EP3593365B1 - An apparatus for detecting fire and preventing explosion of transformer and a method thereof - Google Patents

An apparatus for detecting fire and preventing explosion of transformer and a method thereof Download PDF

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Publication number
EP3593365B1
EP3593365B1 EP17818613.6A EP17818613A EP3593365B1 EP 3593365 B1 EP3593365 B1 EP 3593365B1 EP 17818613 A EP17818613 A EP 17818613A EP 3593365 B1 EP3593365 B1 EP 3593365B1
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EP
European Patent Office
Prior art keywords
transformer
pressure
input signal
oil
valve
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EP17818613.6A
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German (de)
English (en)
French (fr)
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EP3593365A1 (en
Inventor
V. K. Wakchaure
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Priority to HRP20212001TT priority Critical patent/HRP20212001T1/hr
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/40—Structural association with built-in electric component, e.g. fuse
    • H01F27/402—Association of measuring or protective means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/40—Structural association with built-in electric component, e.g. fuse
    • H01F27/402—Association of measuring or protective means
    • H01F2027/404—Protective devices specially adapted for fluid filled transformers

Definitions

  • the present disclosure relates to an apparatus and a system for detecting fire and preventing explosion in an electrical transformer system.
  • Embodiments of the present disclosure relates to an apparatus and a system for detecting fire, fluid leakage and preventing explosion in the electrical transformer.
  • transformer electrical transformers
  • transformer exhibits performance losses in windings and in core which are multifactorial.
  • Such losses in the transformer generate heat.
  • This heat can damage the insulation layer provided on the windings, causing insulation faults.
  • This insulation fault generates an electric arc, which trips a supply relay of the transformer (circuit breaker) by the action of an electrical protection system configured to safeguard the transformer.
  • the electric arc decomposes dielectric oil enclosed in an enclosure of the transformer, to release hydrogen, acetylene and other by-products within the enclosure.
  • the released gases rapidly increases the pressure inside the enclosure, which causes deflagration.
  • Deflagration results in extensive tearing of the mechanical connections (bolts, welds and other mechanical joints) within the enclosure of the transformer. Tearing of mechanical connections brings the released gases in contact with the oxygen present in the surrounding air. Acetylene being inflammable in presence of oxygen, immediately ignites, causing the transformer to burn. This fire in the transformer can spread to other on-site equipment, causing extensive damage. The fire may also trigger explosion of the transformer. Typically, explosion of the transformer occurs due to short-circuit caused by overloads, voltage surges, progressive deterioration of the insulation, insufficient oil level and failure of an insulating component. However, uncontrolled fire can also be a trigger for transformer explosion.
  • fire protection systems are configured in the transformers, as shown for example in US 7 869 167 B2 . These fire protection systems are actuated by combustion of dielectric oil or by fire detectors. However, these systems operate with a significant time lag. Thus, it is necessary to limit the combustion of the equipment, and to prevent the fire from spreading to neighbouring plants or surrounding equipment's.
  • the decomposition of the dielectric oil is to be controlled. This is achieved by use of silicone oils instead of conventional mineral oils within the enclosure of the transformer.
  • these precautions reduce the pressure built-up in the enclosure, due to decomposition of the silicone oil by few milliseconds. This time interval is not feasible for engaging any precautionary means for preventing explosion of the transformer.
  • Prior method includes steps of detecting a break in the insulation of the transformer using a pressure sensor. Subsequently, the coolant contained in enclosure of the transformer is depressurised, using a valve. A pressurized inert gas is injected into the bottom of the enclosure, to stir the coolant and prevent the oxygen from entering the enclosure. The injection of pressurised inert gas into the enclosure cools the hot parts of the transformer.
  • an apparatus for detecting fire and preventing explosion in a transformer comprises at least one voltage variation detection unit for determining ratio of an input voltage entering the transformer and an output voltage exiting the transformer.
  • the at least one voltage variation detection unit provides a first input signal to at least one control unit, when ratio of the input voltage and the output voltage surpasses a preset threshold ratio.
  • An over current detection unit for monitoring load on the transformer is provisioned in the apparatus.
  • the over current detection unit provides a second input signal to at least one control unit when load on the transformer surpasses a preset load threshold.
  • at least one surge detection unit and at least one Rapid Pressure Rise Relay are configured in the apparatus, to detect oil surge and variation of oil pressure respectively within a transformer tank.
  • a third input signal is provided to the at least one control unit, when the oil surge and the variation of oil pressure in the transformer tank surpasses a preset pressure threshold.
  • one or more circuit breakers is configured, for receiving input signals from either one of the at least one voltage variation detection unit, the over current detection unit, the at least one surge detection unit and the at least one rapid pressure rise relay.
  • the one or more circuit breakers provides a fourth input signal to the at least one control unit, upon receipt of input signals.
  • the at least one control unit receives either one of the first input signal, the second input signal, the third input signal and the fourth input signal, thereby generating a control signal for operating a drain valve and a gas release valve.
  • the gas release valve comprises a primary gas valve and a secondary gas valve.
  • the primary gas valve is configured with a primary inlet port fluidly connected to a gas source and a primary outlet port.
  • the secondary gas valve is configured with a secondary inlet port, fluidly connected to the primary outlet port and a secondary outlet port fluidly connected to the transformer tank for routing gas into the transformer tank when the primary gas valve and the secondary gas valve are actuated.
  • An exhaust port is configured to the secondary gas valve, to exhaust the gas leaked from either one of the primary gas valve and secondary gas valve to the atmosphere, when the primary gas valve and the secondary gas valve are in closed position.
  • the at least one voltage variation detection unit provides first input signal to control unit, when the ratio of the input voltage and the output voltage surpasses 1:40 threshold ratio.
  • the one or more circuit breakers cuts-off the transformer from receiving the input voltage when ratio of the input voltage and the output voltage surpasses the preset threshold ratio.
  • the at least one control unit operates the drain valve for draining oil from the transformer tank.
  • the at least one control unit operates the gas release valve to inject gas from a gas source to bottom of the transformer tank, for stirring the oil in order to reduce temperature and oxygen content in the transformer tank, thereby preventing explosion and fire within the transformer.
  • the secondary outlet port of the secondary gas valve is connected to the transformer tank through a gas flow control valve and a non-return valve.
  • the gas source is connected to the primary inlet port of the primary gas valve through a pressure regulator to control pressure of the gas entering the primary gas valve.
  • an apparatus for detecting fire and preventing explosion in a transformer comprises at least one Pressure monitoring Switch configured to detect pressure of oil routed through a drain pipe.
