model relates to a kind of electric protection device, and specifically a kind of Self-power protective device, belong to electronic technology field.

Background technology

In electric power system, due to factors such as external force, overvoltage, ageing of insulation, operate miss, design defect, the faults such as ground connection, short circuit, overload can occur, operations staff's safety and equipment is worked the mischief; The effect of protective relaying device is exactly normal, the undesired and malfunction of distinguishing electric power, and makes corresponding processing, as signaled and tripping operation; Along with application and the popularization of computer technology in electric power system, oneself combines protection, measurement, control, communication in the microcomputer protecting controller of one through upgrading to protective relaying device.

But in the course of work of these microcomputer protecting devices, a stable working power need to be arranged, just can safely and steadily run, this power supply is operating power.In the unsettled situation of operating power, malfunction, the tripping of protective relaying device may appear, cause that power supply quality descends, has a power failure, the accident such as device damage even; Existing operating power is generally provided by following four kinds of modes:

A, factory (power plant), stand (transformer station) use transformer-supplied,

Its principle for by factory, standing provides AC power with transformer, but there is following defect in this supply power mode: at first, supply voltage is larger with power network fluctuation; Secondly, in power supply, the surge composition is larger, easily causes protective relaying device to damage; Again, while being short-circuited fault, near the voltage even decompression that sharply descends fault point, this supply voltage also descends thereupon, protective relaying device will be because of the decompression tripping, thereby causes fault spread.

B, inlet wire PT(voltage transformer) power supply;

Get can instrument transformer in order to install in the transforming plant lead-in side for its principle, and the operating power of system is provided, and the mode of the defect that this mode exists and Tong Chang, the use of standing transformer-supplied is similar, mainly comprise following some: 1, supply voltage is larger with power network fluctuation; 2, in power supply, the surge composition is larger, easily causes protective relaying device to damage; While 3, being short-circuited fault, near the voltage even decompression that sharply descends fault point, this supply voltage also descends thereupon, and protective relaying device will be because of the decompression tripping, thereby causes fault spread.

C, DC power supply panel;

Its principle is charged by transformer alternating power supply accumulators group for use factory (power plant), stand (transformer station), provide reliable and stable direct current operative power source after batteries being adjusted to voltage again, the defect that this mode exists is as follows: 1, the direct current cabinet investment is larger, and increases the line service amount; 2, batteries is higher to the environment for use temperature requirement, is generally 0～40 ℃; 3, the life of storage battery is shorter.

D, special-purpose CT(current transformer) power supply;

Its principle is: use independently power taking CT(current transformer) to device, power, there is following defect in this mode: 1, need extra CT(current transformer), increase cost and maintenance workload, 2, when once large current failure occurring, power taking CT may occur saturated, cause and can't power to device, can't trip thereby may cause large current failure timer.3., when pre-volt fault occurs circuit, operate time is long.Do not have the disengagement failure point, the function of protection circuit.

In recent years, along with the change of urban form, the ring main unit of preassembled transformer station (box-type substation) and high reliability is adopted in a large number.Both all have the characteristics such as compact conformation, reliable in action, and have combined installation in device fabrication producer, and on-the-spot needs a small amount of pedestal construction to get final product, and the installation time is very short, has improved greatly the efficiency of power construction.But because both generally adopt factory, standing provides operating power with transformer or inlet wire PT; when closely being short-circuited fault; the operating power decompression probably appears; thereby cause relay protection device tripping or malfunction; and inlet wire PT(voltage transformer) more difficult maintenance in practice; be prone to fault, even can explode, safety factor is not high.

The utility model content

The utility model will solve protective device low defect of Reliability of Microprocessor when short trouble of conventional AC power supply; thereby provide a kind of and can by operating power, not get final product the microcomputer protecting device of steady operation, microcomputer protecting device can be promoted at preassembled transformer station and ring main unit.

For solving the problems of the technologies described above, the utility model is achieved through the following technical solutions:

A kind of Self-power protective device, comprise the first measurement power-supply circuit and the second measurement power-supply circuit that are connected respectively mutually with C with the A phase of AC power, described the first measurement power-supply circuit and second is measured power-supply circuit and is connected to pressure limiting circuit by the first rectification circuit and the second rectification circuit respectively, described pressure limiting circuit is connected to processor by power module, described processor connects tripping relay, it is characterized in that, also comprise booster circuit, described booster circuit connects respectively described processor, described pressure limiting circuit and storage capacitor, described storage capacitor is connected with described tripping relay.

Also comprise battery unit, described battery unit is connected between described power module and described booster circuit by switch.

Described tripping relay comprises relay and breaking coil, and described relay one end is connected with described processor, and its contact connects respectively storage capacitor and breaking coil.

Described booster circuit is the BOOST booster circuit.

Also be connected with liquid crystal display and keyboard on described processor.

Also be connected with indicator light and communication interface on described processor.

The output voltage of described booster circuit is 70V.

Described processor adopting arm processor.

Described pressure limiting circuit is the 24V pressure limiting circuit.

