CN209982027U

CN209982027U - Embedded 10kV line protection device

Info

Publication number: CN209982027U
Application number: CN201920968798.7U
Authority: CN
Inventors: 董武刚; 李晓余; 李江峰
Original assignee: Xianyang Power Supply Branch Of Shaanxi Local Power Group Co Ltd
Current assignee: Xianyang Power Supply Branch Of Shaanxi Local Power Group Co Ltd
Priority date: 2019-06-26
Filing date: 2019-06-26
Publication date: 2020-01-21
Anticipated expiration: 2029-06-26

Abstract

An embedded 10kV line protection device comprises a device CT A phase module, a device CT C phase module, a device power module, a relay closing output control circuit module, a relay tripping output control circuit module and a device PT module which are connected with an FTU. The utility model retains the original three remote control, background communication, power supply and other functions of the FTU, thus achieving the purpose of not wasting assets and producing a novel protective FTU; the built-in protection device is additionally provided in a mode that a CT secondary terminal of the FTU is firstly short-circuited and then connected with a small device current wiring, so that the small protection device can be additionally provided under the condition that a 10kV line is not powered off.

Description

Embedded 10kV line protection device

Technical Field

The utility model relates to a line protection technical field, in particular to put into formula 10kV line protection device.

Background

The FTU protection devices which are commonly used by power supply enterprises at present and are provided with overcurrent protection cannot be effectively matched with each other and with a power transformation outlet switch protection device, and when a 10kV line has a short-circuit fault, the FTU protection devices provided with overcurrent protection have the problems of protection failure, misoperation and override tripping, so that the fault power failure range is expanded. In order to overcome the common problem of FTU protection devices equipped with overcurrent protection, some companies have developed "voltage-loss switching-off and power-on delay switching-on" type FTU protection devices (the disadvantages of the protection principle of the device do not belong to the important point of the discussion), but still have the following structural problems: the protection device is an independent FTU (fiber to the Unit), and the original FTU can be integrally replaced only by power failure of a 10kV line during installation and replacement; meanwhile, the functions of the original FTU, such as three remote control, communication, power supply and the like are correct, and due to the fact that a large number of FTUs with overcurrent protection are installed in the early stage of each power supply enterprise, the problem of asset waste can be caused when the FTUs are integrally replaced.

Disclosure of Invention

In order to overcome above-mentioned prior art not enough, the utility model aims to provide an insert formula 10kV circuit protection device, its protection principle is "overcurrent start, no stream and non-pressure trip, examine the coincidence of pressure, trip with higher speed after, with miniaturized insert formula protection device install additional in former FTU box, replace the former protect function of FTU with the device's protect function, keep the former three remote of FTU, backstage communication, functions such as power, reach the purpose that the asset is not wasted so promptly, produce the FTU of a novel protection in area again. The built-in protection device is additionally provided in a mode that a CT secondary terminal of the FTU is firstly short-circuited and then connected with a small device current wiring, so that the small protection device can be additionally provided under the condition that a 10kV line is not powered off.

In order to realize the purpose, the utility model discloses a technical scheme is:

an embedded 10kV line protection device comprises a device CT A phase module, a device CT C phase module, a device power module, a relay closing output control circuit module, a relay tripping output control circuit module and a device PT module which are connected with an FTU.

The input end of the CT A phase module of the device comprises an IA1 terminal and an IA2 terminal respectively, the IA1 terminal and a 1D:1 left terminal, IA2 wiring end and the inside former wiring PCB of FTU: 2, connecting (the PCB is required to be disassembled from the position 1D:1 before wiring: 2); the CT A phase module of the embedded protection device and the CT A phase module of the FTU sample the CT secondary A phase current of the 10kV line at the same time, and real-time A phase current is provided for the two protection devices.

The input end of the CT phase module of the device comprises an IC1 terminal and an IC2 terminal respectively, and the IC1 terminal is connected with a 1D:2 terminal, IC2 wiring end and inside former wiring PCB of FTU: 1 (before wiring, the PCB is disassembled from the position 1D: 2: 1); the CT C-phase module of the embedded protection device and the CT C-phase module of the FTU sample the secondary C-phase current of the CT of the 10kV circuit at the same time, and real-time C-phase current is provided for the two protection devices.

The input end of the power supply module of the device comprises a 24V + terminal and a 24V-terminal, the 3D terminal in the FTU is connected with the 24V + terminal and the 24V-terminal of the operation power supply module in the FTU, and the operation power supply module in the FTU provides 24V power supply for the built-in protection device.

