Method for protection of integrated switchgear cubicles from arcing fault. RU patent 2513032.
 Protection device against short circuits in dead zone of open distributing devices of electric power engineering sites of high or ultrahigh voltage - in sections between current transformers and switches / 2508585On a potential of high or ultrahigh voltage for each phase there are two transmitting modules installed on ends of the protected section and connected between themselves with a fibre-optic communication line. On the earth potential there is a retransmission module connected by means of radio channels to both transmitting modules and connected by means of a fibre-optic communication line to a combined control station. Each of the transmitting modules includes a power supply unit, a measuring converter, a modem, a comparison unit and a radio transmitter. The retransmission module is common for transmitting modules of all the phases of the protected section. |
 Electrical substation of electrophysical plant / 2491691Under voltage in the supply line 1 the voltage sensor 11 through a threshold element 12 and delay unit 15 closes shut-off valves 14 of helium turbine pump 6 included into cooling systems 13. |
 Method and device to disconnect power supply prior to cover opening / 2459334Method to disconnect power supply prior to cover opening consists in the following: (a) a bolt jacket is fixed to the bolt; (b) a motion sensor is connected to a protection and monitoring module by a wire or wireless method; and (c) the motion sensor is connected to send a command to permit power supply for functioning of electric equipment. When the jacket is removed, the motion sensor starts so that it sends a power cut command for electric equipment or starts an emergency alarm. |
 Cabinet of cubicle switchboard / 2454766Cabinet of cubicle switchboard (CCS) is done with the compartment of draw-out element, relay cabinet with safety and automation device located above the draw-out element compartment, collecting buses compartment, cable inlet compartment and excessive pressure discharge channels. Temperature control system of CCS detachable current buses is performed on the basis of contact optical sensor with "walk-off light mode". The sensor is in contact with current bus and its optical signals are continuously processed in CCS automation unit on-line. CCS is completely air-proof that prevents him from dust, moisture, insects and small animals' penetration. |
 Device for short-circuit protection in exposed switchgear deadband / 2446534Device ground potential comprises local and central modules for every phase of each protected section. Local module incorporates polarised light source fitted on one side of optical path, current differential protection unit and arc protection unit fitted on the opposite side of optical path, and command and lock signal generator. Input of the latter is connected to outputs of current differential protection unit and arc protection unit. Central module inputs are connected to local module outputs in all sections of deadband in exposed switchgear units, while its outputs are connected to disabling circuits of appropriate switches, interlocking of appropriate fast-response protection of appropriate adjacent components and starting of switch fault redundancy device. High- or superhigh-voltage potential is furnished with two Faraday elements connected at the beginning and end of protected section to allow turning of light unlike-sign polarisation planes in optical path, at one-way current. |
 Protective device having outer casing with double alarm / 2419939Protective device containing outer casing with double alarm includes housing and circuit board. Housing has one end provided with end part. End part contains through hole for insertion of lighting element. Circuit board is located inside the housing and includes two protection modules; one first warning alarm module and the second warning alarm module. The first and the second warning alarm modules are connected to lighting element. |
 Centralised backup protection device for hex-connected circuit / 2363084Invention is used in the area of electric engineering. Device contains the first, second, third, fourth, fifth, sixth units of current intensity control (CIC); the first, second, third, fourth, fifth, sixth relays latching "ON" position (ONR); the first, second, third, fourth, fifth, sixth relays latching "OFF" position (OFFR) of the first, second, third, fourth, fifth, sixth switch respectively; three slave relays of blocking units at remote protection devices of the first, second, third line for each phase of the first, second, third, fourth, fifth, sixth current-to-voltage transducers (CTV) made in the form of transductors; the first, second, third, fourth, fifth, sixth summation units; the first, second, third, fourth, fifth, sixth rectifiers; the first, second, third, fourth, fifth, sixth comparator units, unit preventing false tripping (FTP) common for three phases; logic units. |
 Device for busbar system protection against emergency electric arc / 2325748Said utility invention relates to a device for the emergency electric arc protection of a busbar system, which contains at least the first and second busbars with the first emergency electric arc electrode at least fixed to the first busbar and the second emergency electric arc electrode fixed to the second busbar; the first edge of the first emergency electric arc electrode being opposite the second edge of the second emergency electric arc electrode so that the electric arc occurring during a short circuit between the first and second conducting busbars burns between the first and second edges. On order to mainly avoid burning of the busbars, the inner width of the gap between the edges of the emergency electric arc electrode is less than the inner width of the gap between the busbars; the first and second emergency arc electrodes in the area of the first and second edges correspondingly are designed double-layered, in particular, by folding. |