  • the at least one pressure monitoring switch provides a first input signal to at least one control unit, when the pressure of oil routed through the drain pipe surpasses a preset value.
  • the at least one pressure monitoring switch [PMS] further comprises at least one pressure switch for generating the first signal, when oil pressure in a pressure port of the pressure monitoring switch surpasses a preset value.
  • At least one spring loaded plunger is provisioned in the PMS, which in contact with the pressure switch for operating the pressure switch.
  • At least one diaphragm is attached to the spring loaded plunger for operating the at least one spring loaded plunger, based on the pressure of oil in the pressure port and entering the at least one diaphragm.
  • the pressure port is connected to drain pipe for receiving predetermined amount of oil, thereby maintaining pressure of oil routed through the drain pipe.
  • the apparatus comprises at least one voltage variation detection unit for determining ratio of an input voltage entering the transformer and an output voltage exiting the transformer.
  • the at least one voltage variation detection unit provides a second input signal to at least one control unit, when ratio of the input voltage and the output voltage surpasses a preset threshold ratio.
  • An over current detection unit for monitoring load on the transformer is provisioned in the apparatus.
  • the over current detection unit provides a third input signal to the at least one control unit when load on the transformer surpasses a preset load threshold.
  • at least one surge detection unit and at least one Rapid Pressure Rise Relay are configured in the apparatus, to detect oil surge and variation of oil pressure within a transformer tank.
  • a fourth input signal is provided to the at least one control unit, when the oil surge and the variation of oil pressure in the transformer tank surpasses a preset pressure threshold.
  • one or more circuit breakers is configured in the apparatus, for receiving input signals from either one of the at least one voltage variation detection unit, the over current detection unit, the at least one surge detection unit and the at least one rapid pressure rise relay. The one or more circuit breakers provides a fifth input signal to the at least one control unit, upon receipt of input signals.
  • the at least one control unit receives either one of the first input signal, the second input signal, the third input signal, the fourth input signal and the fifth input signal, thereby generating a control signal for operating a drain valve and a gas release valve.
  • the gas release valve comprises a primary gas valve and a secondary gas valve.
  • the primary gas valve is configured with a primary inlet port fluidly connected to a gas source and a primary outlet port.
  • the secondary gas valve is configured with a secondary inlet port, fluidly connected to the primary outlet port and a secondary outlet port fluidly connected to the transformer tank for routing gas into the transformer tank when the primary gas valve and the secondary gas valve are operated by the at least one control unit.
  • An exhaust port is configured to the secondary gas valve, to exhaust the gas leaked from either one of the primary gas valve and secondary gas valve to the atmosphere, when the primary gas valve and the secondary gas valve are in closed position.
  • the pressure port is connected to at least one three-way ball valve to receive oil bypassed from the drain pipe.
  • At least one three-way ball valve is connected to at least one two-way ball valve through a first hose pipe for receiving oil bypassed from the drain pipe.
  • the at least one three-way ball valve is connected to the drain pipe by a second hose pipe for routing the oil bypassed back to the drain pipe.
  • a gasket is provided between the pressure port and the diaphragm for preventing oil leakage.
  • a plurality of support plates is provisioned to the at least one pressure monitoring switch for housing the at least one diaphragm.
  • a system for detecting fire, detecting fluid leakage through a drain valve disposed in a drain pipe and preventing fire in a transformer comprises a fluid leakage detection unit for detecting fluid leakage in the drain pipe.
  • the fluid leakage detection unit comprises a fluid collection compartment fluidly connected to downstream of the drain pipe for collecting fluid leaked through the drain valve in a closed position.
  • the fluid collection compartment comprises at least one through hole provided on a top and a bottom side of the fluid collection compartment. The area surrounding the at least one through hole of the bottom side of the fluid collection compartment is configured as a fluid collection area to collect the leaked fluid.
  • the bottom side of the fluid collection compartment is connected with a fluid discharge pipe that extends up to a predetermined height into the fluid collection compartment via the at least one through hole.
  • at least one fluid level switch is positioned at a predetermined location inside the fluid collection compartment to trigger an alarm upon collection of predetermined amount of fluid in the fluid collection area to indicate fluid leakage.
  • the apparatus further comprises at least one pressure monitoring switch configured to detect pressure of oil routed through the drain pipe, thereby providing a first input signal to at least one control unit, when the pressure of oil routed through the drain pipe surpasses a preset value.
  • the at least one pressure monitoring switch [PMS] further comprises at least one pressure switch for generating the first signal, when oil pressure in a pressure port of the at least pressure monitoring switch surpasses a preset value.
  • At least one spring loaded plunger is provisioned in the at least one pressure monitoring switch, which in contact with the pressure switch for operating the pressure switch. At least one diaphragm is attached to the at least one spring loaded plunger for operating the at least one spring loaded plunger, based on the pressure of oil in the pressure port and entering the at least one diaphragm. Also, the pressure port is connected to the drain pipe for receiving predetermined amount of oil, thereby maintaining pressure of oil routed through the drain pipe. Further, the apparatus comprises at least one voltage variation detection unit for determining ratio of an input voltage entering the transformer and an output voltage exiting the transformer. The at least one voltage variation detection unit provides a second input signal to at least one control unit, when ratio of the input voltage and the output voltage surpasses a preset threshold ratio.
  • An over current detection unit for monitoring load on the transformer is provisioned in the apparatus.
  • the over current detection unit provides a third input signal to at least one control unit when load on the transformer surpasses a preset load threshold.
  • at least one surge detection unit and at least one Rapid Pressure Rise Relay are configured in the apparatus, to detect oil surge and variation of oil pressure within a transformer tank.
  • a fourth input signal is provided to the at least one control unit, when the oil surge and the variation of oil pressure in the transformer tank surpasses a preset pressure threshold.
  • one or more circuit breakers is configured in the apparatus, for receiving input signals from either one of the at least one voltage variation detection unit, the over current detection unit, the at least one surge detection unit and the at least one rapid pressure rise relay.
  • the one or more circuit breakers provides a fifth input signal to the at least one control unit, upon receipt of input signals.
  • the at least one control unit receives either one of the first input signal, the second input signal, the third input signal, the fourth input signal and the fifth input signal, thereby generating a control signal for operating a drain valve and a gas release valve.
  • the gas release valve comprises a primary gas valve and a secondary gas valve.
  • the primary gas valve is configured with a primary inlet port fluidly connected to a gas source and a primary outlet port.
