JFY-11,12,13 type negative sequence voltage relayDetailed product description：

JFY-11、 12. The 13 negative sequence voltage relay is used in the relay protection circuit of generators and transformers as a voltage blocking element to reflect the negative sequence component of voltage during asymmetric short circuits.

Relay model name:



Working Principle:
The relay is set with a dial switch, which is convenient and intuitive. The principle diagram is as follows (see Figure 1):



Usage:
Users can easily grasp the usage of the relay based on the back wiring diagram (i.e. Figure 2) and schematic diagram provided on the relay panel.
The green LED used to indicate the power supply on the panel after connecting the DC power supply to terminals 1 and 9 is illuminated. The action value of the relay is set by the dial switch on the panel, and negative sequence voltage is added. The setting value on the dial is the negative sequence voltage action value, with a setting range of 3-15V. After the relay is activated, the red LED on the panel lights up.

Main technical parameters:
7.1 Rated Value
a) Rated AC voltage: 100V, 50Hz.
b) Rated auxiliary DC voltage: 48V, 110V, 220V.
7.2 Operating range of auxiliary DC voltage
The rated value is (80% -110%) at 110V and 220V;
The rated value is (90% -110%) at 48V.
7.3 Action voltage setting value Negative sequence line voltage setting value range: 3V-15V, with a step difference of 0.1V.
7.4 The setting error of the action voltage shall not exceed 5% under the reference conditions, and the consistency of the action shall not exceed 5%.
When the action time is twice the set value, the relay action time shall not exceed 15ms.
The return coefficient of the 7.6 return coefficient relay shall not be less than 0.9.
7.7 Power consumption
7.7.1 Under rated voltage, the power consumption of the AC voltage circuit shall not exceed 1VA/phase.
7.7.2 Under rated voltage, the power consumption of the DC circuit shall not exceed the specifications in Table 1.
7.8 Contact breaking capacity
a) DC circuit:
Under the conditions of a current not exceeding 2A and a voltage not exceeding 250V, a DC inductive load of 50W can be disconnected with a time constant of 5ms ± 0.75ms for the output contact;
b) AC circuit: Under the conditions of current not exceeding 1A and voltage not exceeding 250V, the output contact can disconnect a circuit load of 250VA with a power factor coso of 0.4 ± 0.1.
7.9 Dielectric Strength
Each conductive circuit of the relay should be able to withstand an AC test voltage of 2kV (effective value), 50Hz between exposed non charged metal parts and casings, between input circuit contacts, and between different circuits for 1 minute without insulation breakdown or flashover.
7.10 Working conditions
a) The usage location does not allow explosive media, and the surrounding media should not contain corrosive metals, gases that damage insulation, or conductive media. It is not allowed to be filled with water vapor or have serious mold presence;
b) Strong vibrations and impacts are not allowed in the usage location;
c) The usage location should have facilities to defend against rain, snow, wind, and sand;
d) The usage location does not allow an external magnetic induction intensity exceeding 1.5mT.
7.11 Electrical anti-interference
Relays shall comply with GB7261 and GB6261 "Electrical anti-interference test for emergency protection devices of static relays".



Wiring diagram behind the relay:




Relay external dimensions and opening dimensions:
The relay is based on a static principle and features a protruding plug-in structure. The external dimensions and installation dimensions of JK-2 are shown in Figure 4 of the universal structural system, JK-1 is shown in Figure 3 of the universal structural system, and the embedded plug-in structure is shown in Figure 7 of the universal structural system.

Ordering instructions:
8.1 Product model, name, structural form, etc.
8.2 Order Quantity.
8.3 Auxiliary power supply voltage level.

JFY-11,12,13 type negative sequence voltage relay（No image available）