 Arc protection pickup with enhanced noise immunity / 2294042The pickup provides for a high noise immunity of the system against outside actions, absence of power consumption in the expectation condition, convenience of assembly and operation. It is accomplished by the fact that a radiation photodiode is used as a photosensitive element, it has a spectral characteristic with a maximum in the ultraviolet range, operates with a maximum in the ultraviolet range, operates in the rectifier (generator) condition, without an external voltage source (at a zero power consumption of the pickup in the expectation condition). At an initiation of an arc the signal from the photodiode (electromotive force) is applied to a comparator controlling the PN junction in the gate condition (the "dry contact") type, coupled to the high-voltage equipment protective circuits. |
 Method and device for protection of switching equipment / 2269190Proposed method for protection of switching equipment and threaded contact joints of current-carrying parts includes checkup of switching equipment terminals for temperature deviation from normal value by installing temperature deviation checkup device in switching equipment terminal and tightening of switching equipment terminal made upon occurrence of odor field that points to inadmissible deviation of terminal temperature from normal. Device implementing this method has substrate-mounted temperature sensor incorporating air-tight spaces and at least one component made of material capable of transferring from solid to liquid phase in case of inadmissible temperature increase; novelty is that device has in addition thermoprobe mounted on other side of substrate and that temperature sensor is made in the form of container, air-tight spaces of temperature sensor being formed by partition made of material capable of transferring from solid to liquid phase in case inadmissible temperature increase and filled with materials responding to odorous gas. |
| Method and device for protection of switching equipment / 2269190 Proposed method for protection of switching equipment and threaded contact joints of current-carrying parts includes checkup of switching equipment terminals for temperature deviation from normal value by installing temperature deviation checkup device in switching equipment terminal and tightening of switching equipment terminal made upon occurrence of odor field that points to inadmissible deviation of terminal temperature from normal. Device implementing this method has substrate-mounted temperature sensor incorporating air-tight spaces and at least one component made of material capable of transferring from solid to liquid phase in case of inadmissible temperature increase; novelty is that device has in addition thermoprobe mounted on other side of substrate and that temperature sensor is made in the form of container, air-tight spaces of temperature sensor being formed by partition made of material capable of transferring from solid to liquid phase in case inadmissible temperature increase and filled with materials responding to odorous gas. |
| Arc protection pickup with enhanced noise immunity / 2294042 The pickup provides for a high noise immunity of the system against outside actions, absence of power consumption in the expectation condition, convenience of assembly and operation. It is accomplished by the fact that a radiation photodiode is used as a photosensitive element, it has a spectral characteristic with a maximum in the ultraviolet range, operates with a maximum in the ultraviolet range, operates in the rectifier (generator) condition, without an external voltage source (at a zero power consumption of the pickup in the expectation condition). At an initiation of an arc the signal from the photodiode (electromotive force) is applied to a comparator controlling the PN junction in the gate condition (the "dry contact") type, coupled to the high-voltage equipment protective circuits. |
| Device for busbar system protection against emergency electric arc / 2325748 Said utility invention relates to a device for the emergency electric arc protection of a busbar system, which contains at least the first and second busbars with the first emergency electric arc electrode at least fixed to the first busbar and the second emergency electric arc electrode fixed to the second busbar; the first edge of the first emergency electric arc electrode being opposite the second edge of the second emergency electric arc electrode so that the electric arc occurring during a short circuit between the first and second conducting busbars burns between the first and second edges. On order to mainly avoid burning of the busbars, the inner width of the gap between the edges of the emergency electric arc electrode is less than the inner width of the gap between the busbars; the first and second emergency arc electrodes in the area of the first and second edges correspondingly are designed double-layered, in particular, by folding. |
| Centralised backup protection device for hex-connected circuit / 2363084 Invention is used in the area of electric engineering. Device contains the first, second, third, fourth, fifth, sixth units of current intensity control (CIC); the first, second, third, fourth, fifth, sixth relays latching "ON" position (ONR); the first, second, third, fourth, fifth, sixth relays latching "OFF" position (OFFR) of the first, second, third, fourth, fifth, sixth switch respectively; three slave relays of blocking units at remote protection devices of the first, second, third line for each phase of the first, second, third, fourth, fifth, sixth current-to-voltage transducers (CTV) made in the form of transductors; the first, second, third, fourth, fifth, sixth summation units; the first, second, third, fourth, fifth, sixth rectifiers; the first, second, third, fourth, fifth, sixth comparator units, unit preventing false tripping (FTP) common for three phases; logic units. |
