CN201222650Y

CN201222650Y - Apparatus for monitoring and protecting power distribution of transformer house

Info

Publication number: CN201222650Y
Application number: CNU2008200775880U
Authority: CN
Inventors: 李文朝; 智兆华
Original assignee: BOFA ELECTRIC Co Ltd
Current assignee: BOFA ELECTRIC Co Ltd
Priority date: 2008-06-20
Filing date: 2008-06-20
Publication date: 2009-04-15
Anticipated expiration: 2018-06-20

Abstract

The utility model relates to a device for monitoring and protecting the electricity distribution of a transformer house, which belongs to the technical field of protecting and is used for solving the problem of circuit protecting. The technical proposal of the utility model is that the device is orderly connected with a signal collecting circuit, a single chip micro-computer, a driving circuit and a vacuum breaker, wherein the signal collecting circuit comprises an input circuit of transformer state signals, a primary side parameter detecting circuit and a secondary side parameter detecting circuit, the input ends of the circuits are respectively connected with a transformer state switch, a transformer primary circuit and a transformer secondary circuit, the output ends are connected with the input end of the single chip micro-computer, and the vacuum breaker is connected in the primary loop of the transformer in series. The device has perfect monitoring function, is convenient for all the protection and the unified management of data, and is also easy to realize the interconnecting between units and the remote monitoring.

Description

Distribution monitoring of a kind of transformer room and protective device

Technical field

The utility model relates to the device that a kind of distribution facility that is used for the transformer room detects and protects, and belongs to the resist technology field.

Background technology

The transformer room is the important component part of supply network; because faults such as overvoltage, under-voltage, overload, short circuit, transformer are unusual happen occasionally in supply network; monitoring and protective device must be set in the transformer room; with timely discovery and disengagement failure branch road; protection circuit and transformer prevent that fault from further enlarging.Existing power distribution protection device (as the petroleum transferring station in oil field, the power distribution protection device of injection station transformer room) generally is to adopt distributing instrument and circuit breaker to realize tranformer protection, low-voltage circuit protection and electric current, voltage monitoring.The defective of the maximum of this monitoring and protecting device is can not monitor, protect the inlet wire high-tension line low-voltage circuit, can not coordinate and manage, and can not upload data, can not provide necessary fault message to the maintenance personal.

Summary of the invention

The purpose of this utility model is to overcome the deficiencies in the prior art, provides a kind of monitoring function complete, and is convenient to transformer room's distribution monitoring and protective device to all are protected and data are carried out unified management.

The purpose of this utility model solves by following technical proposals:

Distribution monitoring of a kind of transformer room and protective device; form by the signal acquisition circuit, single-chip microcomputer U1, drive circuit and the vacuum circuit-breaker K that connect successively; described signal acquisition circuit comprises transformer state signal input circuit, primary side parameter detecting circuit and secondary side parameter detecting circuit; their input connects transformer state switch, circuit of transformer and transformer secondary circuit respectively; output connects the input of single-chip microcomputer U1, and described vacuum circuit-breaker K is series in the primary circuit of transformer.

Distribution monitoring of above-mentioned transformer room and protective device; described secondary side parameter detecting circuit is made up of three identical secondary side parameter detecting unit of structure; phase in the corresponding secondary side three-phase alternating current in each secondary side parameter detecting unit; by a voltage transformer pt; two current transformers and an electric energy computation chip U2 form; the input termination phase voltage of described voltage transformer pt; the Vin+ end of output termination electric energy computation chip U2; the input phase-connecting wire of the first current transformer CT1; the input of the output termination second current transformer CT2; the Iin+ end of the output termination electric energy computation chip U2 of the second current transformer CT2; the RESET of electric energy computation chip U2; SDI; SCLK and SDO end meet the P3.9 of single-chip microcomputer U1 respectively; P0.6; P0.4; the P0.5 end, the chip selection signal input CS of three electric energy computation chip U2 of three secondary side parameter detecting unit meets the P1.25 of single-chip microcomputer U1 respectively; P3.14; the P3.15 end.

Distribution monitoring of above-mentioned transformer room and protective device; described primary side parameter detecting circuit is made up of four identical primary current detecting units of structure; each primary current detecting unit is formed by current transformer CT3; the output signal of described current transformer CT3 connects the input of single-chip microcomputer U1 again through coupling resistance R9 behind two electric resistance partial pressures; the output of four primary current detecting units meets the P2.31 of single-chip microcomputer U1 respectively; P2.30; P0.28 and P0.27 end; the input of the current transformer CT3 of three primary current detecting units connects three phase lines of primary side respectively through a foreign current instrument transformer, the signal output part of the input connecting to neutral preface current sensor LX of the current transformer CT3 of another primary side current detecting unit.

Distribution monitoring of above-mentioned transformer room and protective device; described transformer state signal input circuit is made up of three identical status signal input units of structure; their input connects transformer temperature alarming switch respectively; heavy watt alarm switch and light watt of alarm switch; each status signal input unit is made up of photoelectrical coupler U3 and resistance; the output signal of each alarm switch connects the input of photoelectrical coupler U3 behind two electric resistance partial pressures; the output of photoelectrical coupler U3 connects the input of single-chip microcomputer U1 through coupling resistance R9, and the chip selection signal input CS of three electric energy computation chip U2 of three quadratic parameter detecting units meets the P1.25 of single-chip microcomputer U1 respectively; P3.14; the P3.15 end.

