CN203761037U - Line-outage-free coordination instrument for eliminating defects of protection device - Google Patents

Abstract

The utility model discloses a defect elimination coordination instrument for a circuit non-stop protection device, which belongs to the technical field of circuit protection devices. At least include the following units: replacement protection device unit, used to replace the abnormal protection device on the line; inspection unit, used to detect the replacement protection device unit or the repaired abnormal protection device, to ensure normal operation, reliable action and correct indication, The current inspection status is transmitted to the status indication unit; the control unit issues inspection control instructions to control the working status of the inspection unit; the status indication unit is used to display the current working status. The utility model overcomes the problem that in the past, the operation switch and the line need to be powered off to deal with the failure of the protection device, affects the reliability of the power supply, and buryes the hidden danger of accidents for the safe operation of the equipment. The advantage of improving line reliability.

Description

Line non-stop protection device to eliminate defects with the instrument

technical field

The utility model belongs to the technical field of circuit protection devices.

Background technique

At present, when the 35kV, 10kV and below line protection devices have device abnormalities, or telemetry data, protection and circuit breaker position signals cannot be uploaded, and switches cannot be remotely controlled, etc., the dispatch monitoring will convey the defects to the maintenance work area; handle the above defects It is necessary to stop the switch to eliminate the defect of the equipment (hereinafter referred to as the defect elimination), which will cause a power outage to the user, which not only affects the normal production and life of the people, but also causes economic losses to the user and the factory, and also reduces the company's electricity sales. economic benefits of the company. However, some important users, such as factories and mines, cannot easily cut off the power. When the protection device has a general failure, it can only operate with a disease, resulting in some general defects that cannot be dealt with in time, burying hidden dangers for the safe operation of the equipment; some communication failures cannot be handled in time. The dispatching and monitoring department cannot grasp real-time information in time, cannot analyze the power flow distribution of the power grid, and cannot successfully complete the dispatching and distribution of electric energy.

Utility model content

The technical problem to be solved by the utility model is to provide a line non-stop power-off protection device to eliminate defects, so as to overcome the failure of the protection device in the past when the operating switch and the line need to be powered off, which affects the reliability of the power supply and cannot smoothly complete the power scheduling and distribution. The safe operation of the equipment will bury the hidden danger of accidents. It has the advantages of simple structure, convenient use, high efficiency, increased electricity sales, and improved line reliability.

In order to solve the problems of the technologies described above, the technical solution adopted by the utility model is:

A defect-elimination coordination instrument for a line non-stop protection device, which at least includes the following units:

Replace the protective device unit to replace the abnormal protective device on the line;

The inspection unit is used to detect the replacement protection device unit or the repaired abnormal protection device to ensure normal operation, reliable action and correct indication, and transmit the current inspection status to the status indication unit;

The control unit sends detection control instructions to control the working status of the inspection unit;

A status indicating unit is used to display the current working status;

The input end of the replacement protection device unit is connected to the working power supply, the output end of the replacement protection device unit is electrically connected to the input end of the inspection unit, the output end of the inspection unit is respectively connected to the input end of the switch cabinet and the status indication unit, and the control unit is respectively connected to the inspection unit and the status indication unit , and transmit the detection control instruction and detection signal to the inspection unit and the state indication unit, and the inspection unit and the switch cabinet are connected to each other.

The inspection unit includes an output inspection circuit, a self-inspection inspection circuit and a state inspection circuit, the output inspection circuit or the tripping and closing pulse input state inspection circuit issued by the self-inspection inspection circuit; the tripping and closing pulse input switch of the output inspection circuit and the self-inspection inspection circuit The cabinet and the switch cabinet are connected with the state inspection circuit.

The replacement protection device unit is a PSL641 protection device.

The replacement protective device unit is provided with a trip operation lockout and a recloser lockout.

The inspection unit is a DSP2-2A2B intermediate relay.

The status indication unit includes a trip signal indicator, a closing signal indicator, a self-check status indicator and an output status indicator.

The control unit is a toggle switch.