  • the secondary gas valve is configured with a secondary inlet port, fluidly connected to the primary outlet port and a secondary outlet port fluidly connected to the transformer tank for routing gas into the transformer tank when the primary gas valve and the secondary gas valve are operated by the at least one control unit.
  • An exhaust port is configured to the secondary gas valve, to exhaust the gas leaked from either one of the primary gas valve and secondary gas valve to the atmosphere, when the primary gas valve and the secondary gas valve are in closed position.
  • a method for detecting fire, detecting fluid leakage through a drain valve disposed in a drain pipe and preventing explosion of a transformer comprising acts of monitoring fluid level in a fluid collection compartment, wherein at least one fluid level switch positioned at a predetermined location inside the fluid collection compartment is configured to trigger an alarm upon detecting a predetermined level of fluid in a fluid collection area of the fluid collection compartment to indicate fluid leakage.
  • the pressure of oil in a transformer tank routed through the drain pipe is monitored by at least one pressure monitoring switch, thereby providing a first input signal to the at least one control unit, when the oil pressure of oil routed through the drain pipe surpasses a preset value.
  • ratio between input voltage and output voltage is calculated, and provides a second input signal to at least one control unit when ratio of the input voltage and the output voltage surpasses a preset threshold ratio.
  • a third input signal is provided to the at least one control unit when load on the transformer surpasses a preset load threshold. Excessive oil surge and rate of change of oil pressure in a transformer tank of the transformer is monitored by at least one surge detection unit and a Rapid Pressure Rise Relay [RPRR] respectively and thereby providing a fourth input signal to the at least one control unit.
  • RPRR Rapid Pressure Rise Relay
  • a fifth input signal is provided to at least one control unit by one or more circuit breakers when the one or more circuit breaker receives either one of the first input signal, the second input signal, the third input signal and the fourth input signal.
  • the at least one control unit generates a control signal, when either one of the first input signal, the second input signal, the third input signal, the fourth input signal and the fifth input signal is received by the at least one control unit.
  • the control signal operates a drain valve and a gas release valve, thereby detecting fire and preventing explosion of the transformer.
  • an apparatus for detecting fire and preventing explosion in a transformer comprises at least one voltage variation detection unit for determining ratio of an input voltage entering the transformer and an output voltage exiting the transformer.
  • the at least one voltage variation detection unit detects the ratio of input voltage to output voltage with a preset threshold ratio.
  • the at least one voltage variation detection unit is configured to provide a first input signal to at least one control unit, when the ratio of the input voltage and the output voltage surpasses a preset threshold ratio.
  • the at least one voltage variation detection unit provides the first input signal when the ratio of input voltage and the output voltage surpasses 1:40 threshold ratio.
  • An over current detection unit is provisioned to the apparatus to monitor the load on the transformer.
  • the over current detection unit may be an over current relay.
  • the over current detection unit compares the difference value of current entering the transformer to the current exiting the transformer. If the difference value is greater than the preset load threshold, a second input signal is provided to the at least one control unit.
  • At least one surge detection unit and at least one rapid pressure rise relay [RRRR] is provisioned in the apparatus to detect oil surge and variation of oil pressure within a transformer tank of the transformer.
  • the at least one surge detection unit is triggered, when the oil surge surpasses a preset pressure threshold.
  • the at least one rapid pressure rise relay is triggered, when the variation of oil pressure in the transformer tank surpasses a preset pressure threshold.
  • the at least one surge detection unit and the at least one rapid pressure rise delay, when simultaneously triggered provide a third input signal to the at least one control unit.
  • one or more circuit breakers are provided in the apparatus and configured to receive input signals from either one of the at least one voltage variation detection unit, the over current detection unit, the at least one surge detection unit and the at least one rapid pressure rise delay. Upon receipt of input signal from either of the components, the one or more circuit breakers provides a fourth input signal to the at least one control unit.
  • the at least one control unit Upon receipt of either of the first input signal, the second input signal, the third input signal and the fourth input signal the at least one control unit is configured to generate a control signal to operate a drain valve and a gas release valve simultaneously.
  • the drain valve is configured to drain oil from the transformer tank upon receipt of control signal from the at least one control unit.
  • the gas release valve connected to a gas source is operated by the at least one control unit to release gas from the bottom portion of the transformer tank. Supply of gas from bottom of the transformer tank reduces the temperature of oil and thereby, preventing fire and explosion of the transformer.
  • the apparatus further includes a pressure monitoring switch configured on a drain pipe of the transformer.
  • the pressure monitoring switch is configured to monitor pressure of the oil, draining from the drain pipe of the transformer.
  • the pressure monitoring switch includes at least one pressure switch, which produces an input signal to the at least one control unit, when the pressure of oil draining from the transformer tank surpasses the preset value.
  • the preset value of pressure is 7 mwc [meter water column].
  • the at least one pressure switch is in contact with at least one spring loaded plunger for operating the at least one pressure switch.
  • the at least one spring loaded plunger in-turn is interfaced to at least one diaphragm.
  • the at least one diaphragm receives oil from the transformer tank and based on the pressure of oil, the at least one diaphragm inflates which in-turn operates the at least one spring loaded plunger.
  • the at least one spring loaded plunger further operates the at least one pressure switch to provide input signal to the at least one control unit.
  • the pressure monitoring switch therefore provides the first input signal to the at least one control unit, when the pressure of oil draining from the drain pipe surpasses a preset value.
  • the at least one voltage variation detection unit over current detection unit, at least one surge detection unit and one or more circuit breakers provides the second input signal, the third input signal, the fourth input signal and a fifth input signal respectively to the at least one control unit, when the pressure monitoring switch provides the first input signal to the at least one control unit.
  • a system for detecting fire, detecting fluid leakage through the drain valve and preventing fire in a transformer includes the apparatus as described above to detect fire and prevent explosion of the transformer, along with a fluid leakage detection unit.
  • the fluid leakage detection unit is configured to detect leakage of fluid in a fluid discharge pipe, which routes the oil from the transformer tank.
  • the fluid leakage detection unit comprises a fluid collection compartment which is fluidly connected to downstream of the drain pipe.
  • the fluid collection compartment is configured to collect fluid leaked through the drain valve, when the drain valve is in closed position.
  • the fluid collection compartment further comprises at least one through hole at top and bottom sides.
  • a fluid discharge pipe is mounted so as to extend into the fluid collection compartment up to a predetermined height. This configuration enables, the area surrounding the at least one through hole to act as a fluid collection area for collecting the fluid leaked from the drain valve.