Distribution monitoring of above-mentioned transformer room and protective device; described drive circuit by; darlington array U6 and two relays are formed; the P2.19 end of single-chip microcomputer U1 meets the input IN1 of described darlington array U6 through photoelectrical coupler U4; the P2.18 end meets the input IN2 of darlington array U6 through photoelectrical coupler U5; the control coil of OUT1 termination first relay J 1 of darlington array U6; the control coil of OUT2 termination second relay J 2, the normally opened contact of first relay J 1 and second relay J 2 is controlled switching winding and the closing coil of vacuum circuit-breaker K respectively.

Distribution monitoring of above-mentioned transformer room and protective device are set up the GPRS communication module, and described GPRS communication module connects P0.8, the P0.9 end of single-chip microcomputer U1.

The utility model utilizes signal acquisition circuit that information such as transformer state, primary current, secondary voltage current waveform and active power, reactive power, power factor, electric weight are detected in real time; by single-chip microcomputer the information of being gathered is handled; and as the case may be to drive circuit output control signal; drive vacuum circuit-breaker by drive circuit and finish switching an on-the-spot high-tension line; realization is to reliable, the effectively protection of high-tension line and low-voltage circuit, and the GPRS module is used for the wireless data of uploading.The utility model not only monitoring function is complete, and is convenient to unified management is carried out in all protections and data, is easy to realize the interconnected and remote monitoring in unit.

Description of drawings

Fig. 1 is an electric theory diagram of the present utility model;

Fig. 2 is the electrical schematic diagram of transformer state signal input circuit of the present utility model and primary side parameter detecting circuit;

Fig. 3 is the electrical schematic diagram of secondary side parameter detecting circuit;

Fig. 4 is the electrical schematic diagram of drive circuit.

Each label is among the figure: U1, single-chip microcomputer, U2, electric energy computation chip, U3, U4, U5, photoelectrical coupler, U6, darlington array, J1, J2, relay, CTA, CTB, CTC, CT1, CT2, CT3, current transformer, PT, voltage transformer, Kt, transformer temperature alarming switch, KG1, heavy watt alarm switch, KG2, light watt of alarm switch, K, vacuum circuit-breaker, Ks, the vacuum circuit-breaker closing coil, Kr, the vacuum circuit-breaker switching winding, LX, zero sequence current sensor, T, transformer, XS, display, H1, H2, H3, H4, the primary current detecting unit, L1, L2, L3, the quadratic parameter collecting unit, Z1, Z2, Z3, the transformer state signal input unit.

Embodiment

The utility model is mainly used in the petroleum transferring station in oil field, the distribution monitoring and protecting of injection station transformer room; the utility model can monitor, protect high/low line ball road simultaneously; to all protection unified managements, and the record trouble waveform, by the wireless data of uploading of GPRS.

Referring to Fig. 2, current transformer CTA, CTB, CTC and zero sequence current sensor LX are the parts among the vacuum circuit-breaker K, and the utility model also can adopt independently current transformer and zero sequence current sensor in order to gather the primary current signal when specifically implementing.Among Fig. 2, Vref is a reference voltage, and resistance R 1, R2 are the divider resistance of current transformer CT3 output signal, and resistance R 3 is a coupling resistance, and voltage-stabiliser tube D1 plays clamping action.Resistance R 7, R8 are the divider resistance of transformer state signal, and capacitor C1 strobes, and resistance R 9 is the output coupling resistance of photoelectrical coupler U3, and resistance R 6 is a pull down resistor.

Referring to Fig. 3, the output signal of voltage transformer pt connects the Vin+ end of electric energy computation chip U2, and resistance R 4 has the effect of conditioning signal amount; Diode D2, D3 play clamping action.Current signal is gathered by current transformer CT1, is input to the Iin+ end of electric energy computation chip U2 again after current transformer CT2 conversion, and resistance R 5 has the effect of conditioning signal amount; Diode D4, D5 play clamping action.Connect the input of single-chip microcomputer U1 after the data wire of three electric energy computation chips is connected in parallel, select to want the chip of reading of data by chip selection signal.

Referring to Fig. 4, the control signal of single-chip microcomputer U1 output is through photoelectric coupler isolation, control relay J1, J2 after darlington array U6 amplifies again, during relay J 1 closure, vacuum circuit-breaker switching winding Kr gets electric, and vacuum circuit-breaker K is disconnected, during relay J 2 closures, vacuum circuit-breaker closing coil Ks gets electric, makes vacuum circuit-breaker K closure.

During concrete enforcement, display XS, keyboard and other communication interface can also be set, increase function of the present utility model.