The beneficial effects produced by adopting the above-mentioned technical scheme are: the utility model overcomes the need for a power outage of the operating switch and the line in the past to deal with the failure of the protection device, which affects the reliability of the power supply, fails to complete the power dispatching and distribution smoothly, and buryes the hidden danger of accidents for the safe operation of the equipment. problems, including replacing the protection device unit, inspection unit, control unit and status indication unit, which has the advantages of simple structure, convenient use, high efficiency, increased electricity sales, and improved line reliability; the inspection unit includes output inspection circuit, self-inspection The inspection circuit and state inspection circuit can complete various types of inspection and detection; the replacement protection device unit adopts PSL641 protection device, a mature product of Nanjing Guodian Nanzi Power Grid Automation Co., Ltd., with many protection functions and excellent protection performance; the replacement protection device unit Equipped with tripping and reclosing operation lockout and reclosing lockout to prevent the instrument from misoperating the tripping and closing control switch on the PSL641 protection device after the replacement protection device unit of the instrument replaces the abnormal protection device of the working interval, causing the operation switch to trip by mistake. Or when there is no energy stored in the spring of the mechanism, the recloser of the replacement protection device can be blocked; the inspection unit is a DSP2-2A2B intermediate relay, the components are easy to obtain, and it is easy to use, and it can be used as an analog circuit breaker; the status indication unit includes a trip signal indicator light, a closing Gate signal indicator light, self-test status indicator light and output status indicator light can effectively communicate and indicate the current status; the control unit is a toggle switch, which can be operated manually, which is convenient for on-site use and has high efficiency.

Description of drawings

Below in conjunction with accompanying drawing and specific embodiment, the utility model is described in further detail.

Fig. 1 is the electric principle block diagram of the utility model.

Fig. 2 is a schematic circuit diagram of an embodiment of the utility model.

Fig. 3 is a working state circuit schematic diagram when Fig. 2 is connected to the working interval circuit.

Fig. 4 is a working state circuit schematic diagram when the protection device unit in Fig. 2 replaces the abnormal protection device of the working interval.

in:

S1, control the positive power knob,

S2, control the negative power knob,

S3, trip output knob,

S4, closing output knob,

S5, trip input knob,

S6, closing input knob,

S7, A phase current input polarity terminal,

S8, Phase A current input non-polar terminal,

S9, B-phase current input polarity terminal,

S10, B-phase current input non-polar terminal,

S11, phase C current input polarity terminal,

S12, C-phase current input non-polar terminal,

DK, control power switch,

WF, lock operation five anti-lock,

LP, locking and reclosing connecting piece,

QK, self-test/output switch,

ZJ, self-test/output switching intermediate relay,

TJ, trip signal relay,

HJ, closing signal relay,

FW, trip and close signal reset button,

TXD, trip signal indicator light,

HXD, closing signal indicator light,

ND, output status indicator light,

YD, self-test status indicator light,

1. Replace the protective device unit,

2. Inspection unit,

21. Output inspection circuit,

22. Self-test inspection circuit,

23. State inspection circuit,

3. Control unit,

4. Status indication unit,

5. Switchgear.

Detailed ways

Referring to Figures 1 to 4, the utility model discloses a defect-eliminating coordination instrument for a line non-stop protection device, which includes the following four units:

Replace the protection device unit 1 to replace the abnormal protection device on the line;

The inspection unit 2 is used to detect the replacement protection device unit 1 (i.e. self-inspection) or the repaired abnormal protection device (i.e. output), to ensure normal operation, reliable action, and correct indication, and transmit the current inspection status to the status indication unit 4;

The control unit 3 issues a self-inspection/output detection control command to control the working state of the inspection unit 2;

A status indication unit 4, used to display the current working status;

The input end of the replacement protection device unit 1 is connected to the working power supply, the output end of the replacement protection device unit 1 is electrically connected to the input end of the inspection unit 2, the output end of the inspection unit 2 is respectively connected to the input end of the switch cabinet 5 and the status indication unit 4, and the control unit 3 is respectively Connect the inspection unit 2 and the state indication unit 4, and transmit the self-inspection/output detection control instruction and self-inspection/output detection signal to the inspection unit 2 and the state indication unit 4, and the inspection unit 2 and the switch cabinet 5 are connected to each other.