  • At least one fluid level switch is provided in the fluid collection compartment at a predetermined location. The at least one fluid level switch is configured to trigger an alarm upon collection of a predetermined amount of fluid in the fluid collection area.
  • Figure 1 illustrates an exemplary embodiment of the apparatus (100) for detection of fire and preventing explosion of a transformer (30).
  • the apparatus (100) is configured to generate a control signal to operate a gas release valve (6) for releasing a gas from a gas source (7) into a transformer tank (14) of the transformer (30), when there is a detection of fire in the transformer (30).
  • the apparatus (100) comprises, the transformer (30), having a transformer tank (14) on which a high voltage conductor (22) and a low voltage conductor (23) is provided.
  • the high voltage conductor (22) and low voltage conductor (23) are configured to conduct current and voltage in and out of the transformer (30) for step-up or step down operation.
  • the high-voltage conductor (22) carries input current and low-voltage conductor (23) carries output current.
  • the high voltage conductor (22) and low voltage conductor (23) are connected to a high and low voltage transformer bushings (15 and 16) [hereinafter also referred to as transformer bushings] respectively.
  • the transformer bushings (15 and 16) are insulated devices, which allow voltage and/or current to conduct through the wall of the transformer (30).
  • the transformer tank (14) is filled with oil (11).
  • the oil (11) in the transformer tank (14) acts as a coolant for dissipating heat generated during working cycle of the transformer (30).
  • the oil (11) is selected having properties such as but not limiting to dielectric/electric insulating property, high thermal capacity and low viscosity properties.
  • the oil (11) is preferably a dielectric combustible coolant fluid.
  • the transformer (30) is connected to a transformer conservator (21), which is in fluid communication with the transformer tank (14) through a pipe or conduit (19).
  • the transformer conservator (21) acts as a surge tank, to neutralize variation of oil pressure in the transformer tank (14).
  • the pipe or conduit (19) is provided with an Electrical Transformer conserveator Isolation Valve [ETCIV] (20) [herein referred to as ETCIV].
  • ETCIV Electrical Transformer conserveator Isolation Valve
  • the ETCIV (20) is configured to block the passage in the pipe or conduit (19), upon detecting rapid movement of oil (11) from the transformer conservator (21) to the transformer tank (14). This inherently denotes that there is an abrupt pressure increase or pressure decrease of oil (11) within the transformer tank (14).
  • a signal box (10) interfaces the control unit (1) and the ETCI valve (20), to enable operating the ETCI valve (20) by the control unit (1).
  • a differential current and voltage sensing relay (26) is provided in the apparatus (100) for measuring differential current and voltage between incoming high voltage conductor (22) and outgoing low voltage conductor (23).
  • the differential current and voltage sensing relay (26) includes at least one voltage variation detection unit (26a) [hereinafter referred to as voltage variation detection unit] and an over current detection unit (26b) to monitor the voltage and current of the transformer (30), respectively.
  • the differential current and voltage sensing relay (26), the voltage variation detection unit (26a) and the over current detection unit (26b) are interfaced with at least one control unit (1) [hereinafter referred to as control unit] of the transformer (30).
  • the voltage variation detection unit (26a) is configured to determine ratio of an input voltage entering, and an output voltage exiting the transformer (30).
  • the ratio determined by the voltage variation detection unit (26a) is compared with a preset threshold ratio.
  • the preset ratio value is stored in the control unit (1) of the transformer (30). In an embodiment, the preset value of the ratio is 1:40 for a step-up transformer.
  • the voltage variation detection unit (26a) is configured to provide a first input signal to the control unit (1), when the ratio of the input voltage and the output voltage surpasses a preset threshold ratio.
  • the over current detection unit (26b) is configured to monitor load on the transformer (30). In an embodiment, the load is determined by calculating difference in the input current and the output current of the transformer (30). In another embodiment, the load is determined by calculating ratio of the input current to the output current of the transformer (30). The load on the transformer (30) calculated by the over current detection unit (26b), is compared with a preset value. The preset load value is stored in the control unit (1). In an embodiment, the preset value for load on the transformer (30) is selected as per requirement. The over current detection unit (26b) is configured to provide a second input signal to the control unit (1), when the load on the transformer (30) surpasses the preset load threshold.
  • the voltage variation detection unit (26a) and the over current detection unit (26b) are preferably electrical relays.
  • the differential current and voltage sensing relay (26) monitors incoming and outgoing signals [voltage and current] of the transformer (30), to provide the first input signal and the second current signal to the control unit (1).
  • the first input signal is provided to the control unit (1), when the voltage variation surpasses the preset threshold ratio.
  • the second input signal is provided to the control unit (1), when the load variation surpasses the preset load threshold.
  • the differential current and voltage sensing relay (26) trips or cuts the connection between the input terminals or output terminals of the transformer (30), when the voltage or current variation surpasses the preset limit.
  • the apparatus (100) further comprises at least one surge detection unit (18) [hereinafter referred to as surge detection unit] and at least one rapid pressure rise relay (RPRR) [hereinafter referred to as rapid pressure rise relay].
  • the surge detection unit (18) is assembled in the pipe or conduit (19), for sensing oil surge in the transformer tank (14). The oil surge is sensed by monitoring oil level from the transformer tank (14) towards the transformer conservator (21).
  • the surge detection unit (18) is a Buchholz relay.
  • the rapid pressure rise relay (RPRR) [not shown in figures] detects the variation of oil pressure within the transformer tank (14) based on the oil surge occurring in the transformer tank (14). The oil surge and the variation of oil pressure are compared with a preset value stored in the control unit (1).
  • the surge detection unit (18) and the rapid pressure rise relay [RPRR] collectively provide a third input signal to the control unit (1), when the oil surge and the variation of oil pressure surpasses the preset pressure threshold.
  • a fire detector (17) is configured on the transformer tank (14) to detect burning of the transformer (30).
  • the surge detection unit (18) trips or cuts the connection between the input terminals or output terminals of the transformer (30), when the oil surge surpasses the preset surge threshold.
  • the apparatus (100) also includes one or more circuit breakers (24, 28), which are interfaced with the voltage variation detection unit (26a), the over current detection unit (26b), the surge detection unit (18) and the rapid pressure rise relay [RPRR].
  • the one or more circuit breakers (24, 28) receives input signals from either of the voltage variation detection unit (26a), the over current detection unit (26b), the surge detection unit (18) and the rapid pressure rise relay [RPRR].