Described battery unit is the 24V lithium battery

Technique scheme of the present utility model has the following advantages compared to existing technology:

(1) Self-power protective device described in the utility model, comprise booster circuit, and described booster circuit connects respectively described processor, described pressure limiting circuit and storage capacitor, and described storage capacitor is connected with described tripping relay; This device can be at the use occasion steady operation without the stable operation power supply, and while closely short circuit decompression occurring, the reliable tripping circuit breaker of energy, make the stability of protection be greatly improved; While occurring pre-volt fault in circuit, can trip rapidly; Trip time is far smaller than depends merely on the CT powered products; This is the place that this product design is better than product of the same type, and this device has obtained popularization on preassembled transformer station (box-type substation) and ring main unit, and the user is reflected well.

(2) Self-power protective device described in the utility model, comprise a battery unit, makes this application of installation when preassembled transformer station (box-type substation) or ring main unit, do not need extra power supply CT; And, when large current failure occurs primary current, controller can work.

(3) Self-power protective device described in the utility model, also be provided with liquid crystal display, keyboard, indicator light and communication interface, when can inputting instruction, the information such as operating state of this device passed to the user in time.

The accompanying drawing explanation

For content of the present utility model is more likely to be clearly understood, below in conjunction with accompanying drawing, the utility model is described in further detail, wherein,

Fig. 1 is the structured flowchart of Self-power protective device described in the utility model;

Fig. 2 is the structured flowchart of an embodiment of Self-power protective device described in the utility model.

Embodiment

The embodiment of Self-power protective device described in the utility model below is provided.

embodiment 1

The structure of Self-power protective device described in the utility model as shown in Figure 1, it comprises the first measurement power-supply circuit and the second measurement power-supply circuit be connected respectively mutually with C with the A phase of AC power, described the first measurement power-supply circuit and second is measured power-supply circuit and is connected to pressure limiting circuit by the first rectification circuit and the second rectification circuit respectively, described pressure limiting circuit is preferably the 24V pressure limiting circuit, described pressure limiting circuit is connected to processor by power module, described processor preferably adopts arm processor, described processor connects tripping relay, also comprise booster circuit, described booster circuit preferably adopts the BOOST booster circuit, the output voltage of described booster circuit is preferably 70V, described booster circuit connects respectively described processor, described pressure limiting circuit and storage capacitor, described storage capacitor is connected with described tripping relay, described tripping relay comprises relay and breaking coil, and as shown in Figure 2, described relay one end is connected with described processor, and its contact connects respectively storage capacitor and breaking coil.

This device operation principle is as follows: by booster circuit, storage capacitor is charged; When the outside line fault being detected, tripping relay starts, and with the stored electric energy of tripping operation storage capacitor, starts the circuit breaker trip coil; This device can be at the use occasion steady operation without the stable operation power supply, and while closely short circuit decompression occurring, the reliable tripping circuit breaker of energy, make the stability of protection be greatly improved; While occurring pre-volt fault in circuit, can trip rapidly, the trip time is far smaller than depends merely on the CT powered products.

embodiment 2

Self-power protective device described in the utility model also comprises battery unit, and as shown in Figure 1, described battery unit is connected between described power module and described booster circuit by switch, and described battery unit is the 24V lithium battery preferably.

This device employing CT(current transformer) the energy mode of getting that power taking and lithium battery combine; A phase or the input of C phase current, can maintain the normal operation of this device, and, to built-in battery unit charging, while inputting without electric energy, this device, by internal cell unit uninterrupted power supply, can be worked 36 hours.

embodiment 3

Preferably also be connected with liquid crystal display and keyboard on the described processor of Self-power protective device described in the utility model; Also be connected with indicator light and communication interface on described processor, as other disposable execution modes, can also connect some this areas input-output equipment commonly used.

Obviously, above-described embodiment is only for example clearly is described, and is not the restriction to execution mode.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without also giving all execution modes.And the apparent variation of being extended out thus or change are still among protection range of the present utility model.

Claims (10)

1. a Self-power protective device, comprise the first measurement power-supply circuit and the second measurement power-supply circuit that are connected respectively mutually with C with the A phase of AC power, described the first measurement power-supply circuit and second is measured power-supply circuit and is connected to pressure limiting circuit by the first rectification circuit and the second rectification circuit respectively, described pressure limiting circuit is connected to processor by power module, described processor connects tripping relay, it is characterized in that, also comprise booster circuit, described booster circuit connects respectively described processor, described pressure limiting circuit and storage capacitor, described storage capacitor is connected with described tripping relay.

2. Self-power protective device according to claim 1, is characterized in that, also comprises battery unit, and described battery unit is connected between described power module and described booster circuit by switch.

3. Self-power protective device according to claim 1 and 2, is characterized in that, described tripping relay comprises relay and breaking coil, and described relay one end is connected with described processor, and its contact connects respectively storage capacitor and breaking coil.

4. Self-power protective device according to claim 3, is characterized in that, described booster circuit is the BOOST booster circuit.

5. Self-power protective device according to claim 4, is characterized in that, also is connected with liquid crystal display and keyboard on described processor.

6. Self-power protective device according to claim 5, is characterized in that, also is connected with indicator light and communication interface on described processor.

7. Self-power protective device according to claim 6, is characterized in that, the output voltage of described booster circuit is 70V.

8. Self-power protective device according to claim 7, is characterized in that, described processor adopting arm processor.

9. Self-power protective device according to claim 8, is characterized in that, described pressure limiting circuit is the 24V pressure limiting circuit.

10. Self-power protective device according to claim 9, is characterized in that, described battery unit is the 24V lithium battery.

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