| Protective device having outer casing with double alarm / 2419939 Protective device containing outer casing with double alarm includes housing and circuit board. Housing has one end provided with end part. End part contains through hole for insertion of lighting element. Circuit board is located inside the housing and includes two protection modules; one first warning alarm module and the second warning alarm module. The first and the second warning alarm modules are connected to lighting element. |
| Device for short-circuit protection in exposed switchgear deadband / 2446534 Device ground potential comprises local and central modules for every phase of each protected section. Local module incorporates polarised light source fitted on one side of optical path, current differential protection unit and arc protection unit fitted on the opposite side of optical path, and command and lock signal generator. Input of the latter is connected to outputs of current differential protection unit and arc protection unit. Central module inputs are connected to local module outputs in all sections of deadband in exposed switchgear units, while its outputs are connected to disabling circuits of appropriate switches, interlocking of appropriate fast-response protection of appropriate adjacent components and starting of switch fault redundancy device. High- or superhigh-voltage potential is furnished with two Faraday elements connected at the beginning and end of protected section to allow turning of light unlike-sign polarisation planes in optical path, at one-way current. |
| Cabinet of cubicle switchboard / 2454766 Cabinet of cubicle switchboard (CCS) is done with the compartment of draw-out element, relay cabinet with safety and automation device located above the draw-out element compartment, collecting buses compartment, cable inlet compartment and excessive pressure discharge channels. Temperature control system of CCS detachable current buses is performed on the basis of contact optical sensor with "walk-off light mode". The sensor is in contact with current bus and its optical signals are continuously processed in CCS automation unit on-line. CCS is completely air-proof that prevents him from dust, moisture, insects and small animals' penetration. |
| Method and device to disconnect power supply prior to cover opening / 2459334 Method to disconnect power supply prior to cover opening consists in the following: (a) a bolt jacket is fixed to the bolt; (b) a motion sensor is connected to a protection and monitoring module by a wire or wireless method; and (c) the motion sensor is connected to send a command to permit power supply for functioning of electric equipment. When the jacket is removed, the motion sensor starts so that it sends a power cut command for electric equipment or starts an emergency alarm. |
| Electrical substation of electrophysical plant / 2491691 Under voltage in the supply line 1 the voltage sensor 11 through a threshold element 12 and delay unit 15 closes shut-off valves 14 of helium turbine pump 6 included into cooling systems 13. |
| Protection device against short circuits in dead zone of open distributing devices of electric power engineering sites of high or ultrahigh voltage - in sections between current transformers and switches / 2508585 On a potential of high or ultrahigh voltage for each phase there are two transmitting modules installed on ends of the protected section and connected between themselves with a fibre-optic communication line. On the earth potential there is a retransmission module connected by means of radio channels to both transmitting modules and connected by means of a fibre-optic communication line to a combined control station. Each of the transmitting modules includes a power supply unit, a measuring converter, a modem, a comparison unit and a radio transmitter. The retransmission module is common for transmitting modules of all the phases of the protected section. |
FIELD: electricity.
SUBSTANCE: invention relates to electric engineering, and namely to method for relay protection and may be used for protection of integrated switchgear cubicles from arcing fault. Technical result leads to reducing of damage in case of arcing fault in integrated switchgear cubicles. In this invention currents are measured in the cubicle cable phases comparing them to the first reference value. The cable switch is switched off with time delay when these current values in at least one phase are bigger than the first reference value. Zero-phase sequence currents are measured additionally close to the switch outputs and close to the sealing end from the cable side. The difference between them is calculated and compared with the second reference value and when the difference is bigger the cable switch is cut off without time delay.
EFFECT: reducing costs for recovery of integrated switchgear cubicles in result of decrease in their damage from arcing fault.
1 dwg
The invention relates to the power engineering, namely to the technique of relay protection, and can be used to protect the cells of complete switchgears (KRU) from arc fault.
There is a method of protection of KRU from arc fault, which measure the pressure in the cell at occurrence of arc, and if it exceeds a set value, then disconnect the power switch cable [Nagai VI Classification methods and analysis of information signs for identification of arc short circuits in electrical installations of Cabinet construction, Izv. universities. SEV.-KAV. the region. The technology. science. - 2001. - №2. - P.50-54].
The disadvantage of this method is low sensitivity due to scattering pressure in the sealing of KRU.
Closest to the proposed method of protection cells of complete switchgears (KRU) from arc fault is a method that allows to measure currents in phases cable cells, compare them with the first reference value, and after a time delay off switch cable, if these currents, at least in one of the phases, the first reference values [Andreev Century A. relay protection and automation of power supply systems): The high. SHK., 2008. - 639 S., Il.].