  • the one or more circuit breakers (24, 28) are configured to provide a fourth input signal to the control unit (1), upon receipt of input signal from either of the voltage variation detection unit (26a), the over current detection unit (26b), the surge detection unit (18) and the rapid pressure rise relay [RPRR].
  • the one or more circuit breakers (24, 28) trips or cuts the connection between the input terminals or output terminals of the transformer (30), upon receipt of input signals from either of the voltage variation detection unit (26a), the over current detection unit (26b) the surge detection unit (18) and the rapid pressure rise relay [RPRR].
  • the one or more circuit breakers (24, 28) receives input signal from the voltage variation detection unit (26a), when the voltage variation in the transformer (30) surpasses the preset threshold ratio. Upon receipt of the input signal from the voltage variation detection unit (26a), the one or more circuit breakers (24, 28) provide the fourth input signal to the control unit (1).
  • the one or more circuit breakers (24, 28) receives input signal from the over current detection unit (26b), when the load variation in the transformer (30) surpasses the preset load threshold. Upon receipt of the input signal from the over current detection unit (26b), the one or more circuit breakers (24, 28) provides the fourth input signal to the control unit (1).
  • the one or more circuit breakers (24, 28) receives input signal from the surge detection unit (18), when the oil surge in the transformer tank (14) surpasses the preset surge limit. Upon receipt of the input signal from the surge detection unit (18), the one or more circuit breakers (24, 28) provide the fourth input signal to the control unit (1).
  • the one or more circuit breakers (24, 28) receives input signal from the rapid pressure rise relay [RPRR], when the oil pressure variation in the transformer tank (14) surpasses the preset limit. Upon receipt of the input signal from the rapid pressure rise relay [RPRR], the one or more circuit breakers (24, 28) provides the fourth input signal to the control unit (1).
  • RPRR rapid pressure rise relay
  • the one or more circuit breakers (24, 28) receives input signals from combinations of the voltage variation detection unit (26a), the over current detection unit (26b), the surge detection unit (18) and the rapid pressure rise relay [RPRR]. Upon receipt of the input signals, the one or more circuit breakers (24, 28) provide the fourth input signal to the control unit (1).
  • the one or more circuit breakers (24, 28) provides the fourth input signal to the control unit (1), upon receipt of either of the first input signal, the second input signal and the third input signal from the voltage variation detection unit (26a), the over current detection unit (26b), the surge detection unit (18) and the rapid pressure rise relay [RPRR] respectively, either alone or in combination.
  • the apparatus (100) also includes a drain pipe (9) with one end connected to the transformer tank (14) and the other end connected to an oil sump (8).
  • the drain pipe (9) is configured to route the oil drained out from the transformer tank (14) to the oil sump (8).
  • the drain pipe (9) is connectable in any position, which enables the drain pipe (9) to route oil (11) from the transformer tank (14).
  • the drain pipe (9) is connected on top portion of the transformer tank (14).
  • a pump [not shown in figures] is configured with the drain pipe (9) to enable draining of the oil (11) stored in the transformer tank (14).
  • a drain valve (4) is configured to the drain pipe (9).
  • the drain valve (4) allows routing of the oil (11).
  • the drain valve (4) operates based on a control signal received from the control unit (1).
  • the drain valve (4) is selected from a group such as but not limiting to ball valves, butterfly valves and solenoid valves.
  • the drain valve (4) is a solenoid valve.
  • the drain valve (4) includes a lifting magnet (5) which upon receipt of the control signal is displaced from its rest position [not shown in figures]. Displacing the lifting magnet from rest position, will unblock the passage in the drain pipe (9), thereby allowing oil (11) to flow from the transformer tank (14) to the oil sump (8).
  • the transformer tank (14) is placed on a ground level (12) with wheels of the transformer (13) in contact with the ground level (12).
  • the apparatus (100) includes a conduit (45), with one end fluidly connected to a gas source (7) provisioned in a fire extinguishing compartment of the apparatus (100), and the other end connected to the transformer tank (14).
  • the conduit (45) is configured to route a gas, from the gas source (7) to the transformer tank (14).
  • the conduit (45) is provisioned such that it will enable the gas routed to the transformer tank (14) to swirl contents within the transformer tank (14).
  • the conduit (45) and the drain pipe (9) are spaced apart by a predetermined head or height, so that the gas entering the transformer tank (14) will not instantaneously exit out of the transformer tank (14).
  • conduit (45) and the drain pipe (9) are provisioned on opposite portions of the transformer tank (14) i.e. bottom and top portion respectively.
  • This exemplary configuration of conduit (45) and the drain pipe (9) enables to drain oil (11) from the transformer tank (14) and also simultaneously allow filling of gas.
  • the gas is selected such that it comprises properties such as but not limiting to inertness/dielectricity and high thermal capacity properties.
  • the gas is nitrogen.
  • the gas routed to the transformer tank (14) reduces temperature of the oil (11) and also reduces the oxygen content in the transformer tank (14), thereby preventing explosion of the transformer (30).
  • the gas also, blocks any damage or rupture occurred to the transformer tank (14) due to heating, by forming a layer or an envelope of gas in the ruptured or damaged region.
  • a gas release valve (6) is provisioned in the conduit (45), to route gas from the gas source (7) to the transformer tank (14) upon receiving control signal from the control unit (1).
  • the gas release valve (6) comprises a primary gas valve (6a) and a secondary gas valve (6b) connected in series.
  • the primary gas valve (6a) includes an inlet port (6d) connected to the gas source (7) and an outlet port (6e) connected to an inlet port (6f) of the secondary valve (6b).
  • Outlet port (6g) of the secondary gas valve (6b) is connected to the transformer tank (14).
  • the primary gas valve (6a) holds the gas and prevents it to reach the inlet port (6f) of the secondary gas valve (6b), when the primary gas valve (6b) is in closed condition.
  • the primary gas valve (6a) is opened, the gas is supplied to secondary gas valve (6b). If the secondary valve is also opened, the gas is routed to the transformer tank (14).
  • both the primary and secondary gas valves (6a, 6b) operate simultaneously with common operating device in gas releasing unit (6).
  • the primary and secondary gas valves (6a, 6b) are selected from group such as but not limiting to ball valves and spring loaded valves.
  • the primary gas valve (6a) consists of at least one spring loaded plunger [not shown] for releasing gas from the inlet port (6d) to the outlet port (6e).
  • the secondary gas valve (6b) comprises at least one spring loaded plunger for releasing the gas from the inlet port (6f) to the outlet port (6g), and at least one gas exhaust port (6h) to exhaust the leaked gas.
