CN201117559Y

CN201117559Y - SF6 gas density relay

Info

Publication number: CN201117559Y
Application number: CNU2007200926693U
Authority: CN
Inventors: 王普庆; 韩项峰; 韩长运; 尹海兵; 张金岭
Original assignee: Pinggao Group Co Ltd
Current assignee: Henan Pinggao Electric Co Ltd
Priority date: 2007-11-14
Filing date: 2007-11-14
Publication date: 2008-09-17
Anticipated expiration: 2017-11-14

Abstract

The utility model relates to an SF6 gas density relay which is used on high voltage power supply and transformation equipment. The novel SF6 gas density relay includes a mechanical electric contact pressure gauge component which is equipped with a temperature compensation sensor and a terminal box which is connected with a gauge casing. A temperature and pressure detection far-distance transmission device which is communicated with the gas inlet pipe of a gauge joint is installed in the gauge casing. The power line and the signal line of the temperature and pressure detection far-distance transmission device are connected with a terminal in the terminal box. The SF6 gas density relay of the utility model adds a temperature and pressure sensor on the basis of the current density relay, is provided with all functions of the traditional density relay and can output standard 4-20mA current signals or output digital signals through a CAN bus to facilitate the real-time monitoring of a main control room. With the far-distance transmission part composing an independent system which is not interfered with the mechanical part, the SF6 gas density relay of the utility model adds the reliability of the SF6 gas density monitoring and further guarantees the production safety.

Description

A kind of New type of S F 6Gas density relay

One, technical field:

The utility model relates to a kind of gas density relay, especially relates to the SF that uses on a kind of high-tension power transmission and transformation equipment ₆Gas density relay.

Two, background technology:

SF ₆Gas is a kind of good gas insulating material.SF ₆Gas has very high electric insulation intensity, stronger arc extinguishing ability, good heat conductivity and excellent thermal stability, therefore is widely used in high-tension electricity devices such as primary cut-out, lightning arrester, instrument transformer, transformer and pipeline bus as insulation and arc-extinguishing medium.Electric elements are being filled with SF ₆Work in the closed container of gas, SF ₆The density value of gas has direct influence to the electric property of electric elements, particularly insulation and arc extinguishing ability.Therefore, to SF ₆The monitoring of gas density and control are the important research directions of guaranteeing the power equipment safety operation.

Do not leaking ideally the SF in the High-Voltage Electrical Appliances ₆The quality of gas is invariable, and promptly density value is constant.According to the derivation of gas state equation, the function of the density of any gas is that (p, T) value that is to say that density is the function of its pressure (pressure) and temperature to ρ=f in the closed container.Therefore, pre-monitoring density must be considered pressure (pressure) and temperature simultaneously.

At present, generally adopt pointer SF on the high-voltage electrical equipment ₆Gas density relay monitors SF ₆The variation of gas density.In fact this density monitor is exactly a kind of follow-on electro connecting pressure gauge.It mainly is made up of elements such as bourdon tube pressure gauge assembly (comprising joint, Bourdon tube and gear drive etc.), temperature compensating element, electric contact, indicating device (comprising dial and pointer) and terminal boxes.When Bourdon tube because SF ₆Gas varies with temperature and expands with heat and contract with cold when causing the pointer indicated pressure to change, and temperature compensating element then compensates according to this pressure variety of opposite steering handle, the SF under the size of its amount of temperature compensation and the different debugging pressure ₆The p-T curve of gas (being isochor) is relevant, and the adjustment pressure of temperature-compensating during with 20 ℃ is benchmark.Like this, through after the of short duration temperature-compensating process, the position of the rated pressure size the when indicated value of pointer is got back to 20 ℃ basically.Therefore, so-called density is actually the force value after the conversion of actual pressure and compensatory pressure.Work as SF ₆When set point was arrived in gas leakage, indicating device drove electric contact and sends tonifying Qi or block signal.

Along with fail safe, reliability, the non-maintaining property particularly intelligentized requirement of operation of power networks to substation equipment work progressively improves, this density monitor just shows following weak point gradually: 1, can not in real time density value directly be sent to master-control room, for maintenance on duty makes troubles; 2, when variation of ambient temperature, the deformation of temperature compensating element needs certain cycle, can not be synchronous fully, there is certain deviation; 3, the installation site of some density monitor is special, and too high or too dispersion is not easy to attendant's field observation as the installation site; 4, the tour of power station density monitor in service record is very inconvenient.