The relay closing output control circuit module output end comprises a closing 1 wiring end and a closing 2 wiring end, the relay tripping output control circuit module output end comprises a tripping 1 wiring end and a tripping 2 wiring end, and the closing 1 wiring end, the closing 2 wiring end, the tripping 1 wiring end and the tripping 2 wiring end are respectively connected with a TCK terminal 20, a TCK terminal 21, a TCK terminal 18 and a TCK terminal 19 inside the FTU.

Device PT module input include 1 wiring end of PT secondary and 2 wiring ends of PT secondary, the FL of FTU lightning protection board is connected respectively to 1 wiring end of PT secondary and 2 wiring ends of PT secondary: 5 terminal and FL:6, a terminal; put into formula protection device's PT module and FTU power module input 10kV circuit PT secondary voltage simultaneously to make put into formula protection device and sample 10kV circuit PT secondary alternating voltage in real time, provide alternating current voltage source for FTU protection device simultaneously.

The utility model has the advantages that:

the utility model replaces the original protection function of FTU with the protection function of the device, and retains the original three remote control, background communication, power supply and other functions of FTU, thus achieving the purpose of not wasting assets and producing a novel protection FTU; the built-in protection device is additionally provided in a mode that a CT secondary terminal of the FTU is firstly short-circuited and then connected with a small device current wiring, so that the small protection device can be additionally provided under the condition that a 10kV line is not powered off.

Drawings

Fig. 1 is a schematic diagram of the circuit connection of the present invention.

Fig. 2 is an FTU interface circuit of the built-in protection device.

Fig. 3 is a wiring table for connecting the embedded protection device and the FTU.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

As shown in fig. 1: an embedded 10kV line protection device comprises a device CT A phase module, a device CT C phase module, a device power module, a relay closing output control circuit module, a relay tripping output control circuit module and a device PT module which are connected with an FTU.

The embedded protection device can be connected with FTU of the Colin manufacturer and FTU of most general manufacturers, and the device CT A phase module, the device CT C phase module, the device power supply module, the relay closing output control circuit module, the relay tripping output control circuit module and the device PT module in the embedded protection device are not changed)

The input end of the device CT a-phase module (the device CT a-phase module includes a device a-phase CT and an a-phase alternating current sampling circuit) includes an IA1 terminal and an IA2 terminal, respectively, the IA1 terminal and a 1D:1 left terminal, IA2 wiring end and the inside former wiring PCB of FTU: 2 are connected;

the CT A phase module of the embedded protection device and the CT A phase module of the FTU sample the CT secondary A phase current of the 10kV line at the same time, and real-time A phase current is provided for the two protection devices.

The device CT A-phase module comprises a device A-phase CT and a device A-phase AC current sampling circuit

The signal transmission scheme of the CT A phase when the embedded protection device is connected with FTUs of most common manufacturers is as follows: before wiring, when a 10kV line is powered off, firstly disconnecting a connecting wire from an IA terminal of an FTU to a CT A phase module of the FTU, then wiring, transmitting a 10kV line CT secondary A phase current to an IA1 terminal of an embedded protection device through the IA terminal of the FTU, then transmitting to an IA2 terminal through the CT A phase module of the device, then transmitting to the CT A phase module of the FTU through an original disconnecting wire of the FTU, and finally transmitting back to a current public N and returning to a 10kV line CT secondary current N, so that the CT A phase module of the embedded protection device and the CT A phase module of the FTU sample a 10kV line CT secondary A phase current at the same time, and real-time A phase current is provided for two protection devices.

The input end of the device CT C-phase module (the device CT C-phase module comprises a device C-phase CT and a C-phase alternating current sampling circuit) comprises an IC1 terminal and an IC2 terminal respectively, and the IC1 terminal is connected with a 1D terminal inside the FTU: 2 terminal, IC2 wiring end and inside former wiring PCB of FTU: 1 are connected;

the CT C phase module of the embedded protection device and the CT C phase module of the FTU sample the CT secondary C phase current of the 10kV line at the same time, and real-time C phase current is provided for the two protection devices.

The device CT C-phase module comprises a device C-phase CT and a C-phase alternating current sampling circuit.

The transmission scheme of the CT C phase signals when the embedded protection device is connected with FTUs of most common manufacturers is as follows: before wiring, when a 10kV line is powered off, firstly disconnecting a connecting wire from an IC terminal of an FTU to a CT C phase module of the FTU, then wiring, transmitting a 10kV line CT secondary C phase current to an IC1 wiring terminal of an embedded protection device through the IC terminal of the FTU, transmitting the 10kV line CT secondary C phase current to an IC2 wiring terminal through the CT C phase module of the embedded protection device, transmitting the 10kV line CT secondary C phase current to the CT C phase module of the FTU through an original disconnecting wire of the FTU, and finally transmitting the current to a current public N and returning to a 10kV line CT secondary current N.