The system works principle: the utility model is formed monitoring and protection part by ARM single-chip microcomputer and peripheral circuit, and can be realized centralized monitor by communication interface by the controllable component of vacuum circuit-breaker as protection.Single-chip microcomputer is kept at the current instantaneous value that collects in the round-robin queue; protection parameter according to current sample rate current size and setting is made real-time judge; thereby when line fault, make quick response; control vacuum circuit-breaker disjunction faulty line; and the current data in the preservation round-robin queue is as the waveform of malfunction protective current; single-chip microcomputer is gathered the transformer running status simultaneously in real time, makes a response when transformer is unusual, reaches the purpose of protection circuit and transformer.Single-chip microcomputer provides information such as line voltage distribution current waveform and voltage, electric current, active power, reactive power, power factor, electric weight by electric energy measure chip monitoring low-pressure side electrical quantity for the user.Adopt high performance 32 ARM single-chip microcomputers as main control chip, make system satisfy the hard real-time demand fully.System can carry out closely centralized monitor by 485 interfaces, also can carry out remote monitor by the GPRS communication module.

The signal of each integrated circuit is: U1 adopts LPC2214, and U2 adopts CS5460A, and U3, U4, U5 adopt TLP521, and U6 adopts ULN2003A.

Claims

1, a kind of transformer room's distribution monitoring and protective device; it is characterized in that; it is made up of the signal acquisition circuit, single-chip microcomputer (U1), drive circuit and the vacuum circuit-breaker (K) that connect successively; described signal acquisition circuit comprises transformer state signal input circuit, primary side parameter detecting circuit and secondary side parameter detecting circuit; their input connects transformer state switch, circuit of transformer and transformer secondary circuit respectively; output connects the input of single-chip microcomputer (U1), and described vacuum circuit-breaker (K) is series in the primary circuit of transformer.

2; according to monitoring of the described transformer room of claim 1 distribution and protective device; it is characterized in that; described secondary side parameter detecting circuit is made up of three identical secondary side parameter detecting unit of structure; phase in the corresponding secondary side three-phase alternating current in each secondary side parameter detecting unit; by a voltage transformer (PT); two current transformers and an electric energy computation chip (U2) are formed; the input termination phase voltage of described voltage transformer (PT); the Vin+ end of output termination electric energy computation chip (U2); the input phase-connecting wire of first current transformer (CT1); the input of output termination second current transformer (CT2); the Iin+ end of the output termination electric energy computation chip (U2) of second current transformer (CT2); the RESET of electric energy computation chip (U2); SDI; SCLK and SDO end meet the P3.9 of single-chip microcomputer (U1) respectively; P0.6; P0.4; the P0.5 end, the chip selection signal input CS of three electric energy computation chips (U2) of three secondary side parameter detecting unit meets the P1.25 of single-chip microcomputer (U1) respectively; P3.14; the P3.15 end.

3; according to claim 1 or distribution monitoring of 2 described transformer rooms and protective device; it is characterized in that; described primary side parameter detecting circuit is made up of four identical primary current detecting units of structure; each primary current detecting unit is formed by current transformer (CT3); the output signal of described current transformer (CT3) connects the input of single-chip microcomputer (U1) again through coupling resistance R9 behind two electric resistance partial pressures; the output of four primary current detecting units meets the P2.31 of single-chip microcomputer (U1) respectively; P2.30; P0.28 and P0.27 end; the input of the current transformer of three primary current detecting units (CT3) connects three phase lines of primary side, the signal output part of the input connecting to neutral preface current sensor (LX) of the current transformer of another primary side current detecting unit (CT3) respectively through a foreign current instrument transformer.

4; according to monitoring of the described transformer room of claim 3 distribution and protective device; it is characterized in that; described transformer state signal input circuit is made up of three identical status signal input units of structure; their input connects transformer temperature alarming switch respectively; heavy watt alarm switch and light watt of alarm switch; each status signal input unit is made up of photoelectrical coupler (U3) and resistance; the output signal of each alarm switch connects the input of photoelectrical coupler (U3) behind two electric resistance partial pressures; the output of photoelectrical coupler (U3) connects the input of single-chip microcomputer (U1) through coupling resistance (R9), and the chip selection signal input CS of three electric energy computation chips (U2) of three quadratic parameter detecting units meets the P1.25 of single-chip microcomputer (U1) respectively; P3.14; the P3.15 end.

5; according to monitoring of the described transformer room of claim 4 distribution and protective device; it is characterized in that; described drive circuit is made up of darlington array (U6) and two relays; the P2.19 end of single-chip microcomputer (U1) meets the input IN1 of described darlington array (U6) through photoelectrical coupler (U4); the P2.18 end meets the input IN2 of darlington array (U6) through photoelectrical coupler (U5); the control coil of OUT1 termination first relay (J1) of darlington array (U6); the control coil of OUT2 termination second relay (J2), the normally opened contact of first relay (J1) and second relay (J2) is controlled the switching winding and the closing coil of vacuum circuit-breaker (K) respectively.

6, according to monitoring of the described transformer room of claim 5 distribution and protective device, it is characterized in that, set up the GPRS communication module, described GPRS communication module connects P0.8, the P0.9 end of single-chip microcomputer (U1).