  • the spring-loaded plunger in the secondary gas valve (6b) operates by either closing the outlet port (6g) or the exhaust port (6h).
  • Exhaust port (6h) is another outlet port of the secondary gas valve (6b), which is used to exhaust the leaked gas.
  • the secondary gas valve (6b) in stationary position does not permit flow of gas to the transformer tank (14) and instead directs the leaking gas to the exhaust gas port (6h) releasing the gas into atmosphere.
  • an external force is required on the secondary spring loaded plunger of the secondary gas valve (6b).
  • the external force is applied through electromechanical device which operates only after receipt of all operating signals from the at least one control unit (1).
  • gas leakage is detected by the secondary gas valve (6b).
  • the secondary gas valve (6b) supplies the gas to the transformer (30) through a non-return valve (37).
  • a pressure regulator (34) [shown in figure 3 ] is configured to the gas source (7) to monitor pressure of gas routed to the transformer tank (14).
  • the pressure regulator (34) is provided with at least one contact manometer (34a) for measuring the gas pressure in the gas source (7) and at least one pressure gauge (34b) for measuring input pressure of the gas being routed to the transformer tank (14).
  • the pressure regulator (34) is also attached with pressure setting knob (34d) operable by an operator to vary the pressure level of the gas being routed in to the primary gas valve (6a). If the input pressure of the gas being routed surpasses predetermined gas injection pressure the pressure setting knob (34d) is used to reduce the pressure. In an embodiment, the predetermined gas injection pressure is above 10 bar.
  • the pressure regulator (34) includes a safety relief valve (34c), to maintain pressure of gas entering the transformer tank (14).
  • the safety valve (34c) relieves pressure of the gas, by discharging gas to the atmosphere until the pressure is within predetermined limit. In an embodiment, the predetermined pressure limit of gas flow is 10 bar.
  • the gas outlet from the safety valve (34c) is routed to the outlet of the secondary valve (6b) via a gas flow control valve (6c).
  • the gas flow control valve (6c) controls the flow rate of the gas to the transformer tank (14). Further, outlet of the gas flow control valve (6c) is connected to an inlet of Non-return valve (37), wherein outlet of the Non-return valve (37) is connected to transformer tank (14).
  • a pressure monitoring switch [PMS] (31) [as shown in figure 4 ] comprises an oil receiving end (31a) [also referred to as pressure port], at least one diaphragm (31b), at least one pressure switch (31c) enclosed in a casing (31d), at least one spring loaded plunger (31e) and a plurality of support plates (31f) which acts as housing for the diaphragm (31b).
  • the pressure port (31a) is connected to the diaphragm (31b) using fastener means and a gasket is provided to avoid oil leakage.
  • the fastener means is a mounting nut.
  • the diaphragm (31b) is attached to the spring-loaded plunger (31e) which is in contact with the pressure switch (31c).
  • the pressure switch (31c) is a Normally Contact (NC) switch.
  • the PMS (31) as shown in figure 5 is in fluid communication with the drain pipe (9).
  • the PMS (31) is positioned between plurality of ball valves (41, 42).
  • the plurality of ball valves (41, 42) are fluidly connected to the drain pipe (9) through first and second hose pipes (43, 44) respectively.
  • the plurality of ball valves (41, 42) are selected from a group such as but not limiting to two-way ball valve and three-way ball valves.
  • both two-way ball valve (41) and three-way ball valve (42) are used for routing oil (11) from the drain pipe (9) to the PMS (31).
  • One opening of the two-way ball valve (41) is connected to the drain pipe (9) for bypassing oil (11) from the drain pipe (9) and other opening of the two-way ball valve (41) is connected to a first opening of the three-way ball valve (42) for receiving the bypassed oil (11).
  • a second opening of the three-way ball valve (42) is connected to an oil receiving end (31a) of the PMS (31) for routing bypassed oil (11) to the PMS (31).
  • the PMS (31) receives the bypassed oil from the three-way ball valve (42) and measures the current static oil pressure.
  • both the two-way ball valve (41) and the three-way ball valve (42) are provided with at least one operating handle/lever.
  • the operating handle is used to regulate the valve condition based on the requirement. For example, as shown in figure 6 , when the lever attached to the two-way ball valve (41) is in horizontal position, then the two-way ball valve (41) is in operating condition/open condition. However, if the position of the two-way ball valve (41) is vertical, it indicates that the two-way ball valve (41) is in closed condition. Further, if the position of the lever attached to the three-way ball (42) valve is vertical, then the three-way valve (42) is said to be in open condition.
  • testing of the system (101) is performed, when both the valves (41, 42) are in closed condition.
  • the valves (41, 42) can be opened and closed manually using the operating handle/lever whenever operator desires to do so.
  • oil (11) is not bypassed to the PMS (31).
  • the PMS (31) senses variation in the oil pressure of the bypassed oil (11) during oil draining activity. As soon as variation in the bypassed oil pressure takes place, the spring-loaded plunger (31e) is depressed which results into change of state of pressure switch (31c) from contact state to non-contact state. Also, the PMS (31) provides a first input signal to the control unit (1), upon detection of variation of pressure of the bypassed oil (11).
  • the preset oil pressure is 68,64 kPa (7 mwc [meter water column]).
  • the PMS (31) of the apparatus (100) provides the first input signal to the control unit (1)
  • the components i.e. the voltage variation detection unit (26a), the over current detection unit (26b), the surge detection unit (18) and the RPRR
  • the one or more circuit breakers (24, 28) provide second input signal, third input signal, fourth input signal and fifth input signal respectively.
  • control unit (1) includes a power supply device (2) for operating the control unit (1) and a selector switch [not shown in figures] for change-over between the modes of operation of the control unit (1).
  • the control unit (1) also includes a plurality of mechanical latch contactor [not shown in figures], with each of the plurality of mechanical contactors interfaced with components of the apparatus (100). That is, the plurality of mechanical contactors are interfaced with each of the differential current and voltage sensing relay (26), the voltage variation detection unit (26a), the over current detection unit (26b), the surge detection unit (18), the rapid pressure rise relay (RPRR) and the one or more circuit breakers (24, 28).
  • the control unit (1) controls the components of the apparatus (100) via the plurality of mechanical contactor.
  • the plurality of the mechanical contactors includes a first contactor, a second contactor, a third contactor, a fourth contactor and a fifth contactor [not shown in figures].
  • the first contactor is interfaced with the voltage variation detection unit (26a).