Described inspection unit 2 comprises output inspection circuit 21, self-inspection inspection circuit 22 and state inspection circuit 23, output inspection circuit 21 or self-inspection inspection circuit 22 send out the trip pulse input state inspection circuit 23; Output inspection circuit 21 and self-inspection inspection circuit 23 The tripping and closing pulse of the inspection inspection circuit 22 is input into the switch cabinet 5, and the switch cabinet 5 is connected with the state inspection circuit 23.

The replacement protection device unit 1 is a PSL641 protection device, a mature product of Guodian Nanzi, with stable and excellent performance.

The replacement protection device unit 1 is provided with tripping and closing operation blocking and reclosing blocking to prevent misoperation.

The inspection unit 2 is a DSP2-2A2B intermediate relay, which is used as a simulated circuit breaker.

The status indication unit 4 includes a trip signal indicator TXD, a closing signal indicator HXD, a self-check status indicator YD and an output status indicator ND. The status indication is intuitive and clear, and it is convenient to effectively clarify the current working status.

The control unit 3 is a self-check/output switching switch, which is more convenient to operate manually and has high efficiency.

Each of these components:

1. PSL641: PSL641 is a line protection device produced by Guodian Nanzi. It is generally suitable for 35kV and below lines. It has three-stage phase-to-phase overcurrent protection, three-stage zero-sequence protection, and low-cycle protection. Currently, only its three-stage overcurrent protection is used. Protect. The utility model also only uses its three-section overcurrent protection function.

2. DK: DK is the DC power control switch of the instrument of the utility model, its input end is connected with terminal S1 S2, and its output end is connected with 4X4 and 4X7 terminals of PSL641.

3. WF: WF is the positive power supply lock switch for tripping and closing of the utility model instrument. After WF is closed, the utility model can send out the positive pulse of manual tripping and closing, preventing the protection device of the utility model instrument from replacing the operating fault protection device. During the process, the tripping and closing operation switch of the instrument protection device of the present utility model was accidentally operated, causing the operating high-voltage switch to trip by mistake.

4. LP: LP is the reclosing lock block. After LP is closed, the reclosing function of the protection device of the utility model exits. When the reclosing device of the running protection device exits or the high-voltage switch sends a signal that the spring has not stored energy, the LP is closed. Make the protective device of the present utility model withdraw from reclosing.

5. QK: QK is a switch for self-inspection/output. When QK is switched to "self-inspection", QK is closed, and the "self-inspection/output" relay ZJ acts.

6. ZJ: ZJ is the intermediate relay for self-inspection/output switching, controlled by QK. The two ends of the ZJ coil are applied with a voltage of 220 volts to act. After the ZJ acts, its normally open contact is closed and the normally closed contact is opened. The tripping positive pulse sent by the protection device of the present utility model is applied to an end of the tripping signal relay TJ coil of the present utility model through a pair of normally open contacts and S5 of 6X12 and ZJ of the device, and the TJ coil is added with a voltage of 220 volts. TJ action. The closing positive pulse sent by the protective device of the present utility model is applied to one end of the closing signal relay HJ coil of the present utility model through 6X14 of the device, another pair of normally open contacts of ZJ, S6, and the HJ coil is added with 220 Volts, HJ action. The third pair of normally open contacts of ZJ is closed, and the YD indicator light is luminous, indicating that the utility model is in the state of "self-checking". After QK is switched to the "output" position, there is no voltage at both ends of the ZJ coil, and its normally closed contact is closed. The trip positive pulse sent by the protection device of the present invention is added to the trip output through a pair of normally closed contacts of 6X12 and ZJ of the device. Terminal S3. When a short-circuit fault occurs in the line during fault handling, the protection device of the instrument of the utility model acts to trip the switch. The closing positive pulse sent by the protection device of the instrument of the utility model is added to the closing output terminal S4 through another pair of normally closed contacts of 6X14 and ZJ of the device. When a fault occurs on the line, the instantaneous fault switch trips, and the protection device of the utility model sends out a reclosing pulse to close the switch. The third pair of normally closed contacts of ZJ is closed, and the ND indicator lights up, indicating that the utility model is in the "output" state.

