RKF-3/1-M1
The block of the relay of control of the phases RKF-3/1-M1 is intended for control of tension of a three-phase network and protection of the equipment, in structure which three-phase engines, three-phase power supplies enter direct current and other loadings sensitive to changes three-phase tension.
Provides shutdown of three-phase loadings in case of "break" of a phase, violations of alternation of phases, strong fluctuations of the feeding tension on phases, at accident of a network.
Warranty period – 2 years.
Design of system
The block of the relay of control of the phases RKF-3/1-M1 is executed in the case (4 mode) for installation on a DIN lath.
On the forward panel of the block there are handles of regulators of installation of an operating mode of the relay and indicators of a condition of a network. On the front panel of the module there are indication light-emitting diodes.
Indication normal work "Network" and "Relay", indication of the wrong alternation phases or "break" of the phases "L2", "L3", the level of phase tension in comparison with threshold values «>U», «<U». Threshold values of tension:
Temporary parameters of delays of switching - «Δtв», «Δtн»., are adjusted by the user depending on character of loading. Are necessary for localization of influence of transition processes when switching loadings.
Note 1: at installation of the module on a "weak" network (at inclusion of loading strong power failure is observed) and incorrect settings cycling when switching is possible.
For example: «Uвп» = 250 V, «Ul t» = 200 V, «ΔUl t» = 5 V, «tвозвр» = 5 min, «tоткл» = 2 s, «tturn on» = 1 s
Tension on the first phase with which loading eats, falls lower than 200 V, MVF (according to the established lower threshold 200 V) disconnects loading. At it as it is unloaded, tension rises, suppose, on 10 V and it will be 210 V. As hysteresis of the lower threshold of shutdown it is adjusted on 5 V, there will be the return inclusion of loading and at connection of loading tension again will fall out of limits of 200 V, etc. For avoidance of this cycle it is necessary to adjust a hysteresis of the lower threshold on 15 V.
Thus, for ensuring correct work of system protection it is necessary to show consideration for control and for definition hysteresis of the lower threshold of shutdown to make falling measurement tension at inclusion of loading. The size of a hysteresis has to be on 3–5 V are more than tension of sag of a network.
Unlike the majority import and domestic relays of control of phases, at which hysteresis the lower threshold of shutdown is constant and makes 5–7 V, this the device has adjustable control from 5 to 20 V that allows to avoid cycling in "weak" networks and respectively to avoid accident.
Relay of the phases RKF-3/1-M1 of control has rather powerful exit of management that allows without installation intermediate relays to work with contactors on loadings to 200 kVA.
Technical characteristics
Adjustable settings
.
The block of the relay of control of the phases RKF-3/1-M1 is executed in the case (4 mode) for installation on a DIN lath.
On the forward panel of the block there are handles of regulators of installation of an operating mode of the relay and indicators of a condition of a network. On the front panel of the module there are indication light-emitting diodes.
Indication normal work "Network" and "Relay", indication of the wrong alternation phases or "break" of the phases "L2", "L3", the level of phase tension in comparison with threshold values «>U», «<U». Threshold values of tension:
- «>U» top threshold of shutdown;
- «<U » lower threshold of shutdown;
- «Δ<U» hysteresis of the lower threshold;
- Umax–Umin phases distortion
Temporary parameters of delays of switching - «Δtв», «Δtн»., are adjusted by the user depending on character of loading. Are necessary for localization of influence of transition processes when switching loadings.
Note 1: at installation of the module on a "weak" network (at inclusion of loading strong power failure is observed) and incorrect settings cycling when switching is possible.
For example: «Uвп» = 250 V, «Ul t» = 200 V, «ΔUl t» = 5 V, «tвозвр» = 5 min, «tоткл» = 2 s, «tturn on» = 1 s
Tension on the first phase with which loading eats, falls lower than 200 V, MVF (according to the established lower threshold 200 V) disconnects loading. At it as it is unloaded, tension rises, suppose, on 10 V and it will be 210 V. As hysteresis of the lower threshold of shutdown it is adjusted on 5 V, there will be the return inclusion of loading and at connection of loading tension again will fall out of limits of 200 V, etc. For avoidance of this cycle it is necessary to adjust a hysteresis of the lower threshold on 15 V.
Thus, for ensuring correct work of system protection it is necessary to show consideration for control and for definition hysteresis of the lower threshold of shutdown to make falling measurement tension at inclusion of loading. The size of a hysteresis has to be on 3–5 V are more than tension of sag of a network.
Unlike the majority import and domestic relays of control of phases, at which hysteresis the lower threshold of shutdown is constant and makes 5–7 V, this the device has adjustable control from 5 to 20 V that allows to avoid cycling in "weak" networks and respectively to avoid accident.
Relay of the phases RKF-3/1-M1 of control has rather powerful exit of management that allows without installation intermediate relays to work with contactors on loadings to 200 kVA.
Technical characteristics
| Parameter |
Value |
| Rated working voltage | 380/220 V; 50 Hz |
| The switched contact current (AC1 of 250 V) 2 exits, max |
7А |
| Overall dimensions of the block | 70х90х60 mm |
| Weight, no more | 0,4 kg |
Adjustable settings
| Parameter | Value |
| Top threshold of shutdown of the relay «>U» min/max | 230/270 V |
| Lower threshold of shutdown of the relay «<U» min/max | 150/200 V |
| Phases distortion Umax-Umin min/max | 10/100 V |
| Hysteresis of the lower threshold «Δ<U» min/max | 5/20 В |
| Temporary delay of shutdown of the relay on the top threshold «Δttop(s)» min/max | 0/3 s |
| Temporary delay of shutdown of the relay on the lower threshold «Δtlow(c)» min/max | 0/10 s |
| Hysteresis of the top threshold | 3 V |
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