The input end of the device power supply module (the device power supply module has the function of converting input 24V direct current voltage into direct current 5V and 3.3V voltage required by the device circuit) comprises a 24V + terminal and a 24V-terminal, the input end is connected with the 24V + terminal and the 24V-terminal of the operation power supply module in the FTU through the 3D terminal in the FTU, and the operation power supply module in the FTU provides 24V power supply for the built-in protection device.

24V power supply wiring scheme when embedded protection device is connected with FTU of most common manufacturers: the input end of the embedded protection device power module (the device power module is used for converting the input 24V direct current voltage into direct current 5V and 3.3V voltages required by the device circuit) comprises a 24V + terminal and a 24V-terminal which are respectively connected with the 24V + terminal and the 24V-terminal of the operation power module inside the FTU, and the operation power module inside the FTU provides 24V power for the embedded protection device.

Relay combined floodgate output control circuit module (relay combined floodgate output control circuit module includes CPU-P1.0, opto-coupler, combined floodgate relay coil and contact) output include that 1 wiring end of combined floodgate and 2 wiring ends of combined floodgate, relay tripping operation output control circuit module (relay tripping operation output control circuit module includes CPU-P1.1, opto-coupler, tripping relay coil and contact) output include that 1 wiring end of tripping operation and 2 wiring ends of tripping operation, the inside TCK terminal 20 of FTU, TCK terminal 21, TCK terminal 18 and TCK terminal 19 are connected respectively to 1 wiring end of combined floodgate, 2 wiring ends of combined floodgate, 1 wiring end of tripping operation and 2 wiring ends of tripping operation.

When the embedded protection device is connected with FTUs of most general manufacturers, the relay closing output control circuit module and the relay tripping output control circuit module output wiring scheme: the relay switching-on output control circuit module (the relay switching-on output control circuit module comprises a CPU-P1.0, an optical coupler, a switching-on relay coil and a contact) comprises a switching-on 1 terminal and a switching-on 2 terminal at the output end; the output end of the relay tripping output control circuit module (the relay tripping output control circuit module comprises a CPU-P1.1, an optical coupler, a tripping relay coil and a contact) comprises a tripping 1 wiring end and a tripping 2 wiring end. A switching-on terminal 1 of the relay switching-on output control circuit module and a tripping-out terminal 1 of the relay tripping-out output control circuit module are connected to a 24V + terminal of an FTU (fiber to the Unit) operating power supply; and a switch-on 2 wiring terminal of the relay switch-on output control circuit module is connected to the output end of the FTU switch-on circuit, and a trip 2 wiring terminal of the relay trip output control circuit module is connected to the output end of the FTU trip circuit.

Device PT module (device PT module includes device PT, alternating voltage sampling circuit) input include 1 wiring end of PT secondary and 2 wiring ends of PT secondary, the FL of FTU lightning protection board is connected respectively to 1 wiring end of PT secondary and 2 wiring ends of PT secondary: 5 terminal and FL:6, a terminal;

put into formula protection device's PT module and FTU power module input 10kV circuit PT secondary voltage simultaneously to make put into formula protection device and sample 10kV circuit PT secondary alternating voltage in real time, provide alternating current voltage source for FTU protection device simultaneously.

PT secondary wiring scheme when embedded protection device is connected with FTU of most general manufacturers: the input end of a PT module (the PT module of the device comprises a PT secondary 1 wiring end and a PT secondary 2 wiring end) of the device comprises a PT secondary 1 wiring end and a PT secondary 2 wiring end, and the PT secondary 1 wiring end and the PT secondary 2 wiring end are respectively connected with ACL and ACN of an alternating current input end of an FTU power supply module, so that the embedded protection device samples a PT secondary alternating voltage of a 10kV circuit in real time.

As shown in fig. 2 and fig. 3: the input end of the CT A phase module of the device comprises an IA1 terminal and an IA2 terminal respectively, the IA1 terminal and a 1D:1 left terminal, IA2 wiring end and the inside former wiring PCB of FTU: 2 (the PCB must be disassembled from 1D:1 before wiring: 2).

The input end of the CT phase module of the device comprises an IC1 terminal and an IC2 terminal respectively, and the IC1 terminal is connected with a 1D:2 terminal, IC2 wiring end and inside former wiring PCB of FTU: 1 (the PCB must be disassembled from 1D:2 before wiring: 1).