  • the second contactor is interfaced with the over current detection unit (26b).
  • the third contactor is interfaced with the surge detection unit (18).
  • the fourth contactor is interfaced with the one or more circuit breakers (24, 28).
  • the fifth contactor is interfaced with a cable monitoring system (29).
  • the cable monitoring system (29) interconnects all the components of the apparatus (100) with the plurality of mechanical contactors of the control unit (1), thereby enable the control unit (1) to control operations of the components of the apparatus (100).
  • the control unit (1) also includes a memory unit [not shown in figures] which is configured to store the preset values of the components of the apparatus (100).
  • the memory unit also stores computations required to compute the ratio of input current/voltage with output current/voltage.
  • the memory unit also stores computations required to compute differences between input current/voltage with the output current/voltage.
  • the memory unit is selected from group such as but not limited to RAM, ROM or any other storage device, which serves the purpose of storing the preset values and computations of the components of the apparatus (100).
  • the at least one control unit (1) includes a processing unit [not shown in figures] to process or perform computations based on the input received from the components.
  • the processing unit may comprise at least one data processor for executing program components for executing user- or system-generated requests.
  • the processor may include specialized processing units such as integrated system (bus) controllers, memory management control units, floating point units, graphics processing units, digital signal processing units, etc.
  • the processing unit may include a microprocessor, such as AMD Athlon, Duron or Opteron, ARM's application, embedded or secure processors, IBM PowerPC, Intel's Core, Itanium, Xeon, Celeron or other line of processors, etc.
  • the processing unit may be implemented using mainframe, distributed processor, multi-core, parallel, grid, or other architectures.
  • Some embodiments may utilize embedded technologies like application-specific integrated circuits (ASICs), digital signal processors (DSPs), Field Programmable Gate Arrays (FPGAs), etc.
  • the processing unit may be disposed in communication with one or more input/output (I/O) devices via I/O interface.
  • I/O input/output
  • the I/O interface may employ communication protocols/methods such as, without limitation, audio, analog, digital, monoaural, RCA, stereo, IEEE-1394, serial bus, universal serial bus (USB), infrared, PS/2, BNC, coaxial, component, composite, digital visual interface (DVI), high-definition multimedia interface (HDMI), RF antennas, S-Video, VGA, IEEE 802.n /b/g/n/x, Bluetooth, cellular (e.g., code-division multiple access (CDMA), high-speed packet access (HSPA+), global system for mobile communications (GSM), long-term evolution (LTE), WiMax, or the like), etc.
  • CDMA code-division multiple access
  • HSPA+ high-speed packet access
  • GSM global system for mobile communications
  • LTE long-term evolution
  • WiMax wireless wide area network
  • the control unit (1) upon receipt of either of the input signals from the components, generates a control signal.
  • the control signal operates a drain valve (4) and a gas release valve (6) of the apparatus (100). Operating the drain valve (4) will drain oil (11) from the transformer tank (14), via the drain pipe (9). Simultaneously, the control signal operates the gas release valve (6) as shown in figure 2 , to route gas into the transformer tank (14). (46).
  • gas is supplied to the transformer (30) via the gas release unit (6), whenever the at least one control unit (1) detects possible occurrence of fire and/or explosion in the transformer (30) i.e. receives at least one of the input signals from the components of the transformer (30). Thereby, detecting fire and preventing explosion of the transformer.
  • Figure 7 in one exemplary embodiment of the present disclosure illustrates a system (101) for detecting fluid leakage, fire and preventing explosion of the transformer (30).
  • the system (101) is configured with a fluid leakage detection unit (102) to the apparatus (100).
  • the fluid leakage detection unit (102) in an exemplary configuration is assembled to the drain pipe (9) [as shown in figure 8a ].
  • the fluid leakage detection unit (102) is integrated at bottom portion of the drain pipe (9).
  • the drain pipe (9) is divided into an upper fluid drain pipe (9a) and a lower drain pipe (9b).
  • the upper drain pipe (9a) has one end connected to the transformer tank (14) and the other end connected to inlet port (4a) of the drain valve (4).
  • the lower drain pipe (9b) has one end connected to an outlet port (4b) of the drain valve (4) and the other end of the lower drain pipe (9b) is connected to the top side portion of a fluid collection compartment (3).
  • the drain valve (4) is disposed between the upper drain pipe (9a) and lower drain pipe (9b).
  • the upper drain pipe (9a) and the lower drain pipe (9b) are connected the drain valve (4) using fasteners.
  • the fastener interconnecting the drain pipe (9) and the drain valve (4) are selected from group such as but not limiting to nut, bolts and rivets.
  • the lower drain pipe (9) is configured with an extended diverging portion (9c).
  • the fluid collection compartment (3) is attached to extended diverging portion (9c).
  • the fluid collection compartment (3) is attached to the extended diverging portion (9c), by methods such as but not limiting to welding, soldering, brazing and fastening.
  • the fluid collection compartment (3) is configured to collect oil leaked from the drain pipe (9), when the drain valve (4) is in closed position.
  • the fluid collection compartment (3) has at least one through hole (4) or passageway at each of its top side and bottom sides.
  • the at least one through hole (38) provisioned on top side is connected to the diverging portion (9c) and the at least one through hole provisioned at the bottom side of the compartment (3) is connected to a fluid discharge pipe (32).
  • the drain pipe (9) and the at least one through hole (38) are co-axial. This configuration, enables the oil (11) to directly flow through the at least one through hole (38) to an oil sump (8), via the fluid discharge pipe (32). Further, a drain plug (3b) is configured in the fluid collection compartment (3), to drain the oil (11) collected due to the extended diverging portion (9c).
  • the fluid collection compartment (3) is provided with a fluid collection area (39) [shown in figure 8b ].
  • the fluid collection area (39) is provisioned at bottom of the fluid collection compartment (3).
  • the fluid collection area (39) is an area surrounding the at least one through hole (4) and is configured to collect oil leaked from the drain valve (4).
  • the oil leaked from the drain valve (4) upon reaching the extended diverging portion (9c) loses its pressure due to the divergent portion of the drain pipe (9).
  • the oil (11) flows along the walls of the fluid collection compartment (3) and thereby gets collected in the fluid collection area (39).
  • the fluid collection area (39) is formed by connection of the fluid discharge pipe (32) to the bottom part of the fluid collection compartment (3).