Three, utility model content:

The utility model proposes a kind of New type of S F at the defective that traditional mechanical formula density monitor can only carry out the measurement and the demonstration of gas on-site density ₆Gas density relay has the remote transfer signal output function, is convenient to realize the real-time centralized monitor to the measurement point of a plurality of dispersions.

The technical scheme that the utility model adopted:

A kind of New type of S F ₆Gas density relay, contain mechanical type electro connecting pressure gauge assembly that has temperature compensating element and the terminal box that is connected with watchcase, the temperature and pressure that is communicated with the gas inlet tube of meter connector is installed in watchcase detects remote transmission device, described temperature and pressure detects the power line of remote transmission device and holding wire and is connected on the binding post in the terminal box.

Described New type of S F ₆Gas density relay, described temperature and pressure detect remote transmission device and comprise temperature and pressure transducer and wiring board, and the temperature and pressure sensor core is by being located on the meter connector and SF ₆What gas inlet tube was communicated with is connected with meter connector with the connector of its coupling, and wiring board is fixed on watchcase inside, and temperature and pressure transducer and wiring board connect by lead, and wiring board is connected in the terminal box by lead.

Described New type of S F ₆Gas density relay, the temperature and pressure transducer can adopt any one in the PC10 series, and the core body of pressure and temperature transducer is communicated with connection with meter connector, by the SF of the handle of the treatment circuit on the wiring board by the temperature and pressure sign ₆The gas density conversion of signals is that the digital signal of standard 4～20mA current signal or CAN bus form is drawn by terminal box.

Useful good effect of the present utility model:

1, the utility model SF ₆Gas density relay, on the basis of existing density monitor, temperature, pressure sensor have been increased, the repertoire that not only possesses traditional density monitor, and can outputting standard 4～20mA current signal or by CAN bus output digital signal, be convenient to master-control room and monitor in real time.

2, the utility model SF ₆Gas density relay, teletransmission are partly formed independently system, do not disturb mutually with mechanical part, have increased SF ₆The reliability of gas density monitoring has further ensured production safety.

Four, description of drawings:

Fig. 1 is the main TV structure schematic diagram of the utility model gas density relay.

Fig. 2 is that the A-A of Fig. 1 is to cutaway view.

Fig. 3 is that the B-B of Fig. 2 is to view.

Five, embodiment:

Embodiment: the utility model SF ₆Gas density relay contains mechanical type electro connecting pressure gauge assembly that has temperature compensating element and the terminal box that is connected with watchcase, itself and existing traditional SF ₆What gas density relay was different is: by the temperature and pressure detection remote transmission device of installing in watchcase and the gas inlet tube of meter connector is communicated with, make it to have the teletransmission function.Wherein temperature and pressure detects remote transmission device and comprises treatment circuit on temperature and pressure transducer and the wiring board, and the temperature and pressure sensor core is by being located on the meter connector and SF ₆What gas inlet tube was communicated with is connected with meter connector with the connector of its coupling, and wiring board is fixed on watchcase inside, and temperature and pressure transducer and wiring board connect by lead, and the power line that wiring board connects is connected the corresponding binding post in the terminal box with holding wire.The temperature and pressure transducer converts the temperature and pressure variation of sensing to the signal of telecommunication and outputs on the wiring board, by the SF of treatment circuit handle by the temperature and pressure sign ₆The gas density conversion of signals is that the digital signal of standard 4～20mA current signal or CAN bus form is drawn out on demonstration in the master-control room or the control instrument by terminal box and shows.