7. TJ: TJ trip signal relay, when the S5 terminal has a trip positive pulse input, TJ acts and maintains itself through its normally open contact, and its other pair of normally open contacts closes, and the trip signal indicator light TXD, indicating that there is a trip A positive pulse is applied to the S5 terminal.

8. HJ: HJ is the closing signal relay. When the S6 closing terminal has a positive closing pulse input, HJ acts and maintains itself through its normally open contact, and its other pair of normally open contacts closes, and the closing signal indicator light HXD lights up, indicating that a positive closing pulse is applied to the S6 terminal.

9. FW, FW is the reset button, press FW, HJ, TJ self-hold release.

10. S1～S2: S1～S2 are the control power input terminals, which are respectively connected to the +KM and –KM terminals of the protection screen or the terminal block of the switch cabinet.

11. S3~S4: S3~S4 are the tripping and closing output terminals, which are respectively connected to the tripping and closing terminals of the protection screen or the terminal block of the switch cabinet.

12. S5～S6: S5～S6 are the tripping and closing input terminals, which are respectively connected to the tripping and closing output terminals of the protection device to be faulted. After the faulty protection device is processed, its performance must be checked. Through the utility model TJ HJ checks its performance.

13. S7～S12: are the AC current input terminals, which are respectively connected to the terminals at both ends of the connecting piece of the three-phase current terminal block. After reliable connection, the connecting piece is opened. The three-phase current acquisition original of the protection device of the utility model is connected in series In the secondary current circuit of the transformer.

In Figure 3, DK is the control power switch of the working interval. The control power terminal, tripping and closing terminal, and current test terminal of the terminal block are equipped with spare screws. Connecting the control power will not cause the operating equipment to lose power, and the tripping and closing circuit The switch control circuit will not be disconnected when wiring, and the CT circuit will not be opened when the current loop is connected. It can be seen from Figure 3 that the AC current input circuit of each phase of the PSL641 protection device in the instrument is connected in parallel with the test terminal row, so there is no It will cause shunting of the protective CT circuit. When the self-inspection/output switching switch QK is switched to self-inspection, the tripping circuit of the instrument and the control circuit of the operating switch are in a disconnected state, which will not cause false tripping of the operating switch.

In Figure 4, it can be seen that the test terminal block is disconnected, and the AC current input circuit of the PSL641 protection device in this instrument is connected in series in the current circuit. The PSL641 protection device in this achievement has the ability to trip on line faults. Remove the tripping and closing wiring of the abnormal protection device and connect it to the tripping and closing input terminal of this product. After the abnormality is handled, use the self-test/output switching intermediate relay ZJ of this product for performance inspection.

On-site use steps:

1. The S1～S2 terminals are connected to the protection screen or the +KM, –KM terminals of the switch cabinet terminal block. After checking that the measurement is correct, close the DK, power on the instrument of the utility model, and input the protection setting value of the fault processing interval into the utility model. In the protection device of the new instrument, switch QK to "self-test", the self-test status indicator light YD lights up, and then use the relay protection tester to drive the PSL641 protection device of the utility model instrument, and turn the jumper of the PSL641 protection device of the utility model instrument. Closing operation switch, when the tripping signal indicator TXD and the closing signal indicator HXD all emit light correspondingly, it proves that the PSL641 protection device of the utility model instrument works normally, and has the conditions to replace the fault protection device.

2. Connect S7-S12 in series in the AC current loop of the fault treatment interval, check the sampling value of the PSL641 protection device of the utility model instrument, and proceed to the next step when the sampling value is correct and there is no abnormal signal.

3. Connect the S3~S4 terminals to the tripping and closing terminals of the protection screen or the terminal block of the switch cabinet respectively, switch QK to the "output" position, and the output status indicator ND lights up.

4. Remove the tripping and closing output wires of the fault protection device from the tripping and closing terminals, and connect them to the S5 and S6 terminals of the utility model instrument respectively. After the fault protection device is processed, use the TJ terminal of the utility model instrument , HJ test its performance.