  • the fluid discharge pipe (5) extends up to a predetermined height into the fluid collection compartment (3) through the at least one through hole (38). In an embodiment, the fluid discharge pipe (5), extends up to a predetermined height based on the volume of the fluid collection area (39) required. Also, the extended portion of the fluid discharge pipe (32) into the fluid collection compartment (3) acts as a sidewall to prevent flow of collected oil into the oil sump (8) via the fluid discharge pipe (32).
  • the fluid collection compartment (3) is further provided with at least one fluid level switch (3c).
  • the fluid level switch (3c) is positioned at predetermined location of the fluid collection compartment (3).
  • the fluid level switch (3c) is positioned at one of the corners of bottom portion of the fluid collection compartment (3).
  • at least one cutout (3a) of predetermined size and shape is made to one of the side faces of the fluid collection compartment (3).
  • the shape of the cutout (3a) can be varied which includes but are not limiting to square, rectangular, circle, oval, and any other shape which serves the purpose.
  • the size of the cutout (3a) is configured such that it will enable an operator to reach the fluid level switch (3c).
  • the cutout (3a) also enables the operator to peep into the fluid collection compartment (3).
  • predetermined number of locking holes are formed that surround the cutout (3a) portion.
  • the number of locking holes provisioned to the locking plate (3d) is about 2 to about 10 in number.
  • This configuration of locking plate (3d) prevents draining of oil through the drain pipe (9) and through the cutout (3a).
  • a trigger alarm [not shown] is configured to the fluid leakage detection unit (102), to alert the operator upon detection of fluid leakage in the system (101).
  • the fluid leakage detection unit (102) monitors fluid leakage in the transformer (30).
  • the fluid leakage detection unit (102) is configured to detect leakage of oil (11) in the drain pipe (9), during closed position of drain valve (4).
  • the fluid leakage detection unit (102) detects leakage, when oil (11) collected in the fluid collection compartment (3) surpasses a preset value.
  • the at least one fluid level switch (3c) triggers an alarm to alert the operator of the oil leakage.
  • the pressure of the oil (11) drained from the transformer tank (14) is monitored by the PMS (31).
  • the pressure switch (31c) provides a first input signal to the at least one control unit (1).
  • the voltage variation unit (26a) and the over current detection unit (26b) provides a second input signal and the third input signal to the control unit (1) respectively.
  • a fifth input signal is provided to the control unit (1) by the one or more circuit breakers (24, 28).
  • the fifth input signal is provided to the control unit (1), when the one or more circuit breakers (24, 28) receives signal from either of the voltage variation unit (26a), the over current detection unit (26b), the surge detection unit (18) and the rapid pressure rise relay [RPRR].
  • the at least one control unit (1) Upon receiving either of the first input signal, the second input signal, the third input signal, the fourth input signal and the fifth input signal, the at least one control unit (1) operates the drain valve (4) and the gas release valve (6), simultaneously.
  • the oil (11) in the transformer tank (14) drains out. Due to release of the gas release valve (6), gas from the gas source (7) is routed from bottom portion of the transformer tank (14). Circulation of gas to the bottom portion of the transformer tank (14) swirls the oil (11) present in the transformer tank (14), thereby evenly cooling the oil (11). Also, the swirling of oil (11) due to flow of gas removes oxygen in the transformer tank (14), thereby reducing oxygen content in the transformer tank (14). Also, the gas rises up in the transformer tank (14) and forms an envelope over a crack or rupture occurred to the transformer tank (14). The circulated gas therefore prevents explosion and resulting fire of the transformer (30).
  • control unit (1) receives either of the first input signal, the second input signal, the third input signal and the fourth input signal from the voltage variation unit (26a), the over current detection unit (26b), the surge detection unit (18) and the rapid pressure rise relay [RPRR] and the one or more circuit breakers (24, 28) respectively.
  • the present disclosure provides an apparatus, which is configured to route a gas into the transformer tank from the bottom portion, thereby cooling the oil and eliminating oxygen collection from the transformer tank.
  • the present disclosure provides an apparatus, wherein the gas routed to the transformer tank, is also configured to create an envelope or a layer around cracks or ruptures on the transformer tank, thereby preventing explosion of the transformer.
  • the present disclosure provides an apparatus and a system to detect fluid leakage, thereby inherently preventing issues related to transformer heating and explosion.
  • the present disclosure provides an apparatus and a system to detect fire provides a time interval for the operator to take preventive measure in case of danger of explosion of the transformer.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Housings And Mounting Of Transformers (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Fire-Detection Mechanisms (AREA)
  • Fire Alarms (AREA)
  • Measurement Of Current Or Voltage (AREA)
EP17818613.6A 2017-03-06 2017-10-27 An apparatus for detecting fire and preventing explosion of transformer and a method thereof Active EP3593365B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
HRP20212001TT HRP20212001T1 (hr) 2017-03-06 2017-10-27 Uređaj za detektiranje vatre i sprječavanje eksplozije transformatora i postupak istog

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BD672017 2017-03-06
PCT/IB2017/056679 WO2018162963A1 (en) 2017-03-06 2017-10-27 An apparatus for detecting fire and preventing explosion of transformer and a method thereof

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EP3593365A1 EP3593365A1 (en) 2020-01-15
EP3593365B1 true EP3593365B1 (en) 2021-09-01

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KR (1) KR102472077B1 (uk)
CN (1) CN110582818B (uk)
DK (1) DK3593365T3 (uk)
EA (1) EA039116B1 (uk)
EC (1) ECSP19072475A (uk)
ES (1) ES2905226T3 (uk)
HR (1) HRP20212001T1 (uk)
HU (1) HUE056862T2 (uk)
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PE (1) PE20241404A1 (uk)
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PT (1) PT3593365T (uk)
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CN110582818B (zh) 2022-09-30
DK3593365T3 (da) 2021-12-06
CN110582818A (zh) 2019-12-17
PT3593365T (pt) 2021-12-29
EA201992066A1 (ru) 2020-03-05
KR20190127790A (ko) 2019-11-13
ES2905226T3 (es) 2022-04-07
PE20241404A1 (es) 2024-07-11
EP3593365A1 (en) 2020-01-15
EA039116B1 (ru) 2021-12-07
ECSP19072475A (es) 2019-12-27
PH12019502204A1 (en) 2020-10-05
UA124782C2 (uk) 2021-11-17
KR102472077B1 (ko) 2022-11-28
HUE056862T2 (hu) 2022-03-28
HRP20212001T1 (hr) 2022-04-15
ZA201906353B (en) 2020-09-30
LT3593365T (lt) 2022-01-10
WO2018162963A1 (en) 2018-09-13

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