Referring to Fig. 1～Fig. 3.The utility model SF ₆Gas density relay comprises watch crystal 1, lining 2, watch glasses 3, dactylogryposis pin 4, Bourdon tube 5, gear drive (or abbreviating movement as) 6, watchcase 7, wiring board 8 and SF ₆Meter connector 9, pressure and temperature transducer 10, sensor housing 11, pedestal 12, electric contact 13, dial 14, terminal box 15, polyvinyl chloride insulation lead 16, temperature compensating element 17 that gas medium connects.Wherein temperature compensating element 17 1 ends are connected on the Bourdon tube 5, and the other end and movement 6 link together; Watch crystal 1, lining 2 are fixed on the watchcase 7 by watch glasses 3, and terminal box 15 also fixes with watchcase 7.Meter connector 9 is welded as a whole with watchcase 7, and Bourdon tube 5 is communicated with meter connector, and movement 6, wiring board 8, pedestal 12 all are fixed on the meter connector 9, and dactylogryposis pin 4 is fixed on the movement 6.The temperature and pressure transducer can adopt any one in the PC10 series, and temperature and pressure transducer 10 is fixed on the sensor housing 11, and sensor housing 11 is fixed on the meter connector 9, and sensor core is communicated with installation with meter connector.

The principles illustrated of mechanical part of the present utility model is as follows: when density monitor by meter connector 9 with have the specified SF of determining ₆The SF of gas pressure (20 ℃) ₆When High-Voltage Electrical Appliances link together, SF ₆Gas enters Bourdon tube 5 inside by meter connector 9, causes the micro-displacement of Bourdon tube 5, and this displacement is delivered on the movement 6 by temperature compensating element 17 amplifies, and indicates on dial 14 by dactylogryposis pin 4.When temperature was 20 ℃, the indicated value of dactylogryposis pin 4 on dial 14 just in time was specified SF ₆Gas pressure value.When temperature during greater than 20 ℃, SF ₆Gas expands, pressure raises, and the value of dactylogryposis pin 4 indications on dial 14 also increases, but temperature compensating element 17 produces deformation under action of high temperature, changing in the opposite direction of the direction of this deformation and Bourdon tube 5 consequently makes dactylogryposis pin 4 be indicated to specified SF on the dial 14 again ₆The position of gas pressure.When temperature reduced, principle was identical therewith.When gas leakage was arrived to a certain degree, temperature compensating element 17 can not compensate to the rated pressure value, and dactylogryposis pin 4 drives electric contacts 13 rotations and also sends signal, and signal is connected on the terminal box 15 by lead 16.

The utility model SF ₆Gas density relay is by meter connector 9 and have the specified SF of determining ₆The SF of gas pressure (20 ℃) ₆When High-Voltage Electrical Appliances link together, SF ₆Gas enters in the Bourdon tube 5 from meter connector 9, contacts with temperature and pressure transducer 10 by sensor housing 11 simultaneously.Temperature and pressure transducer 10 and SF ₆The gas contact, the variation of temperature and pressure is exported with the form of the signal of telecommunication, be transferred on the wiring board by lead 16, after the processing of circuit data are converted to the digital signal of standard 4～20mA current signal or CAN bus form, be connected on the terminal box 15 by lead 16 again, will be with the SF of temperature and pressure characterization ₆The gas density value changes the standard electric signal into and outputs on the Displaying Meter and show.

Claims

1, a kind of New type of S F ₆Gas density relay, contain mechanical type electro connecting pressure gauge assembly that has temperature compensating element and the terminal box that is connected with watchcase, it is characterized in that: the temperature and pressure that is communicated with the gas inlet tube of meter connector is installed in watchcase detects remote transmission device, described temperature and pressure detects the power line of remote transmission device and holding wire and is connected on the binding post in the terminal box.

2, New type of S F according to claim 1 ₆Gas density relay is characterized in that: described temperature and pressure detects remote transmission device and comprises temperature and pressure transducer and wiring board, and the temperature and pressure sensor core is by being located on the meter connector and SF ₆What gas inlet tube was communicated with is connected with meter connector with the connector of its coupling, and wiring board is fixed on watchcase inside, and temperature and pressure transducer and wiring board connect by lead, and wiring board is connected in the terminal box by lead.

3, New type of S F according to claim 1 and 2 ₆Gas density relay is characterized in that: the temperature and pressure transducer adopts any one in the PC10 series, and the core body of pressure and temperature transducer is communicated with connection with meter connector, by the SF of the handle of the treatment circuit on the wiring board by the temperature and pressure sign ₆The gas density conversion of signals is that the digital signal of standard 4～20mA current signal or CAN bus form is drawn by terminal box.