5. After the fault protection device returns to normal, remove the tripping and closing output wires of the processed protection device from the S5 and S6 terminals respectively, and then connect them to the tripping and closing terminals of the terminal block, and disconnect the tripping and closing terminals from S3 , S4 connection, close the connecting pieces of the AC current terminal block, remove the wires connected to S7~S12, remove the wires connected to the +KM, –KM terminals and S1, S2, and the work is completed.

This instrument is suitable for 35kV, 10kV, 6kV lines equipped with a single protective device. When the protection device is abnormal, the replacement protection device unit of the instrument can be used to replace the abnormal protection device in the running interval for processing. After the processing is completed, the DSP2-2A2B intermediate relay of the instrument is used for state inspection. After the inspection results are normal, it is put into operation. , and then exit the instrument. In this way, when the protection device is abnormal, the switch and the line do not need to be powered off, and the user will no longer have the trouble of power outage caused by the lack of protection, and will not cause the reduction of electricity sales due to the lack of protection.

On-site implementation of this instrument, when the protection device is abnormal, the switch does not need to go through the power failure procedure. Taking a certain interval as an example, the control power supply is safely and correctly connected to the terminal block, without causing power failure of the operating protection device, and the CT secondary current is conveniently connected to the terminal block, without open circuit and shunting of the CT secondary circuit, tripping and closing output The terminal is connected to the switch control circuit, and there is no false tripping of the switch. After the operating protection device exits the tripping and closing, connect the tripping and closing line to the tripping and closing input terminal of the product. The time spent is as follows: it takes 10 minutes to go through the start-up procedures, 20 minutes to handle the wiring before handling, 95 minutes to deal with abnormalities, 45 minutes to protect the drive, 170 minutes in total, and 0 minutes for power outages. In the past, it took about 160 minutes to deal with abnormal protection after power outages , Therefore, using this result to eliminate the shortage every time, about 160 minutes of power outages are reduced, which improves the reliability of power supply and the company's electricity sales.

Claims (7)

1. a not cut protection device elimination defect cooperation instrument of circuit, is characterized in that, at least comprises with lower unit:

Replace protective device unit (1), in order to the abnormal protection device occurring on alternative routing;

Verification unit (2), replaces protective device unit (1) or the abnormal protection device after maintenance in order to detect, and guarantees working properly, reliable in action, indicating correct, and current test status is transferred to state indication unit (4);

Control unit (3), sends detection control command, in order to control test unit (2) operating state;

State indication unit (4), in order to show work at present running status;

Wherein replace protective device unit (1) input and connect working power; replacing protective device unit (1) output is electrically connected with verification unit (2) input; verification unit (2) output is connecting switch cabinet (5) input and state indication unit (4) respectively; control unit (3) connects respectively verification unit (2) and state indication unit (4); and detection control command and detection signal are transferred to verification unit (2) and state indication unit (4), verification unit (2) and switch cubicle (5) interconnect.

2. not cut protection device elimination defect cooperation instrument of circuit according to claim 1, it is characterized in that, described verification unit (2) comprises output checking circuit (21), self-inspection checking circuit (22) and thermodynamic state verification circuit (23), the breaker tripping and closing pulse input state checking circuit (23) that output checking circuit (21) or self-inspection checking circuit (22) send; The breaker tripping and closing pulse input switch cabinet (5) of output checking circuit (21) and self-inspection checking circuit (22), switch cubicle (5) is connected with thermodynamic state verification circuit (23).

3. not cut protection device elimination defect cooperation instrument of circuit according to claim 1, is characterized in that, described replacement protective device unit (1) is PSL641 protective device.

4. not cut protection device elimination defect cooperation instrument of circuit according to claim 3, is characterized in that, described replacement protective device unit (1) is provided with breaker tripping and closing operation locking and reclosing block.

5. not cut protection device elimination defect cooperation instrument of circuit according to claim 1, is characterized in that, described verification unit (2) is DSP2-2A2B auxiliary relay.

6. not cut protection device elimination defect cooperation instrument of circuit according to claim 1, is characterized in that, described state indication unit (4) comprises trip signal indicator light, switching signal indicator light, self-inspection status indicator lamp and output state indicator light.

7. not cut protection device elimination defect cooperation instrument of circuit according to claim 1, is characterized in that, described control unit (3) is diverter switch.