The input end of the power supply module of the device comprises a 24V + terminal and a 24V-terminal, and the input end of the power supply module of the device is connected with the 24V + terminal and the 24V-terminal of an operation power supply module in the FTU through a 3D terminal in the FTU.

Device PT module input include 1 wiring end of PT secondary and 2 wiring ends of PT secondary, the FL of FTU lightning protection board is connected respectively to 1 wiring end of PT secondary and 2 wiring ends of PT secondary: 5 terminal and FL:6 terminal.

24V + and 24V of the operation power supply module inside the FTU are measured by the 3D of the FTU: 1 terminal and 3D: the 10 terminals are connected to the 24V + and 24V-terminals of the power module of the built-in protective device so that the operating power module inside the FTU provides 24V power to the built-in protective device.

The secondary A-phase current of the CT of the 10kV line flows through the 1D of the FTU: the 1 terminal is transmitted to an IA1 terminal of the embedded protection device, then transmitted to an IA2 terminal through a CT A phase module, and then transmitted to an original connecting wire PCB inside an FTU: 2, the current is transmitted to a CT A phase module of the FTU, and finally transmitted back to a current public N and returned to a secondary current N of a CT of a 10kV line, so that the CTA phase module of the built-in protection device and the CT A phase module of the FTU simultaneously sample a secondary A phase current of the CT of the 10kV line, and real-time A phase currents are provided for the two protection devices; the secondary C-phase current of the CT of the 10kV line flows through the 1D of the FTU: the 2 terminal is transmitted to an IC1 terminal of the embedded protection device, then transmitted to an IC2 terminal through a CT C phase module, and then transmitted to an original connecting wire PCB inside the FTU: the current is transmitted to the CT C phase module of the FTU 1, and finally transmitted back to the current public N and returned to the secondary current N of the CT of the 10kV line, so that the CT C phase module of the embedded protection device and the CT C phase module of the FTU sample the secondary C phase current of the CT of the 10kV line at the same time, and real-time C phase current is provided for the two protection devices. In a word, the above process provides conditions for the built-in protection device to realize functions of overcurrent starting, no-current no-voltage tripping and post-acceleration tripping.

And the PT secondary 1 and the PT secondary 2 of the 10kV line are transmitted to the FL through the FTU lightning protection plate: 5. and the FL terminal is 6, and then is transmitted to the PT secondary 1 and PT secondary 2 terminals of a circuit of the PT module of the embedded protection device, and is simultaneously transmitted to the input end of the FTU power supply module. Therefore, the PT module and the FTU power supply module of the built-in protection device simultaneously input the PT secondary voltage of the 10kV line, so that the built-in protection device samples the PT secondary alternating voltage of the 10kV line in real time, and conditions are provided for realizing the functions of no voltage detection and pressure detection of the built-in protection device; and simultaneously provides an alternating voltage source for the FTU protection device.

The pressure coincidence detection signal of the built-in protection device is transmitted to a TCK terminal 20 and a TCK terminal 21 in an FTU (fiber to the Unit) through a closing terminal 1 and a closing terminal 2 of a relay closing output control circuit module, and then the 10kV switch is controlled to be closed through an FTU closing circuit, so that the pressure coincidence detection function of the built-in protection device is realized; the no-current no-voltage tripping signal or the post-acceleration tripping signal of the built-in protection device is transmitted to a TCK terminal 18 and a TCK terminal 19 in an FTU through a tripping 1 terminal and a tripping 2 terminal of a relay tripping output control circuit module, and then the tripping of a 10kV switch is controlled through an FTU tripping circuit, so that the function of 'no-current no-voltage tripping' or 'post-acceleration tripping' of the built-in protection device is realized.

The utility model discloses a preparation principle:

the embedded 10kV line protection device circuit has the advantages that firstly, except individual elements such as a CT (current transformer), a PT (potential transformer), a relay and the like, most of the elements adopt tiny patch elements; secondly, the circuits such as alternating current sampling, analysis processing, output control, power supply conversion, FTU interface and the like are designed and manufactured on a small circuit board, so that a small-volume protection device is manufactured. The embedded 10kV line protection device has been manufactured at present in the following external dimensions: 150mmX120mmX42mm, can be installed in all FTU boxes.

The principle of installing the embedded protection device is illustrated by taking the embedded protection device installed in the FTU (model: KE-7112) box as an example:

and (4) quitting original protection of the FTU, namely, under the conditions that the 10kV line is electrified and the FTU runs, quitting the original protection fixed value of the FTU by using a remote controller or a keyboard: overcurrent I section, overcurrent II section, overcurrent III section, reclosing, post-acceleration and zero sequence.