However, this method does not allow you to disable without time delay arc circuit, resulting in the cable between current transformers, built-in switch cable and transformer of a current of zero sequence established for funnel cable from the cable, not a switch. As a result of this happen considerable damage in cells KRU.
The technical result - reduction of destruction in arc short circuits in KRU.
The technical result is achieved that the way to protect the cells of complete switchgears (KRU) from arc closures, which measure the currents in phases cable cells, compare them with the first reference value, and after a time delay off switch cable, if these currents, at least in one of the phases, the first reference values, according to the claimed invention additional measure zero sequence currents near the conclusions of the switch and near cable funnel from the side of the cable, calculate the difference between them, compare it with the second reference value, and if this difference is more second reference values, then disconnect the power switch cable without time delay.
The method can be implemented using the devices presented on the figure 1.
The device contains a transformer 1, 2, 3 current transformer 4 current of zero sequence, block 5 comparison of current from the reference value, unit 6 the first reference values, block 7 delays, 8 transformer of a current of zero sequence, block 9 comparison of current from the reference value, unit 10 second reference values.
In the drawing a connection (cable) 11 connected to the phases a, b, C tire 12 using the switch 13 switchgear KRU, designated short circuits labeled 14-16. Transformers 1, 2, 3 connected to rusecko phases A, B and C respectively, transformer 4 current of zero sequence attached to the cable 11, unit 5 is connected to the secondary windings of transformers 1, 2, 3 and output unit 6 unit 7 is connected to the output of block 5, and the output - in circuit breaker circuit 13, 8 transformer connected near conclusions switch 13, unit 9 is connected to the outputs of transformers 4, 8 and output unit 10, and the output is connected to the circuit breaker circuit 13.
The device did not trigger false, the value of the second reference values is chosen with regard to the larger of the differences zero sequence currents in injuries outside the protected areas, for example in points 14 and 15.
The device works as follows. In normal operation the inputs block 9 enter the zero sequence currents with outputs transformers 4 and 8, as well as the value of the second reference values from the output knob 10. In block 9 of the zero sequence currents are balanced, subtracted, and the difference compared to the second reference value, and because of this difference does not exceed the value of the second reference values, the signal at the output of 9 does not appear, and the protection is disabled.
Short-circuit (SC) at the point 14 current of zero sequence on outputs transformers 4 and 8 increase. Increases and their difference in block 9 due to the difference in errors in the transformers 4 and 8, due to their design features. However, the output of block 9 signal does not appear, since the difference zero sequence currents, coming to its inputs, does not exceed the value of the second reference values. Protection is disabled. This is the trigger block 5, at the output of a signal and fed to the input of the block 7. The output of block 7 through exposure time of a signal, and switch 13 disabled.
With a short-circuit at point 15, in the presence of feeding from electric motors, due to the disproportionate increase in zero sequence currents on the outputs of transformers 4 and 8, increases their difference in block 9. But protection does not work, because this difference does not exceed the value of the second reference values. Also does the trigger block 5, as the value of the first reference values rebuilt against current supply from the electric motors.
With a short-circuit in point 16, between transformers 4 and 8, in the presence of feeding from the motor currents on their outputs increase disproportionately. But, as the short-circuit current from the system more power supply from the electric motors, the current output of the transformer 8 increases considerably more than the output current of the transformer 4. Equality currents in block 9 violated, their difference becomes greater than the value of the second reference values. The output of block 9 of a signal, and switch 13 off without time delay. In the absence of currents feeding from the electric motors in the cable wires current is absent or current flows intact phase, which is becoming isolated through the winding-fed power transformer, feeds place KZ. In the first case, the protection is triggered, since the output current of the transformer 8 is not compensated by the current of the transformer 4, and the reference value is compared directly with the current output of the transformer 8, which exceeds it. In the second case, the protection is triggered, since the short-circuit current from the system far exceeds the current in intact phase, and equality of currents in block 9 violated, and their difference increases and becomes more second reference values. And in the first and in the second cases the switch 13 off without time delay.
Economic impact : reduction of costs of KRU by reducing their damage at short circuits.
The way to protect cells switchgear from arc fault, which measure the currents in phases cable cells, compare them with the first reference value and through the time-off switch cable, if these currents, at least in one of the phases, the first reference values, wherein additional measure zero sequence currents near the conclusions of the switch and near cable funnel from the side of the cable, calculate the difference between them, compare it with the second reference value, and if this difference is more second reference values, then disconnect the power switch cable without time delay.