Installing a wiring:

1. and turning off the first and second alternating current voltages of the FTU, turning off the battery, and turning off a switch of the to-be-embedded protection device. And unscrewing the PT of the FTU and controlling the aerial plug. Note that: the 10kV line is in live operation, and the CT aerial plug can not be unscrewed.

2. The embedded protection device is placed at a proper position in the FTU and is fixed by a long binding wire, and a wiring terminal of the embedded protection device can not contact the shell.

3. And (3) short-circuiting 1D:1(IA) and 1D:6(IN) of the terminal at the right end of the FTU terminal row by using a secondary short-circuiting wire, and then short-circuiting 1D:2(IC) and 1D:6 (IN). Therefore, the CT secondary open circuit can not be caused when the wire is connected.

4. The 12 wires of the built-in protective device are connected to the relevant terminals of the FTU according to figures 1, 2 and 3. Note that: the embedded type protection devices 24V + and 24V-cannot be reversely connected; no shorting or casing of the drop-in protection device terminals and FTU terminal blocks can occur.

The application effect is as follows:

in 2018, in 4 months, 1 embedded protection device is respectively installed at the front ends of 11 rural power grid feeding circuits of a Y power supply division company.

1. 4 short-circuit faults occur in the year, and the protection is achieved: the power failure range is narrowed and fault points are searched quickly without refusing action, misoperation and override tripping.

2. Through measurement and calculation, each embedded protection device is installed in production and each FTU is replaced in production, the production replacement cost is saved by 2000 yuan, and the production installation (replacement) cost is saved by 22000 yuan if 11 embedded protection devices are installed in production and 11 FTUs are replaced in production.

3. The additional installation income formula protection device can go on under CT secondary short circuit, need not 10kV circuit power failure, installs 11 additional installation income formula protection devices then and reduces 11 times 10kV circuit power failures. 4500 degrees of electricity are reduced for each time averagely (if the average load of each 10kV line is 1500KW, FTU replacement needs 3 hours for each time), 49500 degrees of electricity are reduced for 11 times, and 24750 yuan is reduced for each degree of electricity according to 0.5 yuan.

4. The power supply of the Y power supply branch company is stopped for 11 times within 10kV rural power grid feed circuit years, and the reliability of power supply to the society is improved.

In a word, for the 10kV circuit to install income formula protection device additional, to power supply enterprise safe power consumption, reduce the transformation cost, supply more and reduce the loss, improve labor efficiency, improve all have important meaning to social power supply reliability.

The above experiments are all secret experiments.

Claims

1. The embedded 10kV line protection device is characterized by comprising a device CT A phase module, a device CT C phase module, a device power module, a relay closing output control circuit module, a relay tripping output control circuit module and a device PT module which are connected with an FTU respectively.

2. An embedded 10kV line protection device as claimed in claim 1, wherein the CT a phase module input terminals of the device comprise IA1 terminal and IA2 terminal, IA1 terminal and 1D:1 left terminal, IA2 wiring end and the inside former wiring PCB of FTU: 2 are connected;

3. The embedded 10kV line protection device of claim 1, wherein the input terminals of the CT C-phase module of the device respectively comprise an IC1 terminal and an IC2 terminal, and the IC1 terminal is connected to a 1D:2 terminal, IC2 wiring end and inside former wiring PCB of FTU: 1 are connected;

4. An embedded 10kV line protection device as claimed in claim 1, wherein the device power supply module input terminals comprise 24V + terminals and 24V-terminals, and are connected to the 24V + terminals and 24V-terminals of the operational power supply module inside the FTU through the 3D terminals inside the FTU, and the operational power supply module inside the FTU provides 24V power to the embedded protection device.

5. The embedded 10kV line protection device of claim 1, wherein the output end of the relay closing output control circuit module comprises a closing 1 terminal and a closing 2 terminal, the output end of the relay tripping output control circuit module comprises a tripping 1 terminal and a tripping 2 terminal, and the closing 1 terminal, the closing 2 terminal, the tripping 1 terminal and the tripping 2 terminal are respectively connected with a TCK terminal 20, a TCK terminal 21, a TCK terminal 18 and a TCK terminal 19 inside the FTU.

6. The embedded 10kV line protection device of claim 1, wherein the input terminals of the PT module of the device comprise a PT secondary 1 terminal and a PT secondary 2 terminal, and the PT secondary 1 terminal and the PT secondary 2 terminal are respectively connected to the FL of the FTU lightning protection plate: 5 terminal and FL:6, a terminal;